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플레이트를 이용한 냉간성형 각형강관 T형 접합부에 관한 실험적 연구
석희원,박금성,정상민,조성식,배규웅,문태섭 대한건축학회 2003 대한건축학회 학술발표대회 논문집 - 계획계/구조계 Vol.23 No.2(구조계)
The purpose of this paper is to investigate experimentally the strength and deformation of T-joints to evaluate the structural behavior of truss connection consisted in square hollow steel section with plate. There are the branch plate type in T-joint shapes. Principal parameters are the ratio of the chord width to thickness(2ν=31.3, 22.2, 16.7) and the ratio of branch plate thickness to chord width(βp=0.2, 0.3, 0.4, 0.5, 0.6, 0.7, 0.75, 0.85). The most important result obtained from this experiment is as follows; The ultimate strength of T-joints increase proportionally as the 2ν ratio decrease, and the βp ratio increase. The others, experimental results are summarized for ultimate strength to displacement, initial stiffness and failure mode of each T-joints.
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Saccharomyces cerevisiad Quinone Reductase에 관한 연구
김경순,박종옥,석희원 慶星大學校 1998 論文集 Vol.19 No.1
Saccharomyces cerevisiae로부터 quinone reductase를 정제하여 물리화학적 성질을 조사하였다. 정제된 효소는 polyacrylamide gel electrophoresis를 시행한 결과 하나의 주된 band를 나타내었고, gel filtration에 의해 측정된 이 효소의 분자량은 111,000 dalton 이었다. 또한 SDS-PAGE에 의해 측정된 subunit의 분자량은 22,000 dalton 이었고, 최적 pH는 6.0이었으며, 1,4-benzoquinone과 1,4-naphthoquinone에 대한 Km값은 각각 1.3M과 14.3?M인 것으로 나타났다. Quinone and related compounds have received considerable attention recently, due to their widespread environmental occurrence and toxicological potential. Evidence has favored the hypothesis that quinone reductase is protective against quinone and quinone imine toxicity, by virtue of a two-electron reduction to the hydroquinone, thereby facilitating conjugation with glucuronide, partitioning into the aqueous phase, and excretion. In addition, it has been suggested that hepatic cytosolic quinone reductase has a functional role in ethanol metabolism and decreases hepatotoxicity. Furthermore, a water-soluble quinone, coenzyme Qo, was shown to stimulate insulin release, and it was suggested that quinone reductase might play some role in physiological insulin release. An intracellular, soluble quinone reductase was purified from S. cerevisiae and some properties of the enzyme were examined. The enzyme exhibited a native molecular mass of approximately 111kDa as determined by gel filtration on a Sephacryl 200 column. The subunit molecular mass was estimated by SDS-PAGE to be 22kDa. The effect of pH on activity was measured with phosphate buffer. The optimum pH was shown to be pH 6.0. The apparent Km for 1,4-benzoquinone and 1,4-naphthoquinone are 1.3 mM and 14.3?M, respectively.
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Baker's Yeast 로부터 1,4-Benzoquinone Reductase 의 분리
김경순,석희원 ( Kyung soon Kim,Hee won Suk ) 한국유화학회 1997 한국응용과학기술학회지 Vol.14 No.3
An intracellular, soluble 1,4-benzoquinone reductase was purified from Baker`s Yeast by ammonium sulfate precipitation, DEAE-Sephacel anion exchange chromatography, and Sephacryl S-200 gel filtration chromatography. 1,4-Benxoquinone reductase was achieved 123.8 fold purification from crude homogenate with a yield of 11.1%.
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