• Spectral Density Correction of a Signal at Frequency Variable Transformation 

      Nicolau, Viorel; Popa, Rustem; Miholca, Constantin ("Dunarea de Jos" University of Galati, 2006)
      The goal of this paper is to determine analytical expression for the spectral density function of a signal, affected by a known frequency transformation, which do not modify the process energy. Such transformations of ...
    • Cellular Automata Codebooks Applied to Compact Image Compression 

      Dogaru, Radu; Glesner, Manfred; Tetzlaff, Ronald ("Dunărea de Jos" Universiti of Galati, 2006)
      Emergent computation in semi-totalistic cellular automata (CA) is used to generate a set of basis (or codebook). Such codebooks are convenient for simple and circuit efficient compression schemes based on binary vector ...
    • Sonar Target Localization Based on Spike Coded Spectrograms 

      Peremans, Herbert; Fontaine, Bertrand ("Dunarea de Jos" University of Galati, 2006)
      Target location is coded into the pattern of spikes that run up the auditory nerve to the bat's brain. Realistic scenes containing multiple, closely spaced, reflectors give rise to complex echo signals consisting of multiple ...
    • Minimizing the Error Tracking of Mobile Terminals by Kalman Filtering 

      Bogdan, Ion (2006)
      A method to track mobile terminals in a cellular communication network is presented. It uses the received field strength from the surrounding base stations. A subsequent Kalman filtering is used to minimize the tracking error.
    • Distribution Systems Optimization with Computational Intelligence Algorithms 

      Gavrilas, Mihai; Ivanov, Ovidiu ("Dunarea de Jos" University of Galati, 2006)
      A dual particle swarm optimization - immune algorithm solution is presented in this paper to deal with the problem of optimum radial reconfiguration and reactive power compensation in distribution systems. The optimization ...
    • Some Rezults Concerning No-Storage Wide-Diesel Systems Control 

      Vlad, Ciprian; Cutululis, Nicolaos Antonio; Lefebvre, Julie; Ceangă, Emil ("Dunarea de Jos" University of Galati, 2006)
      This paper deal with the dynamics of an autonomous no storage wind-diesel system, comprising a diesel generator and a controlled wind system with a hypo/hyper synchronous cascade. The objective is to maximize the wind ...
    • Aspects Regarding the Neuro-Adaptive Control Structura Proprieties. Application to the Nonline Pneumatic Servo System Benchmark 

      Stancu, Alexandru; Puşcaşu, Gheorghe; Codreş, Bogdan ("Dunarea de Jos" Universsity of Galati, 2006)
      Generally, control techniques based on multilayer neural networks are used especially in the case of non-linear process and less in case of linear process, because classical control techniques are good enough and relatively ...
    • An ICA Based Method for Texture Recognition 

      Colţuc, Daniela; Fournel, Thierry; Becker, Jean-Marie; Boutant, Yann ("Dunarea de Jos" University of Galati, 2006)
      The method proposed in this paper uses the Independent Component Analysis (ICA) for an application of unsupervised recognition of textures. The analysed texture is modelled by a weighted sum of almost statistically independent ...
    • Optimal Coding for Qualitative Sources on Noiseless Channels 

      Munteanu, Valeriu; Tarniceriu, Daniela ("Dunarea de Jos" University of Galati, 2006)
      In this paper we perform the encoding for sources which are only qualitatively characterized, that is, each message the source delivers possesses a certain quality, expressed as cost, importance or utility. The proposed ...
    • Possibilistic Networks for Uncertainy Knowledge Processing in Student Diagnosis 

      Cocu, Adina ("Dunarea de Jos" University of Galati, 2006)
      In this paper, a possibilistic network implementation for uncertain knowledge modeling of the diagnostic process is proposed as a means to achieve student diagnosis in intelligent tutoring system. This approach is proposed ...
    • Power Conditioning System Topology For Grid Integration of Wind and Fuel Cell Energy 

      Găiceanu, Marian ("Dunarea de Jos" University of Galati, 2006)
      This paper shows the topology of the hybrid grid-connected power system and the performances of the front-end three-phase power inverter. The renewable sources of the hybrid power system consist of a solid oxide fuel cell ...
    • A Novel Feature Extraction Method for Isolated Word Recognition Based on Nested Temporal Averaging 

      Dogaru, Radu; Costache, Gabriel Nicolae; Dumitru, Octavian; Gavat, Inge ("Dunarea de Jos" University of Galati, 2006)
      A novel preprocessing method is proposed. It has a reduced complexity and therefore is aimed to be used in low power, VLSI implemented, speech recognizers. Our algorithm extracts a feature vector made from up to 3 feature ...
    • Identification of the Non-Linear Systems Using Internal Recurrent Neural Networks 

      Puşcaşu, Gheorghe; Codreş, Bogdan; Stancu, Alexandru ("Dunarea de Jos" University of Galati, 2006)
      In the past years utilization of neural networks took a distinct ampleness because of the following properties: distributed representation of information, capacity of generalization in case of uncontained situation in ...
    • The Influence of Non-Homogenous Dielectric Material in the Waveguide Propagation Modes 

      Badea, Nicolae; Voncilă, Ion ("Dunarea de Jos" University of Galati, 2006)
      The aim of this paper is to indicate the equations of electromagnetic wave in homogenous and non-homogenous dielectric material, estabilising the bundary conditions and solves by FEM the equations of the electromagnetic ...
    • Data Mining for Scientific Publications 

      Vlase, Mihai; Negulescu, Radu ("Dunarea de Jos" University of Galati, 2006)
      Searching scientific literature on the Web is a difficult task because of the large volume and the complex dynamics of the scientific literature and because of the complexity and narrow target of typical queries. The problem ...
    • On the Potential of Using Fractional-Order Systems to Model the Respiratory Impedance 

      Ionescu, Clara; De Keyser, Robin ("Dunarea de Jos" University of Galati, 2006)
      This contribution provides an analysis of the human respiratory system in frequency domain by means of estimating the respiratory impedance. Further on, analysis of several models for human respiratory impedance is done, ...
    • Frequency Content Oriented Modification of Quantization Matrix in DCT-Based Compression 

      Tarniceriu, Daniela; Munteanu, Valeriu; Beldianu, Florin ("Dunarea de Jos" University of Galati, 2006)
      In order to improve the compression rate for comparable values of error metrics, we propose a method to modify the standard quantization matrix used in JPEG, according to image frequency content. Unlike the method which ...
    • Stationary Frame Active Power Filter Control Based on Multiresolution Analysis 

      Culea, Mihai; Dumitriu, Teodor; Nichita, Mihai; Munteanu, Traian ("Dunarea de Jos" University of Galati, 2006)
      The paper presents an active power filter control method. The reference signal is generated in the stationary reference frame α-β using multiresolution analysis and the controllers used are P-resonant controllers, suitable ...
    • Indirect Control of a Single-Phase Active Power Filter 

      Roşu, Emil; Culea, Mihai; Dumitriu, Teodor; Munteanu, Traian ("Dunarea de Jos" University of Galati, 2006)
      The control of shunt active power filters using PWM inverters consists in generating a reference by separating, using different methods, the harmonics to be eliminated. The methods used are time-consuming and need dedicated ...
    • Non-Conventional Method for Friction Compensation in DC Drive Position Tracking 

      Dumitriu, Teodor; Culea, Mihai; Nichita, Mihai; Munteanu, Traian ("Dunarea de Jos" University of Galati, 2006)
      Friction, especially its nonlinear components, may degrade the tracking performance of any servo drive systems. Focused on high precision positioning of DC electrical drive the paper proposes an easy method to compensate ...