Căutare Scientific papers - Annals of "Dunarea de Jos" University of Galati - Analele științifice ale Universității "Dunărea de Jos" din Galați după Data publicării

Afișează articolele 641-660 of 1845

    • 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 ...

    • 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 ...

    • 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 ...

    • 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 ...

    • 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 ...

    • 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 ...

    • Optimal Control Development System for Electrical Drives 

      Găiceanu, Marian; Roşu, Emil; Păduraru, Romeo; Dache, Cristinel ("Dunarea de Jos" University of Galati, 2008)
      In this paper the optimal electrical drive development system is presented. It consists of both electrical drive types: DC and AC. In order to implement the optimal control for AC drive system an Altivar 71 inverter, a ...

    • Estimation of Steel Solidified Layer Thickness, for Continuous Casting Control Purposes 

      Munteanu, Mihai; Ceangă, Emil (2008)
      An important goal in continuous casting automation process rest in establishing a proper casting speed being able to assure a compromise between machine productivity and solidified skin cracking protection on the mould ...

    • 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 ...

    • 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 ...

    • 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 ...

    • 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 ...

    • 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 ...

    • 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, ...

    • 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 ...

    • 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 ...

    • The Role of Certification in the Brazilian Fruit Chain 

      Dorr, Andréa Cristina (Universitas Galatiensis, 2008-01)
      Concerns about food safety and standards in the developed countries, particularly in Europe and the United States have made certification inevitable for worldwide fruit producers who target such export markets. The fact ...

    • EU Strategies and the Role of Education for Sustainable Development 

      Tureac, Cornelia Elena; Turtureanu, Anca Gabriela (Universitas Galatiensis, 2008-01)
      In June 2006 the European Union decided upon a new Strategy for Sustainable Development. Together with the Lisbon Strategy that was revised in 2005, there is now some coherence between the two strategies which had been ...