• Title/Summary/Keyword: Kim Sang-Ik

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A Study on the Time-varying Harmonics Measurement, Assessment and Simulation of the High Speed Electric Train Loads (시간에 따라 변하는 고속철 부하의 고조파 측정, 평가 및 시뮬레이션에 관한 연구)

  • Kim, Kyung-Chul;Jin, Seong-Eun;Lee, Il-Moo;Wang, Yong-Peel;Kwak, No-Hong;Jeon, Young-Soo;Park, Sang-Ho
    • Proceedings of the KIEE Conference
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    • 2006.07a
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    • pp.78-80
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    • 2006

  • High speed electric trains have nonlinear loads including converters and inverters for the control synchronous motors. Harmonic field measurements have shown that the harmonic contents of a waveform varies with time. Direct application of the harmonic assessment to the snapshot measurements would result in ambiguous conclusions depending on which instant is sampled. A cumulative probabilistic approach is the most commonly used method to solve time varying harmonics. This paper provides an in depth analysis on harmonics field measurement of the high speed electric train loads, harmonics assessment by the international harmonic standards IEC 61000-3-6 and IEEE Std. 519-1992, and harmonics simulation using EDSA program for the case study.

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Experimental and computational study of acoustic performance of the aircraft hush house (항공기 소음 저감시설의 음향 성능 관련 실험 및 예측에 관한 연구)

  • Jung, Hwan-Ik;Kim, Kwan-Ju;Park, Jin-Kyu;Kim, Sang-Hun
    • Proceedings of the Korean Society for Noise and Vibration Engineering Conference
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    • 2005.05a
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    • pp.754-757
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    • 2005

  • Aircraft noise is the serious problem for inhabitants near an air force base. Noise by ground test of aircraft, however, can be minimized through test room construction. In this study, environmental effects of the noise by aircraft ground test were investigated by experiments under the standard act and by performance, prediction of the Hush house, constructed for the noise reduction.

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A Study on Effective Identification Method for Influential Main Effects and Interactions in the 2-level Factorial Designs (2-수준 요인실험에서 주효과 및 교호작용에 대한 효율적인 분석방법 연구)

  • Kim, Sang-Ik
    • Journal of Korean Society for Quality Management
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    • v.34 no.1
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    • pp.27-33
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    • 2006

  • In this paper, an effective method for identifying influential main effects and interactions in the 2-level factorial designs is suggested by exploiting the resolution V designs developed by Kim(1992). For analysis of such designs, we employ the Bayesian approach for easy and clear identification of influential effects in the half normal probability plot.

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