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Direct Laser Melting 공정시 차폐가스가 성형 특성에 미치는 영향
한상욱(S. W. Han),신세계로(S. G. R. Shin),신은경(E. K. Shin),이철환(C. H. Lee),문영훈(Y. H. Moon) 한국소성가공학회 2013 한국소성가공학회 학술대회 논문집 Vol.2013 No.5
Direct Laser Melting process is a kind of prototyping process whereby a 3-D part is built layer wise by laser scanning the powder. This process is highly influenced by shielding gas and laser parameters such as laser power, scan rate, layering thickness and rescanning. Especially, shielding gas is important in evaluating the microstructure and mechanical properties. In this study, fabrication was carried out by experimental facilities consisting of a 200W fiber laser. Cylinder was fabricated by shielding gas atmosphere such as Air, Ar and N₂ with Fe-Ni-Cr powder to investigate forming characteristics. Although surface properties was improve, surface roughness was similar without significant change. In order to evaluate the formability, flow stress curves were analyzed. The microstructure is different by scan rate and rescanning.
광역 전력계통 감시를 위한 상위 Master System 설계
김상태(S.T. Kim),이정현(J.H. Lee),김지영(J.Y. Kim),이동철(D.C. Lee),문영환(Y.H. Moon),김태현(T.H. Kim),윤재영(J.Y. Yoon),김동준(D.J. Kim),이병준(B.J. Lee),한상욱(S.W. Han),남해곤(H.K. Nam),심관식(K.S. Sim),이승재(S.J. Lee),진보건(B.K. Jin) 대한전기학회 2006 대한전기학회 학술대회 논문집 Vol.2006 No.11
In this paper, the master system of Wide Area Monitoring System in order to prevent reaching a fault influence toward power system is proposed. This system has three real time algorithms and a on-line one using i-piu transfer data and provides operators with various understandable monitoring viewers in HMI based on raw data and algorithm results.