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벅+하프 브리지 컨버터에서 벅 컨버터의 출력 인덕턴스 값과 스위칭 주파수,변압기 코어 형태에 따른 효율 특성
박남진(N.J.Park),김창선(C.S.Kim),김태식(T.S.Kim),임범선(B.S.lm),우승훈 (S.H.Woo) 전력전자학회 2003 전력전자학술대회 논문집 Vol.2003 No.7(1)
We considered of the efficiency for the Buck+Half bridge converter Tins converter has advantages of applications for a low output voltage, a high output current and a wide input voltage Developed the Buck converter ratings and the Half Bridge converter ratings are 36-72V input and 22V/5A output, 19-24V input and 3.3V/30A output, respectively, Buck converter is operated with zero voltage switching process to reduce the switching losses The 80 1 -97 6% of the efficiency is measured at 184μH output filter inductance of Buck converter. In Half Bridge converter, the 86-96 4% of the efficiency is measured at 100kHz switching frequency with PQI core<br/>
김형득,이병일,김연일,나수균,최창욱,박남진 순천향대학교 1986 논문집 Vol.9 No.2
The management of the femoral shaft fracture in children is quite different from that of in adult because of the differences of the anatomy, biomechanics, and physiology of a child's skeleton. Generally, femoral shaft fractures in children heal easily and satisfactorily with conservative treatment. Among 71 cases of femoral shaft fractures in children who were treated at Soonchunhyang university hospital during period from Jan. 1980 to Dec. 1985, only with 50 cases follow up study was made and analyzed both clinically and radiologically. The following results were obtained; 1. The ratio of male and female was about 1.3:1 and the highest incidence was between the age of 5 and 8 years(50%). 2. The main cause of fracture was traffic accident(82%) and the next most frequent one was fall down. 3. Middle 1/3 of the femoral shaft was most commonly injuried(64%) and transverse type was common. 4. 43 cases were treated with conservative and 7 cases by open reduction with internal fixation. 5. In general, angulation at fracture site was under 15 degree at final examination. 6. Among 50 cases, overriding of the fractured fragments was occurred in 28 cases and the average overriding was 1.2cm in length.