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배성문(Sung Mun Bae),박강주(Kang Ju Park),김정목(Jeong Mok Kim),신동주(Dong Joo Shin),황용일(Yong Il Hwang),이승철(Seung Cheol Lee) 한국응용생명화학회 2002 Applied Biological Chemistry (Appl Biol Chem) Vol.45 No.2
In this study, three kinds of Saccharomyces cerevisiae strains (KCTC 7106,7238,7904) were tested with respect to the ability of alcohol fermentation at 20℃ for 3 weeks, and S.cerevisiae KCTC 7106 was the most effective strain in alcohol fermentation with sweet persimmon. To increase the utility of sweet persimmon, the fruits stored for 1 year were used to make an alcohol beverage. It was adjusted 25% of total sugar content and allowed alcohol fermentation with shaking at 120 rpm and 30℃. The alcohol content of 11.6% sbowed at 15 days and it did not change until 25 days. The initial pH of the fermentation was near 5 then decreased to 4 within 5 days and the initial vitamin C content, 5.04 ㎍ /㎖, gradoally decreased with fermentation periods. In the other study,the alcohol fermentation from fresh harvested persimmons showed 13% alcohol content at 20℃ for 30 days without agitation, white the alcohol content of the fermentation at 30℃ was 11.8% at 25 days and 13.4% at 35 days.
질화처리가 금형펀치(SKH51)의 마모 특성에 미치는 영향
배대성(Dae-Sung Bae),조상철(Sang-Chul Jo) 산업기술교육훈련학회 2009 산업기술연구논문지 (JITR) Vol.14 No.1
Recently, as the component industry has grown up with the high technology, metallic pattern is needed to have special properties such as precise processing, heat resistance, wear resistance, fatigue resistance and mass product. For these reason, high speed steels with good physical and mechanical properties is favored in the making of the metallic pattern. This study is focused on examining the micro-structure of nitrided case and relationship variation of hardening and wear behavior generated by vacuum heat treatment to grasp the properties of high speed steel for metallic pattern. Also, to understand the effect of ion nitriding for wear resistance of high speed steels the experiment to examine how much microstructure of nitrided layer and hardness variation affect on the wear behavior was conducted according to the ion nitrided treatment and behavior of compound layer and precipitation layer constituting nitrided layer. The results of experiment are as follows: The optimal austenitizing temperature reached at 1250℃ under the condition of the hardness value and surface of roughness in 1,170 ℃ and absorption energy showed 1,170℃ in the case of 1,100℃. Ion nitrided specimen, under these experimental condition, shows the existence of the area of two phases with matrix and carbides and also shows the value of W, Mo, Cr and V components higher in these area. The ruling wear mechanism turned out to be adhesion wear before ion nitriding specimen to be tempered repeatedly twice after quenching and sub-zero treatment but it is abrasive wear and the wear resistance is more enhanced after that process.
배성의 ( Sung Eui Bae ) 한국농촌지도학회 2009 농촌지도와 개발 Vol.16 No.2
The objectives of this study were finding out some methods about development of oversea agriculture in Korea. It is a tough task that faces us now. China is a big agricultural country, most agricultural investment country and the nearest located in Korea. So this study researches on the quality of farmers and characters of rural human resources in China. In China, agriculture industry is the basic industry among national economy developments. The majority of populations in China are living in rural region. Agriculture, villages and farmers are main issues in China. From this point, An analysis of Chinese farmers` characters and qualities; general conditions of farmers` knowledge of science and technology, their education level, quality of minds and sprit, and rural public health service situation in China. The result of this study is following; First, Chinese farmers` factors that low education level, big cultural differences between cities and country sides affect the development of China`s agriculture as obstruction factors. Second, Practice conditions of farmers` science knowledge and technology are low level, output of higher rural human resources, low quality of minds and sprit and problems of agricultural extension service. It is negative influenced of agriculture and farmers economic development in China. Third, unsociable culture of the peasantry influences Chinese farming in the negative ways. Also, conventional notions of family are getting weaker, it makes connection of the kinship weaken. But, Chinese think that this kind of kinship is the most important thing in their life. Fourth, in the case of situations that the farmer`s sanitation and health, low level of the medical service is getting worse than before relatively. And there are a lot of discordances between a planned childbirth policy and personal recognitions. Also, lacking of nourishment makes labor productivity falling tendencies. The medical industry falls short of the standard as compared to the number of farming people. Fifth, in the peasantry`s consciousness of the legal system, this causes difficulties to farmers in the market. Shortage of the legal knowledge exerts a bad influence upon rural economy.