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A Study on Hot Open Die Forging Method of Blade Cylinder Root Using AA 5083 Cast Alloy
권용철(Yong Chul Kwon),윤영섭(Young Sub Yoon),강종훈(Jong Hun Kang) Korean Society for Precision Engineering 2019 한국정밀공학회지 Vol.36 No.6
The blade cylinder root is a key component connecting the blade and pitch bearing of a wind turbine and is 20% of the blade’s manufacturing cost. Blade cylinder roots are manufactured using the open die forging method with steel alloy. However the blade cylinder root for 750 KW class wind turbine is manufactured using AA5083 cast material to reduce weight. The purpose of this study is to develop a hot open die forging method, through experiment and FEA, using AA5083 material manufactured by continuous casting. The forging process was designed using the mandrel forging method. Hot compression tests were conducted to obtain flow stress of cast microstructure at different temperatures and strain rates. Control parameters of each forging process were analyzed/compared to predict adaptability of the mandrel forging process. High productivity, good internal quality, shapes, and dimension were verified by prototypes manufactured by the proposed forging process.
박근태 ( Gun Tae Park ),김영훈 ( Young Hoon Kim ),조현석 ( Hyun Seok Cho ),김정미 ( Jung Mee Kim ),윤영섭 ( Young Sub Yoon ),김진배 ( Jin Bae Kim ),이오영 ( Oh Young Lee ),최호순 ( Ho Soon Choi ),이민호 ( Min Ho Lee ),최윤영 ( Yoo 대한소화기기능성질환·운동학회 2003 Journal of Neurogastroenterology and Motility (JNM Vol.9 No.1
목적: 간경변 환자는 흔히 오심, 식욕부진, 소화불량, 복부팽만 등의 소화기 증상을 호소한다. 이러한 증상은 간경변 환자에서 자주 볼 수 있는 위궤양이나 위염 같은 합병증과 연관될 수도 있지만 기질적 병변없이 위운동 기능의 변화로 생길 수도 있다. 간경변 환자에서의 위 운동 변화에 대해선 논란이 많고 현재 국내에서는 이에 대한 연구가 미흡한 실정이다. 이에 저자들은 간경변 환자들에서 위 운동의 실질적 변화와 이에 영향을 미치는 요인들을 알아보고자 하였다 Background/Aims: Changes in gastric motility in patients with liver cirrhosis is not yet established in South Korea. In this study changes in gastric emptying time with attention to factors that effect this change in patients with liver cirrhosis were inv
尹英燮 이화여자대학교 한국문화연구원 1966 韓國文化硏究院 論叢 Vol.8 No.-
The complex metal hydrides are among the recently developed inorganic compounds for which wide application in the organic field has been found. Among these, hydrides, lithium aluminum hydrides, (referred to as LAH), is an extremely powerful reducing agent. It reacts violently with water causing the liberation of hydrogen and decomposition of any water soluble compound. It reacts readily and, in many cases quantitatively, with substances soluble in ether such as diethyl ether and tetrahydro furan. Under conditions similar to those used with the Grignard reagent. Functional groups which have resisted other chemical reactions have successfully been reduced with LAH. The action of LAH is often highly specific, yielding products of a high degree of purity due to the absence of side reactions, condensations and cleavages often encountered with other reducing agents. The author has discussed the effect of LAH on organic compounds with special emphasis on its powerful reducing action.
發芽大豆油의 脂肪酸에 대한 分析과 그의 Gas-Liquid Chromatogram에 관한 硏究
尹英燮 梨花女子大學校 韓國生活科學硏究院 1972 韓國生活科學硏究院 論叢 Vol.8 No.-
The Gas-Liquid chromatograms of fatty acids in germinated soybean oil were investigated. The main component of fatty acids were found to be palmitic acid 11.2% ; stearic acid 2.8% ; oleic acid, 23.8% ; linoleic acid, 55.8% and linolenic acid, 6.7% ; as the average values of four samples of germinating soybeans respectvely. In the germination of soybeans the increased contents of the unsaturated fatty acids were found to be about 2% by weight.