• Proceedings of the KSR Conference
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• 2011.10a
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• pp.1641-1649
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• 2011

Dynamic response of high-speed railway bridges is important due to the possibility of resonance from continuous and repeated action of high-speed train running. The designer's decision and application affect the result of dynamic analysis significantly, therefore guideline for dynamic analysis is required. On the purpose of the selection of resonable model for dynamic analysis, this study investigated load distribution effect.

• Proceedings of the KOR-KST Conference
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• 1996.06a
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• pp.95-128
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• 1996

Dipped track profiles between rail transit stations can significantly reduce propulsive energy, braking energy and travel times. This work quantifies their potential benefits for circumstances reflected in various values for dips, speed and acceleration limits, station spacings, and available power. A deterministic simulation model has been developed to precisely estimate train motions and performance using basic equations for kinematics, resistance, power and braking. For a dip of 1% of station spacing, in which gradients never exceed 4%, our results show savings (compared with level tracks) exceeding 9% for propulsive energy, 15% for braking energy and 5% for travel time between stations.

• Journal of Korean Society of Transportation
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• v.8 no.2
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• pp.67-75
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• 1990

This paper treats the problem to schedule for trains with how transit priority so as to maximizing the number that can be sent during given time periods without interfering with the fixed schedule for train with high transit priority in a track. We transform the this problem into Time Expanded Network without traverse time through application of Ford and Fulkerson Model and construct the Enumeration Algorithm for solutions using TENET Generator (TENETGEN). Finally, we compare our algorithm with Dinic's Maximal-Flow Algorithm and examine the avaliability of our procedures in personal computer.

• Proceedings of the Korean Institute of Intelligent Systems Conference
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• 2007.04a
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• pp.364-366
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• 2007

본 논문은 철도차량이 주행하는 선로에 존재하는 수많은 곡선과 경사, 속도 제한 조건 때문에 열차성능해석 계산시 열차의 견인, 제동 특성이 비선형이기 때문에 해석적인 방법으로 해를 구하는데 어려움이 많은 경제운전 문제를 운행 시간 여유분을 고려하여 에너지 소비를 최소화하는 운전 모형을 제시한다. 경제운전모형을 한국형 고속열차에 적용하여 그 타당성을 입증하였다.

• Proceedings of the Computational Structural Engineering Institute Conference
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• 2004.10a
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• pp.68-75
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• 2004

In this paper a study on the reduction method of ground vibration by a french is carried out. The transmitted load into the ground which induces the ground vibration is computed through a study on the interaction between tilting car and the line. This load is applied into the numerical model which is one for a study on the reduction method of ground vibration by a trench. Then the numerical results is compared with the experimental results conducted in the previous study.

• Proceedings of the KSR Conference
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• 2001.10a
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• pp.459-466
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• 2001

As the Public use part of the railway and the road, the railway crossing is important to work properly by two transportation means. Also, It is important to provide the good face of friction on the railway crossing in aspect of protecting the railway crossing accident. Lately, the material of railway crossing panel is the wood, the asphalt, and the steel. As they have a various fault, it was studied to analyze the structural action of the new material, rubber panel. This paper analyzed eigenvalue, stress and displacement by truck passing weight, thermal stress and train moving weight, using the FEM model.

• Proceedings of the KSR Conference
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• 2000.11a
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• pp.688-695
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• 2000

This study presents an approach to model and to analyse traction power feeding system focused on the amplification of harmonic current. Through the research we can conclude the following: - The resonance frequency is not depend on the location of vehicle. The magnification of harmonic is, however, a function of the position of a train. - The resonance frequency is lower as catenary length is longer.

• Proceedings of the KSR Conference
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• 2007.11a
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• pp.982-988
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• 2007

The input data for the interior material of the train is one of the key points for enhancing the accuracy of fire simulation. In this study, we investigated the Fire Test Methods for the Fire Dynamic Simulator modeling for railroad passenger trains. We should get the thermal inputs such as ignition temperature, conductivity, specific heat, vaporization heat, effective heat release. With the simple conduction model for cone-calorimeter test, they could get more than HRR. Kinds of methodology were introduced for better thermal data for real material.

• Proceedings of the KSPS conference
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• 2006.05a
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• pp.139-142
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• 2006

Speaker verification systems can be implemented using speaker adaptation methods if the amount of speech available for each target speaker is too small to train the speaker model. This paper shows experimental results using well-known adaptation methods, namely Maximum A Posteriori (MAP) and Maximum Likelihood Linear Regression (MLLR). Experimental results using Korean speech show that MLLR is more effective than MAP for short enrollment utterances.

• Proceedings of the KIEE Conference
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• 1997.07e
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• pp.1859-1860
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• 1997

다전극 DFB(distributed feedback) 레이저서, 레이징모드간 비팅을 통하여 초고속으로 자려펄스열을 발생시킬 수 있음을 제안한다. 이러한 자려펄스생성을 수정된 시영역 동적 모델(large signal time-domain dynamic model)을 이용하여 조사하였다.