• Title, Summary, Keyword: Topology processing

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A Study on the Enhancement of Accuracy of Network Analysis Applications in Energy Management Systems (계통운영시스템 계통해석 프로그램 정확도 향상에 관한 연구)

  • Cho, Yoon-Sung
    • Journal of the Korean Institute of Illuminating and Electrical Installation Engineers
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    • v.29 no.12
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    • pp.88-96
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    • 2015
  • This paper describes a new method for enhancing the accuracy of network analysis applications in energy management systems. Topology processing, state estimation, power flow analysis, and contingency analysis play a key factor in the stable and reliable operation of power systems. In this respect, the aim of topology processing is to provide the electrical buses and the electrical islands with the actual state of the power system as input data. The results of topology processing is used to input of other applications. New method, which includes the topology error analysis based on inconsistency check, coherency check, bus mismatch check, and outaged device check is proposed to enhance the accuracy of network analysis. The proposed methodology is conducted by energy management systems and the Korean power systems have been utilized for the test systems.

Performance Analysis of Feature Detection Methods for Topology-Based Feature Description (토폴로지 기반 특징 기술을 위한 특징 검출 방법의 성능 분석)

  • Park, Han-Hoon;Moon, Kwang-Seok
    • Journal of the Institute of Convergence Signal Processing
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    • v.16 no.2
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    • pp.44-49
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    • 2015
  • When the scene has less texture or when camera pose largely changes, the existing texture-based feature tracking methods are not reliable. Topology-based feature description methods, which use the geometric relationship between features such as LLAH, is a good alternative. However, they require feature detection methods with high performance. As a basic study on developing an effective feature detection method for topology-based feature description, this paper aims at examining their applicability to topology-based feature description by analyzing the repeatability of several feature detection methods that are included in the OpenCV library. Experimental results show that FAST outperforms the others.

An Intra-domain Network Topologyd Discovery Algorithm (자치영역 네트워크 토플로지 작성 알고리즘)

  • Min, Gyeong-Hun;Jang, Hyeok-Su
    • The Transactions of the Korea Information Processing Society
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    • v.7 no.4
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    • pp.1193-1200
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    • 2000
  • A network topology has been an important factor for an efficient network management, but data collection for the network configuration has been done manually or semi automatically by a network administrator or an expert. Requirements to generate an intro-domain network topology ar usually either all IP addresses with subne $t^ernet mask or the network identification of all IP addresses. The amounts of traffic are generally high in the semi-automatic system due to using large number of low-level protocols and commands to get rather simple data. In this paper, we propose an algorithm which can be executed with only publicly available input. It can find all IP addresses as well as the network boundary of an intra-domain by using an intelligent method developed in this algorithm. The collected data will be used to draw a network map automatically by using a proposed network topology generation algorithm.hm.

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D-DoS Attack Prevention Using Improved 'Approximated VC' in AS Network Topology (향상된 VC 근사기법을 이용한 AS망에서의 D-DoS 공격의 효율적 차단)

  • Kim, Han-Soo;Lee, Hoon-Jae;Jang, Ju-Wook
    • Proceedings of the Korea Information Processing Society Conference
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    • pp.911-914
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    • 2003
  • The prevention of D-Dos Attack requires to install filters at As border routers. This follows that finding minimum number of filters - VC(Vertex Cover), which is NP-complete problem. So, We propose improved 'Approximate VC' which is more efficient to real AS topology using topology property. Simulation shows that our algorithm, improved 'Approximated VC' enables us to reduce 25% VC nodes in comparison with 'Approximated VC'.

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EMI Analysis of Soft Switching Inverter on High Power AC Motor Drive (대전력 교류전동기 구동용 소프트 스위칭 인버터의 EMI 해석)

  • 권순걸
    • Journal of the Institute of Convergence Signal Processing
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    • v.3 no.3
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    • pp.76-81
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    • 2002
  • In high power motor drive system, the hard-switching topology produces severs switching losses and EMI noises. Also the inverter switching frequency is thus limited because of excessive loss and thermal handling problem. The primary purpose of the proposed works on the induction motor drive system is to develop an advanced soft-switching inverter topology that is most suitable for high power induction motor drive applications. To make the optimal selection EMI comparison of the switching losses presented. To verify the proposed design procedure, detailed simulation analysis with theoretical and experimental approaches have been done using laboratory prototype.

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An Efficient Distributed Algoritm for the Weighted Shortest-path Updating Problem (최단 경로 갱신문제를 해결하는 분산알고리듬)

  • Park, Jeong-Ho;Lee, Gyeong-O;Gang, Gyu-Cheol
    • The Transactions of the Korea Information Processing Society
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    • v.7 no.6
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    • pp.1778-1784
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    • 2000
  • We consider the weighted shortest path updating problem, that is, the problem to reconstruct the weighted shortest paths in response to topology change of the network. This appear proposes a distributed algorithms that reconstructs the weighted shortest paths after several processors and links are added and deleted. its message complexity and ideal-time complexity are O(p$^2$+q+n') and O(p$^2$+q+n') respectively, where n' is the number of processors in the network after the topology change, q is the number of added links, and p is the total number of processors in he biconnected components (of the network before the topology change) including the deleted links or added links.

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Analysis of Network Performance according to Topology diameter of LAN (LAN 환경에서 Topology diameter 에 따른 네트워크 성능분석)

  • Kim, Jin-Hee;Han, Seol-Heum;Kwon, Kyung-Hee
    • Proceedings of the Korea Information Processing Society Conference
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    • pp.1569-1572
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    • 2005
  • 인트라넷은 TCP 를 지원하는 기존의 LAN 환경에서 인터넷 기술을 그대로 채택하였다. 이는 인터넷 기반의 TCP Parameter 값을 그대로 인트라넷에 적용하였음을 의미하며 서로 다른 환경에서 같은 Parameter 값의 적용은 네트워크 성능 저하의 원인이 되기도 한다. 네트워크의 성능을 확인하는 방법으로 Rtt(Round Trip Time:응답시간)와 Thput(Throughput:처리률)이 있다. 이값은 전송 거리와 트래픽 양에 따라 다르게 나타난다. 따라서 본 논문에서는 LAN 기반으로 전송거리에 따른 즉, Topology diameter 와 TCP Parameter 와의 관계를 RTT 와 Thput 을 통해 분석해 보았다.

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A Study on Application Service Delivery through Virtual Network Topology Allocation using OpenFlow based Programmable Network (OpenFlow 기반 Programmable Network에서 Virtual Network Topology 구성을 통한 응용 서비스 제공 방안 연구)

  • Shin, Young-Rok;Biao, Song;Huh, Eui-Nam
    • Proceedings of the Korea Information Processing Society Conference
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    • pp.590-593
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    • 2012
  • 현재 인터넷은 하드웨어 종속적인 특징을 가지고 있어 급변하는 환경에 적응하기 힘들다. 이러한 제약사항은 관련 산업 발전을 더디게 하고 있다. 이와 같은 네트워크 환경에서 산업 발전을 위하여 네트워크 인프라에 유연성을 제공할 수 있는 기술의 개발이 필요하다. 그러한 문제를 해결하기 위해 오픈프로토콜인 OpenFlow의 Programmable Network의 특성을 이용하여 네트워크 가상화를 구현하였으며, 응용 서비스별 Virtual Network를 제공하는 방안에 대해 연구하였다. 이를 위하여 OpenFlow 기반의 Programmable Network를 구축하였으며, 동적으로 구성이 가능한 네트워크에서 가상화를 제공하기 위해 VNAPI를 개발하였다. 또한, VNAPI를 통하여 신뢰성 있고 효율적인 응용 서비스의 전달을 위하여 Virtual Network Topology에 대한 설계를 같이 수행하였다.

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Performance Analysis of Topology for Improvement of LAN Performance in Multimedia Service Environment (멀티미디어 환경에서 LAN성능향상을 위한 토폴로지 성능분석)

  • 조병록;임성진;송재철
    • Journal of Internet Computing and Services
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    • v.2 no.5
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    • pp.93-104
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    • 2001
  • In this paper. we analyze networks in accordance with topology which consists of ATM-LAN in order to enhance performance in multimedia environment, We analyze job processing time of Email, FTP and Http server for variance of node in star, ring and mesh topology, We analyze a load factor of Email, FTP and Http server and variance of sending/receiving rate for various topology, We examined that the constituent networks in this paper can minimize load of server in any other topology.

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The Automatic Topology Construction of The Neural Network using the Fuzzy Rule (퍼지규칙을 이용한 신경회로망의 자동 구성)

  • 이현관;이정훈;엄기환
    • Journal of the Korea Institute of Information and Communication Engineering
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    • v.5 no.4
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    • pp.766-776
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    • 2001
  • In the constructing of the multi layer neural network, the network topology is often chosen arbitrarily for different applications, and the optimum topology of the network is determined by the long processing of the trial and error. In this paper, we propose the automatic topology construction using the fuzzy rule that optimizes the neurons of hidden layer, and prune the weights connecting the hidden layer and the output layer during the training process. The simulation of pattern recognition, and the experiment of the mapping of the inverted pendulum showed the effectiveness of the proposed method.

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