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2010 International Conference on Networking, Sensing and control, ICNSC 2010

作者： Shi, Bingxiong Lu, Junan Lü, Jinhu Yu, Xinghuo College of Mathematics and Statistics State Key Lab. of Software Engineering Wuhan University Wuhan 430072 China Key Laboratory of Systems and Control Institute of Systems Science Chinese Academy of Sciences Beijing 100190 China School of Electrical and Computer Engineering RMIT University Melbourne 3000 Australia School of Electrical and Computer Engineering RMIT University Melbourne VIC 3001 Australia

ISBN: (纸本)9781424464531

Recently, cluster synchronization has attracted an increasing interest in various disciplines, includingmathematics, physics, and engineering sciences. This paper further investigates the cluster synchronization of a complex dynamical network by using adaptive and impulsive control techniques, respectively. Based on a complex dynamical network with two different clusters, several adaptive and impulsive cluster synchronization criteria are then proposed. It should be especially pointed out that the dynamics and its dimensions of the individual dynamical systems are different in the two different clusters. Also, some numerical simulations are given to verify the effectiveness of the above theoretical results. ©2010 IEEE.

关键词： Dynamical systems

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Ferro-resonance over-voltage and power frequency over-voltage on the neutrals of 220kV power transformer and corresponding protection strategy

Ferro-resonance over-voltage and power frequency over-voltag...

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作者： Yu, Hua-Peng Chen, Shui-Ming Yu, Hong-Qiao Yang, Peng-Cheng Yin, Hua Wu, Gaolin State Key Lab. of Control and Simulation of Power Systems and Generation Equipments Dept. of Electrical Engineering Tsinghua University Haidian District Beijing 100084 China Chongqing Electric Power Research Institute Chongqing 401123 China

ISBN: (纸本)9781457700668

In order to limit short-circuit current and satisfy the need of relay setting, only part of the 220kV power transformer is grounded, so on the neutrals of ungrounded transformers will appear the over-voltage. Currently the value of over-voltage on transformer neutral point and the corresponding protection strategy is based on theoretical formula, this article use the PSCAD/EMTDC software to calculate the over-voltage on the neutral point of 4 ungrounded power transformers in Chongqing 220kV power grid, the result shows that the power frequency transient over-voltage on the neutrals may reach 178kV, If the single-phase grounding fault occurs in ungrounded power system, the power frequency over-voltage on the neutrals will be more serious and rise to 138.6kV. Non-full phase operation may cause serious ferro-resonance over-voltage on the neutrals of no-load transformer, which may last for seconds and may rise to 723.7kV, causing serious threat to the transformer neutrals and line-side equipment. The article also studies the gap parameter which should be taken on the neutrals of 220kV transformers at the end. © 2010 Chinese Soc for Elec Eng.

关键词： Power transformers

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key nodes and corridors identifying method for large-scale evacuation network based on information centrality

Key nodes and corridors identifying method for large-scale e...

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2010 2nd International Conference on Future Computer and Communication, ICFCC 2010

作者： Jiang, Guiyan Wu, Zhengyan Li, Qiao Zhang, Chunqin State Key Lab. of Automotive Dynamic Simulation College of Automobile Jilin University Changchun China Traffic Information Engineering and Control College of Transportation Jilin University Changchun China Department of Foreign Language and Literature College of Changcheng China University of Geosciences Baoding China

ISBN: (纸本)9781424458226

Large-scale natural or man-made disasters have the potential to cause great loss of life, human injury and extreme property damage. Evacuation from areas at risk is often one of the most feasible strategies that can be undertaken in response to these types of disasters. Evacuating a large population in the shortest possible time is an extremely complicated and difficult task, which primarily relies on efficient method of traffic planning for emergency evacuation. This paper puts forward a novel method of identifying key nodes and corridors for emergency evacuation based on information centrality, the characteristic of which integrates a method of identifying the efficient nodes and the critical connectivity nodes for evacuation, and a method of identifying the key evacuation corridors. In addition, the approach of connectivity key nodes has been proposed. The experiment results show that the proposed method has rationality and feasibility. ©2010 IEEE.

关键词： Disasters

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lab.l-based DV-Hop localization againstwormhole attacks in wireless sensor networks

Label-based DV-Hop localization againstwormhole attacks in w...

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作者： Wu, Junfeng Chen, Honglong Lou, Wei Wang, Zhibo Wang, Zhi State Key Lab. of Industrial Control Technology Zhejiang University China Dept. of Computing Hong Kong Polytechnic University Hong Kong Hong Kong Dept. of Electronic and Computer Engineering Hong Kong University of Science and Technology Hong Kong Hong Kong

ISBN: (纸本)9780769541341

Node localization becomes an important issue in the wireless sensor network as its broad applications in environment monitoring, emergency rescue and battlefield surveillance, etc. Basically, the DV-Hop localization mechanism can work well with the assistance of beacon nodes that have the capability of self-positioning. However, if the network is invaded by a wormhole attack, the attacker can tunnel the packets via the wormhole link to cause severe impacts on the DV-Hop localization process. The distance-vector propagation phase during the DVHop localization even aggravates the positioning result, compared to the localization schemes without wormhole attacks. In this paper, we analyze the impacts of wormhole attack on DV-Hop localization scheme. Based on the basic DV-Hop localization process, we propose a lab.l-based secure localization scheme to defend against the wormhole attack. Simulation results demonstrate that our proposed secure localization scheme is capable of detecting the wormhole attack and resisting its adverse impacts with a high probability. © 2010 IEEE.

关键词： Sensor nodes

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Decomposition kinetics and mechanism of alkaline hydrogen peroxide with transition metals

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Huanan Ligong Daxue Xuebao/Journal of South China University of Technology (Natural Science) 2010年第9期38卷 40-45页

作者： Zhang, Xue-Jin Li, You-Ming Lu, Rui-Jiang State Key Lab. of Pulp and Paper Engineering South China University of Technology Guangzhou 510640 Guangdong China National Engineering Research Center of Papermaking and Pollution Control South China University of Technology Guangzhou 510640 Guangdong China

Trace transition metals were introduced in the catalytic decomposition of alkali hydrogen peroxide at various pH values, and the corresponding decomposition kinetics and mechanism were investigated. The results indicate that the decomposition of hydrogen peroxide follows the quasi-first-order law in alkaline conditions, that the quasi-first-order rate constant of the alkali decomposition, kobs, increases with the pH value when 10.0 ≤ pH ≤ 11.6 but decreases when pH > 11.6, and that kobs reaches the maximum 0.0922 min-1 at 70°C and pH11.6. Moreover, the effects of pH value and reaction time on the size of transition-metal colloidal particles were also discussed, finding that the average sizes of Mn2+ and Fe3+ colloidal particles increase with the reaction time and the pH value, respectively. Thus, it is concluded that the decomposition of alkaline hydrogen peroxide is due to the catalytic decomposition of transition metal colloids and the alkaline ionization of hydrogen peroxide.

关键词： Hydrogen peroxide

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Modeling forest fire spread process based on percolation theory

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Journal of Information and Computational Science 2010年第9期7卷 1930-1937页

作者： Li, Guanghui Xia, Qibiao Li, Hong Feng, Dongqin School of Information Engineering Zhejiang A and F University Hangzhou 311300 China State Key Lab. of Industrial Control Technology Zhejiang University Hangzhou 310027 China

A forest fire spread model and its simulation algorithm based on 2D percolation lattice are presented in this paper, which can be used to simulate the forest fire spread process. The theoretical analysis and simulation experimental results show that, when the site concentration p is 0.6, the forest will approximately reach its percolation threshold. The presented model can describe the forest fire spread dynamics, and can improve the strategies for fire control and forest resource management. Moreover, the presented simulation algorithm has lower complexity than that in literature. © 2010 Binary Information Press.

关键词： Solvents

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Simulation of lightning strike in 2-D and 3-D with fractal theory and its application

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Zhongguo Dianji Gongcheng Xuebao/Proceedings of the Chinese Society of Electrical engineering 2010年第22期30卷 127-134页

作者： Xu, Wei Chen, Shui-Ming He, Jin-Liang State Key Lab. of Control and Simulation of Power Systems and Generation Equipments Dept. of Electrical Engineering Tsinghua University Haidian District Beijing 100084 China

Lighting causes great damage to power systems due to the stochastic nature of lightning discharges and the vulnerability of lightning leaders to various environments in the process of inception and propagation. In this work, the growth of diffusion limited aggregation (DLA) was adopted for reproducing branches and tortuosity of lightning channels in both 2-D and 3-D simulations. By comparing the fractal dimensions of natural lightning discharges and simulation results on various discharge settings, we discovered that a fractal coefficient η = 2 can deliver a credible model of lightning strikes. We further proved the consistency between simulation results and observations conducted in Japan during 2005 and 2006 winter seasons on lightning strikes to a windmill and its lightning-protection tower. But the credibility of the result needs to be verified by further experimental data, when the model extended from 2-D to 3-D. Moreover, striking probability and the shielding effect in the actual condition were analyzed with the proposed simulation model. © 2010 Chin. Soc. for Elec. Eng.

关键词： Fractal dimension

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Numerical simulation of electric field characteristics in response to water in-rush in working face

Numerical simulation of electric field characteristics in re...

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作者： Cheng, Jiulong Sui, Haibo Wang, Yuhe Cai, Mingfeng Jiang, Guoqing State Key Laboratory of Coal Resources and Safe Mining China University of Mining and Technology Beijing 100083 China Key Laboratory of Mine Disaster Prevention and Control Shandong University of Science and Technology Qingdao 266510 China Key Lab. for the Exploitation of Southwestern Rsrc. and the Environ. Disaster Control Engineering Ministry of Education Chongqing 400044 China CPECC East China Design Branch Qingdao 266071 China

ISBN: (纸本)9789078677383

According to the principle of resistivity detecting method and influencing law of resistivity in mining affected floor strata, different geoelectric models were constructed, such as model with water in-rush fractured zone in floor, working face advances to different distances, water in-rush after mining. Based on the "bipole-dipole" device, forward modeling was carried out by three-dimensional finite difference method. Apparent resistivity curves of different models can be obtained through numerical calculation and CT images can be obtained by processing the resistivity data with computerized tomography. Response characteristics of electric field in water in-rush working face can be analyzed by combing apparent resistivity curves with CT images. The results show that: good geological results could be achieved through numerical simulation of electric field response characteristics by using finite difference method and analyzing electric field characteristics of water in-rush in working face. This study provides theoretical basis for water in-rush detection using the resistivity method. © Atlantis Press, 2010.

关键词： Computerized tomography

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Application of Dempster-Shafer evidential theory in rock bolt testing

Application of Dempster-Shafer evidential theory in rock bol...

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作者： Sun, Xiaoyun Cheng, Jiulong Lv, Dandan Liu, Donghui School of Electrical and Electronics Engineering Shijiazhuang Tiedao University Shijiazhuang 050043 China Key Lab. for the Exploitation of Southwestern Rsrc. and the Environ. Disaster Control Engineering Ministry of Education Chongqing 400044 China State Key Laboratory of Coal Resources and Safe Mining China University of Mining and Technology Beijing 100083 China School of Electrical Engineering and Information Technology Hebei University of Science and Technology Shijiazhuang 050018 China

ISBN: (纸本)9789078677383

The basic concept and the fusion reasoning method of Dempster-Shafer evidential theory are introduced in this paper, by which the basic probability assignment testing the rock bolt is gained. The tested signal with different exciting frequencies is decomposed by HHT method, coefficients in useful signal dominative layer are used to be data fusion signal, and the Dempster-Shafer evidential theory is used to solve the rock bolt inspection problem. The result shows the effectiveness of Dempster-Shafer evidential theory method. © Atlantis Press, 2010.

关键词： Rock mechanics

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On reengineering of the approval process based on process mining

On reengineering of the approval process based on process mi...

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作者： Sun, Weihong Feng, Yixiong Lin, Dongyu State Key Lab. of Fluid Power Transmission and Control Zhejiang University Hangzhou 310027 China College of Mechanical and Electrical Engineering China Jiliang University Hangzhou 310018 China

ISBN: (纸本)9787894631046

To solve the problems of the lack of flexibility and the disjunction to the actual demand of the corporate approval process, a business approval model and a mining algorithm in workflow were proposed in this paper and a reengineering proposal of approval process based on processing mining was described. The approving staff was given the right to change the approval process flexibly. By analyzing the log record, replacing the loop structure in the workflow with virtual nodes and judging the case structure in the workflow by precursor relationship between the nodes, an improved approval process was finally reconstructed. Then, an example of manufacturing process approval was provided to prove its effectiveness and practicality.

关键词： Reengineering

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