• 디지털콘텐츠학회 논문지
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• 제10권2호
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• pp.217-223
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• 2009

XScale PXA255 기반 Embedded Linux 환경에서 전력 소비를 줄이기 위해 DFS(Dynamic Frequency Scaling) 기법의 디바이스 드라이버를 제작하고 이 디바이스 드라이버가 포팅되어 있는 임베디드 타겟보드의 전력을 관리하기 위한 미들웨어 DFM(Dynamic Frequency Management)를 설계하고 구현하여 임베디드 시스템의 전력 소비를 감소하는 방법을 제시한다.

• 대한전기학회:학술대회논문집
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• 대한전기학회 2001년도 춘계학술대회 논문집 전력기술부문
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• pp.129-131
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• 2001

In order to improve the reliability of power service and the effective management of distribution power system. DAS (Distribution Automation system) is widely used in KEPCO(Korea Electric Power Corporation) branch offices. Based on the present protective device coordination program which used in KEPCO. this study presents the new concept about both protective device coordination program maximizing the characteristics of DAS and development plan of protective device auto-coordination program with the merits of DAS.

• 센서학회지
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• 제22권5호
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• pp.364-368
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• 2013

Vibrational energy harvester based on piezoelectricity has been expected to be the dominant energy harvesting technology due to the advantages of high conversion efficiency, light weight and small size, night operation, etc. Its commercialization is just around the corner but the integration with power management electronics should be solved in advance. In this paper, therefore, fully-integrated design environment for piezoelectric energy harvesting systems is presented to assist co-design with the power management electronics. The proposed design environment is capable of analyzing the energy harvester including the package-induced damping effects and simulating the device and its power management electronics simultaneously. When the developed design environment was applied to the fabricated device, the simulated resonant frequency matched well with the experimental result with a difference of 2.97% only. Also, the complex transient response was completed in short simulation time of 3,001 seconds including the displacement distribution over the device geometry. Furthermore, a full-bridge power management circuit was modeled and simulated with the energy harvester simultaneously. Therefore the proposed, fully-integrated design environment is accurate and fast enough for the contribution on successful commercialization of piezoelectric energy harvester.

• Journal of Communications and Networks
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• 제18권4호
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• pp.540-550
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• 2016

Since energy efficiency has become a significant concern for network infrastructure, next-generation network devices are expected to have embedded advanced power management capabilities. However, how to effectively exploit the green capabilities is still a big challenge, especially given the high heterogeneity of devices and their internal architectures. In this paper, we introduce a hierarchical power management architecture (HPMA) which represents physical components whose power can be monitored and controlled at various levels of a device as entities. We use energy aware state (EAS) as the power management setting mode of each device entity. The power policy controller is capable of getting information on how many EASes of the entity are manageable inside a device, and setting a certain EAS configuration for the entity. We propose the optimal local control policy which aims to minimize the router power consumption while meeting the performance constraints. A first-order Markov chain is used to model the statistical features of the network traffic load. The dynamic EAS configuration problem is formulated as a Markov decision process and solved using a dynamic programming algorithm. In addition, we demonstrate a reference implementation of the HPMA and EAS concept in a NetFPGA frequency scaled router which has the ability of toggling among five operating frequency options and/or turning off unused Ethernet ports.

• ETRI Journal
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• 제33권6호
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• pp.973-976
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• 2011

This letter describes an efficient technique for maximum power point tracking (MPPT) of an energy harvesting device. It is based on controlling the device voltage at the point of maximum power. Using a microcontroller with a power saving technique, the MPPT algorithm maintains the maximum power with low power consumption. An experiment shows that the algorithm maximizes the energy transfer power using an energy management IC fabricated in a 0.18-${\mu}m$ process. Compared to direct energy transfer to a battery, the proposed technique is more efficient for low-energy harvesting under variable conditions.

• 한국통신학회논문지
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• 제38B권8호
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• pp.663-671
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• 2013

최근 모바일 디바이스에서 D2D (Device-to-Device) 통신을 가능하게 하는 기술로 WLAN을 이용한 Wi-Fi Direct가 떠오르고 있다. 하지만 제한적인 전력을 사용하는 모바일 디바이스 특성상 전력을 많이 소비하는 WLAN은 에너지 비효율성 문제를 야기할 수 있다. 이러한 문제를 해결하기 위해 Wi-Fi Direct 표준에서는 전력 관리 기법으로 Opportunistic 기법과 Notice of Absence(NoA) 기법을 정의하고 있다. 하지만 표준에서는 각 전력 관리 기법이 어떠한 환경에서 보다 효율적인지에 관한 구체적인 기준을 명시하지 않고 있다. 본 논문에서는 데이터 트래픽 패턴에 따라 두 전력 관리 기법의 성능이나 에너지 효율성이 매우 다른 양상을 보이고 있음을 ns-3 시뮬레이션에 기반한 다양한 실험을 통해 확인하고, 실제 데이터 트래픽 패턴 변화에 따라 전력 관리 기법을 동적으로 변경 하는 기법을 제안한다.

• 마이크로전자및패키징학회지
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• 제20권3호
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• pp.1-6
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• 2013

TSV는 그동안 3D IC 적층을 하는데 핵심 기술로 많이 연구되어 왔고, RC delay를 줄여 소자의 성능을 향상시키고, 전체 시스템 사이즈를 줄일 수 있는 기술로 각광을 받아왔다. 최근에는 TSV를 전기적 연결이 아닌 소자의 열관리를 위한 구조로 연구되고 있다. TSV를 이용한 liquid cooling 시스템 개발은 TSV 제조, TSV 디자인 (aspect ratio, size, distribution), 배선 밀도, microchannel 제조, sealing, 그리고 micropump 제조까지 풀어야 할 과제가 아직 많이 남아있다. 그러나 TSV를 이용한 liquid cooling 시스템은 열관리뿐 아니라 신호 대기시간(latency), 대역폭(bandwidth), 전력 소비(power consumption), 등에 크게 영향을 미치기 때문에 3D IC 적층 기술의 장점을 최대로 이용한 차세대 cooling 시스템으로 지속적인 개발이 필요하다.

• 조명전기설비학회논문지
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• 제28권6호
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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.

• 디지털융복합연구
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• 제19권11호
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• pp.365-371
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• 2021

본 연구에서 고찰되는 가상발전소(VPP; Virtual Power Plant) 솔루션 플랫폼은 전력회사가 발전·송전설비 등의 건설에 소요되는 비용과 이와 관련된 투자리스크를 최소화 한다. 또한, 소비자의 전력 수요를 충족할 수 있도록 수요대응(DR; Demand Response) 프로그램운영 기능을 포함시켜 VPP도입으로 발전 및 송·배전부문에 대한 대규모 설비투자 없이 현존하는 발전기와 DR 프로그램 등을 통해서 소비자의 부하변화에 실시간으로 대처하여 보다 친환경적이고 효율적인 전력공급이 가능하도록 한다. 태양광 및 ESS 연동 장치에 통신 Device를 연동하기 위해서는 Device 장치와 Edge System간 제어·상태에서 데이터를 전달하고 IoT Device 및 연동 플랫폼 개발(OneM2M)이 필요하다.

• 대한임베디드공학회논문지
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• 제2권3호
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• pp.194-201
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• 2007

As the performance of the mobile terminal becomes higher, the power consumption gradually increases. As a result, power management is one of the most important issues in mobile system with battery. In this paper, we describe an DPM(Dynamic Power Management) using DVS(Dynamic Power Management) as a power management mechanism in Qplus operating system. DVS generally considers a specific device such as CPU, whereas we consider the relations with other hardware components as well as each component. We specially focus on the relation between CPU, memory and LCD devices. We also designs a kernel monitor to collect information to decide the policy for power management. According to the experimental results, the proposed method enables to save much power.