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방사선 조사에 의한 phospholipase D 활성화 연구
김영래,김기환,조문준,임규,황병두,박승길 충남대학교 의과대학 의학연구소 2002 충남의대잡지 Vol.29 No.1
Activation of oleate-dependent phospholipase D (PLD) isozyme by irradiation was reported previously. However, the effects of irradiation on other PLD isotypes (PLD1 and PLD2) have not been studied. There are several kinds of PLD isozymes in a cell. Therefore, it is difficult to study PLD isotype-specific activation in a cell by irradiation. We tested which isotype of PLD responds to irradiation. We used the fibroblasts cell lines overexpressing PLDl or PLD2 by introducing recombinant PLD1 or PLD2 cDNA. Phospholipids in cells were labelled with [(3)^H] myristic acid. Before irradiation, l-butanol was added. After irradiation with doses of 1, 2, and 10 Gray, we measured the formed phosphatidylbutanol containing [(3)^H] myristic acid. The overexpressed PLD isotypes were functional in those cell lines. PLD2 activity was enhanced by irradiation when we compared the PLD activations between control and PLD1 or PLD2 overexpressing cells. However PLD1 was not activated by irradiation. PLD2 isozyme, but not PLD1, was activated by irradiation. One Gray irradiation showed the maximal effect on PLD2 activation. The activation mechanism and physiological significance of PLD2 activation by irradiation remain to be uncovered.
Hwang, Seung Jun,Kim, Soo-Kil,Lee, June-Gunn,Lee, Seung-Cheol,Jang, Jong Hyun,Kim, Pil,Lim, Tae-Hoon,Sung, Yung-Eun,Yoo, Sung Jong American Chemical Society 2012 JOURNAL OF THE AMERICAN CHEMICAL SOCIETY - Vol.134 No.48
<P>The design of electrocatalysts for polymer electrolyte membrane fuel cells must satsify two equally important fundamental principles: optimization of electrocatalytic activity and long-term stability in acid media (pH <1) at high potential (0.8 V). We report here a solution-based approach to the preparation of Pt-based alloy with early transition metals and realistic parameters for the stability and activity of Pt(3)M (M = Y, Zr, Ti, Ni, and Co) nanocatalysts for oxygen reduction reaction (ORR). The enhanced stability and activity of Pt-based alloy nanocatalysts in ORR and the relationship between electronic structure modification and stability were studied by experiment and DFT calculations. Stability correlates with the d-band fillings and the heat of alloy formation of Pt(3)M alloys, which in turn depends on the degree of the electronic perturbation due to alloying. This concept provides realistic parameters for rational catalyst design in Pt-based alloy systems.</P>
공급망 환경에서 중소부품제조업체의 생산물류계획 통합 사례연구
황승준(Seung-June Hwang),김태영(Tai-Young Kim),금병찬(Keum-Byung Chan) 한국SCM학회 2011 한국SCM학회지 Vol.11 No.1
For small and medium sized manufacturing companies, establishing a production and logistics integration systems is one of the most critical issues in the supply chain management. It helps SMEs(Small and Medium-sized Enterprises) fulfill production and logistics activities simultaneously, and enhances operational efficiency through the reduced changes in production planning, defect ratio, and inventory turnover. This case study showed a process of adopting an information system for an auto-part manufacturing company attempting integration of production and logistics activities. In particular, this study performed a system analysis and compared the key performance between before and after adoption of the new system in the context of a supply chain with multi plants and multi distribution centers.
Convex Underestimates of Sums of Products of Linear Functions
황승준(Seung-June Hwang),서동원(Dong-Won Seo) 한국산업경영시스템학회 2007 한국산업경영시스템학회지 Vol.30 No.2
본 논문에서 선형함수의 곱의 형태로 표현된 비선형 함수를 목적식 또는 제약식에 가지는 비선형 최적화 문제를 새로운 변수를 추가하여 선형 Relaxation 최적화 문제로 Reformulation하는 기법을 소개한다. 특히, 선형함수의 곱의 형태를 가지는 비선형 함수를 포함하는 비선형 정수 최적화 문제를 선형 정수 최적화 문제로 Relaxation할 경우 두 최적화 문제의 해가 일치함을 보인다. 또한 소개된 Relaxation 기법을 응용하여, 추가되는 변수의 수를 증가시킴으로서, 보다 Tight한 Relaxation 문제를 도출하는 과정에 대하여 소개한다.
공급 사슬 환경에서 중소 제조 기업의 가격 결정 전략에 관한 연구
황승준(Seung-June Hwang),김태영(Tai-Young Kim),금병찬(Keum-Byung Chan) 한국산업경영시스템학회 2011 한국산업경영시스템학회지 Vol.34 No.2
The purpose of this paper is to suggest a supplier and buyer’s pricing decision strategy model with discount-policy over a long-term replenishment contract in a supply chain environment by small and medium size manufacturing company. We assume that the buyer has a superior economic power over a supplier and each agent in a supply chain is unaware of each other. The supplier proposes pricing decision strategy to induce the buyer to choose the terms of contract for the benefit of the supplier. Then buyer decides the terms of contract to maximize her profit considering supplier’s discount-policy. We also present a numerical example to illustrate the efficiency of pricing decision strategy.