• 전기학회논문지
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• 제64권1호
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• pp.171-175
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• 2015

In this paper, because of global environmental problems such as energy shortage and abnormal climate, green energy development and energy saving technology development is being magnified. Heat insulation, the most basic and traditional energy saving method, is highly expected. Especially, simple and advanced heat insulation technique based on Nano material is promising future technology. The railway system also requires heat insulation. Especially, traditional heat insulator such as glass wool has been adopted frequently to rolling stock. The heat insulator is also adopted in general railway service buildings. Take account of cost-effective heat blocking performance, the heat insulator shall be adopted in diverse fields such as electric power, railroad, signal and communication. The only and direct solution for this problem is installing heat insulator with outstanding endurance, corrosion resistance and heat resistance to block outer heat Upgrading heat specification of equipment can be a solution, but since price and maintenance cost rise severely, this plan might be incongruous. In this research, energy saving effect of ultrathin heat insulator film was demonstrated by installing the film on roof of electrical room.

• 제어로봇시스템학회:학술대회논문집
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• 제어로봇시스템학회 2003년도 ICCAS
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• pp.2319-2324
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• 2003

This paper addresses the optimal design of dividing wall distillation column which is rapidly applied in a variety of chemical processes over recent several years because of its high energy saving efficiency. A general dividing wall column model which can cope with the heat transfer through the dividing wall is developed using rigorous computer simulation. Based on the simulation model, the effects of the internal recycle flow distribution around the dividing wall and the heat transfer across the dividing wall on overall system performance are investigated. An improved method is suggested to utilize the heat transfer through the wall to optimal column design. The suggested method is compared with the existing method via. simulation study and shows more improved energy saving result. Several control strategies for the divided wall column are tested and the optimal control strategy is propose

• 한국해양공학회지
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• 제28권1호
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• pp.1-5
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• 2014

Chosun University, in cooperation with SPP shipyard, has developed an energy saving device based on a new concept: "Crown Duct." Crown Duct is composed of a semi-duct with short struts inside and outside the duct. Theoretical calculations for two different designs were carried out using the CFD code "Ship Flow." The design selected from these two different forms by the CFD code analysis was tested in a towing tank at SSPA. The results showed about 4% efficiency gain under a full-load condition and about 7% gain under a ballast condition in the towing tank test.

• 제어로봇시스템학회논문지
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• 제9권3호
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• pp.236-241
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• 2003

This paper addresses the optimal design of dividing wall distillation column which is rapidly applied in a variety of chemical processes over recent several years because of its high energy saving efficiency. A general dividing wall column model which can cope with the heat transfer through the dividing wall is developed using rigorous computer simulation. Based on the simulation model, the effects of the internal recycle flow distribution around the dividing wall and the heat transfer across the dividing wall on overall system performance are investigated. An improved column design method is suggested to utilize the heat transfer through the wall. The suggested method is compared with the existing method via simulation study in which the proposed design shows improved energy saving result.

• Journal of information and communication convergence engineering
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• 제8권6호
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• pp.682-686
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• 2010

In this paper, we propose the fast wakeup and connection mechanisms for various energy saving schemes in order to improve QoS. First, we offer the interconnection of heterogeneous access networks via the Media Independent Information Server/Service (MIIS). Then, we propose the fast wakeup and connection mechanism for multi-interface communication systems. The proposed novel mechanism focuses on the fast provision of incoming service destined to the interface currently in energy saving mode by using MIIS-assisted interconnection. We further evaluate the performance of proposed mechanism through the numerical and experimental analysis.

• 한국태양에너지학회 논문집
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• 제31권5호
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• pp.33-40
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• 2011

In this study, it is quantitatively analyzed for thermal Characteristics of isolation-heat paint which has been supplied to a domestic market through experiments and simulations. In the case of experiment using the container box, it shows 8% decrease on cooling energy consumption in a summer season, but shows increase on heating energy consumption. As a result, the analysis has found increase of energy consumption. As a result of holding simulations with meteorological data of domestic major cities, it shows an increase of energy consumption in domestic condition, and it is hard to expect an energy saving from the isolation-heat paint unless greater air-conditioning load.

• 한국정보과학회:학술대회논문집
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• 한국정보과학회 2004년도 가을 학술발표논문집 Vol.31 No.2 (3)
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• pp.133-135
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• 2004

IEEE 802.11 표준에서 지원하는 전력절감모드(Power-Saving Mode)의 실제 전력 효율성과 통신 성능의 차이를 다양한 트랙픽 환경에서 실험한다. 그리고 전력절감모드로 운영 중인 스테이션이 다른 스테이션의 통신 성능에 미치는 영향도 조사한다. 일반적으로 전력절감모드는 전력 소비면에서는 효율적이지만 통신성능을 저하시킨다. 그러나 트래픽의 종류에 따라 통신 성능의 저하에는 차이가 발생하며 별도의 혼잡제어를 하지 않는 트래픽의 경우에는 전력절감모드의 운영이 성능면에서 의미가 있음을 확인하였다.

• 드라이브 ㆍ 컨트롤
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• 제9권1호
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• pp.10-17
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• 2012

Nowadays, the demand of energy saving is increasing more and more while the natural resources have been exhausted. Besides, the emission gas caused by vehicles has been being a serious environment problem. Therefore, many studies have been carried out, especially focusing on braking energy regeneration, in order to save energy as well as reduce emission of mobile vehicles. In this paper, we propose a closed-loop hydrostatic transmission for braking energy regeneration with two configurations to reduce the energy consumption by recovering the braking energy. The effectiveness of the proposed system was verified by simulation. The simulation results indicated that the pressure coupling configuration gave better performance in comparison to flow coupling configuration about 40.8%, 61.7% and 53.8% reduction of fuel consumption in 10 mode, 10 mode modified profile and highway schedules, respectively.

• 한국산학기술학회논문지
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• 제15권10호
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• pp.6114-6125
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• 2014

본 연구에서는 시설감귤농가와 시설포도 농가들을 대상으로 농업 에너지 절감시설과 신재생에너지원의 이용행태를 조사 분석하였다. 농가들의 에너지 이용행태를 조사한 결과, 농업 에너지 절감 시설과 신재생에너지의 이용 및 운영 관리 시스템은 여전히 미흡한 수준으로 나타났다. 시설감귤 농가와 시설포도 농가를 대상으로 실시한 IPA분석 결과에 따르면, 에너지 절감시설과 관련된 항목들에 대하여 전반적으로 중요도는 높았으나 수행도(만족도)는 크게 낮은 것으로 나타났다. 유류비 부담 등으로 인해 재배면적이 감소추세에 있는 시설감귤 농가의 경우 '관련 보조시설 확충 지원'이나 '기술개발', '저비용 대체에너지 보급문제'에 대해서는 중요하다고 판단되지만 실제 수행도는 매우 낮게 나타났다. 반면 재배면적이 증가하고 있는 시설포도농가의 경우 '에너지 절감시설에 대한 AS 용이성', '지역별 여건을 고려한 지원정책', '절감시설에 대한 기술개발'에 대해서 모두 우위를 나타냈다. 영농 광열비의 증가는 결국 농가경영에 부담을 증가시키고 대외 경쟁력을 떨어뜨리는 위험성을 갖고 있다. 현재 농가들이 사용하고 있는 등유는 열효율적인 면에서 손실이 많기 때문에 경유, 증유 등을 지속적으로 사용 할 수 있도록 기존 노후화 시설에 대한 개보수 지원과 함께 대체에너지의 보급 확대를 위한 방안이 마련되어야 한다.

• 한국정보통신학회논문지
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• 제10권8호
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• pp.1380-1385
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• 2006

Pipelined Tone Wakeup(PTW) 구조(1)는 패킷 전송에 있어서 비동기 wakeup 파이프라인을 제공을 통하여 wakeup 절차를 중복함으로써 센서 네트워크에서 에너지 절약과 종단간의 지연을 지원하기 위해 제안되었다. 그러나 PTW 구조는 2개의 radios를 사용하고 에러가 없는 환경을 가정한다. 본 논문에서는 전송 노드와 수신 노드사이에 주고 받는 패킷의 적은 수정을 통하여 지연 및 에너지 절약을 얻을 수 있는 수정된 PTW 구조를 제안한다.