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써멀 메니지먼트(Thermal Management)에 의한 3상 전압형 인버터의 전력손실 최적화 설계
曺水億(SE Cho),朴晟濬(SJ Park) 대한전기학회 2007 전기학회논문지 Vol.56 No.10
Recently, the demand for the low cost power conversion equipment is rapidly increased. To develop this three phase voltage source inverter, optimum power conversion equipment to system is designed. The optimum operation method to minimize the power loss also satisfy the life time of the power electronics that is request in the present industry. In this paper, the efficient operating method to change of the acceleration, jerk, and switching frequency in the interval of acceleration is selected to optimize the power loss and life time of the power electronics by using the elevator model. So, we proposed the method that 50[A] rating power electronics is adopted in 9[㎾] load.
전력 손실 평균화 기법에 의한 3상 전압형 인버터의 소손 모드에 관한 연구
조수억(SE Cho),박성준(SJ Park) 대한전기학회 2010 전기학회논문지 Vol.59 No.3
This paper is to design an optimum power conversion device for the system required for development of a low cost 3-phase power inverter. For this purpose, in order to meet with endurance required by the industry, failure mode is standardized to guarantee lifetime of a power semiconductor by monitoring real time power loss and to facilitate failure mode analysis. As normality of heat loss of a power semiconductor is identified remaining in a certain range by comparing heat rise slope between that is calculated by using average current or average loss and that is measured at a heat sink, its feasibility is confirmed by experiment.
이용훈(YH Lee),이호열(HY Lee),박성준(SJ Park),이강혁(GH Lee),박윤기(YK Park),고민환(MH Koh) 대한산부인과학회 1999 Obstetrics & Gynecology Science Vol.42 No.4
Objective: Cornual or interstitial pregnancy rarely occurs. Its incidence is estimated 2-4% of all tubal pregnancy, but it causes serious maternal mortality and morbidity. The authors surveyed 37 cases with cornual pregnancy and propose analysis from the clinical statistical aspect. Methods: We studied 37 cases which have occured from May. 1, 1983 to Dec. 31, 1998 at Department of Obstetrics & Gynecology, College of Medicine, Yeungnam University, Daegu. Results: The incidence of cornual pregnancy was 1 in 35.1 ectopic pregnancies. Shock was more frequent, intra-abdominal hemorrhage below 500ml was 35.1%, above 2,000ml was 24.3%. The most frequent interval between LMP and the onset of symptom was 8-12 weeks in 54.1%. 70.3% of total cases were treated by cornual wedge resection, 24.3% by total abdominal hysterectomy. Conclusion: Early detection of cornual pregnancy is essential in avoiding a fatal outcome. Although most of cornual pregnancies were treated with traditional operative techniques, it is useful to conduct conservative or non-conservative management by laparoscopy and treat medically.