Annals of the University "Dunarea de Jos" of Galati. Fascicle III: Electrotechnics, Electronics, Automation Control and Informatics: Recent submissions
Afișează articolele 61-80 of 230
-
The Influence of Non-Homogenous Dielectric Material in the Waveguide Propagation Modes
("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 ... -
Power Conditioning System Topology For Grid Integration of Wind and Fuel Cell Energy
("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 ... -
Non-Conventional Method for Friction Compensation in DC Drive Position Tracking
("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 ... -
Stationary Frame Active Power Filter Control Based on Multiresolution Analysis
("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
("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 ... -
Some Rezults Concerning No-Storage Wide-Diesel Systems Control
("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
("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 ... -
Identification of the Non-Linear Systems Using Internal Recurrent Neural Networks
("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 ... -
Possibilistic Networks for Uncertainy Knowledge Processing in Student Diagnosis
("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 ... -
Data Mining for Scientific Publications
("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
("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, ... -
Distribution Systems Optimization with Computational Intelligence Algorithms
("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 ... -
Spectral Density Correction of a Signal at Frequency Variable Transformation
("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 ... -
An ICA Based Method for Texture Recognition
("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 ... -
Frequency Content Oriented Modification of Quantization Matrix in DCT-Based Compression
("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 ... -
Cellular Automata Codebooks Applied to Compact Image Compression
("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
("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 ... -
Three Fuzzy Reasoning Models as a Decisionsuport AID, to Find an Electrical Energy Tariff
("Dunarea de Jos" University of Galati, 2005)This contribution is a laboratory-work developed as an example of approximate (fuzzy) reasoning for students, possible to be used as a decision – support to estimate an electrical energy (EE) price for consumers. The three ... -
The Distribution of the Electricfield and of the Current Density in Casa of Electrocorrosion Countermeasures Using the Sacrifice Anodes Technique
("Dunarea de Jos" University of Galati, 2005)An electric field oriented from sea water towards the ship, can develop an extraction work. The corrosion process was thus diminished, by a change in the ship’s hull mass, due to a continuous tore of the material from its ... -
The Influence of Electric Transformers' Specific Parameters Modification on Power Distributions and on Technological Appropriate Consumption (TAC) Within the Energetic System
(The Annals of "Dunarea de Jos" University of Galati, 2005)The paper deals with a comparative analysis – using DINIS(E) programming environment – of the way electric transformers' specific variables (Iron losses, the parameters of the equivalent scheme, the level of primary power ...
