• 한국신뢰성학회지:신뢰성응용연구
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• 제15권4호
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• pp.276-281
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• 2015

Purpose : The purpose of this study is to propose that domestic rail must the work to be done in the RCM system and railway operators are to present a direction to establish the efficient and systematic system based on this. Methods : In recent years, domestic railway accidents has decreased year rapidly every year. In particular, suicidal ideation was greater than 50% of the accidents is showing a larger decrease in the influence of the screen-door construction. However, the train delay has been maintained without major changes since 2010. The most important cause of the delay operation is a vehicle breakdown. This fact demonstrates that effective maintenance of the most important activities in the railway accident prevention activities. So we have to build a RCM system in which the characteristics of the domestic railway accident. Conclusion : We proposed what is necessary functionality and the function requires a railway operators in RCM railway systeml.

• 한국신뢰성학회지:신뢰성응용연구
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• 제10권4호
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• pp.237-250
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• 2010

Railway safety aims to ensure that railways take appropriate action to limit the risk of injury to persons or damage to property, to acceptable levels. Accreditation system specifies railway safety requirements to be included in a railway safety management system by any organization seeking to demonstrate the ability to control the processes that determine the acceptability of railway safety activities. The objective of this research is to investigate the international accreditation system for railway safety management. The yield information is quite valuable to operate collaborative processes with all interfacing transport operators and undertakings to facilitate risk control across the railway system.

• 전기학회논문지
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• 제57권11호
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• pp.1905-1909
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• 2008

As catenary supply electric power directly to the railway system, it is very important to prevent an accident of a catenary for appropriate train operations. This paper analyzed the outage data for British catenary safety analysis report and Korean data to compare the reliability of the railway systems. The analyzed data were applied to Fault Tree Analysis(FTA) algorithm to calculate the reliability indices of a railway system. Failure rate of an electric railway system through FTA were calculated for each element and the entire railway system. The reliability indices can be used to determine the eqipment to be replaced for the entire system reliability improvement.

• 전기학회논문지P
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• 제65권4호
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• pp.242-249
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• 2016

The railway system is being converted to the computer system from the existing mechanical device, and the dependency on software is being increased rapidly. Though the size and degree of complexity of software for railway system are slower than the development speed of hardware, it is expected that the size will be grown bigger gradually and the degree of complexity will be increased also. Accordingly, the validation of reliability and safety of embedded software for railway system was started to become influential as the important issue. Accordingly, various software test and validation activities are highly recommended in the international standards related railway software. In this paper, we presented a software coding analysis tool using symbolic execution for railway system, and presented its result of implementation.

• 한국철도학회:학술대회논문집
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• 한국철도학회 2008년도 춘계학술대회 논문집
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• pp.378-383
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• 2008

One of the main concerns of railway system is to secure safety. Nowadays digital technology has been rapidly applied to safety critical system. The digital system performs more varying and highly complex functions efficiently compared to the existing analog system because software can be flexibly designed and implemented. The flexible design makes it difficult to predict the software failures. For this reason, the safety criteria are suggested to secure the software safety for the field of railway system. Following them, the railway software have to be examined whether it is properly developed according to the safety criteria and certification process. Because the articles suggested in safety criteria are written in legal term, it is difficult to apply the criteria to develop railway software. This paper suggests and discusses a development and assessment procedure to solve these issues for railway software with more detail description.

• International Journal of Railway
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• 제5권4호
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• pp.167-174
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• 2012

As wireless power transfer (WPT) technologies emerge in a wide range of applications including public transportation, many expect that applying the technology to the current railway systems will bring positive effects to current railway systems. In this paper, we introduce design methodology of a WPT system for railway application. Fundamental principles of magnetic fields and a WPT circuit are first analyzed, and advantages and efficiency of a possible train system are discussed. It then examines other significant factors such as performance requirements and EMC criteria to design a wireless train system.

• 한국철도학회:학술대회논문집
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• 한국철도학회 2001년도 춘계학술대회 논문집
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• pp.58-65
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• 2001

Many changes in the railway environment has directly affected to the railway company. To cope immediately with the influence of environment and to promote productivity, the railway company has to introduce an efficient train operation system and related core technologies. The railway system is composed or large-scale infrastructures ann high-cost trains. Simulation method is one or core technologies and also is efficient tool for planning and analyzing this kind of complex system. The purpose of this research is to develop multi-train traffic simulator considering high-speed train for GyongBu-Line. To achieve this objective, the elements of railway system was analyzed, and as a result, a data structure modeling for the railway system such as rail-Tine infrastructure, rain, timetable and operational route is presented. The developed simulator is composed of three major part : input-module, main-module, and output module. The concept and brief explanation of each module will be treated.

• 한국전자통신학회논문지
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• 제11권4호
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• pp.373-378
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• 2016

국내 철도시스템은 2004년 KTX가 도입된 이래 최고의 안전성과 정확성을 유지하고 있다. 이를 뒷받침하기 위하여 철도 무선통신 시스템에 LTE를 도입하게 되었고 이에 대한 표준화가 추진되고 있다. 철도통신시스템은 재난안전통신망과 연계를 통하여 국가안전망의 일부로 활용될 것이며 이들 시스템간의 연동방안은 중요한 기술적 과제이다. 본 논문에서는 철도시스템의 주요 특징을 분석하고 국내에서 추진중인 LTE 기반 철도통신시스템의 개발 현황을 살펴본다. 국내 철도무선통신 체계를 구축에 있어 철도시스템 운영 효율을 높이기 위하여 향후 표준화를 추진하여야 할 내용을 검토한다.

• International Journal of Railway
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• 제9권2호
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• pp.36-40
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• 2016

TETRA communication system is very versatile system which can transmit voice + data and packet data optimized. Direct mode operation permits to connect between mobiles when mobile stain is out of coverage of networks. It can be more secure communication channel for railway signaling systems. Railway signaling systems use many of wayside signal equipment, which require many maintenance efforts and budget. Many railway authorities want to reduce and replace the wayside equipment. Radio based signaling systems are one of candidate for replacing the conventional signaling systems. The radio based signaling systems can replace track circuit and wayside signal. The radio systems permit to connect between control centers and trains. The radio systems have to ensure high quality of the connectivity more or equal to the existed track circuits. We studied the application of TETRA systems for railway radio systems for bridging between train control centers and trains. We provide an operation scenario for radio based train control system to ensure the safety require to the existed trains control system and satisfied the existed operational availability. We showed the data transmission speed, maximum bit error rate, and data coding for the radio-based signal system using TETRA systems.

• 한국철도학회:학술대회논문집
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• 한국철도학회 2007년도 추계학술대회 논문집
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• pp.713-718
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• 2007

This paper is described the System of effective RAMS Management established for AREX Railway System. This system for AREX's E&M system contains FRACAS(Failure Reporting, Analysis and Corrective Action Plan) and computation of RAMS indices. This procedure is applying to improve the Reliability, Availability, Maintainability and Safety for railway system in operation stage. Furthermore, this system would be a basis of RCM(Reliability Centred Maintenance).