• 한국연초학회지
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• 제9권1호
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• pp.11-17
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• 1987

KA 101 and Xanthi-Basma were cultivated in Korea and Greece to compare the respective responses to environment and cultivation method on their growth characteristics and some properties of harvested leaves during 1984 and 1985. The contents of clay, calcium, organic matter and pH were higher in the soil of greece than that of Korea. Sunshine hours and precipitation in Greece during harvest and curing season were 8.6 hours per day and 53.3mm compared to that of 3.8 hours per day and 320mm in Korea, respectively. The plant height, leaf size and yield decreased, and days to flower was shorter 8-11 days in greek grown plants. The dehydration and curing process in Greece was linear and rapid due to the constant daily change of temperature and relative humidity with dry weather during curing season during curing season. But those process in Korea was variable and tardy due to rainy weather. Cured leaf ratio increased with upper stalk leaves in Greece but it was rather lower at top stalk position in Korea. The harvested green leaf cultivated in Greece showed higher contents of petroleum ether extract, total nitrogen and nicotine, but lower contents of reducing sugar and lower ratio of protein nitrogen to total nitrogen than in Korea.

• 한국농림기상학회지
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• 제19권2호
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• pp.54-61
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• 2017

2015년 한국의 쌀 수량은 지난 30년 중 최고치를 보였다. 이러한 수량이 계속 될 수 있는지 아니면 일회성 사건일지에 따라서 앞으로의 식량정책의 방향이 변화될 수 있다. 따라서 본 연구는 2003년부터 2015년까지의 농촌진흥청 국립식량과학원 작황시험 자료와 기상청에서 제공 하는 기상 자료를 이용하여 어떤 기상 조건에서 이러한 높은 수량이 유발될 수 있는지를 결정하고 과거에 얼마나 자주 이러한 조건이 발생했는지를 확인하여 보았다. 본 연구 결과에 따르면 2015 년 수준의 높은 수량은 최소한 7월 평균 일조 시간과 8월 말에서 9월 초 평균 일조 시간이 각각 5.1시간과 6시간 이상인 경우에 발생 가능하였다. 이를 바탕으로 과거 35년간(1981-2015) 이러한 기상 조건을 만족했던 해의 빈도를 계산한 결과 8/35 (23 %)로 비교적 자주 발생하는 사건임을 알 수 있었다. 그리고 2 년간 연속적으로 높은 수량이 발생할 수 있는 기상조건 빈도는 1/35 (2.9 %)이었으며 비교적 희박하게 발생하였다. 2015년 수준의 대풍 가능 기상이 발생한 후 향후 5 년 이내에 다시 그러한 기상이 발생할 가능성은 4/35 (11.4 %)였다. 이러한 대풍가능 기상 조건과 빈도에 대한 접근법을 이용하여 사전에 풍년 가능성에 대한 합리적 접근이 가능할 것으로 생각된다.

• 전기학회논문지P
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• 제64권4호
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• pp.246-250
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• 2015

Solar energy will be an increasingly important part of power generation because of its ubiquity abundance, and sustainability. To manage effectively solar energy to power system, it is essential part In this paper, we develop the PV power prediction algorithm using adaptive neuro-fuzzy model considering various input factors such as temperature, solar irradiance, sunshine hours, and cloudiness. To evaluate performance of the proposed model according to input factors, we performed various experiments by using real data.

• 한국연초학회지
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• 제28권1호
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• pp.9-16
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• 2006

To get the informations of burley leaf, the chemical constituents, quality indices, leaf color and the effects of climatic factors on the physicochemical properties of leaf produced from 2000 to 2004 crop years at 6 growing areas were analysed. The average leaf chemical contents for 5 years were as follows ; nicotine 2.87%, total nitrogen 4.55%, and chlorine 0.57%. The nicotine content was low while total nitrogen was slightly high as compared with recommended contents(nicotine ; $3.0{\sim}3.5%$, total nitrogen; $4.0{\sim}4.5%$). The variations of physicochemical properties among crop years were high while those of growing areas were relatively low. The nicotine contents of upper leaves were positively correlated to the sunshine hours in June and negatively correlated to the rainfalls in June and July according to crop years. However the total nitrogen content of upper leaves were positively correlated to the rainfalls in July according to growing areas. The tan-tended colored leaves were produced under the high air temperature, drought and long sunshine weather condition while the buff-tended colored leaves were produced under the contra교 condition according to crop years. It is considered that the increasing of nicotine content of Lugs may be available to decrease the nitrogen number(nitrogen/nicotine ratio) of leaf tobacco.

• 한국진공학회지
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• 제5권2호
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• pp.147-155
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• 1996

Optical properties of $TiO_2/M/Ag/M/TiO_2$ films have been changed with the diffusion barrier metal M. Optimum opticla properties of $TiO_2/M/Ag/M/TiO_2$ as the transparent heat mirror film, could be obtained with Ti among diffusion barrier metals of Ti, Cu, Zr and Al. $TiO_2/M/Ag/M/TiO_2$ film, which was fabricated by sputtering of 18 nm-thick $TiO_2$ and Ag, and 4nm-thick Ti, showed maximum transimittance of 89% at visible wavelength and infrared reflectance of 97% at wavelength of 3000 nm. Optical properties of this film was not degraded by Xenon-sunshine weather test for 240 hours. For specimens with barrier layers of Cu, Zr, and Al, degradation of optical properties by weather test was increased in a sequence of films with Cu, Zr, and Al barrier layers.

• 한국농업기계학회:학술대회논문집
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• 한국농업기계학회 1993년도 Proceedings of International Conference for Agricultural Machinery and Process Engineering
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• pp.1273-1281
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• 1993

Estimation of daily and seasonal evaportranspiration is essential for water resource planning irrigation feasibility study, and real-time irrigation water management . This paper is to evaluate the applicability of neural networks to the estimation of evapotranspiration . A neural network was developed to forecast daily evapotranspiration of the rice crop. It is a three-layer network with input, hidden , and output layers. Back-propagation algorithm with delta learning rule was used to train the neural network. Training neural network wasconducted usign daily actural evapotranspiration of rice crop and daily climatic data such as mean temperature, sunshine hours, solar radiation, relative humidity , and pan evaporation . During the training, neural network parameters were calibrated. The trained network was applied to a set of field data not used in the training . The created response of the neural network was in good agreement with desired values. Evaluating the neural networ performance indicates that neural network may be applied to the estimation of evapotranspiration of the rice crop.

• 한국농공학회지
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• 제41권6호
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• pp.25-32
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• 1999

The purpose of this study is to analyse the accuracy of weather forecasts of temperature, precipitation probability , and sky condition and to evaluate the applicability of weather forecasts for the estimation of potential evapotranspiration for irrigation scheduling. Five weather station s were selected to compare forecasted and measured climatcal data. The error between forecasted and measured temperature was calculated and discussed. The accuracy of temperature forecast using relative frequency of the error was calculated . The temperature forecasting showed considerably high accuracy. Average sunshine hours for forecasted sky conditions were calculated and showed reasonable quality. From the reliability graphs, the forecasting precipation probabililty was reliable. Potential evapotranspirations were calculated and compared using forecast and measured temperatures. The weather forecast is considered usable for irrigation scheculing.

• 한국잠사곤충학회지
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• 제18권2호
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• pp.61-64
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• 1976

1. 발생소장은 기상환경 중 강우량 및 일조시수에 큰 영향을 받으며 8월초 밀도가 급증하여 하순에 Peak를 나타내었다. 2. 엽위별분포는 상부로부터 4-16엽이 분포하고 그 중 6-12위엽에 최대로 분포하였다. 3. Orthene, Metasystox의 방제효과가 우수하였다.

• 품질경영학회지
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• 제44권3호
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• pp.509-526
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• 2016

Purpose: We would like to find the alternative method for the weathering test on rubber coated fabrics and adhesive-coated fabrics for the military products, KS M 0706 (Sunshine carbon arc) to KS M ISO 4892-2 (Xenon arc). Methods: We measured the tensile strength of adhesive-coated fabrics and adhesive products treated with sunshine carbon arc and xenon arc during 100, 150 and 200 hours, respectively. All of the results were treated with statistical test, ANOVA method. We also validate the surface modifications caused by treatment method and time by using FT-IR ATR and, SEM. Results: In case of the thick adhesive-coated fabrics (app. 1 mm), there was no distinctive difference on tensile strength by treatment method and time. In case of the thin mask hood (app. 0.22 mm) and TENT (app. 0.5 mm), there was distinctive difference on tensile strength. Especially, carbon arc showed a huge lowering properties. We could validate the curing from light and moisture, and the functional group change from cross-linking and oxidation using FT-IR ATR. In case of IBS, there was a surface cracks on SEM images. In case of mask hood, there was no distinctive differences, except for a particle falling from decreased affinity between rubber and particles caused by carbon arc. Conclusion: We concluded that there was no problems for changing xenon arc weathering test with same treatment time on IBS, KM7, K21 and adhesive products. In case of TENT and mask hood, there was a difference in tensile strength in accordance with the change of the treated time and method.

• 한국태양에너지학회 논문집
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• 제31권3호
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• pp.36-41
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• 2011

Nowadays, the solar expose right is very important with people's life. Therefore, in calculating the sunshine hours, the point analysis and area analysis methods are used in previous studies. Previous two methods have merits and faults. Therefore, ray-tracing method is used as a alternative. Ray-tracing method is adopted by the software of Autodesk Ecotect which is a widely used program by the architectural company and academic university. In this study first, ray-tracing methodology is studied with how to calculate the overshadowing area and, secondly, the sensitivity of the two major factors, overshadowing accuracy and sky subdivision, is analyzed. With these results, appropriate application of the ray-tracing method is presented.