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Research Institute of Intelligent Computer Systems Ternopil National Economic University |
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2005, Vol. 4, Issue 1 |
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Contents and abstracts
COEXISTENCE OF STANDARDIZED WIRELESS SYSTEMS IN THE 2.4 GHZ-ISM-BAND Axel Sikora 1), Voicu F. Groza 2
1) Department of Information Technology, University of Cooperative Education Loerrach, Hangstrasse 46-50,
D79539 Loerrach, Germany, e-mail: sikora@ba-loerrach.de, http://www.ba-loerrach.de/~sikora
Wireless systems continue to rapidly gain popularity. This is extremely true for data networks in the local and personal area, which are called WLAN and WPAN, respectively. However, most of those systems are working in the license-free industrial scientific medical (ISM) frequency bands, where neither resource planning nor bandwidth allocation can be guaranteed. To date, the most widespread systems in the 2.4 GHz ISM band are IEEE802.11 and Bluetooth, with ZigBee and IEEE802.15.4 as upcoming standards for short range wireless networks. In this paper we examine the mutual effects of these different communication standards. Measurements are performed with real-life equipment, in order to quantify coexistence issues. EFFICIENCY ANALYSIS OF PARALLEL ROUTINE USING PROCESSOR TIME VISUALIZATION Volodymyr Turchenko 1)-2), Viktor Demchuk 1)
1) Research Institute of Intelligent Computer Systems
Ternopil Academy of National Economy
3 Peremoga Square, Ternopil, 46004, UKRAINE, e-mail: {vtu}, {vde}@tanet.edu.te.ua
The coarse-grain parallel algorithm of modular neural networks training with dynamic mapping onto processors of parallel computer is described in this paper. Parallelization of the algorithm is done on parallel computer 300 using MPI technology. The efficiency of this algorithm is estimated using modification of MPE visualization library, which measures processor executing time of parallel routines. BASES OF ELEMENTARY ARITHMETICS IN GALOIS’S FIELDS Lubomyr Petryshyn Department of informatics of the Prycarpathian national university, petryshynl@poczta.fm It is resulted the theoretical bases and structure of facilities for transformation and digital processing of messages in the Galois code systems and proved efficiency of their application in comparison with the known methods of binary coding. The lacks of implementation dynamics of arithmetic operations in binary codes and methods of their elimination are analyzed at the Galois code and increasing of digital processing speed. SYNTHESIS AND FPGA–IMPLEMENTATION BASED NEURAL TECHNIQUE OF A NONLINEAR ADC MODEL Mounir Bouhedda 1) 2), Mokhtar Attari 1)
1) LINS: Laboratory of Instrumentation
Faculty of Electronics and Computers, Houari Boumediene University
PO.Box 32, Bab-Ezzouar, 16111 Algiers, Algeria. E-mail: mattari@usthb.dz, URL: www.usthb.dz
The aim of this paper is to introduce a new architecture using Artificial Neural Networks (ANN) in designing a 6-bit nonlinear Analog to Digital Converter (ADC). A study was conducted to synthesise an optimal ANN in view to FPGA (Field Programmable Gate Array) implementation using Very High-speed Integrated Circuit Hardware Description Language (VHDL). Simulation and tests results are carried out to show the efficiency of the designed ANN. A PARALLEL MULTIRATE ALGORITHM FOR THE NUMERICAL INTEGRATION OF SYSTEM OF NONLINEAR DIFFERENTIAL EQUATIONS Petro Stakhiv 1), Serhiy Rendzinyak 2)
1) Prof., D.Sc. Eng., St. Bandera 12, 79013 Lviv UKRAINE, spg@polynet.lviv.ua
The new approach to calculate dynamic behavior of large-scale systems, separated on subsystems is presented. Parallelization efficiency of computing process is described. INVESTIGATION OF THE NONLINEAR FLUTTER OF VISCOELASTIC PLATES IN A SUPERSONIC FLOW Bakhtiyar Khudayarov Tashkent institute of irrigation and melioration. UZBEKISTAN, 700135, Tashkent-135, Chilanzar-16-24-56. E-mail: bakht-flpo@yandex.ru In this paper the flutter of nonlinear viscoelastic plates in a supersonic flow is investigated. The basic direction of work is consisted in taking into account of viscoelastic material’s properties at supersonic speeds. Quasi-steady aerodynamic panel loadings are determined using piston theory. The vibration equations relatively of deflection are described by Integrî-differential equations in partial derivatives. The plate nonlinear partial integro-differential equation is transformed info a set of nonlinear ordinary IDE through a Bubnov-Galerkin’s approach. The resulting system of IDE is solved through the Badalov-Eshmatov integration method. Critical speeds for plate flutter are defined. SMART SILICON SENSOR – MAGNETIC COMPASS ON THE BASE OF A 3-D HALL STRUCTURE Konstantin Dimitrov Institute of Control and System Research of the Bulgarian Academy of Sciences PO Box 79, BG-1113 Sofia, Bulgaria; e-mail: kdimitrov@icsr.bas.bg www.icsr.bas.bg In this paper is discussed some of the trends in the industrial designs of smart sensor systems. High performance sensor systems have been implemented by combining the sensing and signal processing functions on the same chip. A very promising magnetic compass for Earth magnetic field measurement is created on the base of a 3-D Hall structure. NUMERICAL METHOD OF VIBRATIONS RESEARCH IN LARGE FLEXIBLE SYSTEMS Olena Mul 1) *, Delfim Torres 2
1) Associate Professor, Institute of Computer Information Technologies, Ternopil State
Economical University,
3 Peremoga Square, 46004 Ternopil, Ukraine, olena@mat.ua.pt
The mathematical model of the real flexible elastic system is considered with the distributed and discrete parameters, which presents the equation at derivative parts with non-classical maximum terms. Complication of maximum terms makes impossible finding of exact analytical decision of such maximum task, in connection with what for researches the numerical method of the normal fundamental systems of decisions is used. Dependence of frequencies of possible vibrations is explored on different physical parameters of system. It is shown, that introduction to reverse communication network after speed with the defined values of the reverse communication coefficient allows controling the frequency spectrum in which excitation of vibrations are possible. OBJECT TRACKING SYSTEM BY TWO PAN-TILT MOVING CAMERAS AND ARM ROBOT Hiroyuki Ukida 1), Yoshio Tanimoto 2), Hideki Yamamoto 3)
1) Faculty of Engineering, The University of Tokushima, 2-1 Minamijosanjima-cho,
Tokushima-shi, Tokushima, JAPAN, ukida@me.tokushima-u.ac.jp
We propose an object tracking system using an arm robot and two pan-tilt cameras. In this study, we use the active search method to detect the object location in images of cameras. Moreover, we estimate the 3D coordinates of this object from detected locations in images using the binocular stereo method. By using 3D object locations, the robot and cameras are rotated toward to the object. To realize the high speed performance, we use the parallel processing by the thread function for the processes of the object detection, the 3D coordinate estimation, the camera control and the robot control. We perform the object tracking experiments and confirm the efficiency of the proposed method. THE PERSPECTIVE TECHNOLOGIES OF IDENTIFICATION AND AUTHENTICATION OF FINANCIAL TRANSACTIONS Sergiy Golovashych "Kharkov National University of Radioelectronics", Kharkov city, Ukraine, sgolov@gmail.com, http://www.kture.kharkov.ua In the article comparative description of modern technologies of authentication on the basis of smart cards is presented, the lacks of each of the considered technologies are noticed and the chart of dynamic authentication which allows removing the basic exposed failing is offered. The ground of expedience of NFC-technology application for construction of authentication systems, providing maximal defense of user from abuses of attendants is shown also. FAULT TOLERANT MEMORY SYSTEM WITH ACTIVE REDUNDANCY FOR CRITICAL APPLICATIONS Petru Cascaval 1), Doina Cascaval 2)
1) Department of Computer Science, E-mail: cascaval@cs.tuiasi.ro
This paper proposes a fault tolerant RAM memory architecture with active redundancy dedicated to critical applications. To assure high reliability, additional modules are provided in the system. To reach a high safety, memory system is composed by built-in self-testing RAM devices (BIST?RAM). Memory modules are tested online one by one, in a sequential order, during the normal operation. A primary module under testing is temporary replaced by another one. If one module is diagnosed as being failed it is eliminated from the system automatically and replaced with a spare module. The memory control unit responsible for performing the reconfiguration of the memory system has a cellular structure and introduces an acceptable extra delay for the memory access. METHOD OF CONSIDERATION A CHANGEABILITY OF EXTERNAL ENVIRONMENT AS AN ALTERNATIVE METHOD OF SOCIO-ECONOMIC PROCESSES MODELING Oleksandra Belz Department of information system of management of Ivan Franko National University of Lviv, Prospect Svobody 18, 79008 Lviv, Ukraine, homepc@list.ru The method of design of economic dynamics in a variable environment, which enables to carry out arbitrary nonlinear transformation and describe the moments of change of properties of the system without the problem of attachment of models to the time factor. MATHEMATICAL MODELLING OF PROBLEM ON NON-LINEAR FLUTTER OF VISCO-ELASTIC SHELLS Bakhtiyar Khudayarov Tashkent institute of irrigation and melioration. UZBEKISTAN, 700135, Tashkent-135, Chilanzar-16-24-56. E-mail: bakht-flpo@yandex.ru In this work is investigated the flutter of viscoelastic cylindrical shell streamlined by gas current. The basic direction of work is consisted in taking into account of viscoelastic material’s properties at supersonic speeds. The vibration equations relatively of deflection are described by Integra-differential equations in partial derivatives. By Bubnov-Galerkin methods reduced the problems to investigation of system of ordinary Integro-Differential Equations (IDE). The IDE are solved by numerical method, which based on using of quadrature formula. The algorithm of the numerical solution on the basis of the method was described. Critical speeds for cylindrical shell flutter are defined. The influence of the viscoelastic property of the material, geometrical and aerodynamically non-linearity to the current value of critical speed and amplitude-frequency characteristics of the cylindrical shells was analyzed. OPEN SOURCE SOFTWARE FOR THE DEVELOPMENT OF INFORMATIONAL SYSTEMS: COMPARATIVE ANALYSUS AND DEVELOPMENT PROSPECTS IN UKRAINE Ivan Boiko 1), Sergiy Lupenko 2), Andriy Luckiv 3)
1) Department of computers sciences of Ternopil State Technical University, ibojko@yandex.ru
In the article possibilities of opened software for information systems development and its perspectives in Ukraine are analyzed; the aspects of software development, using and cooperation are considered; the main problems which arise at software development and ways of their decision are resulted; the question of legal software using in work of researcher is reflected. |