• The Magazine of the Society of Air-Conditioning and Refrigerating Engineers of Korea
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• v.29 no.4
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• pp.8-13
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• 2000

기후변화협약과 관련하여 온난화가스 배출량감소의 중요한 대안으로서 부각되고 있는 에너지절약시장에서 민간의 활력을 이용하여 효율적이고 능동적으로 에너지절약을 시행 할 수 있는 ESCO제도를 소개하고자 한다

• The Magazine for Energy Service Companies
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• s.33
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• pp.58-69
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• 2005

에너지관리공단은 지난 3월 28일 ''소형열병합발전시스템 ESCO사업 투자사업 표준화(안) 공청회''를 개최했다. 이(안)은 기존 소형열병합발전 ESCO사업이 시공사별로 설계 및 설치범위가 다른데다 절감량 산출근거와 방법이 상이해 소비자 혼란과 ESCO간의 과열경쟁으로 치닫는 점을 보완하기 위해서 마련됐다. 공청회 결과를 토대로 표준화 안이 최종 확정될 예정이며 이 자료는(안)임을 밝혀둔다.

• JOURNAL OF ELECTRICAL WORLD
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• no.12 s.14
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• pp.21-30
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• 1968

이 자료는 1968년 5월 30일 $\~$ 6월 6일에 걸쳐 싱가포르에서 개최된 ECAFE의 제11회 에너지자원$\cdot$전력소위원회에 사무국으로부터 제출된 논문이다. 에너지를 석탄, 석유, 천연가스 수력, 기타로 구분하여 매장량, 생산량, 소비량, 수출입 등에 관하여 설명하고 있다.

• Proceedings of the Korean Society for Rock Mechanics Conference
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• 1994.03a
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• pp.52-55
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• 1994

현대산업의 주요 에너지원인 석유는 매장량의 지역적 편중이 심하여 전량수입에 의존하는 우리나라의 경우 정부의 에너지 수급정책이 국제 정세 흐름에 크게 영향을 받음. 과거 우리는 1,2차 석유파동을 통하여 안정적 에너지 공급의 위협을 받아 국가 경제 및 국민생활에 막대한 혼란을 경험한 바 있음. (중략)

• Journal of the Microelectronics and Packaging Society
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• v.20 no.4
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• pp.31-34
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• 2013

Based on the structural analysis of cantilever and the piezoelectric effect, we propose a new design of piezoelectric cantilever to harvest maximum vibration energy. Geometric parameters of piezoelectric cantilever are optimized according to two different types of cantilever structure. The main factors that affect the harvesting performance of the cantilever was the shape of the cantilever and the load at the free end. The amount of charge is affected by piezoelectric constant and mechanical strain of the cantilever.

• Explosives and Blasting
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• v.33 no.3
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• pp.1-13
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• 2015

Accidents related to gas explosion are frequently happened in foreign countries and in Korea. For the evaluation and the analysis of gas explosions, TNT equivalent methods are used. In this study, the influence of the selection of chemical equation in TNT explosion and the selection of enthalpy of the products on the explosion energy, detonation pressure, velocity of detonation, and temperature was calculated. Depending on the chemical equations, the maximum detonation pressure can be 2 times higher than the minimum. As an example for applying TNT equivalent method, an explosion of methane gas in a confined volume was assumed. With the TNT equivalent, it was possible to predict the variation of peak overpressure and impulse with the distance from the explosion location.

• Proceedings of the Korean Information Science Society Conference
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• 2010.06d
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• pp.444-448
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• 2010

지구 온난화 현상, 국제 유가 급등, 화석 연료의 고갈 등 여러 가지 환경 문제에 대한 세계적인 관심이 높아지면서 UNFCCC(United Nations Framework Convention on Climate Change) 이 각국의 온실가스 배출량을 제한하기 위한 활동을 벌이고 있다. 그리고 온실가스 배출량을 국가별 또는 산업별로 정량적으로 산출하기 위해 IPCC(Intergovernmental Panel on Climate Change), WRI/WBCSD (World Resources Institute and World Business Council for Sustainable Development) 및 ISO 등 국제기관과 표준단체에서 표준지침을 제정하여 온실가스를 산정하는 노력을 기울이고 있다. 본 논문에서는 IT산업에서 환경 문제 해결을 위해 자구적인 노력을 하고 있는 그린 IT분야에서 이슈가 되고 있는 그린데이터센터에 대해 알아보고, 데이터센터를 에너지관리 측면에서 관리하기 위한 전력사용량 모니터링에 탄소배출량 산정 지침을 적용한 "스마트 에너지/탄소 관리 시스템 설계"에 대해 살펴보고 향후 구축에 있어 이슈가 될 사항을 점검해 본다.

• Water for future
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• v.29 no.2
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• pp.235-247
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• 1996

Meteorological and soil water content data measured from semiarid watersheds of Lucky Hills and Kendall during the summer rainy and winter periods were used to study the interrelationships between the controlling variables of the evapotranspiration, and to evaluate the effects of variables on daily actual evapotranspiration (ET) estimation. Simple and multiple linear regression (MLR) analyses were employed to evaluate the order of importance of the meteorological and soil water factors involved. The information gained was used for MLR model development. Theavailable energy and vapor pressure deficit were found to be the important variables to estimate actual ET (AET) for both periods and at both watersheds. Therefore, the important variables of evapotranspiration process in these semiarid watersheds appear to be simply the components of energy term in available energy and aerodynamic term in vapor pressure deficit of Penman potential evapotranspiration (PET) equation.

• Journal of IKEEE
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• v.23 no.1
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• pp.334-337
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• 2019

In response to the increasing demand for energy, research and development of next-generation energy is actively carried out around the world to replace fossil fuels. Among them, the specific gravity of solar power generation systems using infinity and pollution-free solar energy is increasing. However, solar power generation is so different from solar energy that it is difficult to provide stable power and the power production itself depends on the solar energy by region. To solve these problems in this paper, we have collected meteorological data such as actual regional solar irradiance, precipitation, temperature and humidity, and proposed a solar power output prediction system using logic-based fuzzy Neural Network.

• Journal of Animal Science and Technology
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• v.53 no.2
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• pp.161-169
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• 2011

Methane production during anaerobic fermentation in the rumen represents an energy loss to the host animal and induces emissions of greenhouse gases in the environment. Our study focused on comparison in methane production from growing Korean native steers fed different grain sources. Six Hanwoo steers (BW = $180.6{\pm}3.1$ kg) were fed, on a DM basis (TDN 2.80 kg), 40% timothy and 60% barley concentrate (Barley) or corn concentrate (Corn), respectively, based on the Korean Feeding Standards. Each period lasted 18 days including a 14-day adaptation and a 4-day measuring times. The steers were in the head hood chamber system (one cattle per chamber) during each measuring time to measure heat and methane production per day. Different grain sources did not affect digestibilities of dry matter, crude protein, crude fiber, crude fat, NDF, ADF and nitrogen-free extract. The mean methane concentrations per day were 202.0 and 177.1 ppm for Barley and Corn, respectively. Methane emission averaged 86.8 and 77.7 g/day for Barley and Corn, respectively. Methane emission factor by maintenance energy requirement for the growing steers fed barley based concentrate was higher than the steers fed corn based concentrate (Barley vs. Corn, 31.7 kg $CH_4\;head^{-1}\;yr^{-1}$ vs. 28.4 kg $CH_4\;head^{-1}\;yr^{-1}$). Thus, methane conversion rate was 0.065 (6.5%) and 0.055 (5.5%) for Barley and Corn, respectively.