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Kim, Seungjoon,Moon, Changjong,Wie, Myungbok,Kim, Hyungmin,Tanuma, Naoyuki,Matsumoto, Yoh,Shin, Taekyun 濟州大學校 農科大學 動物科學硏究所 2000 動物科學論叢 Vol.15 No.1
To elucidate the role of nitric oxide synthase (NOS) in the pathogenesis of experimental autoimmune encephalomyelitis (EM), we analyzed the expression of constitutive neuronal (nSOS), endothelial (eNOS) and inducible NOS (iNOS), an enzyme of NO production, in the spinal cords of rats with EAE. We further examined the structural interaction between apoptotic cells and spinal cord cells including neurons and astrocytes, which are potent cell types of NO production in the brain. Western blot analysis shows that three isoforms of NOS significantly increased in the spinal cords of rats at the peak stage of EAE, while minimal amounts of these same enzymes are identified in normal rat spinal cords. Immunohistochemical study showed that brain cells includmg neurons and astrocytes revealed an increased expression of either nSOS and/or eNOS during the peak and recovery stages of EAE, while iNOS was found mainly in the inflammatory macrophages in the perivascular EAE lesions. Double labeling showed that apoptotic cells had intimate contacts with either neurons or astrocvtes, which are major cell types to express nNOS and eNOS constitutively. Our data suggests that both constitutive nSOS and eNOS as well as iNOS, possibly producing NO, plays an important role in the recovery of EAE.
절연형 LED 조명기기를 위한 커패시티브 출력 여과기를 가진 포워드 전력 변환기
김명복(Myungbok Kim) 전력전자학회 2011 전력전자학술대회 논문집 Vol.2011 No.7
In order to increase the power conversion efficiency and improve the power factor, a modified forward converter is proposed, which adopts a capacitive output filter instead of the inductive output filter of the conventional forward converter. Therefore, the proposed converter has wide input voltage range in opposite to that of the conventional forward converters. Moreover, the proposed converter uses the critical conduction mode for automatic current shaping to improve the power factor. As a result, the proposed converter can achieve quasi-resonant zero-voltage-switching, which can minimize the switching loss of main MOSFET. In addition, the operational principle of the proposed converter is analyzed and the characteristic of the proposed converter is investigated in this paper. To validate the effectiveness of the proposed converter, a prototype of 13W is implemented and the experimental results are discussed in more detail.
지능형 고효율 제어 기법을 적용한 전기식 동력인출장치용 전력변환시스템
곽봉우(Bongwoo Kwak),김명복(Myungbok Kim) 한국지능시스템학회 2018 한국지능시스템학회논문지 Vol.28 No.3
본 논문에서는 지능형 고효율 제어 기법을 적용한 전기식 동력인출장치용 전력변환시스템 개발을 제안한다. EV 플랫폼에 적용되는 전기식 동력인출장치 구동은 배터리를 사용하여 전원을 공급한다. 배터리를 사용하는 시스템의 경우 낮은 배터리 전압에서 AC 전압을 만들기 위한 높은 링크 전압을 만들어야 한다. 고전류 사양전력변환시스템은 전력반도체의 스위칭 손실로 인한 발열 및 낮은 효율의 문제점을 가진다. 따라서, ZCS(영 전류 스위칭) 및 ZVS(영 전압 스위칭) 구현이 가능한 토폴로지가 유리하다. 기존의 LLC 컨버터의 경우 전부하 영역에서 ZVS 및 ZCS를 통해 고효율이 가능하나 고전류 사양에서 입력 전류가 더 높아지는 문제점을 가지고 있다. 따라서, 제안하는 전기식 동력인출장치용 전력변환시스템에서는 LC 직렬 공진 컨버터 토폴로지 및 지능형 제어 기법을 사용하여 전부하 ZCS를 통해 고효율을 달성할 수 있다. 전기식 동력인출장치용전력변환시스템 및 제어 알고리즘을 구현하고 실험을 통해 실용성을 입증하였다. In this paper, we propose the development of a power conversion system for an electric power take-off using intelligent high efficiency control technique. The electric power take-off that is applied to the EV platform is powered by the battery. In such system, step-up of the low battery voltage is required to generate the AC voltage. High current power conversion systems have problems of heat generation and low efficiency due to the switching losses of power semiconductors. Therefore, ZCS and ZVS topology have some advantages in high current power conversion systems. Conventional LLC converters can improve efficiency through ZVS and ZCS in all load regions. However, LLC is required a high input current in a high current system. To solve this problem, we propose a power conversion system which can achieve high efficiency by using ZCS in all load regions. In addition, LC series resonant converter topology and intelligent control method is used to improve ZCS performance. Experiment result validate the effectiveness of the proposed electric power take-off scheme.
Cascode GaN FET의 게이트 구동 회로 및 특성 분석
곽봉우(Bongwoo Kwak),김명복(Myungbok Kim) 전력전자학회 2021 전력전자학술대회 논문집 Vol.2021 No.11
본 논문에서는 Cascode GaN HEMT 구동을 위한 게이트 회로를 분석하고, 게이트 Ringing 및 Overshoot를 최소화하기 위한 페라이트 비드 및 RC snubber를 적용한 게이트 회로를 설계 하였다. 게이트 회로에 따른 스위칭 특성 분석을 위해 Double Pulse Test(DPT) 시스템을 구축하고, 실험 결과를 분석하였다.