The Annals of the "Stefan cel Mare" University Electrical Section ISSN 1222-4316 - No. 14 / 2000
Journal of the Faculty of Electrical Engineering
Topics: computers science, control systems, electronics, electrotechnics, drive systems
Copyright © 2000 Faculty of Electrical
Engineering “Stefan cel Mare” University of Suceava, Romania. All rights
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[TABLE OF CONTENTS] [Issues on Internet] [DISTRIBUTION NETWORK][EDITORIAL BOARD] [(e)MAIL]
AIMS AND SCOPE
The Annals of the “Stefan cel Mare“ University of Suceava, 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 EU.
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 modelling and design, control of electric drive systems, non-conventional energy conversion, optimisation techniques in electrical power systems, sensors, transducers modelling and design.
| EDITOR |
Adrian GRAUR - Dean
of the Faculty of Electrical Engineering
| ASSOCIATE EDITORS |
Stefan Gh. PENTIUC
- Research Officer of the Faculty of Electrical Engineering
Leon MANDICI - Vice-dean
of the Faculty of Electrical Engineering
Dorel CERNOMAZU
- Professor of the Faculty of Electrical Engineering
| EDITORIAL BOARD |
International
Tudor AMBROS - Technical
University of Chisinau - MOLDAVIA
Jao Paulo BAPTISTA - Instituto
Politecnico do Porto - PORTUGAL
Oleg BREKHOV - Moscow
Aviation Institute - RUSSIA
Christophe CHAILLOU -
Université des Sciences et Technologies de Lille - FRANCE
Luc DE BACKER - Katholieke
Hogeschool Sint-Lieven Gent - BELGIUM
Timoty HALL - University
of Limerick - IRELAND
Ileana HAMBURG - Institute
for Technology Gelsenkirchen - GERMANY
Maria G. IOANNIDES - National
Technical University of Athens - GREECE
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
Vladimir MESYURA - State
Technical University of Vinnitsa - UKRAINE
John MILNER - City University
London - GREAT BRITAIN
Jose OLIVEIRA e SA - Instituto
Politecnico do Porto - PORTUGAL
Carine NAESSENS - Katholieke
Hogeschool Sint-Lieven Gent - BELGIUM
Nicola PITRONE - Universita
degli Studi di Catania - ITALIA
Jean Paul SIX - Université
des Sciences et Technologies de Lille - FRANCE
Fedir SOPRONIUC - University
of Cernauti - UKRAINE
Petru TODOS - Technical
University of Chisinau - MOLDAVIA
Bernard TOURSEL - Université
des Sciences et Technologies de Lille – France
National
Dumitru N. ALEXANDRU - Technical
University Iasi
Lorin CANTEMIR - Technical
University Iasi
Mihai CRETU - Technical
University Iasi
Stefan HOLBAN - “Politehnica”
University Timisoara
Ioan JURCA - “Politehnica”
University Timisoara
Petru LEONTE - Technical
University Iasi
Ioan LETIA - Technical
University Cluj-Napoca
Radu MUNTEANU - Technical
University Cluj-Napoca
Costica NITU - “Politehnica”
University Bucuresti
Adrian PETRESCU - “Politehnica”
University Bucuresti
Mircea PETRESCU - “Politehnica”
University Bucuresti
Alexandru VALACHI - Technical
University Iasi
The Annals of the "Stefan
cel Mare" University Electrical Section,
ISSN 1222-4316, No. 14 / 2000
TABLE OF CONTENTS
| FEE Info Adrian GRAUR |
|
| A Service Platform for Internet-Telecom Services using SIP Sandford BESSLER, Karl PETERBAUER, Rudolf PAILER, Johannes STADLER |
|
| Combined Methods of the Convertings Errors Correction Of Elements Parameters in the Closed Electric Circuits Alexandr ROIK, Igor ARSENYUK, Vladimir MESYURA |
|
| Management of Web-based Learning
Projects Oleg CERNIAN, Ileana HAMBURG
Gheorghe MARIAN |
|
| Some Aspects of Microwave Drying Akbar K. HAGHI |
|
| Distributed Consensus in Synchronous Networks Cosmin DANCIU |
|
| Field Orientated Control of 3-Phase AC-Motors Irinel - Valentin PLETEA, Dimitrie ALEXA, Iulian RĂDUCANU |
|
| Using PWM Output as a D/A
Converter on a DSP Irinel -Valentin PLETEA, Dimitrie ALEXA,
Adriana SÎRBU, Alexandru LAZĂR |
|
| Hypertrees and K-Bounded Hypergraphs Călin OANEA |
|
| Common Open Policy Service in Comunications Security Iulian CORDUNEANU |
|
Between the 15th and the 20th of May 2000, the Faculty of Electrical Engineering organized the Seventh Annual Students’ International Computers Contest
HARD & SOFT Suceava 2000
The aim of the contest was to design and construct a vehicle that could automatically follow a path defined by four different infra-red sources. The vehicle consisted of a pair of geared dc motors which provided propulsion and steering, a directional infra-red sensor to monitor the I-R source, a Analog Devices DSP card to process and analyze the I-R signals and a motor card to provide adequate power for the motors.
The President of the Jury Committee was Prof. John MILNER (from City University, London), who was assisted by:
- Prof. Oleg BREKHOV from Moscow Aviation Institute
- Prof. Jean Michel DUTHILLEUL from Université des Sciences et Technologies
de Lille
- Lecturer Darius MIKALAUSKAS from City University, London.
The ranking of the participating teams:
1st prize – “Politehnica” University of Bucharest
2nd prize – Technical University of Timisoara
3rd prize – “Stefan cel Mare” University of Suceava.
Next year, our faculty will organize the 8th Edition of the contest,
and welcome representatives from the technical universities in Yugoslavia,
Ukraine, Russia, Moldavia and Romania.
Sandford BESSLER (1), Karl PETERBAUER (1),
Rudolf PAILER(2), Johannes STADLER(3)
(1) Kapsch AG, Pottendorferstrasse 19, A – 1121 Vienna, Austria
{Bessler,Peterbau}@kapsch.net
(2) Ericsson Austria AG, Pottendorferstrasse 25 – 27, A – 1121 Vienna,
Austria Rudolf.Pailer@sea.ericsson.se
(3) Vienna University of Technology, Institute of Communication
Networks, Favoritenstrasse 9 / 388, A – 1040 Vienna, Austria Johannes.Stadler@tuwien.ac.at
Abstract. This paper proposes the introduction of a Service
Platform for the creation, execution and management of multimedia services
in heterogeneous networks. Examining the business-roles, the actors in
the Service Platform are identified. Furthermore several common building
blocks for developing services for the Internet are described and a brief
overview of some modern technologies for an object-oriented, component-based,
distributed platform for multimedia services is given. It is shown that
the Session Initiation Protocol (SIP) is very useful to implement all functions
according to the multimedia part of the Platform. A certain number of use
cases demonstrate the usefulness and the ability of this protocol to introduce
a session concept. By this, we want to cover many important requirements,
which could appear in service platforms with multimedia-oriented goals.
Finally an outlook of open research topics regarding this concept is given
as well as a short overview of related work.
Key words: Service Platforms, SIP, Multimedia Services,
Heterogeneous Networks, Convergence
Alexandr ROIK
Igor ARSENYUK(1)
Vladimir MESYURA(2)
Vinnitsa State Technical University
str. Khmelnitske shosse 95, Vinnitsa, 21021 Ukraine
vimes@vstu.vinnica.ua(2),
air@vstu.vinnica.ua(1)
Abstract. This paper is devoted to the development of the
methods for increasing the accuracy of measuring converter of complex two-poles
in the closed electric circuits. The increase of accuracy is reached at
the expense of correction both amplitude and phase components of converting
errors.
Keywords: in-circuit diagnostics, methods of the diagnostics,
measuring converter, transducer, increase of the transducer accuracy, passive
two-poles.
Oleg CERNIAN
University of Craiova, Computer Science Department,
Craiova, Romania
Oleg.Cernian@comp-craiova.ro
Ileana HAMBURG
Institut Arbeit und Technik Wissenchaftszentrum, Nordrein Westfalen,
Gelsenkirchen, Germany
hamburg@iatge.de
Gheorghe MARIAN
University of Craiova, Computer Science Department,
Craiova,Romania
Gheorghe.Marian@comp-craiova.ro
Abstract. Factors like new demands of knowledge and skills,
economic pressure and greater diversity of further education students,
require new forms of learning and teaching and an adequate management of
projects to introduce such forms. This paper presents an ongoing European
cooperation about the management of Web-based learning projects, including
the development of learning environments for further education. It is based
on experience the project partners gained in this direction within national
and European projects.
Keyword: project management, Web-based learning, virtual
learning environments
Akbar K. HAGHI
University of Guilan
P .O.Box 3756
Rasht. IRAN
Abstract: The microwave drying has been experimentally investigated
on a laboratory scale. The experiments were performed at different levels
of microwave heating power. The kinetic of drying process was studied using
an exponential model Results obtained show a high level of correlation
between applied microwave power and drying rate.
Keywords: Microwave Drying, Exponential Model, Microwave
Power.
Cosmin DANCIU
IT Department, ROMTELECOM
Bd. Eroilor nr. 23, RO-2200 Brasov
cdanciu@romtelecom.ro
Abstract. Consensus reaching is a fundamental issue in the
field of distributed systems; having a consensus reaching strategy helps
solving problems like leader election or the committing of distributed
transactions, which turn out to be of great use in building of reliable,
fail-safe distributed systems. We examine two cases where specific types
of failures are allowed within the network: link failures and process failures.
Keywords: distributed consensus, fault tolerance, fail-safe
distributed systems, synchronous networks
Irinel - Valentin PLETEA (1), Dimitrie ALEXA(2)
and Iulian RĂDUCANU(3)
(1), (2) Technical University of Iasi Faculty of Electronics
and Telecommunications
(3) "Gr.T.Popa" University of Medicine and Pharmacy, Iasi,
Medical Bioengineering Faculty
blv. Carol I RO – 6600 IASI
ivpletea@etc.tuiasi.ro
Abstract: The principle of vector control of electrical drives
is based on the control of both the magnitude and the phase of each phase
current and voltage. For as long as this type of control considers the
three-phase system as three independent systems the control will remain
analog and thus present several drawbacks. The most common of these accurate
vector controls is presented in this document: the Field Orientated Control,
a digital implementation which demonstrates the capability of performing
direct torque control, of handling system limitations and of achieving
higher power conversion efficiency.
Keywords: Field Oriented Control (FOC), Pulse With Modulation
(PWM), Space Vector Pulse With Modulation (SVPWM).
Irinel -Valentin PLETEA (1), Dimitrie ALEXA
(2), Adriana SÎRBU (3) and Alexandru
LAZĂR (4)
(1), (2), (3), (4) Technical University
of Iasi Faculty of Electronics and Telecommunications
blv. Carol I, RO-6600, IASI
ivpletea@etc.tuiasi.ro
Abstract: This paper presents a method for utilizing the on-chip
PWM generators on a TMS320Cx DSP for digital-to-analog (D/A) conversion.
The method involves analog low-pass filtering the PWM signal to remove
high frequency components, leaving only the low-frequency content. Theoretical
and experimental results are presented to quantify the achievable bit resolution.
In addition, analog low-pass filter design is discussed and an example
3 rd order filter design is given. The achievable D/A bandwidth is on the
order of 500 to 1000 Hz. Such bandwidth is useful for real-time system
debug purposes, and also suitable in less demanding applications such as
low performance servo control or man-machine interfacing.
Keywords: PWM, DSP, low-pass filtering.
Călin OANEA
"Stefan cel Mare" University of Suceava
str.Universitatii nr.1, RO-5800 Suceava
oanea@eed.usv.ro
Abstract. In Section 1 we recall some basic concepts from
hypergraph theory. The relevant definitions and facts about hypertrees
are given in Section 2. Some important results and conjectures about k-bounded
hypergraphs are discussed in Section 3.
Keywords: hypertrees, k-bounded hypergraphs, k-uniform hypergraphs,
conjectures
Iulian Corduneanu
"Stefan cel Mare" University of Suceava
str. Universitatii nr.1, RO-5800 Suceava
iulianc@eed.usv..ro
Abstract. This document describes the use of the Common
Open Policy Service (COPS) protocol for support of policy provisioning
(COPS-PR ) in technical security systems. This specification is independent
of the type of policy being provisioned (Security, etc.) but focuses on
the mechanisms and conventions used to communicate provisioned information
between Policy Decision Points and Policy Enforcement Point. The protocol
extensions described in this document do not make any assumptions about
the policy data model being communicated, but describe the message formats
and objects that carry the modeled policy data.
Keywords: Protocol, Common Open Policy Service, Policy Information
Base, Request, Decision, Report State.
The Annals
of the "Stefan cel Mare" University Electrical
Section, ISSN
1222-4316, No. 14 / 2000
DISTRIBUTION NETWORK
The issues of the journal are distributed in 22 University Libraries from Belgium, France, Germany, Great Britain, Greece, Italy, Moldavia, Portugal, Romania, Russia, Ukraine and USA
| Universite des Sciences et Technologies de
Lille
Bibliotheque Universitaire Centrale Cite Scientifique Av. Henri Poincaré BP155 59653 Villeneuve d’Ascq Cedex FRANCE |
Universitatea Tehnica a Moldovei
Biblioteca universitara Bd. Stefan cel Mare 168 277012 CHISINAU Republica Moldova |
| Laboratoire Informatique de Lille
Bibliotheque Batiment M4 Cite Scientifique 59655 Villeneuve d’Ascq Cedex FRANCE |
University of Cernautzi
University Library Ul. Kocjubinskogo 2 274012 CERNOVCY UKRAINE |
| L2EP E.C. Lille
Batiment P2 Cite Scientifique BP 48 59655 Villeneuve d’Ascq Cedex FRANCE |
The State Technical University of Vinnitsa
University Library 95, Khmelnitska shore 286021 VINITSA UKRAINE |
| KAHO Katholieke Hogeschool Sint-Lieven Gent
Gebroeders Desmetstraat 1 B-9000 GENT BELGIUM |
Moscow Aviation Institute
Library Volo Kolamskoye chosse 4 125 871 MOSCOW RUSSIA |
| Universita degli Studii di Catania
Dipartimento Elettrico Elettronico e Sistemistico V.le A.Doria, 6 95125 CATANIA ITALY |
Moscow Institute of Radioengineering and Electronics
Institute Library Pr. Vernadskogo 78 117 454 MOSCOW V454 RUSSIA |
| Instituto Superior de Engenharia do Porto
(ISEP)
Biblioteca (Library) Rua S. Tome 4200 PORTO PORTUGAL |
CITY UNIVERSITY
University Library Northampton Square LONDON EC1V 0HB GREAT BRITAIN |
| Universite de Franche Comte
Bibliotheque Universitaire 30, Avenue de l’Observatoire 25030 BESANCON Cedex Belfort FRANCE |
University of Colorado
University Library COLORADO SPRING 1420 Austin Bluffs Pkwy CO 80907 USA |
| Texas Cristian University
University Library BOX 32886, FORT WORTH 76 129 Texas USA |
National Technical University of Athens
University Library ZOGRAPHON ATHENS 15773 GREECE |
| Universitatea Tehnica "Gh. Asachi" Iasi
Biblioteca universitara 6600 IASI |
Universitatea Tehnica Cluj-Napoca
Biblioteca universitara 26, G.Baritiu RO-3400 CLUJ- NAPOCA |
| Universitatea Tehnica din Timisoara
Biblioteca universitara TIMISOARA |
Biblioteca Centrala Universitara
IASI |
| Universitatea din Craiova
Biblioteca universitara CRAIOVA |
Biblioteca Centrala Universitara
CLUJ - NAPOCA |
Subscription and Paper Submission
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