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ZCS 보조회로를 이용한 ZVT Boost 컨버터에 관한 연구
류동균(D.K. Ryu),이우석(W.S. Lee),최태영(T.Y. Choi),서민성(M.S. Seo),원충연(C.Y. Won),김영렬(Y.R. Kim) 전력전자학회 2001 전력전자학술대회 논문집 Vol.2001 No.-
Recently, a ZVT boost converter is embedded in a power factor correction system. The control circuit of the converter assures soft-switching for all the MOSFETs and load regulation The PFC system contains additional control circuits which assure the input voltage in a sinusoidal form and feed-forward line voltage regulation. In this paper, a soft switching boost converter with zero-voltage transition(ZVT) main switch using zero-current switching(ZCS) auxiliary switch is proposed. Operating intervals of the converter are persented and analyzed. The proposed results show that the main switch maintains ZVT while auxiliary switch retains ZVT whiles auxiliary switch retains ZCS for the complete specified line and load conditions.<br/> <br/>
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서민성(M.S.Seo),류동균(D.K.Ryu),김이훈(L.H.Kim),김준호(J.H.Kim),원충연(C.Y.Won),배기훈(K.H.Bae) 전력전자학회 2002 전력전자학술대회 논문집 Vol.- No.-
In this paper digitally based excitation systems for the synchronous brushless generators are presented. System configuration, control functions with their structure functions are also shown<br/> The control system has two feedback loops main one based on a generator's voltage with digital controller and inner one based on excitation voltage of the exciter with analog controller<br/> Usually the generator regulation of voltage is made with transducers for the voltage measurement. This paper shows technique of measuring the voltage without harmonics affect, using Park's equation transformation.
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홍순중,김동억,강동현,김진진,강정균,이경환,모창연,류동기,Hong, S.J.,Kim, D.E.,Kang, D.H.,Kim, J.J.,Kang, J.G.,Lee, K.H.,Mo, C.Y.,Ryu, D.K. 국립한국농수산대학교 교육개발센터 2021 현장농업연구지 = Journal of practical agricultural resear Vol.23 No.2
농경지, 농기계, 농작업자 간 IoT 등의 통신 기술을 이용한 유기적인 정보교환을 통해 생산성, 효율성, 수익성을 높이는 지능형 데이터 농업 형태인 커넥티드 팜이 상용화 단계에 있다. 본 연구는 지능형 농업기계의 교육과정과 농업기계 안전교육 성과지표를 개발하고자 ICT, 로봇, 인공지능 등 첨단 기술을 적용한 농업생산의 무인화 및 고효율화 변화에 따른 농업기계의 특허 동향을 조사 분석하였다. 노지용 자동화 기술과 관련해서 미국, 일본, 유럽, 한국의 특허 건수는 각각 541건, 326건, 128건, 85건으로 미국에서의 특허 활동이 가장 활발한 것으로 나타났고, 일본, 유럽, 한국의 순으로 조사되어 한국에서의 농업 자동화 기술이 선진국에 비해 뒤쳐져있는 것으로 조사되었다. 노지 자동화 기술의 세분기술 분야로 보면, 경로 생성 및 추종 기술, 환경 인식을 통한 작업기 제어 기술, 로봇 농작업 시스템 설계 기술, 작물 및 환경 센싱 기술, 수확량 및 품질 모니터링 기술 분야 순으로 출원 점유율이 높은 것으로 나타났다. The connected farm that agricultural land, agricultural machinery and farmer are connected with an IoT gateway is in the commercialization stage. That has increased productivity, efficiency and profitability by intimate information exchange among those. In order to develop the educational program of intelligent agricultural machinery and the agricultural machinery safety education performance indicator, this study analyzed patent trends of agricultural machine with unmanned technology used in agriculture and efficiency technology applied advanced technologies such as ICT, robots and artificial intelligence. We investigated and analyzed patent trends in agricultural machinery of Korea, the USA and Japan as well as the countries in Europe. The United States is an advanced country in the field of unmanned technology and efficiency technology used in agriculture. Agricultural automation technology in Korea is insufficient compared to developed countries, which means rapid technological development is needed. In the sub-fields of field automation technology, path generation and following technology and working machine control technology through environmental awareness have activated.
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능동 클램프 ZVS 플라이백 컨버터의 역률개선에 관한 연구
최태영(T.Y.Choi),안정준(J.J.Ahn),류동균(D.K.Ryu),이우석(W.S.Lee),원충연(C.Y.Won),김수석(S.S.Kim) 전력전자학회 2001 전력전자학술대회 논문집 Vol.2001 No.7
This paper analyzed PFC of active clamp ZVS flyback converter by adding two method PFC (Power Factor Correction) circuit - Two-Stage and Single-Stage.<br/> It improves on Flyback converter's disadvantage - loss increasing by switching, noise increasing, high voltage stress of switch - by adding active clamp circuit. Simulation results show to improve the input PF of 300W ZVS flyback converter by adding Single-Stage, Two-Stage PFC circuit.
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김정한,류동균 安東大學 1998 安東大學 論文集 Vol.20 No.1
The present research has been made the administration policy on social athletics in Korea, with the following result. 1. The direction of the policy in social athletics has been inconsistent with every new government. 2. There is no connection or cooperation between the central and the local government. 3. The demand for non-commercial athletics facilities is urgent. 4. The budget ratio allotted for athletics is relatively small. 5. The social status of the athletics leaders needs to be improved with the policy and support from the government. 6. Various athletic programs should be developed and distributed. 7. The regulations on social athletics should be revised in the direction for national health.
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