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주원경(W.K. JOO),김형진(H.J. KIM),조기연(K.Y. CHO),박상욱(S.W. PARK),조명국(M.K. CHO) 대한기계학회 2013 대한기계학회 춘추학술대회 Vol.2013 No.12
In this study, bead portion is one of the most important part on the tire construction because the bead have to bear the head and contact pressure against the rim. Usually bead profile is designed to allow for the shape of rim. But the more compression between a bead and a rim is the better. This thesis shows that the optimized design of bead profile for better matching and compression between a bead and a rim.
소프트 스위칭 Single Stage AC/DC Full Bridge Boost 컨버터
김은수(E. S. Kim),조기연(K. Y. Joe),김윤호(Y. H. Kim),조용현(Y. H. Cho),박경수(G. S. Park),안호균(H. G. An),박순구(S.G.Park) 전력전자학회 1999 전력전자학술대회 논문집 Vol.1999 No.7
A new soft switching single stage AC-DC full bridge boost converter with unit input power factor and isolated output is presented in this paper Due to the use of a non-dissipative snubber on the primary side, a single stage high-power factor isolated full bridge boost converter has a significant reduction of switching losses in the main switching devices, The non-dissipative snubber adopted in this study consists of a snubber capacitor Cr. a snubber inductor Lr, a fast recovery snubber diode Dr, and a commutation diode Dr, This paper presents the complete operating prin챠ples, theoretical analysis and experimental results.
유동욱(D.W.Yoo),정창용(C.Y.Jeong),백주원(J.W.Baek),조정구(J.G.Cho),조기연(K.Y.Cho),김학성(H.S.Kim),원충연(C.Y.Won) 전력전자학회 1998 전력전자학술대회 논문집 Vol.- No.-
A precision high voltage generator for ion injection is implemented on HFZVS-PSCI (Phase-Shift-Controlled Inverter). Some practical aspects of implementing precision high voltage generator with HFZVS-PSCI, such an a HFHV transformer, multiflier, and precision CR divider are fast dynamic response, low ripple voltage, and high accuracy.<br/> <br/>
김태진(T.J.Kim),변영복(Y.B.Byun),조기연(K.J.Joe),조상명(S.M.Cho),김철우(C.U.Kim) 전력전자학회 2002 전력전자학술대회 논문집 Vol.- No.-
Joining thin aluminum alloy is difficult using most welding techniques Many of problems associated burn-through by the high heat input Common welding techniques are TIG, MIG, and MIG-PULSE welding The VP-GMA W provides more control of the heat balance m the welding arc by taking advantage of the different arc characteristics obtained with each of the two polarities.<br/> In this paper, we proposed new VP GMA Welding method by control DSP 320C32, and the characteristic and experiment result-voltage, current, welding bead, penentraion by this method are presented
단상 역율개선형 Single-Stage AC/DC Forword Converter
김태진(T.J.Kim),김은수(E.S.Kim),조정구(J.G.Cho),변영복(Y.B.Byun),조기연(K.Y.Joe) 전력전자학회 2000 전력전자학술대회 논문집 Vol.2000 No.11
기존의 역률보상회로가 별도의 전력변화단을 가지고 있어 소자수가 많아지고 복잡한 하드웨어 구성을 가지고 있는 단점이 있다. 본 논문에서는 별도의 전력변환단을 가지지 않고 PFC기능을 가지는 단일 전력단(Single-Stage) 단상 AC/DC Forward Converter에 대하여 실험하여 검증하였다.