Annals of the University "Dunarea de Jos" of Galati. Fascicle III: Electrotechnics, Electronics, Automation Control and Informatics: Recent submissions

Afișează articolele 21-40 of 230

    • Proton Exchange Membrane Fuel Cell Modelling Using Moving Least Squares Technique 

      Tîrnovan, R.; Giurgea, S.; Miraoui, A. ("Dunarea de Jos", 2009)
      Proton exchange membrane fuel cell, with low polluting emissions, is a great alternative to replace the traditional electrical power sources for automotive applications or for small stationary consumers. This paper ...

    • Spatio-Temporal Dynamics in Celular Neural Networks 

      Goras, Liviu ("Dunarea de Jos" University of Galaţi, 2009)
      Analog Parallel Architectures like Cellular Neural Networks (CNN’s) have been thoroughly studied not only for their potential in high-speed image processing applications but also for their rich and exciting spatio-temporal ...

    • Learning Bayesian Dependence Model for Student Modelling 

      Cocu, Adina ("Dunarea de Jos" University of Galati, 2008)
      Learning a Bayesian network from a numeric set of data is a challenging task because of dual nature of learning process: initial need to learn network structure, and then to find out the distribution probability tables. ...

    • Recommendation Process SRI Web Document Recommender System 

      Minteanu, Dan ("Dunarea de Jos" University of Galati, 2008)
      This paper presents a recommender system for web documents (given as bookmarks). The system uses for classification a combination of content, event and collaborative filters and for recommendation a modified Pearson-r ...

    • Web User Profile Using XUL and Information Retrieval Techniques 

      Munteanu, Dan ("Dunarea de Jos" University of Galati, 2008)
      This paper presents the importance of user profile in information retrieval, information filtering and recommender systems using explicit and implicit feedback. A Firefox extension (based on XUL) used for gathering data ...

    • Pid Self-Tuning Controllers Used in Different Structures of the Control Loops 

      Dugan, Viorel; Dan, Adrian; Ionescu, Clara; Cotrumba, Mirela ("Dunarea de Jos" University of Galati, 2008)
      The paper investigates the behavior of digital PID self-tuning controllers (STC) in different structures of the control loops used in adaptive systems. In the two phases of this type of systems which use a STC-PID, the ...

    • Selection of the Diagnostic Hypotheses Through Fuzzy Decizion in Medical Diagnosis System 

      Munteanu, Sabina (The Annals of "Dunarea de Jos" University of Galati, 2008)
      The paper presents an evaluation of the diagnostic hypotheses’ selection step within the medical diagnosis hybrid system DiaMed. Medical diagnoses are described in DiaMed through fuzzy decision functions that are used ...

    • Modelling and Simulation of Static Var Compensator(SVC) in Power System Studies by Matlab 

      Boudjelia, Houari; Gherbi, Fatima Zobra; Lakdja, Fatiha ("Dunarea de Jos" University of Galati, 2008)
      This paper presents the modelling and simulation of Static Var Compensator (SVC) in power system studies by MATLAB. In the first step, we have modeled mathematically with MathCAD how to analyze the rating of SVC (Boudjella, ...

    • Fast Acting Robust Controller for Pitch Control System 

      Khuntia, P.S.; Mitra, Debja ("Dunarea de Jos' University of Galati, 2008)
      In this paper a classical feedback controller has been designed to furnish fast acting characteristics in the face of parametric perturbation using two parameters, Generalized Time Constant and Characteristic Ratios. The ...

    • The Appoach for Optimization of Transmission Over Power Links Using the Thyristor-Controlled Series Compensation 

      Gherbi, Fatima Zohra (The Annals of "Dunarea de Jos" University of Galati, 2008)
      The energy transportation networks can be improved by multiplying or creating new lines. This is not always the case for various reasons. The series capacities controlled by SCRs (Silicon Controlled Rectifiers) represent ...

    • An Efficient DC-DC Converter with Bidirectional Power Flow 

      Rajarajeswari, N.; Thanushkodi, K. ("Dunarea de Jos" University of Galati, 2008)
      This paper introduces a Bi-directional DC-DC converter with adaptive fuzzy logic controller. Bidirectional power flow is obtained by same power components and provides a simple, efficient, and galvanically isolated ...

    • Mathematical Modeling and Simulation Photovoltaic Converter Operation When Varying Parameters 

      Constantin, Miholcă; Munteanu, Cristian; Nicolau, Viorel ("Dunarea de Jos" University of Galati, 2008)
      The paper presents a method of mathematical modelling of a solar converter using the results of full-scale testing. The advantages of analytical modelling method applied to photovoltaic systems are also presented; this ...

    • Strategies Used for Developing Micro-CCHP Structures in Residential and Public Buildings 

      Badea, Nicolae ("Dunarea de Jos" University of Galati, 2008)
      The current paper deals with the efficient use of the fossil fuels in the context of DER/DG concept through a unitary approach of the necessary electrical power and thermal energy of an urban residential quarter and ...

    • Optimal Convex Controller and Model Reduction for a Dynamic System 

      Khuntia, P. S; Mitra, Debjani ("Dunarea de Jos" University of Galati, 2008)
      This paper presents analysis and design of a family of controllers based on numerical convex optimization for an aircraft pitch control system. A design method is proposed here to solve control system design problems in ...

    • Mathematical Analysis of Uncertainty 

      Garrido, Angel ("Dunarea de Jos" University of Galati, 2008)
      Classical Logic showed early its insufficiencies for solving AI problems. The introduction of Fuzzy Logic aims at this problem. There have been research in the conventional Rough direction alone or in the Fuzzy direction ...

    • Modelling Inteligent Systems With Level Petri Nets 

      Bocăneală, Corina ("Dunarea de Jos" University of Galati, 2008)
      Level Petri Nets are formalism for modeling hierarchical multi-agent system. They are a Petri nets extension, allowing tokens to be nets themselves. This paper is inspired by two classes of level Petri nets: object Petri ...

    • An Algorithm for Thresholding in the Context of Signal Denoising with Wavelets 

      Gogu, Anisia; Aiordăchioaie, Dorel ("Dunarea de Jos" University of Galati, 2008)
      The problem of estimating a signal corrupted by additive noise has been of interest to many researchers for practical as well as theoretical reasons. Wavelet based methods have become increasingly popular, due to a number ...

    • MPPT Algorithm for Small Wind Systems Based on Speed Control Strategy 

      Vlad, Ciprian; Ceangă, Emil ("Dunarea de Jos' University of Galati, 2008)
      This paper presents experimental results of an autonomous low-power wind energy conversion system (WECS), based on a permanent-magnet synchronous generator (PMSG) connected directly to the wind turbine. The purpose of ...

    • Multivariable Intelligent Control for M.A.G. Welding Process 

      Miholcă, Constantin; Nicolau, Viorel; Munteanu, Cristian; Mihăilescu, Dănuţ ("Dunarea de Jos" University of Galati, 2008)
      A neural control technique, applied to the MAG (Metal-Active Gas) welding process, is presented in the paper. The static nonlinear model of welding process is based on experimental determinations. The geometric parameters ...

    • Control of a Multivariable Web Winding System 

      Rabbah, Nabila; Bensassi, Bahloul ("Dunarea de Jos" University of Galati, 2007)
      To guarantee a good productivity and a better quality of the industrial systems, it is necessary to know the evolution of its various parameters but also its operation mode. The main goal of this work is to carry out a ...