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김진석(J. S. Kim),김현수(H. S. Kim) 한국자동차공학회 1996 한국자동차공학회 춘 추계 학술대회 논문집 Vol.1996 No.6_1
In this paper, a MPT(multi pass transmission) consisting of CVT, planetary gear, brake and clutch was designed in order to increase the speed ratio range while limiting the torque transmitted through CVT. The MPT is operated in two-mode, (1)MPC and (2) CVT mode. Simulation results showed that the MPT vehicle has better acceleration<br/> performance and fuel economy compared with those of CVT vehicle.<br/>
김진석(J.S.Kim),김원(W.Kim),정용호(Y.H.Chung),정순배(S.B.Chung),김영덕(Y.D.Kim),김현수(H.S.Kim) 한국자동차공학회 1995 한국자동차공학회 춘 추계 학술대회 논문집 Vol.1995 No.11_1
Power flow characteristics of a hydro-mechanical transmission system(HMT) were investigated for tracked vehicle. in steering. A HMT consisting of two hydrostatic pumpㆍ motors(HST), several planetary gear trains and steer differential gear was considered. In order to obtain the direction and magnitude of the power flow of the HMT, network theory for the general power transmission was used. Network model for the HMT in steering was developed, which consisted of shafts, nodes and transmission elements such as clutch, gear, etc. Power flow analysis procedure consists of two stages: (1) traction force analysis in steering, (2) power flow analysis in HMT. Torque and Speed of every transmission element of the HMT was determined from network analysis. Also, efficiency, mechanical and hydraulic power loss including HST, were obtained. In addition, the regenerative power flow resulting from steering can be studied in graphic display. The power flow analysis program(PCSTEER) developed in this work can be used as a useful design tool for the tracked vehicle with HMT.<br/>
김진석(J.S. Kim),김한수(H.S. Kim),이동윤(D.Y. Lee),이석우(S.W. Lee),강은구(E.G. Kang) 한국생산제조학회 2011 한국생산제조시스템학회 학술발표대회 논문집 Vol.2011 No.4
In recently, trends of the miniaturization of micro parts machining pattern by laser machining methods have been emerged. However, the conventional laser processing methods have limitations on the resolution. So, e-beam process has been considered as alternatives. Especially, e-beam lithography has been taken accounted of tools for micro and nano pattern. But e-beam lithography equipment have some disadvantages such as lower productivity and smaller processing area etc. than other micro parts machining tools. Therefore we have carried out the development of micro column electron beam lithography equipment for achieving the more higher productivity, lager processing area, and also higher resolution. And then we tried to develop e-beam lithography system with micro column type and using wafer lens for multi column e-beam lithography system and modular e-beam lithography unit. In this paper, we developed the electro static lens system, composed of accelerator lens, condenser lens, objective lens, beam blanker, stigmator and deflector.