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허혈이 유발된 흰쥐 해마에서 Norepinephrine 유리에 미치는 Adenosine 수용체의 역할
정종훈,최봉규,Chung, Jong-Hoon,Choi, Bong-Kyu 대한약리학회 1996 대한약리학잡지 Vol.32 No.2
The effects of adenosine analogues on the electrically-evoked norepinephrine(NE) release and the influence of ischemia on the effects were studied in the rat hippocampus. Slices from the rat hippocampus were equilibrated with $0.1{\mu}M$ $[^3H]-norepinephrine$ and the release of the labelled product, $[^3H]-NE$, was evoked by electrical stimulation(3 Hz, 2 ms, 5 $VCm^{-1}$ and rectangular pulses for 90 sec), and the influence of various agents on the evoked tritium-outflow was investigated. Ischemia(15min with 95% $N_2$ +5% $CO_2$) increased both the basal and evoked NE release. These increases were abolished by addition of glucose into the superfused medium, and they were significantly inhibited either by $0.3\;{\mu}M$ tetrodotoxin pretreatment or by removing $Ca^{++}$ in the medium. MK-801$(1{sim}10\;{\mu}M)$, a specific NMDA receptor antagonist, and glibenclamide $(1\;{\mu}M)$, a $K^+-channel$ inhibitor, neither alter the evoked NE release nor affected the Ischemia-Induced increases in NE release. However, polymyxin B(0.03 mg), a specific protein kinase C inhibitor, inhibited the effect of ischemia on the evoked NE release. Adenosine and $N^6-cyclopentyladenosine$ decreased the NE release in a dose-dependent manner in ischemic condition, though the magnitude of inhibition was far less than those in normal (normoxic) condition. Also the treatment with $5{\mu}M$ DPCPX, a potent $A_1-adenosine$ receptor antagonist did not affect the ischemia-effect. These results suggest that the evoked-NE release is potentiated by ischemia, and this process being most probably mediated by protein kinase C, and that the decrease of NE release mediated through $A_1-adenosine$ receptor is significantly inhibited in ischemic state.
녹차음료 가공공장의 모델개발 및 경제성 분석(Ⅱ) : 경제성 분석
鄭琮薰(Jong-Hoon Chung),殷鍾邦(Jong-Bang Eun),朴根亨(Keun-Hyung Park) 한국차학회 1996 한국차학회지 Vol.2 No.2
The estimation of total investment cost, the prime cost and analysis of economical efficiency were required for investigating the validity on the construction of a green tea beverage plant. The fixed capital required for the operation of the plant were estimated, and the prime cost of a can green tea was analyzed with the productive year. Then, the economic efficiency of the plant such as net present value, return on investment, profitability index and pay-back period were analyzed under the plant sale price of 250 Won/can. The results are summarized as follows: 1. The fixed capital for the plant was 2.12 billion Won and the working capital (20% of annual operating cost) was 0.37 billion Won. Therefore, total investment cost was estimated to be about 2.5 billion Won. 2. The prime cost of a can green tea was 210 Won/can in the lst year, 195 Won/can in the 2nd year, 184 Won/can in the 3rd year, 176 Won/can in the 4th year, 170 Won/can in the 5th year. 3. The prime cost of a can green tea in the 1st year was composed of 31% fixed cost and 69% floating cost, but the fixed cost gradually decreased by 13% in the 5th year. Also, the prime cost of 210 Won/can was composed of production cost of 174 Won and management cost of 36 Won. 4. The yearly net profit per a can green tea was highly like 40 Won/can in the 1 st year, 45 Won/can in the 2nd year, 56 Won/can in the 3rd year, 74 Won/can in the 4th year, 80 Won/can in the 5th year based on the assumption of the plant sale price of 250 Won/can. 5. In the analysis of economic efficiency, the return on investment and the profitability index were respectively 17% and 16% in the 1st year, 28 and 23 in the 2nd year, 43% and 32% in the 3rd year, 63 and 43 in the 4th year, 91% and 48 in the 5th year. And the pay-back period was 3.7 years under consideration of depreciation cost, while 3.5 years under no consideration of depreciation cost based on the 15% coporation tax. 6. The construction of a green tea beverage plant was finally proven to be validated as the results were highly positive in the survey of preference and market on the green tea and in the analysis of the economic efficiency on the beverage plant.
선수의 스포츠경험이 자아동일성에 미치는 영향에 관한 연구
정종훈(Chung Jong-Hoon),김유수(Kim Yoo-Soo),이진숙(Lee Jin-Suk) 동아대학교 스포츠과학연구소 2005 스포츠科學硏究論文集 Vol.23 No.-
This paper aims at revealing the feature of sport experience in relation to the process of athletes" ego identity formation viewed from Erikson"s mutuality concept. The phases of mutuality was operationally defined as crisis, exploration and commitment. 164 male college athletes in the physical education department who have been involved in competitive sports since pre-adolescence volunteers as subjects, Two questionnaires were given to these subjects. One of them was a scale of the ego identity formation; crisis, exploration and commitment. Then, the level of three states were evaluated by the degree of subjects; interaction with thirteen areas in their life space; six sporting, six daily life and one area in common. The construction of this scale was based on the idea of Marcia"s identity status approach and the operational definition of "mutuality". The following are the conclusions of this study. In general, athletes were strongly involved in the sports-related areas, especially revealing high levels in the three aspects about athletic achievements. Exploration and commitment were lower than crisis in such areas as teammates, continuity of sports career, leaders, and sex. Exploration was lower in such areas as jobs and ways of life plus senses of values. In self-identity formation processes, exploration and commitment were supporting the sense of self-identity. In addition, athletes showed similar tendencies like other youths in the areas of self-identity achievement motivation. Sports achievements, continuity of sports career, and leaders were related, but these areas were not large enough to contribute to the sense of self-identity. That is, they were difficult to proceed in Erikson" s concept of reciprocity.