National
 Lorin CANTEMIR  - Technical University Iaşi
 Mihai CRETU   - Technical University Iaşi
 Ionel HAIDUC   - Technical University Cluj-Napoca
 Ioan JURCA   - University Tehnica Timişoara
 Petru LEONTE   - Technical University Iaşi
 Ioan LETIA   - Technical University Cluj-Napoca
 Radu MUNTEANU  - Technical University Cluj-Napoca
 Costică NITU      - University Politehnica Bucureşti
 Adrian PETRESCU - University Politehnica Bucureşti
 Mircea PETRESCU  - University Politehnica Bucureşti
 Alexandru VALACHI  - Technical University Iaşi
 

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In May 1999 the Faculty of Electrical Engineering organised the Sixth Annual Students' International Computers Contest

The contest consisted in the design and achievement of a system containing hardware and software modules.  The students may use books and other sources, but they are not allowed to use any kind of information in a machine readable form. Only the functional products will be taken into account to be rewarded.
The President of the Jury was Prof. John MILNER, from City University, London. Members of the jury : John HILL, David STYLES, Darius MIKALAUSKAS, all from the City University, London
The ranking of the participating teams :

1^st prize - Technical University of Timisoara
2^nd prize - "Politehnica" University of Bucuresti
3^rd prize - "Stefan cel Mare" University of Suceava
Honourable Mention - University of Craiova, Technical University of Iasi , Technical University of Chisinau

                                         ADRIAN GRAUR
                      Dean of the Faculty of Electrical Engineering

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Maria G. IOANNIDES
National Technical University of Athens
Department of Electrical and Computer Engineering
Heroon Polytechniou 9, 15773, Athens, Greece
E-mail: mioannid@ece.ntua.gr
 

Abstract. This paper presents the implementation of a programmable logic controller based closed loop control system for an induction motor drive. Also, it describes the implementation of the speed control software and the configured hardware with the results obtained on performance of the induction motor.
The system of induction motor driven by inverter and controlled by PLC proves a high accuracy in speed regulation. The effectiveness of implementing a proportional control law is very good in the range of speeds lower than 95% of synchronous speeds. Thus, PLC proved that are a very versatile and efficient tool in implementation of industrial control of electric drives.
Keywords: Electric drives, programmable logic controllers, computer controlled systems

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 P. Todos, V. Dorogan, V. Trofim, T. Vieru, M. Manole, V. Coseac.
 Tehnical University of Moldova, Laboratory of Microelectronics
 Bd. Stefan cel Mare 168, MD2004, Kishinev,
Moldova,
Phone 022-247143, Fax 022-248378

Abstract: The paper is dedicated to elaboration and manufacturing of new constructions of UV radiation sensors on the basis of III-V compounds and single-crystal Si. First construction, realized on GaAs – AlGaAs – SnO2 heterostructures,  contains a potential barrier at GaAs – AlGaAs interface to diminish the influence of visible radiation in photocurrent. It is shown that the contribution of visible radiation decreases with decreasing of AlGaAs layer thickness, with increasing of its doping level and composition. The second construction consists of two photoactive cells, differentially connected to loading resistor. One cell is covered with a layer, transparent for visible and IR radiation and non-transparent for UV radiation. Differential connection excludes the common for both cells components. Thus, the photocurrent of differential sensor is proportional only to UV radiation intensity.

Keywords: UV radiation sensor, heterostructure, single-crystal Si, differential connection, photocurrent, photosensibily.

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Mircea PETRESCU
University POLITEHNICA Bucharest
Petru Gabriel IVĂNCESCU
ROMTELECOM DTc Suceva
email: igabi@easynet.ro
Nicolae BOSNEAC
ACET S.A. Suceava

Abstract. These instructions provide basic guidelines to help possible contributors prepare their final camera-ready papers for submission to the Electrical Section in the Annals of  "Stefan cel Mare" University of Suceava. Abstracts (maximum 200 words) should be self-explanatory and summaries the essential qualities of papers.
Keywords: database, time oriented model, sequential time model, data base management system

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COSTICA  NITU
University “Politehnica “of Bucharest
Faculty of Automatic Control
and Computer Science
E-mail: cnitu@lucky.schur.pub.ro

Abstract: Neural networks are components within an overall application, not solutions in their own right. They can be used in conjunction with both conventional processing techniques and rule-based processing, such as expert systems. A correct mix of processing techniques can reduce the complexity of the solution and result in one that is much more robust. The applications of the neural model -- based control improve the system  performances, the speed of response and undesirable overshoot characteristics. In the paper methods for neural network implementation of the nonlinear models are presented. The proposed method is based on the activation function design and  offers more large possibilities for process modeling.
Keywords: Process modeling. Model based -- control, Feed-forward Networks, Nonlinear models.

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Mihai – Horia Zaharia
Technical University "Gh. Asachi" Iasi,
Bd.-ul D. Mangeron nr. 53, RO-6600 Iasi
email: mike@cs.tuiasi.ro

Abstract. The distributed systems became an answer to many problems in computing science. Unfortunately the variety of proposed solutions make difficile to find some general aspects in design process. A solution who can increase the speed of reserch for various proposed architectures is to simulate it. The Petri nets are suitable for computer process simulation. That is the reason for choosing them for modeling and simulation of complex activities which are implied into distributed systems. One of the most important problem in distributed systems design is the singular resource allocation. In this paper a Petri net model for singular resources allocation  is presented. Many authors treat this subject, but now new conceps, like generalised Petri nets appear, and that is the main reason of author to retake into account this theoretical approach.

Keywords: protocols, Petri nets, distributed systems

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Stefan-Gheorghe PENTIUC
"Stefan cel Mare" University of Suceava
str.Universitatii nr.1, RO-5800 Suceava
email: pentiuc@usv.ro

Ileana HAMBURG
Institute for Work and Technology,
Science Center NRW Gelsenkirchen, Germany
email: hamburg@iatge.de

Abstract. The model of knowledge-based enterprise is an interdisciplinary approach involving the best issues of business sciences, cognitive sciences and computer science. The paper presents a stepwise model specifications that are issued during a co-operation between the Institute for Work and Technology (I.A.T.), Science Center NRW Gelsenkirchen, Germany, and University of Suceava, Romania in the frame of the EU-Phare / TEMPUS Program, JEP 12132-97 named INCOT - Introduction of Information and Communication Technologies

Keywords: Knowledge-Based Enterprise Model, knowledge management, information technology

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Tudor AMBROS, Leonid IAZLOVEŢCHI, Tudor GHERMAN
L`Université Technique de Moldavie
Bd. Ştefan cel Mare nr.168, RM –2200 Chişinău

Résumé. Dans cette étude il s’agit du modéle mathématique du générateur synchrone inversé pour la description du processus transitoire du couit – circuit triphazé symétrique.On présente les résultats du calcul et des oscillogrammes de la variation des courants statoriques, rotoriques et du couple électromagnétique

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Doru E. TILIUTE
CNCF “CFR”-SA, Sectia CT3 Suceava
str. Mesteacanului Nr.2, Bl .24, Sc. A, Ap.13
Suceava 5800, Romania
email: dtiliute@eed.usv.ro

Abstract. In 1968 was introduced the current conveying concept, as a particular application of the current mode circuits. A few years later, the implementation of accurate current conveyor devices have determined the circuit designers to develop alternative topologies for the most known voltage mode circuits. This because the current-conveyors offers many important advantages over their equivalent voltage mode circuits using operational am-plifiers. Below the author shows the present stage of the current mode active filters achievement and the main ways followed for their development. Two new selective amplifiers are also presented.

Keywords: current conveyors, active filter.

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Leon MANDICI

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Robert HALIUC
SSI S.A. Suceava
email: hal@eed.usv.ro

Abstract. The distributed data base information management systems are modern approaches for information systems modeling the actual companies, most of them geographically distributed. In order to increase the access speed and the system security  the replication of the information stored in database is frequently used. The aim of this paper is to present the advantages and disadvantages of the replication in distributed data bases.

Keywords: distributed systems, data bases, replication

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Valeriu LUPU
“Spiru Haret” Informatics Highschool
str. Zorilor 17, RO-5800 Suceava
email: lupuv@lisv.svnet.ro
Cătălin LUPU
"Stefan cel Mare" University of Suceava
str.Universitatii nr.1, RO-5800 Suceava
email: catalinl@stud.usv.ro

Abstract. This paper describes a parallel method for sorting an array of numbers, using a multiprocessor system. The method is based on the synchronous messages transfer between processor. A processor will receive data from its left, will compare the data that is stored in it and will send the smallest value to the processor from its right (just in case the processor is not the last one). Finally, the processor array will contain the sorted array.
Keywords: data parallelism, microprocessors, complexity measures, parallel calculus, sorting algorithm

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Alin Dan POTORAC, Radu PENTIUC, Valentin POPA
"Stefan cel Mare" University of Suceava
str.Universitatii nr.1, RO-5800 Suceava
email: alinp@eed.usv..ro

Abstract:  The paper basically presents some y aspects of a practical implementation of a CVSD based system, using a microcontroller. The developed system and algorithm allow voice digitisation at a quite higher sampling rate and limited bandwidth, in order to send it on a limited band high frequency radio channel.
Keywords: CVSD, delta modulation, voice digitisation

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George MAHALU
"Stefan cel Mare" University of Suceava
str.Universitatii nr.1, RO-5800 Suceava
email: mahalu@eed.usv..ro

Abstract. This paper treat an electronic system used in one self-driving vehicle for that feedback is performed through a PC coupled video camera. The control system working in one way channel performed in radio or infrared mean. In any way the logic command structure is same and consists in two different circuits, one for transmitter block and other for receiver bloc.
Keywords: self-driving vehicle, divider, counter, transmitter, receiver, channel.

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Akbar KHODAPARAST-HAGHI (Ph.D.)
University of Guilan
P.O.Box 3756
Rasht
IRAN

Abstract. A thin, porous textile fabrics exposed to a low energy localized heat source such as dryer. A method is described for measuring dynamic surface temperature. The objectives of our study is to develop a technique using thermal imaging to characterize the temporal growth in material surface temperature. We measure surface temperature gradients on three different cotton fabrics, using infrared thermography. The dryer send the heat parallel to the fabric surface. An infrared camera mounted vertically to the fabric surface observes the thermal scene and produces a real-time, monocrome thermal image. The analog video images are recorded on tape for the entire experiment, with later extraction of the temperature data. The IR camera, which is calibrated at a temperature of 65⁰C, maps the spectral radiance onto thermal image of the fabric surface over a temperature range of 20-65⁰C. Following image acquisition, analog video images are digitized and treated to image processing routines (algorithms) to improve signal-to-noise ratio and transformation for extraction of useful data.

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Cristian MARINESCU
University POLITEHNICA Bucharest
email: cristian.marinescu@omicron.at

Marian DOBRE
University POLITEHNICA Bucharest
Department of Computer Science
Spl. Independentei 313, Sector 6
77206 Bucharest ROMANIA
email: Marian.Dobre@cs.pub.ro

Abstract. Web based applications are growing rapidly, due to the wide availability of the Internet and to their short development time, provided by the new emerging web software development technologies. The increasing demand for Internet applications implies the need for finding the best solutions to a large range of problems. For example, the problem of computer aided testing of human subjects over a network becomes more important every day. Not only schools and universities, but also a large number of other official institutions are interested in Computer Aided Assessment.
The Internet is already more widely deployed than any other computing system in history and continues to grow rapidly. Leaving in an era of the Internet communication, we have tried to develop a "classical" web oriented application, offering the possibility to test people through automated test procedures. The paper presents our results in establishing an Internet/intranet platform for testing human knowledge, using a network of computers, and technologies like Java servlet and JDBC. The advantages and disadvantages of servlets and CGI technology are both assessed, stressing on the superiority of the new servlet technology. We also present a practical comparison of the servlet based application with a classical client-server solution.
Keywords: CGI technology, Computer Aided Assessment, Internet, intranet, Java, servlet, WWW based application.

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Leon MANDICI; Dorel CERNOMAZU, Dorinel COSMA
"Stefan cel Mare" University of Suceava
str.Universitatii nr.1, RO-5800 Suceava
email: lmandici@eed.usv..ro

Résumé.  Dans l‘ouvrage les auteurs pressentent une parte des résultats de la recherche dans le domaine des entraînements électriques avec les moteurs linéaires asynchrone ? basse vitesse et inducteur bilatéral. Elles sont présentées certaines variantes constructive des enroulements électriques ? basse vitesse synchrone, ayant comme élément spécifique le décalage longitudinale d’entre les encoches d’un inducteur par rapport ? les encoches de l’inducteur complémentaire.
Mots clé: machine électrique, actionnement électrique, moteur linéaire a induction, enroulement électrique,

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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

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