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퇴사(堆砂)로 인(因)한 저수지내용적(貯水池內容積) 감소(減少)에 관(關)한 조사연구(調査硏究)
윤재한 ( Jae Han Yoon ),한상욱 ( Sang Uk Han ) 한국농공학회 1972 韓國農工學會誌 : 전원과 자원 Vol.14 No.3
With 31 existing reservoirs selected in the Yong San River Basin, the sedimentation of the reservoirs has been calculated by comparing the precent capacity with original value, which revealed its reduced reservoir capacity. The reservoirs have a total catchment area of 13, 871 ha. with a total capacity of 17.6 million cubic meter, and are short of water supply due to reduction of reservoir capacity. Annual sedimentation in the reservoir ranged from 120 to 3,770 cubic meter per square kilometer with great difference in its distribution, and the average value was 877 cubic meter. This wide disparity is analysed to come principally from the topography, geology, vegetation and hydraulics. The reservoir basin had a large portion of devastated land but has become green more and more in the last 10 years. It can be summarized that in the reservoirs with an average period of sedimentation of 26 years, the reduction rate of reservoir capacity amounts 12.5%, and 0.48% is shown for annual capacity reduction rate.
일정한 DC-Link전압을 가진 단상 PFC 전자식 안정기에 관한 연구
김봉규(Bong-kyu Kim),윤재한(Jae-han Yoon),이희승(Hee-seung Lee),서재호(Jai-ho Seo) 전력전자학회 2001 전력전자학술대회 논문집 Vol.2001 No.7
A study of single-stage PFC electronic ballast with constant dc-link voltage is presented in this paper. The proposed ballast is combined by two interleaved boost cells and a conventional half bridge dc/ac inverter. By exploiting the interleaving technique, the input ripple current of the electronic ballast is reduced. Theoretical analysis and experimental results for two 45[W] fluorescent lamps are presented.