• Journal of the Korea Institute of Information and Communication Engineering
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• v.10 no.10
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• pp.1804-1809
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• 2006

The aim of this Paper is to describe the implementation of a low-power digital front-End Design (FED) that will act as the core of a stand-alone Power dissipation methodology. The design of digital integrated circuits is a large and diverse area, and we have chosen to focus on low power FED. Designs are made from synthesized logic, and we need to consider the low power digital FED including input clock, buffer, latches, voltage regulator, and capacitance-to-voltage counter which have been integrated onto hish bandwidth communication chips and system. These single- chip micro instruments, implemented in a 0.12um CMOS technology operate with a single 0.9V supply voltage, and can be used to monitor dynamic and static power dissipation, Vesture, acceleration junction temperature (Tj), etc.

• Proceedings of the Korea Information Processing Society Conference
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• 2017.04a
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• pp.183-184
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• 2017

최근, 모바일 디바이스 성능 고도화로 인해 내장된 컴퓨팅 및 스토리지 자원을 이용한 다양한 연구가 활발히 진행되고 있다. 그러나 모바일 디바이스내 제한된 배터리량으로 인해 개발된 많은 어플리케이션을 동작하는 데 원활하지 못한 문제점을 가진다. 최근 연구는 어플리케이션의 몰입감 및 모바일 디바이스의 자체 성능 최적화에 대한 연구가 집중되어 있다. 현재, 분산된 모바일 디바이스내 비가용 유휴 자원을 활용한 연구가 미흡한 단계로 모바일 디바이스의 자원 고가용성을 위한 자원 관리 연구가 필요하다. 기존에 모바일 자원 통합 기법인 Mobile Resource Management(MRM)가 연구되었지만, 작업량 증가에 따라 인프라내 특정 모바일 디바이스의 배터리 소모가 급격히 소모되는 문제점을 내재한다. 따라서 본 논문에서는 MRM 인프라내 특정 모바일 디바이스의 급격한 배터리 소모 방지를 위해 모의적으로 모바일 디바이스 연결 및 작업 수행하여 최적의 작업 분배를 위한 MBC-Sim을 제안한다.

• Journal of the Korea Academia-Industrial cooperation Society
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• v.14 no.12
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• pp.6469-6477
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• 2013

As the Internet has grown, energy consumption and GHG emission from internet use have become issues in recent years. On the other hand, such interest in greening the Internet has focused on edge devices, and there is a lack of deeper related studies of the energy wasted by excessive network-connectivity and the savings potential in wired network equipment. This study presents the background and reasonability of studies on the energy efficiency of wired networks in terms of the environment, economy and energy resources. The energy consumption and savings potential of network equipment were also estimated and the major factors of energy consumption was analyzed based on the data, and future studies for the Internet are presented.

• Journal of the Korea Institute of Military Science and Technology
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• v.21 no.4
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• pp.529-540
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• 2018

As the equipment of the military has recently become more sophisticated and expensive, the cost of purchasing spare parts is also steadily increasing. Therefore, demand forecast accuracy is also becoming an issue for the effective execution of the spare parts budget. This study predicts the demand by using the data of spare parts consumption of the KF-16C fighter which is being operated in the Republic of Korea Air Force. In this paper, SARIMA(Seasonal Autoregressive Integrated Moving Average) is applied to seasonal data after dividing the spare parts consumptions into seasonal data and non-seasonal data. Proposing new methods, Majority Voting and Hybrid Method, to the non-seasonal data which consists of spare parts of low consumption with unclear pattern, We want to prove that the demand forecast accuracy of spare parts improves.

• The Journal of Korean Institute of Communications and Information Sciences
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• v.36 no.5A
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• pp.502-510
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• 2011

In this paper, we propose a slot scheduling algorithm for balancing power consumption in tree-based sensor networks. In this type of networks, nodes with lower depths tend to consume more energy than those with higher depths, thereby reducing the life time of the network. The proposed algorithm allocates a series of receiving slots first and then a series of sending slots. This way of slot allocation eases packet aggregation and filtering, and thus reduces traffic load on nodes near a sink. We compare the proposed algorithm and the frame-slot allocation algorithm employed in the TreeMAC by resorting to simulation. The simulation results showed that the proposed approach well achieves the balancing of power consumption.

• Journal of the Korea Society of Computer and Information
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• v.19 no.4
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• pp.25-33
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• 2014

This paper proposes a power-efficient scheduling scheme that stochastically minimizes the power consumption of real-time tasks while meeting their deadlines on multicore processors. In the proposed scheme, uncertain computation amounts of given tasks are translated into probabilistic computation amounts based on their past completion amounts, and the mean power consumption of the translated probabilistic computation amounts is minimized with a finite set of discrete clock frequencies. Also, when system load is low, the proposed scheme activates a part of all available cores with unused cores powered off, considering the leakage power consumption of cores. Evaluation shows that the scheme saves up to 69% power consumption of the previous method.

• Journal of the Institute of Electronics and Information Engineers
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• v.51 no.2
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• pp.3-9
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• 2014

We propose energy efficient transmit and receive strategies for nomadic M2M devices. Recently, communication applications consume more and more battery. Hence, the efficient battery management is becoming increasingly important. Turbo code as a channel coding is being widely used in many communication areas. Accordingly, the efficient energy management in using turbo code is an important issue. In this paper, we optimize joint transmit and receive energy for M2M devices pair. We first model the transmit energy and receive energy. Then, we develop the energy efficient transmit and receive strategies.

• Proceedings of the Korean Institute of Information and Commucation Sciences Conference
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• 2011.05a
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• pp.382-385
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• 2011

The sensor network technology for core technology of ubiquitous computing is in the spotlight recently, the research on sensor network is proceeding actively which is composed many different sensor node. One of the important condition for design of sensor node is to extend for network life which is to minimize power-consumption under the limited resources of sensor network. This study suggest routing protocol that was used second level cluster structure to reduce power-consumption of sensor node. the first level use the previous routing protocol under the LEACH, second level decide to transmit or not by comparision of data value for Effective Usage, reduce the unnecessary power-consumption.

• The Journal of Korean Institute of Communications and Information Sciences
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• v.31 no.8A
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• pp.790-797
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• 2006

IEEE 802.16e specifies two different power saving modes(PSM). One is sleep mode and the other is idle mode. These modes are different in that whether a mobile node maintains its state information with the serving base station or not. This difference results in different efficiency in consuming battery power of a mobile terminal. Therefore, it becomes important to analyze the performance of each power saving mode considering the parameters affecting the power consumption. In this paper, we propose a performance modeling framework of sleep mode and idle mode in terms of power saving efficiency. The analytical results are verified by computer simulations that idle mode is superior to sleep mode in power consumption of mobile node.

• Journal of IKEEE
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• v.13 no.3
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• pp.39-46
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• 2009

Wireless sensor networks consist of small, autonomous devices with wireless networking capabilities. In order to further increase the applicability in real world applications, minimizing energy consumption is one of the most critical issues. Therefore, accurate energy model is required for the evaluation of wireless sensor networks. In this paper we analyze the power consumption for wireless sensor networks. To develop the power consumption model, we have measured the power characteristics of commercial Kmote node based on TelosB platforms running TinyOS. Based on our model, the estimated lifetime of a battery powered sensor node can use about 6.9 months for application of human detection using PIR sensors. This result indicates that sensor nodes can be used in a monitoring system for elderly living alone.