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신경작용제 분해효소의 Soman 및 Sarin Gas 분해 능력 측정 및 제독응용 가능성
김석찬,이남택 한국군사과학기술학회 1999 한국군사과학기술학회지 Vol.2 No.2
A gene expressing organophosphorus acid (OPA) anhydrolases have been cloned from Alteromonas haloplanktis strain and expressed in bacterial strain BL21. Crude extract was prepared from the transformed bacterial strain BL2l and used in testing its degrading capability of real nerve gas, soman and sarin. Within 1 minute after the start of the reaction, nearly 65% of the soman added to the reactant(3mM) was degraded by adding 1 mg of the crude extract enzyme(20.0 Unit $mg^-{1}$ crude protein). In 6 minutes, the reaction reached at its steady state, which indicates that soman was completely degraded by that time. In the case of sarin, the degradation efficiency was observed to be about 0.7 times of that of soman. If the specific activity of OPAA is enhanced by both increased expression efficiency and purification, OPAA seems to be applied for the development of decontaminant of skin, especially of eye.
동적 가중치에 기반을 둔 LVS 클러스터 시스템의 부하 분산에 관한 연구
김석찬,이영,Kim, Suk-Chan,Rhee, Young 한국정보처리학회 2001 정보처리학회논문지 A Vol.8 No.4
본 연구에서는 리눅스 가상 서버(LVS:Linux Virtual Server) 클러스터 시스템에서 실제 서버의 상태에 기초한 사용자의 요청을 분배하는 방법론을 연구하고자 한다. LVS 클러스터 시스템에서 사용자의 요청을 분배하는데 적용되는 기존 WLC(Weighted Least Connection) 방법론이 검토되었고, 실제 서버의 부하를 고려하여 각 서버에 요청을 할당하는 부하 분산 방법론을 제안하고자 한다. 부하 측정을 위한 실험은 가상의 부하를 생성하는 툴을 사용하여 서버에 부하를 부과하여 실행되었다. 본 연구에서 제시된 부하 분산 방법론이 기존의 WLC 방법론보다 실제 서버의 메모리 사용측면에서 효율을 기대할 수 있어 제안하고자 하며, 또한 서버 자원을 균형적으로 분배시키고 가중치의 변화에 대한 교정력(correction potentiality)이 어느 정도 개선됨을 확인할 수 있었다. In this paper, we study the methodology of distributing the requests of clients based on the state of real server in the LVS(Linux virtual server) clustering system. The WLC(weighted least connection) algorithm in the LVS cluster system is studied. The load distributing algorithm which assigns a weight into each real server is devised by considering the load of real servers. The load test is executed to estimate the load of real servers using a load generating tool. Throughout the result of the experiment, we suggest new load distributing algorithm based on the usage of physical memory of each real server. It is shown that the correction potentiality of new algorithm is somewhat better than that of the WLC algorithm.
Remarks on finite element methods for corner singularities using SIF
김석찬,공수련 호남수학회 2016 호남수학학술지 Vol.38 No.3
In [15] they introduced a new finite element method for accurate numerical solutions of Poisson equations with corner singularities, which is useful for the problem with known stress intensity factor. They consider the Poisson equations with homogeneous Dirichlet boundary condition, compute the finite element solution using standard FEM and use the extraction formula to compute the stress intensity factor, then they pose a PDE with a regular solution by imposing the nonhomogeneous boundary condition using the computed stress intensity factor, which converges with optimal speed. From the solution we could get accurate solution just by adding the singular part. This approach works for the case when we have the accurate stress intensity factor. In this paper we consider Poisson equations with mixed boundary conditions and show the method depends the accrucy of the stress intensity factor by considering two algorithms.
A finite element method dealing the singular points with a cut-off function
김석찬,공수련 한국전산응용수학회 2006 Journal of applied mathematics & informatics Vol.21 No.1-2
We consider an elliptic partial differential equation with input function in H−1. We assume that the type of singular part of solution is known and the solution is expressed as a sum of regular and singular term. We use a cut-off function to isolate the singular part and pose a variational problem to find the regular part of the solution. Then we have the solution by adding the regular solution and singular part. Error analysis and some example with computation will be given.
신경작용제 분해효소의 Soman 및 Sarin Gas 분해 능력 측정 및 제독응용 가능성
김석찬,이남택 陸軍士官學校 2000 한국군사학논집 Vol.56 No.-
A gene expressing organophosphorus acid anhydrolases(OPAA) has been cloned from Alteromonas haloplanktis strain and expressed in bacterial strain Escherichiacoh BL21. Crude extract was prepared from the transformed bacterial strain BL21 and used in testing its degrading capability of real nerve gas, soman and sarin. Within I minute after the start of the reaction, nearly 65% of the soman added to the reactant(3mM) was degraded by adding 1 mg of the crude extract enzyme(200 Unit mg^-1 crude protein). In 6 minutes, the reaction reached at its steady state, which indicates that soman was completely degraded by that time. In the case of sarin, the degradation efficiency was observed to be about 0.7 times of that of soman. If the specific activity of OPAA is enhanced by both incresed expression efficiency and purification, OPAA seems to be applied for the development of decontaminant of skin, especially of eye.