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- 저자 : 박인환(I. H. Park) (검색결과 5 건)
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박인환(I.H.Park),최영태(Y.T.Choi),전영식(Y.S.Jeon),최승복(S.B.Choi),정재천(C.C.Cheong) 한국자동차공학회 1995 한국자동차공학회 춘 추계 학술대회 논문집 Vol.1995 No.11_1
This paper presents the performance investigation of an engine mount featuring an ER (Electro-Rheological) fluid. The Bingham properties of the ER fluid to be employed to the ER engine mount are experimentally obtained through Couette type viscometer. The governing equation of motion of the ER engine mount is derived using equivalent hydraulic model. The ER engine mount is then designed and manufactured on the basis of parameter studies. The electric field-dependent transmissibility of the ER engine mount is evaluated by changing the particle concentration of the ER fluid.<br/>
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UV-254 nm Light 가 병원 내 공기오염에 미치는 영향
변미라 ( M R Byun ),정병천 ( B C Jeung ),용미선 ( Ms Yong ),김성일 ( S I Kim ),박인환 ( I H Park ) 대한임상검사과학회 1992 대한임상검사과학회지(KJCLS) Vol.24 No.1
An individual may be increased risk of acquiring an infectious disease either because of inherent host factors, such as age and illness or environmental factors. Among the exogenous causes, especially the mode of airborne transmission in hospital infection, the authors observed the effects of UV -254 nm light on air contaminants in the intensive care unit by performing colony counts and Gram stain. The mechanism of action of UV -254 nm light on air contaminants is known to be the destruction of the microbial genetic material such as DNA and/or RNA. The results of reducing the air contaminants through the UV -254 nm light in the intensive care unit show the destruction of a broad spectrum of pathogenic and apportunistic microorganisms as follows: 1. The effect was began from one hour after exposure of the UV -254 nm light device and low coloy counts were maintained constantly up to the 12th day. 2. The UV -254 nm light was most effective in crowded conditions of the intensive care unit. 3. Among the microorganisms, the device especially reduced the colony counts of Staphylococcus species.
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PVC 및 Olefin계 Copolymer의 열안정성에 관한 연구(Ⅰ) : 제조 및 내열성 Preparation and Heat Resistance
맹기석,송해영,박인환,황택성,민병철 충남대학교 공업교육연구소 1986 論文集 Vol.9 No.1
In order to improve the heat stability of poly(vinyl chloride), copolymerization of PVC and olefin was performed and the thermal properties of the copolymer was investigated. PVC-olefin copolymers with various olefin contents were prepared by a typical suspension polymerization method at 50℃. It was found that both the degree of conversion and molecular weight decreased as the comonomer ratio (olefin/VCM) in the copolymer was increased. Thermal analysis showed the higher content of olefin reduced the glass transition temperature(Tg) of the copolymer while the heat stability of the copolymer remained almost unchanged in terms of the initial decomposition temperature which is about the same as that of homo PVC. On the other hand, TGA analysis showed that the weight loss became smaller as the comonomer ratios of olefin was increased even though the molecular weight of the copolymer is lower. The polyene sequence distribution in the copolymer degraded at 120℃ was studied by UV-visible spectroscopy. It showed a trend that the amount of long polyene sequence increases at first as the comonomer ratio is increased, however a further increase of the comonomer ratio reverses the trend such that the short polyene sequence is more frequently found.
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