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수용성 고분자를 이용한 항균 필름의 제조 및 특성 연구
최준호 ( Jun Ho Choi ),최유성 ( Yoo Sung Choi ),오일홍 ( Il Hong Oh ),김맹수 ( Maeng Su Kim ),이인화 ( In Hwa Lee ) 한국화학공학회 2011 Korean Chemical Engineering Research(HWAHAK KONGHA Vol.49 No.4
This study was performed to develop antimicrobial films using polyvinyl alcohol and methyl cellulose. Methyl cellulose and polyvinyl alcohol films plasticized with PEG(polyethylene glycol) were prepared by solvent casting process under addition of 0.025~1.0 wt% ampicillin and 0.1~1.0 wt% streptomycin as an antimicrobial agent. The mechanical properties of prepared films were examined by universal testing machine(UTM). Tensile strength of methyl cellulose films was 15.44~21.70 N/mm2. Tensile strength of PVA(15 wt%) film was 20.2~51.5 N/mm2, and the tensile strength of the antimicrobial films were decreased linearly with increasing the antibiotic loading amount up to 1 wt%. Antimicrobial activities of PVA and methyl cellulose films containing ampicillin and streptomycin through the disc diffusion test for the Staphylococcus aureus and Escherichia coli. The antimicrobial activity of methyl cellulose films and PVA containing ampicillin were higher than that of containing streptomycin methyl cellulose films. The results indicate the films may be a proper materials for antimicrobial packing applications.
매립가스 마이크로가스터빈 배가스 분석에 관한 실험적 연구
박정극(Park, Jung-Keuk),허광범(Hur, Kwang-Beom),임상규(Rhim, Sang-Gyu),오일홍(Oh, Il-Hong),이인화(Lee, In-Hwa) 한국신재생에너지학회 2011 신재생에너지 Vol.7 No.3
MGT fuelled by landfill gas was tested to asses feasibility of its exhaust gas application for CO₂ enrichment. The exhaust gas was analyzed during start-up and normal operation with different MGT load conditions. Due to the changes of air/fuel ratio and combustion mode, O₂, CO₂, CO and NOx concentration were varied within wide ranges during the MGT start-up. Especially, NOx emissioin level was increased up to 20.01 ppmv. Different tendencies of O₂, CO₂, CO and NOx concentrations were observed with MGT output changes. O₂ and CO concentrations were shown to be decreased and NOx and CO₂ concentrations were shown to have opposite trends. NOx emission level (0.8~1.88 ppmv) was very low compared to other types of combustion based power generation equipment. Unburned hydrocarbon emission level was substantially decreased with MGT load increase. Especially, C₂H₄ concentration was below the detection limit(0.2 ppmv) around the nominal load condition. The exhaust gas from landfill gas fuelled MGT system was shown to be feasible for CO₂ fertilization. Concentrations of major components were within or below the maximum allowable ranges.