• Korean Journal of Agricultural and Forest Meteorology
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• v.20 no.3
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• pp.262-276
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• 2018

Models to predict Leaf Wetness Duration (LWD) were evaluated using the observed meteorological and dew data at the 11 citrus orchards in Jeju, South Korea from 2016 to 2017. The sensitivity and the prediction accuracy were evaluated with four models (i.e., Number of Hours of Relative Humidity (NHRH), Classification And Regression Tree/Stepwise Linear Discriminant (CART/SLD), Penman-Monteith (PM), Deep-learning Neural Network (DNN)). The sensitivity of models was evaluated with rainfall and seasonal changes. When the data in rainy days were excluded from the whole data set, the LWD models had smaller average error (Root Mean Square Error (RMSE) about 1.5hours). The seasonal error of the DNN model had the similar magnitude (RMSE about 3 hours) among all seasons excluding winter. The other models had the greatest error in summer (RMSE about 9.6 hours) and the lowest error in winter (RMSE about 3.3 hours). These models were also evaluated by the statistical error analysis method and the regression analysis method of mean squared deviation. The DNN model had the best performance by statistical error whereas the CART/SLD model had the worst prediction accuracy. The Mean Square Deviation (MSD) is a method of analyzing the linearity of a model with three components: squared bias (SB), nonunity slope (NU), and lack of correlation (LC). Better model performance was determined by lower SB and LC and higher NU. The results of MSD analysis indicated that the DNN model would provide the best performance and followed by the PM, the NHRH and the CART/SLD in order. This result suggested that the machine learning model would be useful to improve the accuracy of agricultural information using meteorological data.

• Journal of Conservation Science
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• v.34 no.5
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• pp.387-396
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• 2018

Exposure to the natural environment can cause damage to domestic wooden cultural assets, such as temples. Deterioration is accelerated by biological damage and various environmental factors. In this study, meteorological factors were monitored by equipment installed at Beopjusa temple of Boeun province and Seonamsa temple of Suncheon province. A statistical model was applied to these data to predict the meteorological factors and to compare the predictive performance of each meteorological factor. The resulting correlation coefficient between air and dew point temperatures was highest, at 0.95, while the correlation coefficient for relative humidity had a moderate value(0.65) at both the Beopjusa and Seonamsa temples. Thus, a general linear model was found to be suitable for predicting air and dew point temperatures. An analysis of correlation between meteorological factors showed that there was strong positive correlation between air temperature and dew point temperature, and between solar radiation and evaporation at both sites. There was a weak positive correlation between air temperature and evaporation at Beopjusa temple. Wind speed was negatively correlated with both air temperature and relative humidity at Seonamsa temple. The wind speed at this location is higher than average in winter and lower than average in summer, and it was hypothesized that the low wind speed plays a role in reducing water evaporation in summer, when both air temperature and relative humidity are high. As a result, damage to the wooden buildings of Seonamsa temple is accelerated.

• Journal of the Korean Magnetics Society
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• v.26 no.6
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• pp.185-189
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• 2016

By employing photoemission spectroscopy (PES) and soft X-ray absorption spectroscopy (XAS), the electronic structure of the candidate half-metallic antiferromagnet of $Mn_3Ga$ Heusler compound has been investigated. We have studied two ball-milled $Mn_3Ga$ powder samples, one after annealing and the other without annealing, respectively. Based on the Mn 2p XAS study, we have found that Mn ions are nearly divalent in $Mn_3Ga$ and that the Mn ions having the locally octahedral symmetry and those having the locally tetrahedral symmetry are both present in $Mn_3Ga$. We have found relatively good agreement between the measured valence-band PES spectrum of $Mn_3Ga$ and the calculated density of states, which is in agreement with the half-metallic electronic structure of $Mn_3Ga$.

• Journal of Bio-Environment Control
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• v.21 no.4
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• pp.327-335
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• 2012

Nutrient uptake of each part of grapevine in the new grapevine cultivars (Jinok, Hongisul) was analyzed for making standard of annual fertilizations at four years. One year grown diploid cultivar 'Jinok' was showed more vigorous growth of root than other cultivar. Annually total nutrient of grapevine was absorbed with the same ratio of three major nutrients (Nitrogen, Phosphate, and Potassium). However about 30% of total absorbed nutrient of 3~4 year grown grapevine was distributed bunches. Potassium was measured as major nutrient in the bunch, accumulated in the peel and flesh (about 1% of D.W.). Magnesium was mainly accumulated in the petiole (about 1% of D.W.). Calcium has accumulated in the leaf (about 0.95% of D.W.), that concentration in this part was similar concentration of nitrogen (about 1.25% of D.W.). Nutrient requirement of four year grown 'Jinok' (N; 55.5 g, P; 7.7 g, K; 42.0 g, Ca; 34.6 g, Mg; 11.1 g) required less fertilizers than 'Campbell Early' (N; 57.4 g, P; 7.9 g, K; 44.4 g, Ca; 37.3 g, Mg; 12.2 g) needed. 'Hongisul' required less fertilizers compared to other grapevine cultivars, but cultural practice system for production of grape should be develop to improve their poor bud burst and fruit set.

• Proceedings of the Korean Magnestics Society Conference
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• 2004.12a
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• pp.26-27
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• 2004

• Proceedings of the Korean Association of Geographic Inforamtion Studies Conference
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• 2010.09a
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• pp.77-78
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• 2010

본 연구는 공공기반시설인 소방서 위치의 중요성을 인식하여 서울시의 소방서의 위치를 분석하고 최적의 위치에 있는지 평가하고자 한다. 소방서의 입지분석을 위하여 소방관서의 입지조건이 되는 연구의 밀집도, 건물의 수 자료와 소방방재청에서 분석한 통계자료의 정량적인 분석을 통해서 소방서의 공급량을 결정한다. 결정된 공급량, 즉 소방서 설치 개수에 따라 소방 서비스의 취약지점의 발생을 최소화하기 위하여 네트워크 분석과 입지조건 요소를 이용하여 서비스 수준을 평가한다.

• Journal of the KSME
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• v.53 no.6
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• pp.26-30
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• 2013

지구온난화의 주범인 이산화탄소의 포집저장기술(CCS) 중 포집기술에 집중하여 기술하였다. 이산화탄소 포집기술은 연소 후 포집, 연소 전 포집, 순산소 연소 포집기술로 분류되는데, 그 중에서도 연소 후 포집기술은 기존발생원에 적용하기 가장 용이한 기술로 판단되고 있다. 따라서 이 글에서는 연소 후 포집기술에 적용되는 다양한 기술 중 건식 고체 흡착제의 종류 및 건식 고체 흡착제를 이용한 연소 후 이산화탄소 포집기술 개발의 현황에 대하여 기술하였다.

• 전기의세계
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• v.28 no.5
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• pp.18-23
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• 1979

우리나라는 삼면이 바다에 연하여 있어서 각종 해풍의 영향으로 바다의 해염입자가 내륙으로 비산되어 해안근지구역의 애자가 오염되고 있다. 또 최근 산업의 대규모화와 중화학공업의 발전으로 공업지역이 점차 확대되고 있어서 이 지역에서 발생하는 매연등으로 애자의 오손상태는 더욱 심확되어 가고 있다. 이러한 오손애자는 평상시의 건조상태에서 별다른 이상은 없으나 비, 이슬, 안개등의 온윤상태에서는 내락사고로 진전되는 경우가 많다. 이와같이 발생되는 사고(염진해 사고)로 인하여 각국의 전력회사는 물론 한국전력에서도 하나의 문제점으로 대두되고 있다. 그래서 효과적인 방지대책을 찾아내기 위하여 계속 연구하고 있다. 여기서는 지금까지 조사연구된 염진해현상과 그 대책에 대하여 기술코저 한다.

• The Science & Technology
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• v.32 no.10 s.365
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• pp.71-77
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• 1999

환경의 세기를 코 앞에 두고 세계는 깨끗한 에너지원 개발에 열을 올리고 있다. 그중에서도 가장 촉망을 받고 있는 연료전지는 온갖 장애를 극복하면서 이제 실용화 단계로 들어섰다. 1999년 3월 17일에는 다임러-크라이슬러사의 쥬르겐 슈렘프회장이 기자들에게 "연료전지자동차 개발경쟁은 끝났다. 이제 우리는 그 비용을 오늘날의 내연엔진수준으로 끌어 내리는 경쟁을 개시했으며 2004년까지 목표를 달성할 것"이라고 말했다. 깨끗하고 조용하며 효과적인 연료전지는 그 응용분야가 자동차만 아니라 셀전화(이동전화)에서 랩탑컴퓨터와 가정용전력공급에 이르기까지 다양하고 폭넓은 범위로 번져 나가 21세기의 우리 생활양식에도 큰 변화를 가져 올 것으로 보인다. 연료전지개발의 현장을 찾는다.

• Proceedings of the Korea Contents Association Conference
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• 2017.05a
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• pp.141-142
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• 2017

싱글족이 거대한 소비 집단으로 부상하고 있는 현 시점에서 기업은 '싱글족의 급부상'이라는 이 흐름속에 그들의 특성과 니즈를 파악함으로서 기존에 없던 새로운 사업기회를 포착 할 수 있게 되었다. 이 논문을 통하여 싱글족의 소비심리와 소비심리를 반영하여 성공한 디자인 마테팅 사례를 연구하고 그 연관성을 살려보려 한다.