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Poly(ethylene oxide)/Poly(ε-caprolactone) 혼성체로부터 Bioactive Agent의 방출 거동에 관한 연구
유영태,허정림,정채열 건국대학교 1995 學術誌 Vol.39 No.2
Poly(ε-caprolactone)/poly(ε-caprolactone)-b-poly(ethylene oxide) hybrid membranes were used for the zeroth order release of lyophobic drug. Diffusivity of the drug increased with the copolymer content of the blend and the release rate was inversely proportional to the thickness of the membrane. The effective diffusivity of the drug was estimated as 1.07×10-3mm2/hr, 1.27×10-3mm2/hr and 1.83×10-3mm2/hr for the membranes containing 37.5wt% of PCL-PEO-PCL block copolymers with compositions of 20k-20k-20k, 15k-15k-15k and 6k-6k-6k, respectively.
이정길,손덕수,이우영,유중학,임경화 한국공작기계학회 2004 한국공작기계학회 춘계학술대회논문집 Vol.2004 No.-
There was not the evident analysis about the cutting process of CNC machining, and wouldn't be difficult to estimate the result of machining for the various cutting conditions. Therefore they were not founded the systemic technology about the optimum cutting conditions and selection of cutting tools. So this study have investigated the common facts for needs through the end-mill cutting machining by Machining-Centers or High-speed cutting machines, and developed the user-centered intelligent decision system to selection of the methodology about cutting conditions to improve the machining efficiency of end-mill cutting process.
산란광 광량 적산식 Digital Dust Indicator에 의한 도서관과 학생회관내 PM_(10) 농도의 일변화
김만구,권영진,정영림 江原大學校 附設 環境硏究所 1997 環境硏究 Vol.14 No.-
Diurnal variation of PM_(10) concentration was investigated for 24 sites in library including reading room, bookstock room, lobby, office and so on, and 9 sites in student building at Kangwon National University using scattering light integrated type digital dust indicator. The dimensional conversion factors for mass concentrations(K) were determined by comparing between the PM_(10) concentrations collected by PM_(10) high volume air sampler and the digital dust indicator. The dimensional conversion factor(k) was 3.33 for indoor air in this experiment. The higher concentrations were 649㎍/㎥day for smoking room in the library 242㎍/㎥/day for circle room in the student building. Most of spaces in the library except a office and bookstock rooms were over 150㎍/㎥/day of PM_(10) concentrations and 6 indoor spaces were over the guideline for indoor air quality in student building except a health center and two restaurants. Therefore, in should be required to make an improvement in the indoor air quaility for public facilities in the university buildings.
도시 생활폐기물 매립장이 주변 환경에 미치는 영향 - 대기 중 휘발성 유기화합물의 변화
김만구,정영림 강원대학교 부속 환경연구소 2004 Journal of the Environment Vol.1 No.-
Most of municipal solid wastes have been disposed of by landfill, 51.4% on 1999, in Korea. The organic compounds emitted from landfill are variable depending on the types of wastes but the organics from landfill are known as cause of greenhouse effect, photochemical smog and as harmful for human health. However, most of studies concerned in landfill site were performed after the construction of landfill without measurement of volatile arganic compounds before the construction. Therefore, the objectives of this study was to investigate the variation of VOCs in the ambient air at the landfill site, located at Hyuldong-Li, Chunchon, Korea, between before and after landfill. The Hyuldong-Li municipal sanitary landfill have constructed from June 1997 and started landfill from January 1998. The VOC samples were collected from February 1997 to October 2000. Samples were collected from three sites every two weeks using adsorvent tubes which are 100㎜ long packed with Tenax-GR. Collected VOCs were analyzed using cryofocusing GC/FID/FPD quantitatively and identified using cryfocusing GC/MS. The concentration of VOCs showed remarkable change between before and after landfill in ambient air. The highest concentration of toluene, p-xylene, styrene and dimethy1 disulfide were 79.2㎍/㎥,38.8㎍/㎥, 21.7㎍/㎥ and 21.8㎍/㎥, respectively. Concentrations of total hydrocarbons calculated as the equivalent of toluene ranged from 1.5 to 112.4 ppbC. The highest concentrations of VOCs were appeared during the period of rubbish transfer from the temporary landfill site.
PM_(10) 개인노출과 공중이용시설내 농도에 관한 연구
김만구,정영림,임양석 江原大學校 附設 環境硏究所 1998 環境硏究 Vol.15 No.-
PM_(10) concentrations were measured measured in underfround stores located in 4 major cities, Chuchon, Wonju, Donghae and Sockcho, in Kangwon-Do using scattering light integrated type digital dust indicator. Personal exposure to PM_(10) for two women(housekeeper and granduate stuent) and a man(undergraduate student were measured also. The dimensional conversion factors for mass concentrations(K) showed some difference among underground stores which were 2.0,2.7,3.4,2.6㎍/㎥·CPM in chunchon, Wonju, Donghae and Sockcho, respectively. Average PM(10) concentrations at underground stores were 178㎍/㎥ in Chunchon, 141㎍/㎥ in Wonju, 125㎍/㎥ in Donghe and 59㎍/㎥ in Sockcho. The portion of PM_(10) in total suspended particles was about 50~60 % as weight. The exposure of graduate student, housekeeer and undergraduate to PM_(10) during 12 hours were 1004.3(㎍/㎥)·hr, 907.0(㎍/㎥)·hr and 691.2(㎍/㎥)·hr, respectively. Personal exposure to PM_(10) showed very different according to their activity parttern and they had more than 90% of their PM_(10) exposure at indoor envirnment.
여정숙,김애정,방인수,강영림 혜전대학 식품산업연구소 2003 식품산업연구지 Vol.5 No.-
This study was carried out in order to investigate the sensory evaluation of uncooked powdered food with funtional characteristics by the addition of sericultural products. According to sensory evaluation, A company commercial goods was higher level of color, flavor, taste, texture and overall than other commercial goods. The uncooked powdered food with sericultural products was higher level of sensory evaluation than commercial goods but not significantly.
항진균물질을 생산하는 Streptomyces fimbriatus AF21-3의 분리 및 동정
장주현,김정완,이우윤,윤영준,이경림,김승곤,이태수 인천대학교 2000 基礎科學論文集 Vol.11 No.1
Actinomycetes were isolated from soil to find new antibiotics. An active antimicrobial compound was isolated from the culture filtrate of Actinomycetes AF 21-3. The Actinomycetes strain which showed strong antifungal activity against Candida tropicalis and Microsporum gypseum was identified as Streptomyces fimbriatus and named as Streptomyces fimbriatus AF 21-3.