Seoul, South Korea
Seoul, South Korea

Hanyang University is a private research university in South Korea. The main campus is in Seoul, and the second one, the Education Research Industry Cluster at Ansan, or ERICA campus, is located in Ansan. Hanyang derives from the former name of the capital Seoul which was used during the Chosun Dynasty. Its motto and educational philosophy is Love in Truth and Deed.The university established the nation's first engineering institute in 1939 which became the founding facility of Hanyang University. It also established the first school of architecture and civil engineering in Korea.Hanyang University has an alumni network of 230,000 that is not only limited to the field of engineering but also to other fields. In 2009 the university was ranked 4th for the number of alumni serving as CEOs and executives at Korea’s top 100 companies. In the same year the École des Mines de Paris ranked Hanyang University 89th for the number of alumni CEOs in the world’s top 500 companies.The university enrolls over 1,500 foreign students each year and more than 1,700 students study abroad annually. HYU counts the Massachusetts Institute of Technology, University of Cambridge, and Tsinghua University among its 339 sister institutions in 42 countries. Wikipedia.

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Hanyang University | Date: 2015-01-16

The present invention provides a micro robot including: a drilling body which has a drilling tip formed at an end thereof; a spiral coupling body which has a magnet disposed therein, and is spirally coupled to an outer circumference of the drilling body; and a system control unit which allows the drilling body and the spiral coupling body to spirally move simultaneously or allows the spiral coupling body to spirally move around the drilling body by providing rotational magnetic field to the magnet. In addition, the present invention also provides a micro robot system including the micro robot.

The present invention relates to a complex of PPSA or PSPA polymer and a virus, and a pharmaceutical composition including the same. According to the present invention, when a polymer-virus complex formed using PPSA or PSPA polymer is used, transduction efficiency thereof to cells may be enhanced, an excellent therapeutic effect may thus be obtained when used as a pharmaceutical composition, and, therefore, the pharmaceutical agent may be useful as a therapeutic agent.

Hanyang University | Date: 2015-02-05

The present invention relates to: a method by which a small cell having a relatively narrow cell range changes to an active state in an environment in which the small cell is arranged; and a method and a device by which a terminal detects a small cell base station in an inactive state. According to one embodiment of the present invention, provided are a method and a device by which a terminal measures a discovery signal, the method comprising the steps of: receiving a discovery signal from a small cell base station in an inactive state; and measuring the discovery signal on the basis of a reference signal of the discovery signal comprising a primary synchronization signal (PSS), a secondary synchronization signal (SSS) and a cell-specific reference signal (CRS).

In the positive electrode active material according to the inventive concept, A positive active material for lithium secondary battery comprises a particle comprising M1, M2, and Li, wherein the particle comprises a center, a surface, and an intermediate portion between the center and the surface, wherein M1 and M2 are selected from transition metal and are different each other, and wherein concentrations of M1 and M2 have continuous concentration gradients from the center to the intermediate portion.

Hanyang University | Date: 2015-04-07

The present invention relates to a method for in vitro expansion of erythroid cells. The method includes subjecting erythroid cells to 3-dimensional packed cell culture using a porous structure. The use of the composition according to the present invention enables in vitro expansion of erythroid cells in the most efficient manner.

Hyundai Motor Company and Hanyang University | Date: 2016-05-05

A hole detection method of a vehicle and a system performing the same may include positioning an air injection nozzle at a predetermined position of a vehicle body and positioning a sound sensor at a position corresponding to the air injection nozzle, injecting an air jet from the air injection nozzle, detecting a sound wave from the sound sensor, and calculating a characteristic of a water leakage hole formed on the vehicle body by using the sound wave detected from the sound sensor.

Hanyang University | Date: 2015-04-15

A pellicle for EUV lithography is provided. The pellicle for EUV lithography may improve strength of a pellicle film by having a strength reinforcing layer including a first coupling layer and a carbon nanostructure disposed on a first inorganic layer, the first coupling layer here increase coupling strength between the first inorganic layer and the strength reinforcing layer, and a strength reinforcing layer including a carbon nanostructure. Also, a pellicle for EUV lithography according to another embodiment and a method of fabricating the same are provided. The pellicle for EUV lithography includes a plurality of holes and is a porous thin film made of a material with an extinction coefficient less than or equal to 0.02, and a diameter of the holes is less than or equal to 1 m. Accordingly, improved strength is achievable because thickness may be made large with still having high EUV transmission.

The present disclosure is directed to providing: a new cell-penetrating peptide; and a composition for delivering a biologically active substance, a composition for gene therapy, a method for delivering a biologically active substance and a method for gene therapy using the same. The cell-penetrating peptide of the present disclosure can effectively deliver a protein into human cells and tissues, can deliver a protein with higher efficiency in comparison with a TAT peptide that is commercially used as a cell-penetrating peptide, and can also be usefully used in delivering a biologically active substance such as a protein, a genetic material, a chemical compound, etc. which may be used for a therapeutic purpose into cells.

A graphene touch sensor is provided. The graphene touch sensor includes a first substrate, a first pattern disposed on the first substrate and having a first protruding region and a first concave region, a second substrate on the first substrate, a second pattern disposed on the second substrate to face the first pattern and having a second protruding region and a second concave region, and a graphene layer between the first pattern and the second pattern.

Samsung and Hanyang University | Date: 2016-11-14

A stage circuit includes a first driver, a second driver, a first output unit, a second output unit and a controller. The first driver controls voltages of first and second nodes, according to a first power source, a third power source, a start signal or a carry signal of a previous stage input to a first input terminal, and a clock signal supplied to a second input terminal. The second driver controls voltages of third and fourth nodes, according to voltages of the first power source, the third power source, the first input terminal and the first and second nodes. The first output unit outputs a carry signal to a first output terminal, according to voltages of the first power source, the second input terminal and the third and fourth nodes. The second output unit outputs a scan signal to a second output terminal, according to voltages of the second power source, the second input terminal and the third and fourth nodes. The controller is electrically coupled to the first output terminal and the second driver.

SK hynix and Hanyang University | Date: 2015-12-04

An analog to digital converting device includes an analog to digital converting unit suitable for converting an image signal into a digital signal; and a digital arithmetic unit suitable for calculating a difference between a reset voltage and a signal voltage, which correspond to the digital signal.

Hanyang University | Date: 2017-03-15

The present invention provides a micro robot including: a drilling body which has a drilling tip formed at an end thereof; a spiral coupling body which has a magnet disposed therein, and is spirally coupled to an outer circumference of the drilling body; and a system control unit which allows the drilling body and the spiral coupling body to spirally move simultaneously or allows the spiral coupling body to spirally move around the drilling body by providing rotational magnetic field to the magnet. In addition, the present invention also provides a micro robot system including the micro robot.

The present disclosure is directed to providing: a new cell-penetrating peptide; and a composition for delivering a biologically active substance, a composition for gene therapy, a method for delivering a biologically active substance and a method for gene therapy using the same. The cell-penetrating peptide of the present disclosure can effectively deliver a protein into human cells and tissues, can deliver a protein with higher efficiency in comparison with a TAT peptide that is commercially used as a cell-penetrating peptide, and can also be usefully used in delivering a biologically active substance such as a protein, a genetic material, a chemical compound, etc. which may be used for a therapeutic purpose into cells.

ICTK Co. and Hanyang University | Date: 2017-02-15

An interface element connected to a device and a security die-chip are fabricated in a single package. The security die-chip may provide a security authentication function to the interface element that does not have the security authentication function. The security die-chip may include a physically unclonable function (PUF) to provide a private key, and a hardware security module to perform encryption and decryption using the private key.

Okayama University, Momotaro Gene Inc. and Hanyang University | Date: 2017-04-05

An object of the present invention is to provide a conditionally replicating adenovirus having a strong anticancer effect. A conditionally replicating adenovirus to replicate specifically in a cancer cell and express REIC protein or REIC C domain protein, wherein the conditionally replicating adenovirus is obtained by inserting full-length REIC DNA or REIC C domain DNA into a conditionally replicating adenovirus comprising an ITR (inverted terminal repeat) sequence of an adenovirus type 5 genome and insertion of an HRE sequence, an hTERT promoter, a decorin-encoding DNA, and a DNA encoding a peptide comprising an RGD sequence.

ICTK Co. and Hanyang University | Date: 2017-02-15

Disclosed is an authentication apparatus using a public key encryption algorithm. An apparatus according to an embodiment generates a first instant public key through a random number generation process in response to an electronic signature generation request corresponding to a message. Further, the apparatus calculates and uses a first instant private key making a pair with the first instant public key, using the first instant public key.

Hanyang University | Date: 2017-01-18

The present invention relates to a method for screening a risk group of a hematologic disease and a method for analyzing the prognosis of a hematologic disease based on the measurement of the level of gelsolin mRNA in buffy coat of peripheral blood or a bone marrow aspirate. The use of the present invention enables the screening of a risk group of a hematologic disease and the analysis of prognosis of a patient with a hematologic disease in an easy and accurate manner.

Hanyang University | Date: 2017-02-15

The present invention relates to a method for in vitro expansion of erythroid cells. The method includes subjecting erythroid cells to 3-dimensional packed cell culture using a porous structure. The use of the composition according to the present invention enables in vitro expansion of erythroid cells in the most efficient manner.

Provided are a dose calculation method, a dose calculation device, and a computer-readable storage medium. The dose calculation method comprises: generating an intermediate image between a plurality of sequentially acquired diagnostic images; and calculating doses through a simulation using the diagnostic images and the intermediate image.

A quantization device includes: a trellis-structured vector quantizer which quantizes a first error vector between an N-dimensional (here, N is two or more) subvector and a first predictive vector; and an inter-frame predictor which generates a first predictive vector from the quantized N-dimensional subvector, wherein the inter-frame predictor uses a predictive coefficient comprising an NXN matrix and performs an inter-frame prediction using the quantized N-dimensional subvector of a previous stage.

Provided is an apparatus for assessing degradation and estimating strength by using ultrasound, in which the apparatus includes: an ultrasound transmitting unit making an ultrasound signal having a single frequency be incident in an inspected object; an ultrasound receiving unit receiving the ultrasound signal penetrating the inspected object or reflected on the inspected object; a signal processing unit calculating a propagation speed through a time interval of the ultrasound signal received by the ultrasound receiving unit and separates the received ultrasound signal into a fundamental frequency component and a harmonic component to calculate non-linear parameter, and measuring linear and non-linear elastic coefficients by using the propagation speed and the non-linear parameter; and a strength estimating unit obtaining a tensile curve by using the linear and non-linear elastic coefficients and estimating at least one of tensile strength and yield strength by using the tensile curve.

Cheng L.,Shanghai University | Ge X.-H.,Shanghai University | Sin S.-J.,Hanyang University
Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics | Year: 2014

Generically, the black brane solution with planar horizons is thermodynamically stable. We find a counter-example to this statement by demonstrating that an anisotropic black brane is unstable. We present a charged black brane solution dual to a spatially anisotropic finite temperature N=4 super Yang-Mills plasma at finite U(1) chemical potential. This static and regular solution is obtained both numerically and analytically. We uncover rich thermodynamic phase structures for this system by considering the cases when the anisotropy constant "a" takes real and imaginary values, respectively. In the case a2 > 0, the phase structure of this anisotropic black brane is similar to that of Schwarzschild-AdS black hole with S3 horizon topology, yielding a thermodynamical instability at smaller horizon radii. For the condition a2 ≤ 0, the thermodynamics is dominated by the black brane phase for all temperatures. © 2014 The Authors.

Single-walled carbon nanotubes (SWCNTs), multiwalled carbon nanotubes (MWCNTs), and oxidized MWCNTs (O-MWCNTs) were studied for the adsorption of ibuprofen (IBU) and triclosan (TCS) as representative types of pharmaceutical and personal care products (PPCPs) under different chemical solution conditions. A good fitting of sorption isotherms was obtained using a Polanyi-Manes model (PMM). IBU and TCS sorption was stronger for SWCNTs than for MWCNTs due to higher specific surface area. The high oxygen content of O-MWCNT further depressed PPCP sorption. The sorption capacity of PPCPs was found to be pH-dependent, and more adsorption was observed at pHs below their pK a values. Ionic strength was also found to substantially affect TCS adsorption, with higher adsorption capacity observed for TCS at lower ionic strength. In the presence of a reference aquatic fulvic acid (FA), sorption of IBU and TCS was reduced due to the competitive sorption of FA on carbon nanotubes (CNTs). Sorption isotherm results with SWCNTs, MWCNTs and O-MWCNTs confirmed that the surface chemistry of CNTs, the chemical properties of PPCPs, and aqueous solution chemistry (pH, ionic strength, fulvic acid) all play an important role in PPCP adsorption onto CNTs. © 2011 American Chemical Society.

Sin S.-J.,Hanyang University | Zhou Y.,Sogang University
Journal of High Energy Physics | Year: 2011

We study the relations between two different approaches to the holographic Renormalization Group (RG) flow at the dual gravity level: One is the radial evolution of the classical equation of motion and the other is the flow equation given by the holographic Wilsonian RG coming from the cut off independence. Apparently, the two flows look different. We give general proofs that the two flows are actually equivalent. The role of the momentum continuity (MC) is essential. We show that MC together with cutoff independence gives the evolution equation of the boundary values. Equivalence of conductivity flows in two paradigm has been shown as an explicit example. We also get the connecting formula of Green functions and AC conductivity at arbitrary slice in terms of its value at horizon for various geometry backgrounds. © SISSA 2011.

Kim T.W.,Hanyang University | Yang Y.,University of California at Los Angeles | Li F.,Fuzhou University
NPG Asia Materials | Year: 2012

Nonvolatile memory devices based on hybrid inorganic/organic nanocomposites have emerged as excellent candidates for promising applications in next-generation electronic and optoelectronic devices. Among the various types of nonvolatile memory devices, organic bistable devices fabricated utilizing hybrid organic/inorganic nanocomposites have currently been receiving broad attention because of their excellent performance with high-mechanical flexibility, simple fabrication and low cost. The prospect of potential applications of nonvolatile memory devices fabricated utilizing hybrid nanocomposites has led to substantial research and development efforts to form various kinds of nanocomposites by using various methods. Generally, hybrid inorganic/organic nanocomposites are composed of organic layers containing metal nanoparticles, semiconductor quantum dots (QDs), core-shell semiconductor QDs, fullerenes, carbon nanotubes, graphene molecules or graphene oxides (GOs). This review article describes investigations of and developments in nonvolatile memory devices based on hybrid inorganic/organic nanocomposites over the past 5 years. The device structure, fabrication and electrical characteristics of nonvolatile memory devices are discussed, and the switching and carrier transport mechanisms in the hybrid nonvolatile memory devices are reviewed. Furthermore, various flexible memory devices fabricated utilizing hybrid nanocomposites are described and their future prospects are discussed. © 2012 Nature Japan K.K. All rights reserved.

Cha H.-J.,Sogang University | Yim H.,Hanyang University
Tumor Biology | Year: 2013

Genomic instability has been considered to be one of the prominent factors for carcinogenesis and the development of a number of degenerative disorders, predominantly related to the aging. The cellular machineries involved in the maintenance of genomic integrity such as DNA repair and DNA damage responses are extensively characterized by a large number of studies. The failure of proper actions of such cellular machineries may lead to the devastating effects mostly inducing cancer or premature aging, even with no acute exogenous DNA damage stimuli. In this review, we especially focus on the pathophysiological aspects of the defective DNA damage responses in carcinogenesis and premature aging. Clear understanding the causes of carcinogenesis and age-related degenerative diseases will provide novel and efficient approaches for prevention and rational treatment of cancer and premature aging. © 2013 International Society of Oncology and BioMarkers (ISOBM).

Cheng L.,Shanghai University | Ge X.-H.,Shanghai University | Sin S.-J.,Hanyang University
Journal of High Energy Physics | Year: 2014

Abstract: We present a type IIB supergravity solution dual to a spatially anisotropic N=4 super Yang-Mills plasma at finite U(1) chemical potential and finite temperature. The effective five-dimensional gravitational theory is a consistent Einstein-Maxwell-dilaton-Axion truncation of the gauged supergravity. We obtain the solutions both numerically and analytically. We study the phase structure and thermodynamic instabilities of the solution, and find new instabilities independent of the renormalization scheme. © 2014, The Author(s).

Hangarter C.M.,University of California at Riverside | Chartuprayoon N.,University of California at Riverside | Hernandez S.C.,University of California at Riverside | Choa Y.,Hanyang University | Myung N.V.,University of California at Riverside
Nano Today | Year: 2013

Conducting polymers, or conjugated polymers, are a class of polymers containing a sp2 structure that permits delocalized transport of charge carriers. Here these polymers are examined in the context of nanoscale hybridization with carbon nanotubes, graphene, metal nanoparticles or metal oxide nanoparticles, to harness or amplify adsorption, catalytic reaction and transport behavior of additional material systems. The basis for enhancement in these hybrid nanostructures resides in four general structures in which conjugated polymers act as conduits that interface and respond to nanoparticle interactions or conversely play the role of the sensitizing agent to enhance sensitivity, lower detection limit, response time or selectivity of relatively inert substances, ultimately giving rise to high performance sensors. This review is focused on chemiresistive hybrid conducting polymer sensors for detection of gaseous chemicals discussing several recent reports along with strategies for further development of hybrid sensors. © 2013 Elsevier Ltd. All rights reserved.

Korea Water Resources Corporation, Hanyang University and Kyungnam University | Date: 2014-03-31

Provided is a separation membrane for seawater desalination and a method for manufacturing the same, and more particularly, a separation membrane for seawater desalination with excellent water permeability and salt rejection and a method for manufacturing the same. If the separation membrane for seawater desalination and the method for manufacturing the same according to the present disclosure are applied, it is possible to provide a separation membrane for seawater desalination with excellent water permeability and salt rejection. Therefore, it is possible to provide a separation membrane for seawater desalination with improved performance in comparison to an existing separation membrane for seawater desalination. As a result, water resources may be widely utilized.

Top Engineering Co. and Hanyang University | Date: 2012-06-15

Provided is an organic light emitting device including a nano composite layer. The organic light emitting device adopts a nano composite layer including an insulator and light emitting nano-particles within a device, thereby simultaneously insulating a control electrode and changing the color of light emitted from a light emitting layer, thereby improving external quantum efficiency. Further, the amount of electron holes and electrons injected into the light emitting layer may be adjusted through a voltage applied to the control electrode so as to secure a stable current when the device is operated. In addition, when compared to a conventional light emitting device, the surface area of positive and negative electrodes may be reduced so as to reduce reflectance with respect to external light.

Agency: Cordis | Branch: FP7 | Program: CP-FP | Phase: GC.NMP.2012-1 | Award Amount: 3.74M | Year: 2012

This project is aimed to the identification and development of nanostructured electrode and electrolyte materials to promote the practical implementation of the very high energy lithium-sulfur battery. In particular, the project will be directed to the definition and test of a new, lithium metal-free battery configuration based on the use of lithiated silicon as the anode and a nanostructured sulfur-carbon composite as the cathode. It is expected that this battery will offer an energy density at least three times higher than that available from the present lithium battery technology, a comparatively long cycle life, a much lower cost (replacement of cobalt-based with a sulfur-based cathode) and a high safety degree (no use of lithium metal). All the necessary steps for reaching this goal are considered, starting from material synthesis and characterization, exploiting nanotechnology for improving rate capability and fast charging, the fabrication and test of large scale prototypes and to the completion of the cycle by setting the conditions for the recycling process. A team of experts have been selected as partners of the project, including a number of academic laboratories, all with worldwide recognized experience in the lithium battery field, whose task will be that of defining the most appropriate electrode and electrolyte nanostructures. The project will benefit by the support of a laboratory expert in battery modeling to provide the theoretical guidelines for materials optimization. Large research laboratories, having advanced and modern battery producing machineries will be involved in the preparation and test of middle size battery prototypes. Finally, chemical and battery manufacturing industries will assure the necessary materials scaling-up and the fabrication and test of large batteries and particular attention will be devoted to the control of the safety and to definition and practical demonstration of its most appropriate recycling process.

Agency: Cordis | Branch: FP7 | Program: CP-FP | Phase: SST.2008.1.1.3. | Award Amount: 5.10M | Year: 2009

Noise pollution is a major environmental problem within the EU. The social costs of traffic noise have been estimated to 0.4% of total GDP. Road traffic is the dominant source, and also rail traffic noise is significant. At the same time, road and rail traffic are expected to steadily increase, and the source strength is not expected to significantly decrease within the near future. To reduce the outdoor traffic noise to a sufficiently low level for a good acoustic environment is a major challenge of high need. Here, we will focus on noise propagation abatement for the outdoor environment. Following the EU Directive on environmental noise, a series of major action have been taken in noise abatement, but the sustainability has rarely been paid attention. The main idea of our project is to optimize the use of green areas, green surfaces and other natural elements in combination with artificial elements in urban and rural environments for reducing the noise impact of road and rail traffic. The project offers a variety of powerful abatement strategies that will make a cost effective improvement by its combination of approaches concerning: ground and road surface treatments; trees, forests and tall vegetation; greening of buildings and other surfaces; and innovative barriers. The noise impact will be assessed in terms of sound levels (including spectra and time patterns) as well as perceived environment (including annoyance, well-being and other health related aspects). The main objectives of the project are: to show by full scale evaluation that the proposed abatement methods work; to deliver noise prediction methods applicable to the proposed abatements, which can also be used in noise mapping software; to deliver assessment methods for the perceived noise environment; to deliver a good practice guide for the end-users; and to show the cost benefit, including the positive effect on urban air quality and CO2 neutrality, of the resulting noise abatement methods.

News Article | November 23, 2016

A Northwestern University research team has developed a first-of-its-kind soft, flexible microfluidic device that easily adheres to the skin and measures the wearer's sweat to show how his or her body is responding to exercise. A little larger than a quarter and about the same thickness, the simple, low-cost device analyzes key biomarkers to help a person decide quickly if any adjustments, such as drinking more water or replenishing electrolytes, need to be made or if something is medically awry. Designed for one-time use of a few hours, the device, placed directly on the skin of the forearm or back, even detects the presence of a biomarker for cystic fibrosis. In the future, it may be more broadly used for disease diagnosis. "The intimate skin interface created by this wearable, skin-like microfluidic system enables new measurement capabilities not possible with the kinds of absorbent pads and sponges currently used in sweat collection," said John A. Rogers, who led the multi-institution research team that created the 'lab on the skin.' "Sweat is a rich, chemical broth containing a number of important chemical compounds with physiological health information. By expanding our previously developed 'epidermal' electronics platform to include a complex network of microfluidic channels and storage reservoirs, we now can perform biochemical analysis of this important biofluid," he said. Rogers is the Louis Simpson and Kimberly Querrey Professor of Materials Science and Engineering, Biomedical Engineering and Neurological Surgery in the McCormick School of Engineering and Northwestern University Feinberg School of Medicine. Rogers and his longtime collaborator Yonggang Huang are pioneers in developing skin-like stretchable electronics that move naturally with the skin, and this is their first device to monitor physiological health by analyzing biofluids. "We already know how to put electronics on the skin in a natural manner -- here our challenge was dealing with fluid flow and the collection, storage and analysis of sweat in a thin, soft and flexible device," said Huang, who worked on the device's design and optimization. "The sweat analysis platform we developed will allow people to monitor their health on the spot without the need for a blood sampling and with integrated electronics that do not require a battery but still enable wireless connection to a smartphone," he said. Huang is the Walter P. Murphy Professor of Civil and Environmental Engineering and Mechanical Engineering at the McCormick School. In a study of accuracy and durability, the device was tested on two different groups of athletes: one cycling indoors in a fitness center under controlled conditions and the other participating in the El Tour de Tucson, a long-distance bicycle race in arid and complex conditions. The researchers placed the device on the arms and backs of the athletes to capture sweat. Details of the versatile platform for sweat analysis will be published Nov. 23 by the journal Science Translational Medicine. During moderate or vigorous exercise, sweat winds through the tiny microscopic channels of the device and into four different small, circular compartments. In the compartments, reactions with chemical reagents result in visible color changes in ways that quantitatively relate to pH and concentrations of glucose, chloride and lactate. When a smartphone is brought into proximity with the device, the wireless electronics trigger an app that captures a photo of the device and analyzes the image to yield data on the biomarker concentrations. "We chose these four biomarkers because they provide a characteristic profile that's relevant for health status determination," said Rogers, director of Northwestern's Center for Bio-Integrated Electronics. "The device also can determine sweat rate and loss, and it can store samples for subsequent laboratory analysis, if necessary." In the group that cycled indoors, the researchers compared the new device's biomarker readouts to conventional laboratory analysis of the same sweat and found the two sets of results agreed with each other. (Conventional methods include capturing sweat with absorbent patches taped to the skin and analyzing them off-site.) With the long-distance cyclists, the researchers tested the durability of the device in the complex and unpredictable conditions of the desert. They found the devices to be robust: They stayed adhered to the athletes' skin, did not leak and provided the kind of quality information the researchers sought. The multidisciplinary work involved close collaborations with clinical investigators, including Dr. Marvin J. Slepian, at the Sarver Heart Center of the University of Arizona, as well as contributions from dermatology experts from L'Oréal, including Guive Balooch. Slepian and Balooch are co-authors of the study. The title of the Science Translational Medicine paper is "A Soft, Wearable Microfluidic Device for the Capture, Storage, and Colorimetric Sensing of Sweat." In addition to Northwestern, the University of Arizona and L'Oréal, other institutions with authors on the paper are the University of Illinois at Urbana-Champaign; Ajou University, Korea; Hanyang University, Korea; Zhejiang University, China; and MC10, Inc.

Park S.H.,Chonnam National University | Lee C.S.,Hanyang University
Energy Conversion and Management | Year: 2014

From the perspectives of environmental conservation and energy security, dimethyl-ether (DME) is an attractive alternative to conventional diesel fuel for compression ignition (CI) engines. This review article deals with the application characteristics of DME in CI engines, including its fuel properties, spray and atomization characteristics, combustion performance, and exhaust emission characteristics. We also discuss the various technological problems associated with its application in actual engine systems and describe the field test results of developed DME-fueled vehicles. Combustion of DME fuel is associated with low NOx, HC, and CO emissions. In addition, PM emission of DME combustion is very low due to its molecular structure. Moreover, DME has superior atomization and vaporization characteristics than conventional diesel. A high exhaust gas recirculation (EGR) rate can be used in a DME engine to reduce NOx emission without any increase in soot emission, because DME combustion is essentially soot-free. To decrease NOx emission, engine after-treatment devices, such as lean NOx traps (LNTs), urea-selective catalytic reduction, and the combination of EGR and catalyst have been applied. To use DME fuel in automotive vehicles, injector design, fuel feed pump, and the high-pressure injection pump have to be modified, combustion system components, including sealing materials, have to be rigorously designed. To use DME fuel in the diesel vehicles, more research is required to enhance its calorific value and engine durability due to the low lubricity of DME, and methods to reduce NOx emission are also required. © 2014 Elsevier Ltd. All rights reserved.

Jande Y.A.C.,Hanyang University | Jande Y.A.C.,Nelson Mandela African Institution of Science and Technology | Kim W.S.,Hanyang University
Desalination | Year: 2013

Capacitive deionization (CDI) is an emerging technology of desalinating brackish/seawater to attain freshwater. The process involves polarization of the two electrodes electrically using direct current; thus the cations and anions are attracted towards the oppositely charged electrode. So far most of the experiments/models involve the charging of the CDI cell at constant voltage. However, charging at constant voltage leads to having a shorter time in a given CDI cell cycle when the system has reached its lowest effluent concentration. This is undesired phenomena. To overcome this problem desalination process is preferred to be performed at constant current. The dynamic response model to describe the variation of the effluent concentration with time under constant current charging has been derived and validated. Also, the effect of processing parameters such as applied current, flow rate, CDI cell dead volume, and capacitance on the lowest effluent concentration is analyzed. © 2013 Elsevier B.V.

Cheong C.,Institute Of Researches Cliniques Of Montreal Ircm | Choi J.-H.,Hanyang University
Molecules and Cells | Year: 2012

Although macrophages and other immune system cells, especially T cells, have been shown to play diseasepromoting roles in atherosclerosis, less is known about the role of antigen presenting cells. Functional, immune stimulating dendritic cells (DCs) have recently been detected in aortic intima, the site of origin of atherosclerosis. We had compared DCs with macrophages in mice with experimental atherosclerosis, to clearly define cell types by developmental and functional criteria. This review summarizes recent advances in studies of DCs in humans and in mouse models of atherosclerosis, as well as providing a simple strategy to measure regulatory T (Treg) cells in the mouse aorta. © The Korean Society for Molecular and Cellular Biology.

Nurunnabi M.,Korea National University of Transportation | Khatun Z.,Korea National University of Transportation | Huh K.M.,Chungnam National University | Park S.Y.,Korea National University of Transportation | And 3 more authors.
ACS Nano | Year: 2013

Photoluminescent graphene quantum dots (GQDs) have fascinating optical and electronic properties with numerous promising applications in biomedical engineering. In this work, we first studied the in vivo biodistribution and the potential toxicity of carboxylated photoluminescent GQDs. KB, MDA-MB231, A549 cancer cells, and MDCK normal cell line were chosen as in vitro cell culture models to examine the possible adverse effects of the carboxylated photoluminescent GQDs. The carboxylated GQDs are desirable for increased aqueous solubility. All cancer cells efficiently took up the carboxylated GQDs. No acute toxicity or morphological changes were noted in either system at the tested exposure levels. A long-term in vivo study revealed that the GQDs mainly accumulated in liver, spleen, lung, kidney, and tumor sites after intravenous injection. To reveal any potential toxic effect of the GQDs on treated mice, serum biochemical analysis and histological evaluation were performed. The toxicity results from serum biochemistry and complete blood count study revealed that the GQDs do not cause appreciable toxicity to the treated animals. Finally, we observed no obvious organ damage or lesions for the GQDs treated mice after 21 days of administration at 5 mg/kg or 10 mg/kg dosages. With adequate studies of toxicity, both in vitro and in vivo, photoluminescent GQDs may be considered for biological application. © 2013 American Chemical Society.

Kim H.,Hanyang University | Jeong G.,Korea Electronics Technology Institute | Kim Y.-U.,Samsung | Kim J.-H.,Kookmin University | And 2 more authors.
Chemical Society Reviews | Year: 2013

Li-air(O2) and Li-S batteries have gained much attention recently and most relevant research has aimed to improve the electrochemical performance of air(O2) or sulfur cathode materials. However, many technical problems associated with the Li metal anode have yet to be overcome. This review mainly focuses on the electrochemical behaviors and technical issues related to metallic Li anode materials as well as other metallic anode materials such as alkali (Na) and alkaline earth (Mg) metals, including Zn and Al when these metal anodes were employed for various types of secondary batteries. This journal is © The Royal Society of Chemistry.

Basf and Hanyang University | Date: 2013-11-04

The present invention relates to a substrate structure in which organic-inorganic hybrid thin films are laminated and a method for preparing the same and more specifically to a substrate structure in which organic-inorganic hybrid thin films are laminated that can be used for light emitters, display devices and solar cell devices wherein the organic-inorganic hybrid thin film including a stable new functional group, an inorganic precursor and an organic precursor are alternately used to afford stability in air and a method for preparing the same.

Agency: Cordis | Branch: H2020 | Program: RIA | Phase: NMBP-26-2016 | Award Amount: 10.76M | Year: 2016

An increasing number of nanomaterials (NMs) are entering the market in every day products spanning from health care and leisure to electronics, cosmetics and foodstuff. Nanotechnology is a truly enabling technology, with unlimited potential for innovation. However, the novelty in properties and forms of NMs makes the development of a well-founded and robust legislative framework to ensure safe development of nano-enabled products particularly challenging. At the heart of the challenge lies the difficulty in the reliable and reproducible characterisation of NMs given their extreme diversity and dynamic nature, particularly in complex environments, such as within different biological, environmental and technological compartments. Two key steps can resolve this: 1) the development of a holistic framework for reproducible NM characterisation, spanning from initial needs assessment through method selection to data interpretation and storage; and 2) the embedding of this framework in an operational, linked-up ontological regime to allow identification of causal relationships between NMs properties, be they intrinsic, extrinsic or calculated, and biological, (eco)toxicological and health impacts fully embedded in a mechanistic risk assessment framework. ACEnano was conceived in response to the NMBP 26 call with the aim to comprehensively address these two steps. More specifically ACEnano will introduce confidence, adaptability and clarity into NM risk assessment by developing a widely implementable and robust tiered approach to NM physico-chemical characterisation that will simplify and facilitate contextual (hazard or exposure) description and its transcription into a reliable NMs grouping framework. This will be achieved by the creation of a conceptual toolbox that will facilitate decision-making in choice of techniques and SOPs, linked to a characterisation ontology framework for grouping and risk assessment and a supporting data management system.

Agency: Cordis | Branch: FP7 | Program: CP | Phase: ENERGY.2011.8.1-2 | Award Amount: 7.37M | Year: 2012

The overall objective of EFENIS is to facilitate and accelerate a move to low carbon manufacturing processes and site management by deployment and demonstration of innovative energy management systems and enabling efficiency technologies, which extend the scope of energy management outside the boundaries of a single plant to total site and then beyond the total site to district heating/cooling systems. The potential is demonstrated across a selection of the EUs most energy-intensive sectors thereby enabling integration across industries and processes while at the same time ensuring wide-spread deployment post-project. The EFENIS project will significantly advance the state-of-the-art with regards to site optimisation and Energy Management Systems. Currently, no deployed solution with a similar holistic scope exists. The major novelty of the project will be the creation of the foundation required for comprehensive, high-impact industrial deployment of energy systems based on Total Site Integration approach in the target industries and subsequent commercial exploitation. The project is focused on allowing integration of the developed technologies and solutions to both new designs and as retrofits to existing sites to ensure fast, widespread and cost-efficient industrial deployment. Until now, both technical and non-technical barriers have prevented the exploitation of this potential.

Bang J.H.,Hanyang University | Kamat P.V.,University of Notre Dame
ACS Nano | Year: 2011

The development of organic/inorganic hybrid nanocomposite systems that enable efficient solar energy conversion has been important for applications in solar cell research. Nanostructured carbon-based systems, in particular C 60, offer attractive strategies to collect and transport electrons generated in a light harvesting assembly. We have assembled CdSe-C 60 nanocomposites by chemically linking CdSe quantum dots (QDs) with thiol-functionalized C 60. The photoinduced charge separation and collection of electrons in CdSe QD-C 60 nanocomposites have been evaluated using transient absorption spectroscopy and photoelectrochemical measurements. The rate constant for electron transfer between excited CdSe QD and C 60 increased with the decreasing size of the CdSe QD (7.9 × 10 9 s -1 (4.5 nm), 1.7 × 10 10 s -1 (3.2 nm), and 9.0 × 10 10 s -1 (2.6 nm)). Slower hole transfer and faster charge recombination and transport events were found to dominate over the forward electron injection process, thus limiting the deliverance of maximum power in CdSe QD-C 60-based solar cells. The photoinduced charge separation between CdSe QDs and C 60 opens up new design strategies for developing light harvesting assemblies. © 2011 American Chemical Society.

Hyundai Mobis and Hanyang University | Date: 2015-01-21

Provided are a system and method for recognizing a surrounding vehicle. The system for recognizing a surrounding vehicle includes a vehicle information collecting unit configured to collect location information of an own vehicle and location information of a surrounding vehicle, a surrounding vehicle recognizing unit configured to generate a lane based on the location information of the own vehicle and the location information of the surrounding vehicle collected by the vehicle information collecting unit and to recognize a location of the surrounding vehicle based on the generated lane, and a situation notifying unit configured to determine a road situation based on the surrounding vehicle recognized by the surrounding vehicle recognizing unit.

Basf and Hanyang University | Date: 2013-11-04

The present invention relates to an organic-inorganic hybrid thin film and a method for preparing the same and more specifically to an organic-inorganic hybrid thin film including a stable new functional group and a method for preparing the organic-inorganic hybrid thin film that is formed by the molecular layer deposition method alternately using inorganic precursor and organic precursor.

Hanyang University and Basf | Date: 2016-07-06

The present invention relates to a substrate structure in which organic-inorganic hybrid thin films are laminated and a method for preparing the same and more specifically to a substrate structure in which organic-inorganic hybrid thin films are laminated that can be used for light emitters, display devices and solar cell devices wherein the organic-inorganic hybrid thin film including a stable new functional group, an inorganic precursor and an organic precursor are alternately used to afford stability in air and a method for preparing the same.

Hyundai Mobis and Hanyang University | Date: 2014-10-14

Disclosed is an apparatus for assisting driving, including: a stereo camera module mounted in a vehicle, and configured to obtain a first image through a first camera and a second image through a second camera; and a processor configured to stereo-match the first image and the second image to obtain a dense disparity map, estimate a cubic b-spline curved line from the dense disparity map by using a coarse-to-fine method, and perform a road profile for two-dimensionally converting a 3D road, on which the vehicle travels, by using the cubic b-spline curved line.

Hanyang University and Basf | Date: 2016-07-06

The present invention relates to an organic-inorganic hybrid thin film and a method for preparing the same and more specifically to an organic-inorganic hybrid thin film including a stable new functional group and a method for preparing the organic-inorganic hybrid thin film that is formed by the molecular layer deposition method alternately using inorganic precursor and organic precursor.

Maiti U.N.,KAIST | Lee W.J.,KAIST | Lee J.M.,KAIST | Oh Y.,KAIST | And 5 more authors.
Advanced Materials | Year: 2014

Outstanding pristine properties of carbon nanotubes and graphene have limited the scope for real-life applications without precise controllability of the material structures and properties. This invited article to celebrate the 25th anniversary of Advanced Materials reviews the current research status in the chemical modification/doping of carbon nanotubes and graphene and their relevant applications with optimized structures and properties. A broad aspect of specific correlations between chemical modification/doping schemes of the graphitic carbons with their novel tunable material properties is summarized. An overview of the practical benefits from chemical modification/doping, including the controllability of electronic energy level, charge carrier density, surface energy and surface reactivity for diverse advanced applications is presented, namely flexible electronics/optoelectronics, energy conversion/storage, nanocomposites, and environmental remediation, with a particular emphasis on their optimized interfacial structures and properties. Future research direction is also proposed to surpass existing technological bottlenecks and realize idealized graphitic carbon applications. The current research status in the chemical modification/doping of carbon nanotubes and graphene is reviewed and their relevant applications in diverse areas, such as flexible electronics/optoelectronics, energy conversion/storage, nanocomposites and environmental remediation are discussed. An overview of specific correlations between chemical modification/doping of the graphitic carbons with their tunable material properties is presented, which offers research direction to realize idealized graphitic carbon nanostructures in future advanced applications. © 2013 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim.

Kim C.S.,Hanyang University | Choi S.H.,Pohang University of Science and Technology | Bang J.H.,Hanyang University
ACS Applied Materials and Interfaces | Year: 2014

Despite recent significant strides in understanding various processes in quantum dot-sensitized solar cells (QDSSCs), little is known about the intrinsic electrocatalytic properties of copper sulfides that are the most commonly employed electrocatalysts for the counter electrode of QDSSCs. Given that the physical properties of copper sulfides are governed by their stoichiometry, the electrocatalytic activity of copper sulfides toward polysulfide reduction may also be dictated by their compositions. Using a new, simple approach to prepare robust copper sulfide films based on chemical bath deposition (CBD), we were able to delicately control the compositions of copper sulfides, which allowed us to perform a systematic investigation to gain new insight into copper sulfide-based electrocatalysts. The electrocatalytic activity is indeed dependent on the compositions of copper sulfides: Cu-deficient films (CuS and Cu1.12S) are superior to Cu-rich films (Cu1.75S and Cu1.8S) in their electrocatalytic activity. In addition, the stability of the Cu-deficient electrocatalysts is substantially better than that of the Cu-rich counterparts. © 2014 American Chemical Society.

Kim S.-M.,Inje University | Oh J.-E.,Hanyang University
Journal of Sound and Vibration | Year: 2013

This paper employs modal filters for simultaneous and independent control of multiple vibration modes of a flexible structure embedded with a non-collocated pair of sensor and actuator. Each modal filter of second order is designed to be sensitive to the target mode for control while insensitive to the others. Based on the fact that there are only in- and out-of-phase modes in lightly and proportionally damped finite structures, those in-phase modes are controlled in the same way as that for collocated control using negative feedback, while those out-of-phase modes are controlled exactly in the opposite way using positive feedback. These two are equivalent as far as single mode control is concerned and are electrical realizations of a mechanical dynamic vibration absorber. Feedback control experiments were conducted on a cantilever beam embedded with a piezoelectric actuator at the root and an accelerometer at the end tip. The results reveal a number of peculiar advantages of using non-collocated control over collocated control. Non-collocated plants generally exhibit better high-frequency roll-off characteristics because there are weaker mechanical and electrical feedthrough couplings between non-collocated transducers. Furthermore, the high frequency control spillover can be greatly eliminated by appropriately adjusting the gains of modal filters. It is thus often possible to make the performance and robustness of non-collocated control as well as or even better than those using collocated control. © 2012 Elsevier Ltd. All rights reserved.

Lee S.,Hanyang University | Kannan K.,New York State Department of Health | Moon H.-B.,Hanyang University
Science of the Total Environment | Year: 2013

Concentrations of polybrominated diphenyl ethers (PBDEs) were determined in commonly consumed seafood and house dust collected from Korea. Total concentrations of PBDEs in seafood and house dust samples were in the ranges of 0.06 to 6.25. ng/g wet weight and 80 to 16,000. ng/g dry weight, respectively. Predominant congeners in seafood were BDEs 47, 99 and 100 and those in dust samples were BDE 209. Estimated daily intakes (EDIs) of PBDEs through seafood consumption and dust ingestion for adults (> 20 years) and toddlers (< 2 years) were 1.83 and 11.4. ng/kg body weight/day, respectively. In comparison with the EDIs reported for PBDEs by general population in several countries, the contribution of seafood consumption to PBDE intake in Korea was the highest. Seafood consumption and dust ingestion contributed equally to the total PBDE intakes in Korean adults, while dust ingestion was the major contributor to toddlers. This study was the first to assess exposure of humans to PBDEs through two major exposure pathways. © 2012 Elsevier B.V.

Hannam University and Hanyang University | Date: 2011-11-14

Disclosed are a benzobis(thiadiazole)-based alternating copolymer, a method for preparing the same, and an organic electronic device including the same. The present disclosure provides a benzobis(thiadiazole)-based alternating copolymer represented by the chemical formula 1:

Lahiri I.,University of North Texas | Choi W.,University of North Texas | Choi W.,Hanyang University
Critical Reviews in Solid State and Materials Sciences | Year: 2013

Advent of nanotechnology has generated huge interest in application of carbon-based nanomaterials as a possible replacement for conventionally used graphite as anode of Li-ion batteries. Future Li-ion batteries demand high capacity, energy, power, and better safety, while graphite falls short of fulfilling all these necessities. Inspired by high conductivity, flexibility, surface area, and Li-ion insertion ability, a number of nano carbon materials, individually or as a composite, have been studied in detail to identify the best suitable material for next-generation energy storage devices. Many of these nano-C-based structures hold good promise, although issues like density of nanomaterials and scalability are yet to be addressed with confidence. This article aims to summarize the major research directions of nano-C materials in anodic application of Li-ion batteries and proposes possible future research directions in this widely studied field. Copyright © Taylor and Francis Group, LLC.

Rangasamy B.,Hanyang University | Hwang J.Y.,Korea Institute of Science and Technology | Choi W.,University of North Texas
Carbon | Year: 2014

Various approaches to improve the efficiency of Lithium ion batteries (LiB) by using Si have been suggested because Si has the highest known lithium capacity. Although Si is more than ten times higher capacity than existing graphite anodes, Si anodes have limited applications due to its high volume change during cycling. Here we demonstrated graphene/Si-CuO quantum dots (Gr/Si-CuO QD) layered structure as an efficient LiB anode which prevents large volume expansion of Si due to the presence of CuO-Cu3Si. By Electrophoresis Deposition technique, the multi-layer of graphene and Si-CuO QD has been successfully fabricated followed by annealing process to form Cu 3Si interlayer as confirmed by High Resolution Transmission Electron Microscope-Energy Dispersive Spectroscopy, X-ray diffraction and Raman analyses. The annealed Gr/Si-CuO QD exhibit the initial gravimetric specific capacity of 2869 mAh g-1 which is five times higher than that of annealed graphene at 0.5C. After 100 cycles at 1C rate the capacity retains ∼71% and the excellent rate capability even at high C rate reveals controlled volume expansion owing to the multi layered architecture and the Cu3Si inter layer. The layered structure of Gr/Si-CuO QD electrode could be applied in next generation micro power sources. © 2014 Elsevier Ltd. All rights reserved.

Ma Z.,Cornell University | Lee J.-W.,Hanyang University | Helmann J.D.,Cornell University
Nucleic Acids Research | Year: 2011

Bacillus subtilis PerR is a Fur family repressor that senses hydrogen peroxide by metal-catalyzed oxidation. PerR contains a structural Zn(II) ion (Site 1) and a regulatory metal binding site (Site 2) that, upon association with either Mn(II) or Fe(II), allosterically activates DNA binding. In addition, a third less conserved metal binding site (Site 3) is present near the dimer interface in several crystal structures of homologous Fur family proteins. Here, we show that PerR proteins with substitutions of putative Site 3 residues (Y92A, E114A and H128A) are functional as repressors, but are unexpectedly compromised in their ability to sense H2O2. Consistently, these mutants utilize Mn(II) but not Fe(II) as a co-repressor in vivo. Metal titrations failed to identify a third binding site in PerR, and inspection of the PerR structure suggests that these residues instead constitute a hydrogen binding network that modulates the architecture, and consequently the metal selectivity, of Site 2. PerR H128A binds DNA with high affinity, but has a significantly reduced affinity for Fe(II), and to a lesser extent for Mn(II). The ability of PerR H128A to bind Fe(II) in vivo and to thereby respond efficiently to H2O2 was restored in a fur mutant strain with elevated cytosolic iron concentration. © 2011 The Author(s).

Huang L.,Zhejiang GongShang University | Suh I.H.,Hanyang University | Abraham A.,Network Intelligence
Information Sciences | Year: 2011

Dynamic multi-objective optimization is a current hot topic. This paper discusses several issues that has not been reported in the static multi-objective optimization literature such as the loss of non-dominated solutions, the emergence of the false non-dominated solutions and the necessity for an online decision-making mechanism. Then, a dynamic multi-objective optimization algorithm is developed, which is inspired by membrane computing. A novel membrane control strategy is proposed in this article and is applied to the optimal control of a time-varying unstable plant. Experimental results clearly illustrate that the control strategy based on the dynamic multi-objective optimization algorithm is highly effective with a short rise time and a small overshoot. © 2011 Elsevier Inc. All rights reserved.

The present disclosure relates to a positive electrode active material precursor for a lithium secondary battery, a positive electrode active material manufactured by using thereof, and a lithium secondary battery comprising the same. More specifically, it relates to a positive electrode active material precursor for a lithium secondary battery as a secondary particle comprising transition metals, and formed by gathering of a plurality of primary particles having different a-axis direction length to c-axis direction length ratio , wherein the a-axis direction length to c-axis direction length ratio of the primary particle making up the secondary particle is increased from the center to the surface of the secondary particle; a positive electrode active material; and a lithium secondary battery comprising the same.

Positive electrode active materials are provided. The positive electrode active materials includes a primary particle formed of a plurality of metals including a first metal and a secondary particle formed of at least one of the primary particle. The secondary particle includes a core part, a shell part, a seed region where the primary particle having concentration gradient of the first metal is disposed and a maintain region where the primary particle having constant concentration of the first metal is disposed, the seed region adjacent to the core part and a maintain region adjacent to the sell part, and length of the seed region in a direction from the core part to the shell part is 1 m.

Hanyang University and Enerceramic Inc. | Date: 2013-12-26

The present disclosure relates to a cathode active material for a lithium secondary battery, and more particularly, to a cathode active material, which is used for a lithium secondary battery and is prepared to include a mixture of particles with different particle sizes and thereby to have an improved tap density. At least one particle of the mixture of the particles is provided to have a gradient in internal concentration.

The present invention provides a cathode active material on which at least one coating layer is formed, a method for manufacturing the same, and a lithium secondary battery including the same. According to the present invention, since the coating layer with high electrical conductivity is formed on a surface of the cathode active material, the electrical conductivity is improved to enhance charge/discharge and cycle life characteristics and thermal stability of the battery.

The present disclosure relates to a positive electrode active material precursor for a lithium secondary battery, a positive electrode active material manufactured by using thereof, and a lithium secondary battery comprising the same. More specifically, it relates to a positive electrode active material precursor for a lithium secondary battery as a secondary particle comprising transition metals, and formed by gathering of a plurality of primary particles having different a-axis direction length to c-axis direction length ratio, wherein the a-axis direction length to c-axis direction length ratio of the primary particle making up the secondary particle is increased from the center to the surface of the secondary particle; a positive electrode active material; and a lithium secondary battery comprising the same.

Park J.,Hanyang University | Yao T.,Tohoku University
Journal of Alloys and Compounds | Year: 2012

Position controlled single crystalline ZnO nanowires are grown on periodically polarity-inverted (PPI) ZnO heterostructures without catalyst. PPI ZnO templates were fabricated by using selective growth method of polarity with Cr-compound intermediate layers by plasma assisted molecular beam epitaxy. In order to control the position, we used the in-plane two-dimensionally discrete PPI ZnO templates. The lateral polarity inversion in PPI template was confirmed by piezo response microscopy. After syntheses of ZnO nanowires, vertically aligned ZnO nanowires were grown only onto the Zn-polar regions without the O-polar regions. The results clearly show that the position control of ZnO nanowires is possible using the PPI ZnO templates. © 2011 Elsevier B.V. All rights reserved.

Hanyang University and Enerceramic Inc | Date: 2015-11-04

The present disclosure relates to a cathode active material for a lithium secondary battery, and more particularly, to a cathode active material, which is used for a lithium secondary battery and is prepared to include a mixture of particles with different particle sizes and thereby to have an improved tap density. At least one particle of the mixture of the particles is provided to have a gradient in internal concentration.

The present invention provides a cathode active material on which at least one coating layer is formed, a method for manufacturing the same, and a lithium secondary battery including the same. According to the present invention, since the coating layer with high electrical conductivity is formed on a surface of the cathode active material, the electrical conductivity is improved to enhance charge/discharge and cycle life characteristics and thermal stability of the battery.

News Article | October 12, 2016

A Dutch startup called LeydenJar is boldly going where no one else in the energy storage field has apparently gone before. The company, a spinoff from the Energy Research Centre of the Netherlands, has come up with a new version of lithium-ion battery technology that uses 100% silicon instead of graphite. At first glance, that’s a risky proposition, because normally silicon goes through destructive cycles of shrinkage and expansion when used in rechargeable batteries. However, if the new battery can be manufactured at scale with a reasonable lifespan, the payoff is an increase in capacity of up to 50% over conventional graphite-based energy storage. With an all-silicon recipe, the LeydenJar team claims that it has increased the capacity of the anode in its new lithium-ion battery by a factor of 10. They managed to do that without ending up with crumbled bits of battery on the floor by applying a one-machine, plasma-based fabrication method to the anode. The silicon is deposited onto a copper substrate in nanoscale columns, achieving a height of about 10 microns (that’s the thickness required for commercial application, according to LeydenJar). The resulting pattern of filled and empty spaces provides enough room for the silicon to expand safely when the battery is recharged. The team also drew on lessons learned from failed experiments in the solar field. The silicon column approach dates back at least a dozen years, when researchers at the Energy Research Centre were trying to develop the material for use in solar cells. That didn’t work out as planned, but all that effort was not lost since the technology has been transferred to the energy storage field. The new battery’s ties to the solar field also carry over to the manufacturing process. The plasma-based method enables commercial-scale production of what was previously possible only in small batches. As described by LeydenJar, there is a huge difference between their one-machine, one-step process and conventional anode production. Conventional graphite anodes can be enhanced with small amounts of silicon, but that requires “active material, binder, and other components in a capital-intensive process consisting of slurry making, a coating process, a baking process, calendering and slitting.” In contrast, the LeydenJar anode is fabricated with a familiar roll-to-roll process that incorporates modded-out plasma-enhanced chemical vapor depositing equipment. “LeydenJar Technologies’ invention is based on a cross-sectoral innovation, applying the production technology of thin film solar panels (and semiconductors) to anode production in a one step approach. We have made a number of alterations to a plasma enhanced chemical vapor depositioning machine (“PECVD”), through which we can control the morphology and porosity of nanostructured Silicon pillars, directly on the copper foil that is used as the anode current collector in the battery industry.” Currently, the team is working on a model plant that will be able to churn out 100% silicon anode rolls for battery manufacturers on a test basis. The new plant will also provide a platform for R&D, and it will serve to demonstrate the potential for commercial scale production. Commissioning is not expected until 2018. In the meantime, LeydenJar is fine tuning its anode and expects to have an optimized version ready for testing by Germany’s nonprofit energy technology institute ZSW next year. Other researchers have been pursuing the silicon energy storage angle, though it appears that LeydenJar will be first out of the box with a commercial version. Some examples include a silicon anode based on the structure of reed leaves, a composite of silicon and graphine from Korea’s UNIST, silicon “nano-beads” from the University of Maryland, and a pulverized, porous form of silicon from Rice University. Note: back in 2008, our sister site also took a look at an anode enhanced with a porous form of silicon under development by a team based at Jaephil Cho at Hanyang University in Korea. Buy a cool T-shirt or mug in the CleanTechnica store!   Keep up to date with all the hottest cleantech news by subscribing to our (free) cleantech daily newsletter or weekly newsletter, or keep an eye on sector-specific news by getting our (also free) solar energy newsletter, electric vehicle newsletter, or wind energy newsletter.

News Article | February 15, 2017

YONGIN-SI, GYEONGGI-DO, SOUTH KOREA, February 14, 2017-- Yun-Gu Cho has been included in Marquis Who's Who. As in all Marquis Who's Who biographical volumes, individuals profiled are selected on the basis of current reference value. Factors such as position, noteworthy accomplishments, visibility, and prominence in a field are all taken into account during the selection process.Dr. Cho has been a general manager and advanced materials team leader for Hyundai Engineering & Construction Co., Ltd. since 1998. Working within the company's research and development division, he has led and contributed to a number of projects in multiple countries over the years. Since 2016, he has been working on concrete mix design for the Hyundai Global Business Center in South Korea, and since 2015, he has been overseeing concrete mix design and durability for the Chacao Channel Bridge in Chile. Dr. Cho has also been handling concrete mix design and durability for the Sheikh Jaber Al-Ahmad Al-Sabah Causeway Bridge in Kuwait since 2012. From 2013 to 2016, he oversaw concrete mix design and durability for the Yavuz Sultan Selim Bridge in Turkey, and from 2010 to 2013, he handled concrete mix design for a nuclear power plant in United Arab Emirates.Dr. Cho's earlier projects with the company involved low carbon, ultra-low heat concrete for mass concrete structures, ultra-high strength fire-resistant and blast-resistant concrete, low heat ultra-strength concrete, standardization for construction safety and eco-friendly construction material, and more. He brings to each project a high level of industry expertise, strong leadership skills, and an exceptional academic foundation.A graduate of Seoul National University, Dr. Cho earned a Bachelor of Arts in civil engineering in 1994, a Master of Engineering in civil engineering in 1996, and a Ph.D. in civil engineering in 2002. His latter studies focused on civil engineering as it relates to concrete. In 2009, Dr. Cho obtained a second Master of Engineering in construction management from Hanyang University. He has utilized his knowledge as a member of the mass concrete committee of the Korea Concrete Institute since 2010, and as a member of the slag committee of the Korean Recycled Construction Resource Institute.In addition to his work with Hyundai and with professional organizations, Dr. Cho has channeled his experience and knowledge to write and publish numerous works for industry publications. He has published several articles in the Journal of the Korea Concrete Institute, including "Control of Thermal Crack in Mass Concrete Using Automated Curing System," published in 2013, and "Experimental Study on Bond Behavior of Retrofit Materials by Bond-Shear Test," published in 2012. Dr. Cho has also published a number of articles in the Journal of the Korean Society of Civil Engineers.Dr. Cho's efforts have been recognized by multiple awards from the chief executive officer of Hyundai Engineering & Construction Co., Ltd. He also received a Commendation Award from the Korea Institute of Construction Materials in 2010. Dr. Cho aims for continued professional excellence and achievements as he moves forward in his career.About Marquis Who's Who :Since 1899, when A. N. Marquis printed the First Edition of Who's Who in America , Marquis Who's Who has chronicled the lives of the most accomplished individuals and innovators from every significant field of endeavor, including politics, business, medicine, law, education, art, religion and entertainment. Today, Who's Who in America remains an essential biographical source for thousands of researchers, journalists, librarians and executive search firms around the world. Marquis now publishes many Who's Who titles, including Who's Who in America , Who's Who in the World , Who's Who in American Law , Who's Who in Medicine and Healthcare , Who's Who in Science and Engineering , and Who's Who in Asia . Marquis publications may be visited at the official Marquis Who's Who website at

Mohamed R.M.,Central Metallurgical Research and Development Institute | Mohamed R.M.,King Abdulaziz University | McKinney D.L.,MM Virtuoso Inc. | Sigmund W.M.,University of Florida | Sigmund W.M.,Hanyang University
Materials Science and Engineering R: Reports | Year: 2012

Rapid development of nanofabrication techniques has created many different types of advanced nanosized semiconductors. Photocatalytic materials used to degrade organic and inorganic pollutants now include, in addition to TiO 2, ZnO, Fe 2O 3, WO 3, MoS 2, and CdS. Nanoparticles' unique properties, e.g. surface to volume ratio and quantum effects, continue to improve and expand photocatalysis' role in areas like environmental remediation, odor control, sterilization, and renewable energy. Controlling semiconductor size, shape, composition, and microstructure promises to benefit future research and applications in these fields. This review examines recent advances at the interface of nanoscience and photocatalysis, especially pertaining to nanocatalyst enhancements, for current and future environmental applications. © 2011 Elsevier B.V.

Jin X.,Dongguk University | No J.-S.,Seoul National University | Shin D.-J.,Hanyang University
IEEE Transactions on Signal Processing | Year: 2013

Abstract-Transmit antenna selection (TAS) is usually applied to multiple- input multiple-output (MIMO) systems because it does not require additional radio frequency (RF) chains which are quite expensive. In MIMO decode-and-forward (DF) relay networks, both source-destination and source-relay-destination paths should be simultaneously considered to find an effective source TAS (STAS). In this paper, a new STAS is proposed based on both channel state information and transmission scheme for the MIMO DF relay networks. It is also shown that the proposed STAS which selects antennas among transmit antennas at the source can achieve full diversity regardless of the value of . Simulation results show that the proposed STAS has better average bit error probability (BEP) performance than other STASs. Also, the proposed STAS with has lower cost, complexity, overhead, and BEP than the STAS with using full-rate full-diversity space-time block codes with the same total transmit power. © 2012 IEEE.

Park S.,KEPCO E&C | Jeun G.,Hanyang University
Computer Methods in Applied Mechanics and Engineering | Year: 2011

The moving particle semi-implicit (MPS) method does not require grids for simulating fluid motions. Therefore, the MPS method can easily handle a large deformation of fluid. However, the MPS method has some difficulties in simulating transfer of momentum caused by a physical collision between different fluids because fluid particles have no mass or volume and only have weights for interacting with other particles. To overcome this inherent defect of the MPS method, rigid body dynamics is explicitly coupled with the MPS method in this study. In the first step, the MPS calculation is performed with particles which are considered to have no mass or volume. In the second step, rigid body dynamics comes into the calculation and considers the particles to have a slightly lesser diameter than the initial distance between particles. Then, physical contacts between particles are simulated with the dynamic energy conserved while the incompressibility of fluids is effectively maintained. In the single fluid region, the coupled method deals with the behavior of the particles. For the interface of the different fluids, only rigid body dynamics is used to simulate the transfer of the momentum caused by physical collisions of fluids. Through this coupling of rigid body dynamics and the MPS method, the overall stability related with the incompressibility of a fluid is comparatively increased in the single-phase fluid simulation. For the calculation of the multi-phase fluids behavior, fluids interactions can be easily treated with improving stability of the MPS calculation. In this study, collapse of water column and the isothermal fuel-coolant interaction (FCI), in which a water jet is directed into a denser fluid pool, were simulated to validate the coupling method of the MPS method and rigid body dynamics. © 2010 Elsevier B.V.

Jung S.H.,Gyeongsang National University | Jeon J.,Korea Advanced Institute of Science and Technology | Kim H.,Korea Advanced Institute of Science and Technology | Jaworski J.,Hanyang University | And 2 more authors.
Journal of the American Chemical Society | Year: 2014

Chiral materials composed of organized nanoparticle superstructures have promising applications to photonics and sensing. Reliable customization of the chiroptical properties of these materials remains an important goal; hence, we report a customizable scheme making use of modular gelator components for controlling the helicity and formation of nanofibers over long length scales resulting in hydrogel templates. Controlled growth of gold nanoparticles at spatially arranged locations along the nanofiber is achieved by UV reduction of Au(I) ions on the supramolecular templates. The resulting materials were found to have significant interparticle interactions and well-defined helicity to provide high quality, chiroptically active materials. With this novel approach, the tailored assembly of nanoparticle superstructures with predictable chiroptical properties can be realized in high yield, which we expect to allow rapid advancement of chiral nanomaterials research. © 2014 American Chemical Society.

Lee J.H.,Gyeongsang National University | Jaworski J.,Hanyang University | Jung J.H.,Gyeongsang National University
Nanoscale | Year: 2013

Achieving both high specificity and sensitivity are essential for gas phase chemical detection systems. Recent implementation of Metal-Organic Frameworks (MOFs) have shown great success in separation and storage systems for specific gas molecules. By implementing a MOF structure comprised of Zn2+ coordinated trans-stilbene derivatives, a gas responsive material has been created which exhibits a high photoluminescence quantum yield, offering new opportunities for chemical sensors. Here, we reveal a nanocomposite material, assembled from azobenzene functionalized graphene oxide and stilbene-MOF, that is capable of luminescent quenching by explosive gases. This unique system displays selectivity to dinitrotoluene (71% quenching) over trinitrotoluene (20% quenching) with sub ppm sensitivity and response times of less than a minute. We show that this implementation of a graphene-based MOF composite provides a unique strategy in the development of molecularly well-defined materials having rapid, reversible, and gas selective fluorescent quenching capabilities. This opens the way for new advances in the assembly of low density frameworks using isomerization suppressed materials. © 2013 The Royal Society of Chemistry.

Justo J.J.,Dongguk University | Mwasilu F.,Dongguk University | Lee J.,Hanyang University | Jung J.-W.,Dongguk University
Renewable and Sustainable Energy Reviews | Year: 2013

This paper presents the latest comprehensive literature review of AC and DC microgrid (MG) systems in connection with distributed generation (DG) units using renewable energy sources (RESs), energy storage systems (ESS) and loads. A survey on the alternative DG units' configurations in the low voltage AC (LVAC) and DC (LVDC) distribution networks with several applications of microgrid systems in the viewpoint of the current and the future consumer equipments energy market is extensively discussed. Based on the economical, technical and environmental benefits of the renewable energy related DG units, a thorough comparison between the two types of microgrid systems is provided. The paper also investigates the feasibility, control and energy management strategies of the two microgrid systems relying on the most current research works. Finally, the generalized relay tripping currents are derived and the protection strategies in microgrid systems are addressed in detail. From this literature survey, it can be revealed that the AC and DC microgrid systems with multiconverter devices are intrinsically potential for the future energy systems to achieve reliability, efficiency and quality power supply. © 2013 Elsevier Ltd.

Yi J.,Hanyang University | Jang H.S.,Sookmyung Womens University | Lee J.S.,Sookmyung Womens University | Park W.I.,Hanyang University
Nano Letters | Year: 2012

Biosilification is of interest due to its capability to produce a highly intricate structure under environmentally friendly conditions. Despite the considerable effort that has been devoted toward biomimetic silification, the synthesis of highly complex silica structures, as found in the structures of diatom cell walls, is still in its infancy. Here, we report the bioinspired fabrication of well-organized and symmetric silica nanostructured networks, involving phase separation and silicic acid polymerization processes, in analogy to the morphogenesis of diatom cell walls. Our approach exploits self-assembled silica spheres as a self-source of the silicic acids as well as scaffolds that, interplayed with droplets of ammonium hexafluorosilicate, direct the site-specific silification. Moreover, we have achieved multiple morphological evolutions with subtle changes in the process, which demonstrates exquisite levels of control over silica morphogenesis. © 2012 American Chemical Society.

Shin J.-H.,National Rehabilitation Center | Ryu H.,Hanyang University | Jang S.H.,Hanyang University
Journal of NeuroEngineering and Rehabilitation | Year: 2014

Background: Virtual reality (VR) is not commonly used in clinical rehabilitation, and commercial VR gaming systems may have mixed effects in patients with stroke. Therefore, we developed RehabMaster™, a task-specific interactive game-based VR system for post-stroke rehabilitation of the upper extremities, and assessed its usability and clinical efficacy. Methods. A participatory design and usability tests were carried out for development of RehabMaster with representative user groups. Two clinical trials were then performed. The first was an observational study in which seven patients with chronic stroke received 30 minutes of RehabMaster intervention per day for two weeks. The second was a randomised controlled trial of 16 patients with acute or subacute stroke who received 10 sessions of conventional occupational therapy only (OT-only group) or conventional occupational therapy plus 20 minutes of RehabMaster intervention (RehabMaster + OT group). The Fugl-Meyer Assessment score (FMA), modified Barthel Index (MBI), adverse effects, and drop-out rate were recorded. Results: The requirements of a VR system for stroke rehabilitation were established and incorporated into RehabMaster. The reported advantages from the usability tests were improved attention, the immersive flow experience, and individualised intervention. The first clinical trial showed that the RehabMaster intervention improved the FMA (P =.03) and MBI (P =.04) across evaluation times. The second trial revealed that the addition of RehabMaster intervention tended to enhance the improvement in the FMA (P =.07) but did not affect the improvement in the MBI. One patient with chronic stroke left the trial, and no adverse effects were reported. Conclusions: The RehabMaster is a feasible and safe VR system for enhancing upper extremity function in patients with stroke. © 2014Shin et al.; licensee BioMed Central Ltd.

Nagajyoti P.C.,Hanyang University | Lee K.D.,Dongguk University | Sreekanth T.V.M.,Dongguk University
Environmental Chemistry Letters | Year: 2010

Metal contamination issues are becoming increasingly common in India and elsewhere, with many documented cases of metal toxicity in mining industries, foundries, smelters, coal-burning power plants and agriculture. Heavy metals, such as cadmium, copper, lead, chromium and mercury are major environmental pollutants, particularly in areas with high anthropogenic pressure. Heavy metal accumulation in soils is of concern in agricultural production due to the adverse effects on food safety and marketability, crop growth due to phytotoxicity, and environmental health of soil organisms. The influence of plants and their metabolic activities affects the geological and biological redistribution of heavy metals through pollution of the air, water and soil. This article details the range of heavy metals, their occurrence and toxicity for plants. Metal toxicity has high impact and relevance to plants and consequently it affects the ecosystem, where the plants form an integral component. Plants growing in metal-polluted sites exhibit altered metabolism, growth reduction, lower biomass production and metal accumulation. Various physiological and biochemical processes in plants are affected by metals. The contemporary investigations into toxicity and tolerance in metal-stressed plants are prompted by the growing metal pollution in the environment. A few metals, including copper, manganese, cobalt, zinc and chromium are, however, essential to plant metabolism in trace amounts. It is only when metals are present in bioavailable forms and at excessive levels, they have the potential to become toxic to plants. This review focuses mainly on zinc, cadmium, copper, mercury, chromium, lead, arsenic, cobalt, nickel, manganese and iron. © 2010 Springer-Verlag.

Hsu S.-H.,University of Florida | Woan K.,University of Florida | Sigmund W.,University of Florida | Sigmund W.,Hanyang University
Materials Science and Engineering R: Reports | Year: 2011

Superhydrophobic surfaces have received tremendous attention in the last decade, owing to the number of emerging applications in conservation of environment. These surface properties are based on physio-chemical principles and can be transferred into technical "biomimetic" materials, as successfully done for the Lotus leaves. This article provides a review of the most recent development in superhydrophobic surfaces. Examples of superhydrophobic surfaces from nature are presented. It focuses on the hairy exterior of many different plant and animal species which renders them water repellent for protecting and maintaining crucial life functions. The classical Wenzel and Cassie-Baxter models along with manufacturing and understanding of the wettability of flexible hairy structures are reviewed. © 2011 Elsevier B.V. All rights reserved.

Kim J.K.,Korea University | Choi K.-J.,CHA Medical University | Lee M.,Hanyang University | Jo M.-H.,CHA Medical University | Kim S.,CHA Medical University
Biomaterials | Year: 2012

MicroRNAs (miRNA, miR) have been reported as cancer biomarkers that regulate tumor suppressor genes. Hence, simultaneous detecting and inhibiting of miRNA function will be useful as a cancer theragnostics probe to minimize side effects and invasiveness. In this study, we developed a cancer-targeting therangostics probe in a single system using an AS1411 aptamer - and miRNA-221 molecular beacon (miR-221 MB)-conjugated magnetic fluorescence (MF) nanoparticle (MFAS miR-221 MB) to simultaneously target to cancer tissue, image intracellularly expressed miRNA-221 and treat miRNA-221-involved carcinogenesis. AS1411 aptamer-conjugated MF (MFAS) nanoparticles displayed a great selectivity and delivery into various cancer cell lines. The miR-221 MB detached from the MFAS miR-221 MB in the cytoplasm of C6 cells clearly imaged miRNA-221 biogenesis and simultaneously resulted in antitumor therapeutic effects by inhibiting miRNA function, indicating a successful astrocytoma-targeting theragnostics. MFAS miRNA MB can be easily applied to other cancers by simply changing a targeted miRNA highly expressed in cancers. © 2011 Elsevier Ltd.

The absorber of a collector receives solar energy which is delivered to the transport medium to be carried away as useful energy. During this process, temperature of the absorber plate increases and therefore, thermophysical parameters engaged to determine the thermal performance of an absorber plate varies with temperature of the plate. The present study demonstrates analytically to determine the performance of an absorber plate fin with temperature dependent both thermal conductivity and overall heat loss coefficient. The decomposition method is proposed for the solution methodology. An optimum design analysis has also been carried out. A comparative study has been executed among the present results and that of existed in the published work, and a notable difference in results has been found. Finally, unlike published work, dependency parameters on the performances and optimum design have been highlighted. © 2010 Elsevier Ltd. All rights reserved.

Cho E.,Hanyang University | Choi M.,Sungkyunkwan University
Journal of Hydrology | Year: 2014

An understanding soil moisture spatio-temporal variability is essential for hydrological and meteorological research. This work aims at evaluating the spatio-temporal variability of near surface soil moisture and assessing dominant meteorological factors that influence spatial variability over the Korean peninsula from May 1 to September 29, 2011. The results of Kolmogorov-Smirnov tests for goodness of fit showed that all applied distributions (normal, log-normal and generalized extreme value: GEV) were appropriate for the datasets and the GEV distribution described best spatial soil moisture patterns. The relationship between the standard deviation and coefficient of variation (CV) of soil moisture with mean soil moisture contents showed an upper convex shape and an exponentially negative pattern, respectively. Skewness exhibited a decreasing pattern with increasing mean soil moisture contents and kurtosis exhibited the U-shaped relationship. In this regional scale (99,720 km2), we found that precipitation indicated temporally stable features through an ANOVA test considering the meteorological (i.e. precipitation, insolation, air temperature, ground temperature and wind speed) and physical (i.e. soil texture, elevation, topography, and land use) factors. Spatial variability of soil moisture affected by the meteorological forcing is shown as result of the relationship between the meteorological factors (precipitation, insolation, air temperature and ground temperature) and the standard deviation of relative difference of soil moisture contents (SDRDt ) which implied the spatial variability of soil moisture. The SDRDt showed a positive relationship with the daily mean precipitation, while a negative relationship with insolation, air temperature and ground temperature. The variation of spatial soil moisture pattern is more sensitive to change in ground temperature rather than air temperature changes. Therefore, spatial variability of soil moisture is greatly affected by meteorological factors and each of the meteorological factors has certain duration of effect on soil moisture spatial variability in regional scale. The results provide an insight into the soil moisture spatio-temporal patterns affected by meteorological and physical factors simultaneously, as well as the design criteria of regional soil moisture monitoring network at regional scale. © 2014 Elsevier B.V. All rights reserved.

Li N.,National Research Council Canada | Li N.,Georgia Institute of Technology | Guiver M.D.,National Research Council Canada | Guiver M.D.,Hanyang University
Macromolecules | Year: 2014

The search for the next generation of highly ion-conducting polymer electrolyte membranes has been a subject of intense research because of their potential applications in energy storage and transformation devices, such as fuel cells, vanadium flow batteries, membrane-based artificial photosynthesis, water electrolysis, or water treatment processes such as electrodialysis desalination. Nanochannels that contain ionic groups, through which "hydrated" ions can pass, are believed to be of key importance for efficient ion transport in polymer electrolytes membranes. In this Perspective, we present an overview of the approaches to induce ion-conducting nanochannel formation by self-assembly, using polymer architecture such as block or comb-shaped copolymers. The transport properties of ion-containing aromatic copolymers are examined to obtain an insight into the fundamental behavior of these materials, which are targeted toward applications in fuel cells and other electrochemical devices. Challenges in obtaining well-defined nanochannel morphologies, and possible strategies to improve transport properties in aromatic copolymers having structures with the potential to withstand operation in electrochemical/chemical devices, are discussed. Opportunities for the application of ion-containing aromatic copolymer membranes in fuel cells, vanadium flow batteries, membrane-based artificial photosynthesis, electrolysis, and electrodialysis are also reviewed. Research needs for further improvements in ionic conductivity and durability, and their applications are identified. © Published 2014 by the American Chemical Society.

Victor R.A.,University of Manchester | Kim J.-K.,Hanyang University | Smith R.,University of Manchester
Energy | Year: 2013

An optimisation model for the composition of mixed working fluids for (Organic Rankine Cycles) ORCsand Kalina cycles has been developed. The temperatures investigated were 100°C-250°C for the heat source and 30°C for the heat sink. The optimisation method of the composition was carried out with Simulated Annealing technique with the objective function of maximising the thermal efficiency of the cycle, based on 1MW of heat source. The results show that the pure component organic fluids are more energy-efficient than mixed organic fluids. The selection of organic working fluids was studied for achieving maximum cycle efficiency at a given operating temperature. The composition of the Kalina cycle was also optimised and it was found that for a maximum temperature of 250°C, the minimum ammonia concentration in the ammonia-water mixture was 73.8% mol fraction. A novel consideration of employing alcohol-water mixtures in the cycle was also investigated and the most efficient mixture at 250°C was methanol and water mixture when compared to the Kalina cycle and steam Rankine Cycle. The study showed overall that the optimal choice of working fluids for a particular type of cycle would depend on the operating temperature and pressure. The developed design method can be useful for engineers to evaluate the performance of the cycles considering a wide range of working fluids, and determines the optimal choice of working fluids and operating conditions of the cycle. © 2013 Elsevier Ltd.

Song T.,University of Maryland University College | Hu L.,University of Maryland University College | Paik U.,Hanyang University
Journal of Physical Chemistry Letters | Year: 2014

One dimensional (1D) silicon nanostructures have attracted significant interest as an anode material for lithium ion batteries (LIBs) as its 1D geometry accommodates the large volume change of the Si during cycling and enables facile electron transport during all stages of operation. Furthermore, the high aspect ratio of 1D Si nanostructures enables us to investigate atomic-scale mechanisms of the lithiation process and corresponding volume change behavior. Various 1D nanostructures with different morphologies and compositions have been explored to achieve a robust cycle performance, reversible morphological changes, and high rate capabilities. In this Perspective, we summarize the recent significant advances of 1D Si nanostructures and discuss electrode design strategies based on the recent geometry and composition engineering. © 2014 American Chemical Society.

Choi Y.C.,Korea Research Institute of Chemical Technology | Lee D.U.,Hanyang University | Noh J.H.,Korea Research Institute of Chemical Technology | Kim E.K.,Hanyang University | And 2 more authors.
Advanced Functional Materials | Year: 2014

The light-harvesting Sb2S3 surface on mesoporous-TiO2 in inorganic-organic heterojunction solar cells is sulfurized with thioacetamide (TA). The photovoltaic performances are compared before and after TA treatment, and the state of the Sb2S3 is investigated by X-ray diffraction, X-ray photoelectron spectroscopy, and deep-level transient spectroscopy (DLTS). Although there are no differences in crystallinity and composition, the TA-treated solar cells exhibit significantly enhanced performance compared to pristine Sb2S3-sensitized solar cells. From DLTS analysis, the performance enhancement is mainly attributed to the extinction of trap sites, which are present at a density of (2-5) × 1014 cm-3 in Sb2S3, by TA treatment. Through such a simple treatment, the cell records an overall power conversion efficiency (PCE) of 7.5% through a metal mask under simulated illumination (AM 1.5G, 100 mW cm-2) with a very high open circuit voltage of 711.0 mV. This PCE is, thus far, the highest reported for fully solid-state chalcogenide-sensitized solar cells. The light-harvesting Sb 2S3 surface on mesoporous-TiO2 in inorganic-organic heterojunction solar cells is sulfurized with thioacetamide. Through such a simple treatment, the cell records an overall power conversion efficiency of 7.5% under simulated illumination (AM 1.5G, 100 mW cm -2) and the performance enhancement is mainly attributed to the extinction of trap sites by deep-level transient spectroscopy analysis. © 2014 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim.

Cho H.,Massachusetts Eye and Ear Infirmary | Cho H.,Hanyang University | Sobrin L.,Massachusetts Eye and Ear Infirmary
Current Diabetes Reports | Year: 2014

Diabetic retinopathy (DR) is a polygenic disorder. Twin studies and familial aggregation studies have documented clear familial clustering. Heritability has been estimated to be as high as 27 % for any DR and 52 % for proliferative diabetic retinopathy (PDR), an advanced form of the disease. Linkage analyses, candidate gene association studies and genome-wide association studies (GWAS) performed to date have not identified any widely reproducible risk loci for DR. Combined analysis of the data from multiple GWAS is emerging as an important next step to explain the unaccounted heritability. Key factors to future discovery of the genetic underpinnings of DR are precise DR ascertainment, a focus on the more heritable disease forms such as PDR, stringent selection of control participants with regards to duration of diabetes, and methods that allow combination of existing datasets from different ethnicities to achieve sufficient sample sizes to detect variants with modest effect sizes. © 2014 Springer Science+Business Media.

Kim H.,Seoul National University | Um E.,CHA Medical University | Cho S.-R.,Yonsei University | Jung C.,Hanyang University | And 2 more authors.
Nature Methods | Year: 2011

Zinc-finger nucleases (ZFNs) and TAL-effector nucleases (TALENs) are powerful tools for creating genetic modifications in eukaryotic cells and organisms. But wild-type and mutant cells that contain genetic modifications induced by these programmable nucleases are often phenotypically indistinguishable, hampering isolation of mutant cells. Here we show that transiently transfected episomal reporters encoding fluorescent proteins can be used as surrogate genes for the efficient enrichment of endogenous gene-modified cells by flow cytometry. © 2011 Nature America, Inc. All rights reserved.

Wang Y.,University of Manchester | Smith R.,University of Manchester | Kim J.-K.,Hanyang University
Applied Thermal Engineering | Year: 2012

Heat exchanger network retrofit plays an important role in energy saving in process industry. Many design methods for the retrofit of heat exchanger networks have been proposed during the last three decades. Conventional retrofit methods rely heavily on topology modifications which often result in a long retrofit duration and high initial costs. Moreover, the addition of extra surface area to the heat exchanger can prove difficult due to topology, safety and downtime constraints. Both of these problems can be avoided through the use of heat transfer enhancement in heat exchanger network retrofit. This paper presents a novel design approach to solve heat exchanger network retrofit problems based on heat transfer enhancement. An optimisation method based on simulated annealing has been developed to find the appropriate heat exchangers to be enhanced and to calculate the level of enhancement required. The physical insight of enhanced exchangers is also analysed. The new methodology allows several possible retrofit strategies using different retrofit methods be determined. Comparison of these retrofit strategies demonstrates that retrofit modification duration and payback time are reduced when heat transfer enhancement is utilised. Heat transfer enhancement can be also used as a substitute for increased heat exchanger network surface area to reduce retrofit investment costs. © 2011 Elsevier Ltd. All rights reserved.

Cho E.J.,Hanyang University | Kim J.S.,Ewha Womans University
Journal of Physical Chemistry B | Year: 2012

We investigate the phase separation of Lennard-Jones (LJ) particles in the presence of cosolute crowders using molecular dynamics simulations. In the absence of crowders, LJ particles phase-separate and form liquid and vapor phases only when the attraction between LJ particles is strong enough such that kBT/ε is less than 1.085, where ε is the attraction strength of the LJ potential, kB is the Boltzmann constant, and T is the temperature. On the other hand, the phase separation of LJ particles is observed even for larger kBT/ε and thus for weaker attractions when volume exclusive, repulsive crowders are present. Although the impact of crowding becomes less significant as the attraction between crowders and LJ particles is increased, the phase separation observed from simulations containing both nonattractive and attractive crowders shows that the crowding-induced phase separation by nonattractive crowders is still very significant even in the presence of other attractive crowders. This occurs because not only LJ particles but also attractive crowders are subject to the excluded volume effect of nonattractive crowders and found together in the condensed phase. This study suggests that the excluded volume effect in the crowded nuclear environment may play a crucial role in the formation and maintenance of biological structures in a cell, such as nuclear bodies including nucleoli and cajal bodies. © 2012 American Chemical Society.

The physics of structure formation and maintenance of nuclear bodies (NBs), such as nucleoli, Cajal bodies, promyelocytic leukemia bodies, and speckles, in a crowded nuclear environment remains largely unknown. We investigate the role of macromolecular crowding in the formation and maintenance of NBs using computer simulations of a simple spherical model, called Lennard-Jones (LJ) particles. LJ particles form a one-phase, dilute fluid when the intermolecular interaction is weaker than a critical value, above which they phase separate and form a condensed domain. We find that when volume-exclusive crowders exist in significant concentrations, domain formation is induced even for weaker intermolecular interactions, and the effect is more pronounced with increasing crowder concentration. Simulation results show that a previous experimental finding that promyelocytic leukemia bodies disappear in the less-crowded condition and reassemble in the normal crowded condition can be interpreted as a consequence of the increased intermolecular interactions between NB proteins due to crowding. Based on further analysis of the simulation results, we discuss the acceleration of macromolecular associations that occur within NBs, and the delay of diffusive transport of macromolecules within and out of NBs when the crowder concentration increases. This study suggests that in a polydisperse nuclear environment that is enriched with a variety of macromolecules, macromolecular crowding not only plays an important role in the formation and maintenance of NBs, but also may perform some regulatory functions in response to alterations in the crowding conditions. © 2012 by the Biophysical Society.

The urea-SCR catalyst system has the advantages of high NOx conversion efficiency and a wide range of operating conditions. The key factors for successful implementation of urea-SCR technology are good mixing of urea (ammonia) and gas to reduce ammonia slip. Urea mixer components are required to facilitate evaporation and mixing, because it is difficult to evaporate urea in the liquid state; the distance to the mixer is the most critical factor affecting mixer performance. In this study, to determine the optimal distance from the injector to the mixer for urea injection, we used laser diagnostics and a high speed camera to analyze the spray characteristics of a urea injector and to determine the distribution of urea solution droplets in a transparent manifold. The spray angle with a certain value (α) was measured, the injection quantity was about 9.4208 g/s, the SMD was approximately 65 μm, and then the position Bd was the optimal location for installation of mixer. In addition, we calculated the droplet uniformity index (DUI) from the acquired images using digital image processing to clarify the distribution of the sprayed droplets. Analysis of the quantitative characteristics and spatial distribution of the droplets revealed that addition of mixers resulted in more uniform distribution of the urea solution in the exhaust pipe and improved the performance of the urea-SCR catalyst system. A grid-channel plate-type mixer was optimal for maintaining a high the DUI which increased 32% than the case without a mixer, and the NOx conversion efficiency which was 85-90%. © 2013 Elsevier Ltd. All rights reserved.

Koku O.,University of Manchester | Perry S.,University of Manchester | Kim J.-K.,Hanyang University
Applied Energy | Year: 2014

This paper addresses a conceptual study investigating the techno-economic feasibility for the thermal Integration of LNG cold vaporisation energy in power generation applications. In conventional regasification systems, this valuable LNG cold energy is often being wasted to ambient heat sources, representing a thermodynamic inefficient process with a significant thermal impact on the local environment. A combined facility consisting of a non-integrated Combined Cycle Power Plant (CCPP) and an LNG receiving terminal employing traditional Open Rack Vaporisers (ORV) technology, has been modelled, as a base case. Retrofit strategies for the integration of LNG cold energy have been investigated, and their impacts on power production and system efficiency are systematically compared. Retrofit design options considered in this work include the use of a propane Rankine cycle coupled with the direct expansion of natural gas, the integration of a closed-loop water cycle or open-loop water circuit with a steam Rankine cycle, and the facilitation of integrated air cooling for a gas turbine. © 2013 Elsevier Ltd.

Lee I.-H.,Hankyong National University | Kim D.,Hanyang University
IEEE Communications Letters | Year: 2012

Opportunistic cooperation (OC) dynamically switches between a cooperative mode (CM, using direct and relayed links) and a non-cooperative mode (NM, using only the direct link). In this letter, we consider OC in amplify-andforward (AF) relaying systems where a best relay is selected as an active relay if CM is selected. The OC is shown to have the same full diversity order as the CM. In terms of asymptotic outage probability, we show that the power gain (sometimes also referred to coding gain) achieved from using the OC compared to the CM is 10/K+1 log 10 (1 - ((2 R)/(2 R + 1)) K+1) dB where R is the data rate used for outage threshold. The result says that the power gain is always positive (in dB) and it increases when the data rate increases or the number of relays decreases. Numerical results are provided to verify the analysis and to give insights on the outage performance of the OC. © 2012 IEEE.

Tasan A.S.,Dokuz Eylül University | Gen M.,Fuzzy Logic Systems Institute FLSI | Gen M.,Hanyang University
Computers and Industrial Engineering | Year: 2012

The vehicle routing problem with simultaneous pick-up and deliveries, which considers simultaneous distribution and collection of goods to/from customers, is an extension of the capacitated vehicle routing problem. There are various real cases, where fleet of vehicles originated in a depot serves customers with pick-up and deliveries from/to their locations. Increasing importance of reverse logistics activities make it necessary to determine efficient and effective vehicle routes for simultaneous pick-up and delivery activities. The vehicle routing problem with simultaneous pick-up and deliveries is also NP-hard as a capacitated vehicle routing problem and this study proposes a genetic algorithm based approach to this problem. Computational example is presented with parameter settings in order to illustrate the proposed approach. Moreover, performance of the proposed approach is evaluated by solving several test problems. © 2011 Elsevier Ltd. All rights reserved.

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