• Proceedings of the KSR Conference
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• 2008.11b
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• pp.1327-1332
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• 2008

Nowadays, the technology development of communication and system engineering should impact on the Train Control System(TCS). The one of main developments in TCS is the Communication Based Train Control(CBTC), which does not depend on the track circuit. Currently, there are the project to modernize TCS as CBTC system from the track circuit system around the world. In Korea, there are the new CBTC system revenue projects such as Busan-Gimhae LRT, Sin-Bundang Line, and so on. There is also Government project called Maglev Line in Daejeon, which is applied CBTC system. Through the examples of world TCS renovation, it is expected to modernize the track circuit TCS system as CBTC system in Korea. Therefore, we would express the advantage of developing from the traditional TCS system to CBTC TCS system.

• Proceedings of the KIEE Conference
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• 2011.07a
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• pp.2206-2207
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• 2011

컴퓨터 통신기술 발달에 따라 철도의 열차제어에 대한 기술도 기존의 궤도회로기반에서 무선통신기반으로 변화되고 있다. 국내에서도 도시철도용 무선통신기반 열차제어시스템의 개발이 진행됨에 따른 개발품의 성능평가에 대한 관심이 높아지고 있다. 따라서 본 논문에서는 새롭게 개발되는 무선통신기반 열차제어시스템의 성능평가를 위해 성능시험 항목의 선정과 현장에서의 시험을 위한 시험선로 지상 및 차상인프라 구축에 대한 기본적인 검토를 기반으로 시험 및 성능평가 시행의 종합기본계획을 수립하는 검토를 수행하였다.

• Proceedings of the KIEE Conference
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• 2003.04a
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• pp.418-419
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• 2003

종래의 케도회로를 사용하지 않는 무선통신기반의 이동폐색방식 열차제어시스템에서는, 궤도회로에 의한 폐색구간를 기반으로 하는 종래의 연동제어논리를 더 이상 사용할 수 없게 된다. 이와 같이 궤도회로를 사용하지 않고 역구내에서의 진로제어를 수행하기 위한 연동논리를 구축하기 위하여, 역구내에서, 장내 및 불발과 분기기 구간 위치에서 가상 섹션을 두어서 열차의 진입 유무를 고정폐색방식으로 치환하고, 진로관리와 연쇄, 선로전환기 제어와 쇄정, 신호제어등의 연동논리를 구축하는 방안을 제시하였다.

• Journal of the Korean Society for Railway
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• v.16 no.4
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• pp.262-271
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• 2013

Wireless communication networks are recently taking an important role in railroad systems as railways now require high speed and high density operation with the aid of advanced information technology to improve maintenance efficiency and to handle passenger service growth. Train control systems are consequently changing from track circuitbased systems to communication-based systems. This paper analyses the role of wireless communication networks in recent railroad systems, reviews foreign cases, and then suggests a communication network constructing policy for increased transport capacity increase, securement of safety, and efficient train control.

• Journal of the Korea Academia-Industrial cooperation Society
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• v.16 no.9
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• pp.6214-6220
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• 2015

A track circuit has used stably more than 100 years for detecting train position, but solution of track circuit sort circuit incapacity due to a rust is necessary for side line in station yard, coast line and level crossing for conventional line in rural line. Domestically, Axle Counter System(ACS) has partially used for Hot Box System for high speed line and turnout for CBTC system. In contrast, most of countries has used ACS not only trunk line but also rural line and its application has increased for metro, electric car and industrial railway. In this paper, we has verified the operating status of ACS which installed with existing track circuit through log analsis to implement pilot application in mail track and turnout in station yard. And interface test with interlocking system has conducted at Obong shunting yard, as well as Cheongju station and has analyzed test result. Based on a test result, we made fail safe design, manufacturing skill and established system requirement specification for the smooth operation and maintenance.

• The Journal of Korean Institute of Communications and Information Sciences
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• v.39C no.3
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• pp.291-297
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• 2014

Due to the rapid increase in demand for transportation of human and freight in modern railway systems, the CBTC system has been proposed, which is the solution for improvement of the line capacity that has been limited by the conventional track circuit based train control system. In the CBTC system, higher reliability of the communication system should be guaranteed for the safety of passengers and trains. However, due to the inherent characteristics of the wireless channel environment, performance degradations are inevitable. The diversity techniques can increase the reliability of data transmission using multiple antennas. In this paper, we investigate the performance of the STBC in the railway channel environment. Rician fading model is used for the viaduct scenarios which take important roles in the railway system. Also, considered is the Doppler effect which is an important factor in the mobile communication system. Simulations are performed to analyze the performance of the STBC in various channel environments. Results show that the performance degradation due to the phase error in viaduct scenarios is independent of the diversity order but is affected by the constellation of the modulation.