• 한국전기전자재료학회:학술대회논문집
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• 한국전기전자재료학회 2007년도 추계학술대회 논문집
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• pp.500-501
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• 2007

Automation systems for higher performance and efficiency in railway electrification systems are driving ever more demanding needs for new condition monitering systems which can consist of sensors connected to the substation and catenary systems. This paper reviews the recently developed condition monitering system, based on a IP network-based multi-agent system, wireless communications and sensor networks for railway electrification system. A new concept for information management, condition monitoring and control of power transmission are considered as railway automation in electrification system.

• 시스템엔지니어링학술지
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• 제16권2호
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• pp.141-147
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• 2020

Due to the nature of the long-term project of a Railway business, Many problems have been arisen in the process of delivering products or systems verified by suppliers to the customer's operation site. Unexpectedly, it is often necessary for the verified products to store intermediately at the supplier's site for a variety of reasons, such as delays in business and delays in civil engineering, at the time of sending them to the customer's operation site. In this study, the intermediate storage process for finding and solving problems related to intermediate storage was presented focusing on the Rolling Stock of Railway System by reference to ISO/IEC/IEEE 15288:2015. A suitable intermediate storage process based on the developed product or system's characteristics will allow the verified products or systems to be placed on the customer's operation site and to meet the customer's product or system requirements.

• 한국철도학회:학술대회논문집
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• 한국철도학회 2004년도 추계학술대회 논문집
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• pp.1618-1623
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• 2004

A holistic approach is needed in railway network modernization. What matters is that each route is developed optimally throughout its life to meet business needs - whether the answer at a given point in time is a rail repair or an redevelopment scheme. Modernization of railway network will bring railway systems up-to-date, enabling them to deliver optimal performance. As the result, the railway network modernization for revitalise the railway is based on seeking out optimum conditions for financially efficient infrastructure management, developing infrastructure fully in line with market needs and last but not least, improving railway business.

• 한국철도학회논문집
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• 제15권4호
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• pp.394-401
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• 2012

철도는 육상수송수단으로서 18세기부터 사용되고 왔는데, 근대적 개념의 철도는 증기기관의 이용이 그 정의로 사용되며, 영국 북서부에서 Stockton & Darlington Railway가 증기기관차 운행을 개시한 것이 그 효시가 되었다. 체계화된 운행시스템을 가진 증기기관차 운행 전용철도로서는 영국의 Manchester & Liverpool Railway가 시작이다. 이러한 역사를 가진 철도는 각국에서 여러 가지 모양으로 발전되었고 시간이 지남에 따라 보존되고 있다. 특히 철도를 최초로 운영한 영국은 다양한 형태의 철도문화유산 보존체계를 가지고 있다. 또한, 아시아에서는 철도분야에서 가장 빠른 발전과 민영화 경험을 가진 일본도 체계적인 철도문화유산보존 시스템을 구축하고 있다. 본 연구에서는 영국과 일본의 양국 철도문화유산제도와 사례비교를 통해 우리나라에 주는 시사점을 살펴보고자 한다. 본 논문의 연구방법은 비교연구의 방식을 채택하였는데, 양국이 가진 법과 제도 및 운영사례 비교분석을 통해 비교와 시사점을 도출하는 방식으로 전개하였다.

• International Journal of Railway
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• 제2권3호
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• pp.99-106
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• 2009

Checks and tests before putting safety facilities into service as well as the results of these tests are essential, time consuming and may show great variations between each other. Economic constraints and the increasing complexity associated with the development of computerized tools tend to limit the capacity of the classic approval process (manual or automatic). A reduction of the validation cover rate could result in practice. This is not compatible with the French national plan to renew the interlocking systems of the national network. The method and the tool presented in this paper makes it possible to formally validate new computerized systems or evolutions of existing French interlocking systems with real-time functional interpreted Petri nets. The aim of our project is to provide SNCF with a method for the formal validation of French interlocking systems. A formal proof method by assertion, which is applicable to industrial automation equipment such as interlocking systems, and which covers equally the specification and its real software implementation, is presented in this paper. With the proposed method we completely verify that the system follows all safety properties at all times and does not show superfluous conditions: it replaces all the indoor checks (not the outdoor checks). The advantages expected are a significant reduction of testing time and of the related costs, an increase of the test coverage rate, an answer to the new demand of railway infrastructure maintenance engineering to modify and validate computerized interlocking systems. Formal methods mastery by infrastructure engineers are surely a key to prove that more safety is not necessarily more expensive.

• Journal of Information Processing Systems
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• 제19권1호
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• pp.46-54
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• 2023

To improve the railway transportation capacity and maximize the benefits of railway transportation, a method for layout optimization of railway transportation route based on deep convolution neural network is proposed in this study. Considering the transportation cost of railway transportation and other factors, the layout model of railway transportation route is constructed. Based on improved ant colony algorithm, the layout model of railway transportation route was optimized, and multiple candidate railway transportation routes were output. Taking into account external information such as regional information, weather conditions and actual information of railway transportation routes, optimization of the candidate railway transportation routes obtained by the improved ant colony algorithm was performed based on deep convolution neural network, and the optimal railway transportation routes were output, and finally layout optimization of railway transportation routes was realized. The experimental results show that the proposed method can obtain the optimal railway transportation route, the shortest transportation length, and the least transportation time, maximizing the interests of railway transportation enterprises.

• 한국철도학회논문집
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• 제20권2호
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• pp.210-222
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• 2017

철도의 분기기 시스템은 철도에서 가장 중요한 시스템 중 하나로서, 차량의 진로를 설정한다. 분기기 시스템은 철도에서 가장 취약한 시스템 중 하나이며, 건전성을 유지하기 위해서 지속적인 관리가 필요하다. 분기기 진단 시스템은 분기기의 열화 상태를 자동적으로 측정할 수 있다. 분기기 시스템을 진단하기 위해서, 기존의 분기기 점검절차와 분기기에서 나타나는 물리적 특성을 규명하였다. 도출된 측정항목을 이용하여, 적절한 센서들을 선정하고, 영업노선에 설치하여, 데이터를 수집하였다. 본 논문에서는 분기기와 같이 열악한 환경에서 센서의 강건성과 데이터 획득에 대한 잡음 간섭 여부를 판단하였다.

• Structural Engineering and Mechanics
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• 제83권6호
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• pp.709-727
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• 2022

Fastening systems have a significant role in the response of railway slab track systems. Although experimental tests indicate nonlinear behavior of fastening systems, they have been simulated as a linear spring-dashpot element in the available literature. In this paper, the influence of the nonlinear behavior of fastening systems on the slab track response was investigated. In this regard, a nonlinear model of vehicle/slab track interaction, including two commonly used fastening systems (i.e., RFFS and RWFS), was developed. The time history of excitation frequency of the fastening system was derived using the short time Fourier transform. The model was validated, using the results of a comprehensive field test carried out in this study. The frequency response of the track was studied to evaluate the effect of excitation frequency on the railway track response. The results obtained from the model were compared with those of the conventional linear model of vehicle/slab track interaction. The effects of vehicle speed, axle load, pad stiffness, fastening preload on the difference between the outputs obtained from the linear and nonlinear models were investigated through a parametric study. It was shown that the difference between the results obtained from linear and nonlinear models is up to 38 and 18 percent for RWFS and RFFS, respectively. Based on the outcomes obtained, a nonlinear to linear correction factor as a function of vehicle speed, vehicle axle load, pad stiffness and preload was derived. It was shown that consideration of the correction factor compensates the errors caused by the assumption of linear behavior for the fastening systems in the currently used vehicle track interaction models.

• 한국철도학회:학술대회논문집
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• 한국철도학회 2011년도 춘계학술대회 논문집
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• pp.1556-1562
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• 2011

Recently many disadvantageous problems have been found during the process of domestic LRT(Light Rail Transit) projects and that can influence negative effects on the development of domestic railway. Since many projects have been progressed while having few original technologies, it is no exaggeration to say that they are being built unreasonable railway which lacks economic feasibility. The on-going LRT projects which are being carried out by the central or local government have a tendency to favor the systems and rolling stocks that have been approved by other countries through years of experience, therefore it can be said that we are having few chances to develop original technologies. In this study, we would like to promote railway development and jump up to the level of advanced railway standards through developing our unique and independent future LRT technology.

• 전기학회논문지
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• 제62권8호
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• pp.1169-1176
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• 2013

PES have been recently required to implement railway industry for its application flexibility. The PES should be commensurated with railway safety requirements. It achieved its safety through redundant PES. The redundant systems run with voting functions. The successful major voting result becomes the output of the redundant system. The redundant system have to be synchronized to vote each output results. This paper proposed an algorithm for synchronizing and a voter. The proposed algorithm and the voter are verified using simulation.