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3rd International Workshop on Software Aging and Rejuvenation, WoSAR 2011

作者： Ning, Gaorong Trivedi, Kishor S. Hu, Hai Cai, Kai-Yuan Department of Automatic Control Beijing University of Aeronautics and Astronautics Beijing 100191 China Department of Electrical and Computer Engineering Duke University Durham NC 27708-0294 United States

ISBN: (纸本)9780769546162

In this paper, a multi-granularity software rejuvenation policy isstudied. Four granularities of rejuvenation are proposed tomitigate the impact of four levels of software aging *** Time Markov Chain (CTMC) model is used to obtain theavailability and cost from its closed form solution. Moreover, therelations between availability, cost and parameters are studied and the optimal selection of parameters is obtained accordingly. Numerical examples show that the optimal inspection rates for maximizing availability and minimizing cost become larger if inspection delay rate becomes lower, and also the optimal inspection rates have the property of phase transitions when inspection delay rate changes. © 2011 IEEE.

关键词： Inspection

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Applications of QFT robust control techniques to marine systems

Applications of QFT robust control techniques to marine syst...

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9th IEEE International Conference on control and Automation, ICCA 2011

作者： Muñoz-Mansilla, R. Aranda, J. Díaz, J.M. Chaos, D. Reinoso, A.J. Automatic Control and Computer Engineering Department National Distance University of Spain Madrid 28040 Spain GSyC/Libresoft Department Rey Juan Carlos University Madrid 28933 Spain

ISBN: (纸本)9781457714757

In this work an overview of the application of the Quantitative Feedback Theory (QFT) technique to different marine systems is presented. Namely the problems of the stabilization of a high-speed craft, the dynamic positioning of a moored platform and the tracking control of a hovercraft are studied. An interesting question is that the plants have less degree of freedom for actuation and is more difficult to control. The three multivariable nonlinear problems are tackled by different procedures. Performance evaluation analyses and simulations in different conditions are carried out. It is shown that robust techniques based on QFT methodology result feasible and very suitable;and therefore they constitute attractive alternatives in the application of stabilization, dynamic positioning and tracking control of advanced marine systems. © 2011 IEEE.

关键词： Stabilization

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Eclectic Genetic Algorithm for holistic face recognition in L∞ space

Eclectic Genetic Algorithm for holistic face recognition in ...

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World Congress on engineering 2011, WCE 2011

作者： Villegas, C. Climent, J. Murillo, C.R. Otero, A. Villegas, C.R. Universidad Iberoamericana Systems Engineering Department México D.F. Mexico Universitat Politecnica de Catalunya Automatic Control Departament Barcelona Spain Biomedical Engineering Department Universidad Iberoamericana Spain

ISBN: (纸本)9789881925145

Several works regarding facial recognition have dealt with methods which identify isolated characteristics of the face or with templates which encompass several regions of it. In this paper a new technique which approaches the problem holistically dispensing with the need to identify geometrical characteristics or regions of the face is introduced. The characterization of a face is achieved by randomly sampling selected attributes of the pixels of its image. From this information we construct a set of data, which correspond to the values of low frequencies, gradient, entropy and another several characteristics of pixel of the image. Generating a set of "p" variables. The multivariate data set with different polynomials minimizing the data fitness error in the minimax sense (L∞ - Norm) is approximated. With the use of a Genetic Algorithm (GA) it is able to circumvent the problem of dimensionality inherent to higher degree polynomial approximations. The GA yields the degree and values of a set of coefficients of the polynomials approximating of the image of a face. By finding a family of characteristic polynomials from several variables (pixel characteristics) for each face (say Fi ) in the data base through a resampling process the system in use, is trained. A face (say F ) is recognized by finding its characteristic polynomials and using an Classifier from F 's polynomials to each of the Fi 's polynomials. The winner is the polynomial family closer to F 's corresponding to target face in data base.

关键词： Genetic algorithms

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Robust Hinfin filtering for uncertain 2-D continuous systems, based on a polynomially parameter-dependent Lyapunov function

Robust Hinfin filtering for uncertain 2-D continuous systems...

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2011 7th International Workshop on Multidimensional (nD) systems, nDS 2011

作者： El-Kasri, Chakir Hmamed, Abdelaziz Alvarez, Teresa Tadeo, Fernando Department of Physics Faculty of Sciences University of Dhar El Mehraz BP 1796 Fes-Atlas Morocco Department of Systems Engineering and Automatic Control University of Valladolid 47005 Valladolid Spain

ISBN: (纸本)9781612848167

The problem of robust Hinfin filtering for uncertain two-dimensional (2-D) continuous systems described by the Roesser state-space model is investigated when the parameter uncertainties are polytopic. A sufficient linear matrix inequality (LMI) condition for the existence of a 2-D continuous filter such that, for all admissible uncertainties, the error system is asymptotically stable, and the Hinfin norm of the transfer function from the noise signal to the estimation error is below a prespecified level. A sequence of standard LMI conditions that ensure the existence of homogeneous polynomially parameter-dependent (HPPD) matrices of arbitrary degree, that are solutions to the parameter-dependent LMIs is provided in terms of the vertices of the polytope. The proposed method includes results in the quadratic framework and the linearly parameter-dependent framework as special cases. Finally, an example is provided to demonstrate the effectiveness and advantages of the proposed filter design methodology. © 2011 IEEE.

关键词： Linear matrix inequalities

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Studying robot-environment interaction via transparent controllers

Studying robot-environment interaction via transparent contr...

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International Conference on Advanced Robotics (ICAR)

作者： O. Akanyeti P. Fiorini S. A. Billings Department of Computer Science University of Verona Italy Department of Automatic Control and Systems Engineering University of Sheffield UK

In this paper we address the question of “Why is it that a mobile robot, programmed in a certain way and placed in some environment to execute a program, behaves in the way it does?”. We present three real world experiments in which we first obtain transparent controllers to express sensor-motor couplings of a mobile robot. We then use these models to analyze the robot behaviour formally; in particular to understand how the sensor readings are related to motor commands, to evaluate the derived controllers from a mathematical point of view and even to predict the behaviour of the robot in untested environments.

关键词： Robot sensing systems Polynomials Lasers Analytical models Training Humans

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Multi-objective PSO based augmented control of a twin rotor system

Multi-objective PSO based augmented control of a twin rotor ...

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IEEE International Conference on Mechatronics

作者： Toha, S.F. Tokhi, M.O. Department of Mechatronics Faculty of Engineering International Islamic University Malaysia P.O. Box 10 50728 Kuala Lumpur Malaysia Department of Automatic Control and Systems Engineering University of Sheffield United Kingdom

ISBN: (纸本)9781612844350

control of vibration suppressions is crucial for applications in engineering particularly in the area of aircraft system. An augmented control approach encompasses of using a feedforward intelligent command shaping technique with combination of intelligent PID feedback control is presented in this paper. The advantage of using command shaping is to reduce system vibration. However, it can cause delay in system response resulting to a conflict between vibration suppression and rise time response. Multi-objective particle swarm optimization with spread factor (MOPSO-SF) is employ in this paper to determine a set of solutions for the amplitudes and corresponding time locations of impulses on an extra sensitive (El) command shaping as well as gain parameters for the PID controller. The effectiveness of the proposed technique is assessed both in the time domain and the frequency domain. Moreover, a comparative assessment of the performance of the technique with the system response and unshaped finite step input is presented. © 2011 IEEE.

关键词： Particle swarm optimization (PSO)

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Integrated Approach to Hypersonic Vehicle Modeling

Integrated Approach to Hypersonic Vehicle Modeling

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Chinese control Conference

作者： Xiaofeng Su Yingmin Jia Junping Du Fashan Yu The Seventh Research Division and the Department of Systems and Control Beihang University (BUAA) Key Laboratory of Mathematics Informatics and Behavioral Semantics (LMIB) Ministry of Education SMSS Beihang University (BUAA) Beijing Key Laboratory of Intelligent Telecommunications Software and Multimedia School of Computer Science and Technology Beijing University of Posts and Telecommunications School of Electrical Engineering and Automation Henan Polytechnic University

ISBN: (纸本)9781467325813

This paper is devoted to the modeling problem of hypersonic vehicle with significant couplings. An integrated approach is developed to analytically model the dynamics of hypersonic vehicle, in which the effects of variable mass, spherical rotating earth, and couplings among the sub-models are considered. Furthermore, a preliminary analysis is conducted using the general data of a hypersonic vehicle. The simulation results show that the maximum of the Coriolis force can reach values up to 7.02% of the vehicle weight, and that the thermal load determined by the nonuniform aerodynamic heating and the properties of the structure has a significant influence on the elastic deformation.

关键词： Hypersonic vehicle modeling Inertial dynamics Aerodynamics Elasticity Heating hypersonic vehicles Aerodynamics elasticity Coriolis force Vehicle weight Heating Couplings Thermal loading elastic deformation

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Power flow optimization using positive quadratic programming *

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IFAC Proceedings Volumes 2011年第1期44卷 10481-10486页

作者： Javad Lavei Anders Rantzer Stephen Low Department of Control and Dynamical Systems Caltech Automatic Control LTH Lund University Sweden Steven H. Low is with the Computer Science and Electrical Engineering Departments Caltech

Abstract The problem to minimize power losses in an electrical network subject to voltage and power constraints is in general hard to solve. However, it has recently been discovered that semidefinite programming relaxations in many cases enable exact computation of the global optimum. Here we point out a fundamental reason for the successful relaxations, namely that the passive network components give rise to matrices with nonnegative offdiagonal entries. Recent progress on quadratic programming with Metzler matrix structure can therefore be applied.

关键词： Power flow optimization relaxation analysis

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Secondary Voltage control for Harmonics Suppression in Islanded Microgrids

Secondary Voltage Control for Harmonics Suppression in Islan...

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IEEE Power and Energy Society General Meeting

作者： Xiongfei Wang Josep M. Guerrero Frede Blaabjerg Zhe Chen Department of Energy Technology Aalborg University Department of Automatic Control Systems and Computer Engineering Technical University of Catalonia

ISBN: (纸本)9781457710001

This paper proposes a secondary voltage waveform control approach to suppress harmonics in islanded microgrids. Compared with the secondary control for traditional large power systems, the proposed control scheme can regulate the voltage waveform instead of voltage magnitude of sensitive buses in islanded microgrids. In addition to the centralized controller for fundamental frequency voltage component, a selective harmonic compensator is implemented in the secondary voltage control system. With the help of Park transformation, the cyclic references generated by the selective harmonic compensator passed through a low-bandwidth communication system to each primary control system for distributed generation units. Thus, combined with the high-bandwidth local voltage controllers in the primary control systems, harmonic voltage distortions in islanded microgrids are redistributed and reduced. Simulations are performed to validate the effectiveness of the proposed control approach.

关键词： Microgrid Hierarchical control Secondary voltage control Harmonic voltage distortion secondary voltage control stepping controls MICRO-GRID Harmonic voltage distortion control systems harmonics Voltage regulators Park's transformation Voltage regulation Harmonic reduction central controller voltage magnitude voltage waveform

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Maneuvering target tracking method based on unknown but bounded uncertainties

Maneuvering target tracking method based on unknown but boun...

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作者： Rahmati, Hodjat Khaloozadeh, Hamid Ayati, Moosa Faculty of Electrical and Computer Engineering Systems and Control Department K. N. Toosi University of Technology Tehran Iran

ISBN: (纸本)9783902661937

In this paper a new maneuvering target tracking method based on a model with unknown but bounded uncertainties is proposed. Firstly, a model with unknown but bounded uncertainties is proposed. Then, an algorithm for tracking the target in both maneuvering and non-maneuvering cases is generated. The proposed method can be used for a large diversity of input types. Also, this method does not require maneuver detection and covariance resetting that are necessary in previous maneuvering target tracking methods. Therefore, it doesn't consume any time for maneuver detection and covariance resetting. Also simulation results are provided to confirm the theoretical development. © 2011 IFAC.

关键词： Target tracking

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