• Proceedings of the KSR Conference
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• 2003.10c
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• pp.316-321
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• 2003

The railroad is a means of large transportation which has many talents such as a safety and a regularity. That is a results from various confidential performance tests and evaluations of the system. The railroad system consist of various subsystems - vehicle, power supply, signal, communications, track structures, operations, etc. Among them, as an item of safety evaluation there is a measurement of wheel/rail force, so called a measurement of derailment coefficient. This is a very important item because a derailment of a train will bring about a big accident. Especially it is more important in high speed rail of which operation speed is over two times as fast as existing rail. In this paper, it is introduced to preprocess the wheelset for measuring wheel/rail force of high speed rail, such as to treat a measuring wheelset, adhesion of strain gauges and static load test, running test result of main line.

• International Journal of Railway
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• v.3 no.2
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• pp.46-53
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• 2010

Electric railroad systems consist of rolling stock, track, signal and catenary system. In the catenary system, one of the most important factors is the impedance according to the design and characteristic. Before the catenary system is designed, the impedance should be precedently researched. The railroad catenary system is complex system which is composed by five conductors. The five conductors classify up and down feeders, up and down contact wire group, rail group. Therefore, we should compose the catenary system of the equivalent five-conductors model. In this paper, we suggest a geometrical model and a equivalent conductor model by using geometric mean radius of five conductors in the catenary system. Also, we calculate demanded parameter values in the model. By using those, line constants of five conductors are analyzed by applying the equivalent method called as the condensed joint matrix.

• Journal of the Korean Institute of Illuminating and Electrical Installation Engineers
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• v.26 no.10
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• pp.44-51
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• 2012

The purpose of this study is development of the diagnosis system to preventative maintenance in the on-board measuring systems for in-cab electric inspection systems of high speed railway. The on-board measuring systems can inspect precisely whether ground signal system operate stably. In this paper, we recognize characteristics of the track circuits and confirm whether the wave of current matches the on-board measuring data through the electric modeling method for high speed railway. it is necessary to develop GUI visual programs that can simulate abnormalities of the on-board measuring data in many ways, and the visual program is designed to diagnosis in the case of track circuit equipment's function decreased in advance.

• Proceedings of the KIEE Conference
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• 2003.07b
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• pp.1294-1296
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• 2003

For this research, we developed the hardware and software of the measurement system for on-line test and evaluation. The software controls the hardware of the mesurement data and acts as interface between users and the system hardware. In this paper, we is studied for Aux. Block performance of railway vehicle. In order to this test is developed signal conversion system. Using this system. we obtained important result for battery voltage, Aux. Block temperature.

• Proceedings of the KIEE Conference
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• 2003.07b
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• pp.1297-1299
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• 2003

The Present headway on KNR lines varies from 6 to 10 minutes depending on the each line. Therefore KNR would like to reduce the headway of the all lines by 4 minutes with the implementation of ERTMS/ECTS on-board system. With the operation of HSR lines in 2004 the bottleneck would be expected within a few sections such as Seoul-Siheung which will be the common route between KTX and conventional lines. This study will analyze and compare the optimal headway can be accomplished by the ATS trackside and that of ETRMS/ETCS on-board system within the Seoul-Siheung section.

• Proceedings of the KIEE Conference
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• 2007.07a
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• pp.2082-2083
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• 2007

고속철도 운행, 도시철도 고밀도화, 무인자동운전의 경량전철 등 신교통시스템 도입 등 급변하는 철도환경에 따른 철도안전의 위험요인이 증가하고 있다. 국내 철도사고 사망자는 설비개량, 노후차량교체, 건널목입체화로 감소하고 있으나 10년을 주기로 대형참사가 발생하고 있으며, 철도관련 종사자의 안전의식이 낮은 수준이다. 이러한 대형참사의 발생을 방지하기 위하여 철도안전법이 제정되고 이의 효율적인 시행기반을 구축하기 위하여 철도시설안전체계 구축 및 기술분야별 안전기준을 개발하고 있다. 본 논문에서는 철도종합기술개발사업의 철도사고 위험요인분석(PHA : Preliminary Hazard Analysis)을 토대로 관계있는 위험원을 선정하였다. 또한 위험원에 의한 사고발생을 예방하기 위한 철도신호분야의 안전기준항목을 기술하였다.

• Journal of the Korean Society for Railway
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• v.7 no.1
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• pp.1-8
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• 2004

A newly-built inverter has to undergo a series of stress tests in the final stage of production line. This can be achieved by connecting it to a dynamometer consisting of a three-phase machine joined by a rigid shaft to a DC load machine. The latter is controlled to create some specific load characteristic needed for the test. In this paper a test method is proposed, in which no mechanical equipment is needed. The suggested test stand consists only of a inverter to be tested and a simulator converter. Both devices are connected back-to-back on the AC-side via smoothing reactors. The simulator operates in real-time as an equivalent load circuit, so that the device under test will only notice the behaviour of a three-phase machine under consideration of the load. In oder to prove rightness of the suggested test method, the simulation and actural experiment carried out emulation for a 2.2kW induction motor.

• Proceedings of the KSR Conference
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• 2008.11b
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• pp.1333-1343
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• 2008

Normally, the government or a local autonomous entity selects urban railway(subway, light rail transits etc.) system after investigating logicality about a route and announcing officially for people's convenience if the system is decided, suppliers of equipment(train, transformer, trolly wire, signal, communication, PSD, AFC etc.) are selected and ordering go forward. Stabilization of a total system is need for smooth train operation before opening to traffic by design, installation, total trial operation So, a measure against interface disharmony between each equipment is need. This treatise deals with the systematic method of management and items for interface plan from system design to opening on the evidence of experience of Gwangju subway total interface.

• Proceedings of the KSR Conference
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• 2008.11b
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• pp.1251-1256
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• 2008

Urban railway system has make rapid progress ever since Seoul metro line No.1 was opened in 1974. Now, it is time to prepare system maintenance scheme and procedure that can be available even after 30 years from now. Especially, signaling system must be chosen with considering its life cycle since the system is categorized into electronic equipments. As for current signaling system, mechanical components such as relays has decreased while communication and S/W has integrated in order to implement its correct function. Therefore, it is required to establish system review and switch-over scheme with considering operational environment, maintenance system and an operator. In this paper, therefore, we analyzed various factors - technical, operational and economic - that have effect on system improvement so as to prevent making any mistakes on system improvement.

• Proceedings of the KSR Conference
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• 2004.10a
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• pp.162-167
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• 2004

The ascent and descent market screen door (PSD-Platform Screen Door) between the electromotive car which is in the process of operating from the subway ascent and descent market and the passenger it is an immediacy and crisis as the system which it intercepts currently the inside and outside of the country of course signal system automatic operation signal system (ATO) establishment is operated from the segment. Manual operation signal system (the ATS and the ATC) almost it is a condition which is wholly lacking from the segment. This year from second half of the year 2 line manual operation signal system (ATS). It established the shutting tightly elder brother and the railing elder brother in PSD system in segment 12 reverses and the death accident due to the passenger hurt accident which occurs from the subway. It prevented an energy curtailment in the same time when it raises air cooling efficiency, It gathered it restricted the underground space which is comfortable in the use citizen and and and service it did interface the electromotive car and PSD entrance and exit literature course from the manual operation segment to sleep technically optimizationt. It researched a minute dust diffusion.