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FINITE ELEMENT SOLUTIONS OF PARTIAL DIFFERENTIAL EQUATION WITH MULTIPLE CONCAVE CORNERS
김석찬,우경수 호남수학회 2018 호남수학학술지 Vol.40 No.4
In [8] they introduced a new nite element method foraccurate numerical solutions of Poisson equations with corner sin-gularities. They consider the Poisson equations with homogeneousDirichlet boundary condition with one corner singularity at the ori-gin, and compute the nite element solution using standard FEMand use the extraction formula to compute the stress intensity fac-tor, then pose a PDE with a regular solution by imposing the non-homogeneous boundary condition using the computed stress inten-sity factor, which converges with optimal speed. From the solutionthey could get an accurate solution just by adding the singular part. This approach uses the polar coordinate and the cut-o function tocontrol the singularity and the boundary condition. In this paper we consider Poisson equations with multiple sin-gular points, which involves di erent cut-o functions which mightoverlaps together and shows the way of cording in FreeFEM++ tocontrol the singular functions and cut-o functions with numericalexperiments.
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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.
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검색(Cache) 메모리를 이용한 음성 부호화기 코드북 검색에 관한 연구
김석찬,전경일 대한전자공학회 1998 전자공학회논문지T Vol.t35 No.1
Tn the analysis of the audio signal characteristices and the codebook indices of LD-CELP, there are many cases of detecting codebook indices that are used previous. LD-CELP algorithm achives good quality of audio because it has analyzed a short term of audio signal. In spite of these advantage, the method has a drawback in which searching time of best codebook index inclose due to a complicated calculation for codebook index. This paper is proposed to decreasing the searching time of codebook index using a searching memory. As a simulation of the proposed method, searching time for codebook index is reduced 3.2%-11.7% as compared with LD-CELP.
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