Browsing by Author "Kuo, Chung-Wei"

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Freeway drivers' willingness to pay for an on board unit under an electronic toll collection system
(2013-02-01)
Jou, Rong-Chang
;
Chiou, Yu-Chiun
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Kuo, Chung-Wei
;
Tan, Hao-I
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運輸與物流管理系註：原交通所+運管所
Electronic toll collection (ETC) systems have been put into practice in one or two channels at toll plazas on Taiwan's freeways since 2006. The utilisation of the ETC system has been flat due to the extra cost of installing the on board unit (OBU) that is used in the system. To increase the utilisation rate of the ETC system, it is crucial to understand the real price that drivers are willing to pay. Therefore, this study investigates freeway drivers' willingness to pay a value for an OBU. A stated preference experiment is designed to obtain the willingness to pay at three different levels of use. To avoid the estimation bias due to a large percentage with a zero willingness to pay, a spike model is used. Different markets are segmented to examine their willingness to pay for an OBU. The estimation results show that the willingness to pay for an OBU is NT$727/unit(1) for short distance drivers, NT$830 for medium distance drivers, and NT$1308/unit for long distance drivers. (C) 2012 Elsevier Ltd. All rights reserved.
Receiving Performance Enhancement of Active GPS Antenna with Periodic Structure
(2011)
Lin, Han-Nien
;
Lin, Ke-Wen
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Kuo, Chung-Wei
;
Huang, Yu-Jie
;
電信工程研究所
The purpose of this study is to design the high gain active GPS antenna module and analyze the performance improvement implemented with periodic structure. Since the utilization of high-impedance surface of periodic structures as reflector not only significantly reduces the antenna profile with phase enhancement, but it will also enhance its gain and directivity performance. We first investigated the electromagnetic radiation suppression characteristic of Electromagnetic Band-Gap (EBG) structure and utilized the microstrip measurement method to verify the simulation result for required stopband and performance. In this study, we design microstrip antenna and periodic structure with center frequency at 1.575 GHz for Global Positioning System (GPS) to investigate the effect with applications of EBG structure on antenna. Microstrip antenna has the industrial demanding characteristics of light weight, low profile, and easy integration with circuits on PCB. We investigated surface wave suppression and axial ratio improvement with the antenna surrounded by matching resonant EBG structure. Finally, we design the front-end low noise amplifier (LNA) with center frequency at 1.575 GHz to integrate with antenna to further improve GPS receiving sensitivity.