Scientific papers - Annals of "Dunarea de Jos" University of Galati - Analele științifice ale Universității "Dunărea de Jos" din Galați: Recent submissions

Afișează articolele 1221-1240 of 1845

    • 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 ...

    • Buck Supplies Outiput Voltage Ripple Reduction Using Fuzzy Control 

      Bizon, Nicu ("Dunarea de Jos" University of Galati, 2007)
      Using the PWM control for switching power supplies the peaks EMI noise appear at the switching frequency and its harmonics. Using randomize or chaotic PWM control techniques in these systems the power spectrum is spread ...

    • The Optimal Control for D.C. Position Drive System 

      Munteanu, Traian ("Dunarea de Jos" University of Galati, 2007)
      A position drive system with D.C. motor is operated using conventional position, speed and current controls. These controls provide a good dynamic and steady-state behaviour, but they do not take in consideration the ...

    • Thermal Processes Identification Using Virtual Instrumentation 

      Olah, Iosif; Hulea, Nicoleta Ştefania; Măstăcan, Lucian; Vornicu, Octavian Costel ("Dunarea de Jos" University of Galati, 2007)
      In this paper the experimental identification problem of thermal processes is presented, in order to establish their mathematical models which permit the adoption of the automation solutions, respectively the specification ...

    • Omline industrial Proces Broacast and Control Based on IP and Serial Networks 

      Paraschiv, Nicolae; Popa, Alexandru; Popa, Cristian ("Dunarea de Jos" University of Galati, 2007)
      The Internet network in conjunction with a strong security policy can be an ideal online broadcast system for the industrial processes monitoring and control. Because the distributed controllers are connected through ...

    • Immpact of Bandwidth for Various Services in Heterogeneous Network and Quality of Service Via Communication Technologies in Malaysian Higher Educational 

      Mohd Zin, Abdullah; Ismail, Mohd Nazri ("Dunarea de Jos" University of Galati, 2007)
      This study focuses on heterogeneous services and communication technologies for retrieving and sending information between students and lecturers in Malaysian higher educational institutes. It intends to investigate pattern ...

    • Sliding-Mode Adaptive Control of Pioneer 3-DX Wheeled Mobile Robot 

      Filipescu, Adrian; Stancu, Alexandru ("Dunarea de Jos" University of Galati, 2007)
      Parameter identification scheme and discrete-time adaptive sliding-mode controller applied to Pioneer 3-DX wheeled mobile robot (WMR) are presented in this paper. The dynamical model for mobile robot with one pair of active ...

    • Invariance Properties of Time-Varying Linear Systems 

      Păstrăvanu, Octavian; Matcovschi, Mihaela ("Dunarea de Jos" University of Galati, 2007)
      This paper formulates and proves two types of necessary and sufficient conditions for the characterization of positively (flow) invariant sets with respect to the state-space trajectories of the time-varying (non-autonomous) ...

    • 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 ...

    • 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 ...

    • Force Prediction in Cold Rolling Mills by Polynomial Methods 

      Roman, Nicu; Aiordăchioaie, Dorel; Ceangă, Emil; Bivol, Ion ("Dunarea de Jos" University of Galati, 2007)
      A method for steel and aluminium strip thickness control is provided including a new technique for predictive rolling force estimation method by statistic model based on polynomial methods.

    • Sift Based Algorithm for Point Feature Tracking 

      Burlacu, Adrian; Copot, Cosmin; Lazar, Corneliu ("Dunarea de Jos" University of Galati, 2007)
      In this paper a tracking algorithm for SIFT features in image sequences is developed. For each point feature extracted using SIFT algorithm a descriptor is computed using information from its neighborhood. Using an algorithm ...