• Proceedings of the KSR Conference
• /
• 2011.10a
• /
• pp.2782-2786
• /
• 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).

• Proceedings of the KSR Conference
• /
• 2007.05a
• /
• pp.1722-1728
• /
• 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.

• Proceedings of the KSR Conference
• /
• 2010.06a
• /
• pp.1081-1099
• /
• 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.

• Proceedings of the KSR Conference
• /
• 2008.11b
• /
• pp.1113-1125
• /
• 2008

In this paper we present a RAMS to be applied to the development of the Urban Maglev Train Signalling System. The RAMS that can be applied to the life cycle of a Signalling system, from the basic design to the dismantlement, shows the whole process of the paper work in detail through the establishment of a goal, analysis and assessment, the verification. In this paper we study about the making a plan, the preliminary hazard analysis, the hazard identification and analysis to guarantee the safety of the Signalling System. The process for the verification of the system safety is divided into several steps based on the target system and the approaching method. The guarantee of the system safety and the improvement of the system reliability is followed by the recommendation of the international standards.

• Proceedings of the KSR Conference
• /
• 2011.10a
• /
• pp.232-238
• /
• 2011

Hazard analysis provides the basic foundation for system safety. Hazard analysis is performed to identify hazards, hazard effects, and hazard causal factors. Hazard analysis is used to determine system risk, to determine the significance of hazards, and to establish design measures that will eliminate or mitigate the identified hazards. Hazard analysis is used to systematically examine systems, subsystems, facilities, components, software, personnel, and their interrelationships, with consideration given to logistics, training, maintenance, test, modification, and operational environments. This paper present hazard analysis techniques which is commonly used in railway signalling, comparised their benefits and limitations.

• Journal of the Korea Academia-Industrial cooperation Society
• /
• v.11 no.2
• /
• pp.469-475
• /
• 2010

The railway signalling system plays an essential role in the safe and efficient train operation as serving control functions of train operation intervals and train routes. The reliability and safety of the system are very important because the failure of the railway signalling system can lead to train collision or derailment as well as train operation stop. Until now, in railway signalling system the conventional wayside signal mode has been used generally. There are, however, the risk of accidents such as human mistakes caused by that the driver identifies the signal lamp status and controls train speed with the naked eye. It is also necessary to refurbish the obsolete system. Thereby, It is being effective that the onboard signal mode has been recently introduced and applied in order to transmit the speed control information to train by using the computer and communication equipment. It is necessary to switch over the system in a way while providing passengers with an operation service to replace the obsolete signal system. In this paper, we verify the cases through trial assessment which are solved by the way of adding specific functionalities in the problems of interference among the procedure of switch-over processes and a serial of processes for system verification while a train is operated in the new system in parallel to the existing system.

• Proceedings of the KSR Conference
• /
• 2005.11a
• /
• pp.976-981
• /
• 2005

The Seoul subway line No.2 is the one of the busiest metro service line of the passenger transportation in Seoul metropolitan city. The number of the passengers served by the Seoul subway line No.2 is more than 1.9 million in a day according to the transportation reference of 2004, which is about $15\%$ of the whole population in Seoul metropolitan city. This is the reason why the Seoul Metropolitan Subway Corporation(SMSC) is implementing the refurbishment of the current ATS signalling system of Seoul Line No.2 into the most advanced ATO system with the continuous air-gap telegram transmission through the track circuit without any suspension of the train service either in when or in where, which is the first in the world in its attempt to refurbish the old signalling system under service without any suspension of the train operation.

• Proceedings of the KSR Conference
• /
• 2011.10a
• /
• pp.204-210
• /
• 2011

This paper present investigation of interoperable process and interaction-facts between urban and new ATS signalling system for degrading, improvement or replacement in wireless communication-based train control system of urban driverless transit, and investigate interoperable requirement from joint program of cooperation-"wireless communication-based train control system's standard process construction and performance evaluation on urban transit" of first year result.

• Proceedings of the KSR Conference
• /
• 2008.11b
• /
• pp.1126-1131
• /
• 2008

In this paper we introduce an applicable RCM(Reliability centered maintenance) method for Track circuit equipment of AREX's Signalling System. AREX computerize all the process of FRACAS(Failure Reporting, Analysis and Corrective Action System)) by the Facility Management System of Integrated Information System. These datum were analysed and reproduced as the RAMS index value which can be used by maintenance staff for optimizing the maintenance method of the System.

• Proceedings of the KSR Conference
• /
• 2011.05a
• /
• pp.363-367
• /
• 2011

In this paper a simulator for Integrated Onboard Signalling System(IOSS) will be presented and illustrated. IOSS which is integrated with there signalling systems such as ERTMS/ETCS Level 1 ATP(Automatic Train Protection), ATC(Automatic Train Control) and ATS(Automatic Train Stop) is a signalling system for HEMU-400X(Highspeed Electric Multiple Unit - 400km/h eXperiment). HEMU-400X is under development as the next generation high-speed train in Korea. Before conducting a trial run of HEMU-400X with IOSS, we must carry out functional test of IOSS. The simulator is suggested in this paper for testing and verification of IOSS. The simulator can help to test all function of IOSS although a real train and trackside equipments are not existed. Also the simulator can make a fault in trackside equipment intentionally. In that scenario, we can figure out how IOSS handle emergency situations.