ISSN 2224-087X (Print)
ISSN 2224-0888 (Online)

Collected scientific papers
"Electronics and information technologies"

(In 1966-2010 published under the title "Electrical engineering")

(Certificate of State Registration 17618-6468 from February 11, 2011)

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Issue 60

Issue 60, Pages: 3-11
Diagnostics mechatronic systems using functional decomposition
B. Blagitko, V. Brigilevich, I. Yarmolovskyj
The paper proposes a unified methodology for fault diagnosis of mechatronical systems. System models including electronic, mechanical and coupling subparts are developed. A diagnosis algorithm, originally introduced for electronic circuits, is extended to mechatronical systems. Differences of the application are also pointed out: large spread in time constants, different levels of measurement noise in different subparts. Tests with robot arm to confirm effectiveness of the method
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Issue 60, Pages: 12-20
Graphs decomposition algorithm by means of its carcass
T. Grishanovich
This study is devoted to the problems of decomposition (’partition’ or ’coloring’) of graphs. We describe a technique for partitioning by means of the graph’s carcass, along with the corresponding algorithm. Besides, an example of work of this algorithm is described in a more detail for the case of non-oriented unloaded graphs. We also give an example of program realization of the above algorithm using a specific programming language. Basic problems that appear when constructing normal trees of the graphs are described
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Issue 60, Pages: 21-26
Analytic algorithm for solving Van der Pol equation for computer mathematics systems
G. Zlobin, A. Dovhal
Van der Pol equation is well known in mathematics and electronics. It has such a feature that it’s stiffness parameter is proportional to it’s parameter μ. Numerical algorithms for solving ordinary differential equations very often use this equation for testing purposes. In this article we describe algorithm of solving analytically this equation using the method of small parameter and we research this algorithm for it’s stability with respect to parameter μ. Because of large number of ordinary analytic operations which are required for this algorithm we are using computer algebra system Maple
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Issue 60, Pages: 27-38
Automatic control system on the basis of multi-layer neural network
R. Lozynskyy, Z. Lyubun
The model of automatic temperature control on basis of multi-layer neural network is considered for the application of crystal-growing furnace. Effectiveness of multi-layer neural network is demonstrated as well as its stability under the condition of parameters variation of control object
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Issue 60, Pages: 39-44
Optimal selection of programming language for development of applications for dynamical systems modelling
A. Khariv, I. Khvyshchun, N. Baran
A considerable number of problems of simulation technical devices dynamics are being solved as linear algebraic equation systems. Such systems are often being solved using Gauss method or its modifications. The issue presents the results of Gauss algorithm performance depending from the programming language of its implementation
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Issue 60, Pages: 45-53
Adaptive diakoptical algorithm of electronic schemes’ modeling
I. Khwyshchun, B. Kvyatkovskyy
The algorithm for electronic circuits modeling is presented. Algorithm is based on the decoupled method of numerical integration. Performance boost of the partitioning topology adaptive choice procedure is investigated. The improvement of the existing partitioning algorithm has been suggested. Improvement allows increasing the performance of the circuits modeling process. The definition of the influence matrix is proposed. Influence matrix is then used as parameter for the partitioning topology choice algorithm. Investigated the kind of the problems for which proposed algorithm applies and gives performance boost
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Issue 60, Pages: 54-57
A modified method for the computation of the periodic steady-state response of nonlinear systems
Ya. Shmygelsky
For computation of the periodic steady state of the nonlinear dynamic system the new variant of damping Newton method is offered. Unlike classical damping Newton method, the offered method can work with zero value of the damping parameter. It is shown, that for a choice on each iteration of optimum value of the damping parameter it is possible to use known algorithms
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Issue 60, Pages: 58-64
Theoretical principles of the variation problem of electromagnetic field analysis. Part 2
M. Howykowycz, R. Filc
On the basis of the expression of energetic functional for formulation of a variational problem of electromagnetic field analysis, obtained in the Part 1 of the article, and on the basis of invariant approximations technique a discrete analogy of the said functional has been received. The get analogy is of tensor character what constitutes a natural outcome of application of Taylor’s polynomials to its derivation. It is a function of nodal values of vector magnetic potential and scalar electric potential. A system of nonlinear equations for minimization of the functional has been obtained
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Issue 60, Pages: 65-77
The modelling of fractal clusters growth and calculation of their optical spectra
I. Bolesta, R. Hrytskiv, I. Kolych
The relationship between the structure of fractal clusters and their optical spectra has been established. 2D simulation of the cluster growth has been performed within the framework of particle-cluster and cluster-cluster models. The calculation of fractal cluster spectra has been carried out by means of discrete dipole approximation method. It was demonstrated, that considering the interaction between fractal cluster elements allows to observe long-wavelength bands of the surface plasmonic resonance. The peaks positions of these bands are red shifted with respect to the resonant peaks of the non-interacting particles. Essential results of the present research are in good agreement with the experimental optical studies of nanodisperse systems
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Issue 60, Pages: 78-83
Forecasting lightning’s dangerous of the phenomena on the basis of likelihood models of process of passive registration and lightning direction finding
V Danylovych, V. Smychok
In article the problem of revealing and forecasting of lightning’s nature is considered. Authors offer a method of passive localization of lightning without use of a meteorological radar station. Application of the parametrical approach to modeling of the basic meteorological parameters lightning the phenomena is offered. The probability-theoretic model which is offered provides optimum forecasting of dynamic interrelations of process. At modeling in forecasting calculation the especial attention addresses on "vertical currents" in atmosphere
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Issue 60, Pages: 84-92
Design of composite materials by chain electric circuit
Yu. Mochulsky
The results of research of a withstand mode in a chain CL-circuit, which is used as an electric model of composite materials, made of microscopic elements are presented. It is shown that this circuit with a finite number of chains can have two modes: mode of rapid damping of signal and mode of discrete standing wave, depending on the frequency of input signal
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Issue 60, Pages: 93-103
Temperature distribution in tissue under radiofrequency ablation of tumors
B. Pavlyshenko
The analysis of non-stationary boundary problem for radiofrequency ablation model of tissue tumors has been carried out. Spatial distributions of temperature, potential and thermo-destruction zones have been analyzed with a finite-element method for different time periods. The electrodes with changeable surface potential have been demonstrated to be efficiently used.
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Issue 60, Pages: 104-110
Processing of observation data for artificial Earth satellites at the satellite laser ranging station "Lviv-1831"
S.V. Apunevych, A.I. Bilinsky, S.Ye. Apunevych, Ya.T. Blagodyr
Satellite Laser Ranging (SLR) appears to be one of the most important techniques for geodesic and geophysical explorations. An observation in frame of the SLR represents measurements of the time intervals needed for ultra-short laser pulse to pass from Earth-based station to the satellite and back, which is the essence of solving any ranging problem. The SLR-station of Astronomical Observatory (Ivan Franko National University of Lviv) is included to the International Laser Ranging Service under the code ID "LVIL-1831". For the initial data processing, a standard Herstmonceux algorithm is used. It defines the order for calculating so-called normal points from the observations and theoretical predictions for satellite orbits, to be directed to the international data centers. Till recently, the SLR-station "LVIV-1831" has used the software supplied by producer of the hardware, with the closed code. The changes in the input and output data formats, as well as upgrades of the receiving equipment have raised a necessity for development of original software bundle, to include the real-time guiding system, the detection system, and the data processing one. For the data processing the authors have developed a computer program under the codename NoPo. It uses novel methods for interpolation and fitting, time-series analysis and statistical filtering. The software is a shareware implemented in the programming language C for Gnu/Linux platform.
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Issue 60, Pages: 111-117
WS3600 weatherstation application on satellite laser ranging station "Lviv-1831"
A. Bilinsky, K. Martynjuk-Lototsky, N. Virun, S. Apunevych, Ya. Blagodyr, E. Vovchyk
Laser ranging of Earth satellites represents measuring a time taken by optical pulse for its flight towards a given satellite and back. When the optical pulse passes through the Earth’s atmosphere, it suffers significant influence due to, e.g., a difference of the pulse velocity from that for the free space, and a curved pathway. To keep the observational results at a 10 mm-accuracy level and a long-term stability, it is necessary to take into account the instantaneous state of the atmosphere. This problem is solved by the technique involving simulations of weather parameters along the optical pulse trajectory, using ground-based data measured on the station. Therefore the accuracy and efficiency of work of the weather station are among key pre-conditions of high-quality scientific data. In this paper we consider the weather station as a component of satellite laser ranging station, as well as influence of the former on the accuracy of observational results. We present implementation of connection of the weather station WS3600 to a personal computer with the operating system Linux in the form of complex of programs and scripts with discriminated data server.
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Issue 60, Pages: 118-123
Technique optimization for determining parameter of fractional power filter involved in the correlation function for speckle image analysis
I. Golynksy, L. Muravsky and T. Polovynko
In this work the surface strains appearing in composite materials under static loads have been studied, using a speckle correlation technique. We have optimized a method for calculating the index of fractional-power filter involved in the correlation function utilized when analyzing speckle images. The dependences of specific intensity and averaged displacement d on the α parameter of the fractional-power filter have been derived.
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Issue 60, Pages: 124-131
Sensor controls of spirits on the basis of zinc oxide and the analysis of their response by means of neural network technologies
A. Lyashkov, T. Bulanaya, I. Gomilko
We study properties of ceramic sensors based on Zn associated with their gas-sensitivity to steams of ethyl and isoamyl spirits. A technique is developed for processing signals of the gas sensors, which uses analysis of time and temperature dependences of electrical conductivity in various gas environments and under different partial pressures of adsorbate. When solving problems of processing the signals of the gas sensor, we have employed neural-network algorithms that allow reducing considerably a quantity of images coming from the sensor, which are necessary for data processing.
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Issue 60, Pages: 132-138
Methods of indirect measurment of biosignals and fisical values by relaxation process
V. Mosiychuk, O. Sharpan
The way of implementation of indirect digital measurement of several informative and several reference signal is theoretically proved by one sensor control. It is researched direct influence of physiological processes on speed of a relaxation and transformation of duration of relaxation process to a digital code. Using models of bidirectional port of the CMOS microcontroller, semiconductor junction and a biological tissue, ways of practical implementation of such measurements of biosignals are shown. On the basis of equivalent circuit algorithmic steps necessary for digital primary conversation are certain.
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Issue 60, Pages: 139-146
Energy functions in content-aware image resizing
Yu. Shyyka and R. Shuwar
Different aspects of construction and application of energy functions for the problems of content-aware image processing are considered. In addition to the functions known from the literature, we suggest to apply high-pass filter based on fast Fourier transform as the energy function. Using the program implementation of the Seam Carving method, different energy functions are studied. The peculiarities of utilization, as well as advantages and shortcomings of the energy functions under test are discussed. A dependence of the average energy of image upon the image dimension is suggested as a criterion for efficiency of different energy functions.
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Issue 60, Pages: 147-155
First principle simulation of the band energy structure for Ag2CdI4 superionic crystal
I. Bolesta, S. Velgosh, I. Karbovnyk
The first principle calculations of the band energy structure for Ag2CdI4 superionic crystals were carried out. DFT soft pseudopotential method was used as a calculation tool. Perdew-Zunger exchange correction approach was considered. CASTEP computer code was employed for the purpose of simulations. Band energy dispersion as well as the contribution of particular electronic terms to the total density of electronic states was analyzed. Additionally, the analysis of the interband extinction coefficient was performed and the theoretical results were compared to the experimental data.
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Issue 60, Pages: 156-162
Evolution of charge in dielectric on the divide border Bi-Si-Al stimulated by radiation affect
B. Pavlyk, A. Hrypa, D. Slobodzyan, R. Lys, J. Shykoryak, R. Didyk
Radiation-stimulated changes in volt-farad characteristics, density of surface states and the value of effective charge localized in the dielectric layer were investigated. It was established that X-ray irradiation at doses D<260 Gr leads to the localization of positive charge at the generated capture centres and, consequently, reduces the amplitude characteristic peak at VFC. In the studied dose range the formation of new centres was not revealed.
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Issue 60, Pages: 163-167
Investigation of optical absorption spectra of K2MgxNi1-x(SO4)26H2O crystal
I. Polovynko, S. Rykhlyuk, V. Koman
The original growth method of the Tutton salts mixed crystals is offered. Optical absorption spectra of K2MgxNi1-x(SO4)26H2O (x = 0; 0,2; 0,4) crystals were investigated in this work. of the crystal field strength Dq and Rakah parameter B. Possibility of the usage of such crystals with nickel ions as effective optical filters in UV range in optoelectronic devices is shown. Transmittance for UV range λ = 220-270 nm in investigated crystals is increasing while concentration of magnesium is increasing.
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Issue 60, Pages: 168-175
Magnetization and gyromagnetic ratio in Ga and Al- doped ferrogarnet Tm3Fe5O12
I. Syvorotka
Concentration and temperature dependence of magnetization and effective gromagnetic ratio in Ga and Al- doped ferrogarnet Tm3Fe5O12 was calculation. Neel model of Weiss molecular field theory with allowance for distribution functions of Ga and Al by sublattice in garnet has been used. Established the compensation of moment of momentum and compensation of magnetic moment in ferrogarnet Tm3Fe5-xAlxO12 don’t observe. Ga concentration in Tm-garnet with room temperature compensation of moment of momentum has been determinate.
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Issue 60, Pages: 176-185
Using personal computers in the course "Theory of oscillations and waves"
G. Zlobin, O. Dovhal
Radiophisics chair of Ivan Franko National University of L’viv reads lections of course "Theory of oscillations and waves" lots of years. Laboratory session of this course lots of years is talking using computer systems such as DS0, Matlab and Octave which allow student quickly and interactively solve given mathematical problems and to build expected graphics. Such a way allows a student to spend more time on learning theoretic material rather than executing routine algebraic and graphic operations. This article describes most used practical ways to set the laboratory session of course "Theory of oscillations and waves".
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Issue 60, Pages: 186-194
The hardware and software support of laboratory work on electrotechnics and electronics
Z. Lyubun, I. Musiichuk, V. Rabyk
Given work is devoted to description of the hardware and software support of laboratory stand on the electrotechnics and electronics. Basic technical descriptions of stand and laboratory works executed with its help are given. The modes of stand work, functional designation of its keyboard and indications are considered in detail. As an example, a laboratory work devoted to research of universal active filter is examined. The results of modeling of this filter and their comparison with experimental data are given.
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Issue 60, Pages: 195-196
In commemoration of Lev Aronovych Sinitsky
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© Ivan Franko National University of Lviv, 2011

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