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남기대,최재효,김상춘 충북대학교 산업과학기술연구소 1991 산업과학기술연구 논문집 Vol.5 No.1
The shortage of water resources is expected to be more serious with the rapid increase in population and the industrialization. Many darns have been constructed and several downs is scheduled to construct additionally for the increased water demand, however, it is hard to guarantee safe water supply due to the local hydrologic characteristics. Water conservation is a desirable alternative for deficit water resources. Water conservation can also reduce the quantity of wastewater as well as energy, which results the reduction of environmental impact loads. Various water conservation technologies have been developed and some are avaible to use in buildings and houses. The important things for water conservation as of today are to develop water conservation plans, and programs. It is to be desired that central and local government should encourage the construction and water facility companies and private consumers to participate in water conservation programs by giving them a special favors of financing or tariff.
남기대,김상춘,최재효 ( Ki Dae Nam,Sang Chun Kim,Jae Hyo Choi ) 한국유화학회 1993 한국응용과학기술학회지 Vol.10 No.1
Recent studies on enzyme reactions in organic solvents are revived. The reactions are classified into three categories : heterogeneous, biphasic and homogeneous systems. The following subjects are described and discussed about the heterogeneous system. 1) The maximal expression of enzyme activity in organic solvents in terms of water content, hydration of enzyme, and equilibrium of water between enzyme and substrate solution. 2) Solvent effect on the catalytic power of enzyme. 3) Thermostability and thermoreactivity. 4) Applications of the enzyme reactions to synthetic chemistry.
전기증착법으로 제조된 다공성 텅스텐 산화물의 고대비 전기변색 특성
박성혁,모호진,임재근,김상권,최재효,이승현,장세화,차경호,나윤채,Park, Sung-Hyeok,Mo, Ho-Jin,Lim, Jae-Keun,Kim, Sang-Gwon,Choi, Jae-Hyo,Lee, Seung-Hyun,Jang, Se-Hwa,Cha, Kyung-Ho,Nah, Yoon-Chae 한국분말야금학회 2018 한국분말재료학회지 (KPMI) Vol.25 No.1
In this study, we synthesize tungsten oxide thin films by electrodeposition and characterize their electrochromic properties. Depending on the deposition modes, compact and porous tungsten oxide films are fabricated on a transparent indium tin oxide (ITO) substrate. The morphology and crystal structure of the electrodeposited tungsten oxide thin films are investigated by scanning electron microscopy (SEM) and X-ray diffraction (XRD). X-ray photoelectron spectroscopy is employed to verify the chemical composition and the oxidation state of the films. Compared to the compact tungsten oxides, the porous films show superior electrochemical activities with higher reversibility during electrochemical reactions. Furthermore, they exhibit very high color contrast (97.0%) and switching speed (3.1 and 3.2 s). The outstanding electrochromic performances of the porous tungsten oxide thin films are mainly attributed to the porous structure, which facilitates ion intercalation/deintercalation during electrochemical reactions.