Scientific papers - Annals of "Dunarea de Jos" University of Galati - Analele științifice ale Universității "Dunărea de Jos" din Galați: Recent submissions
Afișează articolele 1261-1280 of 1845
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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 ... -
Classification Process in a Text Document Recommender System
("Dunarea de Jos" University of Galati, 2005)This paper presents the classification process in a recommender system used for textual documents taken especially from web. The system uses in the classification process a combination of content filters, event filters and ... -
A Survey Text Clustering Techniques Used for Web Mining
("Dunarea de Jos" of Galati, 2005)This paper contains an overview of basic formulations and approaches to clustering. Then it presents two important clustering paradigms: a bottom-up agglomerative technique, which collects similar documents into larger and ... -
Fuzzy Queries in Romanian Language. An Intelligent Interface
("Dunarea de Jos" University of Galati, 2005)The most accessible interfaces querying databases must be so intelligent, able to understand natural language expressions and including vague terms in selection criteria. The paper proposes a general architecture for a ... -
A Novel Feature Extraction Method for Isolated Word Recognition Based on Nested Temporal Averaging
("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 ... -
Optimal Coding for Qualitative Sources on Noiseless Channels
("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 ... -
Minimizing the Error Tracking of Mobile Terminals by Kalman Filtering
(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. -
Fuzzy Queries in Romanian Language. An Intelligent Interface
(The Annals of "Dunarea de Jos" University of Galati, 2005)The most accessible interfaces querying databases must be so intelligent, able to understand natural language expressions and including vague terms in selection criteria. The paper proposes a general architecture for a ... -
Relative Aggregation Operator in Database Fuzzy Querying
("Dunarea de Jos" University of Galati, 2005)Fuzzy selection criteria querying relational databases include vague terms; they usually refer linguistic values form the attribute linguistic domains, defined as fuzzy sets. Generally, when a vague query is processed, the ... -
On the Applicability of State-of-the-Art Fault Diagnosis Methodologies to Simple and Complex Systems
("Dunarea de Jos" University of Galati, 2010)This paper performs an analysis on the applicability of state-of-the-art fault diagnosis methodologies to both simple and complex systems. Here, a complex system represents a system whose global behavior, which emerges ... -
Uncertainty Management Using Bayesian Networks in Student Knowledge Diagnosis
("Dunarea de Jos" University of Galati, 2005)In intelligent tutoring systems, student or user modeling implies dealing with imperfect and uncertain knowledge. One of the artificial intelligence techniques used for uncertainty management is that of Bayesian networks. ... -
Active Power Compensator of the Current Harmonics Based on the Instantaneous Power Theory
("Dunarea de Jos" University of Galati, 2005)The quality of the electrical current becomes a major concern. The proliferation of the power electronic converters, which are used extensively to control electrical apparatus in industrial and commercial applications (dc ...
