Advances in Electrical and Computer Engineering
ISSN 1582-7445 - No 2 / 2005

EDITOR

  Adrian GRAUR   - Faculty of Electrical Engineering
 
 

ASSOCIATE  EDITORS

  Ştefan Gh. PENTIUC  - Faculty of Electrical Engineering
  Leon MANDICI   -  Faculty of Electrical Engineering
  Dorel CERNOMAZU  - Faculty of Electrical Engineering
 
 

EDITORIAL  BOARD

 Tudor AMBROS   - Technical University of Chişinău - MOLDAVIA
 Dumitru N. ALEXANDRU   - Technical University Iasi
 Oleg BREKHOV   - Moscow Aviation Institute - RUSSIA
 Mihai CERNAT - "Transilvania" University Brasov
 Cristophe CHAILLOU   - Universite des Sciences et Technologies de Lille - FRANCE
 Mihai CRETU   - Technical University Iaşi
 Luc DE BACKER   - Katholieke Hogeschool Sint-Lieven Gent - BELGIUM
 Timothy HALL   - University of Limerick - IRELAND
 Ileana HAMBURG   -Institute for Technology Gelsenkirchen - GERMANY
 Stefan HOLBAN   - "Politehnica" University Timisoara
 Maria G. IOANNIDES   - National Technical University of Athens - GREECE
 Ioan JURCA   - "Politehnica" University Timisoara
 Vladimir KATIC  - University of Novi Sad - SERBIA AND MONTENEGRO
 Eleftherios A. KAYAFAS   - National Technical University of Athens - GREECE
 Mykola KIRICHENKO   - Institute of Cybernetics Kiev - UKRAINE
 Valeriu KRAPIVIN   - Moscow Institute of Radioengineering and ELectronics - RUSSIA
 Ioan LETIA   - Technical University Cluj-Napoca
 Volodymyr MESYURA   - The State Technical University of Vinnitsa - UKRAINE
 John MILNER   - City University London - GREAT BRITAIN
 Radu MUNTEANU  - Technical University Cluj-Napoca
 Jose OLIVEIRA e SA  - Instituto Politecnico do Porto - PORTUGAL
 Costică NITU   - "Politehnica" University Bucureşti
 Adrian PETRESCU   - "Politehnica" University Bucureşti
 Mircea PETRESCU  - "Politehnica" University Bucureşti
 Nicola PITRONE  - Universita degli Studi Catania - ITALIA
 Radu Emil PRECUP - "Politehnica" University Timisoara
 Jean Paul SIX   - Université des Sciences et Technologies de Lille - FRANCE
 Fedir SOPRONIUC   - University of Cernăuţi - UKRAINE
 Mircea STRATULAT  - "Politehnica" University Timisoara
 Gavril TODEREAN - Technical University Cluj-Napoca
 Petru TODOS   - Technical University of Chisinau - MOLDAVIA
 Bernard TOURSEL   - Université des Sciences et Technologies de Lille - FRANCE
 
 

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FEE INFO

        In the first edition of the Romanian Electrotechnics Week (19th-24th September 2005), the Faculty has organized and hosted two scientific manifestations:

• THE SYMPOSIUM OF UNCONVENTIONAL ELECTRICAL MACHINES– ELS 2005
• THE EXHIBITION OF INVENTICS 2005

        In the same week we celebrated 20 YEARS OF HIGHER EDUCATION OF ELECTRICAL PROFILE IN SUCEAVA, as it was in the academic year 1985 - 1986 that the specialisation of Industrial Energetics was born, the first of the electrical specializations to be created in Suceava.

        The third edition of the Symposium of Unconventional Electrical Machines took place between the 22nd – 23rd of September 2005. In the framework of the Symposium, 37 scientific works were presented, grouped in 3 sections:

A. Unconventional Electrical Machines – 21 papers
B. Unconventional Energy Conversion Systems – 10 papers
C.  Small Power Electrical Drives– 6 papers.

        The majority of them (15 works) concerned the conception, the experimental testing  and the theoretical study of several electrical machines such as: solar electrical motors, electrostatic microengines; electrical microvibromotors; unprotected submergible electrical motors, liquid electro - mechanical actuators.
        The works that were presented here are the outcome of the research carried out at the Research Centre of Electrical Machines, Devices and Electrical Drives – EMAD. These works were carried out in the frame of some diploma works, within the research for some PhD theses or as research related to the carrying out of some CNCSIS grants. s of the 2nd section was related to the preoccupations of the teaching staff at the
        The main theme area of the work Suceava University in the field of design, realisation and testing of some small power aeolian and hydraulic aggregates, but especially to those of the representatives of U. T. Moldova of Kishinev, with great experience in the field of aeolian energy valorisation.
        Some remarkable works were the syntheses presented in the field of reduced speed systems of drives with asynchronous linear motors in a hybrid variant or with bilateral inductors with „longitudinally shifted” homologous cuts, as well as some works concerning the vectorial control of electrical drives.

        The second edition of the exhibition of inventics has gathered 80 inventions, 20 of them carried out in 2005. Posters with invention description, medals gained at the international salons (Iasi, Brussels, Geneva) and models carried out in the laboratories of the faculty were displayed in the exhibition. All the exhibited inventions were carried out by the members of the Research Centre in the Field of Electrical Machines, Devices and Electrical Drives, as they were the outcomes of the research made by the teaching staff, by PhD students, Master students and undergraduates.
 
 

Professor Adrian GRAUR

Abstract. Paper deals with quality and reliability of square coils processed by photo-imaging technique on LTCC. LTCC technology offers the construction of square coils suitable for RF and microwave advanced applications with better properties. Examples of a new line structuring method are photo-imaging inks applied on LTCC and in this paper are discussed critical process steps of Fodel® technology from Du Pont. We designed and manufactured many planar and 3D square coils with narrow widths and spaces that offer the possibility to construct the coils under controlled inductance. We tested the quality and reliability of square coils by these tests: damp heat cyclic tests, thermal shocks, accelerated ageing thermal stress. Correlation among electrical properties, ageing and process condition of square coils based on Fodel® technologies were analysed. The results have shown the positive effect of using smaller and more precise lines based on Fodel.

Keywords: coil, LTCC, photo-image inks, Fodel® technology, reliability tests
 
 

Abstract. A novel class of ISI-free pluses is presented and investigated. We propose and investigate a class of new Nyquist pulses that shows comparable or better ISI performance in the presence of sampling errors, as compared with some recently proposed pulses.
Keywords:  intersymbol interference, Nyquist filter, error probability.
 
 

Abstract. Despite perfecting of performances of computers and applied programs the problems of decomposition for high-order stochastic control systems remain actual. This paper presents a decomposition technique for describing a three-rate continuous-time stochastic control system as state-space (SS) models of multi-input/multi-output (MIMO) subsystems. An illustrative example from the aircraft industry – decomposed three–rate control of an aeroelastic MIMO model of 55th order for a modified Boeing B767 airplane at a flutter condition – was carried out using the proposed three-rate SS decomposition technique. The results of decomposition of an original stochastic system on three-rate autonomous subsystems are tested with the help of the block diagrams of functioning for the given original control system with single linear-quadratic-Gaussian (LQG) controller and for three-rate control system with three proportional-integrating (PI) controllers. This example demonstrates that the research technique results in simplified low-order MIMO autonomous subsystems with low-order PI controllers running at different rates and shows the quality of the proposed technique. The simulation results with use of software package Simulink demonstrate that this research technique would work for real-time MIMO high-order stochastic systems.
Keywords: simulation, multi-rate, models, aircraft control.
 
 

Abstract. This paper deals with the construction design of permanent magnet disc motor by classical calculation method.  Design correctness of such method is verified by computer finite element simulation method, which serves for motor magnetic field drawing. Based on both method comparing the inaccuracy of total motor design is stated too.
Keywords: permanent magnet motor, disc motor, electromagnetic motor field simulation.
 
 

Abstract. In this paper we describe the case of a complete data communication beam used in a satellite and space channel. The case of error correction and modulation codes of practical modes are considered. A practical data communication channel is designed and tested in a complete combined system. We use C language or Altera’ s MAX PLUS II VHDL SW to implement a system that  achieves a high rate of performance. Also, we use error protection methods to protect the messages and make the communication reliable and improve the performance of the system by matching the required system characteristics and help to mitigate the problems of EMC channel.
Keywords: Traffic, Flow, Capacity, Routing, Optimization
 
 

Abstract. This paper provides an in-depth analysis of the new Java language feature called Java Generics and its relation to array component types and type covariance. We will explore the design decisions that lead to the actual implementation of the Java Generics and provide some work around solutions to the restrictions that Java Generics impose. We will also identify the source of confusion Java Generics generates among Java programmers related to array component types and type covariance issues.
Keywords: type covariance, Java and design
 
 

Abstract. In this paper a new approach in workflow modelling and control is presented. The main idea consists of Petri nets model implementation using artificial intelligent agents. The main differences from a dedicated agent framework and this approach appear in two points. The agent communications will be restricted at the oriented graph resulted from workflow analysis and the transitions will be in fact made by agents that can have any required complexity. Also the agent interaction can create new rules that will be added into general rule database if the user approves it.
Keywords: workflow, intelligent agents and Petri nets
 
 

Abstract. The resonant inverters are used in the heating installations by induction because have their possibility of compensating for the limited inductive impedance of the inductor. The authors  propose the general outline of the resonant inverter with MOSFET with the advantages of this system. There is also presented a diagram block for the loop of reaction, which forms part of system of adjustment of the inverter. It has the role to maintain unaltered the parameters of operation under the specific conditions. For the checking circuit are given the structure and the elements minimum of projection specify of it the advantage of reacting quickly or change of the parameters of the impedance.
Keywords: resonant inverter, resonant transformer, MOSFET, Bode diagram, control loop.
 
 

Abstract. The article presents the analysis and experimental results for the autonomous inverters with energy dosage used in the induction heating installations. The advantage of these sources of energy is that their output power of exit is set out again clearly, that during operation this one do not depend on the parameters of the load. It remains equal to a specified value. There is presented the diagram block of the converter with proportioning of energy, with two alternatives of inverters: in bridge and half-bridge, and the control circuit with loop of hold of phase. Finally the practical results that are obtained by the authors are presented.
Keywords: autonomous inverter, proportioning of energy, dosage unit, PLL, buckle of fitting on phase, IGBT.
 
 

Abstract. Several considerations with regards to the use of natural gestures for interacting in virtual environments are discussed, taking into account current technologies for gesture acquisition, existing interaction metaphors and the usability, ease of use and advantages/disadvantages of gestures with rapport to other interacting technologies. Discussion is equally conducted on gestures being used for the three main tasks commonly encountered in virtual environments: selection, manipulation and travel. References to gesture definition and classification according to different criteria and their relevance for interacting in virtual environments are equally taken into account.
Keywords: natural gesture, gesture interaction, interaction metaphors, virtual environments.
 
 

Abstract. Macromedia Flash has always been a popular software product to use in creating multimedia applications for learning. It is particularly suitable for creating reusable learning objects which follow the framework set out in the Cisco Reusable Learning Object (RLO) strategy. This paper will examine how flash is moving towards a more open source development strategy by releasing the source code of its flash player, making its compiled Shockwave Flash file format(*.swf) more open. It will also examine how flash developers are becoming increasingly aware of the importance of sharing and reuse. Developers are releasing the source Flash file (*.fla)s of their compiled Shockwave Flash objects under the creative commons licence to facilitate reuse and learning. This will allow learning objects developed in Flash to become more reusable as educational developers can adapt the source code in the original flash file to meet the needs of their students.
Keywords: open source, Cisco Reusable Learning Object, Shockwave Flash, learning objects
 
 

Abstract. The concept of laboratory work for university engineering students implemented through Problem Based Learning is introduced. PBL’s development and its advantages as a teaching and learning methodology are presented. The pedagogical shift needed by both teacher and learner is explained, along with the structuring of a typical PBL based engineering course. Changes in the way student performance can be assessed are explored.
Keywords: teaching model, Problem Based Learning, curriculum design, performance assessment
 
 

organized by Faculty of Electrical Engineering "Stefan cel Mare" University  Suceava, ROMANIA

 The aim of the Conference will be to bring together scientists, engineers, manufacturers and users from all over the world in order to provide and exchange information on recent developments and future trends in:

Papers must be written in English and should not exceed 8 pages.
The editorial board will select the best papers to be published in the Conference Proceedings. Copies will be distributed upon arrival.
 
 

We strongly recommend the submission of papers by directly posting them on the form at http://www.eed.usv.ro/das/register/
Alternatively by regular mail (2 paper copies + disk) to the Conference address:

               Facultatea de Inginerie Electrica, DAS 2006
               Str. Universităţii nr.13
               720229 Suceava, Romania