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Wang C.-Y.,TransWorld University | Hwang R.-H.,National Chung Cheng University | Hwang R.-H.,University Rd | Ting C.-K.,National Chung Cheng University
Expert Systems with Applications | Year: 2011

The increased prevalence of digital devices with communication capability heralds the era of ubiquitous computing, as predicted by Mark Weiser. Ubiquitous computing aims to provide users with intelligent human-centric context-aware services at anytime anywhere. Optimal path planning in a ubiquitous network considers the needs of users and the surrounding context. This approach is very different from that applied by existing research on car navigation and mobile robots. This study proposes a context-aware path planning mechanism based on spatial conceptual map (SCM) and genetic algorithm (GA), referred to as UbiPaPaGo. The SCM model is adopted to represent the real map of the surrounding environment. The optimal path is planned using a GA, which is a robust metaheuristic algorithm. UbiPaPaGo attempts to automatically find the best path that satisfies the requirements of an individual user. A prototype of UbiPaPaGo is implemented to demonstrate its feasibility and scalability. Experimental results validate the effectiveness and the efficiency of UbiPaPaGo in finding the optimal path. © 2010 Elsevier Ltd. All rights reserved. Source


O'Dea J.,University Rd | Siersema P.D.,University Utrecht
Therapeutic Advances in Gastroenterology | Year: 2013

Background: When treating achalasia, balloon dilation is often combined with fluoroscopy to allow the lower esophageal sphincter to be visualized as it is being dilated. We sought to evaluate a new balloon dilation technology, EsoFLIP, which allows the shape of the balloon to be visualized in a nonradiographic manner by using impedance planimetry electrodes located within the dilation balloon. Methods: Two pigs weighing 35 kg were used. The EsoFLIP balloon dilator was introduced under endoscopic visualization. Successive injections of 50, 60, 70 and 85 mL into the dilation balloon permitted dilations at increasing diameters to be achieved. Following each dilation fluid was withdrawn to leave 30 mL in the balloon and an EsoFLIP image was captured to track progressive dilation of the gastroesophageal junction (GEJ). Results: The EsoFLIP catheter was safely deployed in the two pigs and no complications were noted. For pig 1, during dilation, the measured balloon diameter at the waist was 24.1, 28.9, 29.2 and 30.0 mm for balloon dilation volumes of 50, 60, 70 and 85 mL respectively. For pig 2 the corresponding diameter at the waist was 22.8, 27.1, 28.5 and 29.4 mm. The GEJ diameter increased from 12.5 and 12.4 mm to 17.4 and 17.5mm for pigs 1 and 2 respectively. Distensibility of the GEJ in pig 1 increased from 2.3 mm2/mmHg before to 4.4 mm2/mmHg after dilation and in pig 2 from 4.4 to 9.6 mm2/mmHg. The GEJ substantively achieved its final diameter after the dilation using just 50 mL in the balloon. Conclusions: We demonstrated technical feasibility and safety of the EsoFLIP dilator in a porcine model. Further studies in humans with achalasia remain to be conducted, which, besides demonstrating technical feasibility, should also evaluate the use of distensibility measurements taken during dilation to predict outcomes. © The Author(s), 2012. Source


Walsh B.,University Rd
Irish medical journal | Year: 2010

This study investigated differences in uptake of breast and cervical cancer screening relating to socio-economic characteristics in the Republic and Northern Ireland. Multivariate analyses were performed using data from population-based surveys that detail breast and cervical cancer screening participation in the preceding 12 months in the two jurisdictions. Cervical screening rates were significantly higher in Northern Ireland where 536/1764 (30%) eligible women attended screening in comparison to the Republic where only 780/4472 (17%) eligible women attended screening. Differences in participation related to socio-economic group and education were also observed in screening programmes for cervical cancer (Wald: p = 0.000; p = 0.010) and related to education for breast cancer (Wald: p = 0.008) in the Republic of Ireland. Differences in participation across socio-economic groups in respect of breast and cervical cancer screening were not replicated in Northern Ireland. These differences may contribute to inequalities in treatment and outcomes across socio-economic groups in the Republic of Ireland. Source


Wang Y.-B.,Tamkang University | Wu T.-Y.,Tamkang University | Lee W.-T.,Tamkang University | Ke C.-H.,University Rd
24th IEEE International Conference on Advanced Information Networking and Applications Workshops, WAINA 2010 | Year: 2010

In recent years, the issue of Vehicular Ad-Hoc Network (VANET) has received great attention, and more and more VANET-related researches have been brought up. Generally speaking, the biggest difference between VANET and traditional Ad-Hoc is the velocity of carriers because in VANET, the velocity of vehicles the carriers is much higher than that of the carriers in traditional Ad-Hoc. Furthermore, it would be a great challenge to forward data efficiently in VANETs. Thus, many researches proposed have focused on the development of Routing Protocols. The main purpose of this paper is to investigate Geographic Position-Based Routing Protocol, which needs Global Position System (GPS) to obtain the positions of vehicles and to enhance the decision-making of data delivery. Therefore, only partial topology information is needed during the decision-making of data delivery for the routing protocol to have better adaptability in highspeed network topology. This paper aims to improve Greedy Perimeter Stateless Routing (GPSR) Protocol and implement our proposed scheme into a complex scenario like urban area. For this reason, with the concept of vector, greedy forwarding mode of GPSR not only concerns the distance to enhance the accuracy of routing data while choosing the next hop, but also, in terms of the intersections in urban area, adds a predictive mode to predict the motions of vehicles at the intersections to improve the efficiency of routing protocol. © 2010 IEEE. Source


Chao Y.F.,University Rd | Lin P.L.,University Rd
Optics Communications | Year: 2010

The three-intensity technique is used to calibrate a photoelastic modulator by its temporal waveform. This method not only allows us to measure the intrinsic static phase retardation and modulation amplitude but also provides the evidence for the existence of circular dichroism (CD) in the photoelastic modulator. In this report, we will demonstrate the averaged intensity for normalization in this PEM modulated light not only depicts a periodic modulation, it also exhibits anti-symmetric distributions at P = 45° and P = -45°, which was considered as constant for conventional PEM ellipsometry. Four models were examined to verify that only a circular dichroism medium coupled with the periodical induced birefringence modulator can explain the phenomena. This work can quantitatively measure the artifactual CD effect of PEM and reduce its system error in CD spectrometer which consists of a PEM. © 2010 Elsevier B.V. All rights reserved. Source

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