• Title/Summary/Keyword: Redundant Network

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A Design of Control Network for DCS in Nuclear Power Plant (원전 DCS용 제어통신망 설계)

  • 이재민;박태림;문홍주;권욱현
    • Proceedings of the IEEK Conference
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    • 2000.06a
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    • pp.85-88
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    • 2000
  • Distributed Control System(DCS) is one of the best solutions to implement control systems because it provides continuous observation of control process and execution of commands to induce proper operations. In this paper, a design of control network for DCS in nuclear power plant is proposed. The proposed control network on DCS has a simple architecture and deterministic property. Thus, the proposed control network offers hard real-time periodic service. It also has redundant media for the fault-tolerance. As a result, high safety and reliability required in nuclear power plant are guaranteed.

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Elimination of the Redundant Sensor Data using the Mobile Agent Middleware (이동 에이전트 미들웨어를 이용한 중복 센서 데이터 제거)

  • Lee, Jeong-Su;Lee, Yon-Sik
    • Journal of Internet Computing and Services
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    • v.12 no.3
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    • pp.27-36
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    • 2011
  • The sensor nodes of sensor network system are capable of wireless communication with sink nodes. They also acquire and transmit sensor data in broad region where people cannot access easily. However, the transmission of redundant data from sensor nodes reduces the lifetime of the entire system and substantial amount of resulted data needs to be resorted before implementing them to the specific applications. In this paper, the mobile agent middleware to eliminate the redundant sensor data is designed and implemented. In the proposed system, the mobile agent visits the destination sensor nodes according to the migration list offered by the meta table in the name space of the naming agent, eliminates the redundant sensor data corresponding to user condition, and acquires and transmits sensor data according to the purpose and needs. Thus, the excess transmission of the sensor data is avoided and the lifetime of the entire system can be extended. Moreover, the experiments using the mobile agent middleware with the conditions and limitations that are possible in real situation ore done to verify the successful elimination of the redundant sensor data and the efficiency of the data acquisition. Also, we show the potential applicability of the mobile agent middleware in various active sensor networks through the active rule based mobile agent middleware or the interaction with the active rule system.

Efficient Content Sharing using the Selection of Minimum Forwarding Peers in an Ad Hoc Network (최소의 Forwarding Peer 선택을 통한 애드 혹 네트워크에서의 효율적 콘텐츠 분배 방법)

  • Kang, Seung-Seok
    • Journal of the Korea Society for Simulation
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    • v.18 no.4
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    • pp.165-173
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    • 2009
  • Recent portable devices are so versatile that they have multiple communication channels and play several multimedia formats. Especially, many services are under development for users who connect Internet or nearby devices via WWAN (Wireless Wide Area Network) and/or WLAN (Wireless LAN). In case of paying the telecommunication cost proportional to the amount of data downloaded, it is necessary to reduce the cost by constructing a special ad hoc network in which each participating peer downloads a specific portion of the want-to-be-shared content over the payable WWAN channel and exchanges the remaining portion with other peers using the cost-free WLAN channel. If all peers participate in forwarding packets, some transmissions are redundant which results in the unnecessary consumption of bandwidth as well as the delayed content distribution time. In order to reduce the redundant transmission, this paper proposes both the excluding method which discourages some peers not to forward redundant packets, and the minimum cover set method in which only the minimum number of peers are in charge of forwarding packets. These two methods obviate redundant packet forwarding, and result in reduction of content distribution time by up to around 29%.

Design and Fault Tolerant Routing Scheme of Dual Network in Parallel Processing System (병렬처리 시스템에서의 Dual 네트워크의 설계 및 오류허용 라우팅 전략)

  • 최창훈;김성천
    • The Journal of Korean Institute of Communications and Information Sciences
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    • v.19 no.6
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    • pp.1169-1181
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    • 1994
  • The Gamma Network contains the redundant path thereby is provides the ability to tolerate the faults occured. However, in case of identical the source and destination number, only a single path exists, therefore there is no way of connecting for the fault situation. In addition, for the dynamic packet routing strategy, it shoed perform backtracking analysis to find the redundant path. In this paper we proposed a new network, Dual Network, to resolve these drawbacks. The Dual Network uses switching elements about the same network size as the Gamma Network except first and last stage, and it is more efficient than the Gamma Network, for it has reduced the switching stage by one. And since is used a destination tag routing scheme for the control algorithm, it has on advantage of becoming of simpler and faster routing control.

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A Protocol Analysis Platform for the WTB Redundancy in Train Communication Network(TCN) (철도차량 통신 네트워크(TCN)에서의 WTB 이중화에 대한 프로토콜 분석 플랫폼)

  • Choi, Seok-In;Shon, Jin-Geun
    • The Transactions of the Korean Institute of Electrical Engineers P
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    • v.62 no.1
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    • pp.23-29
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    • 2013
  • TCN(train communication network) standard was approved in 1999 by the IEC (IEC 61375-1) and IEEE (IEEE 1473-T) organizations to warrant a reliable train and equipment interoperability. TCN defines the set of communication vehicle buses and train buses. The MVB(multifunction vehicle bus) defines the data communication interface of equipment located in a vehicle and the WTB(wire train bus) defines the data communication interface between vehicles. The WTB and each MVB will be connected over a node acting as gateway. Also, to support applications demanding a high reliability, the standard defines a redundancy scheme in which the bus may be double-line and redundant-node implemented. In this paper we have presented protocol analysis platform for the WTB redundancy which is part of TCN system, to verify communication state of high-speed trains. As a confirmation of its validity, the technology described in this paper has been successfully applied to state monitoring and protocol verification of redundancy WTB based on TCN.

Implementation of redundant MAP system (MAP 이중화 시스템의 구현)

  • Moon, Hong-Ju;Park, Hong-Sung;Kim, Won-Cheol;Park, Jung-Woo;Ahn, Sang-Cheol;Woo, Won-Sik;Kwon, Wook-Hyun
    • Proceedings of the KIEE Conference
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    • 1992.07a
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    • pp.248-251
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    • 1992
  • In this paper, the RedMAP, i.e. a redundant Mini-MAP system for high reliability is proposed. Redundancy is implemented for LLC, MAC, and Physical layer of ISL-Mini -MAP. The detection of error of the network, the broadcasting of the error event, and the network change sequence are three major functions for the dualized Mini-MAP system. The abnormal operation of the network is mainly detected indirectly with the function of the TBC( token bus controller). The time delay to be required for the change of the networks must be minimized. With the RedMAP, we can achieve successful transmission only with short additional recovery time.

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Implementation of IEEE 1451 based Dual CAN Module for Fault Tolerance of In-Vehicle Networking System (차량 네트워크 시스템의 결함 허용을 위한 IEEE 1451 기반 중복 CAN 모듈의 구현)

  • Lee, Jong-Gap;Kim, Man-Ho;Park, Jee-Hun;Lee, Suk;Lee, Kyung-Chang
    • Journal of Institute of Control, Robotics and Systems
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    • v.15 no.7
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    • pp.753-759
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    • 2009
  • As many systems depend on electronics in an intelligent vehicle, concern for fault tolerance is growing rapidly. For example, a car with its braking controlled by electronics and no mechanical linkage from brake pedal to calipers of front tires(brake-by-wire system) should be fault tolerant because a failure can come without any warning and its effect is devastating. In general, fault tolerance is usually designed by placing redundant components that duplicate the functions of the original module. In this way a fault can be isolated, and safe operation is guaranteed by replacing the faulty module with its redundant and normal module within a predefined interval. In order to make in-vehicle network fault tolerant, this paper presents the concept and design methodology of an IEEE 1451 based dual CAN module. In addition, feasibility of the dual CAN network was evaluated by implementing the dual CAN module.

Power control protocol for reduction of energy consumption in Wireless Sensor Netoworks (무선 센서 네트워크 환경에서 노드의 에너지 소비 절감을 위한 파워 제어 프로토콜)

  • Han Jung-ahn;Kim Yn-hyng;Kim Byung-gi
    • The Journal of Korean Institute of Communications and Information Sciences
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    • v.30 no.1A
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    • pp.28-36
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    • 2005
  • Wireless Sensor Networks are the technology, in which various applications such as surveillance and information gathering are possible in the uncontrollable area of human. And numerous studies are being processed for the application of ubiquitous network environment. One of major issues in sensor network is the research for prolonging the lifetime of nodes through the use of various algorithms, suggested in the mac and routing layer. In this paper, aiming at reducing energy waste, caused by redundant transmission and receipt message, we propose the mac protocol using active signal and analysis performance through simulation.

A solution to the inverse kinematic by using neural network (신경회로망을 사용한 역운동학 해)

  • 안덕환;이종용;양태규;이상효
    • 제어로봇시스템학회:학술대회논문집
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    • 1989.10a
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    • pp.124-126
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    • 1989
  • Inverse kinematic problem is a crucial point for robot manipulator control. In this paper, to implement the Jacobian control technique we used the Hopfield(Tank)'s neural network. The states of neurons represent joint veocities, and the connection weights are determined from the current value of the Jacobian matrix. The network energy function is constructed so that its minimum corresponds to the minimum least square error. At each sampling time, connection weights and neuron states are updated according to current joint position. Inverse kinematic solution to the planar redundant manipulator is solved by computer simulation.

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A Video Pictures-based Error Control Method for Improving Resources Efficiency over Wireless Networks (무선 네트워크 자원 효율 향상을 위한 비디오 픽처 기반 오류 제어 기법)

  • Sohn, Yejin;Lee, Woong-Jae;Paik, Jong-Ho
    • Journal of Advanced Navigation Technology
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    • v.18 no.1
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    • pp.67-73
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    • 2014
  • Due to the development of the communication technology and the high-performance mobile device, the number of video streaming service user has been increasing. Video streaming services in the restricted network environments need error control to support users for the Ultra High Definition(UHD) video delivery. Packet-level FEC method was used to control the error for delay-sensitive video service, but it has a defect in huge occupation of network resources by redundant packets. In this paper, we proposed a packet-level FEC algorithm which maintains the video quality by previous FEC methods and also reduces the occupation of network resource in the restricted network environments. The proposed algorithm controls the redundant rate with using the delivery characteristic of the video coding technology, and improves the efficiency of network resources by reducing the traffic by around 33% in comparison with the previous FEC methods.