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최영하(Choi Young-Ha),이강원(Lee Kang-Won),온정근(Ohn Jung-ghun),심재복(Shim Jae-Bock),권기진(Kwon Ki-Jin),송중호(Song Joong-Ho) 한국철도학회 2004 한국철도학회 학술발표대회논문집 Vol.- No.-
As a method of confirming light flickering, we tried to confirm the flicker index measured by Flickermeter and the application possibility by using digital intensity of illumination meter. Also, after simulating the quality deterioration of electric power and generating a various voltage change, we studied on the function between the flicker index measured by Flickermeter and the flicker index for the intensity of illumination by using digital intensity of illumination meter.
서지방호용 절연변압기 성능시험관련 모의해석 및 시험결과와의 비교분석
최영하(Choi Young-Ha),김명룡(Kim Myung-Young),이강원(Lee Kang-Won),온정근(Ohn Jung-Ghun),송중호(Song Joong-Ho) 한국철도학회 2003 한국철도학회 학술발표대회논문집 Vol.- No.-
"KRS 6330-3256라" standard regulates performance test of insulating transformer for protecting the electronic interlock linkage equipment which is being done by test procedures and methods according to the standard. The balance/unbalance test evaluating the performance of transformer are applied by impulse voltage(12/200㎲) but affected by many other factors. Therefore, the review about these is necessary to have the reliability and reappearance of test results. In this paper, we have simulated about several phenomenon appearing in real balance/unbalance test and compared simulated results with real ones. With the basis of these results, the influence to test result of inner and outer factors are investigated and analyzed and established the plan boosting the reliability and reappearance of test results.
최영준(Young-Jun Choi),전희(Hee Chun),김학주(Hark-Joo Kim),이시영(Si-Young Lee),염성현(Sung-Hyun Yum),최영하(Young-Ha Choi),신용습(Yong-Seop Shin),정두석(Doo-Seok Chung) (사)한국생물환경조절학회 2007 생물환경조절학회지 Vol.16 No.1
참외의 저온기 무가온 시설재배에서 원적외선 흡수율이나 무적성 등의 물리적 특성을 향상시킨 필름 피복이 참외 과실품질에 미치는 영향을 조사하기 위하여 과실 성분을 조사하였다. 일반 PE필름과 기능성이 추가 된 5가지의 필름을 6동의 하우스에 피복하여 성주지역 2곳에 각각 설치한 후 재배하였다. 하우스 내부 온도는 높은 적외선 흡수를 보였던 필름인 J-l과 J-2에서 K-3에 비해 약 2~5℃정도 높았다. 과실의 β-carotene 함량과 당함량은 기능성 필름과 일반필름에서 유의성 있는 차이를 보여 J-l, J-2, J-3 및 K-l에서 높게 나타났는데 이것은 필름의 특성에 따른 보온효과 때문인 것으로 생각된다. 성숙후 단맛을 좌우하는 sucrose 함량도 기능성 필름에서 높았는데 이로 인해 당도도 향상되는 결과를 보였다. Ascorbic acid 함량은 투광량과 보온성이 낮은 K-2에서 더 높은 경향을 보였고 무기원소 함량은 처리 간에 차이가 없었다. 이상의 결과는 참외의 저온기 단동 하우스재배에서 보온성과 투광성을 향상시킨 필름을 피복함으로써 참외 과실의 품질을 일부 개선할 수 있음을 시사하였다. This study was conducted to investigate the effect of functional cover film on oriental melon fruit quality under unheated plastic greenhouse cultivation in cold period. The 6 kind of films having different characteristics were covered at plastic greenhouses and oriental melon seedlings were cultivated at 2 regions of Seongju, respectively. The air-temperatures in plastic greenhouses of J-1 and J-2, having high infrared absorption rate, were about 2~5℃ higher than K-3. The contents of β-carotene and sugar of fruit showed significant difference between functional and normal films. The sucrose, determining a sweetness during maturation, and soluble solids content of fruits cultivated in J-1, J-2, J-3, and K-1 were higher than those of K-2 and K-3. Ascorbic acid of fruits was highest in K-2 having low light transmission rate and thermo-keeping capacity. There was no significant difference in mineral content among all of cover films. These results indicated that the use of functional greenhouse covering films could improve fruit quality such as β-carotene and sugar content of oriental melon.