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이동 애드 혹 네트워크에서의 환경적응형 QoS AODV 라우팅 프로토콜에 관한 연구
裵振勝,宋東勳,吳世德,鄭燦赫,金玄郁,李光培,文泰洙,郭承郁,河載承 明知大學校 産業技術硏究所 2004 産業技術硏究所論文集 Vol.23 No.-
In this paper, we propose a bidirectional mobile Ad Hoc routing protocol based on AODV(ad-hoc on-demand distance vector routing) with QoS(quality of service) support. At presence, wireless mobile communication focuses on how to efficiently support mobility of users more than QoS guarantee. However, in order to satisfy requirement of various applications which have been or will be served, QoS guarantee between end points is a very important issue. The existing AODV routing protocol is implemented to use only BE (Best Effort) service. However, actual wireless mobile environment requires to reduce a waste of communication resources and meet with the real-time change of data paths by setting up routes with QoS support, considering available communication resources at each node in advance. Therefore, in this thesis, we propose an adaptive QoS support method using hello message in order to rapidly meet with the change of available communication resources and to smoothly perform route maintenance. For performance evaluation, we analyzed the average data reception rate. At that time, we used evaluation parameters such as node's mobility-stop time, hello message period, and packet priority, considering the node's mobility and the number of best effort/QoS data flows. As results, we found that with our proposed method the average data reception rate was increased 16.293%, 15.914%, 17.238% for 300 mobility-stop second case and 4.809%, 4.264%, 2.956% for 300 mobility-stop second case.
Ribosomal DNA의 ITS영역 염기서열 분석에 의한 기주특이적 독소 생성 Alternaria spp.의 계통분류학적 유연관계
高昇柱,洪承範,姜熙玩,劉勝憲,柳震彰 충남대학교 생물공학연구소 1998 생물공학연구지 Vol.6 No.-
기주특이적 독소 생성 Alternaria spp.와 비병원성 A. alternata의 계통분류학적 유연관계를 규명하기 위하여 기주특이적 독소 생성 Alternaria 6균, 비병원성인 A. alternata 그리고 비교균으로서 소형포자를 형성하는 A. brassicicola, 대형포자를 형성하는 A. solani의 ribosmal DNA의 5.8S를 포함한 ITS영역의 염기 서열을 분석하였던 바 다음과 같은 결과를 얻었다. 1. Alternaria spp.의 rDNA ITS영역의 염기서열 크기는 548∼562bp였으며 5.8S rDNA에서는 비교종간에 서로 일치하였고 ITS I에서는 종간 뚜렷한 차이를 보였다. 2. 기주특이적 독소 생성 Alternaria spp.의 rDNA의 ITS영역의 염기서열은 비병원성인 A. alternata의 염기서열과는 서로 일치하였으나 A. brassicicola와는 3%, A. solani와는 7%의 염기서열 차를 보였다. 3. 기주특이적 독소 생성 Alternaria spp.는 비병원성 A. alternata와 진화적으로 매우 가까운 유연관계를 나타내었다. The regions of internal transcribed spacer(ITS) including 5.8S ribosomal DNA(rDXA) from six host-specific toxin(HST) producing Alternaria spp. nonpathogenic A. alternata. A. solani and A. brassicicola were sequenced to assess their relationship in taxonomy. There was no difference in the sequences of ITS including 5.8S rDNA among the HST-producing Alternaria spp. and nonpathogenic A. alternata. However, the sequences of HST-producing Alternaria spp. were different from those of A. solani and A. brassicicola by about 7% and 3%, respectively. These results suggest that HST-producing Alternaria spp. are evolutionarily very close to non pathogenic A. alternata although they have host-specific pathogenecity.
高Cholesterol 식이 생쥐에 미치는 桂枝茯笭丸의 抗酸化效果
李承憲,朴宣東,朴元煥 동국대학교 한의학연구소 1999 東國韓醫學硏究所論文集 Vol.8 No.1
본 연구는 桂枝茯笭丸이 고 Cholesterol 식이 생쥐의 간과 신장에 미치는 항산화 효과를 조사하였다. 실험동물은 3개의 군(정상군ㆍ대조군ㆍ실험군)으로 나누었으며 정상군은 마우스용 고형사료와 물을 제한 없이 공급하고, 대조군은 Cholesterol 고형사료(cholesterol 5g/㎏)를 제한 없이 8주간 공급하면서 7,8주에 각각 처치하였다. 실험군은 물과 Cholesterol 고형사료를 제한 없이 6주간 공급한 후 桂枝茯笭丸을 2주간 음용(20㏄/day)시키면서 1,2주에 각각 처치시켰다. 대조군은 lipid peroxidation(LPO) 함량은 증가하였고 glutathion(GSH) 함량, catalase 와 superoxid ation dismutase(SOD)의 활성은 감소하였음을 관찰 할 수 있었다. 실험군은 대조군에 비해 lipid peroxidation(LPO) 함량은 유의성있게 감소하였고 glutathion(GSH) 함량, catalase 와 superoxidation dismutase(SOD)의 활성은 유의성 있게 증가하였음을 확인 할 수 있었다. 이 결과들로 보아 桂枝茯笭丸이 지질의 과산화를 억제하고 glutathion(GSH)과 같은 체내 항산화 물질을 증가시키는 효과가 있다고 사료된다. This study was made to investigate the antioxidative effects of Geagibokrounghwan on the hepatic and renal lesion induced by cholesterol in mouse. The normal group was fed basal diet and water ; control groups were fed basal diet containing 0.5% of cholesterol ; test groups were fed the Geagibokrounghwan extract (10㎖/㎏) after fed basal diet containing 0.5% of cholesterol for 6 weeks. In the liver and kidney of control group, lipid peroxidation(LPO) was significantly increased, however, the activities of superoxidation dismutase(SOD) and catalase and the amount of glutathion(GSH) were significantly decreased. In the liver and kidney of test group, lipid peroxidation(LPO) was decreased significantly as compared with control group. Contrary to this, the activities of superoxide dismutase(SOD), catalase and the amount of glutathion(GSH) were significantly increased. These results indicate that Geagibokrounghwan revealed the antioxidant effects, which may reduce the hepatic and renal damage induced by cholesterol in mouse.
Genetic Algorithm을 이용한 다중 프로세서 일정계획문제의 효율적 해법
朴承憲,吳勇周 한국경영과학회 1996 한국경영과학회지 Vol.21 No.1
Generally the Multiprocessor Scheduling(MPS) problem is difficult to solve because of the precedence of the tasks, and it takes a lot of time to obtain its optimal solution. Though Genetic Algorithm(GA) does not guarantee the optimal solution, it is practical and effective to solve the MPS problem in a reasonable time. The algorithm developed in this research consists of a improved GA and CP/MISF(Critical Path/Most Immediate Successors First). An efficient genetic operator is derived to make GA more efficient. It runs parallel CP/MISF with GA to complement the faults of GA. The solution by the developed algorithm is compared with that of CP/MISF, and the better is taken as a final solution. As a result of comparative analysis by using numerical examples, although this algorithm does not guarantee the oprimal solution, it can obtain an approximate solution that is much closer to the optimal solution than the existing GA's.