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고만석(Man Suk Ko),정진국(Jin Kook Jung),이호형(Ho Hyung Lee),정병욱(Byoung Wook Jung),최호준(Ho Jun Choi),신승권(Seung Kwan Shin) 대한산부인과학회 1999 Obstetrics & Gynecology Science Vol.42 No.8
Objective ; The purpose of this study was to evaluate of course of delivery & perinatal outcomes for postterm pregnancy compared with fullterm pregnancy. Methods ; This study included 360 cases of postterm pregnancy out of 16,992 cases delivered at Department of Obstetrics and Gynecology from January 1, 1993 to December 31, 1997. 16,143 cases of full term deliveries of 38 to 42 gestational weeks conducted in same period were used as the control group. Postterm pregnancy was defined as a pregnancy that it exceeds 295 days calculated from first day of the last menstrual period. Results ; The incidence of postterm pregnancy was 2.13% with the highest incidence occurring in the 26 ∼30 years age group. This study group was significantly different from the control group in the incidence of fetal distress (10.28% vs. 2.20%), large fetus (10.83% vs. 6.95%), perinatal death (1.67% vs. 0.27%). Conclusions ; Adverse perinatal outcomes were increased markedly as the gestational weeks to be prolonged. Therefore, careful prenatal care, accurate determination of delivery date is very important.
박준열(Joon-Yeol Park),고만석(Man-Suk Ko),장래창(Rae-Chang Jang),최홍규(Hong-Kyoo Choi) 한국조명·전기설비학회 2013 조명·전기설비학회논문지 Vol.27 No.9
The prevalence of electronic devices in our modern life is accompanied with the generation of harmonics caused by the nonlinear characteristic load. Especially, the employment of LED have brought the rapid use of SMPS. SMPS is used for supplying the constant DC electric power to the LED display board, but it has a big problem which gives birth of harmonics causing by its high-speed switching. measurement HIOKI 3196 equipment to solve these harmonics were measured. In this study, we are LED Display Board Load Measuring the impedance response with X<SUB>L</SUB> changes for removing harmonics in the measured .And we adopted the suitable passive filter by the impedance response characteristic obtained in the X<SUB>L </SUB>variation experiments. We are trying to deeply the application of passive harmonic filter characteristics that generation in the LED Display Board through EDSA LED simulation.
조계술(Kyeh-Sul Cho),고만석(Man-Suk Ko),신강욱(Gang-Wook Shin),원진희(Jin-Hee Won),최홍규(Hong-Kyu Choi) 한국조명·전기설비학회 2001 한국조명·전기설비학회 학술대회논문집 Vol.2001 No.-
본 연구는 저압간선의 굵기 산정에 있어서 체계적인 설계 흐름도를 분석하였고 Cable size별로 온도변화에 따른 직류 저항값 대비 교류 임피던스값의 변화에 대하여 전압강하를 고려한 간선의 선정기법을 제시하였다.
Fuzzy 추론을 이용한 PWM Inverter에서의 고조파 저감에 관한 연구
최홍규(Hong-kyoo Choi),강태은(Tae-eun Kang),원진희(Jin-Hee Won),전광호(Gwang-ho Jun),조용상(Yong-Sang Cho),고만석(Man-Suk Ko),김진성(Jin-Sung Kim) 한국조명·전기설비학회 2000 한국조명·전기설비학회 학술대회논문집 Vol.2000 No.-
본 논문은 인버터 출력 파형에서 고조파 제거에 대한 이론적인 문제를 제시한다. 제시된 방법은 PWM 인버터 회로의 고조파 왜곡에 관한 문제를 분석하였다. 전압 제어 기법은 펄스 수와 각각의 고조파 크기를 변수로 하여 퍼지 추론에 의한 펄스 폭을 조정함으로써 전압 파형을 개선하였다.