• 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.

Topology Optimization of Reinforcement Pattern for Pressure-Explosion Proof Enclosure Door in Semiconductor Manufacturing Process (위상최적화 기법을 이용한 반도체 공정용 압력방폭형 외함 도어의 보강 패턴 최적화)

  • Yeong Sang Kim;Dong Seok Shin;Euy Sik Jeon
    • Journal of the Semiconductor & Display Technology
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    • v.22 no.2
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    • pp.56-63
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    • 2023
  • This paper presents a method using finite element analysis and topology optimization to address the issue of overdesign in pressure-explosion proof enclosure doors for semiconductor manufacturing processes. The design conducted in this paper focuses on the pattern design of the enclosure door and its fixation components. The process consists of a solid-filled model, a topology optimization model, and a post-processing model. By applying environmental conditions to each model and comparing the maximum displacement, maximum equivalent stress, and weight values, it was confirmed that a reduction of about 13% in weight is achievable.

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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.

Utility-Interactive Modulated Sinewave Inverter with a High Frequency Flyback Transformer Link for Small-Scale Solar Photovoltaic Generator

  • Konishi Y.;Chandhaket S.;Ogura K.;Nakaoka M.
    • Proceedings of the KIPE Conference
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    • 2001.10a
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    • pp.683-686
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    • 2001
  • This paper presents a novel prototype of the utility­interactive voltage source type sinewave pulse modulated power inverter using a high-frequency flyback transformer link. The proposed power conditioner circuit for the solar photovoltaic generation and small scale fuel cell has an isolation function due to the safety of the power processing system, which is more cost effective and acceptable for the small-scale distributed renewal energy conditioning and processing systems. The discontinuous current mode(DCM) of this power processing conversion circuit is applied to implement a simple circuit topology and pulse modulated control scheme. Its operation principle is described on the basis of simulation evaluations and theoretical considerations. The simulation results obtained herein prove that the proposed inverter outputs with sinusoidal waveforms and unity power factor currents are synchronized to the main voltage in utility power source grid. In this paper, the soft switching topology of high­frequency linked sinewave pulse modulation inverter is proposed and discussed.

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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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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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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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    • 2003.11b
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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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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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    • 2005.05a
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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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