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26th Chinese Control Conference, CCC 2007

作者： Cai, Xingjuan Cui, Zhihua Zeng, Jianchao Tan, Ying Division of System Simulation and Computer Application Taiyuan University of Science and Technology Taiyuan 030024 China State Key Laboratory for Manufacturing Systems Engineering Xi'an Jiaotong University Xi'an 710049 China

ISBN: (纸本)7900719229

As a new version of particle swarm optimization (PSO), PID-controlled PSO introduces the concept of controller into the algorithm structure. However, with the introduction of PID controller, three additional parameters are incorporated into the algorithm. Thus, how to provide a proper selection of these parameters is an important problem to affect the algorithm efficiency. In this paper, the relationships among these parameters are conducted by the stability theory. Further, a self-adaptive parameter selection strategy is proposed. simulation results show the proposed strategy is effective.

关键词： Self adjusting control systems

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A New Seamless Multi-resolution Simplification Method for the Terrain Model

A New Seamless Multi-resolution Simplification Method for th...

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Web Intelligence and Intelligent Agent Technology Workshops (WI-IAT)

作者： Huijie Zhang Jigui Sun Changsong Qi Nan Lv College of Computer Northeast Normal University Changchun China College of Computer Science & Technology Jilin University Changchun China College of Computer Science & Technology Key Laboratory of Symbol Computation and Knowledge Engineering of the Ministry of Education Jilin University China

This paper presents a fast method to construct the simplified terrain model with the multi-resolution. In this method, we adopt the normal quad-tree hierarchy to subdivide the original terrain surface into the multi- resolution levels. For the sake of implementing the compressive storage and the efficient index for the elevation data, a connotative hierarchy is proposed and its corresponding index strategies are deduced. On the basis of the connotative hierarchy, we focus on resolving the crack problem of the simplified model. We firstly create the space filling curve during the simplification process to accelerate the search for the potential cracks. Afterwards, the different approaches are utilized to process the cracks in terms of the dissimilar terrain features. For this reason, we put forward an evaluation function that can selfadaptively identify the terrain feature according to the normal vector angle of the adjacent nodes in the connotative hierarchy. Consequently, there are not redundant triangles in our seamless multi-resolution terrain model. The proposed approaches are experimented on the real data and the results show that our method is relatively efficient and robust. Besides, the seamless simplified model has less number of triangles than the other common algorithm.

关键词： Multiresolution analysis Educational institutions Intelligent agent Computer science Surface cracks Filling Conferences Acceleration Robustness Sun

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The Determinations of Pb, Cd, Hg, Cr6+, PBBs/PBDEs to Comply with RoHS Directive

The Determinations of Pb, Cd, Hg, Cr6+, PBBs/PBDEs to Comply...

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International Conference on (ICEPT) Electronic Packaging Technology

作者： L. Hua Y.P. Wu B. An Y.C. Chan B.Y. Wu F.S. Wu Wuhan National Laboratory for Optoelectronics State Key Laboratory of Plastic Forming Simulation and Die & Mould Technology Huazhong University of Science and Technology Wuhan China Department of Electronic Engineering City University of Hong Kong Kowloon Hong Kong China

For RoHS compliance, a method coupled inductively coupled plasma-optical emission spectrometry (ICP-OES), gas chromatography-mass spectrometry (GC-MS), and UV-visible spectrophotometry with microwave technology was developed to determine trace Cd, Hg, Pb, Cr 6+ , PBBs/PBDEs in electronic and electrical products (EEP). Elements were screened by Energy dispersion X-ray fluorescence spectrometry (EDXRF). In order to achieve good performance, other methods such as colorific test, inter-element correction (IEC) and standard addition techniques etc. were performed. By this study, it showed that analyses of Hg, Cd, Pb by ICP-OES and Cr 6+ by UV-visible spectrophotometry had a RSD <5%, and a RSD <1% for PBBs/PBDEs by GC-MS analyzer. UV-visible spectrophotometry offered a good alternative for Cr 6+ determination with alkali digestion, the inferences from Fe 3+ , Pb 2+ etc. were eliminated by K 2 HPO 4 buffer. The ramifications from monoBB/BDE to DecaBB/BDE were distinctly separated and successfully determined in the optimized condition. Furthermore, microwave system did an excellent job of consistently putting solid samples into solutions and had a moderate compatibility with spectrometric analyzer due to good recoveries. Though RSD of XRF screening was larger than 10%, it proved to be an easier, cheaper, faster technique. Because of the combination of multiple methodologies, the restricted substances can be determined with good precision and high reliability. It provides a prominent project for EE industries to comply with RoHS compliance.

关键词： Mercury (metals) Chromium Spectroscopy Microwave technology IEC standards Plasma displays Plasma x-ray sources Microwave theory and techniques Electrical products Fluorescence

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A Prototype of Semantic-Based Intelligent Search Engine for Chinese Documents

A Prototype of Semantic-Based Intelligent Search Engine for ...

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International Conference on Fuzzy Systems and Knowledge Discovery (FSKD)

作者： Haiyan Che Jigui Sun Tao Jing Xi Bai Key Laboratory of Symbolic Computation and Knowledge Engineering of Ministry of Education Jilin University Changchun China Jilin University College of Computer Science and Technology Jilin University Changchun China Jilin University Changchun Jilin CN

To overcome the shortcomings of traditional search engines, advocates a prototype of semantic-based search engine, called CRAB. By combining technologies of semantic Web, information extraction (IE), natural language processing (NLP) and a novel theme-based method, this framework can extract factual knowledge from Chinese natural language documents automatically. Instead of list of document links, results of user's query request returned from CRAB are semantically coherent reports generated intelligently, which can satisfy users greatly.

关键词： Prototypes Search engines Data mining Ontologies Educational institutions Computer science Educational technology Web pages Laboratories Knowledge engineering

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Text Categorization Method Based on Improved Mutual Information and Characteristic Weights Evaluation Algorithms

Text Categorization Method Based on Improved Mutual Informat...

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International Conference on Fuzzy Systems and Knowledge Discovery (FSKD)

作者： Zhili Pei Xiaohu Shi Maurizio Marchese Yanchun Liang College of Computer Science and Technology Key Laboratory of Symbol Computation and Knowledge Engineering of the Ministry of Education Jilin University Changchun China College of Mathematics & Computer Science National University of Inner Mongolia Tongliao China Department of Information and Communication Technology University of Trento Povo TN USA

The improvement of text categorization by statistical methods can be performed from two main directions, namely the feature selection and the evaluation of characteristic weights. In this paper, we propose an enhanced text categorization method based on a modified mutual information algorithm and evaluation algorithm of characteristic weights which improves both aspects. The proposed method is applied to the benchmark test set Reuters-21578 Top10 to examine its effectiveness. Numerical results show that the precision, the recall and the value of F1 of the proposed method are all superior to those of existing conventional methods.

关键词： Text categorization Mutual information Frequency shift keying Frequency estimation Computer science Statistical analysis Testing Educational institutions Communications technology Performance evaluation

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A UNIFIED A POSTERIORI ERROR ANALYSIS FOR DISCONTINUOUS GALERKIN APPROXIMATIONS OF REACTIVE TRANSPORT EQUATIONS

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Journal of computational Mathematics 2006年第3期24卷 425-434页

作者： Ji-ming Yang Yan-ping Chen Hunan Key Laboratory for Computation and Simulation in Science and Engineering Institute for Computational and Applied Mathematics and School of Mathematics and Computing Science Xiangtan University Xiangtan 4 11105 China

Four primal discontinuous Galerkin methods are applied to solve reactive transport problems, namely, Oden-BabuSka-Baumann DG （OBB-DG）, non-symmetric interior penalty Galerkin （NIPG）, symmetric interior penalty Galerkin （SIPG）, and incomplete interior penalty Galerkin （IIPG）. A unified a posteriori residual-type error estimation is derived explicitly for these methods. From the computed solution and given data, explicit estimators can be computed efficiently and directly, which can be used as error indicators for adaptation. Unlike in the reference [10], we obtain the error estimators in L^2 （L^2） norm by using duality techniques instead of in L^2（H^1） norm.

关键词： A posteriori error estimates Duality techniques Discontinuous Galerkin methods

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OPTIMAL ERROR ESTIMATES OF THE PARTITION OF UNITY METHOD WITH LOCAL POLYNOMIAL APPROXIMATION SPACES

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Journal of computational Mathematics 2006年第3期24卷 365-372页

作者： Yun-qing Huang Wei Li Fang Su Hunan Key Laboratory for Computation and Simulation in Science and Engineering Institute for Computational and Applied Mathematics Xiangtan University Xiangtan 4 11105 China Department of Computational Science Xiangtan University Xiangtan 4 11105 China

In this paper, we provide a theoretical method（PUFEM）, which belongs to the analysis of the partition of unity finite element family of meshfree methods. The usual error analysis only shows the order of error estimate to the same as the local approximations[12]. Using standard linear finite element base functions as partition of unity and polynomials as local approximation space, in l-d case, we derive optimal order error estimates for PUFEM interpolants. Our analysis show that the error estimate is of one order higher than the local approximations. The interpolation error estimates yield optimal error estimates for PUFEM solutions of elliptic boundary value problems.

关键词： Meshless methods Partition of unity finite element method（PUFEM） Error estimate.

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PRECONDITIONING HIGHER ORDER FINITE ELEMENT SYSTEMS BY ALGEBRAIC MULTIGRID METHOD OF LINEAR ELEMENTS

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Journal of computational Mathematics 2006年第5期24卷 657-664页

作者： Yun-qing Huang Shi Shu Xi-jun Yu Hunan Key Laboratory for Computation and Simulation in Science and Engineering Institute for Computational and Applied Mathematics Xiangtan University Xiangtan 411105 China Laboratory of Computational Physics Institute of Applied physics and Computational Mathematics Beijing 100088 China

We present and analyze a robust preconditioned conjugate gradient method for the higher order Lagrangian finite element systems of a class of elliptic problems. An auxiliary linear element stiffness matrix is chosen to be the preconditioner for higher order finite elements. Then an algebraic multigrid method of linear finite element is applied for solving the preconditioner. The optimal condition number which is independent of the mesh size is obtained. Numerical experiments confirm the efficiency of the algorithm.

关键词： Finite element Algebraic multigrid methods Preconditioned Conjugate Gradient Condition number.

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A NEW MIXED-INTEGRATED APPROACH TO CONTROL WELDED FLASHES FORMING PROCESS OF DAMPINGTUBE-GLAND IN CONTINUOUS DRIVE FRICTION WELDING

A NEW MIXED-INTEGRATED APPROACH TO CONTROL WELDED FLASHES FO...

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INternational Conference on Product Design and Manufacturing Systems(2007年产品设计与制造系统国际会议)

作者： J.LUO K.W.LIU J.J.XU J.Y.LUO Y.H.YE College of Mechanical Engineering Chongqing UniversityChongqing 400044P.R.China Department of Material Science and Engineering Wuhan University of TechnologyWuhan 430070P.R.China State Key Laboratory of Plastic Forming Simulation and Die & Mould Technology Wuhan 430074P.R.China College of Mechanical EngineeringChongqing UniversityChongqing 400044P.R.China Department of Material Science and EngineeringWuhan University of TechnologyWuhan 430070P.R.China

The continuousdrive friction welding technique is usually used to join damping-tube and ***,the inner friction welding flashes at the end of damping-tube are very harmful to the assembly of damping device and the cleanness of damping liquid,and reduce the safety coefficient of the *** is very difficult to deal with these inner friction welding flashes of the damping-tube,especially the diameter of the damping-tube is *** address this problem,in this article,we propose a mixed-integrated approach,which includes adjusting the size of the covering of damping-tube,designing a new structure for the tube,applying a controlling mould,and optimizing the parameters of the welding *** approach reduces the sum of the inner welding flashes,controls the crimping direction of the friction welding flashes,and promotes the forming of the outer friction welding *** results show that proposed mixed-integrated approach eliminates the problems of the inner friction welding flashes.

关键词： Continuous drive friction welding Welding flashes Optimizing the parameters

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simulation and control strategy for the variational influent of WWTP

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Journal of Environmental sciences 2006年第1期18卷 62-68页

作者： LIU Yan-chen FAN Long SHI Han-chang WANG Zhi-qiang State Key Joint Laboratory of Environment Simulation and Pollution Control Department of Environmental Science and Engineering TsinghuaUniversity Beijing 100084 China

With the development of activated sludge model, the simulation software for the design and operation of wastewater treatment plant （WWTP） was produced and has been widely used. The dynamic change of the quality and flow of influent are major factors causing the unstable operation of wastewater treatment process. As a basic model, ASMI model was used for the simulation of activated sludge process, and double exponential model was selected for the simulation of secondary sedimentation tank. The influences of influent change to the aeration tank and secondary sedimentation tank were investigated, and the relationship among influent change, the quality of effluent and the level of sludge blanket in secondary sedimentation tank was established. On the basis of the simulation results, the operation of the WWTP could be adjusted under the dynamic change of the influent. Furthermore, the controlling strategy combined the feed-forward on the influent flow and the feedback on the level of sludge blanket in the secondary sedimentation tank was studied.

关键词： modeling dynamic simulation static simulation controlling strategy influent

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