• The KIPS Transactions:PartA
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• v.16A no.1
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• pp.27-34
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• 2009

Recently, power saving with high performance is one of the hot issues in the mobile systems. Various technologies are introduced to achieve low-power processors, which include sub-micron semiconductor fabrication, voltage scaling, speed scaling and etc. In this paper, we introduce a new method that reduces of energy loss at the data cache. Our methods take the benefits in terms of speed and energy loss using selective way precharging of way prediction with concurrent way selecting. By the simulation results, our method achieves 10.2% energy saving compared to the way prediction method, and 56.4% energy saving compared to the common data cache structure.

• The Journal of Korean Institute of Communications and Information Sciences
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• v.36 no.12A
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• pp.959-965
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• 2011

As the usage of mobile stations increases thanks to various services, power saving mechanisms of mobile station operated by battery power have been gained much attention. This paper presents a power saving mechanism(PSM) of IEEE 802.16m, called Mobile WiMAX, for 4G mobile technology. This paper first presents different points of the PSM of IEEE 802.16m from IEEE 802.16e, which is a basis of IEEE 802.16m. This paper proposes a dynamic sleep cycle adjustment algorithm for improving the performance of IEEE 802.16m PSM by considering the arrival pattern of incoming packets from base station. Performance of the algorithm is analyzed in terms of energy consumption as well as waiting time of packets.

• IEMEK Journal of Embedded Systems and Applications
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• v.6 no.2
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• pp.55-61
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• 2011

We propose power-saving real-time scheduling method for mixed task sets which consist of both time-based periodic and event-based aperiodic tasks in the automotive operating system. In this system, we have to pursue maximization of power-saving using the slack time estimation and minimization of response time of aperiodic tasks simultaneously. However, since these two goals conflict each other, one has to make a compromise between them according to the given application domain. In this paper, we find the adjustment factor which gives better response time of aperiodic tasks with slight power consumption increase. The adjustment factor denotes the gravity of response time for aperiodic tasks. We apply the ccEDF scheduling for time-based periodic tasks and then calculate new utilization to be applied to the adjustment factor. In this paper, we suggest the lccEDF algorithm to make a tradeoff between the two goals by systematically adjusting the factor. Simulation results show that our approach is excellent for variety of task sets.

• Journal of the Korea Safety Management & Science
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• v.15 no.1
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• pp.161-167
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• 2013

The purpose of this study was to assess power loss in the computer and office automation equipment and identified a way to save power consumptions through field measurement. In this study, the meaning of standby power was to consume power while waiting for the use of any electronic equipment. This standby consumption was about 11% of total power consumption even though we did not seriously realize it. Therefore, it was very important to measure accurate power consumption at the standby status of electronic equipment. In addition, it also helped to reduce potential risks of electricity associated disasters. This study proposed the way to reduce power losses through automatic turn off switches for power outlets and switches. Finally, this study can evaluate power consumption patterns that can reduce power consumptions and potential risks of power related disasters. This also can achieve the goals of sustainability that can reduce environmental impacts by lowering energy consumptions and greenhouse gas emissions.

• Journal of the Korean Institute of Illuminating and Electrical Installation Engineers
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• v.28 no.6
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• pp.40-44
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• 2014

In this paper, maximum power is the lowering device using the facility's energy use and peak load electricity through analyzing attitude should like to make it reduce its power base rate. Simulator to manage the demand for power, a maximum electric power base power from electronic watt-hour meters by a device's signal, predictive power, the current power by computing the goal of power for less than Maximum peak power and peak shift, so that you can manage, and peak York, which role you want a cut Metal heat treatment result which analyzes the data, demand for electricity company over the years of analyzing the characteristics of each load, and effects and Reducing power consumption device every month identified seven Sequence control to the load system and successful power control is about showing that the defined goals.

• 전기의세계
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• v.33 no.7
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• pp.400-405
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• 1984

최근 원유가의 상승과 자원 고갈에 따라 Energy 절약 방안이 종래에는 생각하지도 않았던, 기계적인 제어에 의해 사용하던 기기에도 관심을 갖게되었다. 최근 전력전자 기술의 진보로 가변속 제어 Inverter로 교류 전동기의 가변속 운전은 신설 설비는 물론 기 설치된 설비에도 적용이 용이하여 Pump나 Blower등 2승저감 Torque특성을 갖는 부하의 Power Saving을 목적으로 적용을 시도하고 있으나 이에 따른 Engineering 자료 불충분에 따라 실제 적용하고자 하는 자신감 부족으로 적용을 망설이는 예가 흔히 있어 Energy Saving에 대한 기본적인 방향을 제시하고자 한다.

• Journal of IKEEE
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• v.16 no.3
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• pp.197-202
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• 2012

As more and more cores are integrated on a single chip, power consumption has become an important problem in system-on-a-chip (SoC) design. Multiple supply voltage (MSV) design is one of popular solutions to reduce power consumption. We propose a new method that determines voltage level of cores before floorplanning stage. Besides, our algorithm includes a new approach to optimize wire length and the number of level shifters without any significant decrease of power saving. In simulation, we achieved 40-52% power saving and a considerable improvement in runtime, whereas an increase in wire length and area is less than 8%.

• Journal of the Korean Institute of Illuminating and Electrical Installation Engineers
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• v.25 no.12
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• pp.42-47
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• 2011

The design of road lighting is aiming illuminance and luminance requirements for road lighting. In the process, various factors associated with luminaires such as luminous efficacy, light distribution, mounting height, spacing and maintenance factor are considered. However, there has been no restriction on lighting power density. In this study, lighting power density has been comparatively analyzed through a study of related data and a result of measurements on domestic roads. And, it has been analyzed by simulation results for road in which lighting conditions are variable. In terms of the limitation on power density for road lighting, road lighting can be designed using high efficacy lighting systems for energy saving.

• Journal of the Korean Institute of Illuminating and Electrical Installation Engineers
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• v.27 no.10
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• pp.75-79
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• 2013

The automatic quiescent power cut-off receptacles(QPCR from now on) have achieved a noticeable energy saving so far. The government is preparing a new code for wider promotion of the QPCRs. This paper presents a new QPCR that adopts the latch relay instead of the conventional coil-operated relay. Measurement results of the prototype have shown up to 0.22W improvement of quiescent power compared with existing products.

• The Transactions of the Korean Institute of Power Electronics
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• v.17 no.6
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• pp.516-522
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• 2012

Recently trends of home appliance has been changed in house and the demand for functional refrigerator has been increased. Power consumption of refrigerator accounts for a large proportion in consumer electronics. Also, compressor accounts for most of the power consumption in refrigerator parts. Therefore, this paper proposes a multi-refrigerator system with single compressor & condenser fan in order to reduce energy. To verify the availability of the proposed multi refrigerant system, integration experiment is carried out.