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정락교(Jeong Rak-Gyo),신기동(Shin Ki-Dong),정상기(Chung Sang-Gi),조홍식(Cho Hong-Shik) 한국철도학회 2004 한국철도학회 학술발표대회논문집 Vol.- No.-
Accurate and reliable tracking system is essential for the central train control system. There are two systems widely being used. one is the fixed block system which utilizes the track circuit for the detection of train position. the other is the moving block system which has the advantage over the former since it enables shorter radio signal for the train position detection. In this paper a new algorithm is proposed which uses signal’s phase difference of arrival to detect the train position Experimental verification of the algorithm is presented in the paper.
정락교(Jeong Rak-Gyo),정상기(Chung Sang-Gi),조홍식(Cho Hong-Shik) 한국철도학회 2005 한국철도학회 학술발표대회논문집 Vol.- No.-
Accurate and reliable tracking system is essential for the central train control system. There are two systems widely being used. one is the fixed block system which utilizes the track circuit for the detection of train position. the other is the moving block system which has the advantage over the former since it enables shorter radio signal for the train position detection. In this paper a new algorithm is proposed which uses signal"s phase difference of arrival to detect the train position. Experimental verification of the algorithm is presented in the paper.
정락교(Jeong Rak-Gyo),정상기(Jeong Sang-Gi),김연수(Kim Yeon-Soo),이정선(Lee Jeong-Sun) 한국철도학회 2005 한국철도학회 학술발표대회논문집 Vol.- No.-
Light Rail Transit(LRT) Systems with transport capacity between subway and bus(5,000-25,000 persons per hour) are being carried on over 100 lines around the world. In Korea, to solve the urban transportation problem, the introduction of LRT system has been proceeded positively. It is planned to develop the Korean standard LRT system in which safety, efficiency and cost effectiveness are emphasized. So we were able to make proto type of Rubber tired AGT system for LRT. This is capable of driverless operation using CBTC(Communication Based Train Control) of Moving Block System and is currently making an experiment for reliability in test-line. This study is focused on verifving the train tracking with CBTC in driverless and ATO mode through implementing the examination.
정락교(Jeong Rak-Gyo),정상기(Chung Sang-Gi),윤용기(Yoon Yong-Ki) 한국철도학회 2006 한국철도학회 학술발표대회논문집 Vol.- No.-
Light Rail Transit(LRT) Systems with transport capacity between subway and bus(5,000-25,000 persons per hour) are being carried on over 100 lines around the world. In Korea, to solve the urban transportation problem, the introduction of LRT system has been proceeded positively. It is planned to develop the Korean standard LRT system in which safety, efficiency and cost effectiveness are emphasized. So we were able to make proto type of Rubber tired AGT system for LRT. This study is focused on verifving the train tracking with CBTC System the measurement of transmitter signal level through the examination.
객체지향모델를 이용한 경량전철 시스템의 성능 시뮬레이션
정상기,정락교,한석윤,Jeong, Sang-Gi,Jeong, Rak-Gyo,Han, Seok-Yun 한국시스템엔지니어링협회 2004 시스템엔지니어링워크숍 Vol.4 No.-
Most rail system related simulations currently used are designed to simulate only one discipline system. This obviously assunes the other discipline system are running regularly not being affected by the system being simulated. In this paper a multi discipline simulator is proposed and its design concept is presented.A multi discipline simulator is the simultor in which major subsystems with different technical discipline are simulated simultaneously. The advantage of the simulator is in that it makes it possible to analyze the systems behavior while other discipline system vary. With this we can identify the possible to analyze the systems ehavior find their solutions. A proto type simulator has bee developed using object oriented programming. Object concept was judged best suitable to model the various multi-discipline self-controlling railway subsystems. It was applied to the target system, which is under development by the Korea Railroad Research institute. The test results show it is very useful in design verification. It could also be a good tool in research and development work to make to improe the system.
조현정(Hyun-jeong Jo),황종규(Jong-gyu Hwang),정락교(Rak-gyo Jeong) 대한전기학회 2009 대한전기학회 학술대회 논문집 Vol.2009 No.4
Safety-critical systems related to the railway communications are currently undergoing changes. Mechanical and electro-mechanical devices are being replaced by programmable electronics that are often controlled remotely via communication networks. Therefore designers and operators now not only have to contend with component failures and user errors, but also with the possibility that malicious entities are seeking to disrupt the services provided by theirs systems. This paper discusses the safety strategies employed in the railway communications and proposes a security mechanism for Korean railway communication system.