• Proceedings of the Korea Society for Energy Engineering kosee Conference
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• 2002.11a
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• pp.221-230
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• 2002

본 연구의 목적은 1992년부터 산업자원부에서 추진하고 있는 에너지절약기술개발사업의 2000년까지 상용화 과제에 대한 에너지절약효과 산정 및 사회적 비용산출이다. 기술 개발에 의한 에너지 절약효과는 개발된 제품의 사용에 의한 직접적인 절약효과와 기술축적 및 타 산업으로의 기술파급 등에 의한 절약효과 등 간접적인 효과로 나누어 볼 수 있겠으나 본 연구에서는 분석자료 및 시간적인 제약으로 인하여 이 중 개발품의 사용에 의한 직접적인 효과에 한정하여 에너지 절약효과를 측정하였다.(중략)

• 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.26-29
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• 2000

직물의 염색공정 중 많은 에너지를 소비하는 건조공정에 있어 기존의 열매체를 이용한 간접가열방식을 가스버너를 이용한 직접가열방식으로 전환하여 획기적으로 에너지를 절감한 사례를 소개 하고자한다.

• Journal of Environmental Policy
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• v.12 no.1
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• pp.101-123
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• 2013

This research aims to find out the existence of considerable induced effect that the conventional I-O model cannot. First, we construct an environmental Social Accounting Matrix for Korea by combining statistics on the Korean GDP and I-O with physical data on the fossil energy consumption and $CO_2$ emissions. The impacts of productive activities on fossil energy consumption and $CO_2$ emissions are evaluated by calculating the e-SAM multipliers. By applying decomposition technique further, we get direct, indirect, and induced effects of production activities by industry. The result of decomposing the e-SAM shows that while the direct effect of the electricity industry is large, its indirect effect is very small. In the case of the primary metal industry, both the direct and the indirect influence of this industry were very large. On the contrary, in case of the service industry, the induced effect of fossil energy consumption was as high as 50% of the gross effect. These results suggest that different energy policies should be established for different industries. Also, the findings show the e-SAM model is better than I-O model in analyzing implications of policies on energy use in the economy.

• Journal of KIISE:Information Networking
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• v.35 no.3
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• pp.215-226
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• 2008

As sensor networks are used in various and dynamic applications, the function of sink-to-sensors reliable multicasting such as for task reprogramming is newly required. NAK-based error recovery schemes have been proposed for energy efficient reliable multicasting. However, these schemes have incompleteness problems such as the last packet loss. This paper introduces an ACK-based error recovery scheme, RM2I(Reliable Multicast with Implicit ACK and Indirect Recovery). It utilizes wireless multicast advantage in which a packet may be delivered to all of its omni-directional neighbor nodes. When a sender overhears a packet which its receiver forwards to the next nodes, it may interpret it as an ACK from the receiver. We call it an Implicit ACK. In Indirect Recovery, when a node receives a packet from neighbor nodes which are not its direct upstream node, it saves and utilizes it for error recovery. Using NS-2 simulator, we have analyzed their effects. We have also compared RM2I with the NAK-based error recovery scheme. In results, RM2I shows comparable performances to the ideal NAK-based scheme, except where Implicit ACK and Indirect Recovery do not occur at the edges of the networks.

• Proceedings of the KIPE Conference
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• 2011.11a
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• pp.161-162
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• 2011

신재생에너지는 자연계에 존재하는 에너지원으로 이용하는 이상의 속도로 재생되는 에너지원이다. 그 에너지원은 태양, 풍력, 조력 등으로 사실상 고갈되지 않는 에너지원이며 또한 수력, 태양광, 태양열, 조력, 풍력, 지열, 바이오매스 등의 형태로 이용된다. 이들 에너지원은 직접, 또는 간접적으로 이용하는 경우가 있다.

• Environmental and Resource Economics Review
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• v.18 no.4
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• pp.637-652
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• 2009

We measure and compare inducements of energy consumption in different industry sectors using inter-industry input and output tables of 1995, 2000 and 2005. We also compute the multiplier effects that relate to the directions of future economic effects. Key Findings are as follows. First, we observe continues decreasing linkage effects in all industries over period of 1995 to 2007. Second, backward multiplier of energy consumption were highest in the material related industry and chemical industry. As for inter-industry inducements, the indirect backward multipliers were high in the other industry. Third, the forward multiplier effect of energy consumption were as same as the backward multiplier effect's sectors. The indirect forward multipliers, however, were highest in the material related industry and chemical industry. The above findings show that since implementing pro-environmental policy in 2000s, the industries structure for reducing energy consumption has been transformed.

• The Science & Technology
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• v.12 no.2 s.117
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• pp.48-54
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• 1979

• NEWSLETTER 전기공업
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• no.99-22 s.239
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• pp.16-30
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• 1999

• Korean Journal of Environment and Ecology
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• v.13 no.3
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• pp.254-260
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• 1999

본 연구는 수목피도가 상이한 춘천시 내 두 주거지구를 선정하여 수목식재가 주요 온실가스인 대기 CO_2$의 직접적 간접적 흡수에 영향하는 효과를 비교 분석하였다 수목의 탄소저장량은 수목 피도가 약 10%인 제 1지구에서 단독 주택의 호당 평균 72kg 소목피도가 약 20%인 제 2지구에서 244kg 이었다 수목피도가 제 1지구보다 10% 차이로 더 높은 제 2지구에서 그 탄소저장량은 3배 더 많았다. 수목의 연간 직간접적 탄소흡수량은 제1지구에서 호당 평균 59kg/yr이었고 제 2지구에서는 그보다 약 2배 더 많은 110kg/yr 이었다. 연간 총흡수량중 간접적 흡수량은 연구지구에 따라 70-80%를 차지하여 직접적 흡수량보다 훨씬 많았다. 연구결과는 주거지 내 적극적인 수목식재가 대기 탄소농도를 저감하는 중요한 역할을 증진할 수 있음을 시사하였다.

• Environmental and Resource Economics Review
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• v.15 no.1
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• pp.27-50
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• 2006

We estimate $CO_2$ emissions in Korea industry, 1990 and 2000 using a commodity- by-industry IO model ($CO_2$ hybrid IO mode]). Estimated $CO_2$ emissions in industries include both $CO_2$ emissions from direct and indirect consumption. The results show that total $CO_2$ emissions has increased by 51.6 million TC (Tonne of Carbon) from 64.4 million TC in 1990 to 115.5 million TC in 2000. By applying the structural decomposition analysis technique, we decompose change of $CO_2$ emissions in Korea industry between the period 1990~2000. In the decomposition, we figure out two contributing factors, changes in $CO_2$ coefficient and changes in final demand. The latter is further decomposed as growth effects and structural effects. We also estimated each factor's contribution to the changes in $CO_2$ emissions in industries between 1990~2000. The analysis can be used as a useful resource for policy makers in improving the effectiveness of $CO_2$ emissions mitigation policy.