• Proceedings of the KSR Conference
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• 2004.06a
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• pp.1315-1318
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• 2004

Each feeding power is transformed 3 phases of KEPCO through SCOTT transformer and operate a electric train in AC Feeding system of electric railway. Nowaday a power conversion system, installed inside the train, generate a harmonics and has a effect on a power quality and it is necessary to install a countermeasures. This report is proposed a new technique to simulate a power system based on frequency model. The result is resonable relatively with a experimental one.

• Proceedings of the Korean Vacuum Society Conference
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• 2009.02a
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• pp.97.1-97.1
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• 2009

• Proceedings of the IEEK Conference
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• 1998.06a
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• pp.255-258
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• 1998

이동로봇이 움직이는 물체를 추적하는 기능을 갖도록 하기 위해서는 움직이는 물체의 존재를 판단하고 위치 및 속도벡터를 측정해야 한다. 본 논문은 단시간에 이동 물체의 위치와 속도벡터 추정하여 실시간 추적이 가능하도록 하기 위해 초음파센서를 이용한 가상의 초음파영상 해석방법을 제안한다. 초음파 영상은 초음파센서의 매회 측정값을 누적하여 구성하며 거리축과 시간축을 갖는 2차원 영상으로 표현된다. 영상에서 측정된 물체가 만드는 선분의 기울기에 따라 이동하는 물체와 정지한 물체를 분리하고 속도를 측정한다. 제안된 방법은 시뮬레이션을 통해 타당성을 입증하였다.

• 정보화사회
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• s.169
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• pp.20-22
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• 2004

1994년부터 10년동안 베트남의 통신 보급률을 살펴 보면 베트남 국민들이 어떤 것을 좋아하는 지 알 수 있다. 정확히 표현하자면, 베트남 젊은이들의 IT에 대한 관심의 수치라 할 수 있을 것 같다. 특히 아직까지 전체 인구대비 5% 수준에 머물고 있지만 무선통신 서비스(238배)와 인터넷에 대한 성장률(621배)은 가히 폭발적이라 할 수 있다. 이러한 통신 환경의 폭발적인 성장은 베트남이 1986년 ‘도이모이(혁신)’로 일컬어지는 개혁.개방정책을 채택하면서 이루어지고 있다.

• Proceedings of the Korean Ceranic Society Conference
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• 2000.04a
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• pp.38.2-38.2
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• 2000

• Proceedings of the Korean Ceranic Society Conference
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• 2003.04a
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• pp.204.1-204
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• 2003

• Proceedings of the KIEE Conference
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• 2005.10b
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• pp.216-218
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• 2005

This paper present a new approach to a noise robust recognizer for WPS interface. In noisy environments, performance of speech recognition is decreased rapidly. To solve this problem, We propose the recognition system using vocal-cord signal instead of speech. Vocal-cord signal has low quality but it is more robust to environment noise than speech signal. As a result, we obtained 75.21% accuracy using MFCC with CMS and 83.72% accuracy using ZCPA with RASTA.

• 제어로봇시스템학회:학술대회논문집
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• 1988.10a
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• pp.54-57
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• 1988

In this thesis, after the inverted pendulum being made, its state equation was established with parameters obtained by the state space approach and its position stabilization control was performed with VSS. The switching function of VSS was obtained from pole placement method and as the result of VSS control was compared with that of optimal regulator control, its robustness was clarified in sliding mode. The position and stabilization control of the inverted pendulum Wstem were acomplished with VSS.

• Proceedings of the Korean Society For Composite Materials Conference
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• 2003.10a
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• pp.67-70
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• 2003

To develop an effective geometric modeling is essential in order that precise mechanical properties and the geometrical properties of the 3-D braided composites can be estimated. RVE(representative volume element) was adopted fur geometrical modeling. RVE consisted of IC(inner unit cell), ISUC(interior surface unit cell) and ESUC(exterior surface unit cell). The whole geometrical model fur hybrid 3-D braided composites was developed.

• Proceedings of the KSR Conference
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• 2005.05a
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• pp.883-888
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• 2005

In modern system, electromagnetic environment are going worse with advancing electric and electronic technology, and this electromagnetic environment affect modern electric train system at the point of the safety problem. Therefore, each distributed system that is consisting electric train system have to prove there own electromagnetic compatibility through the field test. These distributed system can be considered as power supply system, signal & communication system and train system. In this study, essential field tests for electromagnetic compatibility of train system based on IEC national standard are suggested.