• 한국철도학회:학술대회논문집
• /
• 한국철도학회 2004년도 춘계학술대회 논문집
• /
• pp.645-651
• /
• 2004

For the connection of trans-continental railway network, it is critical to conquer the break-of-gauge problem at the borders in different countries. Up to now, the best solution seems to be the employ of the auto-changable gauge equipment. Countries, such as Russia, Japan are developing and commercializing auto-changable gauge equipment to maximize transport efficiency for the trans-continental network. The efforts to search a suitable logistical service are also underway. In this paper, technology and development trend of this equipment in several countries is indicated through inspecting and analyzing the historical and current situation of development, operating mechanism and technical problems. As the basic technology of auto-changeable gauge is not well developed in our country, the purpose of this study is to search an approach to fix the research direction, and find practical ways to international cooperation.

• 전기학회논문지
• /
• 제59권5호
• /
• pp.854-859
• /
• 2010

Distribution Automation System(DAS) is designed to improve operational efficiency by acquisition and control of remote data using its components such as central computation units, communication network and feeder remote terminal units. A conventional human machine interface of the DAS adopts a schematic diagram which is made by drawing power equipments on the geographic information system map. The single line diagram is more useful than the schematic diagram for the main tasks of distribution system operation such as protective relay coordination, service restoration and loss minimization. Since the configuration of the distribution line is changed according to the relocation of the open tie switches, the auto-drawing algorithm based on the connection between the sections and the switches is an essential technique. This paper proposes a new auto-drawing algorithm for a single line diagram of distribution systems based on tertiary tree and collision avoidance method. The feasibility of the proposed algorithm has been testified for various cases using practical distribution system with 12 feeders.

• 한국산학기술학회:학술대회논문집
• /
• 한국산학기술학회 2009년도 춘계학술발표논문집
• /
• pp.458-460
• /
• 2009

The parameters of PID controller should be readjusted whenever system character change. In spite of a rapid development of control theory, this work needs much time and effort of expert. In this paper, to resolve this defect, after the sample of parameters in the changeable limits of system character is obtained, these parametrs are used as desired values of back propagation learning algorithm, also neural network auto tuner for PID controller is proposed by determing the optimum structure of neural network. Simulation results demonstrate that auto-tuning proper to system character can work well.

• 한국지능시스템학회논문지
• /
• 제24권4호
• /
• pp.418-423
• /
• 2014

지능형교통체계(Intelligent Transportation Systems, ITS)는 첨단 교통체계의 구성요소, 통신, 컴퓨터 및 제어 기술을 활용하여 실시간으로 교통정보를 수집하고 가공하여 교통 이용자에게 제공함으로써 교통체계의 지능성, 안전성과 효율성을 추구하는 것을 말한다. 그러나 지능형교통체계는 도시의 경관과 어울리게 구성하고자 하는 각 도시들의 환경 정책에 따라 시스템의 크기와 모양이 다양하며, 따라서 실시간으로 제공되는 정보나 데이터가 각 시스템마다 다 다르다. 이에 정보 서비스 제공을 위한 디바이스를 제조하는 업체들은 요구가 발생되는 정보 서비스에 따라 매번 다른 메시지 프레임을 갖는 시스템을 제작해야 한다. 이러한 작업은 많은 시간과 인력이 낭비된다. 이에 본 논문에서는 다양한 메시지 프레임을 쉽게 설정하여 디스플레이 장치들을 현지에 직접 방문하지 않고, 테스트하기 위한 메시지 프레임을 자동으로 생성하는 기법을 제안하고 윈도우즈 환경에서 시스템을 개발하였다.

• KSII Transactions on Internet and Information Systems (TIIS)
• /
• 제5권7호
• /
• pp.1230-1251
• /
• 2011

This document specifies a new IPv6 deployment protocol called CHANC, which stands for Configuring Hosts to Auto-detect (IPv6, IPv6-in-IPv4, or IPv4) Network Connectivity. The main part is an application level tunneling protocol that allows Internet Service Providers (ISPs) to rapidly start deploying IPv6 service to their subscribers whom connected to the Internet via IPv4-only access networks. It carries IPv6 packets over HTTP protocol to be transmitted across IPv4-only network infrastructure. The key aspects of this protocol are: offers IPv6 connectivity via IPv4-only access networks, stateless operation, economical solution, assures most firewall traversal, and requires simple installation and automatic configuration at customers' hosts. All data packets and routing information of the IPv6 protocol will be carried over the IPv4 network infrastructure. A simple application and a pseudo network driver must be installed at the end-user's hosts to make them able to work with this protocol. Such hosts will be able to auto-detect the ISP available connectivity in the following precedence: native IPv6, IPv6-in-IPv4, or no IPv6 connectivity. Because the protocol does not require changing or upgrading customer edges, a minimal cost in the deployment to IPv6 service should be expected. The simulation analysis showed that the performance of CHANC is pretty near to those of native IPv6, 6rd, and IPv4 protocols. Also, the performance of CHANC is much better than that of D6across4 protocol.

• 대한교통학회지
• /
• 제26권1호
• /
• pp.25-35
• /
• 2008

현재 수도권에서 추진 중인 많은 광역철도 노선 확충은 승용차를 포함한 주변 대중교통체계 전반에 영향을 미친다. 그러나 이와 같은 영향에 대한 실증적인 분석 사례는 많지 않아 광역대중교통시설 확충 효과를 정확하게 계량하기 어렵고, 효율적인 정책을 수립하기 위한 근거가 부족한 실정이다. 본 연구에서는 광역철도 개통이 주변 교통체계에 미치는 영향을 중앙선 광역철도 사례를 중심으로 수송수요 측면에서 분석하였으며, 이를 토대로 장래 대중교통 수단별 수요변화를 검토하는 것을 목적으로 하였다. 통계자료 분석결과, 광역철도의 개통이 주변 교통체계에 미치는 영향은 승용차(33.3%)에 비해 버스(66.5%)가 큰 것으로 나타났다. 또한 서울버스에 비해서는 경기버스에 미치는 영향이 큰 것으로 분석되었다. 이용객을 대상으로 한 설문조사 분석결과도 통계자료 분석과 유사한 결과가 도출되었다. 결론적으로 승용차 이용객들은 대중교통 시설의 확충이나 서비스 개선 등에 영향을 덜 받는 것을 알 수 있었다. 반면에 기존 버스 이용자들의 경우는 광역철도 개통 등 대중교통 시설 확충이나 서비스 개선에 민감하게 반응하는 것을 알 수 있었으며, 광역철도 개통으로 인하여 버스의 수요가 19% 가량 감소함을 확인할 수 있었다.

• 대한교통학회지
• /
• 제18권3호
• /
• pp.7-16
• /
• 2000

도시 근로자들의 높은 승용차 이용율과 낮은 재차인원율으로 인해 대도시에서의 교통혼잡이 가중됨에 따라 중앙정부 및 지자체에서는 적극적인 도시 교통수요관리 정책을 시행할 계획이며 이에 따라 다양한 교통수요관리 정책을 어디에 어떻게 적용해야 하는가에 대한 관심이높아지고 있다. 본 연구는 미국 텍사스 주 근로자의 통행특성 변화를 분석하여 도시규모, 직장위치, 그리고 직업종류 변화에 따른 낮은 재차인원율과 높은 승용차 이용율을 나타내는 직장 소재지 및 직업종류를 도출하였다. 연구 결과 대도시에서는 도시 및 도시주변 직장 근로자들이 낮은 재차인원율을 나타냈으며 중도시에서는 도심 및 도심주변 근로자들이 낮은 재차인원율을 나타냈고 소도시에서는 도시 및 도시주변 근로자들이 낮은 재차인원율을 나타냈다. 서비스업 근로자는 모든 도시규모에서 낮은 재차인원율을 나타냈다. 한편 승용차 이용율은 대도시 서비스업 근로자들이 높은 승용차 이용율을 나타냈으며 소도시의 도심과 도심주변 소재 직장 근로자와 기본업 근로자들이 높은 승용차 이용율을 나타냈다.

• 품질경영학회지
• /
• 제40권4호
• /
• pp.599-614
• /
• 2012

Purpose: We measure service quality based on service process, and examine relationships among product quality, product and service loyalty. Methods: We develop a construct to evaluate process based service quality. We collect data from customers of auto maintenance centers to measure perceived product quality, service and product quality. We test relationships between constructs using structural equation model and regression analysis. Results: Relationships among perceived-product quality, service quality, service loyalty, and product loyalty are all significant. Conclusion: Perceived-product quality has a indirect impact through service quality and loyalty in addition to a direct impact on product loyalty.

• 대한전기학회:학술대회논문집
• /
• 대한전기학회 2005년도 학술대회 논문집 정보 및 제어부문
• /
• pp.545-547
• /
• 2005

As information technology has been developed rapidly, there is growing online medicine service through forming as information technology and medicine information are amalgamated in the medical service field. That acquires real time biological information of patient through a communication network which could be applied into e-healthcare system for a diagnosis and treatment of patient. Because of these reasons, it is necessary for the e-healthcare system to develop. But,the facilities existing in the medical service field could not be used to an on line environment because of the limitation of the time and space. To solve the point of such issue, we propose an auto color analysis system that is a precise and quick to measure health states of user, and the device has the important merit that it is very low cost. Also, the hospital web database and the monitering webpage for a diagnosis have been made for an e-healthcare system.

• 자동차안전학회지
• /
• 제14권3호
• /
• pp.48-59
• /
• 2022

A V2X system can be a candidate as a means to increase the stability of autonomous vehicles. In particular, in order to implement a Level 4 or higher autonomous driving system, the application of the V2X system is essential. Wireless communication technologies applicable to the V2X system include WAVE and C-V2X. Currently, the V2X service most used by autonomous driving systems is a service that provides signal phase and timing information and since real-time characteristic is a very important, verification of this service must be done. In this paper, we measured the time delay characteristics for providing signal phase and timing information using WAVE and LTE communication, and proposed a TOD-based signal phase and timing information generation method without using V2X communication system. To analyze the time delay characteristics, RTT (Round Trip Time) was measured as a result of the measurement. Average RTT using WAVE communication was 5.84ms and was 104.15ms with LTE communication. As a result of measuring the error between the signal phase and timing information generated based on TOD and the actual traffic light state, it was measured to be -0.284~3.784sec.