• Proceedings of the KIEE Conference
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• 2009.07a
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• pp.1173_1174
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• 2009

Recently, the influence of electromagnetic environment for low frequency range on human body has been being argued. Light Rail Transit (LRT) System is an urban transit system which has approximately an intermediate transportation capacity between conventional subway and bus. The LRT systems have been applied and being operated in about a hundred lines around the world and many projects that apply the LRT systems in Korea are being proceeded and scheduled. LRT system is operated under the electrical circumstance of high voltage and large current and passengers are exposed in those electrical circumstance. In this paper, EMI/EMC for low frequency range of K-AGT system is measured and analyzed comparing with the international standard.

• Proceedings of the KSR Conference
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• 2011.05a
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• pp.745-752
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• 2011

Light Rail Vehicle(LRT) is "New Transit System" that has transportation capacity as well as physical size of vehicle is in-between bus and subway. The demand of LRT system is increasing rapidly; both domestically and internationally. Reason being is that it is more economical and eco-friendly compare to existing heavy rail vehicle. Especially, Busan Subway Line 4 K-AGT (Rubber-tired LRT) being the first of its kind to start revenue service in Korea, it is very much likely that application of its demand will continue to increase. Considering its trend, study to reduce implementation cost of LRT is being pursued in many different aspects; reducing construction cost is one that aspect. In this study, on-site application of 'Up-Down Turnout System' implementation research has been carried out which can replace existing 'Left-Right Turnout System'. When safety of its type gets verified, application of this system to line which intends to use K-AGT, Shin-Lim Line and Dong-Book Line, expects to save its construction cost. This thesis paper reports ongoing research of AGT 'Up-Down Turnout System' development and main component design factors, fundamental principle, performance test result.

• Journal of the Korean Society of Safety
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• v.32 no.5
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• pp.41-46
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• 2017

The coefficient of derailment and the rate of wheel load reduction were used as the index of train running safety that was directly affected the train derailment safety. In aspects of track, the train running safety depends on the complex interaction between wheel and rail, and the track-vehicle conditions (i.e., the curvature, cant, track system, vehicle speed and the operation conditions, etc). In this study, the relationship between the train running safety and the track curvature and vehicle speed for direct fixation concrete tracks currently employed in Korean light rapid transit was assessed by performing field tests using actual vehicles running along the service lines. The measured dynamic wheel load, lateral wheel load and lateral displacement of rail head were measured for same train running on four tested tracks under real conditions, which included curved and tangent tracks placed on the tunnel and bridge, thus increasing the train speed by approximately maximum design speed of each test site. Therefore, the measured dynamic track response was applied to the running safety analysis in order to evaluate the coefficient of derailment, the rate of wheel load reduction and the track gauge widening at each test site, and compare with the corresponding Korean train running safety standard. As the results, the lateral track response of direct fixation concrete track appeared to increase with the decreased track curvature; therefore, it was inferred that the track curvature directly affected the train running safety.

• Transactions of the KSME C: Technology and Education
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• v.1 no.1
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• pp.139-145
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• 2013

Light rail transit(LRT) is a public transportation and mainly has an automatic driverless operation system. LRT project is a large scaled project which a construction cost is tens of billions of won per km. Systems engineering(SE) is an interdisciplinary approach and means to enable realization of successful systems. In this paper, we propose the systems engineering processes and their outputs list for the LRT project. And then, we present template and sample case of process output. We also present a case which carried out SE process by SE tool.

• The Transactions of the Korean Institute of Power Electronics
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• v.14 no.6
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• pp.481-487
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• 2009

This paper proposes a regulation method of DC line voltage for urban transit system fluctuated during the acceleration or deceleration by using supercapacitor. Supercapacitor is modelled electrically under the assumption of three different time constants of RC circuits with variable capacitances depending on the voltage. And its parameters are determined by the experimental measurements. The energy storage system using supercapacitors is installed based on this model, and the proposed model is tested through the simulations and experiments, and the controller for charging and discharging is designed. Finally, it is tested at Kyoungsan test site for the urban light rail road system and the energy saving effect is evaluated economically.

• The Transactions of The Korean Institute of Electrical Engineers
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• v.64 no.4
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• pp.640-645
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• 2015

Near surface transit system has should be constructed as installation cost of light rail transit with elevated track. So, distance between two substations is longer than conventional system. The long feeding distance results in severe voltage drop. This paper proposes a PWM rectifier instead of diode rectifier. The PWM rectifier has some advantages. This is able to control output voltage constantly to reduce voltage drop and to use regeneration power without additional inverter. This paper analyse on improved voltage profile and cost of substation with PWM rectifier. The analysis of voltage profile use PSIM, and the installation cost of substation with PWM rectifier is compared to substation with diode rectifier.

• Proceedings of the KSR Conference
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• 2011.10a
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• pp.2292-2299
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• 2011

The CBTC(Communication Based Train Control) system, a recent train control system, is a wireless communication based train control system that is operated in the moving block system control by tracking trains in real time. In additioin, the system helps to increase the volume of traffic by shortening driving headways through controlling moving block system control. Furthermore, driverless modes are performed by controlling ATP(Automatic Train Protection)/ATO(Automatic Train Operation). In this paper, controllable elements in ATO driverless train control system, affecting comfortable ride, will be analysed and applied to CBTC train control system that developed by POSCO ICT. Finally, the test results of improved comfortable ride will be showed by appling the developed system to the Gyeong-san light rail transit test track.

• Proceedings of the KSR Conference
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• 2006.11b
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• pp.288-293
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• 2006

In this work, the characteristics and the improving method of train performance of Korean rubber-tired AGT system(K-AGT) and Urban MAGLEV system are evaluated by using Train Performance Simulation(TPS). The train performance characteristics of K-AGT were analysed according to the change of maximum running speed and those of Urban MAGLEV were evaluated according to a vehicle weight variation. In the result of simulation in virtual line, the scheduled speed and the running time of K-AGT system have no difference with Urban MAGLEV system if the maximum running speed is equal. But the energy consumption of Urban MAGLEV system is more than that of K-AGT system. The analyses showed that in case of a 20 percent vehicle weight reduction of Urban MAGLEV system, the energy consumption per person is similar with the K-AGT system. The Urban MAGLEV system is more efficient in long travel distance condition than in short running distance condition in the aspect of train performance.

• Proceedings of the KSR Conference
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• 2003.05a
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• pp.349-355
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• 2003

Traffic congestion caused by cverpopulation has a major detrimental effect on bringing about social and economic problems ia city area. Therefore Un order to maintain and sustain smooth flow of railway system, we are willing to introduce Light Rail Transit System. Rubber wheel type and guideway far AGT have been concentrated on our study Especially, the prototype of LRT turnout system has been developed. Furthermore, the structural analysis for the guideway system has been completed to secure reliability for the LRT system. In the near future, the tumout system of rubber wheel and guideway shall be applied in Korea. We hope reliability fer the system shall be secured without any major difficulties. As a result, we expect to expedite the localization of rubber wheel type and guideway for AGT.

• Proceedings of the KIEE Conference
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• 2001.07b
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• pp.1251-1253
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• 2001

This paper presents on capacity design of DC-fed-traction system. The system is introduced including a characteristics of train, feeding network configuration, and design method of substation arrangements. Optimal design procedures is described, and program for capacity computation of the system is presented using the nodal equation, K.C.L, K.V.L, Ohm's law and superposition theory. For the proof of the proposed algorithm, we accomplished the simulation of DC traction system for HA-Nam LRT. By considering whole component in DC traction system the conclusion will be much precise.