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이호생 한국산업경제학회 2007 산업경제연구 Vol.20 No.2
본 연구는 수직적으로 차별화된 혼합복점에서 공기업이 수행하는 역할 및 최저품질기준의 효과를 고찰하였다. 선행연구와는 달리 공기업이 생산량극대화를 목표로 하며 일부 소비자들이 제품을 구입하지 못하는 경우를 분석하였다. 본 연구의 주요 결론은 다음과 같다. 첫째, 공기업의 목표로 생산량극대화를 상정하면 공기업이 민간기업보다 낮은 품질을 제공하는 균형이 나타난다. 이는 기존 연구결과와는 다른 것으로서 공기업이 상대적으로 낮은 품질을 제공하는 현실에 부합된다. 둘째, 공기업에 생산량극대화 목표와 함께 최저품 질기준을 부여하면 총생산량은 감소하지만 후생수준은 상승한다. This paper analyses the role of a public firm and the effect of government regulations in a vertically differentiated mixed duopoly. Different from the previous papers on this issue, this study looks at the case where the public firm maximizes its output rather than social welfare and some of the consumers in the market do not buy the product(that is, a partially covered market). The main results are as follows. Firstly, an equilibrium that the public firm provides a lower quality product, is shown to exist, which is consistent with the reality. This is different from the previous result derived by Delbono et al(1996) which argued that a public firm maximizing social welfare would provide a higher quality product. Secondly, under the mixed duopoly with an output-maximizing public firm, the introduction of minimum quality standard could yield a higher level of social welfare in a vertically differentiated market.
이호생,김재돌,윤정인 대한설비공학회 2004 설비공학 논문집 Vol.16 No.7
This paper deals with the heat transfer characteristics of R-1270 (Propylene), R-600a (Iso-butane) and R-290 (Propane) as an environment friendly refrigerant and R-22 for condensing. The experimental apparatus has been set-up as a conventional vapor compression type heat pump system. The test section is a horizontal double pipe heat exchanger. A tube diameter of 12.70 mm with 1.32 mm wall thickness is used for this investigation. The test results showed that the local condensing heat transfer coefficients of hydrocarbon refrigerants were higher than that of R-22. The average condensing heat transfer coefficient was obtained with the maximum value in R-1270 and the minimum one in R-22. Comparing the heat transfer coefficient of experimental results with that of other correlations, the presented results had a good agreement with the Cavallini-Zecchin's correlation. It reveals that the natural refrigerants can be used as substitute for R-22.
나노입자를 포함한 자연냉매의 마이크로 휜관 응축 열전달 특성
이호생 한국동력기계공학회 2008 동력시스템공학회지 Vol.12 No.3
This paper deals with the heat transfer and pressure drop characteristics of R-290 (Propane),R-600a (Iso-butane) and (Propylene) as an environment friendly refrigerant and R-2 as a HCFC's refrigerant for condensing. The test section is a horizontal double pipe heat exchanger. Condensing heat transfer and pressure drop measurements were performed for 12.70 mm micro-fin tube and compared with the results in smooth tube. The local condensing heat transfer coefficients of hydrocarbon refrigerants superior to those of R-22 and the maximum increasing rate of heat transfer coefficient was found in R-600a. The average condensing heat transfer coefficients in hydrocarbon refrigerants showed 20 to 28% higher values than those of R-22. Hydrocarbon refrigerants have a higher pressure drop than that of R-2 with respect to refrigerant quality and mas flux. Also, the heat transfer coefficient and pressure drop of working fluids in smooth and micro-fin tube were compared. The heat transfer enhancement factor (EF) between smooth and micro-fin tube varied from 2.2 to 2.6 in all experimental conditions.
이호생 한국산업경제학회 2004 산업경제연구 Vol.17 No.4
This paper examines the effects of research joint ventures(RJVs) on the R&D efforts of downstream firms in a vertically related industry with R&D spillover at the downstream level. The main finding is that, in order for RJVs to promote R&D, the spillover rate should be even greater than what was suggested in the previous researches which did not take the vertical relation into account. This stems from downstream firms' strategically increasing R&D efforts to raise rivals' costs when inputs are priced uniformly. 본 연구는 제품생산에서의 수직적 관계와 함께 하류기업간 R&D의 파급효과가 존재하는 상황에서 하류기업들간 공동연구개발이 R&D량에 미치는 효과를 분석하였다. 하류기업간 공동연구개발이 R&D를 촉진하기 위해서는 R&D의 파급효과가 기존의 연구에서 제시되었던 것보다 상당히 커야 한다는 분석결과가 도출되었다. 기존 연구에서는 공동연구개발에 따라 R&D가 증가할 것으로 예상되는 경우라도 수직적 관계를 고려하면 오히려 R&D가 감소할 가능성이 발생하는 것이다. 이는 중간재에 대해 가격차별이 허용되는 경우보다 단일가격이 책정되는 경우 하류기업들이 전략적으로 독자적 R&D량을 증가시키는 효과에 기인한다.