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연정운 ( Jung Woon Yeon ),원창환 ( Chang Whan Won ),원형일 ( Hyung Il Won ),( H. H. Nersisyan ) 대한금속재료학회 ( 구 대한금속학회 ) 2012 대한금속·재료학회지 Vol.50 No.6
YAG:Ce phosphor were prepared in a self-propagating high-temperature synthesis (SHS) using a 1.5Y2O3+2.5Al2O3+0.116CeO2+3.0KClO3+kCO(NH2)2+m(C2F4)n precursor mixture. The heat for the combustion propagation was provided by the reaction of a KClO3+CO(NH2)2+(C2F4)n mixture. Pure-phase YAG phosphor was synthesized at the combustion temperature of 1210℃ from k=3.6 mole and m=0.3 mole. The as-prepared YAG:Ce phosphor had a particle size of 2-10 ㎛. The addition of Teflon to the precursor mixture increased the YAG particle size and its luminescent intensity. The emission peak of the YAG phosphor was blue-shifted with an increase of Teflon concentration.
남상운 ( Nam Sang Woon ),이남호 ( Lee Nam Ho ),전우정 ( Jeon Woo Jeong ),황한철 ( Hwang Han Cheol ),홍성구 ( Hong Seong Gu ),허연정 ( Heo Yeon Jeong ) 한국농공학회 1999 韓國農工學會誌 : 전원과 자원 Vol.41 No.2
This study was conducted to develop the simple and convenient irrigation control model which can maintain the appropriate rates of irrigation and drainage of nutrient solution according to the environmental conditions and growth stages in soilless culture of cucumber. In order to obtain fundamental data for development of the model, investigation of the actual state of soilless culture practices was carried out. Most irrigation systems of soilless culture were controlled by the time clock. Evapotranspiration of cucumber in soilless culture was investigated and correlations with environmental conditions were analyzed, and its estimating model was developed. In order to develop the irrigation system which can control the amount of nutrient solution applied according to seasons, weather conditions, and growth stages, a irrigation clock control was developed. Applicability of the model was tested by simulation. Drainage rates of nutrient solution controlled by conventional time clock, integrated solar radiation, and the developed model were 61%, 20%, and 32%, respectively in cucumber perlite culture.
남상운 ( Nam Sang Woon ),이남호 ( Lee Nam Ho ),전우정 ( Jeon Woo Jeong ),황한철 ( Hwang Han Cheol ),홍성구 ( Hong Seong Gu ),허연정 ( Heo Yeon Jeong ) 한국농공학회 1998 한국농공학회 학술대회초록집 Vol.1998 No.-
This study was conducted to develop the simple and convenient irrigation control model which can maintain the appropriate rates of irrigation and drainage of nutrient solution according to the environmental conditions and growth stages in soilless culture of cucumber. In order to obtain fundamental data for development of the model, investigation of the actual state of soilless culture practices was carried out. Most irrigation systems of soilless culture were controlled by the time clock. Evapotranspiration of cucumber in soilless culture was investigated and correlations with environmental conditions were analyzed, and its prediction model was developed. A irrigation control model based on the time clock control and there were considered seasons, weather conditions, and growth stages was developed. Applicability of the model was tested by simulation. Drainage rates of irrigation system controlled by conventional time clock, integrated solar radiation, and the developed model were 61%, 20%, and 32%, respectively in cucumber perlite culture.
남상운,허연정,심옥자,심상일,이호상 안성산업대학교 1998 論文集 Vol.30 No.-
This study was carried out to investigate energy saving effect and thermal insulation characteristics of double film water curtain system during the coldest season in greenhouse. A double film water curtain system is a ground water spraying system between double layered plastic film, and it is able to make uniform water curtain. The experimental greenhouses were plastic greenhouses of two types. A type-Ⅰ was a two-thirds arched shape and its area was 350㎡ . A type-Ⅱ was a triangle shape and its area was 190㎡. Both greenhouses were cultivated with cactus. The minimum outside air temperature ranged was -2.6 to -16.7℃ and nocturnal ambient mean temperature was -6.5℃. The experimental greenhouses have maintained the air temperature above 2℃ of type-Ⅰ and 8℃ of type-Ⅱ. The ground water spraying flow rates of these greenhouses were 7.0ℓ/㎡hr of type-Ⅰ and 4.3ℓ/㎡hr of type-Ⅱ. The overall heat transfer coefficient of type-Ⅰ greenhouse was calculated at 1.97 kcal//㎡hr℃ and type-Ⅱ was 1.44 kcal/㎡hr℃. The energy saving rate of type-Ⅰ greenhouse was estimated and 78.1% and type-Ⅱ was 98.9%.