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154kV 77,000KVA변압기 제작 개발 및 수출에 관한 보고
박경섭 대한전기학회 1977 전기의 세계 Vol.26 No.3
당사 한영공업은 중전기기제작업체로서 중전기기의 대명사격인 변압기의 설계제작은 물론 필요하고도 충분한 성능시험을 거쳐 한국전력을 비롯한 국내의 많은 수요가에 공급해왔었으며 이제는 더욱 나아가 상당량의 제품을 수출하게 되었을 뿐만아니라 항상 이에 관련된 제반 문제점의 개선방안을 꾸준히 연구해오고 있다. 특히 1969년 154kV급 변압기의 성공적인 개발이후 지난 76년 8월에는 최초로 154kV급 변압기 수출이라는 새로운 기록을 갖게되었으며 이는 당사의 쾌거이기보다는 한국 중전기 제작기술의 우수성을 단적으로 표현하는 자랑스런 일로 자부하면서 이에 관련된 그동안의 과정, 장래의 수요와 제조방향 특히 한국이 국내최로로 154kV급 변압기 3대를 필리펜에 처녀수출한 상황을 간략히 보고드리고자 한다.
박경섭,권대영,이준우,손정익 (사) 한국생물환경조절학회 2018 생물환경조절학회지 Vol.27 No.4
Supplemental lighting with artificial light sources is a practical method that enables normal growth and enhances the yield and quality of fruit vegetable in greenhouses. The objective of this study was to investigate the effect of sulfur plasma lamp (SP) and high-pressure sodium lamp (HPS) as supplemental lighting sources on the growth and yield of paprika. For investigating the effectiveness of SP and HPS lamps on paprika, the effects of primary lighting on plant growth were compared in growth chambers and those of supplemental lighting were also compared in greenhouses. In the growth chamber, plant height, leaf area, stem diameter, number of leaves, fresh weight, and dry weight were measured weekly at SP and HPS from 2 weeks after transplanting. In the greenhouse, no supplemental lighting (only sunlight) was considered as the control. The supplemental lights were turned on when outside radiation became below 100 W·m-2 from 07:00 to 21:00. From 3 weeks after supplemental lighting, the growth was measured weekly, while the number and weight of paprika fruits measured every two weeks. In the growth chamber, the growth of paprika at SP was better than at HPS due to the higher photosynthetic rate. In the greenhouse, the yield was higher under sunlight with either HPS or SP than sunlight only (control). No significant differences were observed in plant height, number of node, leaf length, and fresh and dry weights between SP and HPS. However, at harvest, the number of fruits rather than the weight of fruits were higher at SP due to the enhancement of fruiting numbers and photosynthesis. SP showed a light spectrum similar to sunlight, but higher PAR and photon flux sum of red and far-red wavelengths than HPS, which increased the photosynthesis and yield of paprika.