• Title/Summary/Keyword: Electrical network

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SDN 환경에서 Hopfield Network 알고리즘을 이용한 분산 컨트롤러 (Distributed controller using Hopfield Network algorithm in SDN environment)

  • 유승언;김동현;이병준;김경태;윤희용
    • 한국컴퓨터정보학회:학술대회논문집
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    • 한국컴퓨터정보학회 2019년도 제59차 동계학술대회논문집 27권1호
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    • pp.43-44
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    • 2019
  • 본 논문에서는 머신러닝 알고리즘 중 하나인 Hopfield Network 알고리즘을 이용하여 SDN 환경에서 분산된 컨트롤러를 선택하는 모델을 제안하였다. Hopfield Network 알고리즘은 신경망의 물리적 모델로써 최적화, 연상기억 등에 사용되는데 이를 통해 효율적인 컨트롤러 동기화를 기대한다.

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광역 방어시스템의 통신 트래픽 모사와 분석 (Simulation and Analysis of the Network Traffic of a Power Infrastructure Defense System)

  • 백윤기;이건영
    • 대한전기학회:학술대회논문집
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    • 대한전기학회 2006년도 제37회 하계학술대회 논문집 A
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    • pp.179-180
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    • 2006
  • The real time monitoring of the power systems covering wide area are essential for the stable operation and control of the power system. Synchronized phasor measurement is a key for the precise monitoring and control of the power systems. In this paper, to suggest an appropriate network topology of Power Infrastructure Defense System(PIDS) and to estimate the maximum network bandwidth with using the network analyzer, we simulate a PIDS and analyze the network traffic.

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Ethernet Algorithm for Building Network Integration Using TCP/IP

  • Chang Kyung-Bae;Shim Il-Joo;Park Gwi-Tae
    • International Journal of Control, Automation, and Systems
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    • 제4권1호
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    • pp.63-69
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    • 2006
  • Problems like poor security, transfer delay or packet loss occur while building network systems that are applied with TCP/TP integrate with data network systems. To solve this problem, this paper proposes the Separated Ethernet, which can give priority to the system, and by using the OPNET Modeler simulator, we will verify its performances.

Universal learning network-based fuzzy control

  • Hirasawa, K.;Wu, R.;Ohbayashi, M.
    • 제어로봇시스템학회:학술대회논문집
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    • 제어로봇시스템학회 1995년도 Proceedings of the Korea Automation Control Conference, 10th (KACC); Seoul, Korea; 23-25 Oct. 1995
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    • pp.436-439
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    • 1995
  • In this paper we present a method to construct fuzzy model with multi-dimension input membership function, which can construct fuzzy inference system on one node of the network directly. This method comes from a common framework called Universal Learning Network (ULN). The fuzzy model under the framework of ULN is called Universal Learning Network-based Fuzzy Inference System (ULNFIS), which possesses certain advantages over other networks such as neural network. We also introduce how to imitate a real system with ULN and a control scheme using ULNFIS.

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An Autonomous Optimal Coordination Scheme in a Protection System of a Power Distribution Network by using a Multi-Agent Concept

  • Hyun, Seung-Ho;Min, Byung-Woon;Jung, Kwang-Ho;Lee, Seung-Jae;Park, Myeon-Song;Kang, Sang-Hee
    • KIEE International Transactions on Power Engineering
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    • 제2A권3호
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    • pp.89-94
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    • 2002
  • In this paper, a protection system using a Multi-Agent concept for power distribution networks is proposed. Every digital over current relay(OCR) is developed as an agent by adding its own intelligence, self-tuning and communication ability. The main advantage of the Multi-Agent concept is that a group of agents work together to achieve a global goal which is beyond the ability of each individual agent. In order to cope with frequent changes in the network operation condition and faults, an OCR agent, suggested in this paper, is able to detect a fault or a change in the network and find its optimal parameters for protection in an autonomous manner considering information of the whole network obtained by communication between other agents. Through this kind of coordination and information exchanges, not only a local but also a global protective scheme is completed. Simulations in a simple distribution network show the effectiveness of the suggested protection system.

Algorithm for Reducing the Effect of Network Delay of Sensor Data in Network-Based AC Motor Drives

  • Chun, Tae-Won;Ahn, Jung-Ryol;Lee, Hong-Hee;Kim, Heung-Geun;Nho, Eui-Cheol
    • Journal of Power Electronics
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    • 제11권3호
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    • pp.279-284
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    • 2011
  • Network-based controls for ac motor drive systems are becoming increasingly important. In this paper, an ac motor control system is implemented by a motor control module and three sensor modules such as a voltage sensor module, a current sensor module, and an encoder module. There will inevitably be network time delays from the sensor modules to the motor control system, which often degrades and even destabilizes the motor drive system. As a result, it becomes very difficult to estimate the network delayed ac sensor data. An algorithm to reduce the effects of network time delays on sensor data is proposed, using both a synchronization signal and a simple method for estimating the sensor data. The algorithm is applied to a vector controlled induction motor drive system, and the performance of the proposed algorithm is verified with experiments.

상호침입망목 에폭시 복합재료의 교류절연파괴 특성 및 기계적 특성에 관한 연구 (A study on the AC dielectric breakdown characteristics and mechanical characteristics of interpenetraing polymer network epoxy composites)

  • 손인환;이덕진;김명호;김경환;김재환
    • E2M - 전기 전자와 첨단 소재
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    • 제9권7호
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    • pp.702-707
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    • 1996
  • In this paper, in order to improve the withstand voltage properties of epoxy resin, IPN(interpenetrating polymer network) method was introduced and the influence was investigated. The single network structure specimen(E series), simultaneous interpenetrating polymer network specimen(EM series) and pseudo interpenetrating polymer network(EMP series) specimen were manufactured. In order to understand the internal structure properties, scanning electron microscopy method was utilized, and glass transition temperature was measured. Also, AC voltage dielectric breakdown strength, tensile strength and impact strength were measured to investigate the influence upon electrical and mechanical properties. As a result, it was confirmed that simultaneous interpenetrating polymer network specimen was the most execellent.

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FENC: Fast and Efficient Opportunistic Network Coding in wireless networks

  • Pahlavani, Peyman;Derhami, Vali;Bidoki, Ali Mohammad Zareh
    • KSII Transactions on Internet and Information Systems (TIIS)
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    • 제5권1호
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    • pp.52-67
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    • 2011
  • Network coding is a newly developed technology that can cause considerable improvements in network throughput. COPE is the first network coding approach for wireless mesh networks and it is based on opportunistic Wireless Network Coding (WNC). It significantly improves throughput of multi-hop wireless networks utilizing network coding and broadcast features of wireless medium. In this paper we propose a new method, called FENC, for opportunistic WNC that improves the network throughput. In addition, its complexity is lower than other opportunistic WNC approaches. FENC utilizes division and conquer method to find an optimal network coding. The numerical results show that the proposed opportunistic algorithm improves the overall throughput as well as network coding approach.

IEMI 복사에 의한 네트워크 통신 장비의 취약성 분석 (Vulnerability Analysis of Network Communication Device by Intentional Electromagnetic Interference Radiation)

  • 서창수;허창수;이성우;진인영
    • 한국전기전자재료학회논문지
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    • 제31권1호
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    • pp.44-49
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    • 2018
  • This study analyzed the Vulnerability of Network Communication devices when IEMI is coupled with the Network System. An Ultra Wide Band Generator (180 kV, 700 MHz) was used as the IEMI source. The EUTs are the Switch Hub and Workstation, which are used to configure the network system. The network system was monitored through the LAN system configuration, to confirm a malfunction of the network device. The results of the experiment indicate that a malfunction of the network occurs as the electric field increases. The data loss rate increases proportionally with increasing radiating time. In the case of the Switch Hub, the threshold electric field value was 10 kV/m for all conditions used in this experiment. The threshold point causing malfunction was influenced only by the electric field value. The correlation between the threshold point and pulse repetition rate was not found. However, in case of the Workstation, it was found that as the pulse repetition rate increases, the equipment responds weakly and the threshold value decreases. To verify the electrical coupling of the EUT by IEMI, current sensors were used to measure the PCB line inside the EUT and network line coupling current. As a result of the measurement, it can be inferred that when the coupling current due to IEMI exceeds the threshold value, it flows through the internal equipment line, causing a malfunction and subsequent failure. The results of this study can be applied to basic data for equipment protection, and effect analysis of intentional electromagnetic interference.

Capacity Analysis of UWB Networks in Three-Dimensional Space

  • Cai, Lin X.;Cai, Lin;Shen, Xuemin;Mark, Jon W.
    • Journal of Communications and Networks
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    • 제11권3호
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    • pp.287-296
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    • 2009
  • Although asymptotic bounds of wireless network capacity have been heavily pursued, the answers to the following questions are still critical for network planning, protocol and architecture design: Given a three-dimensional (3D) network space with the number of active users randomly located in the space and using the wireless communication technology, what are the expected per-flow throughput, network capacity, and network transport capacity? In addition, how can the protocol parameters be tuned to enhance network performance? In this paper, we focus on the ultra wideband (UWB) based wireless personal area networks (WPANs) and provide answers to these questions, considering the salient features of UWB communications, i.e., low transmission/interference power level, accurate ranging capability, etc. Specifically, we demonstrate how to explore the spatial multiplexing gain of UWB networks by allowing appropriate concurrent transmissions. Given 3D space and the number of active users, we derive the expected number of concurrent transmissions, network capacity and transport capacity of the UWB network. The results reveal the main factors affecting network (transport) capacity, and how to determine the best protocol parameters, e.g., exclusive region size, in order to maximize the capacity. Extensive simulation results are given to validate the analytical results.