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무전해 도금법을 이용한 전자소재용 은-구리 복합분말의 제조
윤치호,안종관,김동진,손정수,박제신,안양규,Yoon, C.H.,Ahn, J.G.,Kim, D.J.,Sohn, J.S.,Park, J.S.,Ahn, Y.G. 한국분말야금학회 2008 한국분말재료학회지 (KPMI) Vol.15 No.3
Silver coated copper composite powders were prepared by electroless plating method by controlling the activation and deposition process variables such as feeding rate of silver ions solution, concentration of reductant and molar ratio of activation solution $(NH_4OH/(NH_4)_2SO_4)$ at room temperature. The characteristics of the product were verified by using a scanning electron microscopy (SEM), X-ray diffraction (XRD) and atomic absorption (A.A.). It is noted that completely cleansing the copper oxide layers and protecting the copper particles surface from hydrolysis were important to obtain high quality Ag-Cu composite powders. The optimum conditions of Ag-Cu composite powder synthesis were $NH_4OH/(NH_4)_2SO_4$ molar ratio 4, concentration of reductant 15g/l and feeding rate of silver ions solution 2 ml/min.
이진우(J. W. Lee),윤치호(C. H. Yoon),박종명(J. M. Park),최영도(Y. D. Choi),이영호 (Y. H. Lee) 한국동력기계공학회 2009 한국동력기계공학회 학술대회 논문집 Vol.2009 No.11
The development of lifting pumps that lift minerals to a mining vessel are one of the vital parts of the commercial mining process. Lifting pumps with a high total head are needed as lifting pumps transfer minerals from the deep sea to a waiting vessel. Accordingly, when we designed the lifting pumps we needed to design the centrifugal pump with a high total head. However, that kind of pump has a small specific speed and it created a small passageway, so they had a problem transferring the minerals. Therefore, we designed a mixed flow pump which has a wider passage way for minerals to flow. Technology to design the pump requires a lot of experience, so more research into how the pump operates is necessary. In this research, I examined the internal flow of the pump by CFD to gather basic information for developing the pump's performance.
박용찬(Park Y.C.),윤치호(Yoon C.H.),유동근(Yoo D.G.),이동길(D.G. Lee),김영주(Kim Y.J.),성원모(Sung W.M.),강성길(Kang S.G.) 한국해양환경·에너지학회 2005 한국해양환경공학회 학술대회논문집 Vol.2005 No.11
CO₂ emission from burning fossil fuels has been identified as the major contributor to the increase in atmospheric CO₂ levels that can potentially lead to global climate change. In the last decade, there has been worldwide concern on possible global warming caused by heat being trapped by CO₂ in the upper atmosphere (the green-house effect). Allover the world, there is a growing tendency to exploit clean energy as well as to control fossil fuels for the sake of diminishing the gases that cause the greenhouse effect. However, to satisfy the regulations that have become strengthened for the gas reduction, it is necessary to sequestrate as well as to capture and collect carbon dioxide. In general, storage sites for carbon dioxide can be divided into two categories: geological sites and deep ocean. In this paper, sequestration methods in geological strata will be discussed.