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國內産 茶葉의 유리아미노산, 데아닌, 카테친 含量에 관한 硏究
朴章鉉(Jang-Hyun Park),金廣植(Kwang-Sik Kim),金冑,喜(Ju-Hee Kim),崔炯局(Hyoung-Koog Choi),金善雨(Sun-Woo Kim) 한국차학회 1996 한국차학회지 Vol.2 No.2
The contents of total free amino acid, theanaine and catechin were analyzed and compared in tea shoot of native korean tea plant (Camellia sinensis var. sinensis) picking from thirteen places and Yabukita(Camellia sinensis var. yabukita), and excellent Japanese variety. Results of this investigation are summarized as follow. The content of total free animo acid of the Yabukita(2376mg/100g) was higher than that of the average of native korean tea plants(1947mg/100g). The content of total free amino acid of Hadong - gun and Tamyang - gun was higher than that of the average of other districts. Theanine content among free amono acids was the highest as 1281 mg/100g in Yabukita and the average content of wild varieties was 1060 mg/100g. The contents of catechin at Koksong - gun was the highest as 12.56%, and that of Yongkwang - gun was the lowest as 8.83%. The main ingredients had order of (-)EGCG > (-)EGC > (-)ECG > (-)EC >(+)C.
金宣祐,崔訓,南廷勳,尹順鍾 弘益大學校 科學技術硏究所 2005 科學技術硏究論文集 Vol.16 No.-
In this paper, we present the results of an experimental investigation pertaining to the mechanical properties of polyvinyl chloride pipe (PVC pipe) which is widely utilized in the sewage and waste water drainage system. PVC pipe has superior characteristics such as high corrosion resistance against various chemicals, no electrical conductivity and electrical corrosion, high strength and stiffness per unit weight, etc. Due to the above mentioned characteristics, in recent years, many developed countries (including Japan, USA, Europe, etc.) are adopting as a major material for the sewage and waste water drainage system. In order to promote wide variety of utilization in the Korean market, appropriate quality of PVC pipe must be maintained and provided to the design and construction engineers. Several PVC pipe samples were taken and relevant tests were conducted to investigate the quality, i.e., mechanical properties, according to the associated test specifications. The results of experimental investigations are presented and discussed.