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김재훈,김민,김병식 한국공업화학회 2003 응용화학 Vol.7 No.1
Bovine serum albumin(BSA) as a chiral ligand was captured uniformly throughout a porous hollow-fiber membrane at a level of 250mg/g by the polymer chains grafted onto the membrane. Subsequetly, crosslinking of BSA with a 0.05%(w/w) of glutaraldehyde in a Tris-HCL buffer (pH 8) for 5 h was effective in stabilizing the amount of BSA immobilized at a level of 200 mg/g. A solution of 이-Tryptophan in Tris-HCI buffer asa mobile phasa permeated the crosslinked-BSA multilayered membrane. Therefore on experimentation is BAS immobilized hollow fiber is applicable for the chiral separation of enantiomers in a mobile phase with various pH values and organic modifiers.
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Glutaraldehyde로 가교시킨 BSA고정막에 의한 DL-Tryptophan의 흡착특성
김재훈,김민,김병식 한국공업화학회 2004 응용화학 Vol.8 No.1
A DEA group-containing polymer chain grafted onto a porous PE membrane. BSA was immobilized by the permeation of a BSA solution through the pore of the DEA membrane. The immobilized BSA was cross-linking with glutaraldehyde to prevent leakage. DL-tryptophan solution was forced to permeate through the BSA immobilized membrane at a flow 50mL/h. As a result, Adsorption of D-L-tryptophan increase with increasing of BSA immobilized as a function of the degree of GMA grafting.
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김재훈,김민,김병식 한국공업화학회 2004 응용화학 Vol.8 No.2
Anion exchange groups(DEA) were introduced into porous hollow fiber membranes by radiation-induced ploymerization. A DEA group-containing polymer chain grafted onto a porous PE membrane. The BSA solution was forced to permeate across the hollow fiber DEA membrane. BSA was immobilized by the permeation of a BSA solution through the pore of the DEA membrane. The immobilized BSA was cross-linking with glutaraldehyde to prevent leakage. Afterwards, The GA 0.05 percent membrane having higher adsorption capacity than 0.025, 0.075, 0.1 percent GA concentration.
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방사선 그라프트 중합법에 의한 이온교환재료의 포름알데히드 흡착
김재훈,김민 한국공업화학회 2005 응용화학 Vol.9 No.1
Anion exchange groups were introduced into an existing microfiltration membrane by radiation-induced grafting polymerization and subsequent chemical modification. Glycidyl methacrylate(GMA) was grafted onto the porous polyethylene hollow-fiber membrane. The epoxy group produced in the GMA-grafted hollow fiber was converted into anion-exchange groups by reaction with diethylamine(DEA), hydroxylamine(HA) and Triethylamine(TEA). Subsequently, HA membrane adsorption of formaldehyde better then DEA, TEA membrane.
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김재훈,김민,김병식 한국공업화학회 2003 응용화학 Vol.7 No.2
Anion exchange groups were introduced into porous hollow fiber membranes by radiation-induced ploymerization. The epoxy group produced in the GMA-grafted hollow fiber membrane was converted into anion-exchange groups by reaction with Diethylamine(DEA). Triethylamine(TEA). Ethanolamine(EtA). Diethanolamine(DEtA). The D-, L-Tryptophan solution was forced to permeate across the hollow fiber DEA, TEA, EtA, DEtA memberan. When measurements of anion-exchange capacity of the DEA, TEA, EtA, DEtA memberan, the DEA membrane having higher adsorption capacity than TEA, EtA, DEtA membrane.
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알콜과 담배가 Streptococcus mutans의 자당발효에 미치는 영향에 관한 연구
김재훈 韓國保健敎育學會 1990 보건교육건강증진학회지 Vol.7 No.2
Streptococcus mutans 10449 was cultured in sucrose-containing BHI broth with ethyl alcohol of different concentration from 1% to 18%. The pH of culture media was from pH 7.00 to pH 5.00. Tobacco smoke and tobacco extract were also used. Ethyl alcohol began to inhibit sucrose fermentation by S. mutans at 2% and completely inhibited it between 9% and 18%. The lower the pH of media was, the stronger the inhibition of ethyl alcohol became. 9% Ethyl alcohol completely inhibited sucrose fermentation by S. mutans below pH 5.50. Inhibition by tobacco extract was obvious, but it did not inhibit the growth of S. mutans also. Therefore, the increase of caries activity in drinkers and smokers could be the result of indirect effect of alcohol and tobacco by oral ecology, behavior, or systematic course, rather than the result of direct effect of alcohol and tobacco to plaque bacteria and their metabolism.
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邕章祐,金載勳,朴昞俊 충남대학교 공업교육연구소 1986 論文集 Vol.8 No.3
It has been very important to evaluate the J_IC in Elastic-Plastic Fracture toughness test and to develope the certain method that we can precisely obtain the J_IC from any material. In this study, R-curve Method, Stretch Zone Method, and Ultrasonic Method are used to evaluate the J_IC of Aluminums, i.e., Al 2024, Al 5083, Al 7075. The echo energy of Ultrasonic Method increased rapidly in the unstable crack growth stage and then it is decreased at less rapidly slope. Therefore, the value of J_IC exists between linearly decreased region and the point of deviation. J_IC can be obtained precisely by Stretch Zone Method and approximately obtained by Ultrasonic Method. Stretch Zone Method can be used to evaluate J_IC very quantitively, but we have the trouble with the method in measurement. Ultrasonic method is required that the research for the more exact evaluation about correlation between echo energy and the crack openning behavior of precrack tip will be continued.
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