• Proceedings of the KIEE Conference
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• 2009.07a
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• pp.2184_2185
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• 2009

오늘날 세계 여러 국가에서 에너지 소비 절감에 대한 관심이 증가하고 있는 추세이며 특히 국가 전체 에너지 소비량중 상당량을 차지하는 건물에서의 에너지 절감에 대해 많은 관심이 집중 되고 있다. 본 논문에서는 건물 특히 주택에서의 에너지 절감 대안중 하나인 Zero Enegy House에 대해 알아보고 설계시 고려사항 및 효율적인 운영을 위한 가정용 에너지관리프로그램 및 시스템을 제안하고자 하였다.

• The Journal of Korean Institute of Communications and Information Sciences
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• v.38A no.12
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• pp.1045-1053
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• 2013

In this paper, we propose a new power-saving mechanism (PSM) for Long-Term Evolution (LTE) systems by considering a round-trip delay between a user equipment (UE) and its correspondence node. The proposed PSM changes the order of the operational procedures of the legacy LTE PSM by taking the traffic arrival pattern suffering the round-trip delay into account. After modeling the round-trip delay, we numerically analyze the proposed PSM with respect to energy consumption and buffering delay. Then, we characterize these performances by employing a simple energy-delay tradeoff (EDT) curve according to the operational parameters. The resulting EDT curve clearly shows that the proposed PSM outperforms the legacy LTE PSM in terms of both the energy consumption and buffering delay.

• Journal of the Korea Institute of Building Construction
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• v.10 no.2
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• pp.97-104
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• 2010

This study evaluated the energy efficiency of a windows system using built-in blinds, with regard to their insulation performance and their blocking of solar radiation. The study took advantage of the "Physibel Voltra" program as a physical simulation of heat transfer. To simulate the "Physibel Voltra" program, I practiced a mock-up test to determine heating quality and translation condition. I analyzed the propensity to annual energy consumption, the annual quantity of heat transfer, and the annual cooling and heating cost through a computer simulation for one general household in an apartment building. In the test, it was found that compared to a general windows system, a windows system with built-in blinds reduced the annual heat transfer by 10% in cooling states and by 11% in heating states when the blind was up. When the blind was down, the windows system with built-in blinds reduced the annual heat transfer by 25% in cooling states and 30% in heating states. When a windows system with built-in blinds is compared with a general windows system, the quantity of cooling and heating loads is reduced by 283.3kw in cooling states and 76.3kw in heating states. This leads to a reduction in the required cooling and heating energy of 359.6kw per house. It is thus judged that the use of a windows system with built-in blinds is advantageous in terms of reducing greenhouse gas emissions, because the annual TOE (tons of oil equivalent) per house is reduced by 0.078TOE, while $tCO_2$ is reduced by $0.16tCO_2$. In addition, compared with a general windows system, the cost of cooling and heating loads in the system reduces the annual cooling cost by 100,000won, and the annual heating cost by 50,000won. Ultimately, this means that cooling and heating loads are cut by 150,000won per year.

• Journal of the Korea Institute of Information and Communication Engineering
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• v.24 no.7
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• pp.925-934
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• 2020

In order to improve the energy efficiency of ships, this study designed an energy saving system (ESS) algorithm suitable for ship operation characteristics, and analyzed energy consumption patterns based on the operation characteristics of ships equipped with specific systems. Therefore, we intend to study techniques that can reduce the cost of operation. To this end, we intend to study to implement an efficient system that can increase energy efficiency that reflects the characteristics of the propulsion system of the ship based on the power generation system. The vessel to be researched is intended to conduct research on HVACS (Heating, Ventilation and Air Conditioning) mounted on LNG carriers, and based on this, it has energy with scalability to be applied to future-based vessels such as electric propulsion ships and autonomous ships. I would like to propose a savings technique.

• Proceedings of the Korea Information Processing Society Conference
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• 2011.04a
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• pp.283-286
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• 2011

자원의 고갈로 인한 에너지 부족으로 인해 전 세계가 IT의 역할과 가능성에 주목하고 있다. 24시간 방치하는 가전기기의 대기전력낭비가 이러한 에너지 부족의 주요 원인중 하나로 손꼽히고 있다. 이러한 대기전력의 낭비를 막기 위해 본 논문에서는 저 전력 통신 모듈을 이용하여 대기전력 절감을 위한 에너지 절감형 스마트 홈네트웍 시스템을 구현 및 개발 하였다.

• 한국정보통신설비학회:학술대회논문집
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• 2008.08a
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• pp.368-371
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• 2008

홈 네트워크내에서 Always-on 기기 특성으로 인하여 불필요한 에너지를 소비하는 경우가 전체 소모전력량의 60%이상을 차지한다. 그러므로 이러한 에너지 소비를 줄일 수 있는 방안에 대한 연구의 필요성이 점차 증대되고 있으며, 본고에서 연구한 Ethement 기반의 트래픽량에 의한 대기모드 전환 알고리즘은 에너지 절감에 매우 유용한 연구기술이라 할 수 있다. 이에, 본고에서는 idle time때의 네트워크 에너지 소비를 절감하기 위한 대기전력 지원형 Green Ethernet Gateway시스템설계 및 구현방안과 시스템 대기모드상태를 최대한 연장하여 energy efficient효과를 향상시키기 위한 Proxying 기반 control policy를 제안한다. 일반적으로 홈네트워크의 네트워크 연결은 ethemet을 중심으로 이루어지며, 대부분 게이트웨이를 기반으로 그 연결이 구성된다. 그러나 홈네트워크의 일반적인 동작시간이 8시간 내외인데도 불구하고, 네트워크 연결을 위해서 full Power 상태를 유지해야하는 기존의 energy unaware기반의 게이트웨이 구조로는 에너지측면에서 막대한 에너지 낭비를 초래한다. 이에 본고에서는 게이트웨이에서의 에너지 절감을 위한 트래픽량 기반의 대기모드 지원형 시스템을 구현하고 실제 홈네트워크 적용을 통한 에너지 절약효과를 실험한다. 또한 활성모드, 대기모드간 전환을 효과적으로 하기 위한 layer 2,3 Packe기반의 지능형 Proxying 알고리즘을 이용한 control policy를 제안한다.

• Korea Journal of Geothermal Energy
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• v.6 no.1
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• pp.32-38
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• 2010

• The Journal of the Korea Contents Association
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• v.18 no.1
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• pp.422-430
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• 2018

Increase in oil prices and building energy consumption has been a great burden for Korea which has significant energy dependence on foreign energy sources. In this context, reduction of building energy consumption, which comprises 40% of total energy consumption, is a very important issue. This research therefore empirically analyzed a hospital "P" that implemented ICT-based energy consumption and cost reduction initiative. The hospital first replaced existing water absorber for heating/cooling air and boiler for heating water with water heat storage heat pump system. This was accompanied by subscribing to different electricity price plans to maximize cost reduction. Secondly, the hospital additionally applied ICT-based optimized control algorithm that considers surrounding factors (external temperature, changes in energy demand). The analysis of these mechanisms indicate that the ICT-based energy consumption and cost reduction initiative for hospitals can reduce energy consumption by 53.6% with replacement of low-efficiency equipment and additionally by 18.2% with optimized control algorithm. The mechanisms will provide energy consumption reduction opportunities for other hospitals and buildings with high energy consumption.

• Journal of Energy Engineering
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• v.24 no.3
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• pp.48-54
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• 2015

In a centralized cooling plant, precise mechanical design and control strategy are required for peak and partial cooling load management. Otherwise, it will lead to low efficiency of cooling system and energy loss due to low partial load efficiency. The purpose of this paper is to enhance energy performance of the centralized cooling plant by controlling flow system in an industrial building using measured data and energy performance simulation program. The simulation results show that the proposed flow control can cut down annual electric power consumption by about 17% compared with the conventional cooling system.

• Journal of the KSME
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• v.22 no.4
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• pp.281-288
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• 1982

제품의 고급화, 정밀화, 생산성의 행상, 그리고 원가절감이 요구되는 요즈음 컴퓨터를 이용한 온라인 계측, 데이타처리 그리고 제어가 기계공학에서 차지하는 중요성이 점점 더 크게 인식되고 있다. 더욱 동력비와 연료비가 계속 상승하고 있기 때문에 건물에너지시스템, 화학공정시스템과 기타 에너지사용시스템의 온라인 모니터링(on-line moritiring)과 최적제어(에너지 사용비절감)을 위한)가 어느 때 보다도 중요성이 고조되고 있다. 본 해설을 통해서 마이크로프로세서 응용의 중요성과 일반적 방법을 잠시 생각해 보고자 한다.