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Efficient allocation of distributed object-oriented tasks to a pre-defined scheduled system

International Journal of computers and Applications 2006年第1期28卷 35-42页

作者： Fergany, T. Sarhan, Amany Computer Science Department New Heaven University New Heaven City CT United States Computers and Automatic Control Engineering Faculty of Engineering Tanta University Egypt University of New Haven Department of Computer Science Computers and Automatic Control Department Tanta University

key phase in the design process of software for distributed systems is the allocation of the software components to the available hardware. A problem arises when a software/hardware mismatch occurs. This paper presents a solution to that problem by introducing a technique that guarantees efficient allocation of predefined scheduled object-oriented software components to the available hardware based on genetic algorithm. The allocation is to be made dynamically in a system with a predefined schedule. We thus modified the parameters of the genetic search technique to allow converging to the best solution in a relatively short time to be suitable for the dynamicity of the allocation. The performance of the allocation technique is evaluated in terms of the time cost (CPU clock pulses for more generality) required for the GA search to converge to the optimal allocation structure of the software components. The results obtained by the proposed technique are compared against the results from the branch-and-bound search technique. The experimental results indicate the effectiveness of the proposed technique in reaching the optimal allocation in considerable time, showing that it requires much less time than branch-and-bound.

关键词： Object oriented programming

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On the Impact of Plant Model and controller Sophistication on Performance of Disturbance Attenuation and System Robustness

On the Impact of Plant Model and Controller Sophistication o...

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IEEE Conference on Decision and control

作者： M. J. Blachuta G. Bialic Department of Automatic Control Silesian Technical University Gliwice Poland Department of Electrical Engineering Automatic Control and Computer Science Technical University of Opole Opole Poland

ISBN: (纸本)1424401704;9781424401703

In the paper the problem of disturbance attenuation performance in single-loop control system is investigated. Modified MV control strategy with bounded control variance is used as benchmark for both LQG and classically and optimally tuned PID-type controllers. Certain time and frequency domain functions are then examined to further assess the control performance in terms of robustness. It has been shown that as long as the system to be controlled is delay-free, and there is no extreme demand on performance, simple lag-delay system model along with optimally tuned PID control algorithm provides control quality similar to that of LQG controlled original system assuming the same bound on control signal variance. Although the classical performance measure based on substitute delay indicates then almost optimal performance, there is still room for additional improvement that can be attained using both PID and LQG controllers and more sophisticated original delay-free model. The price paid is much larger control variance. It is interesting to note that while LQG systems remain robust this is not longer valid for PID controllers

关键词： Attenuation Robust control Optimal control Delay Three-term control control systems automatic control control system synthesis Performance analysis USA Councils

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A RISK MANAGEMENT CRITERION FOR AN UNSTABLE WASTEWATER TREATMENT PROCESS

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IFAC Proceedings Volumes 2006年第2期39卷 171-176页

作者： Jonathan Hess Olivier Bernard Malcolm Djuric French Research Institute of Computer Science and Automatic Control. COMORE Research Team. Sophia Antipolis 06902 France

In this paper we consider an unstable biological process used for wastewater treatment. This anaerobic digestion ecosystem can have 2 locally stable steady states and one unstable steady state. We first study the model and characterise the attraction basin associated to the normal operating mode. In a second step we estimate the size of this attraction basin by using a simplified criterion that turns out to be a good approximation. Finally we apply the approach on a real anaerobic digestion plant, and we show that the proposed criterion allows to rapidly detect the conditions of a destabilisation.

关键词： Haldane model Anaerobic digestion Nonlinear systems diagnosis

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Memory-Aware Feedback Scheduling of control Tasks

Memory-Aware Feedback Scheduling of Control Tasks

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International Conference on Emerging Technologies and Factory Automation (ETFA)

作者： Sven Gestegard Robertz Dan Henriksson Anton Cervin Department of Computer Science Lund University Sweden Department of Automatic Control Lund University Sweden

This paper presents the incorporation of an auto-tuning real-time garbage collector into a feedback-based on-line scheduling system. The studied feedback scheduler is designed to dynamically adjust the sampling periods of a set of controller tasks in order to maximize the overall control performance. In the suggested approach, the memory management overhead is made explicit and taken into account by the feedback scheduler when scheduling the tasks. It is also described how priorities for memory allocations can be used to control the allocation rates of the application threads in order to optimize the trade-off between memory and CPU time usage. A case study, comparing theoretical analysis and simulated results support the feasibility of the approach.

关键词： Feedback Memory management Real time systems control systems Processor scheduling automatic control Resource management Sampling methods Power system management Dynamic scheduling

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A Fast Method For Knock Detection Using Wavelet Transform

A Fast Method For Knock Detection Using Wavelet Transform

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International Conference on Mixed Design of Integrated Circuits and Systems (MIXDES)

作者： J. Fiolka Faculty of Automatic Control Electronics and Computer Science Institute of Electronics Silesian University Of Technology Gliwice Poland

Knock in spark ignition (SI) engines is an undesired spontaneous auto-ignition of the unburned gas mixture, causing high combustion pressure pulses associated with vibration of the engine block. Knocking combustion limits performance, durability and produce more pollutants. In the paper the author proposes a fast knock detection method based on wavelet transform

关键词： Wavelet transforms Combustion Sparks Engine cylinders Signal analysis Resonant frequency Pressure control Ignition Time frequency analysis Pressure measurement

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Speaker Identification And Verification Based On Cepstral Features And Fuzzy Nonlinear Classif

Speaker Identification And Verification Based On Cepstral Fe...

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International Conference on Mixed Design of Integrated Circuits and Systems (MIXDES)

作者： A. Dustor Institute of Electronics Faculty of Automatic Control Electronics and Computer Science Silesian University of Technology Gliwice Poland

This paper presents an application of fuzzy nonlinear classifier to speaker identification and verification. This classifier is closely related to a modification of a classical Takagi-Sugeno-Kang inference system and is based on a fuzzy moving consequents in If-Then rules. Since fuzzy classifiers based on structural risk minimization have not been applied in speaker recognition area so far, this work presents a novel approach to the problem of speaker modeling. Although voice biometrics is dominated by statistical approach like Gaussian mixture models GMM's and vector quantization VQ, other speaker recognition methods are demanded, especially those which do not require a lot of training utterances and have good generalization properties. All research is based on Polish speech corpus ROBOT designed for testing speech algorithms. Provided results show that fuzzy approach may have similar or even better performance than standard methods

关键词： Cepstral analysis Speaker recognition Speech Takagi-Sugeno-Kang model Fuzzy systems Risk management Biometrics Vector quantization Robots Algorithm design and analysis

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Robust Interval Observers for Uncertain Chaotic Systems

Robust Interval Observers for Uncertain Chaotic Systems

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IEEE Conference on Decision and control

作者： Marcelo Moisan Olivier Bernard French Institute of Research on Computer Science and Automatic Control Comore Research Team Sophia-Antipolis France

ISBN: (纸本)1424401704

In this paper we develop and apply a robust interval observer to estimate the unknown variables of uncertain chaotic systems. Considering that bounds of the uncertainties are known, we propose an observer that computes guaranteed upper and lower bounds for the unknown variables. We show that practical estimation (observer based synchronization) is asymptotically reached with bounded interval estimates. The method is applied to the synchronization of Chua's chaotic system

关键词： Robustness Chaos Chaotic communication Observers automatic control Master-slave Uncertainty State estimation control systems Robust control

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Processing of Tactile/Force Measurements for a Fully Embedded Sensor

Processing of Tactile/Force Measurements for a Fully Embedde...

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International Conference on Multisensor Fusion and Integration for Intelligent Systems (MFI)

作者： Giorgio Cannata Marco Maggiali Mechatronics and Automatic Control Laboratory Department of Communication Computer and System Science University of Genova Genoa Italy Mechatronics and Automatic Control Laboratory Italian Institute of Technologies University of Genova Genoa Italy

A new fully embedded tactile/force sensor system to be installed on the phalanges of a robot hand is presented in this paper. Each sensor consists of a distributed array of analog tactile elements and an integrated three-component force transducer with embedded analog and digital electronics. The tactile sensor is a matrix of electrodes etched on a flexible printed circuit board covered by pressure conductive rubber. The force sensor is an off-the-shelf integrated three components micro-joystick. Communications of the sensors with other control modules are implemented with a CAN bus link. A local processing technique is proposed to enable the transmission of both tactile and force data using a single CAN message, and eventually validate through simulative and experimental tests

关键词： Force measurement Tactile sensors Force sensors Sensor arrays Robot sensing systems Transducers Transmission line matrix methods Electrodes Etching Flexible printed circuits

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Estimation of knock intensity in Spark-Ignition engines by using wavelet transform

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IFAC Proceedings Volumes 2006年第21期39卷 316-321页

作者： Jerzy Fiołka Silesian University of Technology Faculty of Automatic Control Electronics and Computer Science Institute of Electronics ul. Akademicka 16 44-100 Gliwice Poland

Knock in spark ignition (SI) engines is an undesirable mode of combustion, causing high combustion pressure pulses associated with vibration of the engine block. This phenomenon limits performance, durability and fuel economy of SIengines. In this paper the author propose; a new knock detection method called WBKD (Wavelet Based Knock Detection), which is based on wavelet transform. Real data experiments confirmed the utility of the proposed approach for knock intensity estimating.

关键词： Automotive control Time-frequency representation Signal detection Signal processing

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Numerical Simulation of the Transient Railway Traction Motor with Frequency control

Numerical Simulation of the Transient Railway Traction Motor...

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IEEE International Conference on Automation, Quality and Testing, Robotics, AQTR

作者： Vasile Tulbure Rodica Festila Eva Dulf Tiberiu Colosi Faculty of Automation and Computer Science Department of Automatic Control Technical University of Cluj Napoca Cluj-Napoca Romania

Continuing the papers by Tulbure et al. (2004), are presented some significant results of numerical simulations for railway traction motors, which can be treated as components of electrical locomotives EC-43, by 3.6 MW, with 80t mass. For the starting mode of operation in frequency steps of Deltaf=2.5 Hz, with the slip S c =0.1, are interesting the evolution and interpretation of r.m.s. values of input voltage U 1 [V], stator current I 1 [A], traction force F T [t], developed power P[kW] and speed v[km/h]. It is imposed the maintenance of excitation flux at nominal value Psi=2.73[Wb]

关键词： Numerical simulation Rail transportation Traction motors Frequency control Voltage Data mining Stators Taylor series Calculus Automation

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