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3次元 空間 電流座標에 의한 電力分析과 能動電力필터의 性能評價用 시뮬레이터 開發
나석환,최찬학,정영국,정화균 여수대학교 1993 論文集 Vol.7 No.-
The definition of traditional 2-DS power factor current and co-ordinate did not represent clearly relation to power facter in circuit with nonlinear thyristor loads. A new simulator for performance evaluation of Active Power Filter (APF) by 3-D space current co-ordinate applicale to general power system have not been developed, because reserchers were merely interested in improvement of source current waveforms by using APF or its simulator. Moreover, There was not APF simulator with power analysis capability which was developed for the better. Current was decomposed by active, reactive, distortion, by digital correlation signal proccessing techique based on Nowomiejski theory. Therefore, A new 3-D space current co-ordinate composited by 3 current components was defined in this paper. A new 3-D space current co-ordinate was shown state and location of current vector by trajectories with 3-D co-ordinate rotation. It evidently has excellent performance not only performsance evaluation method of APF but alse evaluation method of general power system, not conventional domain but other domain. By proposed 3-D soace co-ordinate, space power factor is derived, the true state of physical meaning is proved, new distortion factor was proposed, this study was proved true state of appropriation throughout development of simulator for APF performance evaluation with power analysis capability.
인유의 유지방구막에 대한 단일클론항체 MYS - 100 의 개발
백영진,서인영,나석환 한국낙농학회 1991 韓國酪農學會誌 Vol.13 No.2
Hybridoma have been prepared that produced monoclonal antibody MYS-100 against human milk fat globule membrane(MFGM). Monoclonal antibody MYS-100 was a immunoglobulin M class by antibody isotyping test. It was identified that monoclonal antibody MYS-100 had a immunological affinity for the reactive antigen in human MFGM which gave a approx. molecular weight of 100Kd on 6% sodium dodesyl sulfate-acrylamide gel electrophoresis. Though the 100K reactive antigen against monoclonal antibody MYS-100 was not stained with periodic acid-Shiff(PAS) on the electrophoretic gel, it reacted with various lectins included MAA(Maackia amurensis agglutinin). It was suggested that the 100k reactive antigen was a glycoprotein.
이정준,신명수,나석환,배형석,백영진 한국산업미생물학회 1994 한국미생물·생명공학회지 Vol.22 No.3
Bifidobacteria가 lactobacilli, streptococci와 혼합되어 있는 유제품으로부터 bifidobacteria의 계수를 위해 bifidobacteria의 선택배지를 개발하였다. 항생제를 포함하는 이 선택배지는 bifidobacteria의 성장에는 영향이 없으면서 다른 유산균의 10^5 cfu/㎖ 이하의 농도를 성장억제시킬 수 있었다. 다른 유산균의 10^5 cfu/㎖ 농도를 성장억제시키기 위해서는 1.0∼2.0 ㎍/㎖의 tetracycline을 BL 한천배지에 첨가해야 하는 것으로 나타났다. Neomycin과 paromomycin을 각각 25 ㎍/㎖의 농도로 1.0 ㎍/㎖의 tetracycline과 혼합하여 BL 한천배지에 첨가할 경우에는, 다른 유산균의 10^6 cfu/㎖ 농도를 성장억제시킬수 있었으나 bifidobacteria의 colony 형성율도 약간 감소하는 것으로 나타났다. 1.0 ㎍/㎖의 tetracycline을 첨가한 BL 한천배지를 bifidobacteria의 선택배지로 사용하면 L. casei, L. acidophilus 그리고 S. salivarius subsp. thermophilus가 bifidobacteria에 비해 1∼10^5배 많은 농도 차이로 존재하는 경우에도 bifidobacteria의 선택적 계수가 가능하였다. Selective agar media were constructed for the counting of bifidobacteria in dairy products containing bifidobacteria, lactobacilli and streptococci. This media containing antibiotics inhibited the growth of lactobacilli and streptococci at less than 10^5 cfu/㎖, but had no influence on the recovery of bifidobacteria. In order to inhibit the growth of 10^5 cfu/㎖ of lactobacilli and streptococci, the addition of 1.0-2.0 ㎍/㎖ of tetracycline in BL agar medium was needed. When 25 ㎍/㎖ of neomycin and paromomycin were mixed with 1.0 ㎍/㎖ of tetracycline in BL agar medium, it was able to inhibit the growth of 10^6 cfu/㎖ of lactobacilli and streptococci but had a little negative effect on the recovery of colonies of bifidobacteria. The results revealed that the BL agar medium containing 1.0 ㎍/㎖ of tetracycline was suitable to count the cell number of bifidobacteria selectively in the presence of a 1 to 10^5-fold excess of L. casei, L. acidophilus and S. salivarius subsp. thermophilus.