Advances in Electrical and Computer Engineering
ISSN 1582-7445 - No 2 / 2001

Advances in Electrical and Computer Engineering, the Electrical Section is the scientific official journal of the Faculty of Electrical Engineering.

The publication policy is to publish high quality original scientific articles and reviews with permission from the Editorial Board. The authors must translate themselves their articles into a foreign language accepted by the UE. It should not have been previously publish and should not be under consideration for publication elsewhere.

The scope of the journal covers: computers science, artificial intelligence, pattern recognition, knowledge engineering, process control theory and applications, distributed systems and computer networks, microcontroller - based industrial networks, electronics, telecommunications, data transmission, software engineering, energy converters, electrotechnics, electric machines modeling and design, control of electric drive systems, non-conventional energy conversion, optimization techniques in electrical power systems, sensors, transducers modeling and design.
 
 

All rights reserved. No part of this publication may be reproduced, stored in a retrieval system, photocopied, recorded or other wise, without written permission from the editor.

When authors submit their papers for publication, they agree that the copyright for their article be transferred to the Faculty of Electrical Engineering, the "Stefan cel Mare" University of Suceava, Romania, if and only if the articles are accepted for publication. The copyright covers the exclusive rights to reproduce and distribute the article, including reprints and translations.

Permission for other use. The copyright owner’s consent does not extend to copying for general distribution, for promotion, for creating new works, or for resale. Specific written permission must be obtained from the Editor for such copying.

Disclaimer. Whilst every effort is made by the publishers and editorial board to see that no inaccurate or misleading data, opinion or statement appear in this journal, they wish to make it clear that the data and opinions appearing in the articles, as well as linguistic accuracy, are the sole responsibility of the author.

   EDITOR

  Adrian GRAUR   - Dean of the Faculty of Electrical Engineering
 
     ASSOCIATE  EDITORS

  Ştefan Gh. PENTIUC  - Scientific Secretary of the Faculty of Electrical Engineering
  Leon MANDICI   - Head of the Electrotechnique Dept.,Faculty of Electrical Engineering
  Dorel CERNOMAZU  - Faculty of Electrical Engineering
 
     EDITORIAL  BOARD

 Tudor AMBROS   - Chişinău Polytechnical Institute - MOLDAVIA
 Dumitru N. ALEXANDRU   - Technical University Iasi
 Jao Paulo BAPTISTA   - Instituto Politecnico do Porto - PORTUGAL
 Oleg BREKHOV   - Moscow Aviation Institute - RUSSIA
 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 Limerich - 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
 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
 Petru LEONTE   - Technical University Iaşi
 Ioan LETIA   - Technical University Cluj-Napoca
 Vladimir 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
 Carine NAESSENS  - Katholieke Hogeschool Sint-Lieven Gent - BELGIUM
 Costică NITU   - University Politehnica Bucureşti
 Adrian PETRESCU   - University Politehnica Bucureşti
 Mircea PETRESCU  - University Politehnica Bucureşti
 Nicola PITRONE  - Universita degli Studi Catania - ITALIA
 Jean Paul SIX   - Université des Sciences et Technologies de Lille - FRANCE
 Fedir SOPRONIUC   - University of Cernăuţi - UKRAINE
 Petru TODOS   - Technical University of Chisinau - MOLDAVIA
 Bernard TOURSEL   - Université des Sciences et Technologies de Lille - FRANCE
 Alexandru VALACHI  - Technical University Iaşi
 

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FEE Info
 

Two academic events took the limelight of the much-awaited 2001:
 

• The 8th edition of the Fire Fighting Home Robot Contest organized in April by Trinity College, U.S.A.

The goal of the contest was to build a computerized (not radio-controlled) Robotic device capable of moving through a   249cm by 249cm model house with only one floor, detecting a lit candle and putting it out. Robots that consistently accomplished this task in the shortest time won. No restrictions were imposed on the weight of the Robot and the types of materials employed in its construction. The contest entrants could enroll in one of the following divisions: Expert, Senior, High School and Junior.
The Faculty of Electrical Engineering in Suceava was represented by a 3-student team in the Senior Division: George HOLCA, Andrei Coriolan LEONTE and Dorin PALANCIUC, all 4-year students in Computer Engineering, formed the only European participating team and managed to occupy the 13th place out of 68 teams from all over the world (15 of them were disqualified at the pre-selection stage). The score obtained by the Romanian team was of 36.78 points.

•  The 8th edition of the mid-May Hard & Soft Annual International Students’ Contest organized by the Faculty of Electrical Engineering in Suceava.

The 10 participating teams were required to use image processing and pattern recognition in order to control the movements of a robot on an area of 6 square meters and make it visit 4 stations in a specified order.
The president of the jury committee was Professor John MILNER (from City University, London) assisted by:

•  Assoc. Prof. John HILL (City University, London)
•  Lecturer Darius MIKALAUSKAS (City University, London)
• Assoc. Prof. Laurent GRISONI (EUDIL, Lille)

1st prize – The “Transilvania” University of Braşov
2nd prize – The Technical University of Iaşi
3rd prize – The “Ştefan cel Mare” University of Suceava

           Adrian GRAUR
    Dean of the Faculty of the Electrical Engineering

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DISTANCE LEARNING APPROACHES: AN EXAMPLE OF APPLICATION FOR DISABLED STUDENTS
 

Ileana HAMBURG
Institut Arbeit und Technik Wissenchaftszentrum, Nordrein Westfalen,
Gelsenkirchen, Germany, hamburg@iatge.de
Steffi ENGERT
SOKOM Internetprojekte GmbH
Köln, Germany, sokom@t-online.de
Mihnea MARIN
Colegiul Turnu Severin, Universitatea Craiova
Craiova,Romania, mihmarin@central.ucv.ro
 

Abstract. In this paper, after a brief presentation of distance learning particularly by using the Interne  and of some approaches for distance learning to realise a progressive implementation of it in education and training we give an example of a German-Romanian cooperation for improving the qualification of disabled students in Romania by using such approaches.
Keyword: distance learning, Inetrnet, disabled

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ROBUST SIMILAR DISTRIBUTED SYSTEM FOR CONTROL
OF TECHNOLOGICAL PROCESSES IN REAL TIME
 

Victor ABABII, Viorica SUDACEVSCHI
Technical University of Moldova,
Computer Sciences Department,
Stefan cel Mare, 168, Chisinau,
Republic of Moldova
ababii@mail.utm.md
 

 Abstract. In work "Robust similar distributed system for control of technological processes in real time" is examined synthesis and analysis of a similar distributed multiprocessor control system capable to reveal and to eliminate single and constant errors. Are submitted algorithm of revealing and elimination of malfunctions in control elements and algorithms of revealing and elimination of errors in parameters of a vector of identification of a condition of technological process and vector of a condition of technological process. An estimation of productivity of the distributed multiprocessor control system of technological processes in real time is resulted.
Keywords: distributed system control, distributed algorithms, distribution of an error, error of control.
 

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AVAILABILITY OF FLEXIBLE MANUFACTURING CELLS
 

Călin CIUFUDEAN
calin@eed.usv.ro
George MAHALU
mahalu@eed.usv.ro

"Stefan cel Mare" University of Suceava
str.Universitatii nr.1, RO-5800 Suceava
 

Abstract. This paper presents an analytical approach for the availability evaluation of flexible manufacturing cells (FMC). We define availability measures in conditions when a manufacturing system is considered operational as long as its production capacity requirements are satisfied. The advantage of the approach is that constructing a system level Markov chain is not required. A manufacturing system is decomposed into manufacturing cells. For each manufacturing cell a Markovian model is derived and solved to find the probability of a subset of working machines in each cell, and a subset of the operating material handling carriers that satisfies the manufacturing capacity requirements.
Key-words. Availability, manufacturing cells, Markov chains, state process, task analysis.

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PARTIAL DISCHARGE TESTS WITH PATTERN RECOGNITION,
IN SUPPORT OF ELECTRICAL INSULATION QUALITY

Romeo CIOBANU*, Cristina SCHREINER*,                    Wolfgang PFEIFFER**
* "Gh. Asachi" Technical University of Iaşi                               **Darmstadt University of Technology
 Bd. D. mangeron no.53, RO-6600 Iaşi                                      Landgraf-Georg-Str. 4, D-64283 Darmstadt
 Romania, rciobanu@ee.tuiasi.ro                                               Germany, wpfeiffr@hrz1.hrz.tu-darmstadt.de

Abstract. This paper is a brief example of the new vision upon the use of PD measurements in support of insulating systems quality. The advanced PD testing techniques are now provided with specialised functions for pattern recognition and statistical identification of failure mechanisms, supported by specialised software.
Keywords: partial discharges, pattern recognition, insulation systems, quality assessment.

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PETRI NET REPRESENTATION OF SHUNTING OPERATIONS
 
 
 

Călin CIUFUDEAN           George MAHALU                  Gabriel ANASTASIU
University of Suceava         University of Suceava               University of Suceava
calin@eed.usv.ro             mahalu@eed.usv.ro                agabriel@eed.usv.ro
 

Abstract. This paper presents an approach to assembly sequence planning problem based on Petri nets representation. Assembly planning is an important step in the design-execution conversion process. In practice it is important to generate plans that can be successfully completed using the availability assembly cell. Here, we discuss how hierarchical nature of assembly is modeled by Petri nets for to represent assembly plans and respective control plans. An illustrative example was chosen from the sorting operations in railway systems.
Keywords: assembly plan, assembly Petri net, sorting operations, railway.
 

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HYBRID STOCHASTIC PETRI NETS FOR THE DISCRETE-CONTINUOUS MODELING AND PERFORMANCE EVALUATION OF COMPUTERS SYSTEMS
 

Emilian GUŢULEAC, Vasile GÎSCA, Sergiu ZAPOROJAN, Nicolae OBJELEAN
Computer Science Department, Tehnical University of Moldova
Bul. Stefan cel Mare nr. 168, MD-2012 Chisinau, R. Moldova
gutuleac@mail.utm.md, gasca@mail.utm.md, s_zaporojan@mail.utm.md
 

Abstract. We present second order Hybrid Stochastic Petri Nets (HSPNs) that can be used for modeling dynamic systems that com-prise both discrete and continuous quantities. Discrete state changes are assumed to the Markovian process and continuous variables are assumed to be random diffusion process. This is achieved by the introduction of a new class of continuous place and continuous transition by a re-formulation of the enabling and firing rules. By utilizing specific numerical solution technique on an approx-imation of the first order HSPNs using a discrete-state stochastic process, from which a continuous-time Markov chain (CTMC) can be derived. We present one example to demonstrate the enhancements contained in new formalism for the modeling and performance evaluation of computers systems.
Keywords: hybrid stochastic Petri nets, discrete-continuous modeling, performance evaluation.
 

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VPNP – SOFTWARE TOOL FOR MODELLING AND PERFORMANCE EVALUATION USING GENERALISED STOCHASTIC PETRI NETS
 

Emilian GUŢULEAC,  Constantin BOŞNEAGA,  Andrei REILEAN
Technical University of Moldova, Computer Science Department,
Bd. Ştefan cel Mare, nr. 168, MD-2012, Chişinău, Moldova
gutuleac@mail.utm.md, reilean@moldovacc.md,Constantin.Bosneaga@riscom.net
 

Abstract. Petri nets are a formal tool very well suited to the description of distributed and concurrent systems which exhibit synchronization and contention for shared resources. Adding random temporal specifications to Petri nets, stochastic Petri nets are obtained from which event driven simulators can be automatically constructed. This paper describes the software tool VPNP for the modeling and performability evaluation of the technical system using generalized stochastic Petri nets. A modeling tool that has been developed for these purposes is illustrated with an emphasis on the modeling environment it provides and on its internal software architecture.
Keywords: software tool, modeling, performance evaluation, stochastic, Petri nets.
 

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FEATURES AND OPPORTUNITIES OF COMMAND - INFORMATION LAN
 

Oleg NICOLAICIUC, Emilian GUŢULEAC, Vasile GÎSCĂ, Sergiu ZAPOROJAN
Technical University of MOLDOVA,
 Bl. Stefan cel Mare, 168, MD-2012, Chisinau, MOLDOVA
onic@ch.moldpac.md, gutuleac@mail.utm.md, gasca@mail.utm.md, s_zaporojan@mail.utm.md
 

Abstract. This work is dedicated to features and opportunities of the Command-Information LAN (CI LAN), which are widely applied for automation systems of manufacturing and research. The major factors which have resulted in creation of the Command-Information LAN, their structures, and basic performances are described.
Keywords: Command-Informational LAN (CI LAN).

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TEST-BENCHES FOR ELECTROMECHANICAL SYSTEMS,
BASED ON VIRTUAL INSTRUMENTATION
 

Cristina SCHREINER,  Romeo CIOBANU,  Mihai CRETU,  Bogdan BARABOI
"Gh. Asachi" Technical University of Iasi
Bd. D. Mangeron no.53, RO-6600 Iaşi
cschrein@ee.tuiasi.ro
 

Abstract. The research was focussed on the development of a general test-bench configuration, in order to facilitate effectively the on-line monitoring of the tested electromechanical systems, by use of a virtual instrumentation platform, designed and implemented via LabVIEW graphical programming language. This kind of test-benches may be optionally designed to predict the movement characteristics, perform failure diagnosis and determine the exploitation limits, using the experimental information derived from the continuous analysis of the control parameters, by use of a specialised multisensor platform with ANN support.
Keywords: test-benches, virtual instrumentation, multisensor platform, electromechanical transport systems.
 

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THE MATHEMATICAL CALCULATION OF THE INVERSE OF THE GENERALIZED INDUCTANCE MATRIX  OF THE MODEL OF THE INDUCTION MOTOR IN THREE PHASE FRAME
 

Cătălin ŢIGĂERU
“Stefan cel Mare” University of Suceava
str.Universitatii no.1,RO-5800 Suceava
tigaeru@assist.ro

 Abstract.The mathematical analysis of transitory phenomena in induction machines needs the elaboration of some models described by a system of differential equations. In order to solve this system it is necessary to determine the literally form of the inverse of the so-called generalised inductance matrix. In this paper we determine the inverse of this matrix.
 Keywords: the transpose of the matrix, the cellular decomposition.

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FAULT DIAGNOSIS AND CONSUMPTION PROGNOSIS IN ELECTRICAL POWER SYSTEMS USING ARTIFICIAL NEURAL NETWORKS
 

Ştefan-Gheorghe PENTIUC
"Stefan cel Mare" University of Suceava
str.Universitatii nr.1, Suceava, pentiuc@eed.usv.ro
Dragoş Mircea DANUBIANU
Suceava County Council
str. Stefan cel Mare nr.36, Suceava, ddanub@consiliu.suceava.ro
 

Abstract. The aim of the paper is to present a learning technique for an intelligent system, based on Artificial Neural Network, with applications in the supervising and control of the electrical power systems.
The supervising of the power network is achieved with a process computer network that transmits to the control centre the values of the parameters measured in power posts and the alarms during a fault in the power transport network. A prognosis with ANN of the horary city power consumption is also presented.
Keywords: pattern recognition, artificial neural network, power consumption prognosis

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EXTENDING THE INFORMATION WAREHOUSE FRAMEWORK WITH DATA MINING

Mirela DANUBIANU
SC ACET S.A. Suceava
Str. M. Eminescu, nr. 5
acet@warpnet.ro

Dragos Mircea DANUBIANU
Suceava County Council
ddanub@countycouncil.suceava.ro
 

Abstract. Competitive business pressures and a desire to leverage existing information technology investments have led many firms to explore the benefits of data mining technology. This technology is designed to help businesses discover hidden patterns in their data -- patterns that can help them understand the purchasing behavior of their key customers, detect likely credit card or insurance fraud, predict probable changes in financial markets, etc...
These pages explore data mining, and its potential benefits to users. It also explains how data mining activities can be integrated within an existing user environment, including those activities that already make use of data warehousing.
 

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Advances in Electrical and Computer Engineering

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Mail
prof. Adrian GRAUR
Faculty of Electrical Engineering
The "Stefan cel Mare" University of Suceava,
str.Universitatii nr.1
RO-5800 SUCEAVA
Romania

e-mail:  adriang@eed.usv.ro

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