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22nd International Conference on Database and Expert Systems Applications, DEXA 2011

作者： Xavier Jr., João C. Signoretti, Alberto Canuto, Anne M. P. Campos, Andre M. Gonçalves, Luiz M. G. Fialho, Sergio V. Computing and Automation Engineering Department UFRN Natal Brazil Computer Science Department UERN Natal Brazil Informatics and Applied Mathematics Department UFRN Natal Brazil

ISBN: (纸本)9783642230905

This paper proposes the use of a multi-agent system (MAS) with affective agents in a recommendation system based on relational data clustering. This MAS works as a mediator between the user and the data stored in the system. In the proposed system, after logging in, each user will have an affective agent, called Interface agent, for interaction purposes. This agent models the user's data requests according to the user's profile and its affective status, sending it to the Recommender agent, which recommends a set of map points to be visualized. The system analyzes the user's feedback in order to verify whether the recommended information was satisfactory. This feedback is analyzed through the monitoring of the interaction interface.. © 2011 Springer-Verlag Berlin Heidelberg.

关键词： Recommender systems

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Supercapacitors in power converter DC link: A short overview of design and application issues

Supercapacitors in power converter DC link: A short overview...

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作者： Čihak, E. E. Tihomir Jakopović, E. E. Željko KONAR - Electrical Engineering Institute Power Electronics and Control Department Zagreb Croatia Faculty of Electrical Engineering and Computing Department of Electric Machines Drives and Automation Zagreb Croatia

ISBN: (纸本)9789532330670

Very high values of efficiency in electric power conversion, electric energy saving requirements and power converter component optimization are priorities in design and construction of any type of modern power electronic converters. Moreover, if such power converters are connected to battery power source or other weak power source (as, for instance, fuel cells), additional design problems appear in sense of (battery) power source longevity, absorption of high peak power transients, provision of on-demand power bursts for load and other. EDLC, well known by their commercial name as Supercapacitors, are one of the possible solutions for aforementioned problems. © 2011 MIPRO.

关键词： Supercapacitor

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Dissipative control for linear systems via PID controller

Dissipative control for linear systems via PID controller

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作者： Wang, Shuping Zhang, Guoshan Zuo, Zhiqiang Liu, Wanquan School of Electrical Engineering and Automation Tianjin University Tianjin 300072 China Department of Computing Curtin University WA 6102 Australia

ISBN: (纸本)9789881725592

In this paper a new type of proportional-integral-derivative (PID) controllers is designed to make the closed-loop linear system asymptotically stable and strictly quadratic dissipative. First, we give a state-space realization for such PID controller and then derive the state-space realization of closed-loop system. Second, a necessary and sufficient condition ensuring the closed-loop system to be asymptotically stable and quadratic dissipative is derived in terms of linear matrix inequality (LMI). Based on this result, the explicit expression for the PID controller gains is presented. Finally, an illustrative example is given to demonstrate the effectiveness of the proposed design approach. © 2011 Chinese Assoc of automation.

关键词： Linear systems

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Global robust output regulation for a class of multivariable systems and its application to a motor drive system

Global robust output regulation for a class of multivariable...

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作者： Ping, Zhaowu Huang, Jie Applied Control and Computing Laboratory Department of Mechanical and Automation Engineering Chinese University of Hong Kong Shatin N. T. Hong Kong

ISBN: (纸本)9781457700804

In this paper, we study the global robust output regulation problem for a class of multivariable nonlinear systems. The problem is first converted into a stabilization problem of an augmented system composed of the original plant and an internal model. The augmented system is a two-input system containing both dynamic uncertainty and time-varying static uncertainty. By decomposing the two-input control problem into two single-input control problems, we can solve the problem via a recursive approach utilizing the changing supply function technique. Finally, the theoretical result is applied to the speed tracking control and load torque disturbance rejection problem of a surface-mounted PM synchronous motor. © 2011 AACC American Automatic Control Council.

关键词： Disturbance rejection

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Influence of Temperature Probes Installation on the Salient Pole to Temperature Measurement

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Journal of Energy and Power engineering 2011年第8期5卷 776-784页

作者： Z. Hanic M. Kovacic M. Vrazic Department of Electrical Machines and Automation Faculty of Electrical Engineering and Computing University of Zagreb Zagreb 10000 Croatia

Accurate and reliable information about the temperature of the synchronous generators excitation winding hot spot is necessary to determine the dynamic limit caused by excitation winding overheating in the PQ diagram. For good estimation of a position and the hot spot temperature it is decided to mount 19 temperature probes on one pole of the 6-pole, 400 kVA. 50 llz synchronous generator. Due to a large number of the probes and because the probes should be glued with the metal epoxy it was assumed that mounting of the probes will disrupt the temperature field of the excitation winding. To get the answer to this question the excitation winding resistance was measured betbre and after mounting the probes, in a hot and a cold state. Temperature rise can be estimated if the resistance ratio in the hot and the cold state is known. The paper also addresses the analysis of the measurement accuracy. The result shows that, there is no significant influence on the temperature when mounting the 19 temperature probes which covered 10% of the pole excitation winding surface.

关键词： Temperature measurement AC generators rotating machine measurements excitation winding thermal probes digital measurements measurement accuracy measurement errors.

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On improving the generalization of SVM classifier

On improving the generalization of SVM classifier

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5th International Conference on Information Processing, ICIP 2011

作者： Seetha, H. Narasimha Murty, M. Saravanan, R. School of Computing Science and Engineering VIT University Vellore-632014 India Department of Computer Science and Automation Indian Institute of Science Bangalore India School of Information Technology and Engineering VIT University Vellore-632014 India

ISBN: (纸本)9783642227851

The generalization performance of the SVM classifier depends mainly on the VC dimension and the dimensionality of the data. By reducing the VC dimension of the SVM classifier, its generalization performance is expected to increase. In the present paper, we argue that the VC dimension of SVM classifier can be reduced by applying bootstrapping and dimensionality reduction techniques. Experimental results showed that bootstrapping the original data and bootstrapping the projected (dimensionally reduced) data improved the performance of the SVM classifier. © Springer-Verlag 2011.

关键词： Classification (of information)

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Robust fault-tolerant tracking control for a near-space vehicle using a sliding mode approach

Robust fault-tolerant tracking control for a near-space vehi...

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作者： Jiang, B. Xu, Y. Shi, P. Gao, Z. College of Automation Engineering Nanjing University of Aeronautics and Astronautics Nanjing 210016 China Department of Computing and Mathematical Sciences University of Glamorgan Pontypridd United Kingdom School of Engineering and Science Victoria University Melbourne VIC Australia

In this study, a flight fault-tolerant control scheme based on an adaptive sliding mode technique is proposed. First, a control allocation of a near-space vehicle (NSV) attitude dynamics is analysed, and actuator fault modelling is introduced. Then, a modified sliding model tracking control approach, using a continuous strategy of integral sliding mode control, is designed to improve the position tracking precision. This scheme can solve the chattering problem without loss of robustness and control accuracy. Actuator fault and unmeasurable external disturbances are compensated for by an integral action term. To verify the effectiveness of the proposed control scheme, a numerical simulation is performed for an NSV attitude system, which is a non-linear aircraft model with six degrees of freedom. Simulation results demonstrate that the closed-loop system has good performance in spite of the actuator fault and system disturbances. © 2011 Author.

关键词： Degrees of freedom (mechanics)

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Modeling and PostGIS implementation of the basic planar imprecise geometrical objects and relations

Modeling and PostGIS implementation of the basic planar impr...

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9th International Symposium on Intelligent Systems and Informatics, SISY 2011

作者： Obradović, D. Konjović, Z. Pap, E. Rudas, I.J. Faculty of Technical Sciences Department of Computing and Automation Novi Sad Serbia Faculty of Sciences Department of Mathematics and Informatics Novi Sad Serbia Obuda University Institute of Intelligent Engineering Systems H-1034 Budapest Hungary

ISBN: (纸本)9781457719745

In this paper it is introduced a new mathematical model of basic planar imprecise geometric objects: fuzzy line, fuzzy triangle and fuzzy circle, as well as basic spatial relations: coincidence, between and collinear. Models are implemented as an extension of the PostGIS spatial data managing system in Pl/ PgSQL language. © 2011 IEEE.

关键词： Computational modeling Data models Geometry Informatics Intelligent systems Mathematical model Pl/ PgSQL language PostGIS spatial data managing system SQL Spatial databases fuzzy circle fuzzy line fuzzy set theory fuzzy triangle geographic information systems geometry planar imprecise geometric objects spatial relations visual databases

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Global Robust Output Regulation of Nonlinear Systems subject to a Nonlinear Exosystem

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IFAC Proceedings Volumes 2011年第1期44卷 1368-1373页

作者： X. Yang J. Huang Applied Control and Computing Laboratory Department of Mechanical and Automation Engineering The Chinese University of Hong Kong Hong Kong

Abstract The global robust output regulation problem for nonlinear plants subject to nonlinear exosystems has been a challenging problem and has not been well addressed. The main difficulty lies in finding a suitable internal model. In this paper, we first propose a new class of internal models which is guaranteed to exist under the generalized immersion condition [2]. An advantage of this internal model is that it is zero input globally asymptotically stable. This fact will facilitate the global stabilization of the augmented system associated with the given plant and the internal model. Then we will further utilize this class of internal models to solve the global robust output regulation problem for output feedback systems with a nonlinear exosystem.

关键词： Output regulation Nonlinear exoystem Internal model design

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Crane scheduling of steel-making and continuous casting process using the Mixed-timed Petri net modelling via CPLEX optimization

Crane scheduling of steel-making and continuous casting proc...

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作者： Sun, Liangliang Liu, Wei Chai, Tianyou Wang, Hong Zheng, Binglin State Key Laboratory of Integrated Automation for Process Industry Northeastern Universit Shenyang 110004 China Manufacturing Computing Lab. Electrical Engineering Department University of Connecticut Storrs CT United States

ISBN: (纸本)9783902661937

The key issues for iron and steel production in terms of improved productivity are to realize a good crane scheduling for a well-organized rhythm of the whole production and to improve the transportation efficiency of cranes in a computational manner to assist the main equipment scheduling. In this paper a Mixed-timed Petri net modeling is introduced to minimize the makespan of the whole steelmaking and continuous casting process. The crane scheduling problem is formulated as the optimization of firing transition sequences based on the Mixed-timed Petri net (i.e., the Petri net that includes time-transitions and zero-time transitions). Then the formulation is converted to a linear model that can be solved using the branch-and-cut method in the standard commercial solver CPLEX. Special methods for the linear conversion are developed. Due to the limited calculation time required for the scheduling and the scale of the problem, special methods for the efficiency tuning are applied according to the characteristics of the problem. Numerical testing supported by Shanghai Bashan steel plant has demonstrated a significant improvement over the traditional manual scheduling results, showing an improved effectiveness in terms of assisting the on-site schedulers to obtain a better strategy for steelmaking and continues casting. © 2011 IFAC.

关键词： Steelmaking

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