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Formal Descriptions of a Set of Meta Cognitive Processes of the Brain

Formal Descriptions of a Set of Meta Cognitive Processes of ...

引用

IEEE International Conference on Cognitive informatics

作者： Yingxu Wang International Center for Cognitive Informatics (ICfCI) Theoretical and Empirical Software Engineering Research Center Department of Electrical and Computer Engineering Schulich Schools of Engineering University of Calgary Calgary AB Canada

A set of fundamental cognitive processes of the brain is formally described in this paper. The cognitive processes defined at the meta cognitive level of the layered reference mode of the brain (LRMB) encompass those of object identification, concept establishment, categorization, comparison, qualification, quantification, selection, and search . Real-time process algebra (RTPA) is adopted as the denotational mathematical means for rigorous modeling and describing the meta cognitive processes. The mathematical model of each meta process is created and modeled in RTPA. All cognitive models and processes are explained on the basis of the object- attribute-relation (OAR) model for internal information and knowledge representation and manipulation.

关键词： Mathematical model Cognitive informatics Qualifications Algebra Brain modeling Knowledge representation Mathematics Software engineering Drives Neurons

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Parameter estimation of a DC/DC Buck converter using a continuous time model

Parameter estimation of a DC/DC Buck converter using a conti...

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2007 European Conference on Power Electronics and Applications, EPE

作者： Buiatti, Gustavo Malagoni Amaral, Acacio Manuel Raposo Cardoso, Antonio João Marques Alstom Transport Rue Docteur Guinier 65600 Semeac France Department of Informatics and Systems Polytechnic Institute of Coimbra ISEC Rua Pedro Nunes-Quinta da Nora P-3030-199 Coimbra Portugal Department of Electrical and Computer Engineering University of Coimbra Polo II - Pinhal de Marrocos P-3030-290 Coimbra Portugal

ISBN: (纸本)9075815115

In this paper, a novel online technique for estimating the parameters of a DC/DC Buck converter through a continuous time model is proposed. Standard least mean squares algorithm is applied among other formulations, taking into account only the non conduction state during a single switching cycle. The problem of derivative calculation of the needed voltage and current signals is solved by polynomial interpolation.

关键词： Parameter estimation

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ESR Estimation Method for DC/DC Converters Through Simplified Regression Models

ESR Estimation Method for DC/DC Converters Through Simplifie...

引用

Conference Record of the IEEE Industry Applications Society Annual Meeting (IAS)

作者： G. M. Buiatti A. M. R. Amaral A.J. C. Cardoso Alstom Transport Semeac France Department of Informatics and Systems Polytechnic Institute of Coimbra Coimbra Portugal FCTUC / IT Department Electrical & Computer Engineering University of Coimbra Coimbra Portugal

In this paper, simplified regression models useful for parameter extraction are obtained from the hybrid models of Buck and Boost DC/DC converters. These models are used in the ESR estimation of output filter capacitors present in the same circuits for diagnostic purposes. Advantages obtained through the simplified models are outlined regarding the original complete regression models obtained from the respective hybrid models. The simplified and the original parameter estimation methods are both applied and compared between them regarding accuracy, data processing time and reliability of the implemented algorithms. Results obtained from simulations and experimental results are presented.

关键词： Paramagnetic resonance DC-DC power converters Mathematical model Circuits Parameter estimation Power electronics Power system modeling Power system dynamics Topology Power system reliability

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Optimal synchronization frequency for dynamic pipelined computations on heterogeneous systems

Optimal synchronization frequency for dynamic pipelined comp...

引用

IEEE International Conference on Cluster Computing

作者： F. M. Ciorba I. Riakiotakis T. Andronikos A. T. Chronopoulos G. Papakonstantinou School of Electrical and Computer Engineering National and Technical University of Athens Athens Greece Department of Computer Science University of Technology San Antonio TX USA Department of Informatics Ionian University Corfu Greece

In this paper we give a theoretical model for determining the synchronization frequency that minimizes the parallel execution time of loops with uniform dependencies dynamically scheduled on heterogeneous systems. Using this model we determine the synchronization frequency that minimizes the estimated parallel time. The accuracy of our method is validated through experiments on a heterogeneous cluster. The results show that the synchronization frequency minimizing the parallel time determined by our method, is very close to the synchronization frequency found experimentally.

关键词： Synchronization Pipelines Program processors Computational modeling Frequency synchronization Processor scheduling Time frequency analysis

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Parameter Estimation of a DC/DC Buck converter using a continuous time model

Parameter Estimation of a DC/DC Buck converter using a conti...

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European Conference on Power Electronics and Applications

作者： Gustavo Malagoni Buiatti Acacio Manuel Raposo Amaral Antonio Joao Marques Cardoso Alstom Transport Semeac France Department of Informatics and Systems Polytechnic Institute of Coimbra ISEC Coimbra Portugal Department of Electrical and Computer Engineering University of Coimbra Coimbra Portugal

ISBN: (纸本)9789075815115

In this paper, a novel online technique for estimating the parameters of a DC/DC buck converter through a continuous time model is proposed. Standard least mean squares algorithm is applied among other formulations, taking into account only the non conduction state during a single switching cycle. The problem of derivative calculation of the needed voltage and current signals is solved by polynomial interpolation.

关键词： Parameter estimation Buck converters Continuous time systems Capacitors Paramagnetic resonance Fault diagnosis Electronic mail Power system reliability Frequency MOSFET circuits

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An unified method for estimating the parameters of non-isolated DC/DC converters using continuous time models

An unified method for estimating the parameters of non-isola...

引用

International Conference on Telecommunications Energy (INTELEC)

作者： Gustavo M. Buiatti Acacio M. R. Amaral A. J. Marques Cardoso Alstom Transport Semeac France ISEC-Department of Informatics and Systems Polytechnic Institute of Coimbra Coimbra Portugal FCTUC/IT-Department of Electrical and Computer Engineering University of Coimbra Coimbra Portugal

In this paper, a novel online technique used for estimating the parameters of non-isolated buck, boost and buck-boost DC/DC converters is presented. Continuous time models of each converter are used in the estimation procedure, where the derivative calculation problem of needed signals is solved by polynomial interpolation. Least mean squares algorithm is then applied together with other calculations. The knowledge of these parameters may be used in the fault diagnosis of such converters. Results obtained from simulations are presented, followed by experimental results in which the inductance, capacitance, load resistor and ESR of the capacitor are estimated, in order to validate the proposed technique.

关键词： Parameter estimation DC-DC power converters Continuous time systems Polynomials Interpolation Least mean square algorithms Fault diagnosis Inductance Capacitance Resistors

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Fault Simulation Technique for Switch Mode Power Supplies

Fault Simulation Technique for Switch Mode Power Supplies

引用

2007 International Aegean Conference on electrical Machines and Power Electronics, vol.1

作者： Acacio M. R. Amaral A. J. Marques Cardoso Department of Electrical and Computer Engineering Pólo II-Pinhal de Marrocos University of Coimbra Coimbra Portugal Department of Informatics and Systems Polytechnic Institute of Coimbra Coimbra Portugal

The aim of this paper is to present a fault simulation technique that could help engineers to study the consequences of faults in the output filter of a switch mode power supply. To do so, in this paper, it is presented two techniques: a new experimental off-line technique based in the DFT algorithmic, which can determine the equivalent circuit of capacitors at the operating frequency of the converter, and a simulation technique based in Laplace transform, which could predict the behavior of the converter. Simulation and experimental results will be presented in order to prove the applicability of both techniques.

关键词： Switches Power supplies Circuit faults Circuit simulation Power engineering and energy Filters Equivalent circuits Switched capacitor circuits Frequency conversion Predictive models

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On-Line Optimization of Switched-Mode Systems: Algorithms and Convergence Properties

On-Line Optimization of Switched-Mode Systems: Algorithms an...

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Proceedings of the 46th IEEE Conference on Decision and Control, Pages 1-459

作者： Y. Wardi X.C. Ding M. Egerstedt S. Azuma School of Electrical and Computer Engineering Georgia Institute of Technology Atlanta GA USA Department of Systems Science Graduate School of Informatics Kyoto University Kyoto Japan

ISBN: (纸本)9781424414970;1424414970

This paper concerns the problem of on-line (real-time) computation of solutions to the optimal switching time problem in hybrid systems. The systems under consideration are autonomous, and the performance measure to be optimized has the form of a cost functional defined on the state trajectory. The state variable cannot, however, be measured directly and it has to be estimated by a suitable observer. In this paper, we propose an on-line optimization algorithm based on the state observer, and derive bounds on its convergence rate.

关键词： State variable switching pattern Observers IN-LINE Optimization algorithms hybrid systems Converge real-time computation state trajectory

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Content Orientation in Integrated Product Modeling

Content Orientation in Integrated Product Modeling

引用

IEEE International Conference on Intelligent engineering Systems (INES)

作者： Laszlo Horvath Imre J. Rudas Gerhard P. Hancke John von Neumann Faculty of Informatics Budapest Technology Institute of Intelligent Engineering Systems Budapest Hungary Department of Electrical Electronic and Computer Engineering University of Pretoria Pretoria South Africa

Changes in engineering for development of product in the direction of increased complexity, more variants, and customer demand orientation stimulates implementation of advanced information technology in the form of virtual space. For this reason, concept of integrated product model has been implemented in comprehensive descriptions for lifecycle management of product information. Communication between engineer and modeling procedure is a critical factor. The authors identified data orientation of the recent integrated product modeling as a barrier for more efficient communication on user interfaces of product modeling systems. As a possible contribution to development of solution for this problem in industrial professional modeling systems, they propose content oriented layers between human and data oriented models in this paper. Following this, integration issues in content oriented product model are discussed. Next, relevant functions and modeling techniques for the handling of modeled object information are introduced and evaluated. Finally, a method is shown for the propagation of changes initiated for modeled objects in their affect zones.

关键词： Humans ISO standards Information technology User interfaces computer aided manufacturing CADCAM Automation Standards development Intelligent systems Systems engineering and theory

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A Novel Subband Decomposition Based Speckle Noise Reduction Algorithm for SAR Images

A Novel Subband Decomposition Based Speckle Noise Reduction ...

引用

International Conference on Recent Advances in Space Technologies (RAST)

作者： Gokhan Karasakal I. Erer Informatics Institute Advanced Technologies in Engineering Computer Science and Engineering Istanbul Technical University Istanbul Turkey Faculty of Electrical and Electronic Engineering Electronics and Communication Department Istanbul Technical University Istanbul Turkey

A new speckle reduction algorithm based on subband decomposition and multiscale edge detection is presented. The subband decomposition is performed using a DFT/RDFT-based symmetric, zero-phase, nonoverlapping digital filter bank. The noisy images are decomposed into sub-images using RDFT transform based subband decomposition, an edge image is obtained for each level using these sub-images, then a threshold value is estimated according to noise variance in each subband and soft-thresholding is applied on the non-edge regions of the subband images. The despeckled image is obtained from the thresholded subband images using the inverse RDFT transform. The proposed speckle reduction method is applied to several test images corrupted by speckle noise as well as experimental RADARSAT/SAR images. Despeckled images show that this method has better performance than the case where no edge information is used.

关键词： Speckle Noise reduction Discrete wavelet transforms Discrete Fourier transforms Noise level Image edge detection Radar polarimetry Digital filters Microwave filters Filtering

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