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윤용철 ( Yoon Yong Cheol ),이근후 ( Lee Keun Hoo ),서원명 ( Suh Won Myung ) 한국농공학회 2000 韓國農工學會誌 : 전원과 자원 Vol.42 No.4
This study was carried out to investigate the water requirement of twisted sweet peppers which are cultivated in a green house. The meteorological conditions during the experiment period was close to that of normal year except the temperature and relative humidity. The growth status was improved with the increased saturation ratio. The range of the variation of daily water requirement were very large. The peak consumption occurred in the early August. And the higher saturation ratio resulted in higher water requirement. The total water requirement were about 57.180g/d/plant for pot with 100% (P100) of saturation, about 38.700g/d/plant for pot with 80%(P80) of saturation, about 23,720g/d/plant for pot with 60%(P60) of saturation, and about 53,390g/d/plant for field cultivation in the green house, respectively. The water requirement was correlated with average ambient temperature and growing status, while no significant correlation were found between water requirement and minimum relative humidity or intensity of solar radiation. And the higher correlation was shown as the saturation ratio was increased. The transpiration coefficients of twisted sweet pepper were 378.0g/g for field cultivation in the green house, 363.3g/g for P100, 338.7/g for P80 which was the smallest among pot cultivation, and 472.1g/g for P60 , respectively.
윤용철 ( Yoon Yong Cheol ),서원명 ( Suh Won Myung ),강종국 ( Kang Jong Guk ),조화대 ( Shino Kazuo ) 한국농공학회 2001 한국농공학회 학술대회초록집 Vol.2001 No.-
This study was initially performed to investigate current red-pepper drying methods commonly being adopted on red-pepper cultivation farm area. Based on the informations obtained from the field survey, an experiment of red-pepper drying was carried out to verify the actual drying potential of plastic covered solar house similar to the conventional pipe frame greenhouses covered with one or two layer of plastic film. Some results obtained from field survey and drying experiment for red-pepper are summarized as follows; 1. Various patterns of red-pepper drying process were found; 1) complete natural drying with red-pepper exposed in outdoor air, 2) hot air drying by dry chamber only, 3) combination drying by hot air dryer together with plastic covered passive solar house, 4) drying with plastic covered solar house unit. 2. The average air temperatures of outdoor and solar house during drying experiment period were 26.9 - 30.8 and 28.6 - 33.8°C, respectively, and the maximum air temperatures of those two were 34.2 - 36.4 and 39.8 - 52.3°C, respectively. Horiiontal solar intensity during experiment period was 18.49 - 23.96 MJ/m<sup>2</sup>, and relative humidity of outdoor and experimental solar house were 56 - 66% and 64 - 70%, respectively. 3. The weight of red-pepper during drying experiment period was decreased almost linearly from initial moisture content of 85% to final moisture content of 14%.
어스앵커의 인발저항력 - 온실의 내풍성에 관한 연구 -
윤용철 ( Yoon Yong-cheol ),서원명 ( Suh Won-myung ),양영호 ( Yang Young-ho ) 한국농공학회 2002 한국농공학회 학술대회초록집 Vol.2002 No.-
The uplift capacity and displacement of an earth anchor for improving the wind resistance of the 1-2W type plastic film pipe on greenhouse was tested using the steel circular vertical earth anchor with various diameters and embedded depths (L) in dry sand. The diameter (B) of the model anchor is 90mm, 120mm, 150mm, respectively. The model tests were performed embedded depth ratios (L/B) ranging from 1~3 in loose density. In the case of diameter 90mm, as the uplift loading increased, the uplift capacity also increased until the loading was reached to ultimate uplift capacity. After that, the uplift capacity was continually increased or decreased until the experiment was finished. In general, the ultimate uplift capacity was different depending upon the anchor diameter and embedded depth ratios.
윤용철 ( Yoon Yong Cheol ),이종창 ( Lee Jong Chang ),서원명 ( Suh Won Myung ),이근후 ( Lee Keun Hoo ) 한국농공학회 1999 한국농공학회 학술대회초록집 Vol.1999 No.-
This study was performed to figure out an optimum water environment and to obtain the fundamenLal data related with saving labor and water consumption for the chinese cabbages being grown in greenhouse. The productivity of cabbages cultivated in both pots and floor were compared to each other in the aspects of height and weight depending on the soil saturation levels. Obtained results are as follows; In case of pot cultivation, the height as well as weight of cabbage in 80% soil saturation level(P80) were measured to be larger than those in the other 2 soil saturation levels(P100 and P60). The weight of floor cultivated cabbages were relatively larger than that of pot cultivated ones. In accordance with saturation ratio, the general trend of water consumption rate was maximum in P80 and was decreased in the order of P80. PIOG and P60. And the average indoor temperature as well as the plant growth rate were found to be closely related with water consumption rate.
온실단지내 폐영농자재의 처리에 관한 실태조사 (Ⅱ) - 진주, 김해지역을 중심으로 -
윤용철 ( Yong-cheol Yoon ),서원명 ( Won-myung Suh ),김영주 ( Young-ju Kim ),최만권 ( Man-gwon Choi ),배용한 ( Yong-han Bae ) 한국농공학회 2008 한국농공학회 학술대회초록집 Vol.2008 No.-
The purpose of this study was to suggest effective management plans for farming material waste that is generated inside greenhouse complexes, and to review the management status of the farming material waste for farming facilities. The research results are summarized as follows. The farming waste that is generated in Korea has been treated the same as life waste, and the data for the waste is still being managed however, there was no information about the supply amounts which lowered the reliability. It was not easy to research the management status of the farming equipment supplied to the farms because they are purchased based on need however, it was determined that the system that can manage from the supply, collection, recycling, and treatment steps by using local agriculture association and agriculture technology management centers. Moreover, it was determined that the environmental friendly materials need to be further developed to recycle the farming materials. Especially, for the public dumps, not only financial support but also the support of the local residents is required. The farmer’s groups, villages or local governments can advertise and provide education for residents so they can be the guardians of their local environment.
윤용철 ( Yoon Yong Cheol ),이근후 ( Lee Keun Hoo ),서원명 ( Suh Won Myung ) 한국농공학회 1998 한국농공학회 학술대회초록집 Vol.1998 No.-
This study was performed to figure out water consumption of the twisted sweet pepper in a greenhouse. Obtained results are as follows; 1. The ambient temperature was nearly same as the normal year, while the average air temperature and the relative humidity in the green house were little bit higher than those of the outside condition. The transparency of the greenhouse roof was approximately 50%. The total amount of rainfall during the irrigation period was 1,040㎜ which is 350㎜ higher than 1997 during the same period. 2. In case of pot cultivation, as the saturation ratio was increased, the aeaf area and plant height and yield were also increased. The yield from the field cultivation was higher than the average yield from the pot cultivations which are treated by three levels of saturation ratio. 3. The variation of daily consumptive use of the twisted sweet pepper was very large in it's range. In case of the pot cultivation, as the saturation was increased, the daily and the total consumptive use were increased. 4. The daily consumptive use was strongly correlated with the ambient temperature, while it was weakly correlated with the relative humidity and solar radiation. 5. There were close correlation between plant environment; leaf area, plant height and yield, and consumptive use. As the saturation ratio was increased, the correlation between those plant factors and consumptive use was getting stronger.