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폴리머 Devolatilization을 위한 기포 성장 모델의 수치 연구
유홍진 순천향대학교 부설 산업기술연구소 1998 순천향 산업기술연구소논문집 Vol.4 No.1
등온 조건하 폴리머-용매 계에서의 기포성장에 대해 유도된 수학적 모델의 수치해를 컴퓨터 모사에 의해 구하였다. 기포 성장에 영향을 미치는 무차원 매개변수 값들의 변화에 의해 기포 반지름을 시간의 함수로 나타내었으며 문헌에 나타난 실험적 현상들과 비교적 잘 일치하였다.
유홍진 순천향대학교 부설 산업기술연구소 1995 순천향 산업기술연구소논문집 Vol.1 No.2
Adsorption equilibrium isotherms for pure CO² were studied at 293-323 K and 0.1-15 atm because these can play a key role in developing a PSA process. Volumetric method was used for the collection of adsorption isotherm data and domestic and foreign activated carbons were used as adsorbents. Adsorbed amount decreases as temperature increases and increases as pressure increases.
유홍진,한성록 한국산학기술학회 2004 한국산학기술학회논문지 Vol.5 No.2
미세기공 중공사형 모듈을 비분산 막-용매 추출에 의하여 유기오염물을 폐수로부터 분리하였다. 시스템은 향류 및 병류로 각각 진행되었으며, 분배계수의 비교로부터 MIBK가 분리용 용매로 선정되었다. 향류의 분리도가 병류보다 우수하였으며, 총괄물질전달계수도 구하였다. Organic pollutants (Phenol, 2-Chlorophenol, Nitrobenzene) were separated from wastewater by nondispersive membrane solvent extraction, using a microporous hydrophobic hollow fiber module. The system was operated countercurrently and cocurrently with the aqueous phase flowing through the fiber lumens and the solvent flowing through the shell side. The distribution coefficients of several solvents (MIBK, IPAc, Hexane) were examined and MIBK was selected as an extracting solvent. Separation efficiency of countercurrent flow method was better than that of cocurrent flow method. Also, the overall mass transfer coefficients were determined.
산업폐수로부터 유기오염물 제거를 위한 막-용매 추출에 관한 연구
유홍진 순천향대학교 부설 산업기술연구소 1997 순천향 산업기술연구소논문집 Vol.3 No.2
Phenol was extracted from aqueous solution into methyl isobutyl ketone (MIBK) by membrane solvent extraction, using a microporous hydorphobic hollow fiber module. The system was operated counter-currently and corruently with the aqueous phase flowing through the fiber lumens and the solvent flowing through the shell side. The results in this study suggest that membrane solvent extraction can be a technically and economically feasible means for selective removal of organic pollutants from industrial waste streams.
유홍진 순천향대학교 부설 산업기술연구소 1998 순천향 산업기술연구소논문집 Vol.3 No.3
Adsorption rates for pure CO₂and N₂were studied at 313 and 343 K because these can play a key role in designing a PSA bed. TGA(thermogravimetric analysis) technique was used for the collection of adsorption rate data and domestic-and foreign-produced activated carbons were used as adsorbents. Adsorption rates of CO₂were much faster than those of N₂.
유홍진,정인호 한국공업화학회 1999 응용화학 Vol.3 No.1
Organic pollutants were extracted from aqueous solutions into methyl isobutyl ketone (MIBK) by membrane solvent extraction, using a microporous hydrophobic hollow fiber module. The system was operated countercurrently with the aqueous phase flowing through the fiber lumens and the solvent flowing through the shell side. The distribution coefficient of phenol was measured for solvents and MIBK was used as a extracting solvent. Concentrations and percent removal of organic pollutants in the exit phase from the HFM were studied.
유홍진,김동학,장석원,김태완 한국산학기술학회 2004 한국산학기술학회논문지 Vol.5 No.2
Nano size 몰드의 제작은 X-ray lithography 방법을 이용하여 몰드를 제작하고, micro size의 경우 Deep UV lithography 방법을 이용하여 몰드를 제작하고 있다. 본 연구에서는 SLS(Selective Laser Sintering)형 RP(Rapid Prototyping System)을 이용하여 미세구조 몰드를 제작하였으며, 패턴의 깊이는 400 ㎛까지 구현하였다. 제작된 몰드의 강도와 내열성을 높이기 위하여 전해도금을 이용하여 몰드의 표면에 Ni를 300 ㎛생성 시켰다. By this time, a mold with nano size pattern was produced using a fabrication of X-ray lithography method and in a m icro size's case it was produced using fabrication of Deep UV lithography. In this paper, we produced mold with 400 $\mu{m}$depth pattern using a new technology of SLS(Selective Laser Sintering) Rapid Prototyping method. In addition to enhance strength and thermal stability, we produced Ni structure with a thickness of 300 $\mu{m}$ on a surface of mold using electro forming method.