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21C 未來 LEISURE SPORTS 事業의 展望 : SPORTS CENTER를 中心으로
김진환,송병문 경원전문대학 1996 論文集 Vol.18 No.1
88 올림픽 성공이후 정부차원의 국민체육 진흥에 부응하여 스포츠센타 사업이 활성화 되면서 국내굴지의 그룹들이 레져스포츠 사업진출에 박차를 가하고 있다. 그러나 일부기업에서는 스포츠쎈타 사업을 수익성이 높고 쉽게 운영할 수 있는 업종으로 보고 있지만 실제로는 사업운영에 있어 위험부담이 따르는 사업이라 할 수 있다. 따라서 본 논문에서는 국내외 스포츠쎈타의 현황 및 대기업의 사업진출 방향과 일본과 미국의 스포츠사업의 발전경위 등을 문헌조사하여 21C 미래 레져스포츠 사업을 전망하였다
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비점성 대류 방정식의 계산을 위한 Hermitian 요소의 사용에 대한 고찰
김진환 東義大學校産業技術開發硏究所 1993 産業技術硏究誌 Vol.7 No.-
The use of Hermite cubic element, as a possible shock capturing finite element computation, has been investigated. The shock capturing technique is indispensable for the computing of supersonic flow field. The present paper reveals some results for the hermite cubic element for both linear and nonlinear scalar one and two dimensional cases. In one dimensional case, the numerical results by the hermite cubic element shows somewhat better than those by the linear element, and particularly the steady state result by the hermite cubic element shows a high resolution-like one. This seems to be in the superiority of hermite cubic element in the space differencing. In two dimensional case, the results by the hermite cubic element seem to possess a boundary instability, and this may be overcome through the use of higher order time differencing method.
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Catecholamine과 금속이온의 킬레이트제가 synaprosome의 Na^+-K^+ ATPase의 활성도에 미치는 영향
김진환,이정수,이광수 중앙대학교 의과대학 의과학연구소 1987 中央醫大誌 Vol.12 No.2
The Na^+-K^+ ATPase activity of the synaptic membranes appears to have an important role in the regulation of neurotransmitter release and uptake. Although it is well known that stimulate the activity of neuronal membrane Na^+-K^+ ATPase, the mechanism by which catecholamines increase Na^+-K^+ ATPase activity is unclear. It is suggested that there is a direct linkage between adrenoceptors and Na^+-K^+ ATPase. While, some investigators reported that norepinephrine increased the activity of neurally derived Na^+-K^+ ATPase through elimination of inhibitory influence of metal ions by forming metal-norepinephrine complex. In the present study, therefore,a linkage between adrenoceptors and Na^+-K^+ ATPase or Mg^++ ATPase was studied by investigating effects of catecholamines on synaptosomal Na^+-K^+ ATPase and Mg^++ ATPase with or without antagonists for adrenoceptors. Effects of various chelating agents on Na^+-K^+ ATPase and Mg^++ ATPase activities in the presence and absence of metal ions were also examined. In addition, inhidition of ATPase by metal ions which may be associated with lipid peroxidation and action of oxygen radicals produced was investigated. Na^+-K^+ ATPase and Mg^++ ATPase activities in brain cortex synaptosomes of rat were increased by both norepinephrine and dopamine in a dose dependent manner. The effects of catecholamines on these ATPase were antagonized by yohimbine, phentolamine and propranolol. Metal ion chelators such as EDTA, DETAPAC, penicillamine and EGTA clearly increased Na^+-K^+ ATPase and Mg^++ ATPase activities with or without metal ions. Activation of these ATPases was further stimulated by catecholamines but was not affected by antagonists. When synaptosomes were incubated with Fe^++ or Cu^++, both production of malondialdehyde from synaptosomes and inactivation of ATPases were observed and these phenomena were prevented by catecholamines, DETAPAC, penicillamine, superoxide dismutase which is a scavenger of O_2 and catalase which is a scavenger of H_2O_2. The results obtained suggest that there is a linkage between α-or β-adrenoceptors and Na^+-K^+ ATPase and Mg^++ ATPase through their action on adrenoceptors. Chelating agents of metal ions showed a stimulatory effect on synaptosomal Na^+-K^+ ATPase and Mg^++ ATPase through their action on adrenoceptors. Chelating agents of metal ions showed a stimulatory effect on synaptosomal Na^+-K^+ ATPase and Mg^++ ATPase by reversal of metal inhibition of these ATPases. Catecholamines may mimic the effects of chelating agents of metal ions and regulate synaptosomal Na^+-K^+ ATPase by reliving inactivation of these ATPases or lipid peroxidation cacused by metal ions, particularly Fe^++ and Cu^++.
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Magnesium Sulfate가 微細血管吻合術에 미치는 影響
金晉煥 大韓成形外科學會 1980 Archives of Plastic Surgery Vol.7 No.1
Recent progress in microvascular surgery has opened a new clinical era in tissue transplantation and replantation by the direct anastomoses of vessels less than 1 mm in external diameter. However, in spite of continous training and the use of improved microscope, instruments, and suture, it is still difficult to obtain patency rates of 90percent. Acland, has demonstrated that topical magnesium sulfate helps prevent small vessel thrombosis by its strong antiplatelet agglutination and vasodilation effect. However, as he has pointed out , the presence of manesium sulfate causes prolonged and severe bleeding from the gaps in the suture line. Therefore, I have used silicone cuff to splint the suture line and reduce the bleeding caused by magnesium sulfate. Tubes of 1.3mm internal diameters were used and a 4mm length of the tube was then split longitudinally and applied around the suture line, before removal of the vascular clamps. In the experiment, forty Sprague-Dawley rats, weighing 250 to 300 gm, were divided into 4 equal groups. A femoral artery in each was repaired, using magnesium sulfate and the silicone cuff in Group 1 and omitting them in Group 2. a femoral vein in each was repaired, using magnesium sulfate and the silicone cuff in Group 3 and omitting them in Group 4. Ten anastomoses were done in each group. Re-exploration were carried out after 3 weeks after the operation. In Group 1, 100 percent, and in Group 2, 90 percent had patent arterial anastomossis. For the veins, 100 percent of Group 3 and 70 percent of Group 4 had remained patent.
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金珍煥 한국중국문화학회 2002 中國學論叢 Vol.14 No.-
본 논문은 전국말 법가의 집대성자인 한비의 정치사상중 "法" 의 의의에 대해 살펴보았다. 한비의 "법" 의 의의에는 크게 법률적 성격과 정치적 성격 및 사회적 성격으로 나눌 수 있다. 법률적 성격의 의의에서 주목할 만한 내용은 법의 성문. 공포성과 객관성, 공정, 공평성을 들 수 있는데 이것은 중국의 법제사상에 있어 획기적인 발전이라 할 수 있다. 정치적 성격의 의의에서는 특권제거와 인사의 제도화가 주목할 만한 내용으로 한비는 "法"을 사회가치의 표준으로 삼았으며 더욱이 국가부강의 구심력으로 여겼다. 하지만 한비의 "法" 사상이 위와 같은 의의를 가지고 있었으나 "法"의 제정에 있어서 객관적 입법기관을 통한 법제정의 제도화를 이루지 못하여 "제왕적 도구" 로 전락하고 말았다. 또한 "法"의 실행에 있어서도 지나치게 엄벌주의에 치우쳐 인도주적 정신이 결어되었음을 부인할 수 없다. 그러나 한비의 "法" 이 현대 민주주의 국가에서의 "法治" 와는 상당한 거리가 있지만 "法"의 객관성, 공정성 및 특권제거의 정신은 이어받을 만한 가치가 있고 우리 현실의 법질서 파괴 현상에 시사하는 바가 크다고 본다.
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