• 전기학회논문지P
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• 제58권2호
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• pp.108-115
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• 2009

Recent advances in computer technology have brought more dependence on software to train control systems. Hence, the safety assurance of the vital software running on the railway system is very critical task and yet, not many works have been done. While much efforts have been reported to improve electronic hardware's safety, not so much systematic approaches to evaluate software's safety, especially for the vital software running on board train controllers. In this paper, we have developed the static software testing tool for railway signaling, especially Fagan Inspection module and checklists supporting module. This static testing tool for railway signaling can be utilized at the assessment phase, and also usefully at the software development stage also. It is anticipated that it will be greatly helpful for the evaluation on the software for railway signalling system.

• 한국철도학회:학술대회논문집
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• 한국철도학회 2003년도 춘계학술대회 논문집
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• pp.511-516
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• 2003

It is very important to ensure system safety during the process of developing a system. Railway system is also devoting a great portion for the safety. Nowadays many countries leading railway industry have their own system assessment principles according to the situation of their train control systems. In this paper, several principles to derive Safety Integrity Level are represented in the railway signalling system. The characteristics of those principles are also considered respectively.

• 대한전기학회:학술대회논문집
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• 대한전기학회 2002년도 하계학술대회 논문집 B
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• pp.1205-1207
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• 2002

As going through technical transition of signal control logic to mechanic, electric, electronic etc., railway signalling system utilizing computer control technology has recently been developed and used since railroad service had been firstly started in 1825 by beginning that horseman kept red color sign and notified something wrong existence and nonexistence of front route to train driver in the Britain. In this paper, the domestic technical change process of signalling technology to be a basic of train control technology is discussed and then reviewed about technical trend of advanced nation's development.

• 대한전기학회:학술대회논문집
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• 대한전기학회 2000년도 하계학술대회 논문집 B
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• pp.1387-1389
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• 2000

Railway signalling system is required to be high safety against collision, derailment and collision at level crossing and to be high availability. The signalling system is usually divided into automatic train control, interlocking and centralized traffic control systems and each system must be high fail safe and availability. This study focused on reliability calculation of vital systems in train control system.

• 한국철도학회:학술대회논문집
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• 한국철도학회 2002년도 추계학술대회 논문집(I)
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• pp.453-458
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• 2002

East Japan Railway Company developed an digital ATC signalling system instead of conventional ATC system and now is making progress the construction tokyo area Keihin-Tohoku Line between Minamiurawa and Tsurumi. But replacing into new system with existing ATC system in operation should be performed without affecting current running system and the technology that makes it possible for current system and new system to coexist, initialization of system, preparation for an emergency should be organized not to affect overall system. Controlling method of digital ATC signalling system and "assurance technique" for solving the problems when replacing will be mentioned in this paper.

• 한국철도학회:학술대회논문집
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• 한국철도학회 2000년도 춘계학술대회 논문집
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• pp.376-381
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• 2000

Because of the presure of costs some public transport companies are forced to think new system that is more simple and more economic forms of operation. Radio-based operation and automatic driverless operation for city railways are possible to low the costs. To construct the automated driverless operation system, it is necessary to configure the new signalling. This paper focuses on the automated driverless operation system suitable for the LRT and the standard of signalling function and the R＆D project in the world.

• 한국철도학회:학술대회논문집
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• 한국철도학회 2010년도 춘계학술대회 논문집
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• pp.1081-1099
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• 2010

The TVM 430 system manufactured by Ansaldo STS in France is currently used in ground signalling system for Kyungbu HSR. It transmits the speed information to the on-board signalling system in the form of continuous signal via the track, and the rolling stock in Kyungbu HSR runs with 300km/h max. operating speed by using the corresponding information. Looking from the recent international trends in HSR, reducing the travelling time and increasing of the line capacity is promoting via the improvement of train speed. In case of TGV Est, they are realizing the normal operation with 320km/h max. operating speed by using TVM SEI signalling system, which is similar to TVM 430. Furthermore, in case Honam HSL, which is under construction, is looking over faster speed than the limited one of Kyungbu HSR(i.e. over 300km/h). In this paper, it is assumed that the existing TVM 430 ground signalling system is used and train speed is improved, therefore the number of block section to be increased depending on the increase of train speed and the standard speed to be used in this case is drawn via the simulation of the train model and described the method accordingly.

• 한국철도학회:학술대회논문집
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• 한국철도학회 2011년도 정기총회 및 추계학술대회 논문집
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• pp.2782-2786
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• 2011

In this paper a protocol design for bus network communication between onboard signalling system and MMI(Man Machine Interface) will be presented and illustrated. Recently, many onboard signailling systems adopt hot standby for safety reasons. Hot standby is a method of redundancy in which the primary and secondary systems run simultaneously. It is convenient to use bus network(bus topology) in a hot standby system for communication between onboard signalling system and MMI. Because bus network is the simplest way to connect multiple clients such as onboard signalling system, MMI and etc. However, there are many problems when two clients want to transmit at the same time on the same bus. A effective protocol is necessary to solve that problems. We will describes protocol design which is useful when onboard signalling systems and MMIs are connected via RS485(Bus Network).

• 한국철도학회:학술대회논문집
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• 한국철도학회 2007년도 춘계학술대회 논문집
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• pp.1722-1728
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• 2007

This study analysed testing method for performance verification in the phase of signalling system development for application in the Light Rail Transit(LRT). The main focus in this study therefore includes development of vehicle location detection system by first GPS and analysis of performance verification method by field testing. The comprehensive testing method has been analysed for the signalling system for LRT high speed operation. The signalling system for LRT high speed operation deals with vehicle location identification through vehicle location information using the second GPS and decision for whether the high speed proceed signal and departure inhibition output is feasible or not and for signalling output to the corresponding vehicle.

• 한국철도학회논문집
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• 제12권4호
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• pp.535-541
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• 2009

전자부품으로 구성된 제어기의 선뢰성에 대한 연구는 미국방부를 중심으로 1960년대부터 연구되었으며, 철도분야에서는 유럽을 중심으로 1990년대부터 연구되었다. 특히 한국에서는 2000년대 이후부터 신호설비 신뢰성에 대한 연구가 시작되어 과거 신뢰성정보가 없는 노후신호설비를 대상으로 하는 효율적인 유지보수를 위한 신뢰도 평가가 요구되고 있다. 본 논문에서는 부품단위 고장률 또는 운영시 발생된 고장정보와 같이 신호장치의 신뢰성이 지속적으로 감시 및 분석되지 않고 25년 이상 사용된, 노후신호장치를 대상으로 부품단위 신뢰도를 평가하고, 잔존수명함수를 사용하여 현재시점에서의 신뢰도변화를 예측하였으며, 연장사용이 요구되는 기간에 대한 가속스트레스시험을 통해 연장사용의 가능성을 평가하는 모델을 개발하였다. 개발된 모델은 노후신호설비를 운영하는 철도운영기관이 미래의 유지보수정책을 수립하기 위해 활용될 것이다.