• Journal of Climate Change Research
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• v.7 no.3
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• pp.269-282
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• 2016

Watershed area can be submerged due to constructions and management of dams, and these change can impact not only on ecosystem and environment of river basin area but also on local climate. This study is conducted to construct and classify climate zones of Andong Dam watershed where the area is submerged due to the construction of the dam. By applying Principal Components Analysis (PCA) and Getis-Ord $Gi^*$ statistics, three climate zones were classified for the result. Each zone was then analyzed and validated with climatic and geological features including topography, land cover, and forest type map. As a result of the analysis, there was a difference in temperature, elevation, precipitation and tree species distribution among the zones. Also, an analysis of land cover map showed that there were more agricultural land near Andong Reservoir. This study on the climatic classification is considered to be useful as the basis for decision-making or policy enforcement regarding ecosystem, environmental management or climate change response.

• KOREAN JOURNAL OF CROP SCIENCE
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• v.26 no.4
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• pp.337-343
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• 1981

Growth duration and grain and silage yields of corn was studied at eight planting dates. Yield of com was similar among planting dates upto April 25 for grain and May 10 for silage, but it decreased as planting date was delayed after the critical planting date. The number of days from planting to silking varied from 108 to 52 days according to planting dates, but growing degree days (GDD) from planting to silking was similar regardless planting dates. Both the number of days and GDD from silking to physiological maturity was similar among the planting dates when corn was planted before the above critical planting dates. However, when corn was planted later than the critical planting dates, the number of days from silking to maturity was extended as planting was delayed although GDD was similar among the planting dates.

• KOREAN JOURNAL OF CROP SCIENCE
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• v.28 no.1
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• pp.89-93
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• 1983

Rice plant was tested in the phytotron to know the varietal difference of ethylene production in different nitrogen levels. The high nitrogen concentrated varieties among tested varieties produced a large amount of ethylene. But high nitrogen concentrated leaf in the one variety produced less amount of ethylene. The varieties which produced a large amount of ethylene was remarkably increased ethylene in no nitrogen plot$(N_0)$ compare to standard level$(N_1)$. In contrast low ethylene producing varieties was remarkably decreased in double nitrogen level$(N_2)$.

• Korean Journal of Soil Science and Fertilizer
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• v.16 no.2
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• pp.119-125
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• 1983

To find out problems and changing soil properties induced by leveling of paddy, a field survey was carried out with questionares to farmers of 68 project areas (990 farmers). The soil characteristics between natural soils and cut out sites was compared with soil samples taken from 37 project areas. More than 70 percents of farmers answered to the questionares expressed satisfaction on the paddy land leveling project; however, some farmers replied dissatisfaction that the arable land was decreased the soil productivity due to loss of surface soil or insufficient surface leveling, that the government support was insufficient and that transplanting of rice might be delayed due to retardation of the project. 1. The rate of cut out soils during the land leveling on plain terrain was about 15.3%, but the rates on gently sloped terrain (2-7% slopes) and sloped terrain (7-15% slopes) were relatively high showing 25.9% and 45%, respectively. 2. The deterioration of physical properties was clear in cut out site where the hardness and bulk density increased and the porosity and the rate of water stable aggregate decreased. 3. The degree of deterioration of physical properties on the Diluvial terrace was more severe than on plains or sloped alluvial fans and valleys. The decrease of available phosphorous and the content of organic matter in the cut out place due to land leveling were prominent. 4. The rice yield from cut site was decreased by 28% comparing with that from natural soils.

• Korean Journal of Soil Science and Fertilizer
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• v.17 no.4
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• pp.330-336
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• 1984

These studies were aimed to find out the representative values of physico-chemical properties in Korean soils and to serve the basic informations to improve the soil properties for increasing the soil productivity. By the results of detailed soil survey, 14 physico-chemical properties (soil texture, moisture characteristics, organic matter content etc) were collected from 315 series of soils except Cheju soils, computerized the simple mean and the distributed area by weighted mean values with grouping of land use, drainage class and soil type. The results were as follows; 1. Simple mean values within the efficient soil depth in whole country soils were clay 20.0%, organic matter 2.03% and CEC 10.3me/100g. But weighted mean values with land area belonged to the same soil series were clay 18.0%, OM 1.85% and CEC 8.6me/100g. 2. Mean values of paddy soils weighted by area were clay 19.7%, OM 2.0% and CEC 9.1me/100g but those of upland soils were 17.9%, 1.8% and 8.1me/100g and forest soils were 16.7%, 1.8% and 8.6me/100g respectively. 3. Weighted mean values of moderately well soils with covered area were clay 18.9%, organic matter 1.7%, CEC 8.4me/100g but those of imperfectly drained soils were 21.3%, 2.2% and 9.5me/100g, and those of poorly drained soils were 15.1%, 1.8% and 9.9me/100g respectivcly. 4. Simple mean and area weighted mean values of clay content, pH, organic matter contents, cation exchange capacity and base saturation were calculated by the types of paddy and upland.

• Proceedings of the Korean Association of Geographic Inforamtion Studies Conference
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• 2010.09a
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• pp.102-107
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• 2010

본 연구에서는 2009년 강원도 읍면동 주민등록 데이터와 탐구적 공간데이터 분석 방법의 하나인 Getis - Ord $Gi^*$를 이용하여 강원도 남녀 장수인구의 공간적 분포패턴을 분석하였다. 분석결과는 강원도의 남성인구와 여성인구의 지역적 장수도에 공간적 군집이 존재하며 장수도가 높은 지역의 군집의 경우 남성과 여성 사이에 커다란 차이가 존재함을 보이고 있다. 남성의 경우 장수도가 높은 지역이 영서지역의 접경지역을 중심으로 군집하는 반면 여성의 경우 장수도가 높은 지역이 영동 해안지역 중심으로 군집하여 분포하였다. 이 결과는 장수에 영향을 미치는 환경적(자연환경적, 사회적) 요인이 남녀에 선별적으로 작용하고 있음을 암시한다.

• Journal of Korean Society for Quality Management
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• v.28 no.1
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• pp.1-12
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• 2000

Since Black Monday there has been a rash of systems developments which aimed at automating and upgrading the surveillance mechanism of monitoring the many facets of security trading. A more sophisticated mathematical model for detecting abnormal trading activities was created by Davis and Ord of Penn State along with Nobel prize laureates Solow and Modigliani of MIT. They used CAPM(Capital Asset Pricing Model) to explain the movements of stock price and applied an idea of residuals to detect unusual movements. In this paper, their idea is discussed and a new method is proposed, which involves a confidence interval of future observation in linear regression. One of the examples of the stock watch system adopting this statistical method is also presented.

• The Korean Journal of Mycology
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• v.11 no.2
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• pp.99-101
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• 1983

Black root rot caused by Cylindrocladium crotalariae is one of the most serious soilborne disease in soybean. Plant height reduction of Hwangkeum Kong was 38% by the rotting of the whole main root and 9% by rotting of the half of the main root as compared with partial discoloration in the main root. Pod number per plant and seed weight were significantly reduced by the increase of the disease severity. Important yield components such as number of pods per plant and seed weight were negatively correlated with the soybean black root rot severity.

• Transactions of the Korean Society of Mechanical Engineers
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• v.3 no.4
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• pp.143-150
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• 1979

이온 질회강 확산층의 열확산 계수를 섬열광 확산 계수측정법에 의하여 실험적으로 구하였다. 섬광 열확산 계수 측정법은 둥근 원판모양의 얇은 시편전면에 순간적으로 걍렬한 열을 가하여 확산시킨후 후면에서 증가되는 온도를 기록하여 컴퓨터에 의한 데이타 소거법을 이용해서 열확산 계수를 측정하는 것이다. 본 연구에서는 섬광 열 확산 계수 측정법에 의하여 지극히 얇은 재료의 열확산 계수를 측정 할 수 있음을 입증하였으며, 구조용 재료가 상온에서 갖는 열 확산계수를 이온질화 처리를 하지 않았을 경우와 이온질화 처리를 하였을 경우의 두가지로 나누어 측정하였다. 위의 실험결과로부터 이온질화처리를 실시하면 약 10% 까지 열확산 계수가 증가하는 것을 발견하였다.

• Journal of the Korean Society for Industrial and Applied Mathematics
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• v.12 no.2
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• pp.81-95
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• 2008

In this paper, the negative Polya-Eggenberger distribution has been introduced by compounding negative binomial distribution with beta distribution of I-kind which generates a number of univariate contagious or compound (or mixture of) distributions as its particular cases. The distribution is unimode, over dispersed and all of its positive and negative integer moments exist. The difference equation of the proposed model shows that it is a member of the Ord's family of distribution. Some of its interesting properties have been explored besides different methods of estimation been discussed. Finally, the parameters of the proposed model have been estimated by using a computer programme in R-software. Application of the proposed model to some data, available in the literature, has been given and its goodness of fit demonstrated.