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정진일,민승식,노미정,박유신,남궁석 한국법과학회 2002 한국법과학회지 Vol.3 No.1
As the use of preservatives in foods has been increased, the misuse and overuse of preservatives are occasionally occurred. As the variety of food has risen, it is necessary to establish the screening method to determine preservatives in various foods. In this study, benzoic acid, sorbic acid, methyl p-hydroxybenzoate, ethyl p-hydroxybenzoate, i-propyl p-hydroxybenzoate, n-butyl p-hydroxybenzoate were analyzed by TLC and HPLC. In order to determine the recoveries from food, these preservatives were spiked into foods. As a result, solvent systems of 8:2:0.45:0.05 and 12:2:0.45:0.05 of pentane:acetic acid:chloroform:ethanol were appropriate for TLC analysis of preservatives. All preservatives were well resolved with solvent system of 2% ammonium acetate in 2.5% acetic acid:methanol (90/10~10/90) by HPLC. Direct extraction of preservatives from food proved to be more proper than distillation and extraction method. The recoveries by direct extraction method showed 93.7~104.6% of preservatives studied.
비만 개선 효과를 지닌 탄수화물 및 지방 흡수 억제 기능성 식이조성물 개발
윤유식,최선미,홍순복,홍정미,김정원,이홍석,홍성길 한국조리과학회 2002 한국식품조리과학회지 Vol.18 No.3
In a previous study, we developed a new food additive as an egg yolk antibody (IgY) against carbohydrate digestion enzymes for the regulation of blood glucose level and weight control. The IgY delayed and decreased the increment of blood glucose level after administration of sucrose in human being by 30% in 20∼30 min. We also developed a lipase inhibitor as a water extract of two kinds of herb, Platycodon grandiflorum and Solanum melongena. Twenty three volunteers were subjected to the intake of the egg yolk IgY plus the herbal extracts for 50 days. In average, the treated subjects appeared to lose 1.96 ㎏ of body weight and 3.4 ㎏ of body fat mass during the treated period. Furthermore, Panniculus adiposus and breech size were significantly decreased during the experimental period. Above results suggested that the administration of the dietary additives composed of egg yolk IgY and natural herbal extract improve the obesity by the decrement of body weight and body fat mass.
인공 산성비 용액 함침 및 경사평면법에 의한 옥외용 실리콘 고무의 열화 특성 평가
김정호,정규원,유영식,양계준,박용관 成均館大學校 科學技術硏究所 1999 論文集 Vol.50 No.1
We investigated the effect of acid rain on the surface aging, and resistance to tracking and erosion of silicone rubber materials : First, we measured the contact angle, SEM, EDX, and weight reduction to investigate the surface aging caused by immersion in the artificial acid rain solution. From the results of a series of experiments, we concluded that the acid rain attacked the base polymer of the surface, and lead to the depolymerization. Second, we adopted Inclined-Plane Method to measure the resistance to tracking and erosion of silicone rubber, and rather not observably affected the immersed specimen in the tracking resistance than in the erosion resistance.
누설전류 파형 측정에 의한 실리콘 고무의 표면 열화 평가
김정호,정규원,서광석,유영식,박용관 成均館大學校 科學技術硏究所 1999 論文集 Vol.50 No.1
In this study, we investigated the erosion resistance of the silicone rubber by measuring leakage current with Inclined-Plane Method. From the results of our study, it was observed that the typical leakage current waveform was the mixed figure of sinusoidal wave and rectifying wave. And, it is considered that the former is due to conductivity of the contaminant when the surface is wet, and the latter is due to the arc discharge of dry band. And, as the surface erosion is being accelerated, the proportion of the rectifying wave is increasing. And, the ratio of discharge duration to discharge-extinguish time changes and can be divided into three regions, which is similar to the changes of erosion depth and width. Therefore, it can be known that the erosion process has some correlation with the change of leakage current.
박춘식,장정욱,유기재,최성민 國立 昌原大學校 産業技術硏究所 2002 産技硏論文集 Vol.16 No.-
This Study investigated a possibility of lateral movement in the reconstruction field of Nongso bridge at Nongso-ri, Joochon-myeon, Kimhae. The methods applied in this study were the judgement formula and the Finite Element Method(FEM). The conclusions are shown in the following. 1) The application of the FEM, as well as the judgement formula resulted in the lateral movement. 2) Bridge abutment and foundation must be constructed after completing consolidation. 3) The occurrence possibility of lateral movement should be judged by the FEM that can re-present field conditions. 4) Lateral movement will take place in the case. Hence, settlement of proper countermeasure method should be followed by the construction.
寒蘭組織培養에 있어서 Rhizome의 生育과 Shoot 分化에 관한 硏究
沈慶久,柳美先,李貞植 成均館大學校 科學技術硏究所 1986 論文集 Vol.37 No.1
This study was carried out to accelarate the growth of rhizome and shoot formation of Cymbidium kanran. Rhizome used as materials were prepared by seed strile culture and rhizome-tips were placed on the basal medium (Murashige & Skoog) which were supplemented with growth substances. The results obtained were summarized as follows: 1. Shoot formation at the rhizome-tips was the best in the media supplemented with 0-0.1mg/l BA. Rhizome growth was stimulated in the media supplemented with 0.1mg/l NAA and 4-8mg/l BA. 2. When organic matters were added to basal medium, a noticeable promotion of rhizome growth was observed in the medium containing activated charcoal. 3. The growth of rhizom was promoted when 4% sucrose, 3g/l pepton, or 4g/l yeast extract were added to basal medium. 4. Incorporation of 1.0mg/l BA and 10^-3M L-arginine, L-aspartic acid stimulated shoot formation remarkably under light condition. 5. Growth of rhizome according to light or dark treatment was better under dark than under 16hr illuminated light condition and the rhizome cultured under dark condition was more effective for shoot formation.