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PCB 캐패시터를 이용한 플라이백 SMPS 출력 리플 저감 대책
김태근(T.G.Kim),정교범(G.B.Chung),이완윤(W.Y.Lee) 전력전자학회 2003 전력전자학술대회 논문집 Vol.2003 No.7(1)
The leakage inductance of the High Frequency Transformer(HFT) in the flyback topology can be used an inductor of the Low Pass Filter(LPF) to reduce ripple and ripple noise in the output voltage. But, the values of leakage inductance and magnetizing inductance in the HFT are within ±20[%] And the operating temperature of the HFT increased by the leakage inductance Therefore, the leakage inductance of the HFT in the flyback topology has minimum and the LPF has non-polarity ceramic capacitor in the output stage. In this paper, the LPF in the flyback topology takes PCB capacitor using double layer of PCB without non-polarity ceramic capacitor Its experimental results show the reduced ripple noise and the reduced ripple in the output stage
Landsat TM 영상자료를 이용한 대청호의 영양상태 평가
한의정,김태근,정동환,천세억,김신조,유순주,황종연,김태승,김명희,Han, E.J.,Kim, K.T.,Jeong, D.H.,Cheon, S.Y.,Kim, S.J.,Yu, S.J.,Hwang, J.Y.,Kim, T.S.,Kim, M.H. 한국환경영향평가학회 1998 환경영향평가 Vol.7 No.1
The objective of this study was to use remotely sensed data, combined with in situ data, for the assessment of trophic state for Daecheong reservoir. Three Landsat TM(Thematic Mapper) imagery data were processed to portray trophic state conditions. The remotely sensed data and the measured data were obtained on 20 June 1995. Regression models have been developed between the chlorophyll-a concentration and reflectance which was converted to Landsat TM digital data. The regression model was determined based on the correlation coefficient which was higher than 0.7 and was applied to the entire study area to generate a distribution map of chlorophyll-a and trophic state. The equation, providing estimates of chlorophyll-a concentration, represented the year-to-year spatial variation of trophic zones in the reservoir. Satellite remote sensing data derived from Landsat TM had been successfully used for trophic slate mapping in Daecheong reservoir.