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LED 전조등 수명시험장비의 조도측정모듈 제어방식에 대한 연구
온정근(J.G.Ohn),노지호(J.H.Noh),정종덕(J.D.Chung) 한국도시철도학회 2017 한국도시철도학회논문집 Vol.5 No.3
The device for a life test of a railway vehicle headlight LED was produced and design. The manufactured life test apparatus has a structure in which the illuminance of a plurality of samples is measured by a single illuminance measuring apparatus. In order to measure the illuminance of the life test apparatus, all the samples were turned off, and then the individual power was supplied sequentially to select the measurement method. However, this illumination measurement method has a phenomenon in which the measured illuminance differs from the normal illuminance when the sample is turned off and then supplied again. In this paper, we investigate the cause of the difference in illuminance and studied the illuminance measurement method to solve it.
노지호(J.H.Noh),온정근(J.G.Ohn) 한국도시철도학회 2016 한국도시철도학회논문집 Vol.4 No.3
Railway system are operated safely by the Railway Safety Act. However, because railway of our country has many underground and tunnels, if an accident can cause massive damage to human. In order to minimize the loss of life must obtain a minimum field of view that passengers and crew could be evacuated. Railway vehicle technology standards has a criteria for the emergency lights are specified in order to secure a minimum field of view. However, depending on the type of incident may be an abnormal circumstances that can not operate the emergency lights installed occurs. This paper investigated the circumstances that affect the cabin emergency lighting system and complementing this research was the cabin emergency lights system.
전기철도환경하에서의 서지방호용 절연변압기 제작 및 성능평가
이강원(K. W. Lee),김명룡(M. Y. Kim),온정근(J. G. Ohn),박대원(D. W. Park),박건영(K. Y. Park) 대한전기학회 2006 대한전기학회 학술대회 논문집 Vol.2006 No.10
The main aim of the paper is the study of the surge voltages in electric rail way signal security system. Hence these studies will provide means of introducing a suitable protective device insulating transformer. This influences the surge voltage interrupting capacity using surge arresters and bypass capacitors. This circuit can be used for investigating surge phenomenon in electric railway signal security system. In this paper a insulating transformer has been introduced for the reduction of surge voltages in the above circuit model and performance evaluation.
전동차의 전력품질저하에 따른 광플리커 현상에 관한 연구
최영하(Y. H. Choi),이강원(K. W. Lee),김명룡(M. Y. Kim),온정근(J. G. Ohn),송중호(J. H. Song) 한국철도학회 2004 한국철도학회 학술발표대회논문집 Vol.- No.-
Light flickering is caused by the degradation of power quality in electric train and can be measured by electronic illuminometer. This paper has shown the relations between voltage variations and illumination of lamps which has two kinds of incandescent lamp and 3-wavelength fluorescent lamp.
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.