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金海俊(Hae-Jun Kim),元載善(Jae-Sun Won),朴宰煜(Jae-Wook Park),徐喆植(Cheol-Sik Seo),李成熙(Seung-Hee Lee),沈光列(Kwang-Yeal Sim),金鍾海(Jong-Hae Kim),金東熙(Dong-Hee Kim) 대한전기학회 2007 전기학회논문지 Vol.56 No.12
A novel design technology for a high frequency electronic ballast for metal-halide discharge lamps is proposed. A PFC technique is adopted to get unit power factor and output frequency alteration technique is adopted to avoid acoustic resonance. For characteristics evaluation, the designed electronic ballast is presented using normalized parameter. To reduce losses of the ballast, ZVS control technique is adopted and the maximum flux density of magnetic core for inductor should be kept lower. The electronic ballast for 250[W] metal-halide discharge lamp is implemented and 96[%] efficiency and low conducted EMI level are accomplished.
김정표 ( Jeong Pyo Kim ),김성훈 ( Seong Hun Kim ),이해규 ( Hae Giu Lee ),성미숙 ( Mi Sook Sung ),김영실 ( Young Sil Kim ),김형민 ( Hyoung Min Kim ),민준기 ( Jun Ki Min ) 대한류마티스학회 2003 대한류마티스학회지 Vol.10 No.1
Sarcoidosis is a multisystemic granulomatous disease of unknown cause. Lung, skin, eye, liver and lymph nodes are commonly affected. But the nodular type of muscular sarcoidosis is rare. The nodular type can be presented with a soft tissue mass that may be confused with a tumor. Magnetic resonance imaging and muscle biopsy are useful methods for early diagnosis. Optimal management of nodular sarcoidosis is not well known, but surgical excision or corticosteroid may be considered as an initial management. We report a case of nodular muscular sarcoidosis as an initial manifestation of sarcoidosis in a 56-year-old woman who was treated with corticosteroid therapy after surgical excision.
부스터 컨버터가 결합된 Push-Pull형 고주파 공진인버터에 관한 연구
김해준(Hae-Jun Kim),서철식(Cheal-Sik Seo),원재선(Jae-Sun Won),김동희(Dong-Hee Kim),노재균(Chae-Gyun Ro) 한국조명·전기설비학회 2000 한국조명·전기설비학회 학술대회논문집 Vol.2000 No.-
This paper describes a Push-Pull type high frequency resonant inverter composed of consolidation of boost converter circuit and resonant inverter circuit. By using a boost converter circuit, the proposed inverter can obtain a twice input voltage of resonant circuit and reduce a secondary turn ratios. Also, by using both switching device of boost-converter and resonant circuit, the number of switching device can be reduced by half. The analysis of the proposed circuit was generally described by using normalized parameter and operating characteristics have been evaluated as to switching frequency and parameters. In the future, this proposed inverter shows that it can be practically used as a power source system for the lighting equipment of discharge lamp, induction heating applications.