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향류식 역삼투공정에 의한 상용막의 에탄올 농축 특성에 관한 연구
진병복,이병철,민병렬 연세대학교 산업기술연구소 1993 논문집 Vol.25 No.2
0The concentration characteristics for reverse osmosis and countercurrent reverse osmosis process with varing concentration of ethanol solution and applied pressure were investigated in this study. Also, the theoretical value derived for countercurrent reverse osmosis(Osmotic sink reverse osmosis) were compared with the experimental results. In RO and CCRO experiments, three kinds of commercial membrane(TFCL, UOP Co., U.S.A./FT-30, Film Tec Co., U.S.A. / Cellulose Acetate blend, UOP Co., U.S.A.), applied pressure of 3.92, 4.9 MPa and feed concentration of 3.9, 10.2 wt% were used. From the results of this study. DC(Degree of Concentration) of ethanol by TFCL membrane was the highest value of three kinds of membrane, and DC of ethanol by OSRO was the highest value of two types of ethanol concentration process. In addition, DC of OSRO more increased greately than that of RO as applied pressure difference increased. In comparison with experimental and numrical results, the numerical results were accorded with experimental results within 5-13% of error.
중국 덕주 지역의 구순구개열 의료 봉사 활동 보고 및 치험례 발표
이원덕,이부규,최진영,김종렬,오용석,민병일,김명진,Lee, Won-Deok,Lee, Bu-Kyu,Cho, Jin-Young,Kim, Jong-Ryul,Oh, Yong-Seok,Min, Byoung-Il,Kim, Myung-Jin 대한악안면성형재건외과학회 2009 Maxillofacial Plastic Reconstructive Surgery Vol.31 No.5
Il Woong Cleft lip and palate foundation was founded in 1968 by Professor emeritus Byoung-Il Min. Since then the foundation has operated numerous cleft lip and palate patients not only in Korea but also in under-developed countries such as Vietnam, China, and Cambodia. In December 2005, the foundation was allowed as an incorporated association by Ministry of Foreign affairs and Trade, so that it could have official status. From March 6th 2009 to March 14th 2009, we conductp,d charity cleft lip and palate operations of 23 patients in areas of Deozhou, China. Hereby we present the results of operations.
역삼투막을 이용한 해수담수화시 온도 및 농도변화에 대한 투과수, 용질 거부도에 관한 연구
민병렬,김재선 연세대학교 산업기술연구소 1986 논문집 Vol.18 No.1
This study is concerned with the effect of temperature and feed concentration on the efficiency of desalination utilizing Reverse Osmosis. Extensive study state Reverse Osmosis data are collected for the salt solution using Cellulose Acetate membrane at the constant pressure of 13㎏/㎠. The variation in the solute rejection coefficient. R. with temperature is minimal. However pure water permeability. Lp. increases linearly with an increase of temperature. Increase in feed concentration causes decrease in rejection coefficient. R. and pure water permeability. Lp. This empirical results indicate that it is possible to achieve higher efficiency in desalination by Reverse Osmosis at lower feed concentration and higher temperature. Experimental results follow Kedem-Katchalsky model which predicts the linear relationship between inverse of rejection coefficient. 1/R, and inverse of total volume flux, 1/Jv.
조병희(Byoung-Hee Jo),정민석(Min-Suk Jung),류상률(Sang-Ryul Ryu),김승호(Sung-Ho Kim) 한국정보과학회 2004 한국정보과학회 학술발표논문집 Vol.31 No.1A
VOD, HDTV, 라이브 스트리밍 등의 서비스가 늘어나면서 FTTH(Fiber To The Home)의 고비용과 설비 문제를 해결하기 위한 대안으로 PON(Passive Optical Network)이 부상하고 있다. 가입자망의 구조가 다양하게 진화하고 광 이더넷 기술이 발전하면서 가입자에게 최적의 대역폭을 할당하기 위해 서비스별 대역 폭 할당방식이 요구된다. 따라서, 본 논문에서는 사용자의 대역폭 요구에 따라 OLT(Optical Line Termination)가 각 ONU(Optical Network Unit)에게 서로 다른 방식으로 대역폭을 파장별로 적절하게 할당하는 파장 다중 분할 Ethernet PON모델에서 스트리밍 서비스를 위한 모델을 제시하고 구현한다. 또한, 이더넷 지연에 대한 분석을 통해 모델의 효율성을 제시한다.