Advances in Electrical and Computer Engineering
ISSN 1582-7445 - No 1 / 2004

   EDITOR

  Adrian GRAUR - "Stefan cel Mare" University of Suceava
 
   ASSOCIATE  EDITORS

  Ştefan Gh. PENTIUC - "Stefan cel Mare" University of Suceava
  Leon MANDICI -  "Stefan cel Mare" University of Suceava
  Dorel CERNOMAZU - "Stefan cel Mare" University of Suceava
 
 
   EDITORIAL  BOARD

 Tudor AMBROS   - Technical University of Chişinău - MOLDAVIA
 Dumitru N. ALEXANDRU   - Technical University Iasi
 Jao Paulo BAPTISTA   - Instituto Politecnico do Porto - PORTUGAL
 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
 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
 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
 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

Epilogue of 2004 Biennial DAS Conference
27-29 May, 2004

The 7th edition of the International Conference on Development and Application Systems was attended by distinguished professors from Romania, France, Belgium, Serbia and Montenegru, Greece, Ireland, Russia, Ukraine, Canada, Bulgaria, United Kingdom, USA, Austria, Singapore, Vietnam and Moldavia.

 The 96 papers addressed various problems and solutions in the following areas:
 

• Digital Systems in Process Control    23 papers
• Electrical Drives Control                   14 papers
• Data Transmission & Protocol           12 papers
• Information Technologies                   22 papers
• Computer Aided Design                     13 papers
• Pattern Recognition                            12 papers

This year’s papers were signed by 76 Romanian authors and 107 foreign authors, and the conference was attended by 70 Romanians and 37 foreigners.

The papers were published in the conference proceedings entitled Development and Application Systems (ISBN 973-666-106-7).
 
 
 

Professor Adrian GRAUR
 

 Abstract. Development of industry and agriculture put a problem of coastal water pollution control and the synthesis of the monitoring systems with the functions of water quality assessment in the active regimes. Vietnam has the coastal line equaled 3260 km. There are many estuaries and lagoons on the seashore of which the development of anthropogenic systems depends on the sea water quality. At the same time these systems generate the pollutants and contaminate the sea.  In the paper an exspert system for the water quality control in the estuary zone is developed- ESECEZ Expert System for the Ecological Control of Estuary Zone
Keywords: expert system, artificial intelligence, water quality assesment, estuary ecosystem
 
 

Abstract. By the endeavor of many scientists all over the world in recently has been created a new scientific direction: Geographical Information Monitoring System (GIMS) technology. This technology is based on the syntheses of database technology methods, GIS and mathematical models. Main idea of this technology is create automatic system for management, evaluations and forecasting of natural objects state. This paper represents the primary results of research in applying GIMS technology for analysis negative influence of the contamination discharge in the sea shore zone, utilizing data from Danang port, Vietnam, as a case study. Theo goal of the work described in this paper is to develop a computer system to help local administrators make the decision on designing and construction of contamination discharge devices also choosing the discharge contamination places for minimization of negative influences of discharge hydrodynamics properties and features of water environment in the sea shore zone of a reservoir. The software SHORE mentioned in this paper is one of realization of above. Proposed system consists of data management tool, adaptive mathematical model and a friendly interface between user and computer.
Keywords: monitoring software system, GIS, GIMS, water quality assesment, mathematical model
 
 

Abstract. When situating navigation and communication means in a region it is important to know the propagation conditions depending on the terrain, season and meteorological variations in that region . Having meteorological statistics and terrain data it is possible to set up static models of the microwave propagation for a particular region thus allowing performance optimization of the already installed equipment taking in consideration the average propagation conditions.
Keywords: system modeling, microwave sensors, GIS, GIMS
 
 

Abstract. In this paper is presented some aspects by the theory of ideal MBTs developed in the forward active regime where the transistors can amplify signals. Because many authors shown that source spin can be injected from the emitter to the collector, it is predicted that electrical current gain can be controlled effectively by magnetic field and source spin. The working paper is ending with some results about the current gain featuring. This is depending of some pointed conditions, like as the equilibrium or nonequilibrium spin.
Keywords: spin, bipolar transistor, junction, magnetoamplification,  charge density, spin splitting.
 
 

Abstract. In this paper work is analysed a magnetic field effect transistor structure. This device is imaged for generation of highly spin-polarized currents, whose operations is governed by a magnetic field. Is presented some approach methods of the physical study of device function under spintronics phenomenon. On the other hand is proposed a new approaching technique that consists in fractal form formalisms application. Not in the last ordering is considered the way to controlling the MFET channel conductivity under spin polarized carriers control.
Keywords: spin, magnetic FET, channel, giant magnetoresistance, DMS phenomenon, magnetic shell.
 
 

Abstract. Flip chip microelectronic assembly is the direct electrical connection of face-down electronic components onto substrates, circuit boards, or carriers, by means of conductive bumps on the chip bond pads. In contrast, wire bonding, the older technology, which flip chip is replacing uses face-up chips with a wire connection to each pad. The main advantages obtained by introducing this advanced technology consists in size reduction, high performance, high operating frequencies and data rates, flexibility, reliability and low cost over other packaging methods. Few considerations from production, assembling and surface mounted technology are presented in the final part of this paper.
Keywords: flip chip, bonding, technology, packaging, SMT, SMD.
 
 

Abstract: The real time control of traffic routing in asynchronous decentralized communication networks is investigated. This a decentralized routing strategy is obtained which is proved to be stable under suitable assumptions about the external inputs. The decentralized strategy is also shown to be loop fee in every steady-state situation. An algorithm is derived which updates routing tables according to changing load conditions. The model incorporates real control and information structures. Lower and upper bounds on cell and blocking are determined. The sequent two algorithm is given which asserts that the network performance objectives can be achieved by mens of the state dependent shorts route algorithm.
Keywords: Routing, large scale systems, decentralized control, communication control application, traffic control, estimation and prediction.
 
 

Abstract. The increasingly popular applicability of the distributed system produces the need for more sophisticated distributed control techniques.  In this respect, we suggest the use of a distributed control method based on simple finite state automata.  The entity examines the state of the automaton to determine its behaviour and, therefore, each of the distributed entities is "controlled" by its associated automaton.  The result of the collective behaviour of all of the entities is fed back to the automata.  This feedback changes their state.
Keywords: distributed control techniques, automata, multiple automata behaviour.
 
 

Abstract. The continuing globalization imposes new challenges to the ”e-supply chain”, among them the need of agents to react properly in case of cooperation or otherwise, according to environment changes. Our framework aims to find agents with similar business rules, with environment perception and its influence represented by causal relations. Then we try to find the unique strategy for these appropriates agents. The causal links are translated in RuleML derivation rules, to be used in decision making regarding other agents for long term business relationship. The framework is aimed to distinguish between public knowledge regarding the business activity available on the Semantic Web, and private knowledge, known to company insiders.
 
 

Abstract. Agent technology has developed significantly in the last few years and is estimated to be one of the most prominent technologies for building the interconnected open systems of the future. However, the related methodologies for modeling and solving problems with this new technology are still a subject of active research. In the paper, we describe an approach to modeling a distributed complex problem, the SETI problem, using a multi-agent system and we highlight the key design decisions. The problem is solved by a society of autonomous agents that try to fulfill their individual goals and the overall goal of the system by maximizing their reward (a number of points given to an agent for localizing alien signals). We present the system general architecture, the agent functionalities, the associated algorithms and the communication capabilities, and we discuss the benefits and limitations of the approach.
Keywords: multi-agent systems, communication, parabolic antennas, data transmission.
 
 

Abstract. Large-scale open distributed systems raise the problem of having (or not) confidence in the partners involved in a process of cooperation (or competition). In this interaction both the individual confidence and the more or less public reputation are involved in the decisions made individually or by groups. We are considering the trust in this setting and are looking at some possible combinations to achieve a workable model.
Keywords: multi-agent systems, trust, confidence, reputation, cooperation.
 
 

Abstract. This paper focuses on evaluation of the performance characteristics of data networks modelled with stochastic Petri nets (SPN). In the analysis of SPN we use simulations in respect to timing parameters in a generalized semi-Markov process (GSMP). By using existing results on perturbation analysis and by extending them to new physical interpretations we address unbiased sensitivity estimators correlated with practical solutions in order to attenuate the perturbations. An important advantage of this approach is that one simulation is needed for evaluating the stochastic Petri nets and the perturbation analysis and to take advantage of the state of the art.
Keywords: Data network, generalized semi-Markov process, stochastic Petri nets.