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진공관형 집열기 히트파이프 접촉방식에 따른 집열성능 비교
윤지훈(Ji-Hun Yun),정인국(In-Guk Jeong),이중섭(Chung-Seob Yi),정경택(Kyung-Teak Chung),서정세(Jeong-Se Suh) 한국기계가공학회 2011 한국기계가공학회지 Vol.10 No.6
In this study, it was compared collecting performance according to contact types between heatpipe and manifold of vacuum tube type solar collector. Between two types, direct contact type is better in collecting performance. On the other hand, Indirect type have advantage in maintenance. In the result of numerical analysis, As the temperature of heatpipe and flow rate of working fluid increased, difference of outlet mean temperature of two types became large. Also, it could be confirmed, as contact resistance between heatpipe and copper tube in indirect type increased, the difference increased too. Useful data in selection and design in vacuum tube type solar collector were proposed by the results of numerical analysis.
한국기업의 진출을 위한 중국시장의 투자환경에 관한 연구
조희영,정경택 동국대학교 경영관리연구소 1994 經營經濟論叢 Vol.18 No.-
Our investment to china has been increased since 1989. But the degree of investment is a little lower than that of any other countries. Under the internalization Korea should replace America, Japan with China to trade or invest because China is more attractive than America or Japan. From the theoretical study, the results are as follows. First, Korean corporates are competitive with Japanese on the obtaining skillful labor and raw materials at the area of Sandongsung, Tenjincity, Killimsung etc. Secon, Japaness diversify from manufacturing department to non-manufacturing department, from labor-intensived industry type to capital-intensived one. So it is necessary for Korean to make more attractive investment strategy Third, in case of direct investment, Japaness Keep primarily to prevent the transfer of production technology before maturity. But Korean is neccessary to review the technology transfer if getting the adverse profit of benefit. Fourth, Korean needs ①to co-build department store, ②to open the market which only sell Korean product and to use together ③to lift the cognition through the lease of chinese department store. Fifth Korean have stand-alone strategy but To make alliance with chinese of other country is necessary. So. to develop the chinese market for a long term view, Korean pursuit bilateral strategy by way of the internal production of high value added products and the production with in china of low value added products. Besides, it is necessary to co-invest with foreign corporates(example ; HongKong), to co-enter the chinese market with Korean corporates, to invest actively on the distribution sectors and major industry.
송병만,오미진,강정림,정경택,정동수 국립7개대학공동논문집간행위원회 2001 공업기술연구 Vol.1 No.-
In this paper, reflex RGB data captured from WebCam is stored to HDD through USB port at every 5 seconds intervals. Also, if strangers are detected through Motion Detection routine, warning voice message is broadcasted and invasion message is transmitted by e-mail and transmit the e-mail title to mobile phone through WAP(Wireless Application Protocol) Push. The detected image is stored to hard-disk in 'month - day - hour - minute - second . jpg' data type. And the image data is transmitted to web server through FTP(File Transfer Protocol) because invader can deletes or destroys the image data on hard-disk. We implement a surveillance system which is able to utilize through internet regardless of time and space.