Hong Kong, China

The Hong Kong Polytechnic University is a public university located in Hung Hom, Hong Kong. The history of PolyU can be traced back to 1937, and it assumed full university status in 1994. It is one of the funded institutions of the territory's University Grants Committee .PolyU has an international faculty and student community and has developed a global network with more than 440 institutions in 47 countries and regions. PolyU offers 220 postgraduate, undergraduate and sub-degree programmes for more than 32,000 students every year. It is the largest UGC-funded tertiary institution in terms of number of students. Wikipedia.


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Patent
Hong Kong Polytechnic University and McGill University | Date: 2016-10-18

A triazole bridged flavonoid dimer compound library was efficiently constructed via the cycloaddition reaction of a series of flavonoid-containing azides (Az 1-15) and alkynes (Ac 1-17). These triazole bridged flavonoid dimers and their precursor alkyne- and azide-containing flavonoids were screened for their ability to modulate multidrug resistance (MDR) in P-gp-overexpressed cell line (LCC6MDR), MRP1-overexpressed cell line (2008/MRP1) and BCRP-overexpressed cell line (HEK293/R2 and MCF7-MX100). Generally, they displayed very promising MDR reversal activity against P-gp-, MRP1- and BCRP-mediated drug resistance. Moreover, they showed different levels of selectivity for various transporters. Overall, they can be divided into mono-selective, dual-selective and multi-selective modulators for the P-gp, MRP1 and BCRP transporters. The EC_(50 )values for reversing paclitaxel resistance (141-340 nM) of LCC6MDR cells, DOX (78-590 nM) and vincristine (82-550 nM) resistance of 2008/MRP1 cells and topotecan resistance (0.9-135 nM) of HEK293/R2 and MCF7-MX100 cells were at nanomolar range. Importantly, a number of compounds displayed EC_(50 )at or below 10 nM in BCRP-overexpressed cell lines, indicating that these bivalent triazoles more selectively inhibit BCRP transporter than the P-gp and MRP1 transporters. Most of the dimers are notably safe MDR chemosensitizers as indicated by their high therapeutic index values.


Chan Z.C.Y.,Hong Kong Polytechnic University
International Journal on Disability and Human Development | Year: 2017

This study explored students' perspectives on the abilities acquired through a subject called Health Management and Social Care (HMSC), which was launched under Hong Kong's new senior secondary curriculum. The first public examination for the subject was conducted in 2012. A qualitative design was adopted in the present study, with focus group interviews carried out with 123 students recruited from seven schools. Two major themes were identified via content analysis: (i) critical thinking and creativity in HMSC; and (ii) applications of critical thinking and creativity in HMSC with two subthemes (a) health/social care promotions on campus and (b) social services in communities. Both the implications and limitations of the study for health-related subjects were discussed. © 2017 Walter de Gruyter GmbH, Berlin/Boston.


Chan Z.C.Y.,Hong Kong Polytechnic University
International Journal on Disability and Human Development | Year: 2017

Problem-based learning (PBL) is a teaching and learning approach that is widely used in healthcare education. It has similarly been suggested that poetry writing offers students a way to express their feelings and emotions related to clinical issues, medical education, and their relationship with patients. The rhythmic structure and temporal organisation of poetry allow students to remember poetry more easily than prose, suggesting that important and detailed information could be better memorised through poetic text. To report on how poetry writing and reciting was used in a PBL class in nursing to enhance the students' artistic ability, and on the students' perspectives on artistry in their learning. This paper presented a part of results of a main educational study where data were collected through lesson observations, reflective notes, and a follow-up interview. A total of 17 Hong Kong students were encouraged to collaborate in groups and write English poems based on a clinical case. A content analysis was conducted on their reflective notes and narratives were extracted from an interview. Although the students learned about cooperation, creativity, thinking, stress management, how to make lively presentations, deep learning, long-term memory, and professional knowledge, they expressed that the above were indirectly related to artistry. Scholars from the fields of both health related disciplines and literature should collaborate in researching and developing some learning and teaching activities which can further enhance the students' artistic ability so as to let them learn about empathy and understand patients' sufferings and illness experiences. © 2017 Walter de Gruyter GmbH, Berlin/Boston.


Cheng K.W.E.,Hong Kong Polytechnic University
2016 International Symposium on Electrical Engineering, ISEE 2016 | Year: 2016

Energy storage is getting more important because of the demand in energy usage for green application. Electric vehicle, hybrid electric vehicle and electric vessel are rapidly emerged and represent new mobility to be developed for this century. To enable such development, good energy storage devices besides battery and super-capacitor are needed seriously. New battery management system, balancing skill and switched-capacitor techniques are examined for applications in this paper. DC power conversion has great benefit and will be an alternative design for smart city to give direct power. Even the electric vehicle will be based on all electric direct drive to eliminate the mechanical subsystem including transmission and bulky suspension. IN this paper, different types of power conversion are described for future mobility and smart city. © 2016 IEEE.


Keel S.,University of Basel | Schoeb V.,Hong Kong Polytechnic University
Communication and Medicine | Year: 2016

To enhance the patient's involvement, clinical guidelines on rehabilitation require the patient's participation in the entire rehabilitation process, including discharge planning (DP). However, very little is known about how this institutional demand is actually dealt with in everyday clinical practice. Adopting a conversation analytic (CA) approach, our paper tackles the matter by looking at interdisciplinary entry meetings (IEMs) at a rehabilitation clinic in German-speaking Switzerland. Our study is based on audio-visual recordings of 11 IEMs, whose central aim is to formulate patients' rehabilitation goals and to plan their discharge. The paper offers a detailed analysis of the embodied practices through which healthcare professionals seek to involve patients in the IEMs, and also investigates patients' responses. Our analysis shows that, although carefully elaborated, the professionals' practices do not elicit more than reactive patient participation. The paper argues that this is due to (1) the practices' temporal positioning within the overall activity structure of the meeting - they are deployed when no important decision is at stake, projecting minimal patient participation on the phases in which decisions are taken - and (2) the actions the practices project on the next turn: confirmation, acknowledgement or ratification of what has previously been proposed by professionals. © Copyright 2017 Equinox Publishing Ltd.


Shen M.H.,Hong Kong Polytechnic University | Chung K.F.,Hong Kong Polytechnic University
Journal of Constructional Steel Research | Year: 2017

In order to investigate structural behaviour of stud shear connections with both solid and composite slabs under combined shear and tension forces, a systematic experimental investigation with a total of six test series are conducted. These include 11 standard push-out tests where the shear connections are under shear forces, and 11 modified push-out tests where the shear connections are under combined shear and tension forces. It should be noted that the testing method of the standard push-out tests recommended in EN 1994-1-1 is adopted, and headed shear studs are installed in either “favourable” or “unfavourable” positions of decking troughs. Test results of all the 22 push-out tests are fully presented, and these include typical modes of failure, measured load-slippage curves as well as shear resistances of the test specimens. It is found that the shear resistance of the shear connection should be reduced with a factor of 0.84 for the case of a solid concrete slab, and a factor of 0.75 for the case of a composite slab, provided that the tension force Tn is smaller than or equal to 0.267 Qm where Qm is the shear resistance of the shear connection. These data will be adopted in subsequent numerical investigations for calibration of advanced finite element models. These models will then be used to perform parametric studies on stud shear connections with a wide range of geometrical configurations and loading conditions to provide additional data for formulation of design rules. © 2017


Huang B.,Hong Kong Polytechnic University
Physical Chemistry Chemical Physics | Year: 2017

The conventional linear response overestimates the U in DFT+U calculations for solids with fully occupied orbitals. Here, we demonstrate that the challenge arises from the incomplete cancellation of the electron-electron Coulomb repulsion energy under external perturbation. We applied the second charge response, denoted as the "pseudo-charge" model, to offset such residue effects. Counteracting between these two charge response-induced Coulomb potentials, the U parameters are self-consistently obtained by fulfilling the conditions for minimizing the non-Koopmans energy. Moreover, the pseudo-charge-induced repulsive potential shows a screening behavior related to the orbital occupation and is potentially in compliance with the screened exact exchange-correlation of electrons. The resultant U parameters are self-consistent solutions for improved band structure calculations by the DFT+U method. This work extends the validity of the linear response method to both partially and fully occupied orbitals and gives a reference for estimating the Hubbard U parameter prior to other advanced methods. The U parameters were determined in a transferability test using both PBE and hybrid density functional methods, and the results showed that this method is independent of the functional. The electronic structures determined from the hybrid-DFT+Uhybrid approach are provided. Comparisons are also made with the recently developed self-consistent hybrid-DFT+Uw method. © the Owner Societies 2017.


Law R.,Hong Kong Polytechnic University
Tourism Recreation Research | Year: 2017

Publications on rankings are often found in journals from various fields, including tourism and hospitality. A few scholars have written articles that include league tables for ranking individual researchers, apart from research papers, on their theoretical or methodological contributions. These articles rank the most prolific or top-cited authors on a list based on the publication or citation frequency of individuals in a set of selected journals and within a specific time period. The current research note critiques the usefulness (or uselessness) of publications on ranking individuals. © 2017 Informa UK Limited, trading as Taylor & Francis Group


Eric C.K.-W.,Hong Kong Polytechnic University | Yu Z.,Hong Kong Polytechnic University
International Journal of Mechanical Engineering and Robotics Research | Year: 2017

Magnetic shielding is an important design for all electrical system. This is especially important to today's electric mobility because nearly all traction drives are using electric motor and they are driven by high frequency carrier wave from 1kHz to 100kHz. The interference to the signal system of vehicle control unit should cost a damaging effect. Besides the use of filter of metal shielding, a new plastic based magnetic shielding technique is introduced that provides a flexible shielding for the EMI isolation. The new material is especially useful for transportation system because they are light weight, non-brittle, lower cost and prominent performance in high frequency. © 2017 Int. J. Mech. Eng. Rob. Res.


Wu Y.,Hong Kong Polytechnic University | Niu J.,Hong Kong Polytechnic University
Building and Environment | Year: 2017

This study aims at further investigating the respiratory infectious diseases transmission in typical high-rise residential (HRR) environments, and at developing reliable CFD modeling method. The inter-building dispersion under wind effect was focused on and the cross-infection risk was assessed. The URANS model and DES model were compared, and the representation of surroundings was evaluated to improve the prediction of airflow and pollutant dispersion among a group of buildings. The DES model can better reproduce unsteady fluctuations of airflow around the buildings, and can accurately predict the frequency of vortex shedding. The predicted Strouhal number is approximately 0.15, which is consistent with the reported value in literature, whereas the URANS model fails to reproduce the whole features of unsteady airflow and significantly under-estimates the vortex shedding frequency. Ignoring the surrounding buildings in the simulation will significantly over-estimate the downward dispersion and over-estimate the risks in lower heights. The tracer gas concentrations near the downstream buildings are four orders lower than the concentration in the index/source unit, but only one order lower than the concentration in the leeward side and on the roof of the index building, and therefore the risk is comparable to that of intra-building dispersion within the index building. The tracer gas can diffuse to a long distance with slow concentration decay in empty areas. The cross-infection risk of inter-building dispersion should not be overlooked, especially when a super infector with high pathogen generation rate exists. © 2017 Elsevier Ltd


Wang Q.,Hong Kong Polytechnic University | Niu S.,Hong Kong Polytechnic University
Renewable and Sustainable Energy Reviews | Year: 2017

Flux-controllable machines have attracted much attention in modern industry, especially in electric vehicle propulsion and wind power generation, as they can ensure a wide constant power speed range when working at motoring mode, while maintain constant induced voltage when working at generating mode. This paper reviews the current research work about flux-controllable machines, mainly focused on electrically excited machines, hybrid excited machines and memory machines. The latest novel machine concepts with the potential of good flux controllability are particularly investigated. The working principle, advantages and drawbacks, and future trends of different flux-controllable machines are discussed, compared and summarized in detail. © 2016 Elsevier Ltd


Recktenwald D.,Hong Kong Polytechnic University
Journal of Pragmatics | Year: 2017

Online live streaming is a new media genre that combines the broadcast of an activity with cross-modal video-mediated communication. Lacking an analytical entry point, descriptions and micro-level analysis of this type of interaction are rare. Using the case of online live streaming of video games, this paper asks two questions. First, how should a transcript look like in order to systematically account for the activity and the cross-modal communication between broadcaster and audience? Secondly, how does the unfolding of the activity influence the cross-modal discourse during online live streaming? In answering the first question, this paper develops a multi-column transcription scheme, which includes the broadcaster's spoken language & embodied conduct, the audience's written chat messages as well as an annotation of game events. It is argued that the basic principles of this format are applicable to other forms of live streaming and research questions. Afterwards, the transcript is used for exemplary analysis to address the second question. It will be demonstrated that broadcasters are more tightly regulated by the unfolding of the activity than the audience and that this leads to different cross-modal communicative practices. The numerous audience members write quick and brief single-turn messages, whereas the broadcasters are selective and produce fewer but more elaborate responses that span several utterances. Lastly, the paper introduces 'pivoting' and argues that it is a novel communicative behavior typical for online live streaming. Based on a second analysis, the paper will show that game events elicit pivoting utterances or messages from the broadcaster and audience, which attribute a highly contextual and locally negotiated meaning to the event. © 2017 Elsevier B.V.


Why would people feel the need to disclose their negative emotions? Using the theory of conservation of resources, we hypothesize disclosure intention and behavior would be influenced by duration and severity of the negative emotional state. Moreover, we predict the effect of unexpected events and “the Big Five” personality traits on disclosure intention. Besides disclosure intention, we also tapped if the respondents have disclosed their negative emotions on their Facebook profile. In this study, we surveyed 255 Facebook users on their experiences from negative life events under four categories – social relationship, work, health and monetary issues. The results support all of our hypotheses. In particular, our post-hoc analyses show differences between females and males on the influence mechanism behind their disclosure intention. Females are more likely to disclose their problems relating to social relationship, work and health problems on Facebook than males. © 2017 Elsevier Ltd


Zhao W.,Hong Kong Polytechnic University | Ding F.,Hong Kong Polytechnic University
Nanoscale | Year: 2017

Phase transitions between semiconducting 2H and metallic 1T (or 1T′) molybdenum disulphides (MoS2) are explored comprehensively by first-principles calculations. The nucleation of a 1T (or 1T′) nucleus in a 2H MoS2 lattice, the formation of the 2H-1T (1T′) interfaces and the kinetics of interface propagation during phase transition were thoroughly investigated in this study. It was found that, among various potential interface structures between the two phases, Mo-rich and two S-rich zigzag (ZZ) boundaries are energetically more preferable than others. Therefore, triangular or hexagonal 1T MoS2 domains with the three types of ZZ boundaries are expected to be the equilibrium structures of the 1T nucleus in a 2H lattice. Further exploration reveals a very high nucleation energy of the 1T phase which suggests that the nucleation may start from a defect site or the edge of the 2H phase. Besides, the kinetics of 2H-1T (1T′) boundary propagation show that the growth rate of the ZZ boundaries is significantly slower than the armchair (AC) ones'. Therefore, the ZZ-boundary dominated domains are expected to be observed during the growth of the 1T phase while the rounded domains with various high-index edges are expected to be seen throughout shrinkage. This study reveals both the energetics and the kinetics of the phase transition of transition metal dichalcogenide materials and also sheds light on other 2D materials. © The Royal Society of Chemistry.


Yi W.,Hong Kong Polytechnic University | Zhao Y.,Hong Kong Polytechnic University | Chan A.P.C.,Hong Kong Polytechnic University
International Journal of Industrial Ergonomics | Year: 2017

Background Workers are vulnerable to heat stress when they perform tasks in hot environments. Personal cooling systems (PCSs) are designed to reduce heat strain. A cooling vest with ventilation fans is a type of PCS that can blow air around the body to facilitate convective and evaporative cooling. Objective This study aims to evaluate the performance of a ventilation unit for a tailor-made cooling vest designed to protect construction workers from heat stress. The performance of this newly designed ventilation unit (Unit B) was compared with that of the ventilation unit used in a commercially available cooling vest (Unit A). Method The designed ventilation unit consists of a pair of ventilation fans and a portable battery pack. A hot wire anemometer was used to measure the air flow rate of the fan. The air flow rate and work duration of different ventilation units were compared. The sweating manikin test was conducted to further compare the cooling powers of the ventilation units. Result Compared with Unit A powered by the alkaline AA battery (6 V, 2122 mAh), Unit B powered by the rechargeable lithium-polymer (Li-Po) battery (7.4 V, 4400 mAh) achieved a higher air flow rate (8–22 L/s vs. 0–13 L/s) and longer work duration (7.05 h vs. 6.22 h). The average cooling power of Unit B on the sweating manikin was 68 W, which was higher than that of Unit A (51 W). Practical applications Results showed that the newly designed ventilation unit exhibited higher air flow rate and cooling power. The ventilation unit designed in this study will be incorporated into a tailor-made PCS for protecting workers in the heat. © 2017 Elsevier B.V.


Cho P.,Hong Kong Polytechnic University | Cheung S.-W.,Hong Kong Polytechnic University
Investigative Ophthalmology and Visual Science | Year: 2017

PURPOSE. To determine the relative risk of rapid progression and number needed to treat (NNT) in younger and older children using combined data from the retardation of myopia in orthokeratology (ROMIO) and toric orthokeratology–slowing eye elongation (TO-SEE) studies. METHODS. Data from 136 subjects of two studies, ROMIO and TO-SEE, were retrieved (72 orthokeratology [ortho-k]: 37 ROMIO, 35 TO-SEE; 64 control: 41 ROMIO, 23 TO-SEE) and the myopia control effect on younger (6–8 years) and older (9–12 years) subjects evaluated. The rate of axial elongation was classified as not rapid (axial elongation = <0.36 mm/year) or rapid (axial elongation >0.36 mm/year). RESULTS. Cumulative frequency curves showed that the younger subjects in the control group had the greatest and most rapid axial elongation at the end of 24 months. In the younger subjects, ortho-k lens wear significantly reduced the risk of rapid progression by 88.8% (P = 0.002). The 2-year NNT for the younger ortho-k subgroup was 1.8, suggesting that treating just two younger subjects with ortho-k would prevent one subject from experiencing rapid progression over a 2-year period of treatment. The 2-year NNT for the older ortho-k subgroup was 11.8, which was statistically insignificant (P = 0.197). CONCLUSIONS. Orthokeratology significantly reduced risk of rapid progression in younger subjects. Treating just two 6- to 8-year-old subjects with ortho-k instead of single-vision spectacles could prevent one subject from developing rapidly progressing axial elongation during this critical 2-year period. © 2017 The Authors.


Huang Y.,Hong Kong Polytechnic University | Niu J.-L.,Hong Kong Polytechnic University
Refrigeration Science and Technology | Year: 2015

To achieve a more comfortable indoor environment while still retaining low energy consumption level is an exciting challenge for building designers and owners. In this paper, a silica-aerogel filled super-insulating glazing system was proposed. A simulation study was conducted to analyse the energy performance of the proposed glazing system. EnergyPlus was applied in the simulation study. In the study of the energy performance, three control strategies (space temperature control, operative temperature control and PMV control) were applied to simulate the occupant's control behaviour toward the air-conditioning system in reality. The result indicated that compared with conventional single clear glazing, the silica aerogel glazing could retain a 4% longer thermally comfort period, while the energy consumption of HVAC system was reduced by 4% to 7%. It is also concluded that as the occupant's request on thermal comfort got stricter, the performance of the silica aerogel glazing would became better.


Chau K.-W.,Hong Kong Polytechnic University
Water (Switzerland) | Year: 2017

Each year, extreme floods, which appear to be occurring more frequently in recent years (owing to climate change), lead to enormous economic damage and human suffering around the world. It is therefore imperative to be able to accurately predict both the occurrence time and magnitude of peak discharge in advance of an impending flood event. The use of meta-heuristic techniques in rainfall-runoffmodeling is a growing field of endeavor in water resources management. These techniques can be used to calibrate data-driven rainfall-runoffmodels to improve forecasting accuracies. This Special Issue of the journal Water is designed to fill the analytical void by including papers concerning advances in the contemporary use of meta-heuristic techniques in rainfall-runoffmodeling. The information and analyses can contribute to the development and implementation of effective hydrological predictions, and thus, of appropriate precautionary measures. © 2017 by the authors.


He Y.,Hong Kong Polytechnic University
Proceedings of the 30th Pacific Asia Conference on Language, Information and Computation, PACLIC 2016 | Year: 2016

This paper proposes a new methodology in investigating the semantic and pragmatic properties of SFPs in Mandarin Chinese. A case study of the interaction and correlation between SFP-Ne and SpOAs-Shenzhi, Qishi, and Nanguai has been conducted. Two seman-tic features of [+unexpectedness] and [+intersubjectivity] have been summarized on SFP-Ne.


Huang C.-R.,Hong Kong Polytechnic University
Proceedings of the 30th Pacific Asia Conference on Language, Information and Computation, PACLIC 2016 | Year: 2016

Modern ontology focuses on the shared structure of knowledge representation and sheds light on underling motivations of human conceptual structure. This paper addresses the issue of whether ontological structures are linguistically represented, and whether such conceptual underpinning of linguistic representation may motivate language variations. Integrating our recent work showing that the most fundamental endurant vs. perdurant ontological dichotomy is grammaticalized in Chinese and on comparable corpus based studies of variations of Chinese, I will explore the possibilit ENGLy that this basic conceptual dichotomy may in fact provide the motivation of changes of perspectives that underlies language variations. I will also discuss possible implication this approach has in accounting for other language changes and variations such as light verb's argument taking, incorporation, loss of case/agreement, and English -er/-ee asymmetry. In the process, the will resolve three linguistic puzzles and eventually show that the endurant/perdurant dichotomy may in fact be the conceptual basis of the hitherto undefined +N (i.e. nouny) vs. +V (i.e. verby) features prevalent in linguistics. Based on this proposal, the variations involving various types of denominalization and deverbalization can be accounted for.


Lee P.H.,Hong Kong Polytechnic University
Research Quarterly for Exercise and Sport | Year: 2017

Purpose: Some confounders are nonlinearly associated with dependent variables, but they are often adjusted using a linear term. The purpose of this study was to examine the error of mis-specifying the nonlinear confounding effect. Methods: We carried out a simulation study to investigate the effect of adjusting for a nonlinear confounder in the estimation of a causal relationship between the exposure and outcome in 3 ways: using a linear term, binning into 5 equal-size categories, or using a restricted cubic spline of the confounder. Continuous, binary, and survival outcomes were simulated. We examined the confounder across varying measurement error. In addition, we performed a real data analysis examining the 3 strategies to handle the nonlinear effects of accelerometer-measured physical activity in the National Health and Nutrition Examination Survey 2003–2006 data. Results: The mis-specification of a nonlinear confounder had little impact on causal effect estimation for continuous outcomes. For binary and survival outcomes, this mis-specification introduced bias, which could be eliminated using spline adjustment only when there is small measurement error of the confounder. Real data analysis showed that the associations between high blood pressure, high cholesterol, and diabetes and mortality adjusted for physical activity with restricted cubic spline were about 3% to 11% larger than their counterparts adjusted with a linear term. Conclusion: For continuous outcomes, confounders with nonlinear effects can be adjusting with a linear term. Spline adjustment should be used for binary and survival outcomes on confounders with small measurement error. © 2017 SHAPE America


Tay D.,Hong Kong Polytechnic University
Journal of Pragmatics | Year: 2017

Motivational posters in public spaces are known to be effective in influencing attitudes, but their electronic counterparts have been considered as dubious ‘pop psychology’. The structure and content of these posters, which may relate to their effectiveness, have however not been adequately analyzed from discourse analytic perspectives. This paper examines aspects of metaphor construction in a sample of 900 online motivational posters. Identified metaphor units were coded with variables related to their VEHICLE, TOPIC, and MODE, and relationships between these variables explored. The results (i) suggest metaphor as a common feature of motivational posters, (ii) reveal prominent topics, vehicles, and topic-vehicle pairings, (iii) show that while metaphor units tend to be multi-modally presented, topics tend to be only verbally presented, and (iv) uncover tendencies for particular topics and vehicles to be presented either verbally, visually, or multi-modally. The present approach focuses on interpreting patterns of content and form underlying a larger quantity of data, complementing multimodal metaphor studies which richly explicate a limited set of examples. Implications and future research directions are offered. © 2017 Elsevier B.V.


Yin J.-H.,Hong Kong Polytechnic University | Feng W.-Q.,Hong Kong Polytechnic University
Canadian Geotechnical Journal | Year: 2017

The calculation of the consolidation settlement of clayey soils with creep behaviour has been a challenging issue with a long history. After a brief review the assumptions made in the two methods based on Hypothesis A and Hypothesis B, the authors present a new simplified hypothesis B method for calculation of consolidation settlement of a clayey soil with creep. Equations of this method are derived based on the “equivalent time” concept for different stress–strain states. This simplified Hypothesis B method is then used to calculate the consolidation settlement of a number of typical consolidation problems. The approximation and verification of this simplified method are examined by comparing the calculated settlements with settlements computed using two fully coupled finite element (FE) consolidation analysis programs using elastic viscoplastic (EVP) constitutive models (Hypothesis B) and the Hypothesis A method. It is found that the curves calculated using the new Hypothesis B simplified method with a factor α = 0.8 are close to curves from two FE model simulations with relative errors in the range 0.37%~8.42% only for three layers of Hong Kong marine clay (HKMC). In overall, the settlements calculated using Hypothesis A method are smaller than those from the two FE simulations with relative error in the range 6.52%~46.17% for the three layers of HKMC. In addition, this new simplified Hypothesis B method is used to calculate the average strain of consolidation tests done by Berre and Iversen in 1972. The calculated results are compared with the test data, and values from a fully coupled finite difference (FD) consolidation analysis using Yin and Graham’s EVP constitutive model (Hypothesis B), and Hypothesis A method. It is found that, again, the results from the new simplified Hypothesis B method are very close to the measured data. In conclusion, the new simplified Hypothesis B method is a suitable simple method, by spread-sheet calculation of the consolidation settlement of a single layer of a clayey soil with creep. © 2017, Canadian Science Publishing. All rights reserved.


Wong F.Y.,Hong Kong Polytechnic University
International Journal of Health Geographics | Year: 2017

Background: The prevalence of overweight is increasing and the effectiveness of various weight management and exercise programs varied. An augmented reality smartphone game, Pokémon Go, appears to increase activity levels of players. This study assessed the players and ex-players' frequencies and durations of staying outdoors, and walking/jogging before and during the time they played Pokémon Go, evaluated the physical activity levels of players, ex-players and non-players, and investigated the potential factors which determined their play statuses. Methods: Students in a university answered an online-questionnaire survey. The IPAQ-short form was incorporated to measure vigorous-intensity activities, moderate-intensity activities and walking. Chi square tests were used to compare frequencies and durations of staying outdoors and walking/jogging, health discomforts and physical activity levels between players, ex-players and non-players. Wilcoxon signed ranks tests were performed to assess the changes prior to and during the time when the players and ex-players played Pokémon Go. Logistic regression analyses were performed to assess factors contributing to playing, quitting or not playing Pokémon Go. Results: 644 university students answered the questionnaire. Compared with the ex-players, the players were significantly more frequent to stay outdoors when playing Pokémon Go (P < 0.001), walk/jog to a location to catch Pokémon, to Pokéstops or Gyms (P < 0.005), as well as walking/jogging to hatch eggs (P < 0.001). The players spent a mean of 108.19 ± 158.21 min/week to walk/jog in order to play the game which is equivalent to burning 357 kcal/week for a 60-kg person walking a moderate pace. Compared with the non-players, players were more likely to be aged 18-25 years [OR (95% CI) 3.28 (1.28-8.40), P = 0.013], never [OR (95% CI) 10.51 (1.12-98.57), P = 0.039] or rarely [OR (95% CI) 4.00 (1.95-8.23), P < 0.001] stayed outdoors and rarely walked/jogged prior to playing the game [OR (95% CI) 3.88 (1.86-8.05), P < 0.001]. However, there was no significant difference in physical activity levels between the three groups (P = 0.573). Conclusions: Players who used to be sedentary benefited the most from Pokémon Go. The game can be used as a starting point for sedentary people to begin an active lifestyle. The impact of Pokémon Go on physical activity can provide insights to public health workers in using novel strategies in health promotion. © 2017 The Author(s).


Ren J.,Hong Kong Polytechnic University | Lutzen M.,University of Southern Denmark
Renewable and Sustainable Energy Reviews | Year: 2017

The selection of alternative energy sources for shipping can effectively mitigate the problems of high energy consumption and severe environmental problems caused by shipping. However, it is usually difficult for decision makers to select the most sustainable alternative energy source for shipping among multiple alternatives due to the complexity of considering different aspects of performances and the lack of information. This study developed a novel multi-criteria decision-making method that combines Dempster-Shafer theory and a trapezoidal fuzzy analytic hierarchy process for alternative energy source selection under incomplete information conditions. According to the developed method, nuclear power has been recognized as the most sustainable alternative energy source for shipping, followed by liquefied natural gas (LNG) and wind power, and sensitivity analysis reveals that the weights of the criteria have significant on the sustainability sequence of the three alternative energy sources for shipping. The developed method can be popularized for selecting the most sustainable alternative energy source despite incomplete information. © 2017 Elsevier Ltd


Cao Y.,Hong Kong Polytechnic University | Sandeep R.B.,Indian Institute of Technology Hyderabad | Sandeep R.B.,Hungarian Academy of Sciences
Proceedings of the Annual ACM-SIAM Symposium on Discrete Algorithms | Year: 2017

Performing Gaussian elimination to a sparse matrix may turn some zeroes into nonzero values, so called fill-ins, which we want to minimize to keep the matrix sparse. Let n denote the rows of the matrix and k the number of fill-ins. For the minimum fill-in problem, we exclude the existence of polynomial time approximation schemes, assuming P6=NP, and the existence of 2O(n1)-time approximation schemes for any positive , assuming the Exponential Time Hypothesis. Also implied is a 2O(k1=2) nO(1) parameterized lower bound. Behind these results is a new reduction from vertex cover, which might be of its own interest: All previous reductions for similar problems are from some kind of graph layout problems. Copyright © by SIAM.


Bilal M.,Hong Kong Polytechnic University | Nichol J.E.,Hong Kong Polytechnic University | Spak S.N.,University of Iowa
Aerosol and Air Quality Research | Year: 2017

Fine particulate matter (PM2.5) has recently gained attention worldwide as being responsible for severe respiratory and cardiovascular diseases, but point based ground monitoring stations are inadequate for understanding the spatial distribution of PM2.5 over complex urban surfaces. In this study, a new approach is introduced for prediction of PM2.5 which uses satellite aerosol optical depth (AOD) and binning of meteorological variables. AOD from the MODerate resolution Imaging Spectroradiometer (MODIS) Collection 6 (C006) aerosol products, MOD04_3k Dark-Target (DT) at 3 km, MOD04 DT at 10 km, and MOD04 Deep-Blue (DB) at 10 km spatial resolution, and the Simplified Aerosol Retrieval Algorithm (SARA) at 500 m resolution were obtained for Hong Kong and the industrialized Pearl River Delta (PRD) region. The SARA AOD at 500 m alone achieved a higher correlation (R = 0.72) with PM2.5 concentrations than the MODIS C6 DT AOD at 3 km (R = 0.60), the DT AOD at 10 km (R = 0.61), and the DB AOD at 10 km (R = 0.51). The SARA binning model ([PM2.5] = 110.5 [AOD] + 12.56) was developed using SARA AOD and binning of surface pressure (996-1010 hPa). This model exhibits good correlation, accurate slope, low intercept, low errors, and accurately represents the spatial distribution of PM2.5 at 500 m resolution over urban areas. Overall, the prediction power of the SARA binning model is much better than for previous models reported for Hong Kong and East Asia, and indicates the potential value of applying meteorologicallyspecific empirical models and incorporating boundary layer height in operational PM2.5 forecasting from satellite AOD retrievals. © Taiwan Association for Aerosol Research.


Fung H.W.,Hong Kong Polytechnic University
Journal of Trauma and Dissociation | Year: 2017

Dissociative symptoms and disorders have been reported in many different cultures. If pathological dissociation is naturally occurring and related to adverse experiences, such phenomena should have been witnessed and portrayed before the modern age. To investigate whether this is the case, the author made use of the rich ancient Chinese medicine literature and looked for descriptions of pathological dissociation in medical documents written by ancient Chinese medical practitioners. In this paper, the author presents six cases selected from the ancient Chinese medicine literature. The phenomenon of pathological dissociation is observed in these cases. This is the first report of case descriptions of pathological dissociation documented in Chinese cultures before 1900. © 2017 Taylor & Francis Group, LLC


Ping Zhang A.,Hong Kong Polytechnic University
Optics InfoBase Conference Papers | Year: 2016

One of appealing trends in the development of optical fiber-based devices is to integrate with emerging functional materials to exploit new optical fiber devices and sensors. Here, we present a specialty optical microfabrication technology for in-situ printing of functional polymeric materials on the side- and end-surface of optical fibers to develop novel fiber-optic devices and sensors. On-fiber printed hydrogel grating sensors and suspended-mirror devices will be demonstrated. © OSA 2016.


This paper proposes a system design of an Adaptive Food Preservation System (AFPS). It is motivated by the fact that constant storage condition in today's refrigerators has deficiency. Customized storage with fast freezing capability can better manage food quality and energy efficiency. Key components include AFPS packages and vortex tubes. Superior fast freezing capability is demonstrated by comparisons with benchmarks from refrigerator tests and regulatory standards, and experimentation with a simulated test setup at various settings of input. Theoretical and analytical models are proposed to predict package inlet and exit temperatures, freezing capacities, and freezing efficiencies. At 7 bar inlet pressure, the maximum available freezing efficiency, mean efficiencies with vacuum insulation and with ABS insulation of the AFPS Package and Vortex Tube Assembly are 6%, 4.66%, and 2.80%, respectively. AFPS technology consumes 0.18% in time and 45% in energy during fast freezing comparing with what a typical household freezer does. © 2017 Elsevier Ltd and IIR


Gao W.-Y.,Hong Kong Polytechnic University | Teng J.-G.,Hong Kong Polytechnic University | Dai J.-G.,Hong Kong Polytechnic University
Magazine of Concrete Research | Year: 2017

This paper presents the development of a design approach for predicting the fire resistance of reinforced concrete (RC) beams exposed to design fire. The proposed method is based on the energy-based time equivalence method in combination with a correction factor that is formulated as a function of concrete cover depth and compartmental characteristics. In the proposed approach, the fire resistance period of an RC beam under design fire exposure can be deduced from that of the same RC beam under standard fire exposure; the latter can be predicted using a set of explicit equations previously developed by the authors. The fire resistance data of RC beams under design fire exposure, which were used to formulate and validate the proposed approach, were generated using a reliable finite-element approach. The proposed design approach is shown to be accurate in predicting the fire resistance of RC beams under design fire exposure. © 2017, ICE Publishing. All rights reserved.


Wang H.,Hong Kong Polytechnic University | Jing X.J.,Hong Kong Polytechnic University
Mechanical Systems and Signal Processing | Year: 2017

This paper proposes a novel method for the fault diagnosis of complex structures based on an optimized virtual beam-like structure approach. A complex structure can be regarded as a combination of numerous virtual beam-like structures considering the vibration transmission path from vibration sources to each sensor. The structural ‘virtual beam’ consists of a sensor chain automatically obtained by an Improved Bacterial Optimization Algorithm (IBOA). The biologically inspired optimization method (i.e. IBOA) is proposed for solving the discrete optimization problem associated with the selection of the optimal virtual beam for fault diagnosis. This novel virtual beam-like-structure approach needs less or little prior knowledge. Neither does it require stationary response data, nor is it confined to a specific structure design. It is easy to implement within a sensor network attached to the monitored structure. The proposed fault diagnosis method has been tested on the detection of loosening screws located at varying positions in a real satellite-like model. Compared with empirical methods, the proposed virtual beam-like structure method has proved to be very effective and more reliable for fault localization. © 2016 Elsevier Ltd


Lai J.H.K.,Hong Kong Polytechnic University
Facilities | Year: 2017

Purpose: The study aims to reveal the state of building operation and maintenance (O&M) manpower in Hong Kong. In addition, the study included supply and demand of O&M practitioners, gaps between their required and possessed competences and ways to meet the manpower needs. Design/methodology/approach: After developing a model that integrates manpower levels (L), trades (T) and natures (N) of O&M works (named as “LTN” model), a full spectrum of O&M jobs were established followed by collecting data of 75 organizations and 402 stakeholders through two surveys. Findings: Besides the large O&M workforce, vacancy rates of the jobs were found to be significant. For the different trades and natures of O&M works, the knowledge/skills levels perceived by the stakeholders were lower than the corresponding importance levels. Research limitations/implications: The methodology of the study can be used in future research for revealing the state of O&M manpower in Hong Kong and cities alike. The way in which the “LTN” model was developed may be used as a reference for constructing similar models for manpower research in other industries. Practical implications: The findings and the measures for improving the O&M manpower can assist policymakers and human resources departments to formulate necessary education and training courses for the building industry. Originality/value: The study is the first of its kind focusing on building O&M manpower. The state of the manpower it unveiled forms a basis for comparison with similar findings in future. © 2017, © Emerald Publishing Limited.


Chen W.,Hong Kong Polytechnic University
IEEE Region 10 Annual International Conference, Proceedings/TENCON | Year: 2017

The 2D optical decoded-image correlation is presented by using simultaneous compression of input image and the phase in the recording plane. The compressed input is encrypted via double random phase encoding. In recording plane, complex-valued wavefront is extracted, and only phase part is retained and compressed as ciphertext. During the decoding, due to the designed strategy, the decoded image cannot visually render information related to input image. The decoded-image correlation is conducted to verify whether the receiver possesses correct keys or is an authorized person. The method using simultaneous compression of input image and the phase in the recording plane could be used as a complementary alternative for optical information correlation. © 2016 IEEE.


News Article | April 21, 2017
Site: www.prweb.com

The Hong Kong Polytechnic University (PolyU) launched today the University Research Facility in 3D Printing (U3DP), the first 3D printing facility among higher education institutions in Hong Kong to support teaching, learning and research. It is also the largest research centre in 3D printing, in terms of the range and quantity of facilities in Hong Kong. With an area of 620 square metres and more than 50 sets of 3D printers for different functions and materials, the URF in 3D Printing provides state-of-the-art 3D printing facilities which will help the followings: The U3DP is expected to help faculty members and students excel in their teaching and learning, research and innovation with the aid of 3D printing technologies. With the full range of technologies from 3D scanning, computer aided-design modelling to printing, and the full range of materials including metal, plastic, biocompatible resin, silver ink and graphene, resulting in multi-material and multi-colour output, the imagination of faculty members and students can be unleashed, with their innovations, designs and prototypes materialized easily. At the Opening Ceremony today, Mr Chan Tze-ching, PolyU Council Chairman remarked, “The U3DP will provide an innovative and inspirational environment for faculty members and students to make the best use of their capability in innovation and creativity. It will also help strengthen industry-PolyU collaboration through research and consultancy.” Officiating at the Opening Ceremony, Professor John Leong Chi-yan, Chairman of Hospital Authority said the collaboration between the PolyU and Queen Elizabeth Hospital (QEH) is a good example of how local talents get together to improve the quality of medical care in Hong Kong. “We are proud to see the Transcatheter Aortic Valve Implantation (TAVI) Simulation Model unveiled today, it is a made-in-Hong Kong technology that benefits our patients and help train our doctors. PolyU is one of the pioneers in developing 3D printing technology on health care, while the QEH simulation training experts and cardiologists have made much effort and contribution over the years in training doctors with ultra-high operative skills before they walk in the operation theater to conduct complicated surgical procedures. It is encouraging to see the two great teams work together, I look forward to seeing more collaboration of such kind in the future,” Professor Leong said. The Queen Elizabeth Hospital has teamed up with PolyU to support the training for medical staff through the collaborative development of a 3D printed simulation training model mimicking the real clinical procedure, with a view to enhancing the quality of healthcare service for the community. As the Government pledges to support the development of Industry 4.0, the U3DP in 3D printing will certainly be a key player in the process, enabling and facilitating the research of many new initiatives.


News Article | April 26, 2017
Site: www.prweb.com

An innovative “Smart Scar-Care” pad which serves the dual functions of reinforcing pressure and occlusion has been designed by The Hong Kong Polytechnic University (PolyU) to treat hypertrophic scars from burns, surgeries and trauma. Compared with the traditional pressure pads and silicone gel sheets, “Smart Scar-Care” pad has the advantages of both. It showed good performance in reducing pigmentation and vascularity, improving elasticity and preventing dehydration in a clinical trial. It is more durable and user-friendly compared with the traditional pad (polyethylene foam) as reported by the patients. This innovative design has won the Grand Award and Gold Medal with the Congratulations of Jury at the 45th International Exhibition of Inventions of Geneva, 2017. Burns, surgeries and trauma will create open wounds to the human skin. Delayed wound healing can result in formation of hypertrophic scar, which will cause aesthetic problems, and induce severe deformities, thus causing dysfunctions. Pressure therapy is the first line non-invasive treatment for hypertrophic scars. Pressure garment and pressure pads made with polyethylene foam are generally used by the local therapists. However, they are uncomfortable to wear and often non-durable to sustain the pressure on the scar. The commercial silicone gel products are used to manage hypertrophic scar but they could mainly moisturize the hypertrophic scar. The “Smart Scar-Care” pad designed by Professor Cecilia Li-Tsang in the Department of Rehabilitation Sciences, PolyU, is developed to combine the effect of pressure therapy and silicone gel on scar management. It is composed of silicone stiffener and medical grade silicone gel sheet. The silicone stiffener is made of silicone rubber. Its smooth side is attached to the silicone gel sheet which serves to moisturize the scar. The other side of the silicone stiffener is characterized by the circular silicone studs which could easily be adjusted to shape the curved or flat skin surfaces to provide even pressure under elastic bandages or pressure garment. The “Smart Scar-Care” pad has been designed with different stud height, diameter and gel thickness. If applied to flat or concaved areas, such as chest, dorsal hand and abdomen, higher studs will be used to create a larger curvature. In addition, thicker gel sheets may be applied to thicker scars whereas thinner gel sheets may be applied to thinner scars. The “Smart Scar-Care” pad has a number of advantages over the traditional polyethylene foam. It can be easily trimmed to fit into the size of the scar and body contours while the fabrication of the polyethylene foam sheets is time consuming and has to be made by the occupational therapists. Besides, the “Smart Scar-Care” pad is more durable, and can last for two to three months while the polyethylene foam may last only a few weeks. Case studies with longer follow up showed that, the “Smart Scar-Care” pad demonstrated its effect to improve hypertrophic scars as well as patients’ quality of life. Patients are advised to start applying pressure pad as soon as the wound is healed, and to use until the scar is mature completely, which normally take at least six months. Some may need a longer time for the scar to become mature.


News Article | April 13, 2017
Site: www.cemag.us

The Department of Mechanical Engineering of The Hong Kong Polytechnic University (PolyU) has developed a novel technology of embedding highly conductive nanostructure into semi-conductor nanofiber. The novel composite so produced has superb charge conductivity, and can therefore be widely applied, especially in environmental arena. The innovation was awarded the Gold Medal with Congratulations of the Jury at the 45th International Exhibition of Inventions of Geneva. Semiconductor made into nanofiber of diameter as small as 60nm (less than 1/1,000 of a human hair) have been widely used in modern daily life photonic devices (such as solar cells, photocatalyst for cleaning the environment), and non-photonic devices (such as chemical-biological sensor, lithium battery). However, electrons and holes generated by light or energy in semiconductor would readily recombine, thus reduce the current or device effectiveness. Such nature has limited the further development and applications of semiconductor nanofibers. The novel technology developed by the research team led by Professor Wallace Leung, Chair Professor of Innovative Products and Technologies of the Department, have overcome such limitation. Applying electrospinning, the team succeeds in inserting highly conductive nano-structure (such as carbon nanotubes, graphene) into semiconductor nanofiber (such as Titanium Dioxide (TiO ). The novel nano-composite so produced thus provides a dedicated super-highway for electron transport, eliminating the problem of electron-hole recombination. Amidst the potentially wide applications of the innovation in many spectrum, Professor Leung's team has initially embarked on research of applying the novel nano-composite in two environmental aspects: solar cells, and photocatalysts for cleaning air. The latest generation of solar cells (e.g. dye sensitized solar cell (DSSC)), perovskite solar cell) are promising clean and renewable energy sources. Yet, for more wide applications, there are still much room for further enhancing their power conversion efficiency and producing in more cost-efficient ways. By applying PolyU's novel technology, carbon nanotube/graphene is embedded into the TiO component of DSSC and perovskite solar cell, boosting an increase of energy conversion from 40 to 66 percent. Compared to commercially available multi-crystalline silicon solar cell common in the market, with current price at US$0.25 (HK$1.94)/kWh, the cost of DSSC with carbon nanotube embedded is 12 to 32 percent higher (HK$2.18-2.56); while perovskite solar cell embedded with graphene is 28 to 40 percent lower (HK$1.17-1.40). Given the superb charge conductivity of the novel semiconductor nanofiber, there is great potential for prompt development of more efficient solar cells, and at lower cost, than the silicon cells. TiO is the most commonly used photocatalyst material in commercially available air-purifying or disinfection devices in the market. However, TiO can only be activated by ultraviolet light (i.e. about 6 percent of solar energy), thus limiting its wider application as it is less effective in indoor environment. It is also relatively ineffective in converting nitric oxide (NO) into nitrogen dioxide (NO ), at a rate of less than 5 percent. By applying PolyU's novel technology, graphene roll is embedded into TZB composite (which mainly compose of TiO ). The novel semiconductor nanofiber so produced has superb conductivity, which provide a graphene superhighway for electrons to transport more quickly to oxide the absorbed pollutants. The technology also significantly increase the novel nano-fiber's surface exposed for light absorption and trapping harmful molecules. Such novel semiconductor nanofiber can convert about 90 percent of NO to NO , a 35 percent increase compared to composite without graphene. If compared to high-standard TiO nano-particles commonly available in the market, the conversion rate is even 10 times more, yet 10 times more cost-efficient. Given the wide uses of semiconductor nanofiber now and in the future, the PolyU groundbreaking technology that develops semiconductor nanofiber with superb charge conductivity has great potential for further development for different applications. Besides in solar cells and photocatalysts, other obvious examples of making use of such novel technology include the development of biological-chemical sensors with enhanced sensitivity and sensing speed, and lithium batteries with lower impedance and increased storage.


News Article | April 26, 2017
Site: www.eurekalert.org

An innovative "Smart Scar-Care" pad which serves the dual functions of reinforcing pressure and occlusion has been designed by The Hong Kong Polytechnic University (PolyU) to treat hypertrophic scars from burns, surgeries and trauma. Compared with the traditional pressure pads and silicone gel sheets, "Smart Scar-Care" pad has the advantages of both. It showed good performance in reducing pigmentation and vascularity, improving elasticity and preventing dehydration in a clinical trial. It is more durable and user-friendly compared with the traditional pad (polyethylene foam) as reported by the patients. This innovative design has won the Grand Award and Gold Medal with the Congratulations of Jury at the 45th International Exhibition of Inventions of Geneva, 2017. Burns, surgeries and trauma will create open wounds to the human skin. Delayed wound healing can result in formation of hypertrophic scar, which will cause aesthetic problems, and induce severe deformities, thus causing dysfunctions. Pressure therapy is the first line non-invasive treatment for hypertrophic scars. Pressure garment and pressure pads made with polyethylene foam are generally used by the local therapists. However, they are uncomfortable to wear and often non-durable to sustain the pressure on the scar. The commercial silicone gel products are used to manage hypertrophic scar but they could mainly moisturize the hypertrophic scar. The "Smart Scar-Care" pad designed by Professor Cecilia Li-Tsang in the Department of Rehabilitation Sciences, PolyU, is developed to combine the effect of pressure therapy and silicone gel on scar management. It is composed of silicone stiffener and medical grade silicone gel sheet. The silicone stiffener is made of silicone rubber. Its smooth side is attached to the silicone gel sheet which serves to moisturize the scar. The other side of the silicone stiffener is characterized by the circular silicone studs which could easily be adjusted to shape the curved or flat skin surfaces to provide even pressure under elastic bandages or pressure garment. The "Smart Scar-Care" pad has been designed with different stud height, diameter and gel thickness. If applied to flat or concaved areas, such as chest, dorsal hand and abdomen, higher studs will be used to create a larger curvature. In addition, thicker gel sheets may be applied to thicker scars whereas thinner gel sheets may be applied to thinner scars. The "Smart Scar-Care" pad has a number of advantages over the traditional polyethylene foam. It can be easily trimmed to fit into the size of the scar and body contours while the fabrication of the polyethylene foam sheets is time consuming and has to be made by the occupational therapists. Besides, the "Smart Scar-Care" pad is more durable, and can last for two to three months while the polyethylene foam may last only a few weeks. Case studies with longer follow up showed that, the "Smart Scar-Care" pad demonstrated its effect to improve hypertrophic scars as well as patients' quality of life. Patients are advised to start applying pressure pad as soon as the wound is healed, and to use until the scar is mature completely, which normally take at least six months. Some may need longer time for scar to become mature.


News Article | April 19, 2017
Site: www.prlog.org

The Hong Kong Polytechnic University (PolyU) launched today the University Research Facility in 3D Printing (U3DP), the first 3D printing facility among higher education institutions in Hong Kong to support teaching, learning and research.


Researchers have developed a highly sensitive, accurate, flexible and affordable biological sensor that can detect glucose levels in saliva. Credit: The Hong Kong Polytechnic University Diabetes is a metabolic disease defined by high blood sugar levels, and can affect organs such as the heart, eyes and kidneys. According to the World Health Organization, over 420 million people suffer from this condition worldwide. People with diabetes must monitor their blood glucose levels regularly and frequently, but the existing method is invasive, as it requires taking a blood sample from the patient's fingertip. Dr Yan Feng and his research team at The Hong Kong Polytechnic University (PolyU) have developed a highly sensitive, accurate, flexible and affordable biological sensor that can detect glucose levels in saliva. The device is based on an organic electrochemical transistor (OECT), a highly sensitive and easy-to-fabricate platform for biosensors that can convert biological elements such as ions, lactose and glucose into electrical currents. The challenge with OECTs, however, is to create a selective biosensor that is only sensitive to a specific substance, such as glucose, because OECTs can also pick up electrical currents from other biochemicals. What's more, since the amount of glucose in saliva is very small, it is difficult to detect. In order to overcome these issues, the PolyU researchers built the OECT platform using a glucose oxidase enzyme, which is only sensitive to glucose. The team then coated the enzyme with two types of polymer layers to prevent interference from other substances in saliva, thereby increasing both the selectivity and sensitivity of the device. The researchers say the new biosensor is nearly 1,000 times more sensitive than the conventional blood glucose testing method. It is also flexible and has the potential, after further research, to be incorporated into wearable technologies to monitor glucose levels from sweat, the researchers add. Its low manufacturing cost also makes it suitable for mass production. Furthermore, by changing the enzyme, the biosensor could be used to monitor other substances such as uric acid or cholesterol levels, for example. Yan plans to further optimize the current sensor's features, such as its stability and geometrical design, and improve its fabrication technique to be more suitable for commercial mass production. He also wants to develop different types of biological sensors using the same platform. Explore further: Team develops highly sensitive biosensor for measuring glucose in saliva


News Article | April 26, 2017
Site: www.prlog.org

An innovative "Smart Scar-Care" pad which serves the dual functions of reinforcing pressure and occlusion has been designed by The Hong Kong Polytechnic University (PolyU) to treat hypertrophic scars from burns, surgeries and trauma.


News Article | April 20, 2017
Site: www.prlog.org

With the generous support from The D. H. Chen Foundation, the Faculty of Applied Science and Textiles (FAST) of The Hong Kong Polytechnic University (PolyU) invited Prof.


The inaugural Times Higher Education (THE) Innovation & Impact Summit, co-hosted by The Hong Kong Polytechnic University (PolyU) and THE, will run from 31 May to 2 June 2017 at Hotel ICON in Hong Kong. A key celebratory event of PolyU's 80th anniversary, the Summit will feature keynote speeches and a series of thought-provoking panel discussions under the theme of "Powering Universities' Economic and Social Impact through Innovative Research and Teaching". The Summit will commence with a PolyU Showcase on 31 May, highlighting the four areas that PolyU innovations have been creating impacts to the economy and society, while uplifting university-industry partnership. The feature contents in the four sessions are: There will be presentations of how PolyU ventured into space, and how we developed optical fibre sensing system for railway monitoring and technologies in enhancing aircraft maintenance, repair and overhaul. 2. Sustainable urban development PolyU will share how we develop and implement new technologies and solutions for sustainable urban development and smart cities, and will open up discussions of the role of higher education institutions in changing and sustaining the landscapes of urban development. The Showcase will feature the application of human-centered innovation in genetics research in healthcare, advanced solutions to the development of the garment industry, and how research on Asian head and face shapes changes the world's perception of sizing, benefiting a host of industries that create products such as sunglasses, helmets and more. Pioneering teaching innovations in global hotel and tourism management will be highlighted and there will be Chinese wine appreciation at Vinoteca Lab. Visits: state-of-the-art facilities in School of Hotel and Tourism Management, Designer Suite by Vivienne Tam and other facilities in Hotel ICON. In the two-day Summit (1-2 June), a series of keynote addresses and panel discussions will cover a wide spectrum of topics, including: •    Calculating the economic and social impact of higher education These discussions will serve to inspire participating universities and organisations on how to address the global shifts in the economic, social and environmental landscape through creating and enhancing impact with higher education, research and innovations. World-class speakers include high-profile innovators, entrepreneurs and policy-makers will join, including Charles Chen Yidan, founder of Yidan Prize and core founder of Tencent Holdings Limited; Hermann Hauser, co-founder of Amadeus Capital Partners; Candace Johnson, Founder/Co-Founder SES, Loral-Teleport Europe, Europe Online, VATM, GTWN, OWNSAT, Success Europe; Greg Simon, Former executive director, White House Cancer Moonshot Task Force and Nicholas Yang, Secretary for Innovation and Technology, HKSAR government. Other influential higher education figures to address the Summit include leaders of renowned institutions from, to name just a few, Australia, England, Finland, France, Hong Kong, India, Israel, Japan, Singapore, Spain, the United States. It will be an incredible fusion of East and West. For registration, details of the PolyU Showcase and the Summit, as well as the full list of speakers, please visit the official website: https://goo.gl/kedVru


News Article | May 6, 2017
Site: www.prweb.com

The Hong Kong Polytechnic University (PolyU) co-hosted a United Nations-supported international conference recently on the challenges and opportunities of ocean and coastal sustainable development under the United Nations Sustainable Development Goals (UNSDG) Agenda. Held on the campus of PolyU, the “Healthy Oceans – Healthy Coast” International Leadership Conference on 25-26 April 2017 was attended by around forty experts from the United Nations and related government and non-government representatives from overseas and the Chinese mainland. The discussion focused on UNSDG which provides guidelines and targets for all countries to adopt and achieve in accordance with their own priorities and the environmental challenges of the world at large. The Conference was supported by the United Nations Conference on Trade and Development (UNCTAD), an authoritative knowledge-based institution, to help shape current policy debates and development strategies, with a particular focus on ensuring that domestic policies and international action are mutually supportive in bringing about sustainable development. Other lead organisers were the International Ocean Institute and Shenzhen World Health Foundation. Faculty and graduate students from PolyU’s Department of Logistics and Maritime Studies and Research Institute for Sustainable Urban Development shared their research work on green shipping and high-density coastal development. PolyU’s Vice President (Student and Global Affairs), Professor Angelina Yuen, said, “PolyU has always been committed to the sustainable development of the community. We are honoured to have taken part in and contributed ideas to the global discussion on issues relating to the oceans. With concerted efforts, I am confident that together we can make progress on this important global challenge.” The conference concluded with the drafting of a summary document which will be shared at the upcoming United Nations Oceans Conference co-hosted by the Governments of Fiji and Sweden at the UN Headquarters in New York on 5-9 June 2017 to support the implementation of Sustainable Development Goal 14: Conserve and sustainably use the oceans, seas and marine resources for sustainable development.


News Article | April 21, 2017
Site: www.prweb.com

With the generous support from The D. H. Chen Foundation, the Faculty of Applied Science and Textiles (FAST) of The Hong Kong Polytechnic University (PolyU) invited Prof. Dan Shechtman, 2011 Nobel Laureate in Chemistry, to speak at the PolyU 80th Anniversary ‧ The D. H. Chen Foundation Nobel Laureate Lecture Series in Hong Kong today (20 April 2017). The title of his lecture is "Why Should We Teach Technological Entrepreneurship in Universities?" Prof. Shechtman believes that the dropping birth rates in developed countries nowadays inevitably pose threats to the countries for maintaining stable and economically advanced societies. Apart from opening borders to waves of immigration or encouraging families to have more children, he believes skilled entrepreneurs can fill the gap by starting hi-tech businesses with high return on investiment and human capital, and hence is the key to building up thriving economies. He believes motivating university students of engineering, medicine and science as a start would help set up a group of role models of successful entreprenuers who will then kick start a process leading to a huge difference in the life of a country. Prof. Shechtman's Nobel Prize-awarded discovery of the Icosahedral Phase by TEM (Transmission Electro Microscope) opened the new science of quasiperiodic crystals. He is now Philip Tobias Professor of Materials Science at the Technion – Israel Institute of Technology and Professor of Materials Science and Engineering at Iowa State University. PolyU has invited renowned Nobel Laureates in various disciplines, including Physiology or Medicine, Chemistry, as well as Economic Sciences, to deliver insightful and informative lectures at TheNobel Laureate Lecture Series on a wide range of topics of interests to the local community. The Nobel Laureate Lecture Series is one of the celebratory events for PolyU's 80th anniversary. For further information, please visit https://www.polyu.edu.hk/fast/80anniversary/nobel_apr/.


The Department of Mechanical Engineering of The Hong Kong Polytechnic University (PolyU) has developed a novel bio-inspired nonlinear anti-vibration system that can significantly reduce vibration in various mechanic systems. The innovation far excels existing devices in cost-efficiency and performance reliability, and can have very wide applications. Inspired by the limb structures of birds and insects in motion vibration control, the novel X-shaped system is of capability to demonstrate nearly "zero response" to any vibration (quasi-zero low dynamic stiffness), but simultaneously of high loading capacity. It also features automatic high damping for strong vibration, and low damping for small vibration (thus preventing high damping's adverse effect on a system's normal functioning during small vibration). These advantages stem from the novel system's nonlinearity - a unique feature lacking in most vibration control systems nowadays which are usually following linear system design. The novel system can therefore be applied very widely in various engineering practices and vibration control devices. As a first step in transferring the innovation into daily life benefit, the research team led by Dr Xingjian Jing, Associate Professor of the department, has obtained funding, and facilities and trial support from the construction sector, to embark on research in applying the patented novel system to build an assistive anti-vibration exoskeleton for hand-held jackhammers. With superb anti-vibration performance, the new device can markedly help prevent hand-arm occupation diseases among construction workers. Using the new device, the vibration at hand/arm in drilling concrete ground can be significantly suppressed to the ideal safety level, compared with many commonly-used jackhammers in the market. The very low cost in manufacturing and maintenance, with great design flexibility for adapting to devices of different sizes and materials, can also enhance its potential popular use. At present, the market price of a common passive control jackhammer is around HK$1,000. It is estimated that PolyU's assistive anti-vibration exoskeleton added to such passive control system will need only an additional HK$1,000 - 2,000, yet with performance far excelling even good-quality active control device that cost about HK$,10,000 - 40,000. Dr Jing's innovative bio-inspired system is one of the three PolyU innovations having won the TechConnect Global Innovation Awards 2017. It is the first time for a Hong Kong higher education institution receives the awards, along with other global-renowned research institutes (including US NASA, National Labs, Georgia Tech, Princeton Lab, UCLA, Australia National U etc), at the TechConnect World Innovation Conference and Expo, the largest multi-sector summit for supporting the development and commercialization of innovations. The annual event held in the US gathers more than 4,000 technology innovators, ventures, industrial partners and investors from over 70 countries. Only the top 20% of innovations submitted to TechConnect World will receive awards, with assessment based on the potential positive impact the submitted technology will have on a specific industry sector. PolyU is the only awardee from Hong Kong, and snatches 3 out of the 26 global awards presented to non-US-federal-funded innovations across the world. Another 60 national awards are granted to innovations with US federal funding. The PolyU delegation will present their innovations and receive the awards in mid-May at TechConnect World conference and expo held in Washington DC. For details of the award, please visit its official website: http://www. Vibration can be controlled by passive systems, which isolate or mitigate vibration by passive techniques (e.g. rubber pads, mechanical springs, shock absorbers, base isolation), or via active systems, which apply force or energy in an equal and opposite fashion to the vibration force. In general, passive vibration control is most preferred in engineering practices, as its manufacturing, operating and maintenance cost is much lower than active system. It also consumes less energy, and is easier to repair, less complex and thus more reliable. However, the vibration control performance of active systems is much better. The PolyU novel bio-inspired X-shaped structure possesses all the benefits of the passive and active systems. It has superior nonlinear stiffness and damping characteristics which can suppress vibration transmission and/or absorb vibration energy dramatically in a beneficial nonlinear manner. The system thus has great potential in wide applications, other than applying in vibrating tools, such as jackhammers which is already undergoing research study by Dr Jing's team. Amidst the many spectra the novel system can be applied include robotics, railways, vehicle suspension, precise machines, offshore platforms, marine engineering, aeronautic engineering, and various civil structures like bridges, buildings, etc.


The Hong Kong Polytechnic University (PolyU) co-hosted a United Nations-supported international conference recently on the challenges and opportunities of ocean and coastal sustainable development under the United Nations Sustainable Development Goals...


News Article | May 5, 2017
Site: www.eurekalert.org

World-renowned innovators from higher education, government and business sectors will gather in an international summit in Hong Kong this summer to explore how to enhance universities' impacts through innovative research and teaching for the benefit of the society and mankind. The inaugural Times Higher Education (THE) Innovation & Impact Summit, co-hosted by The Hong Kong Polytechnic University (PolyU) and THE, will run from 31 May to 2 June 2017 at Hotel ICON in Hong Kong. A key celebratory event of PolyU's 80th anniversary, the Summit will feature keynote speeches and a series of thought-provoking panel discussions under the theme of "Powering Universities' Economic and Social Impact through Innovative Research and Teaching". The Summit will commence with a PolyU Showcase on 31 May, highlighting the four areas that PolyU innovations have been creating impacts to the economy and society, while uplifting university-industry partnership. The feature contents in the four sessions are: There will be presentations of how PolyU ventured into space, and how we developed optical fibre sensing system for railway monitoring and technologies in enhancing aircraft maintenance, repair and overhaul. PolyU will share how we develop and implement new technologies and solutions for sustainable urban development and smart cities, and will open up discussions of the role of higher education institutions in changing and sustaining the landscapes of urban development. The Showcase will feature the application of human-centered innovation in genetics research in healthcare, advanced solutions to the development of the garment industry, and how research on Asian head and face shapes changes the world's perception of sizing, benefiting a host of industries that create products such as sunglasses, helmets and more. Pioneering teaching innovations in global hotel and tourism management will be highlighted and there will be Chinese wine appreciation at Vinoteca Lab. Visits: state-of-the-art facilities in School of Hotel and Tourism Management, Designer Suite by Vivienne Tam and other facilities in Hotel ICON. In the two-day Summit (1-2 June), a series of keynote addresses and panel discussions will cover a wide spectrum of topics, including: These discussions will serve to inspire participating universities and organisations on how to address the global shifts in the economic, social and environmental landscape through creating and enhancing impact with higher education, research and innovations. World-class speakers include high-profile innovators, entrepreneurs and policy-makers will join, including Charles Chen Yidan, founder of Yidan Prize and core founder of Tencent Holdings Limited; Hermann Hauser, co-founder of Amadeus Capital Partners; Candace Johnson, Founder/Co-Founder SES, Loral-Teleport Europe, Europe Online, VATM, GTWN, OWNSAT, Success Europe; Greg Simon, Former executive director, White House Cancer Moonshot Task Force and Nicholas Yang, Secretary for Innovation and Technology, HKSAR government. Other influential higher education figures to address the Summit include leaders of renowned institutions from, to name just a few, Australia, England, Finland, France, Hong Kong, India, Israel, Japan, Singapore, Spain, the United States. It will be an incredible fusion of East and West. For registration, details of the PolyU Showcase and the Summit, as well as the full list of speakers, please visit the official website: https:/


The inaugural Times Higher Education (THE) Innovation & Impact Summit, co-hosted by The Hong Kong Polytechnic University (PolyU) and THE, will run from 31 May to 2 June 2017 at Hotel ICON in Hong Kong. A key celebratory event of PolyU's 80th anniversary, the Summit will feature keynote speeches and a series of thought-provoking panel discussions under the theme of "Powering Universities' Economic and Social Impact through Innovative Research and Teaching". The Summit will commence with a PolyU Showcase on 31 May, highlighting the four areas that PolyU innovations have been creating impacts to the economy and society, while uplifting university-industry partnership. The feature contents in the four sessions are: There will be presentations of how PolyU ventured into space, and how we developed optical fibre sensing system for railway monitoring and technologies in enhancing aircraft maintenance, repair and overhaul. 2. Sustainable urban development PolyU will share how we develop and implement new technologies and solutions for sustainable urban development and smart cities, and will open up discussions of the role of higher education institutions in changing and sustaining the landscapes of urban development. The Showcase will feature the application of human-centered innovation in genetics research in healthcare, advanced solutions to the development of the garment industry, and how research on Asian head and face shapes changes the world's perception of sizing, benefiting a host of industries that create products such as sunglasses, helmets and more. Pioneering teaching innovations in global hotel and tourism management will be highlighted and there will be Chinese wine appreciation at Vinoteca Lab. Visits: state-of-the-art facilities in School of Hotel and Tourism Management, Designer Suite by Vivienne Tam and other facilities in Hotel ICON. In the two-day Summit (1-2 June), a series of keynote addresses and panel discussions will cover a wide spectrum of topics, including: •    Calculating the economic and social impact of higher education These discussions will serve to inspire participating universities and organisations on how to address the global shifts in the economic, social and environmental landscape through creating and enhancing impact with higher education, research and innovations. World-class speakers include high-profile innovators, entrepreneurs and policy-makers will join, including Charles Chen Yidan, founder of Yidan Prize and core founder of Tencent Holdings Limited; Hermann Hauser, co-founder of Amadeus Capital Partners; Candace Johnson, Founder/Co-Founder SES, Loral-Teleport Europe, Europe Online, VATM, GTWN, OWNSAT, Success Europe; Greg Simon, Former executive director, White House Cancer Moonshot Task Force and Nicholas Yang, Secretary for Innovation and Technology, HKSAR government. Other influential higher education figures to address the Summit include leaders of renowned institutions from, to name just a few, Australia, England, Finland, France, Hong Kong, India, Israel, Japan, Singapore, Spain, the United States. It will be an incredible fusion of East and West. For registration, details of the PolyU Showcase and the Summit, as well as the full list of speakers, please visit the official website: https://goo.gl/kedVru


News Article | May 4, 2017
Site: www.eurekalert.org

IMAGE:  Experts from worldwide join the two-day high-level conference held at PolyU. Among them are Professor Angelina Yuen, PolyU Vice President (Student and Global Affairs) (first from left), and Mr. Bonapas... view more The Hong Kong Polytechnic University (PolyU) co-hosted a United Nations-supported international conference recently on the challenges and opportunities of ocean and coastal sustainable development under the United Nations Sustainable Development Goals (UNSDG) Agenda. Held on the campus of PolyU, the "Healthy Oceans - Healthy Coast" International Leadership Conference on 25-26 April 2017 was attended by around forty experts from the United Nations and related government and non-government representatives from overseas and the Chinese mainland. The discussion focused on UNSDG which provides guidelines and targets for all countries to adopt and achieve in accordance with their own priorities and the environmental challenges of the world at large. The Conference was supported by the United Nations Conference on Trade and Development (UNCTAD), an authoritative knowledge-based institution, to help shape current policy debates and development strategies, with a particular focus on ensuring that domestic policies and international action are mutually supportive in bringing about sustainable development. Other lead organisers were the International Ocean Institute and Shenzhen World Health Foundation. Faculty and graduate students from PolyU's Department of Logistics and Maritime Studies and Research Institute for Sustainable Urban Development shared their research work on green shipping and high-density coastal development. PolyU's Vice President (Student and Global Affairs), Professor Angelina Yuen, said, "PolyU has always been committed to the sustainable development of the community. We are honoured to have taken part in and contributed ideas to the global discussion on issues relating to the oceans. With concerted efforts, I am confident that together we can make progress on this important global challenge." The conference concluded with the drafting of a summary document which will be shared at the upcoming United Nations Oceans Conference co-hosted by the Governments of Fiji and Sweden at the UN Headquarters in New York on 5-9 June 2017 to support the implementation of Sustainable Development Goal 14: Conserve and sustainably use the oceans, seas and marine resources for sustainable development.


-- The Department of Mechanical Engineering of The Hong Kong Polytechnic University (PolyU) has developed a novel bio-inspired nonlinear anti-vibration system that can significantly reduce vibration in various mechanic systems. The innovation far excels existing devices in cost-efficiency and performance reliability, and can have very wide applications.Inspired by the limb structures of birds and insects in motion vibration control, the novel   X-shaped system is of capability to demonstrate nearly "zero response" to any vibration (quasi-zero low dynamic stiffness), but simultaneously of high loading capacity. It also features automatic high damping for strong vibration, and low damping for small vibration (thus preventing high damping's adverse effect on a system's normal functioning during small vibration). These advantages stem from the novel system's nonlinearity – a unique feature lacking in most vibration control systems nowadays which are usually following linear system design. The novel system can therefore be applied very widely in various engineering practices and vibration control devices.Superb Anti-vibration Device enhances Health Protection for WorkersAs a first step in transferring the innovation into daily life benefit, the research team led by Dr Xingjian Jing, Associate Professor of the department, has obtained funding, and facilities and trial support from the construction sector, to embark on research in applying the patented novel system to build an assistive anti-vibration exoskeleton for hand-held jackhammers.With superb anti-vibration performance, the new device can markedly help prevent hand-arm occupation diseases among construction workers. Using the new device, the vibration at hand/arm in drilling concrete ground can be significantly suppressed to the ideal safety level, compared with many commonly-used jackhammers in the market. The very low cost in manufacturing and maintenance, with great design flexibility for adapting to devices of different sizes and materials, can also enhance its potential popular use. At present, the market price of a common passive control jackhammer is around HK$1,000. It is estimated that PolyU's assistive anti-vibration exoskeleton added to such passive control system will need only an additional HK$1,000 - 2,000, yet with performance far excelling even good-quality active control device that cost about HK$,10,000 - 40,000.PolyU gains 3 TechConnect Global Innovation AwardsDr Jing's innovative bio-inspired system is one of the three PolyU innovations having won the TechConnect Global Innovation Awards 2017. It is the first time for a Hong Kong higher education institution receives the awards, along with other global-renowned research institutes (including US NASA, National Labs, Georgia Tech, Princeton Lab, UCLA, Australia National U etc), at the TechConnect World Innovation Conference and Expo, the largest multi-sector summit for supporting the development and commercialization of innovations. The annual event held in the US gathers more than 4,000 technology innovators, ventures, industrial partners and investors from over 70 countries.Only the top 20% of innovations submitted to TechConnect World will receive awards, with assessment based on the potential positive impact the submitted technology will have on a specific industry sector.  PolyU is the only awardee from Hong Kong, and snatches 3 out of the 26 global awards presented to non-US-federal-funded innovations across the world. Another 60 national awards are granted to innovations with US federal funding. The PolyU delegation will present their innovations and receive the awards in mid-May at TechConnect World conference and expo held in Washington DC.For details of the award, please visit its official website: http://www.techconnectworld.com/ World2017/participate/ inn... Bio-inspired Nonlinear Passive Anti-Vibration System with Wide ApplicationsVibration can be controlled by passive systems, which isolate or mitigate vibration by passive techniques (e.g. rubber pads, mechanical springs, shock absorbers, base isolation), or via active systems, which apply force or energy in an equal and opposite fashion to the vibration force. In general, passive vibration control is most preferred in engineering practices, as its manufacturing, operating and maintenance cost is much lower than active system. It also consumes less energy, and is easier to repair, less complex and thus more reliable. However, the vibration control performance of active systems is much better.


News Article | May 8, 2017
Site: www.prweb.com

World-renowned innovators from higher education, government and business sectors will gather in an international summit in Hong Kong this summer to explore how to enhance universities' impacts through innovative research and teaching for the benefit of the society and mankind. The inaugural Times Higher Education (THE) Innovation & Impact Summit, co-hosted by The Hong Kong Polytechnic University (PolyU) and THE, will run from 31 May to 2 June 2017 at Hotel ICON in Hong Kong. A key celebratory event of PolyU's 80th anniversary, the Summit will feature keynote speeches and a series of thought-provoking panel discussions under the theme of "Powering Universities' Economic and Social Impact through Innovative Research and Teaching". PolyU Showcase The Summit will commence with a PolyU Showcase on 31 May, highlighting the four areas that PolyU innovations have been creating impacts to the economy and society, while uplifting university-industry partnership. The feature contents in the four sessions are: 1. Space, aviation and railway There will be presentations of how PolyU ventured into space, and how we developed optical fibre sensing system for railway monitoring and technologies in enhancing aircraft maintenance, repair and overhaul. Visits: Aviation Services Research Centre and University Research Facility in 3D printing 2. Sustainable urban development PolyU will share how we develop and implement new technologies and solutions for sustainable urban development and smart cities, and will open up discussions of the role of higher education institutions in changing and sustaining the landscapes of urban development. Visits: Underground Utility Survey Laboratory, Construction Virtual Prototyping Laboratory and Fire Engineering Laboratory. 3. Human-centered innovation The Showcase will feature the application of human-centered innovation in genetics research in healthcare, advanced solutions to the development of the garment industry, and how research on Asian head and face shapes changes the world's perception of sizing, benefiting a host of industries that create products such as sunglasses, helmets and more. Tour: SizeChina, radiation-free scoliosis scan system, Public Design Lab. 4. Hospitality Pioneering teaching innovations in global hotel and tourism management will be highlighted and there will be Chinese wine appreciation at Vinoteca Lab. Visits: state-of-the-art facilities in School of Hotel and Tourism Management, Designer Suite by Vivienne Tam and other facilities in Hotel ICON. In the two-day Summit (1-2 June), a series of keynote addresses and panel discussions will cover a wide spectrum of topics, including: -Universities innovate to address the grand challenges -Translating research into business: turning ideas into impact -Creating and empowering entrepreneurs and future leaders -Calculating the economic and social impact of higher education These discussions will serve to inspire participating universities and organisations on how to address the global shifts in the economic, social and environmental landscape through creating and enhancing impact with higher education, research and innovations. World-class speakers include high-profile innovators, entrepreneurs and policy-makers will join, including Charles Chen Yidan, founder of Yidan Prize and core founder of Tencent Holdings Limited; Hermann Hauser, co-founder of Amadeus Capital Partners; Candace Johnson, Founder/Co-Founder SES, Loral-Teleport Europe, Europe Online, VATM, GTWN, OWNSAT, Success Europe; Greg Simon, Former executive director, White House Cancer Moonshot Task Force and Nicholas Yang, Secretary for Innovation and Technology, HKSAR government. Other influential higher education figures to address the Summit include leaders of renowned institutions from, to name just a few, Australia, England, Finland, France, Hong Kong, India, Israel, Japan, Singapore, Spain, the United States. It will be an incredible fusion of East and West. For registration, details of the PolyU Showcase and the Summit, as well as the full list of speakers, please visit the official website: https://goo.gl/kedVru


Dublin, April 18, 2017 (GLOBE NEWSWIRE) -- Research and Markets has announced the addition of the "Smart Textiles in Apparel: Markets, Applications and Technologies" report to their offering. This new report 'Smart Textiles in Apparel: Markets, Applications and Technologies' examines the markets for textile based wearable technologies, the companies producing them and the enabling technologies. This is creating a 4th industrial revolution for the textiles and fashion industry worth over $100 billion by 2025. Advances in fields such as nanotechnology, organic electronics (also known as plastic electronics) and conducting polymers are creating a range of textile-based technologies with the ability to sense and react to the world around them. This includes monitoring biometric data such as heart rate, the environmental factors such as temperature and The presence of toxic gases producing real time feedback in the form of electrical stimuli, haptic feedback or changes in color. The report identifies three distinct generations of textile wearable technologies: Third generation wearables represent a significant opportunity for new and established textile companies to add significant value without having to directly compete with Apple, Samsung and Intel. The report predicts that the key growth areas will be initially sports and wellbeing followed by medical applications for patient monitoring and fashion. Technical textiles, fashion and entertainment will also be significant applications with the total market expected to rise to over $100 billion by 2025 with triple digit compound annual growth rates across many applications. The rise of textile wearables also represents a significant opportunity for manufacturers of the advanced materials used in their manufacture. Toray, Panasonic, Covestro, DuPont and Toyobo are already suppling the necessary materials, while researchers are creating sensing and energy storage technologies, from flexible batteries to graphene supercapacitors which will power tomorrows wearables. The report examines the markets, details the latest advances and their applications. Key Topics Covered: 1. Introduction How to Use This Report Wearable Technologies and the 4Th Industrial Revolution The Evolution of Wearable Technologies Defining Smart Textiles Factors Affecting The Adoption of Smart Textiles - Cost - Accuracy - On Shoring - Power management - Security and Privacy 2. Markets Total Market Growth and CAGR Market Growth By Application Adding Value To Textiles Through Technology How Nanomaterials Add Functionality and Value Business Models 3. Applications Clothing and Apparel Nano-Antibacterial Clothing Textiles - Silver Nanoparticles - Nanosilver Safety Concerns - Zinc/Copper/Doped Zinc Oxides - UV/Sun/Radiation Protection - Hassle-free Clothing: Stain/Oil/Water Repellence, Anti-Static, Anti-Wrinkle Anti-Fade - Comfort Issues: Perspiration Control, Moisture Management - Creative Appearance and Scent for High Street Fashions - Anti-Counterfeiting Current Adopters of Nanotechnology in Clothing/Apparel Textiles 4. Sports and Wellbeing 1st Generation Technologies - Under Armour Healthbox Wearables - Adidas MiCoach - Sensoria - EMPA's Long Term Research 2nd Generation Technologies - Google's Project Jacquard - Samsung Creative Lab - Microsoft Collaborations - Intel Systems on a Chip - Flex (Formerly Flextronics) and MAS Holdings - Jiobit - Asensei Personal Trainer - OmSignal Smart Clothing - Ralph Lauren PoloTech - Hexoskin Performance Management - Jabil Circuit Textile Heart Monitoring - Stretch Sense Sensors - NTT Data and Toray - Goldwin Incand DoCoMo - SupaSpot Inc Smart Sensors - Wearable Experiments and Brand Marketing - Wearable Life Sciences Antelope - Textronics NuMetrex 3rd Generation Technologies - AdvanPro Pressure Sensing Shoes - Tamicare 3D printed Wearables with Integrated Sensors - AiQ Smart Clothing Stainless Steel Yarns - Flex Printed Inks And Conductive Yarns - Sensing Tech Conductive Inks - EHO Textiles Body Motion Monitoring - Bebop Sensors Washable E-Ink Sensors - Fraunhofer Institute for Silicate Research Piezolectric Polymer Sensors - CLIM8 GEAR Heated Textiles - VTT Smart Clothing Human Thermal Model - ATTACH (Adaptive Textiles Technology with Active Cooling and Heating) 4. Energy Storage and Generation Intelligent Textiles Military Uniforms - BAE Systems Broadsword Spine - Stretchable Batteries - LG Chem Cable Batteries Supercapacitors - Swinburne Graphene Supercapacitors - MIT Niobium Nanowire Supercapacitors 5. Energy Harvesting Kinetic - StretchSense Energy Harvesting Kit - NASA Environmental Sensing Fibers Solar - Powertextiles - Sphelar Power Corp Solar Textiles - Ohmatex and Powerweave 6. Fashion 1st Generation Technologies Cute Circuit LED Couture MAKEFASHION LED Couture 2nd Generation Technologies Covestro Luminous Clothing 3rd Generation Technologies - The Unseen Temperature Sensitive Dyes - Entertainment - Wearable Experiments Marketing 7. Key Technologies Circuitry - Conductive Inks for Fabrics - Conductive Ink For Printing On Stretchable Fabrics - Creative Materials Conductive Inks And Adhesives - Dupont Stretchable Electronic Inks - Aluminium Inks From Alink Co Conductive Fibres - Circuitex Silver Coated Nylon - Textronics Yarns and Fibres - Novonic Elastic Conductive Yarn - Copper Coated Polyacrylonitrile (PAN) Fibres Printed electronics - Covestro TPU Films for Flexible Circuits 8. Sensors Electrical - Hitoe - Cocomi - Panasonic Polymer Resin - Cardiac Monitoring 9. Mechanical Strain - Textile-Based Weft Knitted Strain Sensors - Chain Mail Fabric for Smart Textiles - Nano-Treatment for Conductive Fiber/Sensors - Piezoceramic materials - Graphene-Based Woven Fabric Pressure Sensing - LG Innotek Flexible Textile Pressure Sensors - Hong Kong Polytechnic University Pressure Sensing Fibers - Conductive Polymer Composite Coatings - Printed Textile Sensors To Track Movement 10. Environment - Photochromic Textiles - Temperature Sefar PowerSens - Gasses & Chemicals Textile Gas Sensors 11. Energy Storage - Graphene Supercapacitors - Niobium Nanowire Supercapacitors - Stretchy supercapacitors Energy Generation - StretchSense Energy Harvesting Kit - Piezoelectric Or Thermoelectric Coated Fibres 12. Optical Light Emitting - University of Manchester Electroluminescent Inks and Yarns - Polyera Wove Companies Mentioned - Adidas - AdvanPro Limited - AIQ - ALATEX - Alink Co., Ltd - Alphabet - Analog Devices - Athos - Baar - BAE Systems - Barclays - BeBop Sensors - Bischoff Textil AG, - Bonar Technical Fabrics NV - Borgstena Group - Chromat - Cintas - Clothing+ - Covestra - Creative Materials - Cute Circuit - Cyanine Technologies srl. - DuPont - Durex - EHO Textiles - Endomondo - ETH Zurich, Wearable Computing Lab - Flex - Forster Rohner - Foster Rohner - Fraunhofer Institute for Silicate Research - Goldwin Inc. - Google - Heddoko - Huenenberg - IMEC - Intel - Intelligent Textiles Ltd - JabilCircuit - King's Metal Fiber Technologies - Konarka - Levi's - LG Chem - LG Innotek - Lindstrand Technologies - Lumo Bodytech - Lyle & Scott - Makefashion - MapMyRun - MAS Holdings - Medical Engineering Lab; - Microsoft - Noble Biomaterials Inc - Novonic - NTB Buchs - NTT Corporation - Odlo International AG - Ohmatex - Panasonic - Peerless Plastics & Coatings Ltd - PLUX - PolarBeat - Polyera - Powertextiles Limited - Ralph Lauren - Schiller AG - Sefar AG - Sensing Tech S.L. - Sensoglove - Sensoria - Serge Ferrari SA - Sphelar Power - St. Gallen - StartToday - Steinhausen - Strava, - Strela Development AG - StretchSense - SUPA - SupaSpot Inc - Swarovski - Swiss Textile School STF - Tamicare - Tex Ray Group - Textronics - The Unseen - Toray Industries - Toyobo Co Ltd - TWI - Umicore Materials AG - Unaxis Balzers AG - Under Armour - Unico Swiss Tex GmbH - VDS Weaving NV. - VTT Research Centre Finland - W. Zimmermann GmbH & Co. KG - Wearable Experiments - Wearable Life Sciences - Xotox - Zietromec - ZOZOTOWN For more information about this report visit http://www.researchandmarkets.com/research/fw5b73/smart_textiles_in


Dublin, April 18, 2017 (GLOBE NEWSWIRE) -- Research and Markets has announced the addition of the "Smart Textiles in Apparel: Markets, Applications and Technologies" report to their offering. This new report 'Smart Textiles in Apparel: Markets, Applications and Technologies' examines the markets for textile based wearable technologies, the companies producing them and the enabling technologies. This is creating a 4th industrial revolution for the textiles and fashion industry worth over $100 billion by 2025. Advances in fields such as nanotechnology, organic electronics (also known as plastic electronics) and conducting polymers are creating a range of textile-based technologies with the ability to sense and react to the world around them. This includes monitoring biometric data such as heart rate, the environmental factors such as temperature and The presence of toxic gases producing real time feedback in the form of electrical stimuli, haptic feedback or changes in color. The report identifies three distinct generations of textile wearable technologies: Third generation wearables represent a significant opportunity for new and established textile companies to add significant value without having to directly compete with Apple, Samsung and Intel. The report predicts that the key growth areas will be initially sports and wellbeing followed by medical applications for patient monitoring and fashion. Technical textiles, fashion and entertainment will also be significant applications with the total market expected to rise to over $100 billion by 2025 with triple digit compound annual growth rates across many applications. The rise of textile wearables also represents a significant opportunity for manufacturers of the advanced materials used in their manufacture. Toray, Panasonic, Covestro, DuPont and Toyobo are already suppling the necessary materials, while researchers are creating sensing and energy storage technologies, from flexible batteries to graphene supercapacitors which will power tomorrows wearables. The report examines the markets, details the latest advances and their applications. Key Topics Covered: 1. Introduction How to Use This Report Wearable Technologies and the 4Th Industrial Revolution The Evolution of Wearable Technologies Defining Smart Textiles Factors Affecting The Adoption of Smart Textiles - Cost - Accuracy - On Shoring - Power management - Security and Privacy 2. Markets Total Market Growth and CAGR Market Growth By Application Adding Value To Textiles Through Technology How Nanomaterials Add Functionality and Value Business Models 3. Applications Clothing and Apparel Nano-Antibacterial Clothing Textiles - Silver Nanoparticles - Nanosilver Safety Concerns - Zinc/Copper/Doped Zinc Oxides - UV/Sun/Radiation Protection - Hassle-free Clothing: Stain/Oil/Water Repellence, Anti-Static, Anti-Wrinkle Anti-Fade - Comfort Issues: Perspiration Control, Moisture Management - Creative Appearance and Scent for High Street Fashions - Anti-Counterfeiting Current Adopters of Nanotechnology in Clothing/Apparel Textiles 4. Sports and Wellbeing 1st Generation Technologies - Under Armour Healthbox Wearables - Adidas MiCoach - Sensoria - EMPA's Long Term Research 2nd Generation Technologies - Google's Project Jacquard - Samsung Creative Lab - Microsoft Collaborations - Intel Systems on a Chip - Flex (Formerly Flextronics) and MAS Holdings - Jiobit - Asensei Personal Trainer - OmSignal Smart Clothing - Ralph Lauren PoloTech - Hexoskin Performance Management - Jabil Circuit Textile Heart Monitoring - Stretch Sense Sensors - NTT Data and Toray - Goldwin Incand DoCoMo - SupaSpot Inc Smart Sensors - Wearable Experiments and Brand Marketing - Wearable Life Sciences Antelope - Textronics NuMetrex 3rd Generation Technologies - AdvanPro Pressure Sensing Shoes - Tamicare 3D printed Wearables with Integrated Sensors - AiQ Smart Clothing Stainless Steel Yarns - Flex Printed Inks And Conductive Yarns - Sensing Tech Conductive Inks - EHO Textiles Body Motion Monitoring - Bebop Sensors Washable E-Ink Sensors - Fraunhofer Institute for Silicate Research Piezolectric Polymer Sensors - CLIM8 GEAR Heated Textiles - VTT Smart Clothing Human Thermal Model - ATTACH (Adaptive Textiles Technology with Active Cooling and Heating) 4. Energy Storage and Generation Intelligent Textiles Military Uniforms - BAE Systems Broadsword Spine - Stretchable Batteries - LG Chem Cable Batteries Supercapacitors - Swinburne Graphene Supercapacitors - MIT Niobium Nanowire Supercapacitors 5. Energy Harvesting Kinetic - StretchSense Energy Harvesting Kit - NASA Environmental Sensing Fibers Solar - Powertextiles - Sphelar Power Corp Solar Textiles - Ohmatex and Powerweave 6. Fashion 1st Generation Technologies Cute Circuit LED Couture MAKEFASHION LED Couture 2nd Generation Technologies Covestro Luminous Clothing 3rd Generation Technologies - The Unseen Temperature Sensitive Dyes - Entertainment - Wearable Experiments Marketing 7. Key Technologies Circuitry - Conductive Inks for Fabrics - Conductive Ink For Printing On Stretchable Fabrics - Creative Materials Conductive Inks And Adhesives - Dupont Stretchable Electronic Inks - Aluminium Inks From Alink Co Conductive Fibres - Circuitex Silver Coated Nylon - Textronics Yarns and Fibres - Novonic Elastic Conductive Yarn - Copper Coated Polyacrylonitrile (PAN) Fibres Printed electronics - Covestro TPU Films for Flexible Circuits 8. Sensors Electrical - Hitoe - Cocomi - Panasonic Polymer Resin - Cardiac Monitoring 9. Mechanical Strain - Textile-Based Weft Knitted Strain Sensors - Chain Mail Fabric for Smart Textiles - Nano-Treatment for Conductive Fiber/Sensors - Piezoceramic materials - Graphene-Based Woven Fabric Pressure Sensing - LG Innotek Flexible Textile Pressure Sensors - Hong Kong Polytechnic University Pressure Sensing Fibers - Conductive Polymer Composite Coatings - Printed Textile Sensors To Track Movement 10. Environment - Photochromic Textiles - Temperature Sefar PowerSens - Gasses & Chemicals Textile Gas Sensors 11. Energy Storage - Graphene Supercapacitors - Niobium Nanowire Supercapacitors - Stretchy supercapacitors Energy Generation - StretchSense Energy Harvesting Kit - Piezoelectric Or Thermoelectric Coated Fibres 12. Optical Light Emitting - University of Manchester Electroluminescent Inks and Yarns - Polyera Wove Companies Mentioned - Adidas - AdvanPro Limited - AIQ - ALATEX - Alink Co., Ltd - Alphabet - Analog Devices - Athos - Baar - BAE Systems - Barclays - BeBop Sensors - Bischoff Textil AG, - Bonar Technical Fabrics NV - Borgstena Group - Chromat - Cintas - Clothing+ - Covestra - Creative Materials - Cute Circuit - Cyanine Technologies srl. - DuPont - Durex - EHO Textiles - Endomondo - ETH Zurich, Wearable Computing Lab - Flex - Forster Rohner - Foster Rohner - Fraunhofer Institute for Silicate Research - Goldwin Inc. - Google - Heddoko - Huenenberg - IMEC - Intel - Intelligent Textiles Ltd - JabilCircuit - King's Metal Fiber Technologies - Konarka - Levi's - LG Chem - LG Innotek - Lindstrand Technologies - Lumo Bodytech - Lyle & Scott - Makefashion - MapMyRun - MAS Holdings - Medical Engineering Lab; - Microsoft - Noble Biomaterials Inc - Novonic - NTB Buchs - NTT Corporation - Odlo International AG - Ohmatex - Panasonic - Peerless Plastics & Coatings Ltd - PLUX - PolarBeat - Polyera - Powertextiles Limited - Ralph Lauren - Schiller AG - Sefar AG - Sensing Tech S.L. - Sensoglove - Sensoria - Serge Ferrari SA - Sphelar Power - St. Gallen - StartToday - Steinhausen - Strava, - Strela Development AG - StretchSense - SUPA - SupaSpot Inc - Swarovski - Swiss Textile School STF - Tamicare - Tex Ray Group - Textronics - The Unseen - Toray Industries - Toyobo Co Ltd - TWI - Umicore Materials AG - Unaxis Balzers AG - Under Armour - Unico Swiss Tex GmbH - VDS Weaving NV. - VTT Research Centre Finland - W. Zimmermann GmbH & Co. KG - Wearable Experiments - Wearable Life Sciences - Xotox - Zietromec - ZOZOTOWN For more information about this report visit http://www.researchandmarkets.com/research/fw5b73/smart_textiles_in


Zhu Z.,Hong Kong Polytechnic University | To S.,Hong Kong Polytechnic University | To S.,Guangdong University of Technology
Optics Express | Year: 2015

Fast tool servo/ slow tool servo (FTS/STS) diamond turning is a very promising technique for the generation of freeform optics. However, the currently adopted constant scheme for azimuth sampling and side-feeding motion possesses no adaptation to surface shape variation, leading to the non-uniform surface quality and low machining efficiency. To overcome this defect, this paper reports on a novel adaptive tool servo (ATS) diamond turning technique which is essentially based on the novel two-degree-of-freedom (2-DOF) FTS/STS. In the ATS, the sampling interval and the side-feeding motion are actively controlled at any cutting point to adapt the machining process to shape variation of the desired surface, making both the sampling induced interpolation error and the side-feeding induced residual tool mark be within the desired tolerances. Characteristic of the required cutting motion suggests that besides the conventional z-axis servo motion, another servo motion along the x-axis synthesizing by the c-axis is mandatory for implementing the ATS. Comparative studies of surface generation of typical micro-structured surfaces in FTS/STS and ATS are thoroughly conducted both theoretically and experimentally. The result demonstrates that the ATS outperforms the FTS/STS with improved surface quality while simultaneously enhanced machining efficiency. ©2015 Optical Society of America.


Tsang M.M.Y.,Castle Peak Hospital | Man D.W.K.,Hong Kong Polytechnic University
Schizophrenia Research | Year: 2013

Employment provides schizophrenic patients with a positive identity and hope. Cognitive impairments have been suggested to slow down the progress in work rehabilitation. The purpose of this study was to investigate the efficacy and effectiveness of VR as a cognitive intervention for enhancing vocational outcomes. 95 inpatients with schizophrenia were randomly assigned to a virtual reality-based vocational training group (VRG), a therapist-administered group (TAG) and a conventional group (CG). Twenty-five of them in each group had completed the study. Their performances were evaluated, before and after interventions, by Brief Neuropsychological Cognitive Examination, Digit Vigilance Test, Rivermead Behavioural Memory Test, Wisconsin Card Sorting Test (WCST) and Vocational Cognitive Rating Scale. Patients in the VRG were found to perform better than patients in the TAG and CG in cognitive functioning, as shown by the WCST-percentage of error (F (2, 72) = 7.146, p. <. 0.001) and the WCST-percentage of conceptual level response (F (2, 72) = 8.722, p. <. 0.001). The post-hoc test revealed that the VRG showed a better performance than both the TAG (p = 0.03) and the CG (p. <. 0.001) in the WCST-percentage of error. The VRG also showed a better performance than patients in both the TAG (p = 0.01) and the CG (p. <. 0.001) in the WCST-percentage of conceptual level response. The VRG also showed a better self-efficacy score than CG. Both VRG and TAG showed a better work performance as reflected by the on-site tests. Further studies on the use of VR in schizophrenia rehabilitation and for vocational success are discussed. © 2013 Elsevier B.V.


Ming Z.,Tsinghua National Laboratory for Information Sciences and Technology | Xu M.,Tsinghua National Laboratory for Information Sciences and Technology | Wang D.,Hong Kong Polytechnic University
Proceedings - IEEE INFOCOM | Year: 2012

Information-Centric Networking (ICN) provides substantial flexibility for users to obtain information. One of the most important commonalities of ICN designs is the universal caching. It is widely accepted that the in-network caching would improve performance. However, there has been no consensus on how to design an efficient caching scheme in ICN network. In this paper we propose an age-based cooperative cache scheme aiming at reducing network delay and publisher load for ICN network. We focus on light-weight collaboration mechanisms that spread popular contents to the network edge while at the same time fully utilize the storage capacity of intermediate nodes. We evaluate the effectiveness of our scheme under real traces and realistic network topology. The results indicate that our scheme achieves significant performance gains. © 2012 IEEE.


Kou S.-C.,Hong Kong Polytechnic University | Poon C.-S.,Hong Kong Polytechnic University
Cement and Concrete Composites | Year: 2011

This paper presents the results of a study of the long term mechanical properties and pore structures of recycled aggregate concrete. In this study, two different sources of recycled aggregates were used to replace natural aggregate at a level of 100%. The compressive and splitting tensile strength of the concrete were tested, and the pore structures of the concrete were analyzed. The results showed that after 5 years of curing, the recycled aggregate concretes had lower compressive strength and higher splitting tensile strength than the corresponding natural aggregate concrete. However, from 28 days to 5 years, the increase of compressive and splitting tensile strengths was more in the recycled aggregate concretes. After 5 years of curing, the concrete made with 100% of crushed old concrete aggregate had the lowest porosity. Good correlations were found between compressive and tensile strength and porosity. © 2010 Elsevier Ltd. All rights reserved.


Lee S.,National University of Singapore | Zhang R.,National University of Singapore | Zhang R.,Institute for Infocomm Research | Huang K.,Hong Kong Polytechnic University
IEEE Transactions on Wireless Communications | Year: 2013

Wireless networks can be self-sustaining by harvesting energy from ambient radio-frequency (RF) signals. Recently, researchers have made progress on designing efficient circuits and devices for RF energy harvesting suitable for low-power wireless applications. Motivated by this and building upon the classic cognitive radio (CR) network model, this paper proposes a novel method for wireless networks coexisting where low-power mobiles in a secondary network, called secondary transmitters (STs), harvest ambient RF energy from transmissions by nearby active transmitters in a primary network, called primary transmitters (PTs), while opportunistically accessing the spectrum licensed to the primary network. We consider a stochastic-geometry model in which PTs and STs are distributed as independent homogeneous Poisson point processes (HPPPs) and communicate with their intended receivers at fixed distances. Each PT is associated with a guard zone to protect its intended receiver from ST's interference, and at the same time delivers RF energy to STs located in its harvesting zone. Based on the proposed model, we analyze the transmission probability of STs and the resulting spatial throughput of the secondary network. The optimal transmission power and density of STs are derived for maximizing the secondary network throughput under the given outage-probability constraints in the two coexisting networks, which reveal key insights to the optimal network design. Finally, we show that our analytical result can be generally applied to a non-CR setup, where distributed wireless power chargers are deployed to power coexisting wireless transmitters in a sensor network. © 2013 IEEE.


Choi T.-M.,Hong Kong Polytechnic University | Sethi S.,University of Texas at Dallas
International Journal of Production Economics | Year: 2010

The quick response (QR) supply chain system has received a great deal of attention in the recent past because of the advances in many new technologies such as RFID systems and mobile computing. Establishment of supply chain practices, such as collaborative planning, forecasting, and replenishment (CPFR), and vendor managed inventory (VMI) has also contributed to the development of QR in industrial practice. In view of the growing importance of QR, we review a selection of papers in the supply chain management literature that focus on the innovative measures associated with QR. By classifying the literature into three major areas, namely, supply information management, demand information management, and values of information and supporting technologies, we derive insights into the current state of knowledge in each area and identify some associated challenges. We also suggest future research directions. In conclusion, this paper provides useful information in helping academicians and practitioners to effectively design, control, and implement QR programs. © 2010 Elsevier B.V. All rights reserved.


Chen S.-H.,Nanhua University | Chang P.-C.,Yuan Ze University | Cheng T.C.E.,Hong Kong Polytechnic University | Zhang Q.,University of Essex
Computers and Operations Research | Year: 2012

In this paper we develop a Self-guided Genetic Algorithm (Self-guided GA), which belongs to the category of Estimation of Distribution Algorithms (EDAs). Most EDAs explicitly use the probabilistic model to sample new solutions without using traditional genetic operators. EDAs make good use of the global statistical information collected from previous searches but they do not efficiently use the location information about individual solutions. It is recently realized that global statistical information and location information should complement each other during the evolution process. In view of this, we design the Self-guided GA based on a novel strategy to combine these two kinds of information. The Self-guided GA does not sample new solutions from the probabilistic model. Instead, it estimates the quality of a candidate offspring based on the probabilistic model used in its crossover and mutation operations. In such a way, the mutation and crossover operations are able to generate fitter solutions, thus improving the performance of the algorithm. We tested the proposed algorithm by applying it to deal with the NP-complete flowshop scheduling problem to minimize the makespan. The experimental results show that the Self-guided GA is very promising. We also demonstrate that the Self-guided GA can be easily extended to treat other intractable combinatorial problems. © 2011 Elsevier Ltd. All rights reserved.


Chang R.C.Y.,Providence University | Kivela J.,Hong Kong Polytechnic University | Mak A.H.N.,University of Surrey
Annals of Tourism Research | Year: 2010

Given the scarcity of research on tourist food preference, this study is a first attempt to generate in-depth understanding of Chinese tourists' food preferences in a culturally different environment by employing on-site participant observations and focus group interviews. It provides a detailed analysis of the motivational factors underlying the Chinese participants' food preferences when holidaying in Australia, and also proposes a typology that describes and contrasts the participants' tourism dining attitudes, motivations and behaviors. Furthermore, this study elucidates the influence of Chinese food culture on the participants' tourism dining behaviors and explores the disparities in dining behavioral patterns between the participants in terms of their dining motivations and the way they related tourism dining experiences to their daily experiences. © 2010 Elsevier Ltd.


Chang R.C.Y.,Providence University | Kivela J.,Hong Kong Polytechnic University | Mak A.H.N.,University of Surrey
Tourism Management | Year: 2011

Many destination marketers have utilized gastronomy as a source of new products and activities to attract tourists. Despite the substantial rise in the Chinese outbound market, very little is known about how Chinese tourists evaluate their travel dining experiences. By using narrative analysis, this study examines attributes that may affect Chinese tourists' evaluation of their travel dining experiences. On-site participant observation and focus group interviews were conducted, respectively, with Mainland Chinese, Taiwanese, and Hong Kong group tourists, while they were on holiday in Australia. A total of 15 attributes were identified, which were classified under the following six categories: tourists' own food culture, the contextual factor of the dining experience, variety and diversity of food, perception of the destination, service encounter, and tour guide's performance. The respective implications of the attributes on travel dining experience are also discussed. © 2010 Elsevier Ltd.


Guo J.,China Institute of Technology | Chen S.,Hong Kong Polytechnic University
Protein Expression and Purification | Year: 2015

Botulinum neurotoxins are the most potent protein toxins known to human. To date, seven subtypes of the BoNT/F serotype (BoNT/F1 to BoNT/F7) have been identified, among which BoNT/F5 and BoNT/F7 are the most divergent. However, little structural and functional information is available for these two subtypes due to a lack of suitable recombinant proteins for biochemical characterization, except that they appear to possess unique substrate recognition mechanisms, thereby impeding development of vaccine or inhibitors against these proteins. In the present study, we utilized a combinatorial approach which involved examining the effects of different affinity tags, mapping C-terminal truncation mutants and optimization of expression and purification conditions, that allowed us to successfully express and purify soluble and highly active recombinant LC/F5 and LC/F7 proteins. GST-LC/F5(1-450) and 6× His-LC/F5(1-405) were the formats which exhibit the highest level of solubility and activity, whereas GST-LC/F7(1-405) was the most active form of LC/F7. In comparison, GST-LC/F5(1-450) was more active than GST-LC/F7(1-405), which was in turn more active than the LC/F1 control. Our data suggest that solubility of these proteins strongly correlated with their catalytic activity. Successful expression and purification of LC/F5 and LC/F7 in this work will, for the first time, provide materials for further characterization of these two subtypes of BoNT/F, which is essential for future development of protective vaccine or other therapeutic strategies, as well as BoNT/F protein engineering. © 2015 Elsevier Inc. All rights reserved.


Choi T.-M.,Hong Kong Polytechnic University | Li Y.,Nankai University | Xu L.,Tianjin University of Technology
International Journal of Production Economics | Year: 2013

The business values of product remanufacturing have been well-recognized in the literature. Companies have also increasingly realized the importance of coordinating the closed-loop supply chains (CLSCs) with both manufacturing and re-manufacturing processes. In this paper, we investigate a CLSC which consists of a retailer, a collector, and a manufacturer, and examine the performance of different CLSC under different channel leadership. Through a systematic comparison, we find that the retailer-led model gives the most effective CLSC. Moreover, we analytically reveal that the remanufacturing system's efficiency is highly related to a supply chain agent's proximity to the market. Counter-intuitively, we show that the collector-led model is not the most effective model for collecting the used-product. We finally illustrate how both the serial and parallel CLSCs can be coordinated by using different kinds of practical contracts. © 2013 Elsevier B.V.


Chen D.,Zhejiang Normal University | Tam H.Y.,Hong Kong Polytechnic University
Journal of Lightwave Technology | Year: 2010

A kind of novel highly birefringent terahertz (THz) fibers based on super-cell structure, which has the advantage of minimizing the structural distortion during fabrication is proposed. The dielectric material (such as polymer) with airholes and the surrounding air are used as the fiber core and the fiber cladding, respectively. Uniform airholes with the diameter that is much smaller than the operation wavelength are used to form the basic cell. Two typical highly birefringent THz fibers with cross sections of the diamond-shaped and the dumbbell-shaped cells are introduced and investigated, respectively. High birefringence up to the order of 0.01 is achieved, and the power distributions of the modal power and the relative absorption loss of the proposed THz fibers are also investigated. The proposal for the THz fibers based on super-cell structure indicates a method to achieve unique property as the THz fibers with complex cross section. © 2006 IEEE.


Cheng T.C.E.,Hong Kong Polytechnic University | Chung Y.-H.,National Chiao Tung University | Liao S.-C.,Feng Chia University | Lee W.-C.,Feng Chia University
Computers and Operations Research | Year: 2013

In many management situations multiple agents pursuing different objectives compete on the usage of common processing resources. In this paper we study a two-agent single-machine scheduling problem with release times where the objective is to minimize the total weighted completion time of the jobs of one agent with the constraint that the maximum lateness of the jobs of the other agent does not exceed a given limit. We propose a branch-and-bound algorithm to solve the problem, and a primary and a secondary simulated annealing algorithm to find near-optimal solutions. We conduct computational experiments to test the effectiveness of the algorithms. The computational results show that the branch-and-bound algorithm can solve most of the problem instances with up to 24 jobs in a reasonable amount of time and the primary simulated annealing algorithm performs well with an average percentage error of less than 0.5% for all the tested cases. © 2012 Elsevier Ltd. All rights reserved.


Patent
University of Macau and Hong Kong Polytechnic University | Date: 2012-10-25

The present invention provides a method of using indole-ketone or indolidone to treat or prevent a neurodegenerative disease or disorder. In one embodiment, the neurodegenerative disease is Parkinsons disease. In another embodiment, the neurodegenerative disease or disorder is associated with excessive neuronal Nitric Oxide Synthase (nNOS) activity. Examples of indole-ketone include, but are not limited to, SU4312, SU5416, SU11248 (Sunitinib), and indirubin-3-oxime.


News Article | December 28, 2016
Site: www.cemag.us

The year 2016 has seen the deaths of many celebrities from the world of entertainment … Prince, David Bowie, Gwen Ifill, Florence Henderson, Muhammad Ali, and just this week we lost George Michael and Carrie Fischer. We’ve also had to bid farewell to many scientists and innovators this year. Here are just a few of those we lost in 2016 — we thank them for their significant contributions to science and technology. Marvin Minsky, a pioneer in the field of artificial intelligence, died on Jan. 24. The MIT computer science instructor laid the groundwork for AI when he demonstrated the possibilities of imparting common-sense reasoning to computers. Starting in the 1950s, he studied computational ideas in order to characterize human psychological processes. He then came up with theories on machines could be endowed with intelligence. He co-founded the MIT Artificial Intelligence Project (later the Artificial Intelligence Laboratory) in 1959. Edgar Mitchell, the lunar module pilot on Apollo 14, died on Feb. 4. He was the sixth man to walk on the moon (out of just 12 total). Mitchell and Alan Shephard Jr., the first American in space, touched down on the moon on Feb. 5, 1971, in order to travel on the lunar surface to deploy scientific instruments and perform a communications test. Mitchell spent 33 hours on the surface of the moon. The Apollo 14 mission was his only time in space. Ray Tomlinson, the man who invented email and selected the @ symbol for use in email addresses, died on March 5. Tomlinson invented a program for ARPANET, the Internet’s predecessor, in 1971 — the program enabled people to send personal messages to other computer users on other servers. The @ symbol was chosen for email addresses because Tomlinson deduced that the symbol would not otherwise be part of the address — some say the symbol may have faded out of use entirely had it not been for him. Zaha Hadid, a groundbreaking architect from Britain by way of Iraq, died on March 31. Her designs, experts note, were not pigeonholed by her background or her gender. She became the first woman to win the Pritzker Prize, “architecture’s Nobel,” in 2004, and the first on her own merit to be awarded the RIBA Gold Medal, Britain’s top architectural award, in 2015. Her science-related designs include the Phaeno Science Center in Germany, Maggie's Centres at the Victoria Hospital in Scotland, and Innovation Tower at Hong Kong Polytechnic University. She also designed the London Aquatics Centre for the 2012 Olympics. Dr. Gordon Hamilton, a climate scientist who studied glaciers and their impact on sea levels in a warming climate, died Oct. 22. He perished in a snowmobile accident in Antarctica. Hamilton traveled to the Antarctic each winter and to Greenland each summer, to study the behavior of modern ice sheets and their role in the climate system and modulating global sea levels. “The things I’ve seen in Greenland in the last five years are alarming,” Hamilton said to the The New York Times six years ago. “We see these ice sheets changing literally overnight.” He was a professor at the University of Maine. Dr. Piers Sellers, a climate change scientist and former NASA astronaut, died on Dec. 23. He served as the acting director of the Earth Sciences Division at NASA's Goddard Space Flight Center in Greenbelt, Md. After learning he had terminal pancreatic cancer, Sellers devoted the rest of his life to confronting the challenges of climate change, as he noted during his appearance in Leonardo DiCaprio's climate change documentary Before the Flood. John Glenn, a former NASA astronaut and U.S. Senator, died on Dec. 8. Glenn was one of NASA's original seven Mercury astronauts, and became the first American to orbit the earth when he flew on the Friendship 7 on Feb. 20, 1962. The astronaut faced life-threatening problems when the spacecraft’s automatic control system malfunctioned and its heat shield loosened, but Glenn made it safely back to Earth and was hailed as a national hero. Glenn returned to space at age 77 — he spent 9 days on the space shuttle Discovery in 1998, where he participated in a series of tests on the aging process. Dr. Edwin Goldwasser, a physicist who co-founded the Fermi National Accelerator Laboratory, died Dec. 14. Goldwasser persuaded President Lyndon Johnson to establish a high-flight research facility in Illinois in order to attract more physics students to the Midwest. During the 1960s Goldwasser became the deputy director for what became known as Fermilab in Batavia, Ill., which does particle physics research and has contributed to major discoveries in medicine, energy, and the origins of the universe. During the Cold War he convinced President Richard Nixon to permit scientific exchanges with Soviet physicists. When the Soviets refused to invite the recommended number of Israeli physicists to an international meeting in the present-day country of Georgia, Goldwasser threatened to cancel the meeting — the Soviets gave in. Vera Rubin, who discovered evidence of dark matter, died on Dec. 25. The astrophysicist, who was elected to the National Academy of Sciences and awarded the National Medal of Science, was the first woman allowed to observe at Caltech's Palomar Observatory. Turned away by Princeton University, Rubin instead studied at Cornell and Georgetown — she began her Ph.D. program at the age of 23, while pregnant and also caring for another young child at home. Image Credit: Piers Sellers most recently served as the deputy director of the Sciences and Exploration Directorate and acting director of the Earth Sciences Division at NASA’s Goddard Space Flight Center in Greenbelt, Md. Image: NASA/Rebecca Roth


News Article | March 21, 2016
Site: news.mit.edu

Researchers at MIT and other institutions have found a new phenomenon in the behavior of a kind of quasiparticles called plasmons as they move along tiny ribbons of two-dimensional materials such as graphene and TMDs (transition metal dichalcogenides), which have a hexagonal structure resembling chicken wire. The team found that these plasmons can be separated into two different streams moving in opposite directions at the edges of the ribbons, like traffic on a two-lane highway, without the need for strong magnetic fields or other exotic conditions. The new research was carried out by MIT associate professor of mechanical engineering Nicholas X. Fang, recent PhD graduate from that department Anshuman Kumar, and four other researchers from the University of Wisconsin at Milwaukee, Hong Kong Polytechnic University, and the University of Minnesota. The work was reported in a paper in the journal Physical Review B. Other groups had previously observed such separated flows, Fang says, but that previous work required the use of powerful magnetic fields. Instead, the new process relies largely on optical effects, he says, using beams of circularly polarized light. The findings are based on exotic states of matter that can occur in two-dimensional materials that, unlike graphene, have a characteristic known as a bandgap, necessary for devices such as transistors or solar cells (and also in graphene that is modified to have a bandgap). These states of matter are based on quantum physics phenomena such as Berry curvature, which occur in configurations known as massive Dirac systems. Although such systems are a hot area of research these days, the researchers say this particular class of phenomena, involving surface electromagnetic properties known as surface plasmons, has been relatively unexplored until now. In the new work, the team showed that shining beams of circularly polarized light onto the graphene ribbons causes electrons in the material to cluster into two different “valleys” in the electronic band structure. The peculiar symmetry properties of this system gives rise to a phenomenon called Berry curvature, which can be thought of as an artificial magnetic field. Under these conditions, these valleys correspond to motions of the plasmons — which are a kind of oscillation of electron density in the material — in opposite directions on the two edges of the material. The graphene ribbons are just 50 nanometers (billionths of a meter) in width. This effective magnetic field can be measured by sending in a second polarized beam, whose transmission can then be detected so that the changes in its polarization give a direct measurement of the effects taking place in the surface plasmons. “This is exciting,” Fang explains, because it opens up a whole new approach to both manipulating the electromagnetic behavior of such systems and measuring the results of these manipulations. This could suggest possibilities for new kinds of electro-optical devices, he says. For example, some experimental photonic systems require devices called optical isolators, which prevent beams of light in precision optical systems from being reflected back to their source and causing interference. But these isolators, which require strong magnetic fields, are inherently bulky, he says, limiting the usefulness of such systems. “With this concept,” he says, “it’s possible to replace these bulky optical isolators with one monolayer of two-dimensional material.” With such a system, Kumar says, it should be possible “to do chip-scale optical isolation without the need for a magnetic field.” To achieve the same degree of optical isolation that this system would provide with a beam of light, Kumar says, with a conventional system would require a magnetic field with a strength of 7 tesla — a very strong field that would require a special research facility. (By comparison, the Earth’s magnetic field measures just 32 millionths of a tesla). Theoretically, this could lead to applications such as new types of memory devices where information could be both written and read by using beams of polarized light, making them relatively immune to electromagnetic or other kinds of interference, the researchers say. “The concept presented in this paper is very interesting and exciting,” says Fengnian Xia, an assistant professor of engineering and science at Yale University, who was not involved in this work. He adds, “In the long run, it may be possible to construct an electrically tunable on-chip isolator based on this concept, which can be a very critical component in integrated optics.” In addition to Fang and Kumar, the team included Andrei Nemilentsau and George Hanson at the University of Wisconsin at Madison, Kin Hung Fung at Hong Kong Polytechnic University, and Tony Low at the University of Minnesota. The work was supported by the National Science Foundation and the Air Force Office of Scientific Research.


News Article | March 21, 2016
Site: www.cemag.us

Researchers at MIT and other institutions have found a new phenomenon in the behavior of a kind of quasiparticles called plasmons as they move along tiny ribbons of two-dimensional materials such as graphene and TMDs (transition metal dichalcogenides), which have a hexagonal structure resembling chicken wire. The team found that these plasmons can be separated into two different streams moving in opposite directions at the edges of the ribbons, like traffic on a two-lane highway, without the need for strong magnetic fields or other exotic conditions. The new research was carried out by MIT associate professor of mechanical engineering Nicholas X. Fang, recent PhD graduate from that department Anshuman Kumar, and four other researchers from the University of Wisconsin at Milwaukee, Hong Kong Polytechnic University, and the University of Minnesota. The work was reported in a paper in the journal Physical Review B. Other groups had previously observed such separated flows, Fang says, but that previous work required the use of powerful magnetic fields. Instead, the new process relies largely on optical effects, he says, using beams of circularly polarized light. The findings are based on exotic states of matter that can occur in two-dimensional materials that, unlike graphene, have a characteristic known as a bandgap, necessary for devices such as transistors or solar cells (and also in graphene that is modified to have a bandgap). These states of matter are based on quantum physics phenomena such as Berry curvature, which occur in configurations known as massive Dirac systems. Although such systems are a hot area of research these days, the researchers say this particular class of phenomena, involving surface electromagnetic properties known as surface plasmons, has been relatively unexplored until now. In the new work, the team showed that shining beams of circularly polarized light onto the graphene ribbons causes electrons in the material to cluster into two different “valleys” in the electronic band structure. The peculiar symmetry properties of this system gives rise to a phenomenon called Berry curvature, which can be thought of as an artificial magnetic field. Under these conditions, these valleys correspond to motions of the plasmons — which are a kind of oscillation of electron density in the material — in opposite directions on the two edges of the material. The graphene ribbons are just 50 nanometers (billionths of a meter) in width. This effective magnetic field can be measured by sending in a second polarized beam, whose transmission can then be detected so that the changes in its polarization give a direct measurement of the effects taking place in the surface plasmons. “This is exciting,” Fang explains, because it opens up a whole new approach to both manipulating the electromagnetic behavior of such systems and measuring the results of these manipulations. This could suggest possibilities for new kinds of electro-optical devices, he says. For example, some experimental photonic systems require devices called optical isolators, which prevent beams of light in precision optical systems from being reflected back to their source and causing interference. But these isolators, which require strong magnetic fields, are inherently bulky, he says, limiting the usefulness of such systems. “With this concept,” he says, “it’s possible to replace these bulky optical isolators with one monolayer of two-dimensional material.” With such a system, Kumar says, it should be possible “to do chip-scale optical isolation without the need for a magnetic field.” To achieve the same degree of optical isolation that this system would provide with a beam of light, Kumar says, with a conventional system would require a magnetic field with a strength of 7 tesla — a very strong field that would require a special research facility. (By comparison, the Earth’s magnetic field measures just 32 millionths of a tesla). Theoretically, this could lead to applications such as new types of memory devices where information could be both written and read by using beams of polarized light, making them relatively immune to electromagnetic or other kinds of interference, the researchers say. “The concept presented in this paper is very interesting and exciting,” says Fengnian Xia, an assistant professor of engineering and science at Yale University, who was not involved in this work. He adds, “In the long run, it may be possible to construct an electrically tunable on-chip isolator based on this concept, which can be a very critical component in integrated optics.” In addition to Fang and Kumar, the team included Andrei Nemilentsau and George Hanson at the University of Wisconsin at Madison, Kin Hung Fung at Hong Kong Polytechnic University, and Tony Low at the University of Minnesota. The work was supported by the National Science Foundation and the Air Force Office of Scientific Research. Source: MIT


News Article | March 23, 2016
Site: www.nanotech-now.com

Home > Press > New way to control particle motions on 2-D materials Abstract: Researchers at MIT and other institutions have found a new phenomenon in the behavior of a kind of quasiparticles called plasmons as they move along tiny ribbons of two-dimensional materials such as graphene and TMDs (transition metal dichalcogenides), which have a hexagonal structure resembling chicken wire. The team found that these plasmons can be separated into two different streams moving in opposite directions at the edges of the ribbons, like traffic on a two-lane highway, without the need for strong magnetic fields or other exotic conditions. The new research was carried out by MIT associate professor of mechanical engineering Nicholas X. Fang, recent PhD graduate from that department Anshuman Kumar, and four other researchers from the University of Wisconsin at Milwaukee, Hong Kong Polytechnic University, and the University of Minnesota. The work was reported in a paper in the journal Physical Review B. Other groups had previously observed such separated flows, Fang says, but that previous work required the use of powerful magnetic fields. Instead, the new process relies largely on optical effects, he says, using beams of circularly polarized light. The findings are based on exotic states of matter that can occur in two-dimensional materials that, unlike graphene, have a characteristic known as a bandgap, necessary for devices such as transistors or solar cells (and also in graphene that is modified to have a bandgap). These states of matter are based on quantum physics phenomena such as Berry curvature, which occur in configurations known as massive Dirac systems. Although such systems are a hot area of research these days, the researchers say this particular class of phenomena, involving surface electromagnetic properties known as surface plasmons, has been relatively unexplored until now. Clustering in "valleys" In the new work, the team showed that shining beams of circularly polarized light onto the graphene ribbons causes electrons in the material to cluster into two different "valleys" in the electronic band structure. The peculiar symmetry properties of this system gives rise to a phenomenon called Berry curvature, which can be thought of as an artificial magnetic field. Under these conditions, these valleys correspond to motions of the plasmons -- which are a kind of oscillation of electron density in the material -- in opposite directions on the two edges of the material. The graphene ribbons are just 50 nanometers (billionths of a meter) in width. This effective magnetic field can be measured by sending in a second polarized beam, whose transmission can then be detected so that the changes in its polarization give a direct measurement of the effects taking place in the surface plasmons. "This is exciting," Fang explains, because it opens up a whole new approach to both manipulating the electromagnetic behavior of such systems and measuring the results of these manipulations. This could suggest possibilities for new kinds of electro-optical devices, he says. For example, some experimental photonic systems require devices called optical isolators, which prevent beams of light in precision optical systems from being reflected back to their source and causing interference. But these isolators, which require strong magnetic fields, are inherently bulky, he says, limiting the usefulness of such systems. "With this concept," he says, "it's possible to replace these bulky optical isolators with one monolayer of two-dimensional material." Chip-scale isolation With such a system, Kumar says, it should be possible "to do chip-scale optical isolation without the need for a magnetic field." To achieve the same degree of optical isolation that this system would provide with a beam of light, Kumar says, with a conventional system would require a magnetic field with a strength of 7 tesla -- a very strong field that would require a special research facility. (By comparison, the Earth's magnetic field measures just 32 millionths of a tesla). Theoretically, this could lead to applications such as new types of memory devices where information could be both written and read by using beams of polarized light, making them relatively immune to electromagnetic or other kinds of interference, the researchers say. ### In addition to Fang and Kumar, the team included Andrei Nemilentsau and George Hanson at the University of Wisconsin at Madison, Kin Hung Fung at Hong Kong Polytechnic University, and Tony Low at the University of Minnesota. The work was supported by the National Science Foundation and the Air Force Office of Scientific Research. For more information, please click If you have a comment, please us. Issuers of news releases, not 7th Wave, Inc. or Nanotechnology Now, are solely responsible for the accuracy of the content.


News Article | December 7, 2016
Site: www.materialstoday.com

Nanoparticles stuck onto the surface of quartz beads offer a simple means of breaking down potentially hazardous organic dyes, according to researchers [Zhou and Srinivasan, Materials Today Chemistry 1-2 (2016) 1-6, http://dx.doi.org/10.1016/j.mtchem.2016.09.001]. The textile industry relies on organic dyes but they are damaging to the environment if discharged, toxic, and non-biodegradable. Before wastewater from textile production plants can be released, treatment to remove organic dyes is essential. Current approaches mostly rely on filtration and absorption, but this creates further – secondary – waste that also has to be treated. As an alternative, scientists are looking for ways to break up organic dyes into smaller, harmless molecules. These so-called degradation reactions require light-activated catalysts to drive the process. Semiconducting materials, particularly TiO , have attracted interest as potential photocatalysts because of their high stability and activity combined with low cost and toxicity. A simple photocatalytic system based on TiO nanoparticles grown on quartz beads could be the answer, according to Ruitao Zhou of the Hong Kong Polytechnic University in China and M. P. Srinivasan of RMIT University in Australia, because it provides a large surface area for reactions to occur, long-term durability, and is self-cleaning. “We invented this technique to avoid the disadvantages of common nanoparticles in catalysis, such as aggregation, blocking by surfactants, difficulties with recycling, and scalability,” explains Zhou. The TiO nanoparticles that form on the surface of the quartz beads have a crystalline core/disordered shell structure. A thin film of the functional polymer 4-methoxycalix arene sticks the nanoparticles onto the quartz surface ensuring that they do not bunch together or become blocked by the organic molecules. The treatment system itself consists of a quartz tube filled with the nanoparticle-covered beads. To demonstrate its capabilities, an organic dye – in this case methyl orange (MO) – was fed into the glass tube. When exposed to visible or UV light, electron-hole pairs generated by the TiO nanoparticles produce radicals (OH•), which break up the dye molecules into smaller species. Zhou and Srinivasan’s photocatalytic setup successfully treated a continuous flow of MO over 140 hours, with activity only showing the first signs of decrease after 120 hours. Moreover, a simple rinse through with de-ionized water for an hour rejuvenates the treatment system. “The TiO nanoparticles could be used for treating water polluted with organic waste,” says Zhou. “Compared with existing approaches, this system can treat polluted water in situ because no secondary waste is generated.” The researchers believe the approach could be easily scaled up and could be applied to the fabrication of other nanostructures.


News Article | November 15, 2016
Site: en.prnasia.com

GUANGZHOU, China, Nov. 15, 2016 /PRNewswire/ -- A groundbreaking ceremony for Guangzhou Infinitus Plaza, constructed on plot No. AB2910019 in Baiyun New Town, Guangzhou, Guangdong Province, China, was held on November 15. The plot of land was acquired by LKK Health Products Group (LKKHPG), through its member Guangdong Infinitus Property Development Company Ltd., in May 2016 for RMB 2.01 billion (approx. USD 294 million). World-leading architect Zaha Hadid, who was known as the "Queen of the Curve", served as the designer of the project. It is the first project among Zaha Hadid's final architectural works to break ground.  Mr. Lee Man Tat, Lee Kum Kee Group Chairman and his wife, Mr. Charlie Lee, Chairman of Lee Kum Kee Sauce Group, Mr. Sammy Lee, Chairman & Managing Director of LKKHPG and his wife, and Mr. Satoshi Ohashi, Director of Zaha Hadid Architects in the Far East, as well as more than 500 distinguished guests and journalists attended the ceremony. Guangzhou Infinitus Plaza will be a complex of modern buildings that combines health, fashion, environmental conservation and intelligent technologies, comprising several facilities including a new global R&D center, a Chinese herbal medicine research and safety assessment center, as well as a corporate exhibition center and gallery. It will serve as the new headquarters of Infinitus (China) Company Ltd., a member of LKKHPG, meeting Infinitus' projected business and office needs for the next 10 to 15 years. The overall investment in the project will reach RMB 4.5 billion (approx. USD 659 million), and the construction is expected to be completed in the second quarter of 2020. "24 years ago, Infinitus started its business in Baiyun District. And today, 24 years later, Infinitus embarks on its new journey here again," said Mr. Harry Yeung, Senior Vice President of LKKHPG. "Guangzhou Infinitus Plaza reflects Infinitus' commitment to the health industry, as well as the spirit of constant entrepreneurship. It will bring customers and employees a dynamic new environment, and drive the economic growth of the Baiyun District and the surrounding areas. " Mr. Satoshi Ohashi enjoyed 30 years of working experience with Zaha Hadid. He said: "Ms. Zaha Hadid gave a high evaluation and expectations of this work. The design of the Guangzhou Infinitus Plaza continues her legacy. As she had referred, this fluidity of the architecture had the coherence and intricacy of nature. Infinitus has a vision for nurturing healthier lives, and adheres to the Spirit of Constant Entrepreneurship. Zaha Hadid has translated this to create a new workplace environment that nurtures openness and communication. The design activates the city and its surrounding conditions, while implementing the latest technologic solutions and construction methods to create a functional, adaptable and enjoyable workplace." Guangzhou Infinitus Plaza just looks unlike a workplace. Designed as a series of "infinite rings" that bring everyone together and follow the arrangement of the symbol for infinity - ∞ -Zaha Hadid organized all departments within the Guangzhou Infinitus Plaza around the central atria and courtyards that foster open communication and interaction. The buildings were designed to maximize the amount of natural light entering the interior while the exterior surfaces provide sun shading and rain collection systems. Connected walkways improve communication for all employees. Walking and jogging courses, as well as a garden of Chinese herbal plants and flora on the roof enable all employees and visitors to maintain an active lifestyle. The health industry will embrace broader development space under the guidance of the national strategy "Healthy China". Upon completion, Guangzhou Infinitus Plaza will be an important anchor to the health industry development of Baiyun District, contributing to the local economy with excellent employment opportunities. Guangzhou Infinitus Plaza is the first large project in which LKKHPG conducted site selection, conceptual planning, and construction all by itself in Chinese Mainland. LKKHPG had earlier acquired the Infinitus Center in Zhujiang New Town, Guangzhou; the Infinitus Plaza in Sheung Wan, Hong Kong; and the Shanghai Corporate Avenue 3 (soon to be renamed Infinitus Tower) in Huangpu District, Shanghai. This collection of quality properties is expected to meet the long-term development goals of LKKHPG while providing strong support for the sustainable and healthy development of Infinitus' business. LKK Health Products Group (LKKHPG) is a member of Lee Kum Kee Group, a century-old Hong Kong enterprise. Headquartered in Hong Kong, LKKHPG is a modern and diversified business group that specializes in R&D, production, sales and services of Chinese herbal health products; TCM plantation management and sales of raw Chinese medicinal materials; mobile internet platform and related products and services; and property investment. As of 30 June 2016, LKKHPG had approximately 4,800 employees. Infinitus (China) Company Ltd. (hereinafter referred to as Infinitus (China) or the Company), founded in 1992, is a member of LKKHPG. It has been accredited as National High-Tech Enterprise. Its Product Inspection Center has been accredited as National Accredited Laboratory by China National Accreditation Service for Conformity Assessment (CNAS), and has passed the Proficiency Testing for Food Chemistry of the Food Analysis Performance Assessment Scheme (FAPAS) in the UK in 2012. Committed to providing high-quality Chinese herbal health products, Infinitus (China) invests more than RMB 100 million in R&D and technology every year. As a pioneer in compound polysaccharides technology, the Company has acquired 452 patents as well as scores of core independent intellectual property rights. As of June 2016, the Company had developed 124 high-quality Chinese herbal health products in 5 series that were marketed under 6 brands. It also has set up 36 branches, 29 service centers together with over 6,400 exclusive stores in Chinese Mainland. Zaha Hadid, founder of Zaha Hadid Architects (ZHA), was awarded the Pritzker Architecture Prize (considered to be the Nobel Prize of architecture) in 2004. She was the first woman to receive the award and internationally known for her ground-breaking streamlined architectural works. Zaha Hadid's outstanding architecture projects also include the MAXXI Museum in Rome, the 2012 London Olympic Aquatics Centre, the Jockey Club Innovation Tower at Hong Kong Polytechnic University, the Guangzhou Opera House, and the Wangjing SOHO in Beijing. Zaha Hadid's vision redefined architecture for the 21st century and captured imaginations across the globe. Her legacy endures within the DNA of the design studio she created. Working with office partner Patrik Schumacher for three decades, ZHA's work arranges form and space into breath-taking spatial compositions. With 55 projects in 26 countries under construction or in design development, ZHA's hugely talented and dedicated teams honor Zaha's legacy, working to design and deliver transformational projects on six continents. For more information, please visit: http://www.lkkhpg.com/en-us/media-centre/corporate-news/detail/20161110174700.


News Article | November 4, 2016
Site: www.prnewswire.co.uk

The Third Summit on University Social Responsibility (USR), a key initiative of the University Social Responsibility Network (USR Network), kicked-off today (4 November) in Beijing. Co-hosted by The Hong Kong Polytechnic University (PolyU) and Peking University (Peking U), the Summit has attracted over 100 academia from around the world to gather together for a fruitful exchange on an important agenda: "Nurturing a Culture for University Social Responsibility". The Opening Ceremony was held at the Diaoyutai State Guesthouse. Addressing the Opening ceremony, Peking University President Professor Lin Jianhua said, "For universities in the Chinese mainland, we have a commitment to take on the responsibility for the society, the nation and the world. Peking University has inherited and has been diligently following this tradition. On the one hand, we teach students to bear social responsibility during their studies and after graduation. On the other hand, the Universities have to bear their responsibility for the community, the region, and the nation, during their course of development and advancement." Professor Lin added, "This is a difficult mission, and it calls for concerted efforts of higher education leaders." Speaking at the Opening Ceremony, PolyU President Professor Timothy W. Tong said, "Over the last few decades, global challenges such as economic development, environmental protection and technological innovation have driven universities worldwide to redefine their roles and responsibilities beyond traditional education and research in order to bolster their impact on society. Consequently, social responsibility has become a subject high on the agenda." Professor Tong added, "The USR Network member universities sharing the same vision of making our world increasingly just, inclusive, peaceful and sustainable. With an emphasis on collaboration among members and with other networks and alliances, the Network has vigorously promoted USR by organizing a number of projects including this University Social Responsibility Summit." This year, the Summit has brought together more than 50 speakers who are higher education leaders and scholars from over 10 countries and regions. They exchanged views at three Presidents' Roundtable sessions respectively themed "Social Responsibility: A Core Mission of Universities in 21st Century?", "USR: Translating Vision into Action and Impact", and "USR in Asia: Challenges and Opportunities". Plenary sessions held tomorrow (5 November) will include "Community Engagement in Higher Education: Policy and Practice", "Nurturing Future Leaders through Service-Learning: Strategies and Learning Outcomes" and "Building Disaster Response Capacity - University Students as Community First Responders". This is the first time that the Summit has a separate Student Forum on 4 November at Peking University campus. The Forum attracted more than 100 students, many of them are delegates from the USR Network member universities. In addition, there will be a student presentation tomorrow. Four teams of students from PolyU, PekingU, Sichuan University and Beijing Normal University conducted presentations to share the views and practical experience of USR from the students' perspective. Their presence and contribution at the Summit are evidence of the USR Network's commitment to engaging the university community to address world challenges and shape a better future. The second Executive Committee meeting of the USR Network was held yesterday (3 November) to discuss the strategies and work for the coming year. With two new members, University of Sao Paulo, Brazil and University of Pretoria, South Africa, the USR Network now include the following 14 universities (in alphabetical order of their country): For details of the USR Network, please visit http://www.usrnetwork.org.


News Article | November 4, 2016
Site: www.prweb.com

The Opening Ceremony was held at the Diaoyutai State Guesthouse. Addressing the Opening ceremony, Peking University President Professor Lin Jianhua said, “For universities in the Chinese mainland, we have a commitment to take on the responsibility for the society, the nation and the world. Peking University has inherited and has been diligently following this tradition. On the one hand, we teach students to bear social responsibility during their studies and after graduation. On the other hand, the Universities have to bear their responsibility for the community, the region, and the nation, during their course of development and advancement.” Professor Lin added, “This is a difficult mission, and it calls for concerted efforts of higher education leaders.” Speaking at the Opening Ceremony, PolyU President Professor Timothy W. Tong said, “Over the last few decades, global challenges such as economic development, environmental protection and technological innovation have driven universities worldwide to redefine their roles and responsibilities beyond traditional education and research in order to bolster their impact on society. Consequently, social responsibility has become a subject high on the agenda.” Professor Tong added, “The USR Network member universities sharing the same vision of making our world increasingly just, inclusive, peaceful and sustainable. With an emphasis on collaboration among members and with other networks and alliances, the Network has vigorously promoted USR by organizing a number of projects including this University Social Responsibility Summit.” This year, the Summit has brought together more than 50 speakers who are higher education leaders and scholars from over 10 countries and regions. They exchanged views at three Presidents’ Roundtable sessions respectively themed “Social Responsibility: A Core Mission of Universities in 21st Century?”, “USR: Translating Vision into Action and Impact”, and “USR in Asia: Challenges and Opportunities”. Plenary sessions held tomorrow (5 November) will include “Community Engagement in Higher Education: Policy and Practice”, “Nurturing Future Leaders through Service-Learning: Strategies and Learning Outcomes” and “Building Disaster Response Capacity – University Students as Community First Responders”. This is the first time that the Summit has a separate Student Forum on 4 November at Peking University campus. The Forum attracted more than 100 students, many of them are delegates from the USR Network member universities. In addition, there will be a student presentation tomorrow. Four teams of students from PolyU, PekingU, Sichuan University and Beijing Normal University conducted presentations to share the views and practical experience of USR from the students’ perspective. Their presence and contribution at the Summit are evidence of the USR Network’s commitment to engaging the university community to address world challenges and shape a better future. The second Executive Committee meeting of the USR Network was held yesterday (3 November) to discuss the strategies and work for the coming year. With two new members, University of Sao Paulo, Brazil and University of Pretoria, South Africa, the USR Network now include the following 14 universities (in alphabetical order of their country): Australia | University of New South Wales Brazil | University of Sao Paulo Hong Kong, P.R.C. | The Hong Kong Polytechnic University Israel | University of Haifa Japan | Kyoto University Korea | Yonsei University P.R.C. | Peking University P.R.C. | Beijing Normal University P.R.C. | Sichuan University P.R.C. | South Africa University of Pretoria U.K. | Clare Hall, University of Cambridge U.K. | The University of Manchester U.S.A. | Tufts University U.S.A. | Washington University in St. Louis For details of the USR Network, please visit http://www.usrnetwork.org.


Deng Y.,Southwest University | Deng Y.,Shanghai JiaoTong University | Chan F.T.S.,Hong Kong Polytechnic University
Expert Systems with Applications | Year: 2011

Supplier selection is a multi-criterion decision making problem under uncertain environments. Hence, it is reasonable to hand the problem in fuzzy sets theory (FST) and Dempster Shafer theory of evidence (DST). In this paper, a new MCDM methodology, using FST and DST, based on the main idea of the technique for order preference by similarity to an ideal solution (TOPSIS), is developed to deal with supplier selection problem. The basic probability assignments (BPA) can be determined by the distance to the ideal solution and the distance to the negative ideal solution. Dempster combination rule is used to combine all the criterion data to get the final scores of the alternatives in the systems. The final decision results can be drawn through the pignistic probability transformation. In traditional fuzzy TOPSIS method, the quantitative performance of criterion, such as crisp numbers, should be transformed into fuzzy numbers. The proposed method is more flexible due to the reason that the BPA can be determined without the transformation step in traditional fuzzy TOPSIS method. The performance of criterion can be represented as crisp number or fuzzy number according to the real situation in our proposed method. The numerical example about supplier selection is used to illustrate the efficiency of the proposed method. © 2011 Published by Elsevier Ltd.


Yu T.,University of Wollongong | Teng J.G.,Hong Kong Polytechnic University
Journal of Composites for Construction | Year: 2013

Hybrid fiber-reinforced polymer (FRP) concrete steel, double skin tubular columns (DSTCs) are a new form of hybrid columns. The most common sectional form of hybrid DSTCs consists of a layer of concrete sandwiched between a circular inner steel tube and a circular outer FRP tube whose fiber directions are close to the hoop detection to provide effective confinement to the concrete. Much recent research has been conducted on circular hybrid DSTCs, which has demonstrated that the combination of the three constituent materials leads to several advantages not available with existing forms of columns. In practical applications, for aesthetic and other reasons, square hybrid DSTCs may be needed. This paper thus extends the existing work on circular hybrid DSTCs to square hybrid DSTCs in which the outer FRP tube is square while the inner steel tube is still circular. Results from a series of axial compression tests are presented and interpreted to examine the compressive behavior of square hybrid DSTCs. In these tests, FRP tubes formed through a wet-layup process were used instead of filament-wound FRP tubes because the latter were not readily available to the authors at the time of the study. The test results show that the concrete in these square hybrid DSTCs is effectively confined by the two tubes, and the behavior of the confined concrete is similar to that of concrete in FRP-confined solid columns. A stress-strain model for concrete in square hybrid DSTCs is also proposed and is shown to provide reasonably accurate predictions of the test results. © 2013 American Society of Civil Engineers.


Zhang S.S.,Hong Kong Polytechnic University | Teng J.G.,Hong Kong Polytechnic University | Yu T.,University of Wollongong
Engineering Structures | Year: 2013

A relatively recent method for the strengthening of concrete structures involves the embedding of fiber reinforced polymer (FRP) bars/strips into pre-cut, adhesive-filled grooves in the cover concrete. This paper presents a finite element (FE) study into the bond behavior of NSM CFRP strip-to-concrete bonded joints using a three-dimensional (3-D) meso-scale FE model developed by the authors. The effects of various parameters on the bond behavior of NSM CFRP strips are first clarified with the assistance of FE results, leading to the identification of the groove height-to-width ratio and the concrete strength as the two important parameters for the bond behavior. Based on the results of a FE parametric study on the effects of these two parameters, an analytical bond-slip model is proposed. © 2013 Elsevier Ltd.


Wu Y.I.,University of Electronic Science and Technology of China | Wong K.T.,Hong Kong Polytechnic University | Lau S.-K.,University of Nebraska at Omaha
IEEE Transactions on Signal Processing | Year: 2010

The acoustic vector-sensor is a practical and versatile sound-measurement system, for applications in-room, open-air, or underwater. Its far-field measurement model has been introduced into signal processing over a decade ago; and many direction-finding algorithms have since been developed for acoustic vector-sensors, but only for far-field sources. Missing in the literature is a near-field measurement model for the acoustic vector-sensor. This correspondence fills this literature gap. © 2010 IEEE.


Teng J.G.,Hong Kong Polytechnic University | Yu T.,University of Wollongong | Fernando D.,ETH Zurich
Journal of Constructional Steel Research | Year: 2012

Over the past two decades, fiber-reinforced polymer (FRP) composites have gradually gained wide acceptance in civil engineering applications due to their unique advantages including their high strength-to-weight ratio and excellent corrosion resistance. In particular, many possibilities of using FRP in the strengthening and construction of concrete structures have been explored. More recently, the use of FRP to strengthen existing steel structures has received much attention. This paper starts with a critical discussion of the use of FRP in the strengthening of steel structures where the advantages of FRP are appropriately exploited. The paper then provides a critical review and interpretation of existing research on FRP-strengthened steel structures. Topics covered by the review include steel surface preparation for adhesive bonding, selection of a suitable adhesive, bond behavior between FRP and steel and its appropriate modeling, flexural strengthening of steel beams, fatigue strengthening of steel structures, strengthening of thin-walled steel structures against local buckling, and strengthening of hollow or concrete-filled steel tubes through external FRP confinement. The paper concludes with comments on future research needs. © 2012 Elsevier Ltd. All rights reserved.


Ma H.,Shenzhen Polytechnic | Chan K.W.,Hong Kong Polytechnic University | Liu M.,South China University of Technology
IEEE Transactions on Industrial Informatics | Year: 2013

The intelligent control of power systems is one of the main tasks for realizing a smart grid. Because of the high-dimensional dynamics and discrete control of power systems, realizing an optimal control to support system voltages is a hard combinatorial optimization problem. In this paper, a new intelligent scheme based on a genetic learning progress for optimal voltage control is proposed. This learning control scheme combines the genetic algorithm (GA) with a memory which saves knowledge accumulated from past experiences. In each run of search by GA, past experiences in memory is exploited to speed up the searching of GA and improve the quality of the solutions while the knowledge in memory is also refined by the new solutions. With the help of this learning capability, a fast and self-healing voltage control is realized and the control performance can be improved gradually over time. A case study on the New England 39-bus power system showed that the purposed learning control can successfully prevent the system from voltage instability and at the same time a fast and adaptive system response is provided. © 2005-2012 IEEE.


Catalano R.F.,University of Washington | Fagan A.A.,University of South Carolina | Gavin L.E.,Centers for Disease Control and Prevention | Greenberg M.T.,Pennsylvania State University | And 3 more authors.
The Lancet | Year: 2012

The burden of morbidity and mortality from non-communicable disease has risen worldwide and is accelerating in low-income and middle-income countries, whereas the burden from infectious diseases has declined. Since this transition, the prevention of non-communicable disease as well as communicable disease causes of adolescent mortality has risen in importance. Problem behaviours that increase the short-term or long-term likelihood of morbidity and mortality, including alcohol, tobacco, and other drug misuse, mental health problems, unsafe sex, risky and unsafe driving, and violence are largely preventable. In the past 30 years new discoveries have led to prevention science being established as a discipline designed to mitigate these problem behaviours. Longitudinal studies have provided an understanding of risk and protective factors across the life course for many of these problem behaviours. Risks cluster across development to produce early accumulation of risk in childhood and more pervasive risk in adolescence. This understanding has led to the construction of developmentally appropriate prevention policies and programmes that have shown short-term and long-term reductions in these adolescent problem behaviours. We describe the principles of prevention science, provide examples of efficacious preventive interventions, describe challenges and potential solutions to take efficacious prevention policies and programmes to scale, and conclude with recommendations to reduce the burden of adolescent mortality and morbidity worldwide through preventive intervention.


Teng J.G.,Hong Kong Polytechnic University | Hu Y.M.,Hong Kong Polytechnic University | Yu T.,University of Wollongong
Engineering Structures | Year: 2013

Concrete-filled steel tubes (CFTs) are widely used as columns in many structural systems. In CFTs, degradation in steel confinement, strength and ductility can result from inelastic outward local buckling. To overcome this deficiency of CFTs, external confinement of CFTs with an FRP jacket has been explored in recent studies. This paper presents a theoretical model in an incremental-iterative form for circular FRP-confined CFTs (CCFTs) under monotonic axial compression, with the focus being on the stress-strain behavior of the confined concrete. The proposed stress-strain model for concrete in CCFTs is based on the same approach as that commonly adopted by existing models for FRP-confined concrete and includes three components: (a) an active-confinement model; (b) a lateral strain equation; and (c) equations for determining the total confining pressure from the steel tube and the FRP jacket. It is shown that the lateral dilation behavior of concrete in CCFTs differs significantly from that of FRP-confined concrete in the initial stage because the former experiences more severe micro-cracking than the latter in the initial stage of loading; this difference is reflected in the proposed model. In general, the predictions of the proposed model are in close agreement with existing test results. The proposed model provides a useful tool for a parametric study on the stress-strain behavior of confined concrete in CCFTs to produce results for the formulation of simple stress-strain model in closed-form expressions for design use. © 2012 Elsevier Ltd.


Hsieh J.J.P.-A.,Hong Kong Polytechnic University | Rai A.,Center for Process Innovation | Petter S.,University of Nebraska at Omaha | Zhang T.,Xi'an Jiaotong University
MIS Quarterly: Management Information Systems | Year: 2012

An increasing number of organizations are now implementing customer relationship management (CRM) systems to support front-line employees' service tasks. With the belief that CRM can enhance employees' service quality, management often mandates employees to use the implemented CRM. However, challenges emerge if/when employees are dissatisfied with using the system. To understand the role of front-line employee users' satisfaction with their mandated use of CRM in determining their service quality, we conducted a field study in one of the largest telecommunications service organizations in China and gathered time-lagged data from self-reported employee surveys, as well as from the firm's archival data sources. Our results suggest that employees' overall user satisfaction (UserSat) with their mandated use of CRM has a positive impact on employee service quality (ESQ) above and beyond the expected positive impacts that job dedication (JD) and embodied service knowledge (ESK) have on ESQ. Interestingly, the positive effect of UserSat on ESQ is comparable to the positive effects of JD and ESK, respectively, on ESQ. Importantly, UserSat and ESK have a substitutive effect on ESQ, suggesting that the impact of UserSat on ESQ is stronger/weaker for employees with lower/higher levels of ESK. Finally, ESQ predicts customer satisfaction with customer service employees (CSWCSE); ESQ also fully mediates the impacts of UserSat and ESK, and partially mediates the impact of JD, on CSWCSE. The results of this study emphasize the importance of user satisfaction in determining employees' task outcomes when use of an information system is mandated.


Yan R.,University of Sheffield | Shao L.,University of Sheffield | Shao L.,Nanjing University of Information Science and Technology | Liu Y.,Hong Kong Polytechnic University
IEEE Transactions on Image Processing | Year: 2013

Exploiting the sparsity within representation models for images is critical for image denoising. The best currently available denoising methods take advantage of the sparsity from image self-similarity, pre-learned, and fixed representations. Most of these methods, however, still have difficulties in tackling high noise levels or noise models other than Gaussian. In this paper, the multiresolution structure and sparsity of wavelets are employed by nonlocal dictionary learning in each decomposition level of the wavelets. Experimental results show that our proposed method outperforms two state-of-the-art image denoising algorithms on higher noise levels. Furthermore, our approach is more adaptive to the less extensively researched uniform noise. © 1992-2012 IEEE.


News Article | October 23, 2015
Site: news.mit.edu

Researchers have found a way to couple the properties of different two-dimensional materials to provide an exceptional degree of control over light waves. They say this has the potential to lead to new kinds of light detection, thermal-management systems, and high-resolution imaging devices. The new findings — using a layer of one-atom-thick graphene deposited on top of a similar 2-D layer of a material called hexagonal boron nitride (hBN) — are published in the journal Nano Letters. The work is co-authored by MIT associate professor of mechanical engineering Nicholas Fang and graduate student Anshuman Kumar, and their co-authors at IBM’s T.J. Watson Research Center, Hong Kong Polytechnic University, and the University of Minnesota. Although the two materials are structurally similar — both composed of hexagonal arrays of atoms that form two-dimensional sheets — they each interact with light quite differently. But the researchers found that these interactions can be complementary, and can couple in ways that afford a great deal of control over the behavior of light. The hybrid material blocks light when a particular voltage is applied to the graphene, while allowing a special kind of emission and propagation, called “hyperbolicity,” when a different voltage is applied — a phenomenon not seen before in optical systems, Fang says. One of the consequences of this unusual behavior is that an extremely thin sheet of material can interact strongly with light, allowing beams to be guided, funneled, and controlled by voltages applied to the sheet. “This poses a new opportunity to send and receive light over a very confined space,” Fang says, and could lead to “unique optical material that has great potential for optical interconnects.” Many researchers see improved interconnection of optical and electronic components as a path to more efficient computation and imaging systems. Light’s interaction with graphene produces particles called plasmons, while light interacting with hBN produces phonons. Fang and his colleagues found that when the materials are combined in a certain way, the plasmons and phonons can couple, producing a strong resonance. The properties of the graphene allow precise control over light, while hBN provides very strong confinement and guidance of the light. Combining the two makes it possible to create new “metamaterials” that marry the advantages of both, the researchers say. Phaedon Avouris, a researcher at IBM and co-author of the paper, says, “The combination of these two materials provides a unique system that allows the manipulation of optical processes.” The combined materials create a tuned system that can be adjusted to allow light only of certain specific wavelengths or directions to propagate, they say. “We can start to selectively pick some frequencies [to let through], and reject some,” Kumar says. These properties should make it possible, Fang says, to create tiny optical waveguides, about 20 nanometers in size — the same size range as the smallest features that can now be produced in microchips. This could lead to chips that combine optical and electronic components in a single device, with far lower losses than when such devices are made separately and then interconnected, they say. Co-author Tony Low, a researcher at IBM and the University of Minnesota, says, “Our work paves the way for using 2-D material heterostructures for engineering new optical properties on demand.” Another potential application, Fang says, comes from the ability to switch a light beam on and off at the material’s surface; because the material naturally works at near-infrared wavelengths, this could enable new avenues for infrared spectroscopy, he says. “It could even enable single-molecule resolution,” Fang says, of biomolecules placed on the hybrid material’s surface. Sheng Shen, an assistant professor of mechanical engineering at Carnegie Mellon University who was not involved in this research, says, “This work represents significant progress on understanding tunable interactions of light in graphene-hBN.” The work is “pretty critical” for providing the understanding needed to develop optoelectronic or photonic devices based on graphene and hBN, he says, and “could provide direct theoretical guidance on designing such types of devices. … I am personally very excited about this novel theoretical work.” The research team also included Kin Hung Fung of Hong Kong Polytechnic University. The work was supported by the National Science Foundation and the Air Force Office of Scientific Research.


News Article | November 8, 2016
Site: www.chromatographytechniques.com

The research team of Xuechen Li at the HKU Department of Chemistry, together with collaborators at the University of Central Florida (Yu Yuan), and the Hong Kong Polytechnic University (Sheng Chen), reported their research findings on the synthesis of a newly discovered "game-changing" antibiotic, Teixobactin, in Nature Communications recently. This underlies potential application and development of the next-generation teixobactin-based antibacterial drugs. Antimicrobial resistance is on the rise globally and has become a serious threat to human health. For instance, methicillin- resistant Staphylococcus aureus (MRSA) has emerged as one of the most important pathogens, both in hospital (HA-MRSA) and community-acquired infections (CA-MRSA). It is considered one of the most important superbugs in Hong Kong as it is extremely infectious and has a high mortality rate. To avoid further aggravation of resistance-related problems, misuse and overuse of antibiotics should be prevented to minimize the emergence of drug-resistant organisms. At the same time, development of novel antibacterial and anti-resistant agents should be actively pursued. Although there is an urgent public need for new antibacterial drugs, very few pharmaceutical companies are interested in investing in the development of these, due to the lower profit margin compared to medicines used to treat diabetes and cardiovascular diseases. The fact that no new antibiotics have been introduced to the market over the last decade is evidence of this. To address this issue, researchers in academia should play a more active role in the search for new antimicrobial compounds. Li's research team has taken up the responsibility and challenge and has been working on the development of new antibiotics for the past seven years. In 2013, they developed the first chemical synthesis of an antibiotic daptomycin, which enabled them to search for the next-generation daptomycin-based antibiotics. Recently, his team has achieved further success by developing a chemical strategy to synthesize another antibiotic, teixobactin. Last year, the discovery of the antibiotic teixobactin by researchers in the U.S.,, was considered a breakthrough in antibacterial drug research (Nature, 2015, 517, 455). Teixobactin can kill a range of pathogens without detectable resistance, including methicillin-resistant Staphylococcus aureus (MRSA), vancomycin-resistant Enterococcus (VRE) and Mycobacterium tuberculosis. As promising as it is, Teixobactin is not perfect yet as a drug and can be further improved for its clinical properties via its structural modification. In the history of antibacterial drug development, modification of the lead compound has successfully led to many generations of improved penicillin-based antibiotics. Indeed, it is only through chemical synthesis and medicinal chemistry that one can flexibly modify the teixobactin structure to generate various teixobactin derivatives from simple materials. Thus, the development of a strategy to chemically synthesize teixobactin and its derivatives has drawn a lot of attention with intense competition worldwide and more than 15 research groups from different countries have been striving to develop a chemical strategy to synthesize teixobactin. Collaborating with another chemist from University of Central Florida, USA, the HKU team became one of the fastest groups in the world to complete the chemical synthesis of teixobactin, from which they have also generated 10 teixobactin analogues with promising properties (US provisional patent filed). The strategy they developed is very efficient and can generate many teixobactin derivatives in a fast and combinatory manner. Now, they are running at a full speed with an aim to synthesize more 100 different teixobactin derivatives within two years to search for analogues with improved pharmacological properties for the clinical development.


News Article | August 29, 2016
Site: www.rdmag.com

Dr Xuechen Li of HKU Department of Chemistry and his research team, together with his collaborators in University of Central Florida (Dr Yu Yuan), USA and the Hong Kong Polytechnic University (Dr Sheng Chen), reported their studies on the synthesis of a newly discovered "game-changing" antibiotic, Teixobactin, in Nature Communications recently. This underlies potential application and development of the next-generation teixobactin-based antibacterial drugs. Antimicrobial resistance is on the rise globally and has become a serious threat to human health. For instance, methicillin- resistant Staphylococcus aureus (MRSA) has emerged as one of the most important pathogens, both in hospital (HA-MRSA) and community-acquired infections (CA-MRSA). It is considered one of the most important super-bugs in Hong Kong as it is extremely infectious and has a high mortality rate. To avoid further aggravation of resistance-related problems, misuse and overuse of antibiotics should be prevented to minimize the emergence of drug-resistant organisms. At the same time, development of novel antibacterial and anti-resistant agents should be actively pursued. Although there is an urgent public need for new antibacterial drugs, very few pharmaceutical companies are interested in investing in the development of these, due to the lower profit margin compared to medicines used to treat diabetes and cardiovascular diseases. That no new antibiotics have been introduced to the market over the last decade is evidence of this. To address this issue, researchers in academia should play a more active role in the search for new antimicrobial compounds. A team of researchers led by Dr Xuechen Li of the HKU Department of Chemistry, have taken up the responsibility and challenge and have been continuingly working on the development of new antibiotics for the past seven years. In 2013, they developed the first chemical synthesis of an antibiotic daptomycin, which enabled them to search for the next-generation daptomycin-based antibiotics. Recently, his team has had further success by developing a chemical strategy to synthesize another antibiotic, Teixobactin. Last year, the discovery of the antibiotic Teixobactin by researchers in the USA, was considered a breakthrough in antibacterial drug research (Nature, 2015, 517, 455). Teixobactin can kill a range of pathogens without detectable resistance, including methicillin-resistantStaphylococcus aureus (MRSA), vancomycin-resistant Enterococcus (VRE) and Mycobacterium tuberculosis. As promising as it is, Teixobactin is not perfect yet as a drug and can be further improved for its clinical properties via its structural modification. In the history of antibacterial drug development, modification of the lead compound has successfully led to many generations of improved penicillin-based antibiotics. Indeed, it is only through chemical synthesis and medicinal chemistry that one can flexibly modify the teixobactin structure to generate various teixobactin derivatives from simple materials. Thus, the development of a straetgy to chemically synthesize teixobactin and its derivatives has drawn a lot of attention with intense competition worldwide and more than 15 research groups from different countries have been striving to develop a chemical strategy to synthesize teixobactin. Collaborating with another chemist from University of Central Florida, USA, the HKU team became one of the fastest groups in the world to complete the chemical synthesis of teixobactin, from which they have also generated 10 teixobactin analogues with promising properties (US provisional patent filed). The strategy they developed is very efficient and can generate many teixobactin derivatives in a fast and combinatory manner. Now they are running at a full speed with an aim to synthesize more 100 different teixobactin derivatives within two years to search for analogues with improved pharmacological properties for the clinical development.


News Article | November 8, 2016
Site: www.eurekalert.org

The research team of Dr Xuechen Li at the HKU Department of Chemistry, together with collaborators at the University of Central Florida (Dr Yu Yuan), USA and the Hong Kong Polytechnic University (Dr Sheng Chen), reported their research findings on the synthesis of a newly discovered "game-changing" antibiotic, Teixobactin, in Nature Communications recently. This underlies potential application and development of the next-generation teixobactin-based antibacterial drugs. Antimicrobial resistance is on the rise globally and has become a serious threat to human health. For instance, methicillin- resistant Staphylococcus aureus (MRSA) has emerged as one of the most important pathogens, both in hospital (HA-MRSA) and community-acquired infections (CA-MRSA). It is considered one of the most important super-bugs in Hong Kong as it is extremely infectious and has a high mortality rate. To avoid further aggravation of resistance-related problems, misuse and overuse of antibiotics should be prevented to minimize the emergence of drug-resistant organisms. At the same time, development of novel antibacterial and anti-resistant agents should be actively pursued. Although there is an urgent public need for new antibacterial drugs, very few pharmaceutical companies are interested in investing in the development of these, due to the lower profit margin compared to medicines used to treat diabetes and cardiovascular diseases. The fact that no new antibiotics have been introduced to the market over the last decade is evidence of this. To address this issue, researchers in academia should play a more active role in the search for new antimicrobial compounds. Dr Xuechen Li's research team has taken up the responsibility and challenge and has been working on the development of new antibiotics for the past seven years. In 2013, they developed the first chemical synthesis of an antibiotic daptomycin, which enabled them to search for the next-generation daptomycin-based antibiotics. Recently, his team has achieved further success by developing a chemical strategy to synthesize another antibiotic, Teixobactin. Last year, the discovery of the antibiotic Teixobactin by researchers in the USA, was considered a breakthrough in antibacterial drug research (Nature, 2015, 517, 455). Teixobactin can kill a range of pathogens without detectable resistance, including methicillin-resistant Staphylococcus aureus (MRSA), vancomycin-resistant Enterococcus (VRE) and Mycobacterium tuberculosis. As promising as it is, Teixobactin is not perfect yet as a drug and can be further improved for its clinical properties via its structural modification. In the history of antibacterial drug development, modification of the lead compound has successfully led to many generations of improved penicillin-based antibiotics. Indeed, it is only through chemical synthesis and medicinal chemistry that one can flexibly modify the teixobactin structure to generate various teixobactin derivatives from simple materials. Thus, the development of a strategy to chemically synthesize teixobactin and its derivatives has drawn a lot of attention with intense competition worldwide and more than 15 research groups from different countries have been striving to develop a chemical strategy to synthesize teixobactin. Collaborating with another chemist from University of Central Florida, USA, the HKU team became one of the fastest groups in the world to complete the chemical synthesis of teixobactin, from which they have also generated 10 teixobactin analogues with promising properties (US provisional patent filed). The strategy they developed is very efficient and can generate many teixobactin derivatives in a fast and combinatory manner. Now they are running at a full speed with an aim to synthesize more 100 different teixobactin derivatives within two years to search for analogues with improved pharmacological properties for the clinical development.


News Article | February 28, 2017
Site: www.prlog.org

-- The Hong Kong Polytechnic University (PolyU) organised the Social Innovation Forum and Good Seed Award Presentation Ceremony on 25 February 2017 in celebration of PolyU's 80th Anniversary.  With the theme "Youth Power: Dare to Dream, Dare to Change", the  forum aims to promote entrepreneurial culture of  "Do Well Do Good" spirit and drive sustainable development of local entrepreneurial eco-system through inspirational sharing, exchange and networking activities.At the ceremony, Professor Timothy W. Tong, President of PolyU, encouraged young people to pursue the spirit of dare to dream, dare to change. He said, "I often encourage young people especially PolyU students to become 'practical dreamers'. They dare to dream and act to make a change to bring positive changes for society."Speaking at the ceremony, Professor Stephen Cheung Yan-leung, Chairperson of The Social Innovation and Entrepreneurship Development Fund (SIE Fund) Task Force, commended PolyU for its contribution to the development of Hong Kong and said, "Over the years, PolyU has been dedicated to working on application-oriented research, turning innovative ideas into practical value for the social good." Professor Cheung added that the SIE Fund would continue to promote cross-sector collaboration and to facilitate the development of social innovation ecosystem.Since its launch in 2015, Good Seed Programme has attracted around 500 young social entrepreneurs. After a stringent assessment process, 18 social innovation projects were awarded in 2016 and received HK$100,000 each from the SIE Fund to provide appropriate services to people in need including ethnic minorities, elderly people in need, students with special educational needs, visually impaired persons, Dyslexic patients, Autistic children for improving their quality of life and promoting social inclusion.PolyU invited a number of renowned social entrepreneurs to deliver keynote speeches on "Re-imagine our World with Social Innovation" at the Social Innovation Forum, including Mr. Kim Hyung-soo, CEO, Tree Planet from Korea, and Dr. Kevin Yang, CEO of 5% Design Action from Taiwan . Besides, nearly 20 local social entrepreneurs were invited as panel speakers to host the panel discussions on various topics like "Booming Young Social Innovators with "Do Well Do Good" Spirit", "Reshaping our Future Environment:Building a Better and Sustainable World", "Youth Empowerment:Making an Impact by Unleashing Creativity and Innovation in Education" and "Transforming Our World: Social inclusion for Sustainable Livelihoods". Over 200 social entrepreneurs, practitioners from social enterprise and NGO sectors, academics and students attended the forum.Good Seed Programme 2017 is now open to students and graduates of all local tertiary institutions until 1 March 2017. For event details, please visit Good Seed Programme website at www.goodseed.hk.


The Hong Kong Polytechnic University (PolyU) is proud to unveil the plaque today (30 November) for the "PolyU-Huawei Joint Laboratory for Optical Interconnection Network and Advanced Computing System" (Joint Lab). This is the first joint laboratory of high-capacity optical communications and advanced computing systems in Hong Kong, fostering PolyU's continuous partnership with Huawei Technologies Co. Ltd. (Huawei). The plaque unveiling ceremony was officiated by Ir Professor Alex Wai, Vice President (Research Development), PolyU and Mr. Jun Zha, President, Central Research Institute of Huawei. Through the Joint Lab, PolyU and Huawei will work on researches relating to high-capacity optical communication systems including long-haul and short-reach data center transmission systems, computer networks and systems, and big data computing. It aims to pioneer the research in the field of optical communication systems and advanced computing systems by leveraging synergy of the industry and the university. It targets at bolstering significantly the capacity of internet systems through technological breakthroughs, as well as developing system infrastructure and algorithmic solutions for computing-driven innovation. "The PolyU-Huawei Joint Lab for Optical Interconnection Network and Advanced Computing System was established to combine PolyU's strength in applying technological innovation and Huawei's leadership in the industry with an objective to develop high-capacity optical communication systems. It will enable a breakthrough in high-impact data technology to increase internet traffic significantly," said Professor Wai at the ceremony. PolyU's collaboration with Huawei has commenced since 2007. Their joint efforts have contributed to the establishment of the first 100Gbit/s per wavelength optical communication system in China. Research experts from different PolyU academic and research units, including Department of Electronic and Information Engineering, Department of Electrical Engineering, Department of Computing, Interdisciplinary Division of Biomedical Engineering, Department of Applied Mathematics and Department of Applied Physics, are engaged in the numerous collaborative projects between PolyU and Huawei. The research areas include but are not limited to communication, big data, crowdsourcing platforms, mobile networks, wearable devices, algorithms as well as materials. It is hoped that with the establishment of the Joint Lab, the scope of collaboration could be further extended in both breadth and depth. "The PolyU-Huawei Joint Lab will further integrate the advantages and strengths of the university and the enterprise in the area of innovative research and this collaboration will enhance our research ability. By building together a platform to share resources for innovation, the Joint Lab will enable our complementary development so as to achieve impactful R&D outputs and to jointly nurture talents of high caliber. This will result in increased global competitiveness and a win-win situation," said Mr Zha. Through close collaboration, PolyU and Huawei will be able to further develop high-impact translational research and next-generation technological advances in the telecommunications and advanced computing industry.


Lau A.K.W.,Hong Kong University of Science and Technology | Tang E.,Hong Kong Polytechnic University | Yam R.C.M.,City University of Hong Kong
Journal of Product Innovation Management | Year: 2010

While the beneficial impacts of supplier and customer integration are generally acknowledged, very few empirical research studies have examined how an organization can achieve better product performance through product innovation enhanced by such integration. This paper thus examines the impact of key supplier and customer integration processes (i.e., information sharing and product codevelopment with supplier and customer, respectively) on product innovation as well as their impact on product performance. It contributes to existing literature by asking how such integration activities affect product innovation and performance in both direct and indirect ways. After surveying 251 manufacturers in Hong Kong, this study tested the relationships among information sharing, product codevelopment, product innovativeness, and performance with three control variables (i.e., company size, type of industry, and market certainty). Structural equation modeling with correlation and t-tests was used to test the hypothesized research model. The findings indicate a direct, positive relationship between supplier and customer integration and product performance. In particular, this study verifies that sharing information with suppliers and product codevelopment with customers directly improves product performance. In addition, this study empirically examines the indirect effects of supplier and customer integration processes on product performance, mediated by innovation. This has seldom been attempted in previous research. The empirical findings show that product codevelopment with suppliers improves performance, mediated by innovation. However, the sampled firms cannot improve their product innovation by sharing information with their current customers and suppliers as well as codeveloping new products with the customers. If the adoption of supplier and customer integration is not cost free, the findings of this study may suggest firms work on particular supplier and customer integration processes (i.e., product codevelopment with suppliers) to improve their product innovation. The study also suggests that companies codevelop new products only with new customers and lead users instead of current ones for product innovation. For managers, this study has demonstrated that both information sharing and product codevelopment affect performance directly and indirectly. Managers should put more emphasis on these key processes, especially when linked with product innovation. Managers should consider involving their suppliers and customers in the early stages of design. Information sharing with suppliers is also important in product development. As suggested by this study, extensive effort on supplier and customer integration should be made to directly augment current product performance and product innovation at the same time. © 2010 Product Development & Management Association.


Chen S.,Hong Kong Polytechnic University | Karalewitz A.P.A.,Medical College of Wisconsin | Barbieri J.T.,Medical College of Wisconsin
Biochemistry | Year: 2012

The clostridial neurotoxins are among the most potent protein toxins for humans and are responsible for botulism, a flaccid paralysis elicited by the botulinum toxins (BoNT), and spastic paralysis elicited by tetanus toxin (TeNT). Seven serotypes of botulinum neurotoxins (A-G) and tetanus toxin showed different toxicities and cleave their substrates with different efficiencies. However, the molecular basis of their different catalytic activities with respect to their substrates is not clear. BoNT/B light chain (LC/B) and TeNT light chain (LC/T) cleave vesicle-associated membrane protein 2 (VAMP2) at the same scissile bond but possess different catalytic activities and substrate requirements, which make them the best candidates for studying the mechanisms of their different catalytic activities. The recognition of five major P sites of VAMP2 (P7, P6, P1, P1′, and P2′) and fine alignment of sites P2 and P3 and sites P2 and P4 by LC/B and LC/T, respectively, contributed to their substrate recognition and catalysis. Significantly, we found that the S1 pocket mutation LC/T(K168E) increased the rate of native VAMP2 cleavage so that it approached the rate of LC/B, which explains the molecular basis for the lower kcat that LC/T possesses for VAMP2 cleavage relative to that of LC/B. This analysis explains the molecular basis underlying the VAMP2 recognition and cleavage by LC/B and LC/T and provides insight that may extend the pharmacologic utility of these neurological reagents. © 2012 American Chemical Society.


Liu Y.,Stevens Institute of Technology | Xin J.H.,Hong Kong Polytechnic University | Choi C.-H.,Stevens Institute of Technology
Langmuir | Year: 2012

This article reports on the fabrication of cotton fabrics with single-faced superhydrophobicity using a simple foam finishing process. Unlike most commonly reported superhydrophobic fabrics, the fabrics developed in this study exhibit asymmetric wettability on their two faces: one face showing superhydrophobic behavior (highly nonwetting or water-repellent characteristics) and the other face retaining the inherent hydrophilic nature of cotton. The superhydrophobic face exhibits a low contact angle hysteresis of θa/ θr = 151/144 (θa, advancing contact angle; θr, receding contact angle), which enables water drops to roll off the surface easily so as to endow the surface with well-known self-cleaning properties. The untreated hydrophilic face preserves its water-absorbing capability, resulting in 44% of the water-absorbing capacity compared to that of the original cotton samples with both sides untreated (hydrophilic). The single-faced superhydrophobic fabrics also retain moisture transmissibility that is as good as that of the original untreated cotton fabrics. They also show robust washing fastness with the chemical cross-linking process of hydrophobic fluoropolymer to fabric fibers. Fabric materials with such asymmetric or gradient wettability will be of great use in many applications such as unidirectional liquid transporting, moisture management, microfluidic systems, desalination of seawater, flow management in fuel cells, and water/oil separation. © 2012 American Chemical Society.


Qu X.,Nanjing Southeast University | Wong S.-C.,Hong Kong Polytechnic University | Tse C.K.,Hong Kong Polytechnic University
IEEE Transactions on Power Electronics | Year: 2011

LEDs are potential successors of incandescent lamps with high luminous efficacy and long lifetime. To improve the overall luminair efficacy and lifetime, the power efficiency and lifetime of LED ballasts become important factors. Efficiency gain in transformerless power converters appears attractive for applications without isolation. Driving solid-state LED bulbs in an existing lighting fixture such as PAR30 style housing from universal mains necessitates a high-voltage step-down ratio in order to produce an output voltage of about 10-20 V, which is very common in LED lighting applications. Traditional nonisolated step-down pulse width modulation buck converters may suffer from poor efficiency due to the long diode freewheeling time at small duty cycles. In this paper, we propose a resonance-assisted buck converter to achieve a high-voltage step-down ratio and high converter efficiency, whilst maintaining durability and compatibility with existing incandescent dimmers. The performance of the proposed LED driver is verified experimentally. © 2006 IEEE.


Sun Z.,Hong Kong Polytechnic University | Li J.,Hong Kong Polytechnic University | Liu C.,Hong Kong University of Science and Technology | Yang S.,Hong Kong University of Science and Technology | Yan F.,Hong Kong Polytechnic University
Advanced Materials | Year: 2011

TiO 2 nanoparticles with different shapes and surface modifiers can change the hole mobility of a P3HT matrix in TiO 2/P3HT composite films by three orders of magnitude. The composite films with TiO 2 nanorods modified with pyridine show hole mobilities 2-3 times higher than that of a pristine P3HT film and the mobilities can reach as high as 0.23 cm 2 V -1s -1. © 2011 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim.


Lin P.,Hong Kong Polytechnic University | Luo X.,Hong Kong University of Science and Technology | Hsing I.-M.,Hong Kong University of Science and Technology | Yan F.,Hong Kong Polytechnic University
Advanced Materials | Year: 2011

Organic electrochemical transistors are integrated in flexible microfluidic systems. A novel label-free DNA sensor is developed based on the devices with single-stranded DNA probes immobilized on gate electrodes. These devices successfully detect complementary DNA targets at low concentrations using a pulse-enhanced hybridization technique in microfluidic channels. Organic electrochemical transistors are excellent candidates for flexible, highly sensitive, and low-cost biosensors. Copyright © 2011 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim.


Qu X.,Nanjing Southeast University | Wong S.-C.,Hong Kong Polytechnic University | Tse C.K.,Hong Kong Polytechnic University
IEEE Transactions on Power Electronics | Year: 2014

The imbalance in the currents of strings of LEDs will cause fast degradation or even failure in some LEDs. Such current imbalance should be avoided. To balance the common average current, a small duty cycle may necessitate a large LED turn-on current amplitude, which may cause temporal overheat and low luminous efficacy of the LEDs. This paper presents a current balancing method based on pulse-width modulation of a common bus voltage to each LED string to achieve the intended average current. An optimal feedback control scheme is proposed to maximize the duty cycles and minimize the bus voltage. As a result, at least one of the LED strings is operating at unity duty cycle. The analysis, implementation, and verification are detailed in this paper. © 2013 IEEE.


Yang W.,Nanjing Southeast University | Sun C.,Nanjing Southeast University | Zhang L.,Hong Kong Polytechnic University
Pattern Recognition | Year: 2011

In this paper, we propose a Multi-Manifold Discriminant Analysis (MMDA) method for an image feature extraction and pattern recognition based on graph embedded learning and under the Fisher discriminant analysis framework. In an MMDA, the within-class graph and between-class graph are, respectively, designed to characterize the within-class compactness and the between-class separability, seeking for the discriminant matrix to simultaneously maximize the between-class scatter and minimize the within-class scatter. In addition, in an MMDA, the within-class graph can represent the sub-manifold information, while the between-class graph can represent the multi-manifold information. The proposed MMDA is extensively examined by using the FERET, AR and ORL face databases, and the PolyU finger-knuckle-print databases. The experimental results demonstrate that an MMDA is effective in feature extraction, leading to promising image recognition performance. © 2011 Elsevier Ltd. All rights reserved.


Siu B.W.Y.,Hong Kong Polytechnic University | Lo H.K.,Hong Kong University of Science and Technology
Transportmetrica A: Transport Science | Year: 2014

Predominantly, existing dynamic traffic assignment studies presume that travel time is deterministic, merely subjected to congestion due to capacity limitations. In view of the inevitability of travel-time uncertainty, a lot of effort has been spent to investigate how uncertainty affects travel choices. Extending from the bottleneck scheduling model, this article establishes the connection between trip scheduling and punctuality reliability by considering that travellers value earliness and lateness differently according to their different degrees of punctuality reliability. Punctuality reliability refers to the probability of being not late for a scheduled activity, which is heterogeneous among travellers and depends on their degrees of risk aversion. By incorporating the notion of punctuality reliability, we can produce the sensible result that risk-averse travellers (those with higher punctuality reliability) choose to depart from home at earlier times, while such a mapping or feature is absent in the original model by Small [1982. The scheduling of consumer activities: work trips. American Economic Review, 72, 467-479]. The proposition is confirmed by our empirical study. The modelling framework is then demonstrated numerically first to the scheduling problem in a single bottleneck then to parallel bottlenecks that offer route choices. © 2013 © 2013 Hong Kong Society for Transportation Studies Limited.


Prajogo D.,Monash University | Tang A.K.Y.,Hong Kong Polytechnic University | Lai K.-H.,Hong Kong Polytechnic University
Journal of Cleaner Production | Year: 2012

There is an increasing growth of customers and regulators requesting enterprises to adopt the ISO 14001 environmental management standard over the last 15 years. Yet, any evidence for consistent environmental, market, and social benefits has been widely debated, which in turn, might be partly linked to the underlying organizational motives for environmental management system adoption. Based on the Institutional Theory and the Natural Resource-based view, this study examines the relationship of two different organizational adoption motives (i.e.; internal and external) with triple bottom line perceived benefits (i.e.; environmental, social, and market) on the adoption of ISO 14001. Using empirical data collected from a large-scale survey of Australian firms, we found that the motivation for environmental management system adoption was aligned closely with the types of benefits that accrued. The results indicate that external motives enhance social and market positioning, whereas internal motives better serve environmental benefits. Thus, managers may be seeking only a narrowly bounded set of outcomes from ISO 14001, rather than broader strategic improvement. The results also show the environmental benefits of adopting ISO 14001 to improve both the social and market benefits of the adopter enterprises. Practically, environmental benefits should be realized before firms can expect to reap social and market benefits from the environmental management system adoption. Our investigation on multiple motivations for organizational adoption of a voluntary standard provides important theoretical and practical insights on which organizational environmental management system adoption motives are conducive to fostering a broader set of strategic benefits. © 2012 Elsevier Ltd. All rights reserved.


Ma L.,Nanjing Southeast University | Wang J.,Nanjing Southeast University | Ding F.,Hong Kong Polytechnic University
Angewandte Chemie - International Edition | Year: 2012

Cut to ribbons: Making atomically well-controlled graphene nanoribbons (GNRs) is prerequisite for many graphene applications. Ab initio calculations reveal that, on applying a uniaxial external tensile strain, O atoms adsorbed on graphene form parallel epoxy chains, and subsequent cutting by oxygen attack gives GNRs instead of the quantum dots that are obtained from unstrained graphene (see picture). Copyright © 2012 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim.


Zhao J.-L.,China Agricultural University | Zhou L.-G.,China Agricultural University | Wu J.-Y.,Hong Kong Polytechnic University
Applied Microbiology and Biotechnology | Year: 2010

This study examined the effects of biotic and abiotic elicitors on the production of diterpenoid tanshinones in Salvia miltiorrhiza cell culture. Four classes of elicitors were tested, heavy metal ions (Co2+, Ag +, Cd2+), polysaccharides (yeast extract and chitosan), plant response-signaling compounds (salicylic acid and methyl jasmonate), and hyperosmotic stress (with sorbitol). Of these, Ag (silver nitrate), Cd (cadmium chloride), and polysaccharide from yeast extract (YE) were most effective to stimulate the tanshinone production, increasing the total tanshinone content of cell by more than ten-fold (2.3 mg g-1 versus 0.2 mg g-1 in control). The stimulating effect was concentration-dependent, most significant at 25 μM of Ag and Cd and 100 mg l-1 (carbohydrate content) of YE. Of the three tanshinones detected, cryptotanshinone was stimulated most dramatically by about 30-fold and tanshinones I and IIA by no more than 5-fold. Meanwhile, most of the elicitors suppressed cell growth, decreasing the biomass yield by about 50% (5.1-5.5 g l-1 versus 8.9 g l-1 in control). The elicitors also stimulated the phenylalanine ammonia lyase activity of cells and transient increases in the medium pH and conductivity. The results suggest that the elicitor-stimulated tanshinone accumulation was a stress response of the cells. © 2010 Springer-Verlag.


Tang Y.,Humboldt University of Berlin | Tang Y.,Potsdam Institute for Climate Impact Research | Wong W.K.,Hong Kong Polytechnic University
IEEE Transactions on Neural Networks and Learning Systems | Year: 2013

In this paper, we study the distributed synchronization and pinning distributed synchronization of stochastic coupled neural networks via randomly occurring control. Two Bernoulli stochastic variables are used to describe the occurrences of distributed adaptive control and updating law according to certain probabilities. Both distributed adaptive control and updating law for each vertex in a network depend on state information on each vertex's neighborhood. By constructing appropriate Lyapunov functions and employing stochastic analysis techniques, we prove that the distributed synchronization and the distributed pinning synchronization of stochastic complex networks can be achieved in mean square. Additionally, randomly occurring distributed control is compared with periodically intermittent control. It is revealed that, although randomly occurring control is an intermediate method among the three types of control in terms of control costs and convergence rates, it has fewer restrictions to implement and can be more easily applied in practice than periodically intermittent control. © 2013 IEEE.


Meng L.,Nanjing Southeast University | Sun Q.,Nanjing Southeast University | Wang J.,Nanjing Southeast University | Ding F.,Hong Kong Polytechnic University
Journal of Physical Chemistry C | Year: 2012

Grasping the fundamentals of graphene growth is vital for graphene synthesis. By employing classical molecular dynamics with the ReaxFF potential, we have investigated the evolution of carbon structures and the growth kinetics of graphene on Ni(111) surface at different temperatures. Our results showed that low C concentration leads to the dissolution of C atoms into Ni only, whereas high C concentration leads to the formation of graphene island. By efficient defect annealing at the optimal temperature of ∼1000 K, the quality of graphene island can be significantly improved. Furthermore, a graphene island can grow larger by capturing the deposited C atoms and form more hexagons on the edge with its self-healing capability during the growth. These underlying observations and understandings are instructive for the control of the CVD growth of graphene. © 2012 American Chemical Society.


Wu Q.,Nanjing Southeast University | Law R.,Hong Kong Polytechnic University
Information Sciences | Year: 2010

This paper proposes a robust loss function that penalizes hybrid noise (i.e., Gaussian noise, singularity points, and larger magnitude noise) in a complex fuzzy fault-diagnosis system. A mapping relationship between fuzzy numbers and crisp real numbers that allows a fuzzy sample set to be transformed into a crisp real sample set is also presented. Furthermore, the paper proposes a novel fuzzy robust wavelet support vector classifier (FRWSVC) based on a wavelet base function and develops an adaptive Gaussian particle swarm optimization (AGPSO) algorithm to seek the optimal unknown parameter of the FRWSVC. The results of experiments that apply the hybrid diagnosis model based on the FRWSVC and the AGPSO algorithm to fault diagnosis demonstrate that it is both feasible and effective. Tests comparing the method proposed in this paper against other fuzzy support vector classifier (FSVC) machines show that it outperforms them. © 2010 Elsevier Inc. All rights reserved.


Ma L.,Nanjing Southeast University | Wang J.,Nanjing Southeast University | Ding F.,Hong Kong Polytechnic University
ChemPhysChem | Year: 2013

Graphene, the thinnest two-dimensional material in nature, has abundant distinctive properties, such as ultrahigh carrier mobility, superior thermal conductivity, very high surface-to-volume ratio, anomalous quantum Hall effect, and so on. Laterally confined, thin, and long strips of graphene, namely, graphene nanoribbons (GNRs), can open the bandgap in the semimetal and give it the potential to replace silicon in future electronics. Great efforts are devoted to achieving high-quality GNRs with narrow widths and smooth edges. This minireview reports the latest progress in experimental and theoretical studies on GNR synthesis. Different methods of GNR synthesis - unzipping of carbon nanotubes (CNTs), cutting of graphene, and the direct synthesis of GNRs - are discussed, and their advantages and disadvantages are compared in detail. Current challenges and the prospects in this rapidly developing field are also addressed. Making ribbons: Synthetic methods for graphene nanoribbons, including unzipping of carbon nanotubes, lithographic patterning and plasma etching of graphene, cutting of graphene sheets by metal nanoparticles or oxidation, and chemical synthesis (see picture), are reviewed from both experimental and theoretical viewpoints, and advantages and disadvantages of these methods are compared. Copyright © 2013 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim.


Huang K.,Hong Kong Polytechnic University | Lau V.K.N.,Hong Kong University of Science and Technology
IEEE Transactions on Information Theory | Year: 2012

This paper addresses the stability and queueing delay of space-division multiple access (SDMA) systems with bursty traffic, where zero-forcing beamforming enables simultaneous transmissions to multiple mobiles. Computing beamforming vectors relies on quantized channel state information (CSI) feedback (limited feedback) from mobiles. Define the stability region for SDMA as the set of multiuser packet-arrival rates for which the steady-state queue lengths are finite. Given perfect feedback of channel-direction information (CDI) and equal power allocation over scheduled queues, the stability region is proved to be a convex polytope having the derived vertices. A similar result is obtained for the case with perfect feedback of CDI and channel-quality information (CQI), where CQI allows scheduling and power control for enlarging the stability region. For any set of arrival rates in the stability region, multiuser queues are shown to be stabilized by the joint queue-and-beamforming control policy that maximizes the departure-rate-weighted sum of queue lengths. The stability region for limited feedback is found to be the perfect-CSI region multiplied by one minus a small factor. The required number of feedback bits per mobile is proved to scale logarithmically with the inverse of the above factor as well as linearly with the number of transmit antennas minus one. The effect of limited feedback on queueing delay is also quantified. CDI quantization errors are shown to multiply average queueing delay by a factor $M > 1$. For given $M\rightarrow 1$, the number of feedback bits per mobile is proved to be $O(-\log-{2}(1-1/M))$. © 1963-2012 IEEE.


Chong A.Y.-L.,Hong Kong Polytechnic University | Chan F.T.S.,Hong Kong Polytechnic University | Ooi K.-B.,University Tunku Abdul Rahman
Decision Support Systems | Year: 2012

Advancements in wireless communications have increased the number of people using mobile devices, and have accelerated the growth of mobile commerce (m-commerce). This study aims to investigate the factors that predict consumer intention to adopt m-commerce in Malaysia and China. The work extends the traditional technology acceptance model (TAM) and diffusion of innovation (DOI) model, and includes additional variables such as trust, cost, social influence, variety of services, and control variables such as age, educational level, and gender of consumers. By comparing consumers from both Malaysia and China, this research is able to form a prediction model based on two different cultural settings. Data was collected from 172 Malaysian consumers and 222 Chinese consumers, and hierarchical regression analysis was employed to test the research model. The results showed that age, trust, cost, social influence, and variety of services are able to predict Malaysian consumer decisions to adopt m-commerce. Trust, cost, and social influence can be used to predict Chinese consumer decisions to adopt m-commerce. This research confirms the need to extend the traditional TAM and DOI models when studying technology such as m-commerce. The results from this study will be useful for telecommunication and m-commerce companies in formulating marketing strategies. © 2012 Elsevier B.V. All rights reserved.


Venkatesh V.,University of Arkansas | Thong J.Y.L.,Hong Kong University of Science and Technology | Xu X.,Hong Kong Polytechnic University
MIS Quarterly: Management Information Systems | Year: 2012

This paper extends the unified theory of acceptance and use of technology (UTAUT) to study acceptance and use of technology in a consumer context. Our proposed UTAUT2 incorporates three constructs into UTAUT: hedonic motivation, price value, and habit. Individual differences-namely, age, gender, and experience-are hypothesized to moderate the effects of these constructs on behavioral intention and technology use. Results from a two-stage online survey, with technology use data collected four months after the first survey, of 1,512 mobile Internet consumers supported our model. Compared to UTAUT, the extensions proposed in UTAUT2 produced a substantial improvement in the variance explained in behavioral intention (56 percent to 74 percent) and technology use (40 percent to 52 percent). The theoretical and managerial implications of these results are discussed.


Grant
Agency: European Commission | Branch: FP7 | Program: CP-SICA | Phase: HEALTH-2007-2.3.3-8 | Award Amount: 2.97M | Year: 2008

Despite widespread immunization, influenza still kills thousand of people, and costs to US, Europe and Asia enormous amount of money in term of healthcare expenses and productivity losses. While immunization remains an important approach to prevent influenza, small-molecule antiviral agents represent a novel opportunity for effective prevention and therapy of flu. Inhibitors of neuraminidase, essential enzyme for viral replication in all three classes of influenza viruses, has been recently found. Two of these inhibitors have reached the market, namely, zanamivir (GSKBs Relenza (1) in July 1999, and oseltamivir phosphate (Gilead Bs Tamiflu (2), also marketed by Roche) in October 1999. The recent healthy problem related to avian flu, has increase the public demand for stockpiles of Tamiflu, both as a reasonable frontline therapy against a possible flu pandemic and as a preventive agent. However, natural sources of drug (Shikimic acid) are scarcely, and increasing demand for oseltamivir phosphate has placed further pressure on Roche and the chemical community in general to develop new routes to the drug that do not involve complex natural products. In addition, the described synthesis are expensive and difficult. Moreover, in this synthesis use of hazardous azide-based reagents was necessary. New routes to Tamiflu have been recently described, but more than 12 steps in one case and 17 in another are needed. In order to find new drug candidates, cut the drug costs and improving availability as well as efficiency, new chemical synthesis are necessary. We propose a new domino reaction based on an organocatalytic approach to the synthesis of new Tamiflu derivatives. The chemistry involved in this project is easy to perform, and well adapt to industrial contest. Moreover, new chemical structures will be prepared and evaluated as potential drug against virulent and mutated flu viruses.


News Article | November 1, 2016
Site: www.prnewswire.co.uk

GUILIN, China, 1. November 2016 /PRNewswire/ -- Die Welttourismusorganisation (UNWTO), die Pacific Asia Travel Association (PATA, Tourismusverband für den asiatisch-pazifischen Raum) und die Volksregierung von Guilin in China feierten vom 20.-22. Oktober das 10. Jubiläum des UNWTO/PATA Forum on Tourism Trends and Outlook (UNWTO/PATA-Forum zu Trends und Aussichten im Fremdenverkehr). Thema des Forums war „Tourism 10:10 - Looking back to look forward" (Fremdenverkehr 10:10 – Ein zukunftsweisender Rückblick). In Zusammenarbeit mit der Hong Kong Polytechnic University, einem Mitglied der UNWTO, ist das Forum zu einer Gesprächsplattform für politische Entscheidungsträger, hochrangige Regierungsmitglieder und Vertreter der Reisebranche in der nordostasiatischen Subregion geworden. Dieses Jahr nahmen etwa 100 Vertreter an dem Forum teil, u. a. der Generalsekretär der UNWTO, Tabel Rifai, der CEO der Pacific Asia Travel Association, Mario Hardy, und der Dekan und Professor der Fakultät für Hotel- und Tourismusmanagement an der Hong Kong Polytechnic University, Kaye Chon. Das Forum wurde dieses Jahr zum 10. Mal in Guilin, China, abgehalten. Es wurden die Ergebnisse der vergangenen 9 Foren zusammengefasst sowie die künftige Entwicklung der Reisebranche diskutiert. Der Sonderausgabe zum 10. Jubiläum des Forums wurde große Bedeutung beigemessen. Tourismus-Trends, Veränderungen im Reise- und Buchungsverhalten sowie nachhaltige Praktiken in diesem Sektor waren einige der Themen, die in diesen Diskussionen angesprochen wurden. Wie in den vergangenen Jahren gab es dieses Jahr ebenfalls ein Unterforum zu Guilin. Um Ratschläge für die Entwicklung des Tourismus in Guilin zu bieten, wurden Themen im Zusammenhang mit gebietsbasiertem Tourismus und gezielter Armutsbekämpfung von Regierungsbeamten, Reiseexperten und Fachleuten im Forum diskutiert. Neu eingeführte Reiserouten machen Guilin zu einem globaleren Touristenziel. Die Gäste des Forums konnten die Stadt bei einer Führung auf zwei Wegen erkunden und sich die neuen kulturellen Sehenswürdigkeiten ansehen. Nach der Einrichtung des ersten chinesischen Tourismus-Observatoriums in Yangshuo im Landkreis Guilin vor 10 Jahren hat die UNWTO über 20 Observatorien an Reisezielen in der ganzen Welt gegründet. Da das Yangshuo Observatory als positives Beispiel dient, fand die 5th Annual Conference of UNWTO Sustainable Tourism Observatories in China ebenfalls in Guilin statt, und zwar am 20. und 21. Oktober. Guilin ist seit jeher ein renommiertes Reiseziel. Es wird von den Erfahrungen aus diesen beiden Veranstaltungen profitieren und sein Wachstum im Bereich des nachhaltigen Tourismus fortsetzen.


News Article | February 17, 2017
Site: www.prweb.com

The Hong Kong Polytechnic University (PolyU) is celebrating its 80th Anniversary this year with a Global Leader Lecture Series in which influential leaders in different professions around the globe will be invited to PolyU to deliver lectures on a wide range of topics covering healthcare, business, innovation and entrepreneurship, art and culture, sports and sustainable urban development. The series will provide the university community with a unique opportunity to learn from the stimulating insights and fresh perspectives of the speakers, and help inspire students to dream big and to bring positive changes to the world. Kicking off the series, the Faculties of Applied Science and Textiles (FAST) and Health and Social Sciences (FHSS) of PolyU had the honour of having Dr Marie-Paule Kieny, Assistant Director-General, Health Systems and Innovation, of the World Health Organization (WHO) to present a lecture entitled “Vaccine Development during the Ebola Public Health Emergency: Lessons Learnt and Perspectives for Enhanced Preparedness” which took place on 15th February. Ebola hemorrhagic fever was first described in 1976. The most widespread Ebola outbreak on record began in Guinea in December 2013, infecting more than 28,000 and killing over 11,300 people in many countries including Guinea, Liberia and Sierra Leone by 2016. In the absence of vaccines, and with insufficient diagnostics and medical teams, WHO led the development of an effective vaccine, demonstrating the possibility of compressing the research and development (R&D) time needed from a decade or longer to less than one year. During 2015-2016, Dr Kieny played a leading role in WHO's Ebola research activities by developing and evaluating innovative antiviral drugs and vaccines. She is currently in charge of Zika Virus R&D in WHO as well as the preparation of a WHO R&D Blueprint to accelerate global research preparedness for future outbreaks. The challenges and obstacles that global public health agencies face when devising a rapid response to control emerging infectious diseases was the highlight of Dr Kieny’s lecture. Professor Timothy W. Tong, President of PolyU, said, “At PolyU, our scholars and scientists have been focusing on research that can improve public health. We have active research programmes in drug development, vaccine studies, infection control and food safety……We have also been collaborating with the World Health Organization to exchange views and expertise on various health issues.” Through the PolyU 80th Anniversary Global Leader Lecture Series, PolyU promotes knowledge sharing by bringing global leaders to inspire us, and in this lecture, by sharing innovative R&D processes needed to control public health emergencies like the Ebola outbreak. For further information, please visit http://www.polyu.edu.hk/fast/80anniversary/who/.


Zhu G.-R.,Wuhan University of Technology | Tan S.-C.,University of Hong Kong | Chen Y.,Huazhong University of Science and Technology | Tse C.K.,Hong Kong Polytechnic University
IEEE Transactions on Power Electronics | Year: 2013

Fuel-cell power systems comprising single-phase dc/ac inverters draw low-frequency ac ripple currents at twice the output frequency from the fuel cell. Such a 100/120Hz ripple current may create instability in the fuel-cell system, lower its efficiency, and shorten the lifetime of a fuel cell stack. This paper presents a waveform control method that can mitigate such a low-frequency ripple current being drawn from the fuel cell while the fuel-cell system delivers ac power to the load through a differential inverter. This is possible because with the proposed solution, the pulsation component (cause of ac ripple current) of the output ac power will be supplied mainly by the two output capacitors of the differential inverter while the average dc output power is supplied by the fuel cell. Theoretical analysis, simulation, and experimental results are provided to explain the operation and showcase the performance of the approach. Results validate that the proposed solution can achieve significant mitigation of the current ripple as well as high-quality output voltage without extra hardware. Application of the solution is targeted at systems where current ripple mitigation is required, such as for the purpose of eliminating electrolytic capacitor in photovoltaic and LED systems. © 1986-2012 IEEE.


Lei K.F.,Chang Gung University | Leung P.H.M.,Hong Kong Polytechnic University
Microelectronic Engineering | Year: 2012

A microelectrode array biosensor has been developed for the detection of Legionella pneumophila serogroup 5 suspended in solution. The biosensor consists of a glass substrate with measuring microelectrodes and a PDMS layer providing a reservoir on the glass surface. The surface of the microelectrodes is functionalized and the analyte-specific antibodies are immobilized to form a biological transducer. The detection is based on measuring the impedance changes across the electrodes which is immersed in the bacteria suspension contained in the reservoir. Therefore, the bacterial concentration in solution can be estimated by impedance change. It is feasible to detect Legionella concentration from 105 to 108 colony-forming units (CFU)/ml. Since this method provides a fast and easy measurement, it has the potential to be developed into miniaturized equipment that can be installed in cooling towers for the continuous monitoring of Legionella concentration. © 2011 Elsevier B.V. All rights reserved.


Cheng H.,University of Bedfordshire | Yang S.,De Montfort University | Cao J.,Hong Kong Polytechnic University
Expert Systems with Applications | Year: 2013

Clustering can help aggregate the topology information and reduce the size of routing tables in a mobile ad hoc network (MANET). To achieve fairness and uniform energy consumption, each clusterhead should ideally support the same number of clustermembers. However, a MANET is a dynamic and complex system and its one important characteristic is the topology dynamics, that is, the network topology changes over time due to the factors such as energy conservation and node movement. Therefore, in a MANET, an effective clustering algorithm should efficiently adapt to each topology change and produce the new load balanced clusterhead set quickly. The maintenance of the cluster structure should aim to keep it as stable as possible to reduce overhead. To meet this requirement, the new solution should keep as many good parts in the previous solution as possible. In this paper, we first formulate the dynamic load balanced clustering problem (DLBCP) into a dynamic optimization problem. Then, we propose to use a series of dynamic genetic algorithms (GAs) to solve the DLBCP in MANETs. In these dynamic GAs, each individual represents a feasible clustering structure and its fitness is evaluated based on the load balance metric. Various dynamics handling techniques are introduced to help the population to deal with the topology changes and produce closely related solutions in good quality. The experimental results show that these GAs can work well for the DLBCP and outperform traditional GAs that do not consider dynamic network optimization requirements. © 2012 Elsevier Ltd. All rights reserved.


Wang Y.,Hong Kong Polytechnic University | Niu B.,Sun Yat Sen University | Guo P.,Hong Kong Polytechnic University
Production and Operations Management | Year: 2014

In a three-tier supply chain comprising an original equipment manufacturer (OEM), a contract manufacturer (CM), and a supplier, there exist two typical outsourcing structures: control and delegation. Under the control structure, the OEM contracts with the CM and the supplier respectively. Under the delegation structure, the OEM contracts with the CM only and the CM subcontracts with the supplier. We compare the two outsourcing structures under a push contract (whereby orders are placed before demand is realized) and a pull contract (whereby orders are placed after demand is realized). For all combinations of outsourcing structures and contracts, we derive the corresponding equilibrium wholesale prices, order quantities, and capacities. We find that the equilibrium production quantity is higher under control than under delegation for the push contract whereas the reverse holds for the pull contract. Both the OEM and the CM prefer control over delegation under the push contract. However, under the pull contract, the OEM prefers control over delegation whereas the CM and the supplier prefer delegation over control. We also show that for a given outsourcing structure, the OEM prefers the pull contract over the push contract. In extending our settings to a general two-wholesale-price (TWP) contract, we find that when wholesale prices are endogenized decision variables, the TWP contract under our setting degenerates to either a push or a pull contract. © 2013 Production and Operations Management Society.


Li H.,Bohai University | Jing X.,Hong Kong Polytechnic University | Karimi H.R.,University of Agder
IEEE Transactions on Industrial Electronics | Year: 2014

This paper deals with the problem of output-feedback H∞ control for a class of active quarter-car suspension systems with control delay. The dynamic system of the suspension systems is first formed in terms of the control objectives, i.e., ride comfort, road holding, suspension deflection, and maximum actuator control force. Then, the objective is to the design of the dynamic output-feedback H∞ controller in order to ensure asymptotic stability of the closed-loop system with H∞ disturbance attenuation level and the output constraints. Furthermore, using Lyapnov theory and linear matrix inequality (LMI) approach, the existence of admissible controllers is formulated in terms of LMIs. With these satisfied conditions, a desired dynamic output-feedback controller can be readily constructed. Finally, a quarter-vehicle model is exploited to demonstrate the effectiveness of the proposed method. © 1982-2012 IEEE.


Zhang X.,Hong Kong Polytechnic University | Wang L.,Hong Kong Polytechnic University | Xin J.,Hong Kong Polytechnic University | Yakobson B.I.,Rice University | And 2 more authors.
Journal of the American Chemical Society | Year: 2014

Synthesizing bilayer graphene (BLG), which has a band gap, is an important step in graphene application in microelectronics. Experimentally, it was broadly observed that hydrogen plays a crucial role in graphene chemical vapor deposition (CVD) growth on a copper surface. Here, by using ab initio calculations, we have revealed a crucial role of hydrogen in graphene CVD growth, terminating the graphene edges. Our study demonstrates the following. (i) At a low hydrogen pressure, the graphene edges are not passivated by H and thus tend to tightly attach to the catalyst surface. As a consequence, the diffusion of active C species into the area beneath the graphene top layer (GTL) is prohibited, and therefore, single-layer graphene growth is favored. (ii) At a high hydrogen pressure, the graphene edges tend to be terminated by H, and therefore, its detachment from the catalyst surface favors the diffusion of active C species into the area beneath the GTL to form the adlayer graphene below the GTL; as a result, the growth of BLG or few-layer graphene (FLG) is preferred. This insightful understanding reveals a crucial role of H in graphene CVD growth and paves a way for the controllable synthesis of BLG or FLG. Besides, this study also provides a reasonable explanation for the hydrogen pressure-dependent graphene CVD growth behaviors on a Cu surface. © 2014 American Chemical Society.


Wu Y.,Hong Kong Polytechnic University | Wong S.M.,Hong Kong Polytechnic University | Mao F.,Sun Yat Sen University | Chan T.L.,Hong Kong Polytechnic University | Kwong F.Y.,Hong Kong Polytechnic University
Organic Letters | Year: 2012

A C-H arylation with aryl chloride is made viable through a transition-metal-free approach. In the presence of a simple diol associating with KOt-Bu, various phenanthridine derivatives can be conveniently accessed. In particular, only 10 mol % of simple and inexpensive ethylene glycol is required for this protocol. These results represent the first general examples of aryl chloride/C-H coupling under transition-metal-free conditions. © 2012 American Chemical Society.


Gorla N.,American University of Sharjah | Somers T.M.,Wayne State University | Wong B.,Hong Kong Polytechnic University
Journal of Strategic Information Systems | Year: 2010

Increased organizational dependence on information systems drives management attention towards improving information systems' quality. A recent survey shows that "Improve IT quality" is one of the top concerns facing IT executives. As IT quality is a multidimensional measure, it is important to determine what aspects of IT quality are critical to organizations to help Chief Information Officers (CIOs) to devise effective IT quality improvement strategies. In this research, we model the relationship between information systems' (IS) quality and organizational impact. We hypothesize greater organizational impact in situations in which system quality, information quality and service quality are high. We also hypothesize a positive relationship between system quality and information quality. We test our hypotheses using survey data. Our structural equation model exhibits a good fit with the observed data. Our results show that IS service quality is the most influential variable in this model (followed by information quality and system quality), thus highlighting the importance of IS service quality for organizational performance. This paper contributes theoretically to IS success models through the system quality-to-information quality and IS quality-to-organizational impact links. Implications of our results for practice and research are discussed. © 2010 Elsevier B.V. All rights reserved.


Tse C.K.,Hong Kong Polytechnic University | Li M.,University of Tennessee at Knoxville
International Journal of Bifurcation and Chaos | Year: 2011

Bifurcation analysis has been applied to many power electronics circuits. Literature abounds with results regarding the various ways in which such circuits lose stability under variation of some selected parameters, e.g. via period-doubling bifurcation, Hopf bifurcation, border collision, etc. The current status of research in the identification of bifurcation behavior in power electronics has reached a stage where the salient types of bifurcation behavior, their underlying causes and the theoretical parameters affecting them have been well understood. Currently, the emphasis of research in this field has gradually shifted toward applications that are of direct relevance to practical design of power electronics. One direction is to apply some of the available research results in bifurcation behavior to the design of practical power electronics circuits. The main difficulty is that the abstract mathematical presentations of the available results are not directly applicable to practical design problems. In this paper we will discuss how research efforts may be directed to bridge this gap. © 2011 World Scientific Publishing Company.


Yakobson B.I.,Rice University | Ding F.,Hong Kong Polytechnic University
ACS Nano | Year: 2011

As the available length ranges expand, graphene begins to show its anticipated polycrystallinity. Its texture, revealed with modern comprehensive microscopy in recent work by Kim et al., includes coherent domains/grains oriented randomly yet with an intriguing degree of regularity. The domains are stitched together by pentagons and heptagons aligned into the grain boundaries. The challenge is now to deduce the mechanisms of formation based on observations and then to find ways to control the morphology toward useful properties and applications. © 2011 American Chemical Society.


Chen Z.W.,Xiamen University | Chen Z.W.,Hong Kong Polytechnic University | Xu Y.L.,Hong Kong Polytechnic University | Wang X.M.,CSIRO
Journal of Structural Engineering (United States) | Year: 2012

Long-span suspension bridges carrying both highway and railway have been built in wind-prone regions. The estimation of fatigue damage of such bridges under the long-term combined action of railway, highway, and wind loading represents a challenging task in consideration of randomness in multiple types of loading. This study presents a framework for fatigue reliability analysis of multiloading long-span suspension bridges equipped with structural health monitoring systems (SHMS), and the Tsing Ma suspension bridge in Hong Kong is taken as a case study. A limit-state function in the daily sum of m-power stress ranges is first defined for fatigue reliability analysis. Probabilistic models of railway, highway, and wind loading are established on the basis of the measurement data acquired from the SHMS. The daily stochastic stress responses induced by the multiple types of loading are simulated at the fatigue-critical locations of the bridge deck by using the finite-element method and Monte Carlo simulation (MCS) together with the loading probabilistic models established. The probability distribution of the daily sum of m-power stress ranges is estimated on the basis of the daily stochastic stress responses. The probability distribution of the sum of m-power stress ranges for a given time period is then evaluated in consideration of future traffic growth patterns. Finally, the fatigue failure probabilities of the bridge at the fatigue-critical locations are calculated for different time periods. The results demonstrate that the health condition of the Tsing Ma Bridge at the end of its design life will be satisfactory under current traffic conditions without growth but that attention should be paid to future traffic growth because it may lead to a much greater fatigue failure probability. © 2012 American Society of Civil Engineers.


Guo Z.,Tsinghua University | Zhang L.,Hong Kong Polytechnic University | Zhang D.,Hong Kong Polytechnic University
IEEE Transactions on Image Processing | Year: 2010

In this correspondence, a completed modeling of the local binary pattern (LBP) operator is proposed and an associated completed LBP (CLBP) scheme is developed for texture classification. A local region is represented by its center pixel and a local difference sign-magnitude transform (LDSMT). The center pixels represent the image gray level and they are converted into a binary code, namely CLBP-Center (CLBP-C), by global thresholding. LDSMT decomposes the image local differences into two complementary components: The signs and the magnitudes, and two operators, namely CLBP-Sign (CLBP-S) and CLBP-Magnitude (CLBP-M), are proposed to code them. The traditional LBP is equivalent to the CLBP-S part of CLBP, and we show that CLBP-S preserves more information of the local structure than CLBP-M, which explains why the simple LBP operator can extract the texture features reasonably well. By combining CLBP-S, CLBP-M, and CLBP-C features into joint or hybrid distributions, significant improvement can be made for rotation invariant texture classification. © 2010 IEEE.


Liu Y.-C.,University of Costa Rica | Loh C.-H.,National Taiwan University | Ni Y.-Q.,Hong Kong Polytechnic University
Earthquake Engineering and Structural Dynamics | Year: 2013

The objective of this paper is to develop an online system parameter estimation technique from the response measurements through using the recursive covariance-driven stochastic subspace identification (SSI-COV) approach. In developing the recursive SSI-COV, to avoid time-consumption of singular value decomposition in recursive SSI, the extended instrumental variable version of the projection approximation subspace tracking method is used in SSI-COV. Besides, to reduce the effect of noise on the results of identification, the preprocessing of data using recursive singular spectrum analysis technique is also presented to remove the noise contaminant measurements to enhance the stability of data analysis. On the basis of the proposed method, both the ambient vibration and seismic response data of a tower (Canton Tower) are used to observe the time-varying system natural frequencies of a tower from its operating condition. Results from using off-line SSI-COV method under normal operating condition are also presented. Comparison on the identified time-varying dynamic characteristics of the tower under normal operating condition and earthquake response of distanced earthquake event is discussed. © 2012 John Wiley & Sons, Ltd..


Wu Y.,Hong Kong Polytechnic University | Choy P.Y.,Hong Kong Polytechnic University | Mao F.,Sun Yat Sen University | Kwong F.Y.,Hong Kong Polytechnic University
Chemical Communications | Year: 2013

A palladium-catalyzed cascade cross-coupling of acetanilide and toluene for the synthesis of ortho-acylacetanilide is described. Toluene derivatives can act as effective acyl precursors (upon sp3-C-H bond oxidation by a Pd/TBHP system) in the oxidative coupling between two C-H bonds. This dehydrogenative Pd-catalyzed ortho-acylation proceeds under mild reaction conditions. © 2013 The Royal Society of Chemistry.


Li X.,Tsinghua University | Po-An Hsieh J.J.,Hong Kong Polytechnic University | Rai A.,Georgia State University
Information Systems Research | Year: 2013

We identify two post-acceptance information system (IS) usage behaviors related to how employees leverage implemented systems. Routine use (RTN) refers to employees' using IS in a routine and standardized manner to support their work, and innovative use (INV) describes employees' discovering new ways to use IS to support their work. We use motivation theory as the overarching perspective to explain RTN and INV and appropriate the rich intrinsic motivation (RIM) concept from social psychology to propose a conceptualization of RIM toward IS use, which includes intrinsic motivation toward accomplishment (IMap), intrinsic motivation to know (IMkw), and intrinsic motivation to experience stimulation (IMst). We also consider the influence of perceived usefulness (PU)-a representative surrogate construct of extrinsic motivation toward IS use-on RTN and INV. We theorize the relative impacts of the RIM constructs and PU on RTN and INV and the role of personal innovativeness with IT (PIIT) in moderating the RIM constructs' influences on INV. Based on data from 193 employees using a business intelligence system at one of the largest telecom service companies in China, we found (1) PU had a stronger impact on RTN than the RIM constructs, (2) IMkw and IMst each had a stronger impact on INV than either PU or IMap, and (3) PIIT positively moderated the impact of each RIM construct on INV. Our findings provide insights on managing RTN and INV in the post-acceptance stage. © 2013 Informs.


Wang F.,Sun Yat Sen University | Lai X.,Hong Kong Polytechnic University | Shi N.,Sun Yat Sen University
Decision Support Systems | Year: 2011

In this paper, we study a supply chain network design problem with environmental concerns. We are interested in the environmental investments decisions in the design phase and propose a multi-objective optimization model that captures the trade-off between the total cost and the environment influence. We conduct a comprehensive set of numerical experiments. The results show that our model can be applied as an effective tool in the strategic planning for green supply chain. Meanwhile, the sensitivity analysis provides some interesting managerial insights for firms. © 2010 Elsevier B.V. All rights reserved.


Wu Y.,Sun Yat Sen University | Li B.,Hong Kong Polytechnic University | Mao F.,Sun Yat Sen University | Li X.,Sun Yat Sen University | Kwong F.Y.,Hong Kong Polytechnic University
Organic Letters | Year: 2011

A palladium-catalyzed oxidative C-H bond functionalization/ortho-acylation of acetanilides using easily accessible aldehyde as the acyl source is described. In the presence of a Pd(TFA)2 catalyst and tert-butylhydroperoxide at 90 °C in general, an array of ortho-acylacetanilides can be afforded in good yields. © 2011 American Chemical Society.


Zhang X.,Hong Kong Polytechnic University | Chen Y.L.,National Taiwan University | Liu R.-S.,National Taiwan University | Tsai D.P.,National Taiwan University | Tsai D.P.,Academia Sinica, Taiwan
Reports on Progress in Physics | Year: 2013

Plasmonic photocatalysis has recently facilitated the rapid progress in enhancing photocatalytic efficiency under visible light irradiation, increasing the prospect of using sunlight for environmental and energy applications such as wastewater treatment, water splitting and carbon dioxide reduction. Plasmonic photocatalysis makes use of noble metal nanoparticles dispersed into semiconductor photocatalysts and possesses two prominent features - a Schottky junction and localized surface plasmonic resonance (LSPR). The former is of benefit to charge separation and transfer whereas the latter contributes to the strong absorption of visible light and the excitation of active charge carriers. This article aims to provide a systematic study of the fundamental physical mechanisms of plasmonic photocatalysis and to rationalize many experimental observations. In particular, we show that LSPR could boost the generation of electrons and holes in semiconductor photocatalysts through two different effects - the LSPR sensitization effect and the LSPR-powered bandgap breaking effect. By classifying the plasmonic photocatalytic systems in terms of their contact form and irradiation state, we show that the enhancement effects on different properties of photocatalysis can be well-explained and systematized. Moreover, we identify popular material systems of plasmonic photocatalysis that have shown excellent performance and elucidate their key features in the context of our proposed mechanisms and classifications. © 2013 IOP Publishing Ltd.


Penev E.S.,Rice University | Artyukhov V.I.,Rice University | Ding F.,Hong Kong Polytechnic University | Yakobson B.I.,Rice University
Advanced Materials | Year: 2012

Recent research progress in nanostructured carbon has built upon and yet advanced far from the studies of more conventional carbon forms such as diamond, graphite, and perhaps coals. To some extent, the great attention to nano-carbons has been ignited by the discovery of the structurally least obvious, counterintuitive, small strained fullerene cages. Carbon nanotubes, discovered soon thereafter, and recently, the great interest in graphene, ignited by its extraordinary physics, are all interconnected in a blend of cross-fertilizing fields. Here we review the theoretical and computational models development in our group at Rice University, towards understanding the key structures and behaviors in the immense diversity of carbon allotropes. Our particular emphasis is on the role of certain transcending concepts (like elastic instabilities, dislocations, edges, etc.) which serve so well across the scales and for chemically various compositions. Copyright © 2012 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim.


Zhu Q.Y.,Sun Yat Sen University | Li Y.,Hong Kong Polytechnic University
International Journal of Heat and Mass Transfer | Year: 2010

The liquid water transport coupled with moisture and heat transfer through porous textiles is a complicated process involving simultaneous, coupled heat and mass transfers. The flows in porous textiles are different from the traditional flows transfer in porous media due to the adsorption of moisture by fibers. Based on the Poisson-Boltzmann equation for electric double layers and Navier-Stokes equation for liquid flows, a mathematical model for describing resistance effects of electric double layer (EDL) on the coupled heat and liquid moisture transfer in porous textiles is developed. The resistance effect of the EDL in porous textiles can be measured by a dimensionless number, which is called electric resistance number. It is proportional to the square of the liquid dielectric constant, the solid surface zeta potential and inversely proportional to the liquid dynamic viscosity, electric conductivity and the square of the effective pore size. With specification of initial and boundary conditions, the distributions of the temperature, moisture concentration, and liquid water content in porous textiles have been obtained. The theoretical predictions are compared with experimental data, and good agreement is observed between the two, indicating that the heat and mass transfer process are influenced by the EDL in porous textiles. © 2009 Elsevier Ltd. All rights reserved.


Lam K.,Hong Kong Polytechnic University | Zou L.,Wuhan University of Technology
Journal of Fluids and Structures | Year: 2010

This paper presents a numerical study of three-dimensional (3-D) laminar flow around four circular cylinders in an in-line square configuration. The investigation focuses on effects of spacing ratio (L/D) and aspect ratio (H/D) on 3-D flow characteristics, and the force and pressure coefficients of the cylinders. Extensive 3-D numerical simulations were performed at Reynolds number of 200 for L/D from 1.6 to 5.0 at H/D=16 and H/D from 6 to 20 at L/D=3.5. The results show that the 3-D numerical simulations have remedied the inadequacy of 2-D simulations and the results are in excellent agreement with the experimental results. The relation between 3-D flow patterns and pressure characteristics around the four cylinders is examined and discussed. The critical spacing ratio for flow pattern transformation was found to be L/D=3.5 for H/D=16, while a bistable wake pattern was observed at L/D=1.6 for the same aspect ratio. Moreover, a transformation of flow pattern from a stable shielding flow pattern to a vortex shedding flow pattern near the middle spanwise positions of the cylinders was observed and was found to be dependent on the aspect ratio, spacing ratio, and end wall conditions. Due to the highly 3-D nature of the flows, different flow patterns coexist over different spanwise positions of the cylinders even for the same aspect ratio. It is concluded that spacing ratio, aspect ratio, and the no-slip end wall condition have important combined effects on free shear layer development of the cylinders and hence have significant effects on the pressure field and force characteristics of the four cylinders with different spacing ratios and aspect ratios. © 2010 Elsevier Ltd.


Zhang J.,Tsinghua University | Chung C.Y.,Hong Kong Polytechnic University | Han Y.,Tsinghua University
IEEE Transactions on Power Systems | Year: 2012

The residue method has been widely used for tuning power system stabilizers (PSSs) in large power systems to improve the damping of interarea oscillations. However, an additional PSS installation may affect the performance of existing PSSs due to interactions among different modes. When contending with several interarea oscillations, compromise among different modes becomes necessary. In this paper, a novel method based on modal decomposition is proposed for tuning PSSs for damping of the concerned interarea mode, while minimizing its effect on other modes by weakening the interactions among different modes. Design considerations, PSS structure and tuning procedure are formulated. The performance of the proposed method has been validated based on a two-area four-machine system and an actual large power system, China Southern Grid. © 1969-2012 IEEE.


Wang F.,Sun Yat Sen University | Xu Z.,Hong Kong Polytechnic University
Journal of Heuristics | Year: 2013

This paper studies a robust graph coloring problem, which is a variant of the classical graph coloring problem, where penalties are charged for non-adjacent vertices that are assigned the same color. The problem can be formulated as an unconstrained quadratic programming problem, and has many applications in industry. Since the problem is known to be strongly NP-complete, we develop a number of metaheuristics for it, which are based on various encoding schemes, neighborhood structures, and search algorithms. Extensive experiments suggest that our metaheuristics with a partition based encoding scheme and an improvement graph based neighborhood outperform other methods tested in our study. © 2011 Springer Science+Business Media, LLC.


Chiu C.-H.,Hong Kong Polytechnic University | Choi T.-M.,Hong Kong Polytechnic University | Tang C.S.,University of California at Los Angeles
Production and Operations Management | Year: 2011

Channel rebates and returns policies are common mechanisms for manufacturers to entice retailers to increase their order quantities and sales ultimately. However, when the underlying demand depends on the retail price, it has been known that channel coordination cannot be achieved if only one of these mechanisms is deployed. In this article, we show that a policy that combines the use of wholesale price, channel rebate, and returns can coordinate a channel with both additive and multiplicative price-dependent demands. In addition to determining the sufficient conditions for the contract parameters associated with the equilibrium policy, we show that multiple equilibrium policies for channel coordination exist. We further explore how the equilibrium policy can be adjusted to achieve Pareto improvement. Other issues such as the maximum amount of expected profit that the manufacturer can share under the coordinated channel, the structural properties of the contracts under both the additive and multiplicative price-dependent demand functions are also discussed. © 2010 Production and Operations Management Society.


Patent
McGill University, Hong Kong Polytechnic University and Wayne State University | Date: 2010-12-15

Synthetic polyphenolic compounds of formula (I), their modes of synthesis, and pharmaceutical compositions thereof are provided herein. Use of the compounds and compositions described herein for inhibiting proteasomal activity and for treating cancer is also provided.


Patent
Hong Kong Polytechnic University, McGill University, University of South Florida and Wayne State University | Date: 2015-09-15

A method of reducing tumor cell growth, the method including administering an effective amount of a compound having the formula:


Patent
Hong Kong Polytechnic University, McGill University, University of South Florida and Wayne State University | Date: 2014-03-28

A method of reducing tumor cell growth, the method including administering an effective amount of a compound having the formula:


Patent
Hong Kong Polytechnic University, McGill University, University of South Florida and Wayne State University | Date: 2012-03-09

A method of reducing tumor cell growth, the method including administering an effective amount of a compound having the formula:


Grant
Agency: European Commission | Branch: FP7 | Program: CSA-CA | Phase: SiS-2008-1.2.2.1 | Award Amount: 1.02M | Year: 2009

RISE is a CSA (coordinating), which aims to promote pan-European and International Awareness on Ethical Aspects of Biometrics and Security Technologies. In particular the project aims to deepen, enlarge, and ensure continuity to transnational (European) and international dialogue already instigated by the international conferences on ethics and biometrics organised by the EC DG Research and the US DHS Privacy Office respectively in Brussels and Washington DC in 2005 and 2006. RISEs point is the new political landscape created by the Treaty of Lisbon of the European Union. The EU is now on the verge of a multifaceted reform of its decision-making rules for security, which may have deep ethical and political implications. RISE will address this issue.


Patent
Wayne State University, McGill University and Hong Kong Polytechnic University | Date: 2012-06-15

Synthetic polyphenolic compounds of formula (I), their modes of synthesis, and pharmaceutical compositions thereof are provided herein. Use of the compounds and compositions described herein for treating cancer and for treating metabolic disorders is also provided.


The Hong Kong Polytechnic University (PolyU) is proud to unveil the plaque today (30 November) for the "PolyU-Huawei Joint Laboratory for Optical Interconnection Network and Advanced Computing System" (Joint Lab).


News Article | December 1, 2016
Site: www.prweb.com

The Hong Kong Polytechnic University (PolyU) is proud to unveil the plaque for the “PolyU-Huawei Joint Laboratory for Optical Interconnection Network and Advanced Computing System” (Joint Lab). This is the first joint laboratory of high-capacity optical communications and advanced computing systems in Hong Kong, fostering PolyU’s continuous partnership with Huawei Technologies Co. Ltd. (Huawei). The plaque unveiling ceremony was officiated by Ir Professor Alex Wai, Vice President (Research Development), PolyU and Mr. Jun Zha, President, Central Research Institute of Huawei. Through the Joint Lab, PolyU and Huawei will work on research relating to high-capacity optical communication systems including long-haul and short-reach data center transmission systems, computer networks and systems, and big data computing. It aims to pioneer the research in the field of optical communication systems and advanced computing systems by leveraging synergy of the industry and the university. It targets bolstering significantly the capacity of internet systems through technological breakthroughs, as well as developing system infrastructure and algorithmic solutions for computing-driven innovation. “The PolyU-Huawei Joint Lab for Optical Interconnection Network and Advanced Computing System was established to combine PolyU’s strength in applying technological innovation and Huawei’s leadership in the industry with an objective to develop high-capacity optical communication systems. It will enable a breakthrough in high-impact data technology to increase internet traffic significantly,” said Professor Wai at the ceremony. PolyU’s collaboration with Huawei has commenced since 2007. Their joint efforts have contributed to the establishment of the first 100Gbit/s per wavelength optical communication system in China. Research experts from different PolyU academic and research units, including Department of Electronic and Information Engineering, Department of Electrical Engineering, Department of Computing, Interdisciplinary Division of Biomedical Engineering, Department of Applied Mathematics and Department of Applied Physics, are engaged in the numerous collaborative projects between PolyU and Huawei. The research areas include but are not limited to communication, big data, crowdsourcing platforms, mobile networks, wearable devices, algorithms as well as materials. It is hoped that with the establishment of the Joint Lab, the scope of collaboration could be further extended in both breadth and depth. “The PolyU-Huawei Joint Lab will further integrate the advantages and strengths of the university and the enterprise in the area of innovative research and this collaboration will enhance our research ability. By building together a platform to share resources for innovation, the Joint Lab will enable our complementary development so as to achieve impactful R&D outputs and to jointly nurture talents of high caliber. This will result in increased global competitiveness and a win-win situation,” said Mr Zha. Through close collaboration, PolyU and Huawei will be able to further develop high-impact translational research and next-generation technological advances in the telecommunications and advanced computing industry.


News Article | April 28, 2016
Site: www.rdmag.com

Insulin deficiency and hyperglycemia are two well-known culprits behind diabetes, both of which are reflected in blood glucose concentrations. Now, researchers are working to create ultrasensitive lab-on-a-chip devices to quickly measure glucose concentrations with the goal of developing device for early diagnosis and prevent of diabetes A team of researchers from The Hong Kong Polytechnic University and Zhejiang University in China report integrating fiber optic glucose sensors into a microfluidic chip to create portable, high-performance, low-cost devices for measuring glucose levels. In a paper published this week in the journal Biomedical Optics Express, from The Optical Society (OSA). 'Today, photonic approaches are recognized as the most promising techniques for ultrasensitive sensing," said Dr. A. Ping Zhang, associate professor, Department of Electrical Engineering, The Hong Kong Polytechnic University. "In particular, the synergistic integration of photonic sensing and microfluidics led to the state-of-the-art technology known as optofluidics for biological and chemical analysis." One reason microfluidic chip technology is so appealing is that it provides a tiny platform to integrate sensors with functional components, such as microfluidic mixers, in order to achieve a lab-on-a-chip analysis system for fast and reliable results. While electrochemical glucose biosensors can be integrated into microfluidic channels to develop easy-to-handle, low-cost, and portable microfluidic chips, electroactive interference problems often appear in electrochemical sensors. But fiber optic sensors offer a solution to this issue, thanks to their immunity to electromagnetic interference. By combining a new fiber optic biosensor with a microfluidic chip, Zhang and colleagues created an interference-free optofluidic device for ultrasensitive detection of glucose levels. Their method involves fabricating an optical fiber long-period grating (LPG) with a period of 390 microns within a small-diameter optical fiber with a cladding diameter of 80 microns, he explained. Such fiber optic devices induce strong co-directional mode coupling through a resonant scattering process. And the resulting central wavelength is very sensitive to changes of the refractive index (RI) of the surrounding media via the evanescent field of optical fiber cladding mode. "To transform the fiber optic RI sensor into a glucose sensor, the team selected glucose oxidase as a sensing material that would react with glucose in solution. To support the sensing film and magnify RI change, a pH-responsive multilayer film of polyethylenimine (PEI) and polyacrylic acid (PAA) is deposited on the side surface of the LPG sensor before immobilization of the sensing film," Zhang noted. The PEI/PAA multilayer film surveils the oxidation of glucose with the gluclose oxidase catalyst and responds to the reaction via swelling or contracting," he added. "Experimental results revealed that the new fiber optic sensor is very sensitive on its own and can detect glucose oxidase concentrations as low as 1 nM (10-9 molarity)," he said. "But, after integration into the microfluidic chip, the sensor's performance was remarkably further improved in terms of detection range and response time." "Also, notably, no significant loss of biomolecular activity was observed during the experiments, which implies that our layer-by-layer self-assembly technique renders a robust electrostatic absorption of glucose oxidase within the sensing film,"Zhang said. "The team's work is a significant step toward developing optofluidic devices for the early diagnosis and prevention of diabetes," he said. In terms of applications, the optofluidic device enables detection of glucose in solution "requiring only a tiny droplet of sweat. This makes it an extremely appealing technology to develop for early diagnosis of diabetes via monitoring glucose content within sweat," Zhang said. Their ultimate goal is to develop multifunctional "lab-on-a-chip devices" through the integration of photonics, microfluidics, and functional materials onto a small chip. Such a technology will enable a broad range of research and development in biomedical diagnostics, environmental monitoring and even aid drug discovery," he noted.


Wong C.Y.,University of Hull | Boon-Itt S.,Thammasat Business School | Wong C.W.Y.,Hong Kong Polytechnic University
Journal of Operations Management | Year: 2011

This paper extends prior supply chain research by building and empirically testing a theoretical model of the contingency effects of environmental uncertainty (EU) on the relationships between three dimensions of supply chain integration and four dimensions of operational performance. Based on the contingency and organizational information processing theories, we argue that under a high EU, the associations between supplier/customer integration, and delivery and flexibility performance, and those between internal integration, and product quality and production cost, will be strengthened. These theoretical propositions are largely confirmed by multi-group and structural path analyses of survey responses collected from 151 of Thailand's automotive manufacturing plants. This paper contributes to operations management contingency research and provides theory-driven and empirically proven explanations for managers to differentiate the effects of internal and external integration efforts under different environmental conditions. © 2011 Elsevier B.V.


Chan F.T.S.,Hong Kong Polytechnic University | Chan H.K.,University of East Anglia
Expert Systems with Applications | Year: 2011

Determining the proper storage locations for potentially thousands of products is one major task that faces the warehouse manager during the design of a new warehouse or the refurbishment of existing facility. There are many factors affects the storage assignment. For example, order picking method, size and layout of the storage system, material handling system, product characteristics, demand trends, turnover rates and space requirements. Selecting appropriate storage assignment policies (i.e. random, dedicated or class-based) and routing methods (i.e. transversal, return or combined) with regards to above factors is a possible solution to tackle this problem. However, the efficiency of these policies is interdependent. This paper aims to present a simulation study of a real case regarding storage assignment problem of a manual-pick and multi-level rack warehouse. Performance of the case is measured in terms of travel distance and order retrieval time. The results of the study indicate that the key to effective implementation of a storage assignment system is to match the types of warehouse storage system and the variety of items in the customer order. Also, the use of key performance indicator should clearly reflect the needs of the warehouse. © 2010 Elsevier Ltd. All rights reserved.


Ai Z.,Central China Normal University | Ai Z.,Hong Kong Polytechnic University | Ho W.,Nano and Advanced Materials Institute Ltd | Lee S.,Hong Kong Polytechnic University
Journal of Physical Chemistry C | Year: 2011

In this study, we demonstrate that bismuth oxybromide and graphene nanocomposites (BGCs) exhibit superior performance on photocatalytic removal of gaseous nitrogen monoxide (NO) to pure BiOBr under visible light irradiation (λ > 420 nm). The photocatalytic NO removal rate constant of BGCs was 2 times that of pure BiOBr. The BGCs were prepared by a facile solvothermal route with using graphene oxide (GO), bismuth nitrite, and cetyltrimethyl ammonium bromide (CTAB) as the precursors. During the synthesis, both of the reduction of GO and the formation of BiOBr nanocrystals were achieved simultaneously. On the basis of the characterization results, we attributed the enhanced photocatalytic activity of the BGCs nanocomposites to more effective charge transportations and separations arisen from the strong chemical bonding between BiOBr and graphene, not to their light absorption extension in the visible region and higher surface area. © 2011 American Chemical Society.


Chung S.H.,Hong Kong Polytechnic University | Chan H.K.,University of East Anglia
IEEE Transactions on Industrial Electronics | Year: 2012

The economic lot scheduling problem (ELSP) has been studied over 50 years. ELSP is known as NP-hard and hence heuristic algorithms have been developed. In those heuristics, researchers generally adopted two types of rounding-off methods for the production frequency of products, namely, the nearest integer and power-of-two approaches. The production frequency of products defines the number of times that such product being produced during the cycle. Therefore, different production frequency actually leads to different optimization results even for the same set of products. For this reason, this paper proposes a two-level genetic algorithm to deal with this problem. A number of numerical examples found in literature and randomly generated problem sets are used to test and benchmark the performance of the new approach. The comparison shows that the new approach outperforms the other existing approaches and also demonstrates the significance of the production frequency to the optimization results. © 2011 IEEE.


Chan H.K.,University of East Anglia | Chan F.T.S.,Hong Kong Polytechnic University
Decision Support Systems | Year: 2010

Supply chains need to be flexible and adaptive because their operations are always subject to a variety of uncertainties like customer demand and supplier capacity, particularly for Make-to-Order (MTO) supply chains since their flow of materials is only triggered by customer orders. The main objective of this paper is to study how flexibility and adaptability in delivery quantity and due date can improve the performance in a network of two-level multi-product MTO supply chains. Effect of uncertain customer demand and also supplier capacity, and supplier's capacity utilization are studied. Flexibility and adaptability are realized based on two proposed coordination mechanisms. Agent-based simulation is employed in this study to model the operations of supply chains. Performance of the system is measured in terms of a number of cost items and customer demand fill rate. Simulation results indicate that introduction of such flexibility and adaptability can improve the aforementioned performance. However, there is a trade-off in selecting the coordination mechanism between adaptability and flexibility subject to capacity utilization. Details and concluding remarks are discussed in this paper. © 2009 Elsevier B.V. All rights reserved.


Ke D.P.,Hong Kong Polytechnic University | Chung C.Y.,Hong Kong Polytechnic University | Xue Y.,State Grid Corporation of China
IEEE Transactions on Power Systems | Year: 2011

An eigenstructure-based performance index is proposed in this paper to measure the dynamic performance of the system as well as control efforts. Calculation of this index is based on eigenstructure of the closed loop system and the design parameters; it does not rely on control structures. Therefore, this index can be applied for solving structurally constrained control problems. A tuning scheme based on this index is proposed for coordinating power system stabilizers (PSSs) and supplementary damping controllers (SDCs) for flexible AC transmission systems (FACTS) devices to damp inter-area oscillations of systems and to optimize their control efforts under multiple operating conditions. Both PSSs and SDCs utilize control structures as a low order single-input-single- output phase lead-lag compensator. Wide-area signals are employed to upgrade their effectiveness in damping inter-area oscillations. Time delays caused by usage of wide-area signals are also considered in the tuning scheme. Results of simulation on a four-machine two-area system and the New England and New York interconnected system show that the proposed index is effective in measuring dynamic performance of the system and the coordinatedly tuned PSSs and SDCs based on this index can robustly damp inter-area oscillations of systems with optimized control efforts. © 2006 IEEE.


Li Q.,Hong Kong Polytechnic University | Li Q.,Jiangnan University | Loke A.Y.,Hong Kong Polytechnic University
Psycho-Oncology | Year: 2013

Objective: Although there is a vast body of studies exploring the negative aspects of spousal caregiving for cancer patients, there have also been reports on the positive aspects. The objective of this review was to summarize and appraise the positive aspects of spousal caregiving and to identify directions for future research. Methods: A systematic search was conducted to identity articles published in English or Chinese from January 1996 to July 2012. Studies were located using an electronic search, a manual search, and an author search. Results: A total of 35 articles were identified and included in this review. The focus of these studies and their results were described on the basis of the Conceptual Framework of the Positive Aspects of Caregiving. The findings revealed that spousal caregivers for cancer patients experienced various positive aspects of caregiving, such as an enhanced relationship with the care-receiver, the feeling of being rewarded, a sense of personal growth, and a perception of personal satisfaction. Daily enrichment events and self-efficacy on the part of the caregivers were identified as the determining factors in the positive aspects of caregiving. Conclusions: All of the three domains of the positive aspects of caregiving are interdependent and worked together to contribute to the positive outcomes experienced by spousal caregivers. An intervention program specially designed to enhance the positive aspects of caregiving will support spouses caring for cancer patients. Copyright © 2013 John Wiley & Sons, Ltd.


Zeng S.,Xiangtan University | Zeng S.,Hong Kong Polytechnic University | Xiao J.,Xiangtan University | Yang Q.,Xiangtan University | Hao J.,Hong Kong Polytechnic University
Journal of Materials Chemistry | Year: 2012

In this paper, fluorescent and magnetic bi-functional NaLuF 4:Ln (Ln = Gd 3+, Yb 3+, Tm 3+) nanocrystals were synthesized via a simple hydrothermal method using oleic acid as capping ligand. The crystal phase, size, upconversion (UC) properties, and magnetization of the nanocrystals can be readily modified by doping with Gd 3+. The results reveal that Gd 3+ addition can promote the transformation from the cubic to the hexagonal phase and reduce the size. In addition, NaLuF 4:Ln (Ln = Gd 3+, Yb 3+, Tm 3+) nanocrystals present efficient near infrared (NIR) to NIR emission, which is beneficial for in vivo biomedical applications due to the increased penetration depth and low radiation damage of NIR light in bio-tissues. More importantly, owing to the large magnetic moment of Gd 3+, the Gd 3+-doped NaLuF 4 nanocrystals also present excellent paramagnetic properties at room temperature. Therefore, it is expected that these nanocrystals can be used as promising dual-modal nanoprobes for optical bioimaging and magnetic resonance imaging (MRI), and may have potential applications in bioseparation. © 2012 The Royal Society of Chemistry.


Ai Z.,Central China Normal University | Lee S.,Hong Kong Polytechnic University
Applied Surface Science | Year: 2013

In this study, hierarchical monoclinic BiVO4 three-dimensional (3D) superstructures with two kinds of morphologies, namely BiVO4 microboats and BiVO4 microspheres, have been controllably synthesized by adjusting reaction time in the template-free hydrothermal process using ethylene glycol as solvent. The nucleation, growth, and self-assembly of the BiVO4 superstructures could be readily controlled with reaction time, which brought different morphologies to the final product. The as-prepared BiVO4 superstructures were characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM), nitrogen adsorption-desorption experimentation, and UV-vis diffuse reflectance spectra (UV-vis DRS). The monoclinic 3D BiVO4 catalysts are composed of two-dimensional (2D) nanoplates which intercross with each other. Nanoplates were firstly formed by aggregation of primary nanocrystallites and then self-assembly converted to microboats and microspheres via the oriented attachment mechanism. The prepared BiVO4 3D catalysts can respond to visible light and their optical and photocatalytic properties are relevant to their morphologies. The BiVO4 microspheres showed superior photocatalytic activity on removal of gaseous NO compared to the BiVO 4 microboats. The morphology-dependent photocatalytic property of the BiVO4 superstructures is discussed. This work suggests that the synthesized BiVO4 micropheres are promising photocatalyst for environmental remediation. ©2013 Elsevier B.V. All rights reserved.


Zuo W.,Harbin Institute of Technology | Zuo W.,Hong Kong Polytechnic University | Zhang L.,Hong Kong Polytechnic University | Song C.,Harbin Institute of Technology | Zhang D.,Hong Kong Polytechnic University
Proceedings of the IEEE Computer Society Conference on Computer Vision and Pattern Recognition | Year: 2013

Image denoising is a classical yet fundamental problem in low level vision, as well as an ideal test bed to evaluate various statistical image modeling methods. One of the most challenging problems in image denoising is how to preserve the fine scale texture structures while removing noise. Various natural image priors, such as gradient based prior, nonlocal self-similarity prior, and sparsity prior, have been extensively exploited for noise removal. The denoising algorithms based on these priors, however, tend to smooth the detailed image textures, degrading the image visual quality. To address this problem, in this paper we propose a texture enhanced image denoising (TEID) method by enforcing the gradient distribution of the denoised image to be close to the estimated gradient distribution of the original image. A novel gradient histogram preservation (GHP) algorithm is developed to enhance the texture structures while removing noise. Our experimental results demonstrate that the proposed GHP based TEID can well preserve the texture features of the denoised images, making them look more natural. © 2013 IEEE.


Ling T.-C.,Hong Kong Polytechnic University | Ling T.-C.,University of Birmingham | Poon C.-S.,Hong Kong Polytechnic University
Journal of Cleaner Production | Year: 2012

The rapid development of the electronic industry has led to a growing hazardous waste management and disposal problem related to the management of cathode ray tube (CRT) waste. This study aimed to compare the feasibility of using CRT recycled glass: non-treated funnel glass (n-TFG, crushed without treatment) and treated funnel glass (TFG, crushed and treated with acid nitric to remove lead on the glass surface) as fine aggregates in cement mortar. Fresh and hardened properties of the cement mortars, including their x-ray radiation shielding and potential lead leaching were investigated. The mortar prepared with crushed beverage glass (CBG, lead-free) was also evaluated for comparison purposes. The experimental results show that the use of glass cullets, irrespective of glass type, improved the fluidity and drying shrinkage but reduced the strength. About 60% enhancement in x-ray radiation shielding property was achieved with the use of 100% CRT glass in the cement mortar owing to the increase of mortar density due to the presence of lead in the CRT glass. Furthermore, lead leaching (based on TCLP test) from the mortar samples prepared with the TFG complied with the regulatory limits. The results have demonstrated that the CRT glass (an original hazardous material) can be treated, processed, and re-utilized for making cement mortars. The mechanical performance of the cement mortar is comparable to that made with beverage glass. © 2012 Elsevier Ltd. All rights reserved.


Chen S.,University of Florida | Zhang M.,University of Florida | Xiao B.,Hong Kong Polytechnic University
Proceedings - IEEE INFOCOM | Year: 2011

Similar to the revolutionary change that the barcode system brought to the retail industry, the RFID technologies are expected to revolutionize the warehouse and inventory management. After RFID tags are deployed to make the attached objects wirelessly identifiable, a natural next step is to invent new ways to benefit from this "infrastructure". For example, sensors may be added to these tags to gather real-time information about the state of the objects or about the environment where these objects reside. This leads to the problem of designing efficient protocols to collect such information from the tags. It is a new problem that the existing work cannot solve well. In this paper, we first show that a straightforward polling solution will not be efficient. We then propose a single-hash information collection protocol that works much better than the polling solution. However, a wide gap still exists between the execution time of this protocol and a lower bound that we establish. Finally, we propose a multi-hash information collection protocol that further reduces the expected execution time to within 1.61 times the lower bound. © 2011 IEEE.


Zhang X.,Hong Kong Polytechnic University | Shen L.,Chongqing University | Zhang L.,Harbin Institute of Technology
Renewable and Sustainable Energy Reviews | Year: 2013

The generation of significant amount of emissions from building construction process has led the promotion of controlling emissions as an important strategy for implementing sustainable development principles in the built environment. The emissions incurred during various stages include carbon dioxide, methane, nitrous oxide, sulphur dioxide, carbon monoxide, nitrogen oxide, non methane volatile organic compounds and particulate matter. This paper conducts the life cycle assessment of the air emissions by using a particular case to examine emissions during construction stage. This study examines the emissions sources in each of the six stages and presents an inventory analysis method to measure air emissions to quantify the air emissions during the six life cycle stages for buildings. This method can help evaluating the impacts of implementing a building on the air quality, thus actions can be taken in early stages to reduce the environmental impacts during building life cycle. A case study is presented to demonstrate the practical application of the method with reference to the building practices for all life cycle stages in Hong Kong. © 2012 Elsevier Ltd.


Li Q.,Jiangnan University | Loke A.Y.,Hong Kong Polytechnic University
Cancer Nursing | Year: 2015

Background: With the research focus on family caregiving shifting from the individual to the dyadic level, there is a need to develop a conceptual framework that focused on caregiver-patient dyads. Objective: The aim of this study was to develop a preliminary conceptual framework for cancer couple dyads, to "Live With Love." Methods: A literature search was conducted among 4 electronic databases to identify couple-based intervention studies related to couples coping with cancer. This report differs from a traditional literature review in that we synthesized the models or frameworks used in these studies rather than the outcomes of the studies. A preliminary Live With Love Conceptual Framework (P-LLCF) for cancer couple dyads was developed based on the conceptual frameworks adopted in related literature on spousal caregiving for patients with cancer. Results: This P-LLCF contains 3 domains: event situation, dyadic mediators, and caregiver-patient dyads (appraisal, coping, and adjustment/outcomes). The various components in this P-LLCF will work together to benefit the positive dyadic adjustment/outcomes of the spousal caregiver-patient dyads in the cancer dyads' journey of coping with cancer. Conclusions: This P-LLCF sheds new light on the study of cancer couple dyads. It will be potentially valuable for guiding the related research and development of interventions on cancer couple dyads. Implications for Practice: Future research is needed to assess the outcome of interventions that focus on different components. It is also needed to develop measurements to assess dyadic adjustment/outcomes in nursing practice. Copyright © 2015 Wolters Kluwer Health, Inc. All rights reserved.


Bian W.,Harbin Institute of Technology | Chen X.,Hong Kong Polytechnic University
SIAM Journal on Optimization | Year: 2013

In this paper, we propose a smoothing quadratic regularization (SQR) algorithm for solving a class of nonsmooth nonconvex, perhaps even non-Lipschitzian minimization problems, which has wide applications in statistics and sparse reconstruction. The proposed SQR algorithm is a first order method. At each iteration, the SQR algorithm solves a strongly convex quadratic minimization problem with a diagonal Hessian matrix, which has a simple closed-form solution that is inexpensive to calculate. We show that the worst-case complexity of reaching an ε scaled stationary point is O(ε-2). Moreover, if the objective function is locally Lipschitz continuous, the SQR algorithm with a slightly modified updating scheme for the smoothing parameter and iterate can obtain an ε Clarke stationary point in at most Oε-3) iterations. © 2013 Society for Industrial and Applied Mathematics.


Li Q.,Jiangnan University | Loke A.Y.,Hong Kong Polytechnic University
Psycho-Oncology | Year: 2014

Objective With the research focus on family caregiving shifting from the individual to the dyadic level, it is suggested that the caregiver-patient dyad as a unit be the focus and direction of caregiving interventions for families coping with cancer. The objectives in conducting this review were to explore the existing interventions for spousal couples coping with cancer in terms of type of intervention, contents, approach, and outcome measurements; and to identify directions for the development of interventions. Methods A systematic search of four databases was conducted to identify articles published in English or Chinese from the launch of the databases to March 2013. Studies were located using an electronic search, a manual search, and an author search. Results A total of 17 articles were identified and included in this review. These interventions focused mainly on patient caregiving and caregiver self care, and usually lasted for 6 weeks using a face-to-face group mode, with follow-up at around 3 months. The outcome measures can be grouped into three main dimensions: dyadic appraisal, dyadic coping, and dyadic adjustments. Positive outcomes were reported for these interventions, including improvements in communication, dyadic coping, the quality of life of both the patients and their partners, psychosocial distress, sexual functioning, and marital satisfaction. Conclusions These findings highlighted the positive outcomes of couple-based interventions that focus on couples coping with cancer. Future studies on couple-based interventions should be conducted in different cultures, such as in Asian countries. Collaboration between researchers and clinicians is crucial to ensure the development of effective and accessible supportive interventions targeting couples coping with cancer. Copyright © 2014 John Wiley & Sons, Ltd.


Fan Z.,Harbin Institute of Technology | Fan Z.,East China Jiaotong University | Xu Y.,Harbin Institute of Technology | Zhang D.,Hong Kong Polytechnic University
IEEE Transactions on Neural Networks | Year: 2011

The linear discriminant analysis (LDA) is a very popular linear feature extraction approach. The algorithms of LDA usually perform well under the following two assumptions. The first assumption is that the global data structure is consistent with the local data structure. The second assumption is that the input data classes are Gaussian distributions. However, in real-world applications, these assumptions are not always satisfied. In this paper, we propose an improved LDA framework, the local LDA (LLDA), which can perform well without needing to satisfy the above two assumptions. Our LLDA framework can effectively capture the local structure of samples. According to different types of local data structure, our LLDA framework incorporates several different forms of linear feature extraction approaches, such as the classical LDA and principal component analysis. The proposed framework includes two LLDA algorithms: a vector-based LLDA algorithm and a matrix-based LLDA (MLLDA) algorithm. MLLDA is directly applicable to image recognition, such as face recognition. Our algorithms need to train only a small portion of the whole training set before testing a sample. They are suitable for learning large-scale databases especially when the input data dimensions are very high and can achieve high classification accuracy. Extensive experiments show that the proposed algorithms can obtain good classification results. © 2011 IEEE.


Zhang D.,Hong Kong Polytechnic University | Zhang D.,Harbin Institute of Technology | Zuo W.,Harbin Institute of Technology | Yue F.,Harbin Institute of Technology
ACM Computing Surveys | Year: 2012

Palmprint images contain rich unique features for reliable human identification, which makes it a very competitive topic in biometric research. A great many different low resolution palmprint recognition algorithms have been developed, which can be roughly grouped into three categories: holistic-based, feature-based, and hybrid methods. The purpose of this article is to provide an updated survey of palmprint recognition methods, and present a comparative study to evaluate the performance of the state-of-the-art palmprint recognition methods. Using the Hong Kong Polytechnic University (HKPU) palmprint database (version 2), we compare the recognition performance of a number of holistic-based (Fisherpalms and DCT+LDA) and local feature-based (competitive code, ordinal code, robust line orientation code, derivative of Gaussian code, and wide line detector) methods, and then investigate the error correlation and score-level fusion performance of different algorithms. After discussing the achievements and limitations of current palmprint recognition algorithms, we conclude with providing several potential research directions for the future. © 2012 ACM.


Tsang Y.H.,Hong Kong Polytechnic University | El-Taher A.E.,Aston University
Laser Physics Letters | Year: 2011

Operation of a single-clad Dy3+-doped ZrF4-BaF2-LaF3-AlF3-NaF (ZBLAN) fiber laser operating at mid-infrared near 3 μm is presented. The laser is pumped by an Yb3+-doped silica fiber laser centered at 1088 nm. An output of near 0.1 W with a slope efficiency of up to 23% with respect to absorbed pump power was measured. The laser performance, theoretical modeling and laser spectrum of Dy fiber laser system with respect to various cavity losses are studied. The experimental slope efficiency is more than 4.5 times higher than the previous demonstration, and is 64% of the Stokes efficiency limit. The efficiency was improved by using cavity mirrors of reflectivities of 99 and 50%. The emission central wavelength and spectral width are found to be dependent on the pump power and output coupler, reflectivity. © 2011 by Astro Ltd., published exclusively by WILEY-VCH Verlag GmbH & Co. KGaA.


Xu Y.,Harbin Institute of Technology | Zhang D.,Hong Kong Polytechnic University | Yang J.,Nanjing University of Science and Technology | Yang J.-Y.,Nanjing University of Science and Technology
IEEE Transactions on Circuits and Systems for Video Technology | Year: 2011

In this paper, we propose a two-phase test sample representation method for face recognition. The first phase of the proposed method seeks to represent the test sample as a linear combination of all the training samples and exploits the representation ability of each training sample to determine M nearest neighbors for the test sample. The second phase represents the test sample as a linear combination of the determined M nearest neighbors and uses the representation result to perform classification. We propose this method with the following assumption: the test sample and its some neighbors are probably from the same class. Thus, we use the first phase to detect the training samples that are far from the test sample and assume that these samples have no effects on the ultimate classification decision. This is helpful to accurately classify the test sample. We will also show the probability explanation of the proposed method. A number of face recognition experiments show that our method performs very well. © 2011 IEEE.


Ling T.-C.,Hong Kong Polytechnic University | Ling T.-C.,University of Birmingham | Poon C.-S.,Hong Kong Polytechnic University
Construction and Building Materials | Year: 2013

The possible incorporation of phase change materials (PCMs) in building materials has attracted a lot of research interest worldwide due to the concern on global warming and the ability of PCMs to reduce energy consumption in building because of their thermal energy storage abilities. As a substance with a high heat of fusion, PCM is capable of storing and releasing large amounts of energy in the form of heat during its melting and solidifying processes at the specific transition temperature. For the past 20 years, significant research has been undertaken on the potential use of PCMs in concrete. The results showed that PCM-concrete has some useful characteristics such as better latent heat storage and thermal performance. On the other hand, PCMs have some negative impacts on the properties of concrete. However, the negative impacts can be minimized if an appropriate PCM and a suitable means of incorporation are employed during the production of the PCM-concrete. In this paper, a general review of different types of PCMs, means of their incorporation and the influence of PCMs on the properties of concrete at the fresh and hardened stages are reviewed. The stability of the PCMs, the problems in relation to using them in concrete, as well as their thermal performance in concrete are also presented. © 2013 Elsevier B.V.


Wang X.,University of East Anglia | Chan H.K.,University of East Anglia | Yee R.W.Y.,Hong Kong Polytechnic University | Diaz-Rainey I.,University of East Anglia
International Journal of Production Economics | Year: 2012

Green or environmental concerns are drawing more and more attention both in academia and industry. Careful deployment of green initiatives or policies could not only fulfil the requirements of environmental legislation but also lead to a competitive advantage for firms. Nevertheless, making optimal decisions in this regard is not easy. This is principally due to two reasons: (1) the qualitative nature of, and (2) the uncertainty associated with, the parameters involved in the decision-making process. Analytic hierarchy process could be a useful tool to tackle the first challenge because of its ability to handle both qualitative and quantitative variables (decision criteria). Unfortunately, this approach is inadequate at addressing the uncertainties common in real-life applications. This challenge is particularly noticeable in the fashion industry since demand is very volatile, and there are many uncertain variables associated with the whole supply chain. As a result, this paper blends fuzzy logic, which is a popular method of incorporating uncertain parameters into the decision-making process, with analytic hierarchy process to form a selection (decision-making) model for different green initiatives in the fashion industry. The rationale behind the model is to analyse the associated risk of different alternatives, subject to different factors, be they deterministic or not. A numerical example is included in this paper to demonstrate how the proposed model works. © 2011 Elsevier B.V. All Rights Reserved.


News Article | February 15, 2017
Site: www.prlog.org

The Hong Kong Polytechnic University (PolyU) welcomes the audit findings of the Quality Assurance Council (QAC) Panel under the University Grants Committee. -- The Hong Kong Polytechnic University (PolyU) welcomes the audit findings of the Quality Assurance Council (QAC) Panel under the University Grants Committee and is delighted to learn that the Panel found good practices worthy of commendations in all the audit areas and the two audit themes – Enhancing the student learning experience and Global engagements:strategies and current developments. The Panel concluded that PolyU has an effective framework in place for Quality Enhancement (QE) that is systematically monitored, internally reviewed and externally benchmarked.PolyU President Professor Timothy W. Tong said "PolyU puts students at the centre and strives to provide a value-added education. We are encouraged that the Panel appreciates the achievements of our graduates, based on the comments from employers and alumni, as well as employment statistics."To tie in with the new academic structure launched in 2012, PolyU has redesigned the undergraduate curriculum, with a view to sending forth graduates who are capable of having success in their chosen profession while ready to serve the global society. To enhance the students' learning experience, PolyU makes innovative use of technology in learning and teaching, and provide students with fit-for-purpose learning space. The implementation of outcome-based education is mandatory and fully integrated into PolyU's quality assurance process.The Panel concluded that PolyU's undergraduate curriculum is innovative, focusing on academic relevance, real-world experience, professional practice and international understanding and experience and commended PolyU for making service-learning and work-integrated education mandatory. The Panel also noted the students' high levels of satisfaction with the development of learning spaces and the use of electronic resources.With regards to the University's efforts in global engagement, the Panel commended the University's strategic focus on internationalisation in the strategic plan and the way in which teaching staff, non-academic professional support staff and students have embraced, adopted and implemented the theme within both the core and co-curriculum. The Panel said, the global engagements theme permeates the University's thinking and operations, and PolyU's proactive and creative approach to global engagements is working effectively.Professor Tong welcomes the Panel's endorsement of the University's firm commitment, comprehensive strategies and plans to enhance the student learning experience.  He said, "the University considers this quality audit an opportunity for QE. We will thoroughly consider all suggestions in the spirit of continuous quality enhancement."


News Article | February 17, 2017
Site: www.prweb.com

The Hong Kong Polytechnic University (PolyU) welcomes the audit findings of the Quality Assurance Council (QAC) Panel under the University Grants Committee and is delighted to learn that the Panel found good practices worthy of commendations in all the audit areas and the two audit themes – Enhancing the student learning experience and Global engagements: strategies and current developments. The Panel concluded that PolyU has an effective framework in place for Quality Enhancement (QE) that is systematically monitored, internally reviewed and externally benchmarked. PolyU President Professor Timothy W. Tong said “PolyU puts students at the centre and strives to provide a value-added education. We are encouraged that the Panel appreciates the achievements of our graduates, based on the comments from employers and alumni, as well as employment statistics.” To tie in with the new academic structure launched in 2012, PolyU has redesigned the undergraduate curriculum, with a view to sending forth graduates who are capable of having success in their chosen profession while ready to serve the global society. To enhance the students’ learning experience, PolyU makes innovative use of technology in learning and teaching, and provide students with fit-for-purpose learning space. The implementation of outcome-based education is mandatory and fully integrated into PolyU’s quality assurance process. The Panel concluded that PolyU’s undergraduate curriculum is innovative, focusing on academic relevance, real-world experience, professional practice and international understanding and experience and commended PolyU for making service-learning and work-integrated education mandatory. The Panel also noted the students’ high levels of satisfaction with the development of learning spaces and the use of electronic resources. With regards to the University’s efforts in global engagement, the Panel commended the University’s strategic focus on internationalisation in the strategic plan and the way in which teaching staff, non-academic professional support staff and students have embraced, adopted and implemented the theme within both the core and co-curriculum. The Panel said, the global engagements theme permeates the University’s thinking and operations, and PolyU’s proactive and creative approach to global engagements is working effectively. Professor Tong welcomes the Panel’s endorsement of the University’s firm commitment, comprehensive strategies and plans to enhance the student learning experience. He said, “the University considers this quality audit an opportunity for QE. We will thoroughly consider all suggestions in the spirit of continuous quality enhancement.”


News Article | November 2, 2016
Site: www.prweb.com

Lund University (LU), The Hong Kong Polytechnic University (PolyU), National Food Institute, Technical University of Denmark (DTU) and the University of Bologna (Unibo) jointly announce the addition of DTU and Unibo as new partners in the establishment of a Joint Centre of Excellence in Food Safety (Joint Centre). The four parties will achieve greater synergy in advancing global food safety with this exciting alliance. The Joint Centre was conceived by LU and PolyU in February 2016. In September 2016 representatives of the four universities met to kick-start this exciting platform, which will gather the expertise and resources of the four universities in fostering industry-academic-government collaborations towards safer food. Antimicrobial resistance, food authenticity, and safe food packaging are among the imminent food safety challenges. The collaborating universities will tackle through world-class innovative science and technology that can be translated into applications aimed at enhancing food safety. Exchanges between academics and students as well as expansion of partnerships with other stakeholders are also on the radar. The Joint Centre partners have also agreed to follow up on the success of the first Global Food Safety and Technology Conference, which was held in February 2016. The second conference will be named GoFood, which will be organized by LU and DTU, and co-organized by PolyU and Unibo in late May, 2017. The conference aims to enhance food safety enabled by new scientific advancements and technologies. All collaborating parties share the same vision and commitment in addressing the most imminent global food safety challenges. Setting up the Joint Centre is a key milestone in the Europe-Hong Kong collaboration in food safety. With effective technology development and the provision of various communication and educational channels, the universities will see this international collaboration come to fruition.


News Article | November 2, 2016
Site: www.eurekalert.org

Lund University and The Hong Kong Polytechnic University clinch collaborative agreements with Technical University of Denmark and University of Bologna on mission to advance global food safety Lund University and The Hong Kong Polytechnic University clinch collaborative agreements with Technical University of Denmark and University of Bologna on mission to advance global food safety Lund University (LU), The Hong Kong Polytechnic University (PolyU), National Food Institute, Technical University of Denmark (DTU) and the University of Bologna (Unibo) jointly announce the addition of DTU and Unibo as new partners in the establishment of a Joint Centre of Excellence in Food Safety (Joint Centre). The four parties will achieve greater synergy in advancing global food safety with this exciting alliance. The Joint Centre was conceived by LU and PolyU in February 2016. In September 2016 representatives of the four universities met to kick-start this exciting platform, which will gather the expertise and resources of the four universities in fostering industry-academic-government collaborations towards safer food. Antimicrobial resistance, food authenticity, and safe food packaging are among the imminent food safety challenges. The collaborating universities will tackle through world-class innovative science and technology that can be translated into applications aimed at enhancing food safety. Exchanges between academics and students as well as expansion of partnerships with other stakeholders are also on the radar. The Joint Centre partners have also agreed to follow up on the success of the first Global Food Safety and Technology Conference, which was held in February 2016. The second conference will be named GoFood, which will be organized by LU and DTU, and co-organized by PolyU and Unibo in late May, 2017. The conference aims to enhance food safety enabled by new scientific advancements and technologies. All collaborating parties share the same vision and commitment in addressing the most imminent global food safety challenges. Setting up the Joint Centre is a key milestone in the Europe-Hong Kong collaboration in food safety. With effective technology development and the provision of various communication and educational channels, the universities will see this international collaboration come to fruition.


Yang M.,ETH Zurich | Van L.,ETH Zurich | Zhang L.,Hong Kong Polytechnic University
Proceedings of the IEEE International Conference on Computer Vision | Year: 2013

Face recognition (FR) with a single training sample per person (STSPP) is a very challenging problem due to the lack of information to predict the variations in the query sample. Sparse representation based classification has shown interesting results in robust FR, however, its performance will deteriorate much for FR with STSPP. To address this issue, in this paper we learn a sparse variation dictionary from a generic training set to improve the query sample representation by STSPP. Instead of learning from the generic training set independently w.r.t. the gallery set, the proposed sparse variation dictionary learning (SVDL) method is adaptive to the gallery set by jointly learning a projection to connect the generic training set with the gallery set. The learnt sparse variation dictionary can be easily integrated into the framework of sparse representation based classification so that various variations in face images, including illumination, expression, occlusion, pose, etc., can be better handled. Experiments on the large-scale CMU Multi-PIE, FRGC and LFW databases demonstrate the promising performance of SVDL on FR with STSPP. © 2013 IEEE.


Zheng J.-J.,Zhejiang University of Technology | Dai J.-G.,Hong Kong Polytechnic University
Engineering Structures | Year: 2014

Fiber-reinforced polymer (FRP) rods have been increasingly used in grouted ground anchors due to their high strength-to-weight ratio, excellent corrosion resistance, and convenience in incorporating the fiber sensing technology. To establish their pull-out capacity, FRP rods are usually embedded within a grouted steel tube and then subjected to pull-out in the laboratory. The aim of this paper is to develop a numerical method for predicting the nonlinear pull-out response of FRP rods embedded in steel tubes filled with cement grout. In the method, the cement grout is assumed to be subject to simple shear, the local interfacial bond stress-slip model of the bar-to-grout interface is represented by a piece-wise curve comprising elastic, softening, and frictional stages, and the unloading effect is also taken into account. A set of two second-order ordinary differential equations are derived in terms of the displacements of the FRP rod and steel tube and solved analytically to formulate the element transfer matrix. When the thickness of the steel tube approaches infinity, this method can be applied to the problem of FRP rods embedded in rock. Based on the developed numerical method, the interfacial bond properties and snapback phenomenon are analyzed. After the method is validated by comparisons with four sets of experimental data, the effects of the radius and length of FRP rods, the local peak bond stress and the residual frictional strength on the maximum pull-out load are evaluated in a quantitative manner. © 2014 Elsevier Ltd.


Shi W.,Hong Kong Polytechnic University | Miao Z.,Hong Kong Polytechnic University | Debayle J.,Ecole Nationale Superieure des Mines de Saint - Etienne CMP
IEEE Transactions on Geoscience and Remote Sensing | Year: 2014

Road information has a fundamental role in modern society. Road extraction from optical satellite images is an economic and efficient way to obtain and update a transportation database. This paper presents an integrated method to extract urban main-road centerlines from satellite optical images. The proposed method has four main steps. First, general adaptive neighborhood is introduced to implement spectral-spatial classification to segment the images into two categories: road and nonroad groups. Second, road groups and homogeneous property, measured by local Geary's C, are fused to improve road-group accuracy. Third, road shape features are used to extract reliable road segments. Finally, local linear kernel smoothing regression is performed to extract smooth road centerlines. Road networks are then generated using tensor voting. The proposed method is tested and subsequently validated using a large set of multispectral high-resolution images. A comparison with several existing methods shows that the proposed method is more suitable for urban main-road centerline extraction. © 1980-2012 IEEE.


Li R.,Hong Kong Polytechnic University | Leung G.C.,University of Manchester | Leung G.C.,Hong Kong Baptist University
Energy Policy | Year: 2012

The aim of this paper is to re-examine the relationship between coal consumption and real GDP of China with the use of panel data. This paper applies modern panel data techniques to help shed light on the importance of the heterogeneity among different regions within China. Empirical analyses are conducted for the full panel as well as three subgroups of the panel. The empirical results show that coal consumption and GDP are both I(1) and cointegrated in all regional groupings. Heterogeneity is found in the GDP equation of the full panel. The regional causality tests reveal that the coal consumption-GDP relationship is bidirectional in the Coastal and Central regions whereas causality is unidirectional from GDP to coal consumption in the Western region. Thus, energy conservation measures will not adversely affect the economic growth of the Western region but such measures will likely encumber the economy of the Coastal and Central regions, where most of the coal intensive industries are concentrated. © 2011 Elsevier Ltd.


Zheng J.-J.,Zhejiang University of Technology | Dai J.-G.,Hong Kong Polytechnic University
Construction and Building Materials | Year: 2014

This paper attempts to predict the nonlinear pull-out response of fiber reinforced polymer (FRP) rods embedded in steel tubes filled with cement grout. Based on a tri-linear bond-slip model, the whole FRP rod is divided into three zones: linear elastic, softening, and frictional. In each zone, a set of two second-order ordinary differential equations are established in terms of the displacements of the FRP rod and steel tube and solved in an analytical manner. When the thickness of the steel tube approaches infinity, the solution can be applied to the problem of FRP rods embedded in rock. Based on the derived solution, the interfacial bond properties and snapback phenomenon are discussed. After the analytical solution is validated by comparisons with four sets of experimental data, the effects of the radius and length of FRP rods, the local peak bond stress and the residual frictional strength on the maximum pull-out load are evaluated through sensitivity analysis. © 2014 Elsevier Ltd. All rights reserved.


Hsieh J.J.P.-A.,Hong Kong Polytechnic University | Rai A.,Georgia State University | Keil M.,Georgia State University
Information Systems Research | Year: 2011

Digital inequality, or unequal access to and use of information and communication technologies (ICT), is a severe problem preventing the socioeconomically disadvantaged (SED) from participating in a digital society. To understand the critical resources that contribute to digital inequality and inform public policy for stimulating initial and continued ICT usage by the SED, we drew on capital theories and conducted a field study to investigate: (1) the forms of capital for using ICT and how they differ across potential adopters who are SED and socioeconomically advantaged (SEA); (2) how these forms of capitals are relatively impacted for the SEA and the SED through public policy for ICT access; and (3) how each form of capital influences the SED's intentions to use initially and to continue to use ICT. The context for our study involved a city in the southeastern United States that offered its citizens free ICT access for Internet connectivity. Our results show that SED potential adopters exhibited lower cultural capital but higher social capital relative to the SEA. Moreover, the SED who participated in the city's initiative realized greater positive gains in cultural capital, social capital, and habitus than the SEA. In addition, we find that the SED's initial intention to use ICT was influenced by intrinsic motivation for habitus, self-efficacy for cultural capital, and important referents' expectations and support from acquaintances for social capital. Cultural capital and social cultural capital also complemented each other in driving the SED's initial use intention. The SED's continued use intention was affected by both intrinsic and extrinsic motivations for habitus and both knowledge and self-efficacy for cultural capital but was not affected by social capital. We also make several recommendations for future research on digital inequality and ICT acceptance to extend and apply the proposed capital framework. © 2011 INFORMS.


Kou S.-C.,Hong Kong Polytechnic University | Poon C.-S.,Hong Kong Polytechnic University | Agrela F.,University of Cordoba, Spain
Cement and Concrete Composites | Year: 2011

This paper presents the results of a laboratory study on the performance of natural and recycled aggregate concrete prepared with the incorporation of different mineral admixtures including silica fumes (SF), metakaolin (MK), fly ash (FA) and Ground granulated blast slag (GGBS). The compressive and splitting tensile strength, drying shrinkage, chloride ion penetration and ultrasonic pulse velocity (UPV) of the concrete mixtures were determined. The test results, in general, showed that the incorporation of mineral admixtures improved the properties of the recycled aggregate concretes. SF and MK contributed to both the short and long-term properties of the concrete, whereas FA and GGBS showed their beneficial effect only after a relatively long curing time. As far as the compressive strength is concerned, the replacement of cement by 10% of SF or 15% of MK improved both mechanical and durability performance, while the replacement of cement by 35% FA or 55% GGBS decreased the compressive strength, but improved the durability properties of the recycled aggregate concretes. Moreover, the results show that the contributions of the mineral admixtures to performance improvement of the recycled aggregate concrete are higher than that to the natural aggregate concrete. © 2011 Elsevier Ltd. All rights reserved.


Zhang S.J.,Nanchang University | To S.,Hong Kong Polytechnic University
International Journal of Machine Tools and Manufacture | Year: 2013

In ultra-precision diamond turning (UPDT), tool's high frequency vibration is natural mechanism influencing nanometric surface roughness of machined components. Its first mode high frequency vibration has been overemphasized. However, its multimode high frequency vibration (MHFTV) has not been reported. In the paper, the MHFTV and its effects on surface generation in UPDT are firstly studied. The experimental and theoretical results verify that (i) diamond tool naturally possesses multimode high frequencies, i.e. one sub-high frequency (SHF) for the tool shank tip, one high frequency (HF) for the tool tip, and one ultrahigh frequency (UHF) for the diamond tip; (ii) dampers cause the variation of tool's multimode high frequencies, under which the MHFTV together produces non-uniform zebra-stripe-like patterns at a machined surface; and (iii) cutting force has a linear relationship with and tool's stiffness has a reverse proportion to the amplitude of the MHFTV to influence surface generation, which can be used to improve surface quality. © 2013 Elsevier Ltd.


News Article | November 28, 2016
Site: www.prnewswire.co.uk

The Hong Kong Polytechnic University (PolyU) kicked off a series of celebration activities for its 80th anniversary on 25 November 2016. To mark the beginning of the year-long celebration, PolyU held in the morning the "International Forum: Nurturing Talent and Building Capacity in Supporting the Belt and Road Development" (the Forum) and in the evening "PolyU 80th Anniversary Launch Ceremony A Prelude to the Celebrations", gathering Senior management of about 10 universities from the mainland, Egypt, Italy, Kazakhstan, Korea, Pakistan, Russia, Turkey and United Kingdom, as well as leaders in the local business sector. Guest of Honour at the Forum, Mr Eddie Ng Hak-kim, Secretary for Education of the Hong Kong SAR Government, commended PolyU for its efforts in the Belt and Road (B&R) Initiative, "I am pleased to note that PolyU has provided a very comprehensive answer by demonstrating what it has done to foster people-to-people bond under the B&R Initiatives. By launching a number of student programmes, PolyU has strived to enhance students' understanding on the latest developments of the B&R countries. All these would undoubtedly help build up a large pool of human capital with the skills, knowledge and global vision necessary to support the important B&R Initiative." At the Launch Ceremony, Mrs Carrie Lam Cheng Yuet-ngor, Chief Secretary for Administration, HKSAR Government, said that the development of PolyU over the decades is a remarkable story of academic growth and success. PolyU's rising international recognition and standing not only testify to PolyU's regional and international impact, but also exemplify the rapid advancement of higher education in Hong Kong. Chairman of the University Grants Council (UGC), Mr Carlson Tong, commended PolyU for its contribution to the development of Hong Kong and said, "Adhered to UGC-defined role statement, PolyU emphasises on application-oriented teaching, professional education and applied research and maintains strong links with various sectors, employers and the community." Professor Timothy W. Tong, President of PolyU, said, "PolyU has grown together with Hong Kong over the past eight decades in a fast-changing global landscape and answered to the call of the times appropriately. We not only embark on research to advance the frontiers of knowledge, but also create solutions to problems and change the world for the better." An anniversary theme song "Shape the Future", written and composed by PolyU's alumni, was presented on stage by C AllStar, a pop music group. The Launch Ceremony was followed by cultural performances by PolyU Choir and Orchestra, university students from the Mainland, Italy, Kazakhstan and Russia. That day also saw the opening of PolyU's Alumni Atrium, which is a new facility of an area of 250 square metres dedicated to the alumni community. It provides a spacious and comfortable environment for leisure, recreation and cultural activities through which alumni can cultivate friendships and foster exchange and partnerships with other members of the PolyU community.


News Article | October 28, 2016
Site: www.prweb.com

The Hong Kong Polytechnic University (PolyU)’s proprietary optical fibre sensing technology in monitoring railway has been adopted overseas, for the first time, in metro lines in Singapore. Apart from installing an optical fibre sensing network in tracks to monitor the trains, sensors are also installed in in-service trains to monitor the tracks on which the trains run. PolyU is the first in the world using fibre optic sensors in in-service trains for continuous monitoring of the tracks. Compared with the prevailing means of regular check-ups for tracks after close of traffic, the new system provides continuous, in-service monitoring of tracks. This enhances service reliability through quick identification and rectification of defects. This new maintenance practice is expected to become a trend in the railway industry globally as it can best meet the ever-rising expectations for service reliability. The use of optical fibre sensing network installed on tracks for monitoring trains, and in the trains for monitoring tracks, is also a most efficient mode of maintenance for two of the most mission-critical components for a railway. This innovative approach won the Third 2014 Berthold Leibinger Innovation Prize in Germany. Through collaboration with various railways on the application of fibre optic sensors, PolyU has become a pioneer and leader in the smart railway condition monitoring technology. A total of 6 groups of sensors will be installed in tracks and trains of the East West Line and North South Line of SMRT which are the two busiest lines in the metro network of Singapore. Professor Tam Hwa-Yaw, Chair Professor of Photonics and Head of Department of Electrical Engineering, PolyU, said, “PolyU is proud to have exported its optical fibre sensing network to provide unprecedented health monitoring for mission-critical components in metro lines overseas. This PolyU technology will help enhance the performance of metro systems through an advanced predictive monitoring and maintenance regime, which is now the best practice in the railway industry and a global trend. This also shows how an academic institution in Hong Kong can develop leading technology in the world through collaboration with the industry.” Dr Tan Chee Keong, Deputy Director of SMRT, Singapore, commented, “SMRT is most delighted to have PolyU’s advanced railway technology installed in our metro lines. With much foresight, SMRT is the first in the world to have adopted this preventive monitoring system, enabled by the cutting-edge railway technologies pioneered by PolyU. I am sure this optical fibre sensing network installed in both the tracks and running trains will enhance the operation of our metro lines.” An agreement was signed with SMRT in February 2016, and a trial run was completed successfully in June. The permanent monitoring system is now being installed in the two lines, to be completed in early 2017. PolyU will provide training to SMRT staff in operating the system, while the data collected during monitoring can also be sent to PolyU real-time for analysis when needed. In addition, PolyU will also provide maintenance and technical support to SMRT for a period of five years after the commissioning of the system.


News Article | March 1, 2017
Site: www.prweb.com

The Hong Kong Polytechnic University (PolyU) and China Aerospace International Holdings Ltd. (CASIL), a public-listed subsidiary of China Aerospace Science and Technology Corporation (CASC), reached a strategic collaborative research framework agreement to advance aerospace engineering. The collaboration aims to establish a mutually beneficial platform to address the extensive technical needs of the aerospace engineering of China leveraging PolyU's strengths in innovations and technology. By forging closer ties between PolyU's research and China aerospace engineering, focusing on robotics, intelligent systems and sustainable energy, the collaboration is expected to result in high-impact and high-value aerospace engineering applications, as well as marketable aerospace products. A joint laboratory on intelligent systems will be established to pioneer research in robotic design and control, energy-saving and cost-efficient vibration control, intelligent systems or structures for control, measurement, sensing and health monitoring etc. in the aerospace field. The collaborative research framework agreement also encompasses professional exchange, visiting program, taught courses, distinguished lectures, funding support and all kinds of collaborative research both in Chinese Mainland and Hong Kong. Ir. Professor Alex Wai, Vice President (Research Development) of PolyU, said, "The collaborative research framework agreement is established to combine PolyU's strength in applied technological innovation and CASC's leadership in the aerospace industry for developing high-impact industrial applications and services." Dr. Xingjian Jing, Associate Professor of the Department of Mechanical Engineering, PolyU, who leads the R&D of robotic systems and vibration control in this strategic scheme, also believes that this collaboration will greatly facilitate and promote the R&D of high-impact robotic and vibration control technologies of PolyU to be applied in national aerospace engineering. About China Aerospace Science and Technology Corporation China Aerospace Science and Technology Corporation (CASC) is a large state-owned enterprise group with its own famous brands such as Shenzhou and Long March and outstanding innovative capabilities and strong core competitiveness. Originated from an institute of the Ministry for National Defense established on October 8, 1956, CASC was formally founded on July 1, 1999 with its headquarters in Beijing. CASC is mainly engaged in the research, design, manufacture and launch of space systems such as launch vehicles, satellites and manned spaceships, and also provides international commercial satellite launch service, which has eight large R&D and production complexes and 12 listed companies including CASIL, which is public-listed in HK, specializing in research, development, manufacture and commercialization of space technologies and products in China. About PolyU The Hong Kong Polytechnic University (PolyU) is a university with a proud and illustrious history. Formerly known as the Hong Kong Polytechnic, the Institution assumed full university status in 1994. The University prides itself on its professional education and innovative research as well as close ties with business and industry. It is the largest publicly-funded tertiary institution in Hong Kong in terms of number of students, with around 30,000 full-time and part-time students, and a vast pool of more than 380,000 graduates.


The Hong Kong Polytechnic University (PolyU) and China Aerospace International Holdings Ltd. (CASIL), a public-listed subsidiary of China Aerospace Science and Technology Corporation (CASC), reached a strategic collaborative research framework agreement to advance aerospace engineering. The collaboration aims to establish a mutually beneficial platform to address the extensive technical needs of the aerospace engineering of China leveraging PolyU's strengths in innovations and technology. By forging closer ties between PolyU's research and China aerospace engineering, focusing on robotics, intelligent systems and sustainable energy, the collaboration is expected to result in high-impact and high-value aerospace engineering applications, as well as marketable aerospace products. A joint laboratory on intelligent systems will be established to pioneer research in robotic design and control, energy-saving and cost-efficient vibration control, intelligent systems or structures for control, measurement, sensing and health monitoring etc. in the aerospace field. The collaborative research framework agreement also encompasses professional exchange, visiting program, taught courses, distinguished lectures, funding support and all kinds of collaborative research both in Chinese Mainland and Hong Kong. Ir. Professor Alex Wai, Vice President (Research Development) of PolyU, said, "The collaborative research framework agreement is established to combine PolyU's strength in applied technological innovation and CASC's leadership in the aerospace industry for developing high-impact industrial applications and services." Dr. Xingjian Jing, Associate Professor of the Department of Mechanical Engineering, PolyU, who leads the R&D of robotic systems and vibration control in this strategic scheme, also believes that this collaboration will greatly facilitate and promote the R&D of high-impact robotic and vibration control technologies of PolyU to be applied in national aerospace engineering. China Aerospace Science and Technology Corporation (CASC) is a large state-owned enterprise group with its own famous brands such as Shenzhou and Long March and outstanding innovative capabilities and strong core competitiveness. Originated from an institute of the Ministry for National Defense established on October 8, 1956, CASC was formally founded on July 1, 1999 with its headquarters in Beijing. CASC is mainly engaged in the research, design, manufacture and launch of space systems such as launch vehicles, satellites and manned spaceships, and also provides international commercial satellite launch service, which has eight large R&D and production complexes and 12 listed companies including CASIL, which is public-listed in HK, specializing in research, development, manufacture and commercialization of space technologies and products in China. The Hong Kong Polytechnic University (PolyU) is a university with a proud and illustrious history. Formerly known as the Hong Kong Polytechnic, the Institution assumed full university status in 1994. The University prides itself on its professional education and innovative research as well as close ties with business and industry. It is the largest publicly-funded tertiary institution in Hong Kong in terms of number of students, with around 30,000 full-time and part-time students, and a vast pool of more than 380,000 graduates.


News Article | April 12, 2016
Site: www.greentechmedia.com

A year after a Massachusetts utility first hit a cap on the reimbursements paid to solar energy producers, Gov. Charlie Baker on Monday signed a law to lift the cap. "This legislation builds upon the continued success of the Commonwealth's solar industry and ensures a viable, sustainable and affordable solar market at a lower cost to ratepayers," Baker said in a statement. Secretary of Energy and Environmental Affairs Matthew Beaton said the new law will allow for more solar development while reducing costs to ratepayers. Los Angeles: Despite Tesla Frenzy, Electric Car Sales Are Far From Robust Despite the buzz surrounding the Model 3 and Tesla's two existing vehicles, the top-selling Model S sedan and the recently introduced Model X sport utility vehicle, electric-car sales remain a drop in the bucket for the U.S. auto industry. Pure electric cars such as those sold by Tesla -- that is, not counting hybrids that use batteries and a conventional internal-combustion engine -- totaled 71,064 last year, according to the Electric Drive Transportation Assn., a trade group in Washington. That amounted to only 0.4% of the record 17.4 million cars sold in the United States in 2015. Throw in the hybrids, and the electric-car industry's sales totaled 498,426 last year, but that still was a mere 2.9% of the market. Bloomberg: Paris Climate Deal Seen Taking Effect Two Years Ahead of Plan The global climate change agreement brokered in Paris in December by 195 nations will come into effect two years earlier than originally planned, the top United Nations climate diplomat predicted. “You heard it here first: I think that we will have a Paris Agreement in effect by 2018,” Christiana Figueres, executive secretary of the U.N. Framework Convention on Climate Change, said during a question-and-answer session after delivering a lecture Monday at Imperial College London. The prediction suggests that countries may initiate efforts to reduce greenhouse gas emissions earlier than expected, and increases the chances of meeting the pact’s ultimate goal of limiting the increase in global temperatures to 2 degrees Celsius (3.6 degrees Fahrenheit) since industrialization began. Researchers at The Hong Kong Polytechnic University claim they have created the most efficient solar cells of their kind in the world. After three years of research, Professor Charles Chee Surya from the university’s Department of Electronic and Information Engineering claimed on Tuesday their hybrid solar cells can convert up to 25.5 percent of solar energy, beating the previous record of 22.8 percent set in Switzerland last September. Researchers estimate the efficiency boost can reduce the cost of generating solar power from HK$3.90 per watt to HK$2.73 per watt. Sanders’s campaign for the Democratic presidential nomination, bolstered by private polling, sees the fight over fracking (hydraulic fracturing of rocky shale to access natural gas) as an issue where former secretary of state Hillary Clinton would struggle to win New York Democrats. In a new ad, released after the Binghamton speech and narrated by actress Susan Sarandon, Sanders builds on his opposition to fracking by calling for a national ban. "Do Washington politicians side with polluters over families?" asks Susan Sarandon in the 30-second spot. "They sure do, because Big Oil pumps millions into their campaigns. Bernie Sanders is the only candidate for president who opposes fracking everywhere."


News Article | March 16, 2016
Site: www.cemag.us

The Hong Kong Polytechnic University research team, led by Dr. Jianhua Hao and Dr. Mo Yang, has developed a novel nano biosensor for rapid detection of flu and other viruses. Upon being illuminated by a portable near-infrared laser pen, one can easily quantify the concentration of the targeted flu virus by measuring the decrease in the green light intensity. The Department of Applied Physics (AP) and Interdisciplinary Division of Biomedical Engineering (BME) of The Hong Kong Polytechnic University (PolyU) have jointly developed a novel nano biosensor for rapid detection of flu and other viruses. PolyU's new invention utilizes an optical method called upconversion luminescence resonance energy transfer (LRET) process for ultrasensitive virus detection. It involves simple operational procedures, significantly reducing its testing duration from around 1 to 3 days, to 2 to 3 hours, making it more than 10 times quicker than traditional clinical methods. Its cost is around $2.50 per sample, which is 80 percent lower than traditional testing methods. The technology can be widely used for the detection of different types of viruses, shedding new light on the development of low-cost, rapid, and ultrasensitive detection of different viruses. Traditional biological methods for flu virus detection include genetic analysis — reverse transcription-polymerase chain reaction (RT-PCR) and enzyme-linked immunosorbent assay (ELISA) used in immunology. However, RT-PCR is expensive and time-consuming while the sensitivity for ELISA is relatively low. Such limitations make them difficult for clinical use as a front-line and on-site diagnostic tool for virus detection, paving the way for PolyU's development of the new upconversion nanoparticle biosensor which utilizes luminescent technique in virus detection. PolyU's researchers have developed a biosensor based on luminescent technique which operates like two matching pieces of magnet with attraction force. It involves the development of upconversion nanoparticles (UCNPs) conjugated with a probe oligo whose DNA base pairs are complementary with that of the gold nanoparticles (AuNPs) flu virus oligo. Given the complementary nature of the DNA base pairs of the UCNPs probe oligo and AuNPs flu virus oligo, they work like two matching pieces of magnet, which would be drawn together due to attraction force. This process is also called oligo hybridization. Upon being illuminated by a portable near-infrared laser pen, the UCNPs emit eye-visible green light while the AuNPs would absorb the green light. One can easily quantify the concentration of the targeted flu virus by measuring the decrease in the green light intensity. Initially, PolyU researchers have utilized upconversion LRET for ultrasensitive virus detection in liquid phase system. The research team has further improved the sensitivity of the luminescent detection method by utilizing a solid phased nanoporous membrane system (NAAO) for virus detection. As NAAO membrane consists of many hollow channels, they allow more space for oligo hybridization to take place, significantly increasing its sensitivity by more than tenfold compared to the liquid phase system, proven by clinical detection using inactivated virus samples. Not only is the design and operation of PolyU's invention simple, it does not require expensive instruments and sophisticated operational skills, with its sensitivity comparable to traditional clinical methods. In comparison to conventional downconversion luminescent technique, it causes low damage to genetic materials and does not induce background fluorescence. In addition, since each virus has a unique genetic sequence, researchers would be able to design a complementary probe once the genetic sequence of the targeted virus is known. In other words, the upconversion LRET technology can be widely used for the detection of different types of viruses simply by modifying the UCNPs capture probe. The related results have been recently published in ACS Nano and Small, two leading journals in nano material research. With the support from the Innovation and Technology Support Program, the research team will continue to enhance the nano biosensor for rapid virus detection, which includes increasing its sensitivity and specificity, and developing a matrix for detection of multiple flu viruses on a single testing platform.


Wong H.,Hong Kong Polytechnic University | Hu B.Q.,Wuhan University
Journal of Hydrology | Year: 2014

The extension evaluation method (EEM) has been developed and applied to evaluate water quality. There are, however, negative values in the correlative degree (water quality grades from EEM) after the calculation. This is not natural as the correlative degree is essentially an index based on grades (rankings) of water quality by different methods, which are positive. To overcome this negativity issue, the interval clustering approach (ICA) was introduced, which is based on the grey clustering approach (GCA) and interval-valued fuzzy sets. However, the computing process and formulas of ICA are rather complex. This paper provides a novel method, i.e., improved extension evaluation method, so as to avoid negative values in the correlative degree. To demonstrate our proposed approach, the improved EEM is applied to evaluate the water quality of three different cross-sections of the Fen River, the second major branch river of the Yellow River in China and the Han Jiang River, one of the major branch rivers of the Yangtse River in China. The results of the improved evaluation method are basically the same as the official water quality. The proposed method possesses also the same merit as the EEM and ICA method, which can be applied to assess water quality when the levels of attributes are defined in terms of intervals in the water quality criteria. Existing methods are mostly applicable to data in the form of single numeric values. © 2013 Elsevier B.V.


Zhang L.,Hong Kong Polytechnic University | Mou X.,Xi'an Jiaotong University
Proceedings - International Conference on Image Processing, ICIP | Year: 2010

Image quality assessment (IQA) aims to provide computational models to measure the image quality in a perceptually consistent manner. In this paper, a novel feature based IQA model, namely Riesz-transform based Feature SIMilarity metric (RFSIM), is proposed based on the fact that the human vision system (HVS) perceives an image mainly according to its low-level features. The 1 st-order and 2nd-order Riesz transform coefficients of the image are taken as image features, while a feature mask is defined as the edge locations of the image. The similarity index between the reference and distorted images is measured by comparing the two feature maps at key locations marked by the feature mask. Extensive experiments on the comprehensive TID2008 database indicate that the proposed RFSIM metric is more consistent with the subjective evaluation than all the other competing methods evaluated. © 2010 IEEE.


Zhou Y.,Hong Kong Polytechnic University | Zhou Y.,State University of New York at Buffalo | Kumar A.,Hong Kong Polytechnic University
IEEE Transactions on Information Forensics and Security | Year: 2011

This paper presents two new approaches to improve the performance of palm-vein-based identification systems presented in the literature. The proposed approach attempts to more effectively accommodate the potential deformations, rotational and translational changes by encoding the orientation preserving features and utilizing a novel region-based matching scheme. We systematically compare the previously proposed palm-vein identification approaches with our proposed ones on two different databases that are acquired with the contactless and touch-based imaging setup. We evaluate the performance improvement in both verification and recognition scenarios and analyze the influence of enrollment size on the performance. In this context, the proposed approaches are also compared for its superiority using single image enrollment on two different databases. The rigorous experimental results presented in this paper, on the databases of 100 and 250 subjects, consistently conforms the superiority of the proposed approach in both the verification and recognition scenario. © 2006 IEEE.


Wan S.,Hong Kong Polytechnic University | Mak M.-W.,Hong Kong Polytechnic University | Kung S.-Y.,Princeton University
BMC Bioinformatics | Year: 2012

Background: Although many computational methods have been developed to predict protein subcellular localization, most of the methods are limited to the prediction of single-location proteins. Multi-location proteins are either not considered or assumed not existing. However, proteins with multiple locations are particularly interesting because they may have special biological functions, which are essential to both basic research and drug discovery.Results: This paper proposes an efficient multi-label predictor, namely mGOASVM, for predicting the subcellular localization of multi-location proteins. Given a protein, the accession numbers of its homologs are obtained via BLAST search. Then, the original accession number and the homologous accession numbers of the protein are used as keys to search against the Gene Ontology (GO) annotation database to obtain a set of GO terms. Given a set of training proteins, a set of T relevant GO terms is obtained by finding all of the GO terms in the GO annotation database that are relevant to the training proteins. These relevant GO terms then form the basis of a T-dimensional Euclidean space on which the GO vectors lie. A support vector machine (SVM) classifier with a new decision scheme is proposed to classify the multi-label GO vectors. The mGOASVM predictor has the following advantages: (1) it uses the frequency of occurrences of GO terms for feature representation; (2) it selects the relevant GO subspace which can substantially speed up the prediction without compromising performance; and (3) it adopts an efficient multi-label SVM classifier which significantly outperforms other predictors. Briefly, on two recently published virus and plant datasets, mGOASVM achieves an actual accuracy of 88.9% and 87.4%, respectively, which are significantly higher than those achieved by the state-of-the-art predictors such as iLoc-Virus (74.8%) and iLoc-Plant (68.1%).Conclusions: mGOASVM can efficiently predict the subcellular locations of multi-label proteins. The mGOASVM predictor is available online at http://bioinfo.eie.polyu.edu.hk/mGoaSvmServer/mGOASVM.html. © 2012 Wan et al.; licensee BioMed Central Ltd.


Wan S.,Hong Kong Polytechnic University | Mak M.-W.,Hong Kong Polytechnic University | Kung S.-Y.,Princeton University
Journal of Theoretical Biology | Year: 2013

Prediction of protein subcellular localization is an important yet challenging problem. Recently, several computational methods based on Gene Ontology (GO) have been proposed to tackle this problem and have demonstrated superiority over methods based on other features. Existing GO-based methods, however, do not fully use the GO information. This paper proposes an efficient GO method called GOASVM that exploits the information from the GO term frequencies and distant homologs to represent a protein in the general form of Chou's pseudo-amino acid composition. The method first selects a subset of relevant GO terms to form a GO vector space. Then for each protein, the method uses the accession number (AC) of the protein or the ACs of its homologs to find the number of occurrences of the selected GO terms in the Gene Ontology annotation (GOA) database as a means to construct GO vectors for support vector machines (SVMs) classification. With the advantages of GO term frequencies and a new strategy to incorporate useful homologous information, GOASVM can achieve a prediction accuracy of 72.2% on a new independent test set comprising novel proteins that were added to Swiss-Prot six years later than the creation date of the training set. GOASVM and Supplementary materials are available online at http://bioinfo.eie.polyu.edu.hk/mGoaSvmServer/GOASVM.html. © 2013 Elsevier Ltd.


Rao Y.F.,Xi'an Jiaotong University | Qu L.,Xi'an Jiaotong University | Yang H.,Xi'an Jiaotong University | Chu W.,Hong Kong Polytechnic University
Journal of Hazardous Materials | Year: 2014

Experimental studies were conducted to investigate the oxidative degradation of carbamazepine (CBZ), one of the most frequently detected pharmaceuticals in various waters, by Fe(II)-activated persulfate process. Results show that the Fe2+/S2O8 2- process is very effective for the elimination of CBZ and characterized by a two-stage kinetics (a rapid initial decay followed by a retardation stage). CBZ degradation reaction was observed to be pH dependent and the optimum pH is 3.0 in the range of 2.00-7.87. The concentration of Fe2+ and S2O8 2- exhibited a noticeable influence on CBZ removal efficiency, where [S2O8 2-] exerted more significant effects than that of [Fe2+]. The optimal molar ratio of CBZ, Fe2+, and S2O8 2- is found to be 1:5:40. The effect of various inorganic anions on CBZ removal was also evaluated under the optimal conditions. The anions NO3 -, SO4 2- and H2PO4 -caused a negative effect on the performance of this process, while Cl- interestingly accelerated CBZ degradation. The higher the Cl- concentration, the faster the CBZ decay rate. The intermediates were identified during CBZ degradation with and without the presence of Cl-. The evolution of intermediates for these two scenarios was compared. The decay pathways of CBZ were proposed accordingly. © 2014 Elsevier B.V.


Sun Y.-Y.,National Cheng Kung University | Pratt S.,Hong Kong Polytechnic University
Journal of Travel Research | Year: 2014

China outbound tourism contributes substantial foreign receipts but also creates carbon and water footprints at destinations. This study is set out to analyze whether this tourist segment is a preferred market from the economic and environmental perspectives. Using Taiwan as an example, the direct carbon emission per dollar and total carbon footprint per Chinese inbound visitor is about 20% more efficient than other markets because of a high consumption pattern, longer length of stay, and closer distance between the two regions. However, one unsatisfactory area is the total water footprint because of their high spending on food-related souvenirs that generates substantial water requirements from the agriculture sector. When forecasting the estimated growth of Chinese visitors in Taiwan to 2016, an additional 0.8% increase in economic output is expected at the expense of a 2.7% increase in CO2 emissions and a 3.0% increase in water use. © The Author(s) 2014.


Peng B.,Southwest Jiaotong University | Peng B.,Hong Kong Polytechnic University | Zhang L.,Hong Kong Polytechnic University | Zhang D.,Hong Kong Polytechnic University
Pattern Recognition | Year: 2013

Image segmentation is a fundamental problem in computer vision. Despite many years of research, general purpose image segmentation is still a very challenging task because segmentation is inherently ill-posed. Among different segmentation schemes, graph theoretical ones have several good features in practical applications. It explicitly organizes the image elements into mathematically sound structures, and makes the formulation of the problem more flexible and the computation more efficient. In this paper, we conduct a systematic survey of graph theoretical methods for image segmentation, where the problem is modeled in terms of partitioning a graph into several sub-graphs such that each of them represents a meaningful object of interest in the image. These methods are categorized into five classes under a uniform notation: the minimal spanning tree based methods, graph cut based methods with cost functions, graph cut based methods on Markov random field models, the shortest path based methods and the other methods that do not belong to any of these classes. We present motivations and detailed technical descriptions for each category of methods. The quantitative evaluation is carried by using five indices - Probabilistic Rand (PR) index, Normalized Probabilistic Rand (NPR) index, Variation of Information (VI), Global Consistency Error (GCE) and Boundary Displacement Error (BDE) - on some representative automatic and interactive segmentation methods. © 2012 Elsevier Ltd.


Ni Y.-H.,Tianjin Polytechnic University | Li X.,Hong Kong Polytechnic University
Systems and Control Letters | Year: 2013

In this paper, the consensus problems of the continuous-time integrator systems under noisy measurements are considered. The measurement noises, which appear when agents measure their neighbors' states, are modeled to be multiplicative. By multiplication of the noises, here, the noise intensities are proportional to the absolute value of the relative states of an agent and its neighbor. By using known distributed protocols for integrator agent systems, the closed-loop system is described in the vector form by a singular stochastic differential equation. For the fixed and switching network topology cases, constant consensus gains are properly selected, such that mean square consensus and strong consensus can be achieved. Especially, exponential mean square convergence of agents' states to the common value is derived for the fixed topology case. In addition, asymptotic unbiased mean square average consensus and asymptotic unbiased strong average consensus are also studied. Simulations shed light on the effectiveness of the proposed theoretical results. © 2013 Elsevier B.V. All rights reserved.


Xue W.,Xi'an Jiaotong University | Zhang L.,Hong Kong Polytechnic University | Mou X.,Xi'an Jiaotong University
Proceedings of the IEEE Computer Society Conference on Computer Vision and Pattern Recognition | Year: 2013

General purpose blind image quality assessment (BIQA) has been recently attracting significant attention in the fields of image processing, vision and machine learning. State-of-the-art BIQA methods usually learn to evaluate the image quality by regression from human subjective scores of the training samples. However, these methods need a large number of human scored images for training, and lack an explicit explanation of how the image quality is affected by image local features. An interesting question is then: can we learn for effective BIQA without using human scored images? This paper makes a good effort to answer this question. We partition the distorted images into overlapped patches, and use a percentile pooling strategy to estimate the local quality of each patch. Then a quality-aware clustering (QAC) method is proposed to learn a set of centroids on each quality level. These centroids are then used as a codebook to infer the quality of each patch in a given image, and subsequently a perceptual quality score of the whole image can be obtained. The proposed QAC based BIQA method is simple yet effective. It not only has comparable accuracy to those methods using human scored images in learning, but also has merits such as high linearity to human perception of image quality, real-time implementation and availability of image local quality map. © 2013 IEEE.


Wong H.,Hong Kong Polytechnic University | Hu B.Q.,Wuhan University
Journal of Hydrology | Year: 2013

The extension evaluation method (EEM) has been applied to evaluate water quality. However, in real-life applications, sample data may be given as intervals because of errors produced in measurement, poor data brought by poor information, and imprecise data induced by human errors. To deal with data set in the form of a number of intervals, the interval extension evaluation method (IEEM) has been previously introduced. However, the correlative degrees that are obtained from IEEM may yield negative numbers. In evaluating water quality one generally assigns ranks or grades that are non-negative. Then it is expected that correlative degrees must be non-negative. This paper provides a novel method, i.e., the interval clustering approach (ICA), which is based on the grey clustering approach (GCA) and interval-valued fuzzy sets, to overcome this negativity issue. The method also introduces the notion of weightings in the form of intervals, by which interval samples can be analyzed with a view to delineating the important attributes via the interval weights. To demonstrate our proposed approach, the ICA is applied to evaluate the water quality of three different cross-sections of the Fen River, the second major branch river of the Yellow River in China. Our proposed method is a useful tool for the analysis of poorly measured data, poorly collected data and imprecise hydrological data which are very commonly encountered in water research. In brief, our method is novel for analyzing interval data. The GCA is a special case of the ICA, as these intervals are degenerated single values. © 2013 Elsevier B.V.


Yang L.,Xi'an Jiaotong University | Xu Z.,Hong Kong Polytechnic University | Ostergaard J.,Technical University of Denmark | Dong Z.Y.,University of Newcastle | Wong K.P.,University of Western Australia
IEEE Transactions on Power Systems | Year: 2012

This paper presents an advanced control strategy for the rotor and grid side converters of the doubly fed induction generator (DFIG) based wind turbine (WT) to enhance the low-voltage ride-through (LVRT) capability according to the grid connection requirement. Within the new control strategy, the rotor side controller can convert the imbalanced power into the kinetic energy of the WT by increasing its rotor speed, when a low voltage due to a grid fault occurs at, e.g., the point of common coupling (PCC). The proposed grid side control scheme introduces a compensation term reflecting the instantaneous DC-link current of the rotor side converter in order to smooth the DC-link voltage fluctuations during the grid fault. A major difference from other methods is that the proposed control strategy can absorb the additional kinetic energy during the fault conditions, and significantly reduce the oscillations in the stator and rotor currents and the DC bus voltage. The effectiveness of the proposed control strategy has been demonstrated through various simulation cases. Compared with conventional crowbar protection, the proposed control method can not only improve the LVRT capability of the DFIG WT, but also help maintaining continuous active and reactive power control of the DFIG during the grid faults. © 2012 IEEE.


Hu B.Q.,Wuhan University | Kwong C.K.,Hong Kong Polytechnic University
Information Sciences | Year: 2014

In this paper, we discuss t-norm extension operations of general binary operation for fuzzy true values on a linearly ordered set, with a unit interval and a real number set as special cases. On the basis of it, t-norm operations of type-2 fuzzy sets and properties of type-2 fuzzy numbers are discussed. © 2013 Elsevier Inc. All rights reserved.


Tai Q.,Hong Kong Polytechnic University | Zhao X.,Wuhan University | Yan F.,Hong Kong Polytechnic University
Journal of Materials Chemistry | Year: 2010

Electrospinning, a low cost production method for large area nanofibrous films, is employed to fabricate organic-inorganic hybrid solar cells based on poly(3-hexylthiophene) and TiO2 nanofibers. The performance of the hybrid solar cells is optimized by modifying the surface of TiO2 nanofibers with ruthenium dye (N719) and 3-phenylpropionic acid, which results in the average power conversion efficiency of about 1.1% under AM 1.5G simulated illumination (100 mW cm-2). It is found that the co-modification of N719 and 3-phenylpropionic acid on TiO2 can induce more ordered backbone packing of poly(3-hexylthiophene) layer, lower density of trap states on the surface of TiO2 and longer lifetime of carriers in the active layer due to retarded recombination process by the modifier. Therefore the interface modification can dramatically enhance the photovoltaic performance. © 2010 The Royal Society of Chemistry.


Tschida B.R.,University of Minnesota | Largaespada D.A.,University of Minnesota | Keng V.W.,Hong Kong Polytechnic University
Seminars in Cell and Developmental Biology | Year: 2014

The genetic complexity and heterogeneity of cancer has posed a problem in designing rationally targeted therapies effective in a large proportion of human cancer. Genomic characterization of many cancer types has provided a staggering amount of data that needs to be interpreted to further our understanding of this disease. Forward genetic screening in mice using Sleeping Beauty (SB) based insertional mutagenesis is an effective method for candidate cancer gene discovery that can aid in distinguishing driver from passenger mutations in human cancer. This system has been adapted for unbiased screens to identify drivers of multiple cancer types. These screens have already identified hundreds of candidate cancer-promoting mutations. These can be used to develop new mouse models for further study, which may prove useful for therapeutic testing. SB technology may also hold the key for rapid generation of reverse genetic mouse models of cancer, and has already been used to model glioblastoma and liver cancer. © 2014 Elsevier Ltd.


Xue W.,Xi'an Jiaotong University | Xue W.,Hong Kong Polytechnic University | Zhang L.,Hong Kong Polytechnic University | Mou X.,Xi'an Jiaotong University | Bovik A.C.,University of Texas at Austin
IEEE Transactions on Image Processing | Year: 2014

It is an important task to faithfully evaluate the perceptual quality of output images in many applications, such as image compression, image restoration, and multimedia streaming. A good image quality assessment (IQA) model should not only deliver high quality prediction accuracy, but also be computationally efficient. The efficiency of IQA metrics is becoming particularly important due to the increasing proliferation of high-volume visual data in high-speed networks. We present a new effective and efficient IQA model, called gradient magnitude similarity deviation (GMSD). The image gradients are sensitive to image distortions, while different local structures in a distorted image suffer different degrees of degradations. This motivates us to explore the use of global variation of gradient based local quality map for overall image quality prediction. We find that the pixel-wise gradient magnitude similarity (GMS) between the reference and distorted images combined with a novel pooling strategy-the standard deviation of the GMS map-can predict accurately perceptual image quality. The resulting GMSD algorithm is much faster than most state-of-the-art IQA methods, and delivers highly competitive prediction accuracy. © 2013 IEEE.


Zhang L.,Hong Kong Polytechnic University | Mou X.,Xi'an Jiaotong University | Zhang D.,Hong Kong Polytechnic University
IEEE Transactions on Image Processing | Year: 2011

Image quality assessment (IQA) aims to use computational models to measure the image quality consistently with subjective evaluations. The well-known structural similarity index brings IQA from pixel- to structure-based stage. In this paper, a novel feature similarity (FSIM) index for full reference IQA is proposed based on the fact that human visual system (HVS) understands an image mainly according to its low-level features. Specifically, the phase congruency (PC), which is a dimensionless measure of the significance of a local structure, is used as the primary feature in FSIM. Considering that PC is contrast invariant while the contrast information does affect HVS' perception of image quality, the image gradient magnitude (GM) is employed as the secondary feature in FSIM. PC and GM play complementary roles in characterizing the image local quality. After obtaining the local quality map, we use PC again as a weighting function to derive a single quality score. Extensive experiments performed on six benchmark IQA databases demonstrate that FSIM can achieve much higher consistency with the subjective evaluations than state-of-the-art IQA metrics. © 2011 IEEE.


Patent
Hong Kong Polytechnic University and TENCENT TECHNOLOGY SHENZHEN COMPANY Ltd | Date: 2015-04-16

It is described a network attack detection method. A topology analysis on network is conducted to obtain a probing path set containing at least one probing path. A first probing path contained in the probing path set is probed by using a probing pattern to obtain a performance metric of the first probing path. It is determined whether the first probing path is subjected to network attack according to the performance metric and a control performance metric.


Patent
Hong Kong Polytechnic University and TENCENT TECHNOLOGY SHENZHEN COMPANY Ltd | Date: 2015-03-27

It is described an information processing method and device. It is received a request for service data from a client device. In response to the request for service data, it is sent at least two probing packets which contain the service data to the client device on a forward path which is from a server to the client device. It is obtained timing information, which includes: a time stamp corresponding to the service data, a time stamp corresponding to the request for the service data, and time stamps corresponding to at least two backward-path packets sent by the client device on a backward path, the backward path being from the client device to the server. It is determined according to the timing information a one-way path metric.

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