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D-STATCOM의 스위칭 주파수 저감을 위한 이중밴드 히스테리시스 전류제어에 관한 연구
김범식(B.S. Kim),신은철(E.C. Shin),오원현(W.H. Oh),이상빈(S.B. Lee),유지윤(J.Y. Yoo) 전력전자학회 2004 전력전자학술대회 논문집 Vol.- No.-
The current control using a conventional hysteresis controller of a STATCOM based on two level VSI has high switching frequency. This will increase the switching loss. In addition, the current error is not strictly limited. So, in this paper to reduce the switching frequency, a novel double band hysteresis current controller based on three level VSI(Voltage Source Inverter) is proposed. A conventional hysteresis current control and a novel hysteresis current control was tested with digital simulation in the Borand C++program and demonstrate the advantage of the novel hysteresis current controller.
국군 수도병원의 심혈관계 수술 304예에 대한 임상적 고찰
선경,박영환,김범식,이건우,이영욱,백광제,정원상,곽영태,김형묵,Sun, K.,Park, Y.H.,Kim, B.S.,Lee, K.W.,Lee, Y.W.,Baek, K.J.,Jung, W.S.,Kwak, Y.T.,Kim, H.M. 대한흉부심장혈관외과학회 1988 Journal of Chest Surgery (J Chest Surg) Vol.21 No.6
From 1959 through Jun. 1988, 2094 cases of various Cardiovascular diseases were operated, which were consisted of 1215 open heart surgery under extra-corporeal circulation or hypothermia and 879 conventional Cardiovascular Surgery at Department of Thoracic & Cardiovascular Surgery in National Medical Center. There were 1111 congenital heart anomalies and 983 acquired cardiovascular diseases. Among 1111 congenital cases, acyanotic cases were 748 and cyanotic cases were 363. In acquired heart cases, valvular heart diseases [702 cases] were the most frequent and a small No. of cardiac tumor and coronary artery diseases were included. Overall operative mortality was 9.3%, consisting of 4.6% for acyanotic anomaly, 20.6% for cyanotic anomaly and 8.7% for acquired heart diseases. In open heart surgery, overall mortality was 11.6% and 6% in conventional cardiovascular surgery.