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바이어스 스퍼터링 법으로 제조된 LiCoO<sub>2</sub>박막 I. 전기화학적 특성
이영재,박호영,조병원,조원일,김광범,Lee, Y.J.,Park, H.Y.,Cho, W.I.,Cho, B.W.,Kim, K.B. 한국전기화학회 2003 한국전기화학회지 Vol.6 No.4
박막전지의 제조공정 중 열처리 공정은 많은 문제점들을 가지고 있다. 본 연구에서는 열처리 공정 없이 박막의 구조변화를 유발하는 바이어스 스퍼터링(Bias sputtering) 방법으로 $LiCoO_2$ 양극 활물질 박막을 제조하여 그 특성을 고찰하였다. 제조된 박막은 다양한 분석 방법을 이용하여 결정구조, 표면형상, 방전용량을 관찰하였다, 제조된 $LiCoO_2$양극활물질 박막 중 -50 V의 기판 바이어스 전압$(substrate\;bias\;voltage:\;V_b)$을 인가하여 제조된 $LiCoO_2$ 양극 활물질 박막에서 약 $60{\mu}Ah/cm^2{\mu}m.$의 초기 방전 용량을 가짐을 확인하였다. 본 연구는 열처리 공정 없이도 박막전지의 양극활물질로서 $LiCoO_2$ 박막을 사용할 수 있음을 알 수 있었다. The heat treatment process of thin film microbatteries manufacturing processes has several Problems. This study, without heat treatment, considered the characteristics of $LiCoO_2$ thin films deposited by bais sputtering method inducing the structural change of the thin film. The properties of deposited $LiCoO_2$ thin films such as crystal structure, morphology, and discharge capacity were observed by various analysis methods. Among $LiCoO_2$ thin films deposited by substrate bias $voltage(V_b)$, the one deposited by substrate bias voltage of -50V had the highest initial discharge capacity of about $60{\mu}Ah/cm^2{\mu}m.$ We confirmed that $LiCoO_2$ thin film could be used as cathode material of lithium thin film microbatteries without annealing.
[전기·전자] 열전변환 적용을 위한 가솔린차량의 전력 및 배열에너지 분석 연구
이영재(Y.J.Lee),표영덕(Y.D.Po),고창조(C.J.Koh),김강출(G.C.Kim),권오석(O.S.Kwon) 한국자동차공학회 1999 한국자동차공학회 춘 추계 학술대회 논문집 Vol.1999 No.11_2
About 70% of energy input to internal combustion engine is rejected to atmosphere by heat. By utilizing this waste heat, a plenty of energy can be conserved in nationwide. One of possible ways is the thermoelectric generation to utilize engine's waste heat to provide auxiliary electric power. Under this concept. KIER has been developing the thermoelectric generation system to replace the alternator by converting the waste heat in the engine's exhaust directly to electricity, This system may reduce the shaft horse power of the engine. then improves the vehicle fuel economy and the exhaust emissions, This paper describes the preliminary study in which characteristics of the electric energy and exhaust heat energy in city and highway mode driving conditions are analysed. These results would be used to determine the optimum design parameters of the thermoelectric generation system.
주조용 A356 합금의 피로 변형 거동에 미치는 기공 및 열처리의 영향
이영재(Y. J. Lee),김선호(S. H. Kim),어광준(K. J. Euh),조규상(K. S. Cho),이기안(K. A. Lee) 한국소성가공학회 2011 한국소성가공학회 학술대회 논문집 Vol.2011 No.5
The effect of heat treatment on the high-cycle fatigue behavior of A356 casting aluminum alloys was investigated in this study. Microstructure examination, tensile and high-cycle fatigue test were conducted on both Al-Si-Mg casted (F) and heat-treated (T6) conditions. The high-cycle fatigue results indicated that the fatigue strength of the A356-T6 alloy was higher than that of the A356-F alloys. The SEM fractography results showed that porosity affected detrimental effect on the fatigue life: 79% of all tested samples fractured as a result of porosity which acted as the main crack initiation site. It was found that fatigue life decreased as the size of pore increased. The mechanisms of fatigue crack initiation and propagation of A356 alloy, which is correlated with pore and microstructure, was also discussed.
이영재(Y.J.Lee),김강출(G.C.Kim),권오석(O.S.Kwon),김종필(J.P.Kim),고창조(C.J.Koh),박선(S.Park),방효선(H.S.Bang),한정옥(J.O.Han) 한국자동차공학회 1998 한국자동차공학회 춘 추계 학술대회 논문집 Vol.1998 No.11_1
Natural gas is one of the most promising alternative fuels for automotive vehicles. However, natural gas varies in composition between the originating fields and may be further modified due to processing and additional mixing. These variations are known to affect engine performance and emissions through changes in fuel metering and combustion characteristics.<br/> In the present study, it was examine the effect of gas compositions on vehicle performance such as fuel economy, driveability and exhaust emissions. Analysis are made of using 3 types of NGVs which was made by auto maker and 6 different fuels which are selected in consideration of the variation in fuel composition on the worldwide market. These results may be utilized to develop natural gas engine in auto maker and/or to establish the fuel standard in the refuelling station.<br/>
극소형 위성발사를 위한 공중발사 로켓 미리내Ⅱ의 시스템 설계
이영재(Y-J Lee),김진호(J-H Kim),최영창(Y-C Choi),이재우(J-W Lee),변영환(Y-H Byun),이창진(C. Lee) 한국항공우주학회 2005 韓國航空宇宙學會誌 Vol.33 No.12
최근 활발한 연구가 진행 중인 공중발사 방식은 극소형 위성을 매우 저렴한 비용으로 발사할 수 있는 효율적인 방법이다. 본 연구에서는 비교적 단순한 임무를 수행할 수 있는 나노 위성을 공중발사 방식을 이용하여 원 궤도에 올릴 수 있는 공중발사 로켓 시스템설계와 각 단별 계통 설계를 수행하였다. 이를 위하여 공중발사 로켓 시스템의 WBS와 각 계통별 작동개념도를 정립하였고, 이를 바탕으로 시스템 세부형상과 DMU를 구현하였다. Air-Launching is an effective method that can launch the 'Nanosat' with low launching cost. In this study, system and subsystem design of the air launching rocket for nanosats which perform a simple mission, have been performed. For this purpose, the WBS of the MIRINAEⅡ, and the subsystem schematics have been defined first. Based on these results, detailed configuration and DMU have been developed.