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전동차 실내조명의 flickering 현상에 관한 연구
김명룡(M. R. Kim),김원경(W. K. Kim),백광선(K. S. Back),이강원(K. W. Lee) 한국철도학회 2003 한국철도학회 학술발표대회논문집 Vol.- No.-
Light Flickering of the lamp(fluorescent lamp) with voltage fluctuation operates as an factor harmful to train passengers which is subjective to them. Recently, international flickering standard(IEC61000-3-3) are applied allover the world. However, there are not any study preparing for regulation about light flickering inside running train. In this study, the Flicker phenomenon is investigated from several references and also how the flickermeter is configured and defined. Flicker evaluation using it are studied.
Smoothing 기법을 이용한 속도신호의 노이즈제거 및 가속도 추정
이강원(K. W. Lee),김명룡(M. R. Kim),온정근(J. G. Ohn),홍용기(Y. K. Hong) 한국철도학회 2003 한국철도학회 학술발표대회논문집 Vol.- No.-
The velocity of train which is measured from pulse generator attached to TM is used for displaying or control signal of inverter and so on. Measured signals increase and decrease step-by-step by pulse counting or monotonously by F/V conversion. But noises and signal distortions by measuring error like alias make it difficult to provide correct velocity infomation and estimate the acceleration. In this paper, we investigated the performance of Smoothing method for suppressing the noises in velocity signals. And the difference between Smoothed signal and origin velocity signals is inspected and the comparison with low pass filtering show applicable of Smoothing method for noise rejection and the estimation of signal. Finally, acceleration curves estimated from Smoothing method are compared with real accelerator signal attached to train.
냉연한 고장력 저합금강의 기계적 성질에 미치는 시효 처리의 효과
김명룡,맹선재,현도빈,김동훈 대한금속재료학회(대한금속학회) 1983 대한금속·재료학회지 Vol.21 No.4
Hardness, tensile properties and impact toughness of 0.07C-1.4Mn-0.08Nb and 0.07C-1.4Mn-0.09V steels, which had been cold rolled by different degrees, were studied after aging treatment at 600℃ for varying period of times. By increasing aging times, there appeared two peaks of hardness values or strength. Aging time, which caused the hardness peaks, were independent of cold rolling degree and were constant for the same steel. When compared at the same hardness level, ductility and impact Goughness of the samples of secondary hardness peak were much better than that of the samples of primary hardness peak. Test results of mechanical properties are discussed in relation with the precipitation particle size and its distribution, coherency of the particles, and recrystallization.