• Proceedings of the KSR Conference
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• 2000.11a
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• pp.613-619
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• 2000

This paper presents a mettled to reduce the number of conductors of catenary system for estimating line constants. Conductors of a catenary system are grouped and reduced. For example, the model representing the contact and the messenger conductors with a single equivalent conductor is. probably more realistic than assuming the two conductors completely separated, since they are generally connected by droppers every few meters. Therefore, this paper shows the method to reduce the number of conductors using electric circuit theory. To verify the results, we compared the equivalent line constants obtained by proposed method with those obtained by measurement.

• Proceedings of the KIEE Conference
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• 2002.04a
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• pp.257-259
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• 2002

This study presents a development of DeCatS which is software to design high speed catenary system automatically. This is developed by KRRI with the support of KHSR. This paper presents a process of developing this S/W and a comparison with LEXCAT is demonstrated a preciseness of this.

• Proceedings of the KIEE Conference
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• 2002.04a
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• pp.263-265
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• 2002

This paper presents a design method of database to manage materials having hierarchical structure on Kyungbu high-speed catenary system. Through this method, the automatic management software was developed. The software can get to find out assemblies as well as single fittings used in a section.

• Proceedings of the KIEE Conference
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• 1999.11b
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• pp.300-302
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• 1999

This paper presents an approach to modeling the electrical railway accurately including the autotransformers and mutual impedance. The proposed approach can enhance the capability of analyzing the railway system, and can also be applied to a simulator for extensive stability study.

• Proceedings of the Korean Information Science Society Conference
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• 2001.10c
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• pp.427-429
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• 2001

최근 라우터에서는 정체를 회피하고 전송률을 향상시키기 위한 능동적 큐 관리와 패킷 스케줄링에 대한 많은 논의가 이루어지고 있다. 본 논문은 라우터에서의 전송률 향상을 위한 Random Early Detection (RED) 알고리즘과 최근가지 변형된 RED알고리즘들의 특징을 살펴보고, RED라우터에 적용하여 실제로 종단 호스트(End-to-end)에서 전송 받는 패킷의 양을 창상하기 위한 선별적 처리 알고리즘을 제안한다.

• Proceedings of the KIEE Conference
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• 2001.04a
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• pp.429-432
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• 2001

This study presents an approach to model and to analyse traction power feeding system focused on the amplification of harmonic current. Through the research, 8-port network model which can be effectively applied to harmonic analysis is derived.

• Proceedings of the KSR Conference
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• 1999.05a
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• pp.336-343
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• 1999

This paper presents development of the program which calculates the electric quantities such as current, voltage at each pan of railway electrification system in static state. The purpose of this program is to estimate the adequacy of railway electrification system through simulations. And it contributes the estimations for optimal railway electrification system by calculating the maximum of current and voltage. The results are represented through GUI(Graphic User Interface) for user to understand easily.

• Proceedings of the KSR Conference
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• 2009.05a
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• pp.411-417
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• 2009

This paper describes the development of integrated simulator for traction power supply system with GUI (Graphic User Interface). This simulator consists of a lot of calculation modules such as TPS, time table, line constant, and power supply system analysis. Each module has input and output structure respectively. The proposed simulator is tested on both high speed railway line and metropolitan subway line. The test has confirmed the function of the developed simulator.

• Proceedings of the KSR Conference
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• 2001.05a
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• pp.341-346
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• 2001

This paper presents a concept design of detail design software for high speed catenary system. In this software, M.D.(mounting diagram) can be peformed and parts D/B can be also managed. french one, used in Kyung-bu high-speed line, is not good at user's interface, and the source code is not opened. So, it is impossible to use it in the different environment and catenary system. Through this program, automation of detail design and user's convenience can be derived.

• Proceedings of the KSR Conference
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• 2002.10b
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• pp.989-994
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• 2002

In case the fault occurs in railway high voltage power supply network, protective relaying system must selectively detect 1 wire ground fault of grounding or non-grounding system. And this study presents railway high voltage power supply system model using PSCAD/EMTDC Vet 3.08 for circuit analysis and fault studies. In this paper, we propose protection method of non-grounding system of railway high voltage power supply system. The result shows its usefulness.