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김두영(D.Y.Kim),김성수(S.S.Kim),송준규(J.G.Song),유규열(K.Y.Yoo),민황기(H.K.Min) 한국자동차공학회 2002 한국자동차공학회 Symposium Vol.2002 No.11
The qualities of castings are deeply influenced by the sand mold in iron casting. The strength and permeability of asnd mold are influenced by mixing conditions of sand, organic binder, non-organic binder, water and etc. This paper describes the optimized mixing conditions with robust design method.
UV 레이저를 이용한 다 층막의 선택적 직접가공 공정연구
정영모(Y. M. Jeong),안중용(J. Y. An),김두영(D. Y. Kim),백광열(K. Y. Baek),김종원(J. W. Kim),강형식(H. S. Kang),홍순국(S. K. Hong) 한국레이저가공학회 2007 한국레이저가공학회 학술대회 논문집 Vol.2007 No.-
A traditional SiNx pattern making processes require PR coating, exposure, develop, etching and PR strip. This causes high equipment cost, running cost and environment pollution. A selective layer direct patterning with mask projection method can be the good alternatives for those typical processes to overcome the above issues. The patterns on a small mask are projected onto a substrate by the almost homogenized beam of UV Excimer laser. This process can ablate only the selected layers clearly by the required depth. The experimental investigations are discussed for obtaining the optimal process condition to ablate selectively the multiple layers in this paper.
고정수(J. S. Ko),오부국(B. K. Oh),김두영(D. Y. Kim),이재영(J. Y. Lee),이승기(S. K. Lee),정수화(S. H. Jung),홍순국(S. K. Hong) 한국레이저가공학회 2011 한국레이저가공학회지 Vol.14 No.3
As an active emission display using emissive polymer has had much attention recently, needs for a selective patterning of emissive layer for those displays have been increased abruptly. Therefore, the various laser sources in terms of its wavelength has been used for laser direct patterning. In this work, the feasibility of those processes is examined using numerical analysis and the experimental investigation. A sample has multi-layered structure, emissive polymer on aluminum which is deposited on a glass substrate. Key factors for optimizing the laser patterning of the emissive polymer are considered into the control of ablation products, large-sized particle, and the choice of the appropriate wavelength for minimizing the heat affected zone and the remnant layer.