• Title/Summary/Keyword: Active unit

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Implementation of High Speed Router's Redundancy Architecture (고속 네트워크 시스템의 이중화 회로 구현)

  • 강덕기;이상우;이준철;이형섭;이영천
    • Proceedings of the IEEK Conference
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    • 2000.11a
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    • pp.267-270
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    • 2000
  • In this paper, we consider the simple redundant structures with the function of hardware based active/standby control. The system includes two switch modules. The switch module is connected to a data bus, but only the active switch module has control of the data bus. The standby unit takes over the function of the active unit when the active unit failure or mode command are asserted. And this paper illustrate the high-speed router system and the overall redundant system architecture. The proposed redundant architecture for 80G Router system is verified and implemented with experiment.

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Analysis of Receiving Strength according to the Attachment Location of RFID tag in Palletized Unit-load of Agricultural Products

  • Jong Min Park;Eon Uck Kang;Hyun Mo Jung
    • KOREAN JOURNAL OF PACKAGING SCIENCE & TECHNOLOGY
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    • v.29 no.3
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    • pp.211-221
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    • 2023
  • This study was conducted as a basic study for the selection of tags suitable for logistics management in the palletized unit-load unit and the development of various technologies to activate the palletized unit-load shipment of agricultural products through local APCs. Three types of passive RFID tags of UHF 900 MHz and one type of active RFID tag of 2.4 GHz band designed and manufactured through this study were used to analyze the receiving strength according to the tag's attachment location and distance of the palletized unit-load of agricultural products. In the passive RFID tag, there was a large difference in receiving strength by the tag's attachment location and a large amount of data loss depending on the distance within 30 m, whereas, in the active RFID tag, it was superior to the passive tags in terms of both receiving strength and data loss. Therefore, active tags are desirable from the perspective of multiple identification of warehouses with large spaces in relation to the application of RFID tags for palletized unit-loads of agricultural products, but the development of low-power technologies such as software wakeup power management as well as hardware to minimize battery power consumption is necessary.

Optimization Design and Development of the Proportional Pressure Control Valve Analysis Model of Active Body Control (차량 자세제어 시스템의 비례압력제어밸브 해석모델 개발 및 최적화 설계)

  • Kim, Dongmyung;Jang, Joosup;Son, Taekwan
    • Transactions of the Korean Society of Automotive Engineers
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    • v.22 no.7
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    • pp.127-134
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    • 2014
  • Active body control system is an important system for determining the driving stability and ride comfort of the vehicle. Active body control system is composed of a cylinder unit power supply unit, and control valve unit. Control valve is a proportional pressure control valve, the dynamic characteristics of the valve affects the performance of the active body control system. We have developed an analytical model, we analyzed the design parameters of the proportional pressure control valve. Further, by knowing the design parameters effect on the system and to optimize the design parameters, and improved performance of the dynamic properties.

The efficient implementation of the multi-channel active noise controller using a low-cost microcontroller unit (저가 microcontoller unit을 이용한 효율적인 다채널 능동 소음 제어기 구현)

  • Chung, Ik Joo
    • The Journal of the Acoustical Society of Korea
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    • v.38 no.1
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    • pp.9-22
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    • 2019
  • In this paper, we propose a method that can be applied to the efficient implementation of multi-channel active noise controller. Since the normalized MFxLMS (Modified Filtered-x Least Mean Square) algorithm for the multi-channel active noise control requires a large amount of computation, the difficulty has lied in implementing the algorithm using a low-cost MCU (Microcontoller Unit). We implement the multi-channel active noise controller efficiently by optimizing the software based on the features of the MCU. By maximizing the usage of single-cycle MAC (Multiply- Accumulate) operations and minimizing move operations of the delay memory, we can achieve more than 3 times the performance in the aspect of computational optimization, and by parellel processing using the auxillary processor included in the MCU, we can also obtain more than 4 times the performance. In addition, the usage of additional parts can be minimized by maximizing the usage of the peripherals embedded in the MCU.

CONFIDENCE LIMITS FOR STEADY STATE AVAILABILITY OF A REDUNDANT SYSTEM

  • Shin, Sang-Wook;Lim, Jae-Hak;Park, Dong-Ho
    • Proceedings of the Korean Reliability Society Conference
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    • 2000.04a
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    • pp.193-200
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    • 2000
  • In this paper, we consider confidence limits for steady state availability of a redundant structure with the function of switchover processing. The system considered in this paper consists of three units which are an active unit, a standby unit and a switchover device. A control module does not affect the performance of the system while the active unit is operating but causes the system failure if the active unit fails at the failure of the control module. The effect of failure of control module is included in our reliability model of the simple redundant structure. The availability of the system is obtained by using the state space method. An example is given to illustrate our results.

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Development of Active Control System for Structural Vibration Using a Hydraulic Actuator (유압식 Actuator를 이용한 구조물 진동의 능동제어시스템 개발)

  • S.J. Moon;T.Y. Chung
    • Journal of the Society of Naval Architects of Korea
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    • v.32 no.1
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    • pp.94-102
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    • 1995
  • The active control system of structural vibration using a hydraulic actuator is developed. The developed system consists of three parts : a hydraulic unit, an actuator unit and a control unit. Structural vibration is sensored by the accelerometer attached to the structure and reduced by the optimally controlled motion of active mass giving anti-phase inertia force to the structure. It is experimentally confirmed that the vibration level of model structure is reduced to about 1/6 by the developed active control system.

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Development of a Tracked Vehicle Model for Real-time Simulation of Semi-active Suspension System (반능동 현수장치의 실시간 시뮬레이션용 궤도차량 모델 개발)

  • 손영일;이종호;송병석
    • Transactions of the Korean Society of Automotive Engineers
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    • v.11 no.4
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    • pp.135-143
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    • 2003
  • In this study, a real-time simulation model was developed for tracked vehicles with in-arm type semi-active hydro-pneumatic suspension unit using MATLAB S-functions. Since the vehicle model uses relative coordinates and massless link elements, the developed model has an enhanced analytic time performance. Through the comparison of simulation results with multi-body software(DADS), the vehicle model is verified. A controller using on-off skyhook control algorithm is designed with the pilot-centre]led proportional valve based on conventional damper characteristics. Exploiting the developed tracked vehicle model with other subsystem model such as a controller model, a suspension unit model, and a test road model, computer simulations are carried out. Control simulation results with the developed tracked vehicle model show that the semi-active suspension control system has a better performance than the conventional suspension system.

A Method to Determine the Droop Constant of DGs Considering the Configuration and Active Power Control Mode (분산전원의 구성 및 출력 제어 방법에 따른 Droop 계수 설정 방법)

  • Ahn, Seon-Ju;Park, Jin-Woo;Chung, Il-Yop;Moon, Seung-Il
    • The Transactions of The Korean Institute of Electrical Engineers
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    • v.57 no.11
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    • pp.1954-1961
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    • 2008
  • Microgrid usually consists of a cluster of distributed generators(DGs), energy storage systems and loads, and can operate in the grid-connected mode and the islanded mode. This paper presents detailed descriptions of two different options for controlling the active power of DGs in the microgrid. One is regulating the power injected by the unit to a desired amount(Unit output power control) and the other is to regulate the flow of active power in the feeder where the unit is installed to a constant(Feeder flow control). Frequency-droop characteristics are used to achieve good active power sharing when the microgrid operates in the islanded mode. The change in the frequency and the active power output of DGs are investigated according to the control mode and the configuration of DGs when the microgrid is disconnected from the main grid. From the analysis, this paper proposes a method to determine the droop constant of DGs operating in the feeder flow control mode. Simulation results using the PSCAD/EMTDC are presented to validate the approach, which shows good performance as opposed to the conventional one.

A STUDY ON PERIODONTAL DISEASE SEVERITY AND MYELOPEROXIDASE IN GINGIVAL CREVICULAR FLUID (치주질환 심도와 치은열구액내 Myeloperoxidase에 관한 연구)

  • Choi, Byung-Son;Kwack, Jung-Minn;Kim, Hyung-Seop
    • Journal of Periodontal and Implant Science
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    • v.25 no.3
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    • pp.733-740
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    • 1995
  • This investigation was undertaken to determine the relationship between the amount of polymorphonuclear leukocyte(PMN) enzyme myeloperoxidase(MPO) in gingival crevicular fluid(GCF) collected from active or control site and gingival disease status described by clinical indices(gingival index, papillary bleeding index, pocket depth, periotron unit). The results were as follows : 1. MPO activity/site was greater at active sites than at control sites. 2. According to increasing the clinical parameters, MPO/sites was higher statistically (P<0. 01, P<0.05). 3. High MPO(unit/site) groups was higher statistically than low MPO(unit/site) groups in various clinical parameters. 4. Correlation coefficients between MPO(unit/site) and GI, MPO($unit/{\mu}l$ GCF) and periotron unit were 0.4782, -0.5901, respectively.

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Active Matrix OLED Displays with High Stability and Luminous Efficiency by New Doping Method

  • Shibata, Kenichi;Hamada, Yuji;Kanno, Hiroshi;Takahashi, Hisakazu;Mameno, Kazunobu
    • 한국정보디스플레이학회:학술대회논문집
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    • 2003.07a
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    • pp.4-6
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    • 2003
  • We have developed the active matrix OLED displays with a high efficiency red emission material which uses an emitting assist (EA) dopant system. The EA dopant (rubrene) did not itself emit but assisted the energy transfer from the host ($Alq_s$) to the red emitting dopant(DCM2). A stable red emission (chromaticity coordinates: x=0.64, y=0.36) was obtained in this cell within the luminance range of 100 - 4000 $cd/m^2$ By using EA dopant system, we can realize the reduction of the power consumption of the OLED display..

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