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- 저자 : 이태환(T . H . Lee) (검색결과 46 건)
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활성산소원을 이용한 핵사플로오로프로필렌 에폭사이드의 합성
이태환(T . H . Lee),우주영(J . Y . Woo),이희우(H . W . Rhee),김훈식(H . S . Kim),김홍곤(H . G . Kim) 한국공업화학회 2001 응용화학 Vol.5 No.2
Hexafluoropropylene oxide(HFPO) is a representative oxygen-containing C₃ fluoromonomer, which enhances physical and chemical properties of fluoro copolymers. It is also essentially used for manufacturing fluorinated ion-exchange membranes such as Nafionⓡ. HFPO was successfully obtained from a liquid-phase epoxidation of hexafluoropropylene with active oxygen species such as NaOCl and H₂O₂. Addition of transition metal halides to the HFP epoxidation was revealed to appreciably enhance the yield of HFPO. Among the transition metal halides used, ferric chloride showed the highest catalytic activity in the epoxidation reactions with both NaOCl and H₂O₂.
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레이놀즈수에 따른 평판 모델의 거칠기 함수에 관한 연구
정태환(T.H. Joung),이정희(J.H. Lee),김재형(J.H. Kim) 한국전산유체공학회 2016 한국전산유체공학회지 Vol.21 No.4
In this paper, turbulence models for considering roughness in the open source code(OpenFOAM) was investigated. Wall function in the RANS(Reynolds-averaged Navier Stokes) turbulence model was modified considering roughness on the flat plate by using roughness function. Correlation between the first layer height in the CFD model and roughness height of the plate was observed, and the most proper roughness function, and the first layer height from the plate wall in the CFD analysis was suggested in this paper.
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RPWM기법을 이용한 3상 승압형 컨버터 전도노이즈 저감
정태환(T.H.Jung),안정준(J.J.Ahn),이정호(J.H.Lee),원충연(C.Y.Won),김영석(Y.S.Kim),최세완(S.W.Choi) 전력전자학회 1999 전력전자학술대회 논문집 Vol.- No.-
In this paper Random PWM method for reducing conducted EMI in single switch three phase discontinuous conduction mode boost converter is presented. Random PWM control, by which the switching noise spectrum is smoothed and its level is reduced, is proprsed. Experimental results are verified by converter operating at 300V/1kw with 5%~30% white moise input.
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이태환(T . H . Lee),이희우(H . W . Rhee),김훈식(H . S . Kim),김홍곤(H . G . Kim) 한국공업화학회 2000 응용화학 Vol.4 No.2
Use of hexafluoropropylene oxide (HFPO) as a comonomer appreciably enhances physical and chemical properties of fluoropolymers. It is also essential to the preparation of fluorinated polyethers which are the major materials for manufacturing fluorinated ion-exchange membranes such as Nafion and Flemion. HFPO was successfully obtained from a liquid-phase epoxidation of hexafluoro propylene (HFP), which occurred in the surface interface between an aqueous hypochlorite and an organic solvent, 1,1,2-trichloro-1,2,2-trifluoroethane (F-113), containing HFP. Yield and production rate of HFPO increased along with the initial concentration of NaOCl. The yield of HFPO also changed with the ratio of NaOCl to F-113 and with types and concentrations of sulfactant.
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Cu와 DyF<sub>3</sub> 분말의 혼합이 Nd-Fe-B 소결자석의 보자력에 미치는 영향
남궁석,이민우,임태환,김태훈,이성래,장태석,NamKung, S.,Lee, M.W.,Dhakal, D.R.,Lim, T.H.,Kim, T.H.,Lee, S.R.,Jang, T.S. 한국분말야금학회 2012 한국분말재료학회지 (KPMI) Vol.19 No.4
Effect of Cu and $DyF_3$ powder mixing with Cu-free (Nd, Dy)-Fe-B jet-milled powder on the magnetic properties of sintered magnets was investigated. The coercivity of a magnet prepared from the Cu-free (Nd, Dy)-Fe-B powder was about 10 kOe even though the alloy powder already contained some Dy (3.5 wt%). When small copper powder was blended, however, the coercivity of the magnet increased almost 100%, exhibiting about 20 kOe. On the contrary, the coercivity enhancement was moderate, about 4 kOe, when dysprosium content in the sintered magnet was simply increased to 4.9 wt% by the addition of small $DyF_3$3 powder.
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