Annals of the University "Dunarea de Jos" of Galati. Fascicle III: Electrotechnics, Electronics, Automation Control and Informatics: Recent submissions

Afișează articolele 41-60 of 230

    • 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 ...

    • A RLS Model Extracted by ICA 

      Colţuc, Daniela; Ilie, Mihaela; Merlan, Andreea ("Dunarea de Jos" University of Galati, 2007)
      This paper presents some preliminary results regarding the ability of ICA in analyzing spectrometric data. A set of RLS spectra, measured for different concentration DNA solutions, in the presence of the probe TbDTPA, is ...

    • Computing Negentropy Based Signatures for Texture Recognition 

      Lungu, Ana-Elena; Colţuc, Daniela; Frângu, Laurenţiu (2007)
      The proposed method aims to provide a new tool for texture recognition. For this purpose, a set of texture samples are decomposed by using the FastICA algorithm and characterized by a negentropy based signature. In order ...

    • Vector Space Model for Document Representation in Information Retrieval 

      Munteanu, Dan ("Dunarea de Jos" University of Galati, 2007)
      This paper presents the basics of information retrieval: the vector space model for document representation with Boolean and term weighted models, ranking methods based on the cosine factor and evaluation measures: recall, ...

    • A Quick Survey of Text Categorization Algorithms 

      Munteanu, Dan ("Dunarea de Jos" University of Galati, 2007)
      this paper contains an overview of basic formulations and approaches to text classification. This paper surveys the algorithms used in text categorization: handcrafted rules, decision trees, decision rules, on-line learning, ...

    • Knowledge Based Diagnostic System With Probabilistic Approach 

      Cocu, Adina ("Dunarea de Jos" University of Galati, 2007)
      This paper presents a knowledge learning diagnostic approach implemented in an educational system. Probabilistic inference is used here to diagnose knowledge understanding level and to reason about probable cause of learner’s ...

    • Automatic Modeling of the Linguistic Values for Database Fuzzy Querying 

      Tudorie, Cornelia; Frângu, Laurenţiu; Ştefănescu, Diana ("Dunare de Jos" University of Galati, 2007)
      In order to evaluate vague queries, each linguistic term is considered according to its fuzzy model. Usually, the linguistic terms are defined as fuzzy sets, during a classical knowledge acquisition off-line process. But ...

    • Automatic Modeling of the Linguistic Values for Database Fuzzy Querying 

      Tudorie, Cornelia; Frângu, Laurenţiu; Ştefănescu, Diana (2007)
      In order to evaluate vague queries, each linguistic term is considered according to its fuzzy model. Usually, the linguistic terms are defined as fuzzy sets, during a classical knowledge acquisition off-line process. But ...

    • A New Approach to E-Commerce Multi-Agent Systems 

      Jascanu, Nicolae; Jascanu, Veronica; Nicolau, Florin ("Dunarea de Jos" University of Galati, 2007)
      The negotiation process between two humans is an art. To capture the magic behind negotiation, a first step will be to build a model that incorporates human emotions and community emotional opinions. A model like this will ...

    • A Student Model in a Multi-Agent Intelligent System 

      Novac – Ududec, Cornelia; Birla, Rodica ("Dunarea de Jos" University of Galati, 2007)
      The paper presents an intelligent tutoring system which provides a Student Model using the “overlay method”. The system’s tasks are distributed among the intelligent agents (software agents), each having clearly specified ...