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research on Network Self-protection System Model and Its Security Event Correlation Engine

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Research on Network Self-protection System Model and Its Sec...

2010 International Conference on Services science, Management and Engineering (SSME 2010)

作者： Hongyu Yang School of Computer science and technology Civil Aviation university of china Tianjin 300300 china Dongming Wang School of Computer science and technology Civil Aviation university of china Tianjin 300300 china Chuangxi Chen dep.of ground maintenance china Southern Airlines Co.Ltd. Guangzhou 510406 china

Manual analysis of security events inevitably results in a large number of attacks can not being detected timely This paper presents a new network self-protection system model,gives its architecture and designs its information security event correlative analysis *** the correlation engine,the expectation maximization（EM） algorithm was designed to solve the problem by lack of security *** the bucket elimination algorithm was used to enhance the computational efficiency of Bayesian *** experimental results demonstrate that the reasoning speed of the correlation engine fulfills the need of network protection against unknown attacks.

关键词： self-protection correlation engine Bayesian network bucket elimination algorithm Expectation maximization algorithm

research on System of performance Diagnosis through Mathematical Simulation in Ball Games——For Example of Table Tennis

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Research on System of Performance Diagnosis through Mathemat...

第4届全国青年体育科学学术会议

作者： ZHANG Hui science research dep., Shanghai university of Sport, Shanghai, 200438, china

＜正＞Introduction:The concept of performance diagnosis through mathematical simulation by means of the Markov chain model was put forward by Lames （1988）. Illustrating with the instance of table tennis match, this ...

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predict acoustic field of vibrating beams by Helmholtz integral equation and BEM

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Chinese Journal of Acoustics 1993年第2期12卷 117-126页

作者： YU Xingzhuo, HU Guoshen and ZHOU Yu(dep. of Mech. Engineering (I) Huazhong university of science & technology , Wuhan 430074)

New method of predicting the acoustic field radiation of vibrating bodies is presented. It is based on the Helmholtz integral equation and boundary element method and applicable to the use of computers. The acoustic field of the cantilever beams has been calculated and measured. Test results have proved the effectiveness of the predicting method.

关键词： Vibrating Acoustic field Boundary element.

THE rESEArCH OF MIXED prODUCT LINES OF MATErIAL DELIVErING SYSTEM DrAWN BY OrDErS

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THE RESEARCH OF MIXED PRODUCT LINES OF MATERIAL DELIVERING S...

2005年中国机械工程学会年会

作者： HOU Kaihu, YU Kaichao, ZHANG Yu (dep. of Industry and Engineering, Faculty of mechanical and Electrical Engineering, Kunming university of science and technology, Kunming, 650093, china)

＜正＞To deal with mode of production small lot size and more varieties, the system of mixed production lines of material delivering system drawn by order was discussed. Firstly, the model of mixed production lines of material delivering system drawn by orders was build. Secondly, the logic of processing of the model was studied. To realize delivering components to production line in JIT＆pDT, three disposing ways were presented. Thirdly, Disposing flow of this system models were analyzed. Finally, The physical structure and function of the system was put forward.

关键词： delivering material system mixed product lines information technology

TEMpOrAL EIGENVALUE SpECTrA OF BOUNDArY-LAYEr FLOW OVEr rIGID WALL AND COMpLIANT WALL

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Journal of Hydrodynamics 2001年第1期13卷 70-74页

作者： Zhao, H.Z. Yeo, K.S. dep. of Mechanics Huazhong Univ. of Sci. and Technol. Wuhan 430074 China

The temporal eigenvalue spectra of the equation system for the boundary-layer flows over both rigid wall compliant and viscoelastic compliant wall are numerically studied. In a rigid-wall case only the fluid-based eigenmodes, the Tollmien-Schlichting instability (TSI) mode, exist. In a compliant-wall case, both the TSI and wall-based compliance-induced instability flow instability (CIFI) modes occur. The variations of the two categories of eigenvalues at various wall material stiffness and damping are also displayed.

关键词： Computer simulation Eigenvalues and eigenfunctions Stability

TpC-BASED STBC MULTIUSEr DETECTION WITH LSE-rLS ALGOrITHM

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Journal of Electronics(china) 2006年第1期23卷 23-25页

作者： Du Yinggang Chan Kam Tai dep of Electronic Engineering The Chinese University of Hong Kong Shatin N. To Hong Kong China dep of Electronic Engineering Nanjing University of Science and Technology Nanjing 210094 China

The Bit Error rate （BEr） performance of a Turbo product Code （TpC） based Space-Time Block Coding （STBC） multiuser wireless system in the frequency-selective channels has been investigated. Both of the good error correcting capability of TpC and the large diversity gain of STBC can be achieved simultaneously. A Least Square Error-recursive Least Square （LSE-rLS） algorithm is applied to estimate the channel and cancel the interference. Simulations show that the proposed system can obtain about 2.7dB gain in Es/N0 at the BEr of 10^-3.

关键词： Turbo product Code (TpC) Space-Time Block Coding (STBC) Multiuser Least Square Error(LSE) recursive Least Square (rLS)

A Novel Method for Identifying Large Steam Turbine-Generator parameters by Load rejection Test

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A Novel Method for Identifying Large Steam Turbine-Generator...

2005国际电机与系统学术会议

作者： Kang Erliang Sun Li Li Bo Yu Changsheng dept. of Electrical Engineering Harbin Institute of technology Harbin 150001 china dep. of Electrical and Electronics Engineering Harbin university of science and technology Harbin 150040 china

＜正＞This paper employs a novel method, which is first decomposing the load rejection model and then deriving optimal combination models from the characteristics of the decaying speeds of the subtransient component and transient component of one phase voltage, to directly identify the transient parameters in different regions employing nonlinear least squares regression theory respectively. Employing the load-rejection model constructed with the design values of turbo-generator QFSN-600-2YH to calculate the quantities by the different methods indicates that the parameters-identified errors of applying the optimal models are far less than the errors of directly estimating all the parameters from the model. By the models one can obtain the direct parameters and quadrature parameters through load rejections under special reference, i.e. direct axis and arbitrary reference. The direct parameters of a 600MW turbine generator made by Harbin Large Electric Machine Flant china are determined by the method.

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STABILIZATION OF A CLASS OF NONLINEAr TIME-VArYING UNCErTAIN SYSTEMS WITH MULTIpLICATIVE UNMODELLED DYNAMICS

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STABILIZATION OF A CLASS OF NONLINEAR TIME-VARYING UNCERTAIN...

第二十届中国控制会议

作者： Yi-Sheng Zhong (CVSrKIz) dep. of Automation, Tsinghua university, Beijing, p.r. china

＜正＞robust stabilizing problem is dealt with for nonlinear time-varying uncertain systems with multiplicative unmodelled dynamics. A new method will be proposed to design a linear time-invariant robust controller. An artificial nominal plant is introduced and the real plant is regarded as the nominal one plus nonlinear time-varying uncertainties and multiplicative unmodelled dynamics. A nominal controller is first designed to stabilize the nominal plant, then a robust compensator is designed to restrain the influence of the real plant perturbations from the nominal one. Under certain assumptions, robust stability can be guaranteed by applying a robust compensator with sufficiently wide frequency bandwidth. A feature of the presented method is that it can tell us how to perform on-line tuning for the controller parameter.

关键词： robust control stability uncertain nonlinear time-varying systems multiplicative unmodelled dynamics

robust tracking control for a class of nonlinear time-varying uncertain systems with unmodelled dynamics

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Robust tracking control for a class of nonlinear time-varyin...

第二十一届中国控制会议

作者： ZHONG Yi-sheng (dep. of Automation, Tsinghua university, Beijing, p. r. china)

＜正＞robust tracking problem is dealt with for nonlinear time-varying uncertain systems with unmodelled dynamics. A new method will be proposed to design a linear time-invariant robust controller. An artificial nominal plant is introduced and the real plant is regarded as the nominal one plus nonlinear time-varying uncertainties and unmodelled dynamics. A nominal controller is first designed for the nominal plant, then a robust compensator is designed to restrain the influence of the real plant perturbations from the nominal one. Under certain assumptions, robust stability and output tracking can be achieved by applying a robust compensator with a suffciently wide frequency bandwidth. A feature of the proposed method is that it can tell us how to perform on-line tuning for the controller parameter.

关键词： robust control output tracking uncertain nonlinear time-varying systems