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Promoting Effects of Soybean Methanol Extract on the Melanogenesis and Tyrosinase Activity
이재순,김영철,이복순 대한미용학회 2013 대한미용학회지 Vol.9 No.4
The promoting effect of soybean (Glicine maxim) methanol extract (GMME) on the melanogenesis and tyrosinase activity was investigated in melan-a cells, and 3-isobuty-1-methylxanthine (IBMX) was used as positive control (PC). In antioxidative ability analysis, GMME was found to contain 53.7 mg/g of polyphenol and 62.7 mg/g of flavonoid in total. Electron-donating abilities of BHT and GMME at 1,000 μg/mL were 68.4% and 14.4%, respectively. In morphological observation of melan-a cells, as the treatment concentration increased, more dendritic development and melanin accumulation observed. Melanin contents of GMME and IBMX treatment groups were significantly (p⁄0.001) higher by 51.2% and 31.6% at the concentration of 12.5 μg/mL, respectively, compared to the control group. Intra-cellular tyrosinase activities of GMME and PC treatment groups were significantly (p⁄0.001) higher by 90.0% and 54.1% at the concentration of 12.5 μg/mL, respectively, compared to the control group. Cell-extracted tyrosinase activities of GMME and PC treatment groups were higher by 12.5% (p⁄0.01) and 27.2% (p⁄0.001) at the concentration of 12.5 μg/mL,respectively, compared to the control group. GMME showed a promoting effect on melanogenesis and tyrosinase activity. From these results, it can be speculated that GMME could be applied to improve hair graying.
이재순,오동훈 서울시립대학교 도시과학연구원 2012 도시과학국제저널 Vol.16 No.1
Housing quality has been drawing people’s attention due to recent changes in the housing market as well as an increasing interest in the quality of living in Korea. For the first time, this study uses the PIF (Perfect Information Frontier) to analyse the housing market. This study aims to objectively evaluate housing quality and provide information on housing choices by using PIF to analyse highrise apartments (and condominiums) that are representative housing types in Korea. For the purpose of this paper, we developed a quality measurement model comprising both the quantitative quality and the perceived (qualitative) quality so we could consider the comprehensive housing features based on the opinions of 44 real estate professionals. The subjects of this study included 20 apartment complexes with 31 to 33 pyeong (1 pyeong ¼ 3.3 m2) apartments in Bundang New Town within the Seoul metropolitan area. Based on objective evaluation standards extracted from the model, we measured the quantitative quality. We also obtained the PIF using four types of market prices: transaction price and transaction price per pyeong, as well as monthly rent and monthly rent per pyeong. Each of these is an important factor that objectively measures and evaluates the quality of the target apartments. The perceived quality was assessed through studies of both consumers and brokers. The models and the PIF tools used in this paper could be applied to cities and countries such Singapore or Hong Kong; in fact, many developing countries constructing numerous apartment complexes within a relatively short period of time could benefit from this study.
간격이 균일한 수평타원 환상공간에서의 자연대류에 관한 이론적 연구
이재순,서정일 대한기계학회 1984 대한기계학회논문집 Vol.8 No.4
본 연구에서는 열전달계수의 이와같은 변수의 영향에 대하여 연구하였다. 그리고 이론적 연구가 수행되지 않는 기하학적 형태에 대한 열전달 계수의 Rayleigh수 와 간격비 및 Prandtl수에 관한 간단한 상관관계식을 제시하였다.