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평행 채널에 부착된 2차원 단일 돌출열원의 자연대류 열전달특성
김병하 경일대학교 산업기술연구소 1999 産業技術硏究所 論文集 Vol.6 No.-
2-D natural convection heat transfer in a vertical and horizontal parallel channel with single protruding heat source was studied experimentally. The particular interest was in the removal energy from the module by convective heat transfer. Hence radiative and conductive heat losses were estimated by using of thermocouples and heat flux sensor respectively. Thus, convective heat transfer and Nusselt number could be obtained. The flow field in the channel was visualized by means of smoke-method. Also, Temperature field visualized by means of Mach-Zehnder interferometer. For the range of ??, a useful correlation of mean Nusselt number was proposed as a function of channel Rayleigh number for vertical configuration in the case of channel. It is also the temperature of heat source surface was strongly affected by channel ratio and each configuration.
유갑종,이진춘,김병하 한국의사결정학회 1997 경영과학연구 Vol.6 No.-
The purpose of this research is surveying into the present situation of industrial technology of Taegu city in the standpoint of the regional economics. This research made use of the predesigned questionaire resulted from the consultation by the experts on the regional economics. From the results of this research it is found that the mechanical and metal industry has emerged as the actual key industry of this region but could not complement its recession so enough that the economy of this region has shrunken relative to other metropolitan cities. Also it is found that Taegu region has been confronted with very serious lagging technology of this industry. As a conclusion, this study suggests several policy alternatives and strategies for this industry. First, in order to build the infrastructure for technology development and co-research, a policy for inducing the investment for research and development and the co-operation system among the subjects of R&D should be made. Second, this study suggested several strategic technologies for mechanic and metalic industry and established a plan to assist this industry. Third, this study made a strategy for advancing the concerned technology and suggested that a special committee for implementing this strategy would be organized. Fourth, this study suggested that a technology center for supporting the concerned firms in this region would be built in order to solve problems of this industry, i.e. the poor ability of developing technology.