• Title/Summary/Keyword: Power Saving Control

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Dynamic ATIM Power Saving Mechanism(DAPSM) in 802.11 Ad-Hoc Networks (802.11 Ad-Hoc 네트웍에서 Power Save Mechanism을 개선한 DAPSM 알고리즘)

  • Park, Jae-Hyun;Lee, Jang-Su;Kim, Sung-Chun
    • The KIPS Transactions:PartC
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    • v.14C no.6
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    • pp.475-480
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    • 2007
  • Recently, wireless networking devices that depend on the limited Battery and power-saving of wireless hosts became important issue. Batteries can provide a finite amount of energy, therefore, to increase battery lifetime, it is important to design techniques to reduce energy consumption by wireless hosts. This paper improved power saying mechanism in Distributed Coordination Function(DCF) of IEEE 802.11. In the IEEE 802.11 power saving mechanism specified for DCF, time is divided into so-called beacon intervals. At the start of each beacon interval, each node in the power saving mode periodically wakes up during duration called the ATIM Window. The nodes are required to be synchronized to ensure that all nodes wake up at the same time. During the ATIM window, the nodes exchange control packets to determine whether they need to stay awake for the rest of the beacon interval. The size of the ATIM window has considerably affected power-saving. This paper can provide more power-saving than IEEE 802.11 power saving mode because ATIM window size is efficiently increased or decreased.

Design and Implementation of Optimal Control Algorithms for Building Energy Management (빌딩 에너지 관리 최적화 알고리즘 설계 및 구현)

  • Jin Jung-Hwa;Chung Sun-Tae
    • Korean Journal of Air-Conditioning and Refrigeration Engineering
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    • v.16 no.10
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    • pp.969-976
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    • 2004
  • Building energy saving is one of the most important issues in these days. Energy saving control strategies should be developed properly to achieve the saving. One of such area we could apply is the HVAC (Heating, Ventilation and Air-Conditioning) system. Through the optimal control algorithm for building energy management system (EMS), you can not only save the cost of building energy, but also protect HVAC system components against the unexpected condition. In order to verify the effectiveness of building energy saving, field test was accomplished for several months at 'A' building. And to get the measured data, remote control was used. If the remote control is used in BAS (Building Automation System), control and monitoring can be done for all of the building systems, such as HVAC, power, lighting, security and fire-alarm etc. anywhere any time. Using the remote control, Control and monitoring is possible for the testing system without going there. As the results of field test, we could reduce $5{\sim}10\%$ of the building energy cost.

Utility AC Frequency to High Frequency AC Power Frequency Converter without Electrolytic Capacitor Link for Consumer Induction Heating Appliances

  • Sugimura, H.;Eid, A.;Lee, H.W.;Kwon, S.K.;Suh, K.Y.;Nakaoka, M.
    • Proceedings of the KIEE Conference
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    • 2005.07b
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    • pp.1364-1367
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    • 2005
  • In this paper, a novel prototype topology of soft switching PWM controlled high frequency AC power conversion circuit without DC voltage smoothing chemical capacitor filter link from the voltage grid of utility frequency AC power supply source with 60Hz-100V or 60Hz-200V is proposed and introduced for innovative consumer induction heating(IH) boiler applications as hot water producer, steamer and super heated vapor steamer.

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Development of Android Startup Program and Power Synchronous Algorithm for IPTV Set-Top Box (안드로이드 시작프로그램과 IPTV-셋톱박스의 전원 동기화 알고리즘 개발에 관한 연구)

  • Kim, Bong-Hyun;Cho, Joon-Ho
    • Journal of the Korea Convergence Society
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    • v.10 no.12
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    • pp.1-6
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    • 2019
  • In this paper, we have developed an app that can control IPTV - Miracast and the Internet with Android 7.0 on the embedded board. The app can be controlled by the remote control of IPTV and can receive TV when using IPTV. And Miracast and Embedded board are put into the power saving mode. When one mode is selected in this way, the other two modes enter the power saving mode and the power saving control technology is applied to reduce energy consumption. The board used in this paper was Android version 7.1.2 version of Raspberry pie 3B / B + and Asus Tinker board s, and Android Studio program was used to make the app and a synchronization control program was also developed to operate with IPTV remote control. The operation of the Android start program using the power saving power control technology and the remote control synchronization control program developed in this way is confirmed to be normal operation as a result of applying to the actual IPTV.

Path Control with Energy-Saving Load-Sensing for a Cylinder-Load System Using Speed-Controlled Fixed Displacement Pump (속도제어-정용량 펌프를 사용하는 실린더-부하계의 에너지절약-부하감지형 경로제어)

  • Cho, S.H.
    • Transactions of The Korea Fluid Power Systems Society
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    • v.6 no.3
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    • pp.16-22
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    • 2009
  • This paper deals with the issue of robust position tracking control and energy-saving control for a valve-controlled cylinder system using speed-controlled fixed displacement pump. The whole feedback control system is composed of a pair of interconnected subsystems, that is, valve-controlled cylinder system and load-sensing control system. From experiments it is shown that position tracking control in the load sensing control system can accomplish significant reduction in input energy to pump comparing to a conventional valve-controlled cylinder system, while exhibiting the same position tracking control accuracy.

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A Study on Cycle Time and Power Saving Effect of a Hydraulic Hybrid Injection Molding Machine using a Servo Motor (서보모터를 이용한 유압 하이브리드식 사출성형기의 공정시간 및 절전효과에 관한 연구)

  • Yun, Hongsik;Kim, Sungdong
    • Journal of Drive and Control
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    • v.17 no.3
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    • pp.15-25
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    • 2020
  • The cycle time and power saving effect of a hydraulic hybrid injection molding machine using a servo motor are considered in this paper. In order to verify control characteristics, such as pressure and speed, experiments were performed with the hydraulic hybrid injection molding machine, clamping force of 110 ton. The power consumption and production cycle time of a conventional hydraulic injection molding machine were measured to compare its performances with the hydraulic hybrid injection molding machine. An injection molding machine with a clamping force of 1300 ton was used as the conventional machine, the hybrid machine was implemented by replacing its induction motors with servo motors. In the remodeled hybrid machine, experiments were performed to investigate how the displacement of the mold clamping pump affects the power consumption and production cycle time. The results showed that the production cycle time of the hybrid injection molding is similar to a conventional hydraulic injection molding machine but with a significant energy saving of about 40%.

Design and Performance Analysis of a Traffic-based Power Saving Mode Decision Algorithm for Energy-efficient Home Networks (에너지 효율적인 홈 네트워크를 위한 트래픽 기반 전력 절감 모드 결정 알고리즘의 설계 및 성능 분석)

  • Kong, In-Yeup;Hwang, Won-Joo
    • Journal of Korea Multimedia Society
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    • v.11 no.10
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    • pp.1392-1402
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    • 2008
  • Home gateway is always full-powered for ubiquitous home services, and consumes much energy yearly. Power-saving algorithm to conserve this energy must reduce the energy consumption and preserve always-on services. Our algorithm predicts current idle period using the history of the past idle period when the idle period starts, and then determines whether the power mode is changed to the saving mode or not. On the power saving mode, it processes the simple protocol data for network control using proxying with no wakeup. And it changes the power mode to active mode when user's traffic exists. As the results of the simulation using real traffic, our algorithm saves the energy consumption from 14% to 49% as compared with existing method.

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A Study on Control and Monitoring System for Building Energy Management System

  • Oh, Jin-Seok;Bae, Soo-Young
    • Journal of Advanced Marine Engineering and Technology
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    • v.35 no.3
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    • pp.335-340
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    • 2011
  • Building energy saving is one of the most important issues in these days. Control algorithm for energy saving should be designed properly to reduce power consumption in building. Recently, building energy system consists of hybrid energy system coupling with RE (Renewable Energy) source. In this paper, an optimum control algorithm for building energy saving is applied to BEMS (Building Energy Management System) by using an outdoor air temperature prediction strategy. BEMS coupling with renewable energy can control HVAC (Heating, Ventilating and Air-Conditioning) system effectively. In order to verify the effectiveness of building energy saving, BEMS was tested for several months at a laboratorial chamber with an air conditioner, fan and heater. To this end BEMS embedded control algorithm has been tested successfully.

Design of a Remote Lighting Control System Using Time Division Multiplex Transmission (시분할 다중 전송방식을 이용한 원격 조명제어 설계)

  • 정성재;김일환
    • 제어로봇시스템학회:학술대회논문집
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    • 2000.10a
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    • pp.33-33
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    • 2000
  • In this paper a new distributive control system for BA(Building Automation ) lighting control used on general microprocessors is presented. For optimal lighting control and saving energy, The system have to control the group and pattern lighting control as well as individual light control at one time. Tn this paper, This functions are accomplished with low-cost and simple microprocessor. A plurality of modulated light control terminals are connected to the central control unit through a pair of power line. This power line provide both power and signal to the each terminal and the data is transmitted through cyclic time division multiplex transmission. With this structure a low-cost distributive control system for lighting applications has been achieved, allowing energy and maintenance saving and reliability increase of the light control system.

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A Novel Power Frequency Changer Based on Utility AC Connected Half-Bridge One Stage High Frequency AC Conversion Principle

  • Saha Bishwajit;Koh Kang-Hoon;Kwon Soon-Kurl;Lee Hyun-Woo;Nakaoka Mutsuo
    • Proceedings of the KIPE Conference
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    • 2006.06a
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    • pp.203-205
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    • 2006
  • This paper presents a novel soft-switching PWM utility frequency AC to high frequency AC power conversion circuit incorporating boost-half-bridge inverter topology, which is more suitable and acceptable for cost effective consumer induction heating applications. The operating principle and the operation modes are presented using the switching mode and the operating voltage and current waveforms. The performances of this high-frequency inverter using the latest IGBTs are illustrated, which includes high frequency power regulation and actual efficiency characteristics based on zero voltage soft switching (ZVS) operation ranges and the power dissipation as compared with those of the previously developed high-frequency inverter. In addition, a dual mode control scheme of this high frequency inverter based on asymmetrical pulse width modulation (PWM) and pulse density modulation (PDM) control scheme is discussed in this paper in order to extend the soft switching operation ranges and to improve the power conversion efficiency at the low power settings. The power converter practical effectiveness is substantially proved based on experimental results from practical design example.

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