• 설비공학논문집
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• 제29권11호
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• pp.580-591
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• 2017

In accordance with 2015 Paris agreement, each individual country around the world should voluntarily propose not only its (individual) reduction target, but also actively develop and present expansion targets of its scope and concrete reduction goals exceeding the previous ones. Accordingly, it is necessary to prepare a macroscopic, long-range strategy for reducing energy consumption and greenhouse gas emissions, which can cover a single building, town, city and eventually even a province. The purpose of this research is to gather and compile government-acquired data from various sources and (in accordance with contents and specificity), combine building data by stages by using multi-variable matrix and then analyze the significance of combined data for each stage. The first order data presents the probability and the cost effectiveness of energy saving on the scale of a city or a province, based only upon general information, size and power consumption of buildings. The second order data can identify a pattern of energy consumption for a building of a specific purpose and which tends to consume a larger amount of energy during one particular season (than others). Finally, the third order data can derive influential factors (base load, humidity) from the energy consumption pattern of a building, and thus propose an informed and practical energy-saving method to be applied in real time.

• Journal of Communications and Networks
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• 제15권3호
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• pp.292-300
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• 2013

Nowadays, energy saving has become a hot topic and information and communication technology has become a major power consumer. In long term evolution advanced (LTE-A) networks, heterogeneous deployments of low-power nodes and conventional macrocells provide some new features, such as coverage extension, throughput enhancement, and load balancing. However, a large-scale deployment of low-power nodes brings substantial energy consumption and interference problems. In this paper, we propose a novel switching strategy (NS), which adaptively switches on or off some low-power nodes based on the instantaneous load of the system. It is compatible with the microcells' load balancing feature and can be easily implemented on the basis of existing LTE-A specifications. Moreover, we develop an analytical model for analyzing the performance of system energy consumption, block rate, throughput, and energy efficiency. The performance of NS is evaluated by comparison with existing strategies. Theoretical analysis and simulation results show that NS not only has a low block rate, but also achieves a high energy efficiency.

• 한국콘텐츠학회논문지
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• 제14권5호
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• pp.347-355
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• 2014

본 연구에서는 에너지절감 제품을 대상으로 친환경성이 소비자의 제품에 대한 구매의도에 미치는 영향을 분석하였다. 이를 통해 본 연구에서는 에너지절감 제품의 경제성, 편리성, 친환경성 등이 구매의도에 유의한 정(+)의 영향을 나타내는 것을 확인하였다. 또한, 이들 구매영향 요인들 중 경제성과 친환경성의 효과는 소비자의 환경의식 수준에 따라 달라져서, 환경의식이 높은 소비자는 경제성에 둔감하게 반응하여 경제성이 낮더라도 친환경 제품에 대한 구매의도가 환경의식이 낮은 소비자에 비해 크게 줄지 않으며, 친환경성에는 민감하게 반응하여 친환경성의 높아지면 친환경 제품에 대한 구매의도가 환경의식이 낮은 소비자에 비해 크게 높아지는 것으로 나타났다. 본 연구의 결과에 따르면 친환경제품에 대한 마케팅전략을 수립함에 있어 소비자의 환경의식을 고려하여 환경의식이 낮은 집단에서는 해당 제품의 경제성을 높여 소비자의 비용을 절감 시키는 방안이 요구되고, 환경의식이 높은 집단에서는 해당 제품의 친환경성을 강조하는 것이 효과적일 수 있을 것이다.

• 한국철도학회:학술대회논문집
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• 한국철도학회 2005년도 추계학술대회 논문집
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• pp.676-681
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• 2005

The regenerative braked cars are being introduced in DC electric railway for energy saving. There has been a recent tendency for DC traction substation with regenerative inverter to increase in number. This is strongly related to the desire for effective utilization of electric power regenerated by DC electric cars and to the aim ensuring stable operation of regenerative braking system. The regenerative inverters DC power feed back from a generative car into AC power at a substation and supplies it to distribution lines. This paper suggest the result of characteristic analysis and capacity simulation. economical analysis in the regenerative inverter system.

• 국제학술발표논문집
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• The 5th International Conference on Construction Engineering and Project Management
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• pp.209-212
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• 2013

Global warming and climate change is now an important issue in every industry. Construction is not an exception. Greenhouse Gases (GHG) are emitted by construction activities such as fuel usage in construction equipment and so on. In light of this, Intelligent Excavating System (IES), which is a robotic excavator with site modeling capability, is developed by a research consortium formed in Korea to improve productivity, quality, and safety of the traditional earthwork. This paper presents that energy saving effect of IES in comparison to traditional method. Through this review, we propose a research strategy to achieve carbon reduction goals in construction industry.

• 토지주택연구
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• 제4권3호
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• pp.287-294
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• 2013

본 연구에서는 공사의 중점적 업무인 임대주택 부문을 대상으로 거주자의 에너지 소비실태, 거주 만족도 및 에너지 절약 방안을 분양주택 거주자와 비교를 통하여 그 차이를 분석하고 효율적인 에너지 대응방안을 모색 하는 것을 목적으로 하고 있다. 임대주택 거주자의 에너지 지출 비용은 분양주택 거주자에 비하여 가스, 전력 모두 약 절반 수준으로 조사되었으나, 전력의 경우 실제 소비량의 차이는 약 30% 수준으로 큰 차이를 보이지 않았으며 이는 가전기기의 보유수, 용량 등에 기인하는 것으로 나타났다. 또한 분양, 임대 모두 현재의 에너지 소비지출에 대한 부담 수준에서 "부담되지 않음", "약간 부담"이라는 응답비율이 전체의 80%이상을 차지하고 있으며 이는 삶의 질적 향상 요구와 함께 임대주택 부문에서도 에너지 소비가 증가 할 수 있음을 의미하고 있다. 에너지 절약 방안의 효과성과 필요성에 대한 IPA결과 분양주택 거주자에 비하여 상대적으로 임대주택 거주자가 절약에 대한 관심 및 의식수준이 낮은 것으로 나타났으며, 특히 에너지 정보 제공에 대한 부분을 저평가하는 것으로 분석되는 등 임대주택 거주자에 대한 적극적인 에너지 대응이 필요한 것으로 조사되었다. 이를 위해서는 에너지 소비에 대한 관심도와 중요도에 대한 의식전환의 계기를 제공할 필요가 있으며 임대주택 거주자들을 대상으로 하는 에너지 관련 교육 및 홍보 등의 노력이 필요한 것으로 판단된다.

• Journal of Electrical Engineering and Technology
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• 제4권4호
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• pp.515-520
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• 2009

According to the operating characteristics of pump applications, they should exhibit high efficiency and energy saving capabilities throughout the whole operating process. A novel efficiency optimization control strategy is presented here to meet the high efficiency demand of a variable speed Permanent Magnet Synchronous Motor (PMSM). The core of this strategy is the excellent integration of mended maximum torque to the current control algorithm, based on the losses model during the dynamic and the grade search method with changed step by fuzzy logic during the steady. The performance experiments for the control system of a variable speed high efficiency PMSM have been completed. The test results verified that the system can reliably operate with a different control strategy during dynamic and steady operation, and the system exhibits better performance when using the efficiency-optimization control.

• 대한전기학회:학술대회논문집
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• 대한전기학회 2006년도 심포지엄 논문집 정보 및 제어부문
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• pp.198-200
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• 2006

In this paper, three types of power control strategies for controlling a Fuel Cell Hybrid Electric Vehicle(FCHEV) are studied in view of fuel economy. The FCHEV has become one of alternatives for future vehicles since it does emit water only without any exhaust gas while it has a high well-to-wheel efficiency together with an energy saving due to regenerative braking. However, it has also several disadvantages such as the complexity of vehicle system, the increased weight and the extra battery cost. Among various power control strategies, a static power control strategy, a power assist control strategy and a fuzzy logic-based power control strategy are simulated and compared to show the effectiveness of each method.

• 설비공학논문집
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• 제28권11호
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• pp.421-427
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• 2016

The indoor temperature of a building increases during the day due to solar radiation. This behavior is significant in school buildings that are finished with high thermal capacity materials. Moreover, in school buildings, windows cannot be opened until the class has finished owing to the security policy of schools. Consequently, classrooms maintain a high temperature throughout the morning. It is thus important to remove the indoor heat before the commencement of classes in order to reduce the cooling energy needed. The Energy Recovery Ventilator (ERV) system is currently being installed in school buildings for ventilating the classrooms. Night-purge control using ERV can be a good strategy to cool the classroom in advance of the operation of the cooling system. However, the optimal operation method of the ERV for night-purge control has not yet been reported. In this study, the effect of night-purge control with ERV in school buildings is analyzed by simulation method. The results of this study showed that the energy saving effect of night-purge control with ERV is most effective in the case of 2 hours operation prior to the commencement of the first lass and when enthalpy based outdoor air cooling is used.

• International Journal of Automotive Technology
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• 제7권7호
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• pp.785-793
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• 2006

The topic of this study is the control strategy of a mild hybrid electric vehicle (HEV) equipped with a continuously variable transmission (CVT). A brief powertrain and vehicle configuration is introduced followed by the control strategy of the HEV with emphasis on two key parts. One of them is an ideal operating surface (IOS) that operates the CVT powertrain optimally from the viewpoint of the tank-to-wheel efficiency. The other is a charge sustaining energy management to maintain the battery state of charge (SOC) within an appropriate level. The fuel economy simulation results of the HEV over standard driving cycles were compared with those of the baseline vehicle. Depending on the driving cycle, 1.3-20% fuel saving potential is predicted by the mild hybridisation using an integrated starter alternator (ISA). The detailed energy flow analysis shows that the majority of the improvement comes from the idle stop function and the benefits for electrical accessories. Additionally, the differences between the initial and the final SOC are in the range $-1.0{\sim}+3.8%$ in the examined cycle.