• Journal of the Korean Solar Energy Society
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• v.39 no.2
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• pp.57-69
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• 2019

Because the hospital building operates 24 hours a day, 365 days a year for treatment and restoration of patients, it has a different pattern of energy use than that of ordinary buildings. Hospitals contribute to energy consumption and have a negative environmental impact. This study aims to find how meaningful energy performance, reflecting good energy management and ECMs, can be operated for hospital buildings, a category encompassing complex buildings with different systems and large differences between them. In this study, we proposed the energy diagnosis & evaluation method and energy management process to verify energy saving through operation data based on system & facility characteristics, operation pattern and energy consumption characteristics of hospital building. Energy consumption structures were surveyed throughout 4 reference hospital in Seoul, Korea. Findings confirm that different hospital departments have hugely different energy-demand profiles. Energy efficiency and energy saving potentials are presented. The energy performance analysis can be applied to a wide range of problems in energy-system operation.

• Journal of the Korea Institute of Information and Communication Engineering
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• v.18 no.11
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• pp.2786-2791
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• 2014

This paper describes the smart illuminating system based on the obstacle environmental presetting to improve the user convenience to easy lighting and energy conservation. Obstacle environment has trouble controlling the illuminating equipment using manual buttons in certain circumstances, which requires a smart remote controller. The smart remote controller is operated by the smart phone, motion sensor and timer to turn on and off the lamps. The event sensor module transmits the signals of the event occurrence to equipment on the remote place when smart phone and motion sensor detect an event, and the illuminator received the event turn on or off the lamp. The system results in energy saving by simple on/off control and manipulating the operating time with controlling the illuminating system preset by user's obstacle or preference circumstances. The proposed system implementation is experimented to figure out the energy saving about13.5w/h and the optimized convenience control.

• Proceedings of the Korea Information Processing Society Conference
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• 2005.05a
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• pp.1609-1612
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• 2005

무선 센서 네트워크에서 각 센서 노드들은 에너지가 제한되기 때문에 에너지 소비는 중요한 이슈다. 센서 네트워크에서 최단경로를 찾거나 이웃들의 에너지 정보를 알기 위한 주기적인 제어 메시지의 교환은 불필요하게 에너지를 소모하게 만든다. 본 논문에서는 불필요한 전송과 오버헤더를 줄이기 위해 제어 메시지의 교환 없이 에너지를 고려한 효율적 라우팅 기법을 제안한다. 시뮬레이션 결과 별도의 제어 메시지 교환이 없을 때 에너지가 더 절약되었다.

• Proceedings of the Korean Institute of Information and Commucation Sciences Conference
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• 2009.05a
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• pp.391-395
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• 2009

최근 한정된 자원으로 인한 에너지 수요가 증가하면서 에너지 절약 문제가 중요한 과제로 대두되었다. 본 논문에서는 효율적인 에너지 절약 문제를 해결하기 위한 방법으로 열 영상과 퍼지 제어 기법을 적용하여 실내 냉방 장치의 풍향과 풍속을 제어하는 방법을 제시한다. 본 논문에서는 실내 냉방 장치의 풍향과 풍속을 제어하기 위해 획득한 초기 열 영상을 색상 분포 영상으로 변환한다. 색상 분포 영상은 Red, Magenta, Yellow, Green, Sky, Blue의 온도 값을 가지는 RGB 값이며 각 색상은 $24.0^{\circ}C$에서 $27.0^{\circ}C$의 분포의 온도 값을 가진다. 본 논문에서는 색상 분포 영상을 좌에서 우로 5개의 계층 구간으로 분류하여 온도를 분석한다. 실내 공간의 색상 분포 영상을 분석하여 얻어진 각 계층 구간의 온도와 대기 중의 습도를 퍼지 소속 함수에 적용하여 구해진 결과 값을 비퍼지화 하고 최종적으로 풍향의 세기를 제어한다. 그리고 열 영상을 분석하여 풍향의 우선순위, 풍향의 지속시간을 결정한다. 제안된 방법을 $300{\times}400$ 크기의 열 영상을 대상으로 기존의 시스템과의 전력량 차이를 시뮬레이션 한 결과, 제안된 방법이 효과적인 것을 확인할 수 있었다.

• Journal of the Korea Academia-Industrial cooperation Society
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• v.11 no.12
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• pp.4991-4996
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• 2010

Clustering method in wireless sensor network is the technique that forms the cluster to aggregate the data and transmit them at the same time that they can use the energy efficiently. Even though cluster group model is based on clustering, it differs from previous method that reducing the total energy consumption by separating energy overload to cluster group head and cluster head. In this thesis, I calculate the optimal cluster group number and cluster number in this kind of cluster group model according to threshold of energy consumption model. By using that I can minimize the total energy consumption in sensor network and maximize the network lifetime. I also show that proposed cluster group model is better than previous clustering method at the point of network energy efficiency.

• Journal of the Institute of Electronics Engineers of Korea CI
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• v.45 no.3
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• pp.175-183
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• 2008

In wireless sensor networks with ad hoc networking capability, sensor nodes are battery operated and are usually disposable once deployed. As a result, each sensor node senses and communicates with limited energy and, thus, energy efficiency has been studied as a key design factor which determines lifetime of a wireless sensor network, and it is more improved recently by using so-called cross-layer optimization technique. In this paper, we propose and implement a new energy saving mechanism that reduces energy consumption during data collection by controlling transmission power at sensor nodes and then measure its performance in terms of lifetime improvement for the wireless sensor network platform ZigbeX. When every sensor node transmits sensed data to its clusterhead, it controls its transmission power down to as low level as communication is possible, resulting in energy saving. Each sensor node controls its transmission power based on RSSI(Received Signal Strength Indicator) of the packet received from its clusterhead. In other words, the sensor node can save energy by controlling its transmission power down to an appropriate level that its clusterhead safely receives the packet it transmits. According to the repetitive experiment of the proposed scheme on the ZigbeX platform using the packet analyzer developed by us, it is observed that the network lifetime is prolonged by up to 21.9% by saying energy during the data collection occupying most amount of network traffic.

• Journal of Energy Engineering
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• v.27 no.3
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• pp.28-35
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• 2018

Guidelines and institutional support for buildings are being promoted around the world as measures for environmental pollution and energy conservation. In Korea, standards are prepared according to the energy saving design standards of new buildings as amended in 2013.09.01 and the zero energy building for new buildings mandatory process is being prepared from the recommendations. Nevertheless, the government's binding power on smaller buildings is insufficient. Energy savings were analyzed for the recently constructed office buildings (application of external insulation technique) and propose a dual envelope techniques were proposed for energy reduction.

• Proceedings of the Korea Information Processing Society Conference
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• 2008.05a
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• pp.958-961
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• 2008

유비쿼터스 컴퓨팅 기술의 진보로 무선 센서 네트워크의 관심이 높아지고 있다. 센서 네트워크는 MAC 프로토콜에서 정해진 전송 스케줄에 따라 주기적인 수면(sleep)을 통해 에너지를 절약하는 연구가 진행되어 왔다. 그리고 센서 노드가 센싱한 데이터를 BS(Base Station)로 전달하기 위한 라우팅 경로 기법과 클러스터링 기법 등이 제시되고 있다. 센서 네트워크에서 가장 중요한 이슈중의 하나는 제한된 자원 즉, 센서 노드에 주어진 에너지를 활용하여 네트워크의 수명을 최대로 연장 하는 것이다. 본 논문에서는 S-MAC 프로토콜의 스케줄관리 기법을 이용하여 무선 센서 네트워크에서 서로 다른 그룹 간의 통신을 원활하게 하기 위한 통신기법을 제시한다.

• Journal of the Korean Institute of Illuminating and Electrical Installation Engineers
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• v.19 no.6
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• pp.1-8
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• 2005

The quantity of light available for a space can be translated in term of the amount of energy savings through a process of a building energy simulation. To get significant energy savings in general illumination, the electric lighting system must be incorporated with a daylight - activated dimmer control. A prototype configuration of an once interior has been established and the integration between the building envelope and lighting and HVAC systems is evaluated based on computer modeling of a lighting control facility. First of all, an energy-efficient luminaire system is designed and the lighting analysis program, Lumen-Micro 2000 predicts the optimal layout of a conventional fluorescent lighting future to meet the designed lighting level and calculates unit power density, which translates the demanded met of electric lighting energy. A dimming control system integrated with the contribution of daylighting has been applied to the operating of the artificial lighting. Annual cooling load due to lighting and the projecting saving amount of cooling load due to daylighting under overcast diffuse sky m evaluated by computer software ENER-Win. In brief, the results from building energy simulation with measured daylight illumination levels and the performance of lighting control system indicate that daylighting can save over 70 percent of the required energy for general illumination in the perimeter zones through the year A 25[%] of electric energy for cooling and almost all off heating energy may be saved by dimming and turning off the luminaires in the perimeter zones.

• Proceedings of the Korea Information Processing Society Conference
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• 2015.10a
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• pp.110-112
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• 2015

IoT 환경이 우리 주변 환경에서 점차 구축되어지고 있다. 그에 따라 효율적인 IoT 환경 구축을 위한 에너지 효율화 기법이 필요하게 되었다. 그 중에서도 출입구에 설치 할 수 있는 생체인증 도어락과 NFC 인증 시스템을 발전 시켜 평상시에 소비 되는 에너지를 정전식 버튼을 활용하여 소비되는 전력 에너지를 절약 할 수 있는 시스템을 제안 하고자 한다. 현재 상용화 되어있는 생체인증을 확인해보고 NFC장비를 도입하여 보다 효율적인 관리를 제안하고자 한다.