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김동윤,Kim, Dong-Yun 한국방위산업진흥회 1997 國防과 技術 Vol.- No.221
지난호에 S-300V를 소개하면서 S-300 PMU-1 사진을 게재하여 이를 바로 잡습니다. S-300V는 이동형 대탄도탄 유도무기체계로 개발되었고 S-300 PMU-1은 원래 대항공기 방어를 주임무로 하는 드립니다. S-300 PMU 체계의 최신 개량형으로 서로 상이한 무기체계임을 알려드립니다. 아울러 패트리어트와 S-300V의 기사를 나누어 게재했으면 하는 의견이있어 이번호에는 패트리어트를 소개하고 8월호에 S-300V를 게재코자 합니다.
김동윤,박영순,Kim, Dong-Yun,Park, Young-Soon 대한방사선기술학회 2000 방사선기술과학 Vol.23 No.1
In the present study, to determine whether the ascorbate protect against radiation damage and the possible relationship among the radioprotective effects and antioxidant actions, the effects of ascorbate(240 mg/kg, i.p) pretreatment of mice on the survival ratio, splenic weight, major antioxidant enzymes(SOD, catalase and glutathione peroxidase) activities, glutathione contents and lipid peroxidation in the liver were examined for 2 weeks after whole-body ${\gamma}-irradiation$(6.5 Gy). The 30-day survival ratio Increased from 10% to 47% for mice treated with ascorbate. The ascorbate decreased the extent of loss in splenic weight and stimulated recovery of splenic weight in irradiated mice(p<0.01). On the day of 14 after ${\gamma-irradiation}$, the ascorbate pretreatment produced a slight increase of antioxidant enzymes activities and significantly increased reduced glutathione(GSH) contents(P<0.05) in the liver compared with non-treated group. Pretreatment with the ascorbate significantly decreased GSSG/total GSH ratio(p<0.05) without the change of GSSG in the liver and inhibited the radiation-induced increase in the hepatic malondialdehyde levels(p<0.05). In these results, we found that its radioprotective effect by protecting antioxidant enzyme activities and glutathione contents from radiation induced a decrease, and thereby suppressing lipid peroxidation which is induced by free radicals.
김동윤,Kim, Dong-Yun 한국방위산업진흥회 1997 國防과 技術 Vol.- No.220
요즈음 우리 대공방어 무기체계 구축에 논란이 되고 있는 미국의 패트리어트와 러시아의 S-300V에 대하여 이번과 다음호까지 2회에 걸쳐 게재한다. 상호 비교한다는 것이 불합리할지도 모르지만 기술적 측면을 살펴보면 도움이 되리라 생각한다.
김동윤,김상희,고보연,Kim Dong-Yun,Kim Sang-Hui,Go Bo-Yeon 한국국방경영분석학회 1991 한국국방경영분석학회지 Vol.17 No.1
In this paper, we deal with the TSP (Traveling Salesperson Problem) which is well-known as NP-complete optimization problem. the TSP is applicable to network routing. task allocation or scheduling. and VLSI wiring. Well known numerical methods such as Newton's Metheod. Gradient Method, Simplex Method can not be applicable to find Global Solution but the just give Local Minimum. Exhaustive search over all cyclic paths requires 1/2 (n-1) ! paths, so there is no computer to solve more than 15-cities. Heuristic algorithm. Simulated Annealing, Artificial Neural Net method can be used to get reasonable near-optimum with polynomial execution time on problem size. Therefore, we are able to select the fittest one according to the environment of problem domain. Three methods are simulated about symmetric TSP with 30 and 50-city samples and are compared by means of the quality of solution and the running time.