• Journal of the Korean Society for Railway
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• v.12 no.2
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• pp.291-301
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• 2009

This paper presents the optimal design and analysis method of the train overhaul maintenance facility based on the simulation. Because the train is composed of a coach or more, we design the simulation model after analyzing the operation of train into train, coach, coach's body parts and wheel parts and soon. In simulation analysis, we consider the critical (dependent) factors and design (independent) parameters for the selection of alternatives and optimal design. Therefore, Multi Criteria Decision Making (MCDM) is proposed for the selection of alternatives and optimal method in order to find the optimal design factors. The case study for the above approach is used for the electronic locomotive overhaul maintenance facility. This paper provides a comprehensive framework for the train overhaul maintenance facility design using the simulation, MCDM and optimal methods. Therefore, the method developed for this research can be adopted for other enhancements in different but comparable situation.

• Journal of the Korea Academia-Industrial cooperation Society
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• v.11 no.8
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• pp.2809-2817
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• 2010

The scholarly concern of train industry has been improved, since country focuses on this field. Especially, train maintenance facility has been studied for construction, because the facility is important to inspect the train that transports passenger and cargo. Various operation plans and criteria are considered to build train maintenance facility. In this paper, the decision making of train maintenance facility for construction is studied and analyzed with simulation, because mathematical theory is restricted to consider various operation plans and criteria. Through simulation, we analyze warm-up after selecting dependent factors, and extract data. The data is used to select a alternative in this problem, Multiple Attribute Decision Making(MADM). Previous study is difficult, complex and subjective for decision making. However, entropy measurement we used help decision maker for decision making, easily, simply, and objectively. This method can have decision maker choose the best alternative in case the train maintenance facility construction is fast revitalized.

• KSCE Journal of Civil and Environmental Engineering Research
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• v.36 no.1
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• pp.121-128
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• 2016

The restructuring of Korean railway industry, separation of between train operators and an infrastructure manager, had been conducted in 2004 to increase the productivities of railway operations. However, the maintenance-staffs are still employed by Korail (train operator), not by the infrastructure manager, which led the maintenance of railway infrastructure to be conducted by the train operator. The infrastructure manager is now only taking care of financial transferring issues once the train operator requests expenses spent for facility maintenance. Such incomplete restructure may result in a lack of safety performance on railway operations as the roles and responsibilities are less likely to be assigned under the multiple train operators. Thus, this study proposes the way of structuring maintenance divisions and their roles and responsibilities to assure the safe work execution under the circumstance of multiple train operators on the same rail network.

• Journal of the Korean Society for Railway
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• v.13 no.2
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• pp.222-228
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• 2010

In this paper, we propose a optimization approach for the Electric Locomotive Overhaul Maintenance Facility (ELOMF), which aims at the simulation optimization so as to meet the design specification. In simulation design, we consider the critical path and sensitivity analysis of the critical (dependent) factors and the design (independent) parameters for the parameter selection and reduction of the metamodel. Therefore, we construct the multi-objective non-linear programming. The objective function is normalized for the generalization of design parameter while the constraints are composed of the simulation-based regression metamodel for the critical factors and design factor's domain. Then the effective solution procedure based on the pareto optimal solution set is proposed. This approach provides a comprehensive approach for the optimization of Train Overhaul Maintenance Facility(TOMF)'s design parameters using the simulation and metamoels.

• Proceedings of the KSR Conference
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• 2004.10a
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• pp.1291-1296
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• 2004

CBTC(Communication Based Train Control) System has many superior train control performances than conventional track-circuit-based train control system with higher train operation efficiency, and less installation and maintenance cost. It is expected that CBTC will replace the conventional train control systems in near future. As CBTC has different mechanisms from conventional track-circuit-based train control systems in identifying train positions, and communicating information between train and ground facility, we have to pay a carful attention to making the interface between CBTC equipments and other signalling devices. This paper provides the construction of the interface between CBTC train-born equipment and other train control equipments including ATO, TCMS, brake controller, door controller.

• Proceedings of the KSR Conference
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• 2004.10a
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• pp.1297-1302
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• 2004

CBTC(Communication Based Train Control) System has many superior train control performances than conventional track-circuit-based train control system with higher train operation efficiency, and less installation and maintenance cost. It is expected that CBTC will replace the conventional train control systems in near future. As CBTC has different mechanisms from conventional track-circuit-based train control systems in identifying train positions, and communicating information between train and ground facility, we have to pay a earful attention to making the interface between CBTC equipments and other signalling devices. This paper provides the construction of the interface between CBTC equipment and other signalling equipments such as TTC(Total traffic Control) system. ATO. electronic interlocking devices.

• Proceedings of the KSR Conference
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• 2008.06a
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• pp.243-248
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• 2008

Seoul subway is an safety, quick, and clean public transportation to secure citizens safety. One of the most important elements of train is optimizing railroad function and need to conform railroad inspection for function maintenance. Railroad is the most biggest part of the railroad facility and it is a structure which requires sustainable maintenance. The purpose of study is to improve domestic metropolitan railroad facility inspection method and period. For this, we refer documents about present roving method, roving members and period of railroad roving. In addition, analyzed problems of railroad roving investigation method and period by examining the type and standards of railroad investigation and interviewing experts. By this, we analyzed improving plan and expectations of railroad maintenance and repair operation.

• Proceedings of the KSR Conference
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• 2004.06a
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• pp.583-588
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• 2004

Opening commercial service of KTX at the time of demanding more flexible train set for HONAM line and JEONLA line, it's necessary for the Korean High speed train, performing the stabilization; to modify the design in aspect of passenger and maintenance. In order to ensure the optimized interior design in Korean High speed train, it is necessary to review the major items such as disabled passenger facility, toilet, seat arrangement, compartment partition and door, access door, electrical cabinet, color and paint through the European standard and compare with other high speed train.

• Journal of the Korean Society of Safety
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• v.25 no.1
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• pp.87-92
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• 2010

Urban transit system must secure fast, safe and reliable transportation capacity as a metropolitan mass transit. For this purpose, it is important to make all the sub-systems (which consist of EMU, power feeding, signaling & telecommunication, railway, platform facility, and control system and so on) work well. To operate all the systems effectively and reliably, a maintenance measure optimal to each system's characteristics is needed to be established and executed. So, highly reliable maintenance should be performed. But, EMU maintenance methods suitable to its own model and EMU lines are not yet introduced. This study examined few examples mainly to secure reliability on a maintenance quality in operating method and the features of train maintenance system based on travel distance.

• The Transactions of the Korean Institute of Electrical Engineers P
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• v.59 no.4
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• pp.384-389
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• 2010

Workers maintaining at the railroad trackside may collide with the train since they cannot recognize the train approaching because of the sensory block phenomenon occurred due to their long hours of continued monotonous maintenance work. To reduce these casualty accidents of maintenance workers working at the trackside of railroad, we developed the wireless communication-based safety equipment for preventing accidents. The motor-cars for maintaining trackside facility have unique operational patterns suitable for urban environment. The several mechanism for developed safety equipment are represented in this paper.