• The Magazine of the Society of Air-Conditioning and Refrigerating Engineers of Korea
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• v.41 no.4
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• pp.12-23
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• 2012

• Journal of Energy Engineering
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• v.9 no.1
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• pp.68-75
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• 2000

본 연구에서는 비용효과적인 배출권거래를 모델화하여 온실가스 저감비용과 거래 이윤측면에서 한계설정이 배출권거래제에 미치는 영향을 분석하였다. 그 결과 한계저감비용곡선이 한 국가의 배출권거래 행태를 결정하는 주요요소이며, 배출권거래시장에참여하여 저감의무량의 일정분을 거래를 통해 의무를 이해하고 잔여량만을 자국의 기술력으로 저감하는 것이 비용효과적임을 확인하였다. 또한 배출권의 구매량을 제한하는 계설정은 배출권의 초과공급으로 거래가격이 낮게 형성되어 거래이윤이 구매측에 편중되었으며, 판매량 제한 또는 구매와판매 양측의 거래량을 제한할 경우는 반대로 배출권의 초과수요로 거래이윤이 판매측에 편중되는 것으로 나타났다. 그리고 거래량의 제한이 없는 경우에 가장 비용효과적인 배출권거래의 행태를 보였으나, 지구온난화에 대한 역사적 책임또는 형평성 문제, Hot air 거래등의 문제로 한계설정을 해야한다면, 구매와 판매량을 모두 제한함으로써 거래당사국들간의 이윤 편중을 완화하는 방안으로 모색해야 한다는 결론을 얻었다.

• Journal of the Earthquake Engineering Society of Korea
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• v.16 no.2
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• pp.1-13
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• 2012

Seismic fragility functions are derived for probabilistic evaluation of seismic control performance of energy dissipation devices installed in reinforced concrete structures. Displacement-dependent dampers are added to the nonlinear single-degree-of-freedom systems with different natural periods and hysteretic characteristics of which stiffness and strength has uncertainty. Nonlinear time history analysis is conducted for those SDOF systems and the result is processed statistically to obtain seismic fragility functions in the form of log normal distribution. Variation of seismic fragility functions for different parameters of SDOF systems and dampers are investigated and the seismic control performance is assessed probabilistically.

• Journal of Korea Water Resources Association
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• v.45 no.12
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• pp.1201-1211
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• 2012

This paper constructed the single country sequential dynamic CGE model to analyze the economic impacts of subsidizing water industry under the GHG emission abatement policy in Korea. We introduced the carbon tax to reduce the GHG emission and made two scenarios. One is to transfer the total tax revenue to household. The other is to mix the tax transfer and water industry support. Our Simulation results show that the macroeconomic effects might be positive by subsidizing water industry compared with the pure tax transfer. However, the support of water industry doesn't contribute to head for the non-energy intensive economy because it's economic activity highly depend on fossil energy and energy intensive products as intermediate demand. This means that it is important to make efforts on the cost effective measures such as energy technology progress, alternative energy development, and energy efficiency improvement in water industry against climate change policy.

• Journal of The Korean Society For Urban Railway
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• v.6 no.4
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• pp.417-426
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• 2018

Piezoelectric shunt is an electric type damper capable of reducing the vibration of the structure. Vibration generated at the natural frequency of the structure are converted into electrical energy through the piezoelectric material attached to the structure. Electric energy can be dissipated by thermal energy using piezoelectric shunt composed of inductor and resistance to reduce vibration. In this paper, the equation for the optimum inductance required to reduce the vibration of the cantilever beam was examined and the vibration of the aluminum cantilever was reduced by using finite element analysis and experiments. In the finite element analysis, the mode shape and the strain energy distribution were calculated to examine the mounting position, and the vibration reduction of the cantilever was calculated by adjusting the inductance and resistance circuit values. In addition, in the experiment, a variable inductor module was used to reduce the vibration occurring at a specific frequency of the cantilever. Finally, based on the results of the finite element analysis and the experiment, it was verified that the piezoelectric shunt can effectively reduce the vibration of the cantilever.

• Journal of the Korean Institute of Landscape Architecture
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• v.22 no.4
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• pp.63-74
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• 1995

본 연구의 목적은 주택의 냉방 및 난방에너지 절약을 위한 적절한 식재계획의 지침을 제시하기 위함이었다. 본 연구의 대상지는 미국 중동부 내륙의 한 도시인 쉬카고(Chicago)의 북서쪽에 위치한 주거지였다. 쉬카고 는 온대 기후대에 속하는 도시로서, 본 연구는 한국 중부지역의 주택들에 있어서 식재를 통해 냉방 및 난방에너지를 절약하고, 또한 그 에너지 절약 으로부터 대기오염물의 배출을 저감하는데 유용한 정보를 제공할 것이라고 사료된다. 본 연구는 주택의 에너지 절약에 기여하는 주택주변 현존 식생 의 차양(Shading), 증발산 및 방풍의 효과를 모델링하였다. 식재로부터 절 약된 에너지의 총비용은 식생피도가 58.9%인 주거블럭에서 1993년 한해동 안 한 가구당 46.3달러였다. 그 중, 증발산효과가 53.7%, 방풍효과가 26.1%, 차양효과가 20.2%를 각각 차지하였다. 한편, 피도가 36.3%인 주거블럭에서 의 연간 총 에너지 절약은 가구당 8.6달러였다. 식생피도가 높은 주거지에 서 식재에 의한 에너지 절약의 효과는 더욱 증대되었다. 그러나, 대부분의 현존 수목은 부적지에 위치되어 겨출철에 주택내로의 광선의 입자를 차단 함으로써 난방에너지의 요구를 증가시켰다(수목 한 개체당 최대 6달러). 차 양효과를 최대화하기 위해서는 주택건물의 남쪽가까이에서는 교목의 식재 를 가급적 회피하고, 수관이 가능한 한 넓은 교목을 주택건물의 서쪽과 동 쪽가까이에 식재하여야만 한다. 증발산과 방풍의 효과를 증진하기 위해 건 물의 북쪽, 북동쪽 및 북서쪽에서의 고밀도 식재가 요구된다.

• Journal of Korean Society of Coastal and Ocean Engineers
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• v.30 no.2
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• pp.51-60
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• 2018

This study was conducted to observe the effects of gravity and infra-gravity wave of detached submerged breakwater in the coast of Yeongnang-dong, Sokcho, as analyzing continuous wave data by performing field observations on the front area (W0) and rear area (W1, W2). Wave transmission coefficient ($K_t$) of submerged breakwater was analyzed in two parts, short-period wave (gravity wave) and infra-gravity wave. The wave energy reduction effect was analyzed and compared with the value of the design. In case of above wave height 2.0 m at the front area (W0) of the submerged breakwater, the short-period wave height at point W1 is reduced by about 65% and the short-period wave height at point W2 is reduced by about 59%. The depth of crest of submerged breakwater conducted in a sea area differs from the design, and the wave energy reduction effect is analyzed to be smaller than the design plan. The infra-gravity waves were amplified to 2.11 and 1.71 at the W1 and W2 points, respectively, and the wave height at W2 point was smaller than that at W1 point.

• Journal of Energy Engineering
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• v.10 no.4
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• pp.363-369
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• 2001

Process design and performance evaluation were made for medium-size gasification combined/cogeneration plant. Based on the designed plant process configuration, the effects of $NO_x$ reduction techniques on the $NO_x$ emission, the power output, the efficiency and the stability of plant are investigated by applying various $NO_x$ reduction methods such as unsaturated/saturated nitrogen injection and fuel saturation of gas turbine combustor. The $NO_x$ reduction by nitrogen injection is more remarkable than that by fuel saturation, and its effect can be more enhanced by using saturated nitrogen. In addition, the applications of $NO_x$ reduction techniques accompany the improvement of plant power output and efficiency with the decrease of $NO_x$ emission, while it can cause unstable gas turbine operation.

• Spatial Information Research
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• v.20 no.1
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• pp.71-80
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• 2012

Carbon Point system is Climate Change Action Program by providing incentives in proportion to voluntary reduction of energy consumption such as electricity, gas and water for houses, commercial facilities. So far, existing researches have been limited to construction of GHG(Green House Gas) Inventory and have little attention to empirical impact analysis on carbon reduction policy regarding the residential section. Therefore, this paper is intended to provide convincing findings of impact analysis on carbon reduction, revolving around the carbon point system. For this, we firstly calculated the carbon emission by using electricity and gas usage data in household targeting to Seongbuk-Gu. Carrying out IPA and spatio-temporal analysis. Then, we are capable of visualizing spatial patterns from 2007 to 2009 as a macro analysis. Following that, we explored the effect on carbon point system through Ex ante-Ex post Analysis by paired t-test. To conclude, we can spatially identify the distribution with a significant difference between carbon emissions according to energy use as a micro analysis by Hot Spot to Analysis on point entities. It is to be hoped that this method will be utilized to establish various policies and to evaluate the effect of reduction of GHG.

• The Magazine of the Society of Air-Conditioning and Refrigerating Engineers of Korea
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• v.31 no.5
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• pp.26-30
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• 2002

하수처리장 슬러지, 음식물, 유기성 폐수 소화가스와 매립지 가스 등 바이오가스의 에너지 활용 방안과 그 온실가스 저감 효과에 대하여 소개하며 특히 가장 일반적이고 손쉬운 방법인 가스엔진 발전 방법에 대하여 분석하였다