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( Koay Yew-chin ),김두기 ( Kim Dookie ),김기홍 ( Kim Ki-hong ),권민호 ( Kwon Min-ho ),김진호 ( Kim Jin-ho ) 한국구조물진단유지관리공학회 2008 한국구조물진단유지관리공학회 학술발표대회 논문집 Vol.12 No.2
After several earthquakes happened and bought about serious damage to some underground subway structures. A safe underground subway structure to perform well during an earthquake is always a great concern by many engineers and researchers. They believed that the underground subway structures shall have some strengthen measures during an earthquake. This research is focused with strengthening the underground subway structures in order to withstand future earthquakes without excessive damage.
Reviews: Torsional spring mechanism resonant scanner’s technology
Loke Kean Koay,Nur Azirah Abdul Rahim 대한기계학회 2016 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.30 No.4
The design parameters of torsional spring mechanism resonant scanner are the scanning angle, frequency and also power consumption. Generally, high resolution scanning is desired due to the reason of smaller devices are developed. This review covers the linear optical and rotational scanner technologies for both the MEMS and non-MEMS. The overview of scanner technology is discussed accordingly to the recent researches and development performed on the scanning technology. The review is categorized into several sub-topics according to the scanner’s components. The component includes the actuator used, the compliant structure and the control system. Furthermore, damping characteristics are also presented in this review as it affected the scanning angle for the scanner. Finally, the application of the scanner is discussed conferring to the fields. The fields include light detection and ranging systems, medical and also biomedical systems. This review serves as the reference for the mechanical design of the scanning devices.
Agung Sembada,Koay Kian Yeik 글로벌지식마케팅경영학회 2018 Global Marketing Conference Vol.2018 No.07
Reports indicate that in 2017, social commerce had become a 20 billion dollar industry. Given the developing world’s fatigue with social media, social commerce growth will likely be fueled by consumers from developing economies. While literature has investigated social commerce in the context of established brands in developed economies (e.g. Kim and Ko, 2012), it cannot yet explain consumers’ engagement with the uniqueness of social media commerce in developing economies. Social commerce in Southeast Asian economies are largely conducted amongst individuals or micro businesses. Since social media platforms largely do not provide commerce security nor support, consumers are more vulnerable to fraudulent practices. What factors motivate these purchases despite such risks? This study offers insights into how consumers’ motivated reasoning influences their willingness to purchase over social media. We focus on the social media store’s ease of use and perceived security as antecedents of trust. Specifically, we argue that perceiving a lack of ability to purchase from other channels would induce higher trust towards a social media store, despite low perceptions of ease and security of transaction. Data was collected from 224 Indonesian social media users who have been exposed to social media stores on Instagram. The findings suggest that when consumers perceive high control of how they could obtain desired goods, trust becomes a logical function of the perceived safety and ease of use of the shops. However, under low perceived control, consumers display high trust in social media shops despite not being convinced that they are safe nor easy to use. The findings extend our understanding about the antecedents of value creation in social commerce (Stephen and Toubia, 2010). Our results enrich prior literature by showing how motivated reasoning leads to biases in judgment to be in favor of desired goals (Blanton and Gerrard, 1997), and extends it in the novel context of social media commerce. Furthermore, by incorporating the literature on perceived behavioral control and motivated reasoning, the current study provides important empirical evidence for the presence of perceived control over alternate channels as a significant driver for trust towards social media shops. The current research also has a number of implications for social commerce providers in developing economies. This study shows that it is advantageous for managers to cultivate trust using interactivity and reliability to elicit a sense of security and ease of use. However, our findings also offers a caution for firms to not be lulled into a false sense of comfort by taking consumers’ trust at face value.
PACKET TRAFFIC MANAGEMENT IN UBIQUITOUS HEALTHCARE SYSTEM
Chung, Wan-Young,Koay, Su-Lin,Jung, Sang-Joong,Kwon, Tae-Ha National Taiwan University 2012 Biomedical engineering Vol.24 No.2
<P> Recent advances in wireless sensor network (WSN) envisaging ubiquitous healthcare system that simplifies the monitoring and treatment of patients. WSN also pose several challenges to ubiquitous healthcare applications. As healthcare application commonly handle two different types of data such as wave-like data of ECG and linear waveform-independent data of body temperature, blood pressure and oxygen content. As wave-like data requires a higher sampling rate than waveform-independent data, the transmission of wave-like data in WSN causes traffic congestion and, consequently, loss of vital signal in transmission. With the increasing number of sensor nodes involved in the WSN field, network congestion issue is rapidly coming known as a tangible issue in healthcare system that must be addressed in order to maintain data reliability. Sensor nodes have very limited computational resources due to its energy consumption. To reduce traffics in WSN communication, the biomedical data are sent when they had very serious problems. The collaboration among sensors through task mapping based in-network processing is adapted to achieve higher processing power and reduce traffics in WSN. System analysis shows that the data packet loss in the ubiquitous healthcare system is dramatically reduced after the implementation of this process. By adapting fall detection, not only the numbers of packets received by the base station are greatly reduced but also the traffic overload problems in WSN are also resolved. </P>
Reduction of ANFIS-Rules Based System through K-Map Minimization for Traffic Signal Controller
Azura Che Soh,Koay Yee Kean 제어로봇시스템학회 2012 제어로봇시스템학회 국제학술대회 논문집 Vol.2012 No.10
Adaptive-Neural Fuzzy Inference System (ANFIS) traffic signal controller is an intelligent traffic signal controller which has the ability to coordinate the traffic problem by adapting the traffic changes. The number of design rule sets increases the accuracy of the controller. Thus, the complexity of the system and the computation time also increase. Rule minimization based on Karnaugh Map (K-Map) has been done and applied to design the rules of ANFIS for traffic signal controller in order to have optimized performance. The ANFIS traffic signal controller is developed using FIS editor in MATLAB. This controller is applied to control the traffic flow in multilane-multiple traffic intersection. The performance of the developed ANFIS traffic signal controller is compared to existing ANFIS traffic signal controller with the original rules. Indeed, the developed ANFIS traffic signal controller is proven to have a better performance.