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A Study on Economic Analysis of Rural Green-village Planning using Solar Energy
김대식,남상운,Kim, Dae-Sik,Nam, Sang-Woon The Korean Society of Agricultural Engineers 2010 한국농공학회논문집 Vol.52 No.4
본 연구는 농촌마을을 환경친화적으로 계획하는데 활용할 수 있는 신재생에너지 중에서 태양에너지를 고려한 농촌그린빌리지 디자인에 대한 경제성분석을 목적으로 한다. 이 논문에서는 경제적 측면에서 에너지 수지를 고려하여 세 가지 형태의 연구대상 농촌마을에 대한 분석을 실시하였다. 연구대상 농촌마을들에서 실제로 사용했던 전체 에너지를 태양광 발전으로 대체하기 위한 태양광 발전시스템인 3 kWp의 단위 모듈 (PV 시스템)의 개수들을 마을별로 추정하였다. 경제성 분석에서는 두 개 마을의 순현재가치 (NPV)가 평가기간 25년내에 마이너스 값을 보였으며, 나머지 하나의 마을에서 경제성이 있는 것으로 분석되었다. 정부에서 시설설치 보조금을 60 % 지원해 줄 경우에는 모든 마을에서 25년 내에 경제성이 있는 것으로 평가되었다. 경제성 평가 관련인자들에 대한 민감도 분석을 BC (Benefit/Cost) 비율 변화에 대하여 실시한 결과, 설치비용, 전력판매단가, 할인율, 단가 증가율순으로 높은 변화율을 보였다. 본 연구의 결과는 태양에너지가 에너지 재활용이 가능한 농촌마을을 계획함에 있어서 정부의 적절한 지원정책과 에너지 잠재력이 높은 농촌마을을 선별한다면 매우 효과적인 결과를 얻을 수 있다는 것을 보여준 것으로 판단되었다.
유기금속화학증착법으로 유리기판 위에 성장된 산화아연 하이브리드 구조의 광학적 전기적 특성
김대식,강병훈,이창민,변동진,Kim, Dae-Sik,Kang, Byung Hoon,Lee, Chang-Min,Byun, Dongjin 한국재료학회 2014 한국재료학회지 Vol.24 No.10
A zinc oxide (ZnO) hybrid structure was successfully fabricated on a glass substrate by metal organic chemical vapor deposition (MOCVD). In-situ growth of a multi-dimensional ZnO hybrid structure was achieved by adjusting the growth temperature to determine the morphologies of either film or nanorods without any catalysts such as Au, Cu, Co, or Sn. The ZnO hybrid structure was composed of one-dimensional (1D) nanorods grown continuously on the two-dimensional (2D) ZnO film. The ZnO film of 2D mode was grown at a relatively low temperature, whereas the ZnO nanorods of 1D mode were grown at a higher temperature. The change of the morphologies of these materials led to improvements of the electrical and optical properties. The ZnO hybrid structure was characterized using various analytical tools. Scanning electron microscopy (SEM) was used to determine the surface morphology of the nanorods, which had grown well on the thin film. The structural characteristics of the polycrystalline ZnO hybrid grown on amorphous glass substrate were investigated by X-ray diffraction (XRD). Hall-effect measurement and a four-point probe were used to characterize the electrical properties. The hybrid structure was shown to be very effective at improving the electrical and the optical properties, decreasing the sheet resistance and the reflectance, and increasing the transmittance via refractive index (RI) engineering. The ZnO hybrid structure grown by MOCVD is very promising for opto-electronic devices as Photoconductive UV Detectors, anti-reflection coatings (ARC), and transparent conductive oxides (TCO).
김대식,나상균,Kim, Dae-Sik,Na, Sang-Kyun 대한안전경영과학회 2017 대한안전경영과학회지 Vol.19 No.2
This study aims to analyze the influence of psychological capital on organizational performance and to verify the moderating effect of emotional intelligence and the mediating effect of positive mood. The results of an analysis are as follows: First, the influence of psychological capital is higher in job satisfaction than in OCB. Second, the moderating effect of emotional intelligence is recognized in psychological capital and organizational performance. In particular, job satisfaction shows a higher moderating effect than OCB does. Third, no direct effect of psychological capital on OCB is recognized while an indirect effect of psychological capital on OCB through positive mood is recognized. Thus, it is judged that the results of this study would be effectively utilized as a means of motivation for growing individuals and achieving organizations'goals by emphasizing the importance of psychological capital and psychology and systematically managing psychological phenomena according to individual differences.
농촌그린빌리지 조성을 위한 일별 잠재적 태양광발전량의 적정확률분포형 추정 - 서산지역을 중심으로 -
김대식,구승모,남상운,Kim, Dae-Sik,Koo, Seung-Mo,Nam, Sang-Woon 한국농공학회 2008 한국농공학회논문집 Vol.50 No.6
Photovoltaic power generation is currently being recognized as one of the most popular sources for renewable resources over the country. Although it is also being adapted to rural area for may reasons, it is important to estimate the magnitudes of power outputs with reliable statistical methodologies, while applying historical daily solar energy data, for correct feasibility analysis. In this study, one of the well-known statistical methodologies is employed to define the appropriate probability distributions for monthly power outputs for the selected rural area, county of Seo-san, province of Chungnam. The results imply that the assumption of normal distributions for several months may lead to incorrect decision-making and therefore lead to the unreliable feasibility analysis. Generalized beta and triangular distributions were found to be superior to normal distribution, when describing monthly probability distributions for daily photovoltaic power. Based on the appropriate distributions resulted from this study, Monte Carlo simulation technique was also applied to provide additional flexible information for the relevant decision makers. This study found out new finding that the probability distributions should be considered to make planning of the photovoltaic power system in rural village unit, in order to give reasonable economic analysis to the decision makers.
농촌 그린빌리지 계획을 위한 일별 풍력발전량의 적정확률분포형 추정
김대식,구승모,남상운,Kim, Dae-Sik,Koo, Seung-Mo,Nam, Sang-Woon 한국농공학회 2008 한국농공학회논문집 Vol.50 No.6
This study aims to estimate the optimal probability distribution of daily electricity generation by wind power, in order to contribute in rural green-village planning. Wind power generation is now being recognized as one of the most popular sources for renewable resources over the country. Although it is also being adapted to rural area for may reasons, it is important to estimate the magnitudes of power outputs with reliable statistical methodologies while applying historical daily wind data, for correct feasibility analysis. In this study, one of the well-known statistical methodology is employed to define the appropriate statistical distributions for monthly power outputs for specific rural areas. The results imply that the assumption of normal distributions for many cases may lead to incorrect decision-making and therefore lead to the unreliable feasibility analysis. Subjective methodology for testing goodness of fit for normal distributions on all the cases in this study, provides possibilities to consider the other various types of statistical distributions for more precise feasibility analysis.
김대식,권용대,Kim, Dae-Sik,Kwon, Yong-Dae 한국농공학회 2009 한국농공학회논문집 Vol.51 No.3
This study tried to develop a tentative evaluation system on greentourism potentials(GTP) of rural villages. The GTP evaluation system consisted of 45 detail criteria within three kinds of large scale criteria, which are human resources of residents capability, amenity resources of tourists attraction, and income resources through exchange activity between rural and urban areas. The evaluation criteria were adapted from several decades existing studies considering the hardware(facility and amenity resources) and software(human resources and programs on tourism)resources in rural villages. Two kinds of test study areas, which are subdivisions of county in a typical rural area(Boori) and an suburbanized area surrounding a big city(Chooboo), located on Keumsan county in Chungnam province, were selected to test the GTP evaluation system. The results showed that the average GTP values of each village in Boori are higher than those of Chooboo, due to higher values in criteria on amenity resources and income resources, which the typical rural area may have higher value in such criteria.