Radio Electronics, Computer Science, Control
http://ric.zntu.edu.ua/
<p dir="ltr" align="justify"><span><strong>Description:</strong> The scientific journal «Radio Electronics, Computer Science, Control» is an international academic peer-reviewed publication. It publishes scientific articles (works that extensively cover a specific topic, idea, question and contain elements of their analysis) and <span lang="EN">r</span><span lang="RU">eviews (works containing analysis and reasoned assessment </span><span lang="EN">of </span><span lang="RU">the author's original or </span><span lang="EN">published </span><span lang="RU">book)</span> that receive an objective review of leading specialists that evaluate substantially without regard to race, sex, religion, ethnic origin, nationality, or political philosophy of the author(s).<span id="result_box2" lang="en"><span class="hps"><br /> </span></span><strong>Founder and </strong></span><strong><span>Publisher</span></strong><span><strong>:</strong> <a href="http://zntu.edu.ua/zaporozhye-national-technical-university">Zaporizhzhya National Technical University</a><span lang="uk">.</span> </span><strong><span>Country:</span></strong><span> Ukraine<span lang="uk">.</span><span id="result_box1" lang="en"><span class="hps"><br /> </span></span><strong>ISSN</strong> 1607-3274 (print), ISSN 2313-688X (on-line).<span id="result_box3" lang="en"><span class="hps"><br /> </span></span><strong>Certificate of State Registration:</strong> КВ №6904</span><span lang="uk">. </span><span>The journal was registered by the State Committee for information policy, television and radio broadcasting of Ukraine in 29.01.2003.<span id="result_box4" lang="en"><span class="hps"><br /> </span></span>In accordance with the decision of the <span lang="en-us">P</span>residium of All-Ukrainian Certification Commission (<span lang="uk">№ </span>1-05/4 dated 05.26.2010<span lang="uk">) </span>the journal <span lang="en-us">"Radio Electronics, Computer Science, Control" was included </span>in the <strong>List of the <span lang="en-us">scientific specialized periodicals of </span>Ukrain<span lang="en-us">e</span></strong> where <span lang="en-us">the results of dissertations for PhD and D. Sc. </span>in <span lang="en-us">Technical Sciences</span>, Physics and Mathematics (with specialization in Radiophysics) may be published.</span><span><span id="result_box25" lang="en"><span class="hps"><br /> </span></span><span id="result_box26" lang="en"><span class="hps">By the Order of the Ministry of Education and Science of Ukraine from 12.21.2015 № 1328 "On approval of the decision of the Certifying Collegium of the Ministry on the activities of the specialized scientific councils dated 15 December 2015" journal is included in the <strong>List of scientific specialized periodicals of Ukraine</strong>, where the results of dissertations for Doctor of Science and Doctor of Philosophy in Mathematics and Technical Sciences may be published.</span></span><span id="result_box27" lang="en"><span class="hps"><br /> </span></span></span><strong> <span>Year of Foundation:</span></strong><span> 1999. </span><strong><span>Frequency :</span></strong><span> 4 times per year (before 2015 - 2 times per year).<span id="result_box6" lang="en"><span class="hps"><br /> </span></span></span><strong> <span>Volume</span></strong><span><strong>:</strong> up to 20 conventional printed sheets. </span><strong><span>Format:</span></strong><span> 60x84/8. <span id="result_box7" lang="en"><span class="hps"><br /> </span></span></span><strong> <span>Languages:</span></strong><span> English, Russian, Ukrainian.<span id="result_box8" lang="en"><span class="hps"><br /> </span></span></span><strong> <span>Fields of Science :</span></strong><span> Physics and Mathematics, Technical Sciences.<span id="result_box9" lang="en"><span class="hps"><br /> </span></span></span><strong> <span>Aim: </span></strong><span>serve to the academic community principally at publishing topical articles resulting from original research whether theoretical or applied in various aspects of academic endeavour<span lang="ru">.</span></span><span><strong><br /> </strong></span><strong> <span>Focus:</span></strong><span> fresh formulations of problems and new methods of investigation, help for professionals, graduates, engineers, academics and researchers disseminate information on state-of-the-art techniques according to the journal scope.<br /> <span> <strong>Scope:</strong></span> radio physics, micro-, nano- and radio electronics, computer hardware and software, computer networks and telecommunications, algorithm and programming theory, optimization and operations research, machine-machine and man-machine interfacing, mathematical modeling and computer simulation, data and signal processing, control in technical systems, artificial intelligence, including knowledge-based and expert systems, data mining, pattern recognition, artificial neural and neuro-fuzzy networks, fuzzy logics, swarm intelligence and multiagent systems, hybrid systems.</span><span><strong><br /> </strong></span> <span> <strong><span> Journal sections:</span></strong><span><span id="result_box10" lang="en"><span class="hps"><br /> </span></span></span></span> <span> - radiophysics;<span id="result_box11" lang="en"><span class="hps"><br /> </span></span>- radio electronics and telecommunications;<span id="result_box12" lang="en"><span class="hps"><br /> </span></span>- mathematical and computer modelling;<span id="result_box13" lang="en"><span class="hps"><br /> </span></span>- neuroinformatics and intelligent systems;<span id="result_box14" lang="en"><span class="hps"><br /> </span></span>- progressive information technologies;<span id="result_box15" lang="en"><span class="hps"><br /> </span></span>- theory and methods of automatic control;<span id="result_box16" lang="en"><span class="hps"><br /> </span></span>- control in technical systems.</span><span><span><span id="result_box17" lang="en"><span class="hps"><br /> </span></span><strong>Abstracting and Indexing:</strong> <strong>The journal is indexed in <a href="http://science.thomsonreuters.com/cgi-bin/jrnlst/jlresults.cgi?PC=MASTER&Full=Radio%20Electronics%20Computer%20Science%20Control" target="_blank">Thomson Reuters Web of Science</a></strong><span> (WoS) scientometric database</span><span>. </span> </span></span>The articles, published in the journal<span lang="en-us">,</span> are abstracted in leading international <span lang="en-us">and </span>national <strong>abstract<span lang="en-us">ig</span> journals</strong> and <strong>scientometric databases</strong>, and also are placed <span lang="en-us">to</span> the <strong>digital archives</strong> and <strong>libraries</strong> with free on-line<span lang="en-us"> access: Academic Keys, ACNP, ADAT, Akademik Dizin, ARDI, BASE, CiteFactor, CNKI, COPAC, CrossRref, DIIF, DOAJ, DOI, DRJI, EBSCO, eLibrary.ru, ETOC, Exlibris, EZB, GBV/GVK, GENERAL IMPACT FACTOR, GetInfo, GIF, Google Scholar, Impactfactor.pl, Index Copernicus, INSPEC, ISRA JIF, ISSN, JIFACTOR, Jour Informatics, Journalindex.net, JournalTOCs, Konferencii.ru, MIAR, OAIster, OAJI, Open Science Directory, Openaccessarticles, Openaire, Perechen-izdaniy.ru, PUBGET, Research Bible, ROAD, Scholar Steer, Sciary, SHERPA/RoMEO, SIS, SJIF, SJournals, SSM, UIF, WorldCat, WorldWideScience, ZDB, VINITI, Djerelo, UINC, Ukraininca Naukova, Ulrich’s Periodical Directory, Universia, URAN, V. I. Vernadsky National Library of Ukraine, and others which are listed and described <a href="/about/editorialPolicies#custom-0">here</a>.</span></p><p dir="ltr" align="justify"><span><span><strong>Editorial board: </strong><em>Editor in chief</em> - <span><span>S. A. Subbotin</span></span> , D. Sc., Professor; <em>Deputy Editor in Chief</em> - D. M. Piza, D. Sc., Professor. The <em>members</em> of Editorial Board are listed <a href="/about/editorialTeam">here</a>.<span id="result_box19" lang="en"><span class="hps"><br /> </span></span><strong>Publishing and processing fee:</strong> Articles are published and peer-reviewed <strong>free of charge</strong>.<span id="result_box20" lang="en"><span class="hps"><br /> </span></span></span><strong> <span>Authors Copyright: </span></strong><span>The journal allows the authors to hold the copyright without restrictions and to retain publishing rights without restrictions. The journal allows readers to read, download, copy, distribute, print, search, or link to the full texts of its articles. The journal allows to reuse and remixing of its content, in accordance with a Creative Commons license СС-BY.<span id="result_box21" lang="en"><span class="hps"><br /> </span></span></span><strong> <span>Authors Responsibility:</span></strong><span> Submitting the article to the journal, authors hereby assume full responsibility for the copyright compliance of other individuals and organizations, the accuracy of citations, data and illustrations, nondisclosure of state and industrial secrets, express their consent to transfer for free to the publisher the right to publish, to translate into foreign languages, to store and to distribute the article materials in any form. Authors who have scientific degrees, submitting the article in the journal, thereby giving their consent to free act as reviewers of other authors articles at the request of the journal editor within the established deadlines. The articles submited to the journal must be original, new and interesting to the reader audience of the journal, have reasonable motivation and aim, be previously unpublished and not be considered for publication in other journals. Articles should not contain trivial and obvious results, make unwarranted conclusions and repeat conclusions of already published studies.<span id="result_box22" lang="en"><span class="hps"><br /> </span></span></span><strong> <span>Readership: </span></strong><span>scientists, university faculties, postgraduate and graduate students, practical specialists.<span id="result_box23" lang="en"><span class="hps"><br /> </span></span></span><strong> <span>Publicity and Accessing Method :</span></strong><span> <strong>Open Access</strong> on-line for full-text publications<span id="result_box24" lang="en"><span class="hps">.</span></span></span></span></p><p dir="ltr" align="justify"><span><strong><span style="font-size: small;"> <img src="http://journals.uran.ua/public/site/images/grechko/1OA1.png" alt="" /> <img src="http://i.creativecommons.org/l/by-sa/4.0/88x31.png" alt="" /></span></strong></span></p>Zaporizhzhya National Technical Universityen-USRadio Electronics, Computer Science, Control1607-3274<h3 align="justify"><span style="font-size: small;">Creative Commons Licensing Notifications in the Copyright Notices</span></h3><p align="justify"><span style="font-family: Verdana, Arial, Helvetica, sans-serif; font-size: small;">Authors who publish with this journal agree to the following terms:</span></p><ul><li><p align="justify"><span style="font-family: Verdana, Arial, Helvetica, sans-serif; font-size: small;">Authors retain copyright and grant the journal right of first publication with the work simultaneously licensed under a <a href="http://creativecommons.org/licenses/by/3.0/" target="_new">Creative Commons Attribution License</a> that allows others to share the work with an acknowledgement of the work's authorship and initial publication in this journal.</span></p></li><li><p align="justify"><span style="font-family: Verdana, Arial, Helvetica, sans-serif; font-size: small;">Authors are able to enter into separate, additional contractual arrangements for the non-exclusive distribution of the journal's published version of the work (e.g., post it to an institutional repository or publish it in a book), with an acknowledgement of its initial publication in this journal.</span></p></li><li><p align="justify"><span style="font-family: Verdana, Arial, Helvetica, sans-serif; font-size: small;">Authors are permitted and encouraged to post their work online (e.g., in institutional repositories or on their website) prior to and during the submission process, as it can lead to productive exchanges, as well as earlier and greater citation of published work.</span></p></li></ul>THE MULTIPATH ERRORS CORRECTION IN THE TESTIMONY OF SATELLITE NAVIGATION SYSTEMS BASED ON THEIR SIGNALS WAVELET TRANSFORMS
http://ric.zntu.edu.ua/article/view/130820
Context. This research aims to improve the satellite navigation systems accuracy due to the correction of satellite signals multipath<br />propagation errors. The multipath effect errors reducing problem on the navigation solutions accuracy is one of the most pressing problems<br />in modern satellite navigation, because the error introduced by the satellite signals reflections can be up to tens of meters, which greatly<br />complicates the precise positioning task in difficult terrain. For example, in dense urban development conditions, with using satellite<br />navigation technologies in design and construction.<br />Objective. The main objective is to reduce multipath error signal at least one order, which will significantly increase the accuracy of the<br />navigation task solution.<br />Method. When solving the relative positioning tasks, it is often difficult, basically from a financial point of view, to provide the entire<br />receivers set with the same antennas using hardware methods. Including because of the effective use of funds, it was decided to consider the software methods. In this article, is considered a method for correcting the multipath error by using the wavelet transform of incoming navigation signals.<br />Results. The efficiency the proposed method is demonstrated on real satellite navigation data. Software implementation and all<br />experiments are made by the computer mathematics package MATLAB. The results showed the multipath correction method efficiency and<br />confirmed the expected accuracy after processing by the proposed technique.<br />Conclusions. Based on the results obtained in this paper, we can conclude that the use of wavelet transformation improves the<br />measurements quality used to obtain a navigation solution, thereby increasing its accuracy, regardless of terrain.K. V. KozadaevE. I. KozlovaI. A. MitrakhovichK. I. Kireyeva171310.15588/1607-3274-2018-1-1STUDY OF THE MULTI-INPUT LUT COMPLEXITY
http://ric.zntu.edu.ua/article/view/130868
Сontex. The programmable logic integrated circuits FPGA (field-programmable gate array) used realization of the generator of<br />functions LUT (Look Up Table), which is configured by loading a configuration memory for calculating a logic function in perfect<br />disjunctive normal form (PDNF). The LUT dimension determines the technological limitations of Mead and Conway on the number of<br />series-connected MOS transistors. The standard number of LUT inputs for many years was 3 or 4, and 4-LUT is constructed from two 3-<br />LUTs with an additional 1-LUT. However, in many projects, it is required to calculate functions of a large number of arguments. This<br />requires a multi-input LUT, which is built as a decomposition of 3-LUT, 4-LUT. The speed of computing logic functions determines by the<br />delay in the coupling matrices, so this decomposition leads to a decrease in performance. In recent years, the direction of adaptive logical<br />modules (ALM) has been actively developing, in which the user has access to various versions of logical elements for five, six and even<br />seven, eight variables, which leads to an increase in performance. However, the manufacturer’s documentation does not provide a detailed<br />description of the features of such multi-input LUTs, taking into account the Meade-Conway constraints. In addition, there are no estimates<br />of complexity and speed of multi-input LUTs. The analysis of sources allows suggests a further increase in the LUT bit capacity and the<br />convergence of FPGA and CPLD (complex programmable logic devices) capabilities in terms of bit depth. Therefore, studies of the features<br />of constructing multi-input LUTs are relevant and the authors attempted to analyze the implementation of such prospective multi-bit logic<br />Objective. The purpose of this work is to estimate the complexity and speed of the decomposition of a multi-bit LUT.<br />Method. Obtaining expressions for estimating the complexity and speed of decomposition of a multi-bit LUT on a LUT of a lower bit<br />length.<br />Results. A comparison of the complexity and delay in the number of transistors in the decomposition of a multi-bit LUT in the<br />computer mathematics system Mathcad is performed.<br />Conclusions. The conducted researches made it possible to establish the features of constructing multi-bit LUTs and to evaluate<br />various variants of decomposition with further increase in the LUT dimension with the subsequent choice of the optimal ALM variant.S. F. TyurinA. V. Grekov1142110.15588/1607-3274-2018-1-2INFORMATIVE PARAMETERS OF DYNAMIC NONSTATIONARY OF CARDIOSIGNALS
http://ric.zntu.edu.ua/article/view/131452
Contex. Modern electrocardiography, in spite of qualitative improvement in hardware and data processing capabilities, for today has<br />practically exhausted a resource of reception of the additional diagnostic information. In the article an attempt is made to create a new method<br />for processing electrocardiograms based on the use of the ECG signal model, which takes into account the piezoelectric effect in some<br />biological tissues and cell connections (blood, vessel walls).<br />Objective. Probabilistic justification of the possibility of forming fundamentally new informative diagnostic features, which uses the<br />time-frequency correlation between two wavelet spectra of the ECG signal and its linear transformation. Method. As such a model is used the additive model of the potential of the cardiac muscle (induced electric field) and the piezoelectric<br />potential of the blood-vessel system caused by myocardial contraction. To isolate the influence of the induced potential is proposed a method<br />of linear transformation ECG signal. This method has a high sensitivity to local spectral nonstationarity. Wavelet transform is used to<br />implement this method. The coefficient of normalized inter-spectral correlation (CNIC) is proposed as a quantitative indicator of the spectral<br />nonstationarity of the ECG signal. The developed mathematical apparatus in the work is used for the analysis of two electrocardiographic<br />signals: conditional norm and with the consequence of myocardial infarction.<br />Results. As a result of the calculated CNIC, the possibility of a quantitative difference of these states with a sufficiently high statistical<br />reliability is shown. The basic result of the work is a probabilistic justification for the possibility of forming fundamentally new informative<br />diagnostic features using the time-frequency correlation between two wavelet spectra of an ECG signal and its linear transformation. High<br />sensitivity and information significance of correlation diagnostic features are confirmed by examples of discrimination of parametrically<br />inhomogeneous ECG signals.<br />Conclusions. Main results of the study: the spectral non-stationarity of the cardiac signal has been confirmed theoretically and<br />experimentally; The functional interrelation of the spectral nonstationarity of the ECG signal with the effects of quantization of the rate of its change is obtained; A method for the parametric determination of the coefficient of inter-spectral correlation was developed, which makes it possible to quantitatively describe the dynamics of the local spectral changes in the cardiac signal for the tasks of automatic express control and diagnostics of cardiac states and carried out its approbation.P. F. ShchapovS. N. KovalE. I. KorolR. S. TomashevskyiT. I. Mahdalyts1222910.15588/1607-3274-2018-1-3GIS-TECHNOLOGIES AND MATHEMATICAL SIMULATION TO PREDICT LIGHTNING-CAUSED FOREST FIRE DANGER
http://ric.zntu.edu.ua/article/view/131455
Context. The components of the geoinformation system for monitoring, forecasting and assessment of forest fire danger caused by<br />thunderstorm activity are developed. Objective of the work is to create an embedded software tool for physically based forecasting, monitoring and evaluation of the probability of forest fire occurrence as a result of the impact of a lightning discharge on a tree trunk.<br />Method. Structural analysis is used to design elements and information flows inside and outside of the developed geographic information<br />system. Mathematical modeling is used to determine the parameters of tree ignition by the cloud-to-ground lightning discharge. Mathematically,<br />the process of tree trunk heating is described using a system of non-stationary heat conduction equations with a source part responsible for the heat release according to the Joule-Lenz law in the core of the tree trunk. The finite difference method is used to solve the differential heat<br />equation. Finite-difference analogues are solved by the double-sweep method. Program realization is implemented in the built-in high-level<br />language. The probability theory (conditional probability) is used to develop a probabilistic criterion for forest fire danger estimation.<br />Results. A software tool is developed to estimate the tree ignition delay time as a result of the impact of a cloud-to-ground lightning<br />discharge. The GIS-system component is developed in the high-level programming language Python. We have obtained probability distribution of forest fire occurrences from thunderstorms for the territory of the Timiryazevsky forestry in the Tomsk region is obtained.<br />Conclusions. We have proposed a physically proved method for forecasting, monitoring and assessing forest fire danger caused by<br />thunderstorm activity. The deterministic mathematical model is used to simulate tree ignition by the cloud-to-ground lightning discharge in<br />conjunction with the probabilistic criterion for assessing forest fire danger. We have analysed forest fire danger for a typical territory of the<br />Tomsk region (Timiryazevskiy forestry).N. V. BaranovskiyE. P. Yankovich1304010.15588/1607-3274-2018-1-4APPLICATION PARTICLE SWARM ALGORITHM TO MINIMIZE THE COST OF CONDUCTING MULTIVARIATE EXPERIMENT
http://ric.zntu.edu.ua/article/view/131546
Context. The actual problem of obtaining a sequence of experiments in the conduct of a full factor experiment ensuring its minimum cost<br />has been solved.<br />Objective – is to create a method for optimizing multifactor experimental plans using an optimization algorithm for the particle swarm.<br />Method. A method is proposed for constructing an optimal experiment design matrix for the cost of implementation using the particle<br />swarm algorithm. The particle swarm method is based on modeling the behavior of the particle population in the parameter space of the<br />optimization problem. In the beginning, the number of factors and the cost of the transition for each level of factors are introduced. Then,<br />taking into account the input data, a composite matrix of experiment planning is formed. The particles are scattered randomly across the<br />entire composite experiment design matrix and each particle has a random velocity vector. After that, the particles begin to move along the<br />rows and columns of the matrix. At each point where the particle visited, the value of the experiment is calculated. In this case, each particle<br />remembers which (and where) the best value of the cost of the experiment, she personally found and where the point is located, which is the best among all the points that explored the particles. At each iteration, the particles correct their velocity (module and direction) in order to be closer to the best point on the one hand, which she found herself and, at the same time, to approach the point that is currently globally<br />better. After a certain number of iterations, the particles are collected near the best point. Then the current coordinate of each particle is<br />corrected. After this, the cost of the experiment is calculated at each new point, each particle checks whether the new coordinate has become<br />the best among all the points where it visited. Then, among all the new points, we check whether we have found a new globally better point,<br />and if found, remember its coordinates and the value of the cost of conducting the experiment in it. Then the gain is calculated in comparison<br />with the initial cost of the experiment.<br />Results. The software that implements the proposed method is developed, which was used in carrying out computational experiments to<br />study the properties of the method.<br />Conclusions. The conducted experiments confirmed the efficiency of the proposed method and the software that implements it, and also<br />allow them to be recommended for application in practice when constructing optimal experimental design matrices.N. D. KoshevoyA. A. Beliaieva1414910.15588/1607-3274-2018-1-5METHOD OF NUMERICAL ANALYSIS OF THE PROBLEM OF STATIONARY FLOW PAST BODIES OF REVOLUTION BY VISCOUS FLUID
http://ric.zntu.edu.ua/article/view/131549
Context. The nonlinear stationary problem of flow past a body of revolution by a viscous incompressible fluid is examined in this article.<br />Objective. The purpose of this work is to develop a new method of numerical analysis of stationary problems of flow around bodies of<br />revolution by viscous incompressible fluid.<br />Method. The mathematical model of the process under consideration is a nonlinear boundary value problem for the stream function<br />obtained by the transition from the system of Navier-Stokes equations to one nonlinear equation of the fourth order. A special feature of the<br />formulation the task of the flow past body is that the boundary value problem is considered in an infinite region and both boundary conditions<br />on the boundary of the streamlined body and the condition at infinity are imposed for the stream function. Using the structural method (the<br />R-functions method), the task solution structure, that exactly satisfies all the boundary conditions of the task, and also guarantees the<br />necessary behavior of the stream function at infinity, is constructed. Two approaches are proposed to approximate the uncertain components<br />of the structure. The first approach is based on the use of the successive approximations method, which makes it possible to reduce the solution of the initial nonlinear task to the solution of a sequence of linear boundary value problems. These linear tasks are solved by the Bubnov-Galerkin method at each step of the iteration process. The second approach for approximating the uncertain components of the structure is based on the usage of the nonlinear Galerkin method and it is proposed to use it in the case of divergence of successive approximations. In this case, the solution of the initial nonlinear task reduces to solving a system of nonlinear algebraic equations.<br />Results. A computational experiment was carried out for the task of flow past a sphere, an ellipsoid of rotation and two articulated<br />ellipsoids for various Reynolds numbers.<br />Conclusions. The conducted experiments have confirmed the efficiency of the proposed method of numerical analysis of stationary<br />problems of flow around bodies of revolution by viscous incompressible fluid. The prospects for further research may consist in using the<br />method developed for the implementation of semi-discrete and projection methods for solving non-stationary problems.S. N. LamtyugovaM. V. SidorovI. V. Sytnykova1505710.15588/1607-3274-2018-1-6POLYINTERVAL MATHEMATICS AND OPTIMIZATION IN CONDITIONS OF UNCERTAINTY
http://ric.zntu.edu.ua/article/view/131556
Contex. In recent decades, in the civil and military spheres new information technologies are increasingly encountered based on new<br />approaches to describing various types of uncertainty. These technologies are widely used in engineering, economics, social sphere. To support them, new fairly powerful mathematical models and methods are needed. In this regard, this article devoted to the development of a new model of uncertainty (polyinterval) and mathematical methods and models for its study with regard to solving optimization problems under<br />uncertainty is very relevant.<br />Objective. The aim of the article is to elaborate a new mathematical model of uncertainty – a polyinterval which is a sequence of a finite<br />number of independent intervals of uncertainty in order to optimize various technical, economic, social and other systems with polyinterval<br />parameters.<br />Method. To achieve this goal, it is proposed to extend the method of introducing operations on intervals in the form of a set-theoretical<br />generalization of the corresponding operations over real numbers to the study of optimal operations over polyintervals.<br />Result. In the article a new mathematical model of non-definiteness is developed in detail – polyinterval. The optimal operations (max,<br />min) over the polyintervals have been determined and the rules for their implementation have been derived. The necessary and sufficient<br />conditions for the existence of these operations are established, i.e. the conditions for the comparability of polyintervals over the relations<br />“more” and “less”. An example of using the results obtained for making the optimal economic decision on choosing the best place of work by<br />the criterion “the highest salary” is given. It is shown that the polyinterval, which is a more complex model of uncertainty than the interval, allows one to investigate uncertain systems with the same time costs.<br />Conclusions. The scientific novelty of this work consists in the proposed by the author new mathematical model of uncertainty of various systems in the form of polyintervals, in conjunction with a mathematical apparatus that allows performing optimal operations on polyintervals and thereby enabling the optimization of technical, economic, social and other systems with polyinterval parameters.V.I. Levin1586410.15588/1607-3274-2018-1-7COMPUTER SIMULATION OF ELECTROMAGNETIC FIELD WITH APPLICATION THE FREQUENCY ADAPTATION METHOD
http://ric.zntu.edu.ua/article/view/131558
Context. A modern stage of powerful radio-electronic and electrotechnical systems development, with a power more than 1 MW, imposes increased requirements to their energy equipment, uninterrupted operation and power supply reliability in various operational modes. Field simulation of such systems class is based on modern numerical realization methods of boundary value problems for Helmholtz and Maxwell equations, both in single-connected and multi-connected domains. It imposes increased requirements to resources, computer hardware speed and software computing efficiency, defining the relevance of a new mathematical apparatus development or its elaboration, including combinations of analytical and approximate numerical methods.<br />Objective. The purpose of work is the elaboration a new numerical realization methods of field models taking into account AC<br />electrophysical processes with high frequency on the basis of Helmholtz equations in frequency formulations, adapted to software packages<br />use with a free license.<br />Method. A new method of frequency adaptation is elaborated, which provides systems of Helmholtz equations reduction in vector<br />magnetic potential formulations to the recurrent modified Maxwell’s equations, in analogies of DC formulation, and also provides high<br />precision and field simulation efficiency.<br />Results. The generalized spatial mathematical model of interrelated electromagnetic and electrothermal processes AC energy conversion<br />in current-conducting wires of powerful radio-electronic and electrotechnical systems is offered. This model considers operational modes, nonlinear dependences of electrophysical properties in electrotechnical materials, replacement effects and outer superficial effects, self- and mutual induction. A new method of frequency adaptation is elaborated, based on Helmholtz system of equations reduction in the vector magnetic potential formulations, in frequency domain, to the recurrent modified Maxwell’s equations, in analogies of DC formulation, and also provides high precision and field simulation efficiency. At numerical realization of frequency adaptation methods and finite elements, the number of freedom degrees decreases twice. It is caused by step-by-step solution the recurrent modified Maxwell’s equations, in analogies of DC formulations, for real and imaginary components of electric and vector magnetic potentials.<br />Conclusions. The elaborated new frequency adaptation method significantly expands possibilities of production design preparation for<br />powerful radio engineering systems. It allows using the software packages with a free license, reduces requirements to computing resources, reduces time costs and provides high precision in electromagnetic fields simulation.D. S. YarymbashS. T. YarymbashM. I. KotsurD. O. Litvinov1657410.15588/1607-3274-2018-1-8SIMULATION OF 3D TRANSIENT FLOW PASSING THROUGH AN INTESTINAL ANASTOMOSIS BY LATTICE-BOLTZMANN METHOD
http://ric.zntu.edu.ua/article/view/131559
Context. Recently, the number of reconstructive operations on the digestive tract has significantly increased. Such operations have<br />predictable negative consequences associated with disruptions of hydrodynamic processes in the anastomosis area. These negative consequences can be partially avoided by choosing anastomosis anatomical form based on mathematical modeling. Known mathematical models are cumbersome and do not allow to obtain results in real time. The proposed approach using lattice Boltzmann method allows solving this problem.<br />Objective. The purpose of the work is to develop a three-dimensional mathematical model of anastomosis for research of hydrodynamic<br />parameters of fluids with complex structure in real time.<br />Method. The method of constructing and analyzing the mathematical model of anastomosis of the digestive tract based on lattice<br />Boltzmann method is proposed. The method differs in that it provides simultaneous analysis of hydrodynamic parameters of the liquid and<br />determines the nature of movement of fine-grained inclusions in the anastomosis area. The main stages of the method are the development of technology for determining the modeling area, discretization of the three-dimensional Boltzmann equation with the choice of lattice and the nature of the collision operator, taking into account the complex structure of the liquid; development of the technology of transition from the density distribution function to the distribution of pressure at the mesoscopic level, taking into account the properties of the liquid, the creation of the process of transforming the set of mesoscopic parameters into the macroscopic parameters of the liquid. Results include determining the distribution of the velocity field in the anastomosis area to modify its geometry. The study of the<br />influence of gravity on the nature of motion of fine-grained inclusions has been carried out. The quantitative characteristics of the delay<br />of particles in the area of anastomosis, depending on the dynamic viscosity of the liquid, are determined.<br />Conclusions. The three-dimensional mathematical model discussed in this paper is based on the application of the lattice Boltzmann<br />method for calculating the hydrodynamic parameters of the motion of fluid in the study area. The distinctive feature of the model is that<br />it accounts for the complex nature of the liquid having fine-grained inclusions. The model allows determining the behavior of these<br />inclusions and the field of speed with sufficient accuracy in real time.M. A. NovotarskyiS. G. StirenkoY. G. Gordienko1758210.15588/1607-3274-2018-1-9THE METHODS FOR QUANTITATIVE SOLVING THE CLASS IMBALANCE PROBLEM
http://ric.zntu.edu.ua/article/view/131565
Context. The problem of recovery the classes’ balance in imbalanced samples is solved to increase the efficiency of diagnostic and<br />recognition models.<br />Objective. The purpose of the work is to modify the existing method of recovery classes’ balance and to conduct comparative analysis<br />of performance indicators with some modern methods.<br />Method. The proposed data preprocessing method is based on combining the undersampling and cluster-analysis technologies. The<br />method has allowed restoring the balance and reducing the sample while maintaining important topological properties of the sample, high<br />accuracy and acceptable operating time.<br />Results. The software that implements in proposed method has been developed and used in the computational experiments on the study<br />of method’s properties and comparative analysis with other methods of restoring classes’ balance.<br />Conclusions. The experiments confirmed the efficiency of the proposed method and its implemented software. The method has allowed<br />reducing the majority class to the size of the minority class, thus reducing the training sample (the sample is considered imbalanced if the size of the minority class is less than 10% of the original sample size), while demonstrating the best indicators of model accuracy and comparable sampling speed. It can be recommended for the practical application in solving problems of imbalance data for diagnostic and recognition models.D. А. KavrinS. A. Subbotin1839010.15588/1607-3274-2018-1-10DEVELOPMENT OF PERSONALIZATION SYSTEM OF SPECIALIZED WEB PORTAL
http://ric.zntu.edu.ua/article/view/131570
Context. The actual task of personifying a Web portal providing business services (telemedicine, consultations, remote monitoring,<br />distance education, etc.) has been solved.<br />Objective - development of a personalization system for a web portal that provides specialized services, which allows to take into account<br />preferences of users for the improvement of quality of service, an acceleration of information search, an exception of uninteresting pages, and а customer retention.<br />Method. The generalized process personalization model of Internet service is offered. The method of adaptation of the Web-resource<br />based on the combination of agent and neural network technologies is proposed in a model which automatically generates content for certain<br />categories of Internet users. The document object model of site in a graph form to search of relevant information was proposed that allows the site personalization. The use of multi-agent structure allowed to realize interaction of the components of the developed model. The method includes the following actions: automatic generation of hypotheses, which determines the presence or absence of target properties of the user; analysis of the user’s behavior on his surfing the Internet that allows to give more relevant results; construction of information portrait for collection statistically significant set of information characteristics for the purpose of planning of further actions; parallel clustering of users with use of the self-organizing Kohonen maps for the purpose of an acceleration of processing big data. The self-organizing Kohonen maps are adapted to symmetric multiprocessing system for accelerating computations. Thus, the configuration of the computing system shall be a multiple of the dimension of the input data for reduction of computation time.<br />Results. For the proposed models and method, software and a web interface are developed. They are used to realization computing<br />experiments to verification of the models, valuation of the adequacy and study the properties of the model and method.<br />Conclusions. The conducted experiments have confirmed the proposed models and methods. The use of a set of methods and tools can<br />be used in practice to promote goods and services in the network, to provide various services or individual parts of it, for business development.N. G. Axak1919910.15588/1607-3274-2018-1-11GENERALIZING OF THE MATHEMATICAL MODEL OF MICROPROGRAM FINITE STATE MACHINE ON COUNTER
http://ric.zntu.edu.ua/article/view/131572
Context. The problem of developing of structural modifications of the microprogram finite state machine on the counter has been solved,<br />which can help reduce hardware expenses in the logical circuit of the microprogram finite state machine in comparison with the known<br />structures.<br />Objective. The goal of the work is to generalize the structural features of the microprogram finite state machine on the counter using a<br />mathematical model based on the intermediate algebra of transitions.<br />Method. The known mathematical model of a microprogram finite state machine on a counter, based on the representation of the<br />transition function in the form of two partial functions, is analyzed. The use of an incremental counter in the structure of the finite state machine is expressed in this model by an intermediate algebra of transitions whose signature is formed by a single incremental function. In this case, the argument of the function is the code of the current state of the finite state machine, interpreted as an unsigned integer. For the considered mathematical model, a number of generalizations are made regarding the number of intermediate algebras of transitions, their signatures and carriers. Changes in the mathematical model and the structure of the finite-state machine on the counter, which are a<br />consequence of the generalizations made, are analyzed.<br />Results. On the basis of the generalizations made, a generalized structural scheme and a mathematical model of a microprogram finitestate machine with a noncanonical way of realizing the transition function are obtained. Experimental research of the effectiveness of the<br />developed generalized structure of MPA on the criterion of hardware costs has been carried out.<br />Conclusions. The results obtained in this paper can be used in the development of new structures and formal methods for the synthesis<br />of microprogram finite state machines with noncanonical realization of the transition function, oriented to optimizing the hardware expenses<br />in the logical circuit of the automaton.R. M. Babakov110010910.15588/1607-3274-2018-1-12AUTHENTICATION METHOD WPA/WPA2 KEY PARAMETERS’ DEFINITION FOR IEEE 802.11 BASED HONEYPOT
http://ric.zntu.edu.ua/article/view/131966
Context. An issue of correct configuration of honeypots is still opened, especially it is about honeypots that simulate wireless networks<br />as their clients are mobile and zone of control is not limited. Wrong configuration of honeypot may become its usage disinterested inside<br />automated system especially it is applicable to honeypots for IEEE 802.11 wireless networks. Honeypot with open (no authentication)<br />method or with low security may be suspicious for experienced attacker otherwise, it become easy prey for attackers whose goal is just access<br />to Internet. On the other hand, usage of honeypot with strong security level make no sense as well, as this model will become unconquerable<br />for attackers. Most protected access points use authentication method WPA2, usage of which may assure attacker that he/she attacks legitimate system.<br />Objective. The goal of the researching work is to develop diagnostic model for honeypots in IEEE 802.11 wireless networks, which is<br />conditionally secured by authentication method WPA/WPA2. Proposed model can help to assess possibility to leverage known WPA vulnerabilities by attacker on access point with given configuration.<br />Method. An evaluation method of attacker’s qualification and its technical set of equipment in way of WPA/WPA2 encryption key<br />selection for wireless honeypot is offered. Implementation of this method allows to reach load reduction on honeypot what will provide an<br />illusion of system authenticity for attacker. Method of distributed brute force attack on authentication method WPA/WPA2 that provides<br />diagnostic of Wi-Fi honeypot for encryption key resistance is offered. A Comparison between hardware virtualization and OS-level virtualization<br />is provided under the identical conditions in scope of WPA2 handshake brute force task.<br />Results. Optimal conditions for providing brute force attack in virtual environment are obtained, what can give possibility to quickly<br />assess security level honeypot. This information can be used to understand how qualified attacker should be.<br />Conclusions. A method of key perseverance assessment for authentication method WPA/WPA2 in IEEE 802.11 wireless network is<br />proposed, for interaction with attacker with needed qualification level and computing resources. A method of IEEE 802.11 wireless networks<br />security assessment using Analytics Hierarchy Process got further development. The scalable environment for honeypots assessment providing is offered. The method of wordlist generation and rotation that are delivered to assessment system is proposed, what can help to exclude key reduplication what in its turn will help to speedup of assessment results.R. I. Banakh111011810.15588/1607-3274-2018-1-13EVALUATION METHODS OF IMAGE SEGMENTATION QUALITY
http://ric.zntu.edu.ua/article/view/131972
Context. The basic methods of quantitative evaluation of image segmentation quality are explored. They are used to select segmentation algorithms for specific image classes. The object of the study is cytological and histological images that are used in diagnosing the pathological processes in oncology. The subject of the study is quantitative methods for segmentation algorithms’ quality evaluation.<br />Objective. The purpose of the work is to introduce the Gromov-Fr chet metric and develop a metric-based method for quantitative<br />evaluation of segmentation quality for image segmentation algorithms’ comparison.<br />Method. The quantitative evaluation criteria, which are based on comparison with etalon image and without the comparison with etalon<br />image, are analyzed. The algorithms for measuring the distances between images based on the Fr chet, Hausdorff, and Gromov-Hausdorff metrics are analyzed.<br />To calculate the distance between the contours of images, the Gromov-Fr chet distance was introduced. The condition of identity,<br />symmetry and triangle is proved, and it is shown that the Gromov-Fr chet distance is a metric. The metric-based method of quantitative evaluation of segmentation quality is developed. It is based on the use of the Gromov-Hausdorff and Gromov-Fr chet metrics. The method is based on the algorithms for non-convex-into-convex polygon transformation, weighted chord algorithm, and algorithms for calculating the Fr chet and Hausdorff distances. To calculate the Hausdorff distance between convex regions, the Atalah’s algorithm was used. The Thierry and Manillo algorithm was used to find the discrete Fr chet distance. These algorithms have the lowest computational complexity among their class of algorithms. <br />Results. The Gromov-Fr chet metric was introduced and the metric-based method of quantitative evaluation of segmentation quality was<br />developed.<br />Conclusions. The conducted experiments on the basis of cytological images confirmed the performance of software for evaluation the<br />distances between images. The developed method showed a high accuracy of estimation the distances between images. The developed software module was used in intelligence systems for diagnosing the breast precancerous and cancerous conditions. The software can be used in various software systems of computer vision. Promising areas for further research are search for new metrics to evaluate the distances between imagesO. M. BerezskyO. Y. Pitsun111912810.15588/1607-3274-2018-1-14DEGENERATE S-BOXES
http://ric.zntu.edu.ua/article/view/132063
Context. S-blocks are one of the main transformations of many ciphers, and the search for S-boxes with improved cryptographic indices<br />a great deal of attention in the literature of this direction is paid. Thus, it that there are permutations (S-blocks), which should be considered<br />bad is assumed, i.e. those that are not suitable for building reliable ciphers. On the other hand, one of the directions for improving the design of ciphers, which has been developing recently, with the construction of ciphers is connected, in which S-blocks of random type can be used. There is an important question. Which S-boxes are not suitable for building encryption transformations? In this connection, the study of the properties and features of the formation of S-blocks of degenerate structures, which are interpretations that degrade the cryptographic exponents of ciphers, is becoming increasingly important.<br />Objective. A study of the properties and features of the formation of permutations of a degenerate type, an estimate of the probability<br />of their generation with the aid of a random permutation generator. Determination of the characteristics by which degenerate substitutions can distinguished.<br />Method. Construction of the piecemeal laws of the distribution of the maxima of tables of differential differences and tables of linear<br />approximations for reduced models of ciphers, using different (degenerate) S-block constructions in them. Determination of the law of<br />distribution of maxima of XOR tables and shifts of tables of linear approximations of byte permutations.<br />Results. The ensemble characteristics of the set of byte substitutions are studied. Based on the study of the differential and linear<br />properties of the reduced models of ciphers, the characteristics by which degenerate substitutions can identified are determined. The probability<br />of random generation (by choice) of a byte substitution of a degenerate type is determined computationally and experimentally.<br />Conclusions. The results of the work confirmed that obtaining degenerate byte S-blocks for their random generation is an unlikely event. This means that almost without restrictions in the ciphers, S-blocks can used, generating with the help of the generator of random substitutions. The scientific novelty of the presented results is that the influence of degenerate permutations on the efficiency of encryption<br />transformations has studied. For the first time it established that, the use of S-blocks generated randomly in ciphers with a very high probability does not lead to a deterioration in the ciphers’ resistance to differential and linear cryptanalysis attacks.<br />The practical significance of the results of the work seen in the receipt of specific data confirming the main position of the new technique<br />developed to assess the stability of block symmetric ciphers to attacks of differential and linear cryptanalysis on the independence of cipher<br />strength indicators from the applied S-blocks, including S-blocks of random type.K. E. Lisickiy112913810.15588/1607-3274-2018-1-15THE TECHNIQUE OF HOMOTOPIC SKELETONIZATION OF BIT-MAPPED DRAWINGS OF PARTS OF SEA TRANSPORT
http://ric.zntu.edu.ua/article/view/132226
Context. Skeletonization is used in image processing of technical drawings, including drawings of sea transport parts, since the object’s<br />skeleton reflects its topological structure. Сomparative analysis of the best methods of parallel topological skeletonization of the area<br />objects, using spatial masks, showed that they give iterative distortions to the topology of primitives and their compositions. Therefore,<br />the task of developing a technique for homotopic skeletonization of bit-mapped drawings of sea transport parts is relevant.<br />Objective. To develope technique of improvement of topological equivalence of the skeletons to the сontour of sea transport parts,<br />by means of gradual correction of typical skeleton’s distortions.<br />Method. Сorrection of skeleton’s iterative distortions by modified spatial masks of the basic method of skeletonization and the reconstruction of the resulting skeleton by masks to restore its homotopy to the original, on the basis of developed reconstruction rules.<br />Execution of the proposed technique was carried out on example of the basic method R.Y. Wu & W.H. Tsai.<br />Results. The proposed technique is implemented as a program application that allows to perform quality skeletonization of images<br />of drawings of sea transport parts.<br />Conclusions. The shown examples of results of skeletonization of drawings of parts confirm efficiency of the proposed technique.<br />The technique can be adapted to the methods of topological skeletonization of area objects, based upon application of spatial masks.V. S. Molchanova113914810.15588/1607-3274-2018-1-16OPTIMAL CONTROLLING PATH DETERMINATION WITH THE HELP OF HYBRID OPTIONAL FUNCTIONS DISTRIBUTIONS
http://ric.zntu.edu.ua/article/view/132235
Context. The problem of the determination of the optimal value of the augmentation coefficient of a proportional governor included<br />into an inertness-less linear object control system on the basis of a synthesized model is solved. The object of the presented study is the<br />optimal control process.<br />Objective. The goal of the work is a creation of a method for a problematic situation of the optimum definition, evaluation, and<br />determination solving at the control system.<br />Method. A rough model of the phenomenon, and simplified dependence of optimal controlling trajectory upon the cost, of control in<br />an inertness-less linear controlling system equipped with a proportional governor are proposed. The accuracy of the behavior of the<br />investigated linear object of control has been chosen in the given consideration as an initial target value which needs to be minimized. The method of the model building with regards to an expenditures principle is offered. It provides taking into account the cost of controlling<br />process. It allows finding the optimal controlling value on the multi-optional basis. There applied a certain analogue to the subjective<br />entropy maximum principle of the subjective analysis in order to obtain a specific optimal distributions for the objective value in the view<br />of the composed functional. The method of the uncertainty degree of the options extremization is improved by a continuous optional value<br />introduction that allows forming the value distribution density. The optional synthesized model of the control process is built.<br />Results. The developed theoretical models allow obtaining, and have been implemented in, finding the hybrid optional density as an<br />optimal solution of a variational problem with two independent variables, which maximal value is the sought optimal controlling path<br />delivering minimum to the integrated expenses pertaining with the process.<br />Conclusions. The numerical experiments on the proposed methods studying in the problem of optimization are conducted. The<br />discovered dependencies are substantiated as a result of these experiments. Their use in practice makes it possible, and is recommended, to carryout optimal control in the described systems. The prospects for further research may include creations of models for the optimal control trajectories findings on conditions involving rates of the considered values varying and in probabilistic, stochastic, undetermined<br />problem settings.A. V. Goncharenko114915810.15588/1607-3274-2018-1-17ADAPTIVE OPTIMAL CONTROL SYSTEM OF ORE LARGE CRUSHING PROCESS
http://ric.zntu.edu.ua/article/view/132474
Context. The task of efficiency increase of power-hungry ore large crushing process by creation of optimal control system of it is<br />decided.<br />Objective is a improvement of control quality of ore large crushing process in conditions of information uncertainty about its state by<br />synthesis of optimal control based on identification of the process predictive model during control system functioning.<br />Method. It is developed the adaptive optimal control system of the ore large crushing process, which realizes the following procedures:<br />estimation of the controlled process state, its structural-parametric identification, prediction of the process progress, as well as synthesis<br />of optimal control. The solution of problem of synthesis of large crushing process optimal control is carried out during system functioning<br />by the principle of minimum of the generalized work on the sliding optimization interval with attraction of information about controlled<br />process state to the new interval of optimization and its future state by the predictive model that allows to simplify the solution of problem<br />of synthesis for nonlinear large crushing process and to compensate disturbances. The large crushing process identification is carried out by<br />definition of the operating mode and dimension of its state, based on which it is performed the model structure and parameters with the help<br />of composition of methods of global and local optimization that allows to increase the model accuracy.<br />Results. It is determined that for large crushing process the offered optimal control with prediction provides the decrease of the<br />control error in ~2 times and increase of productivity of the process of ore self-grinding, the next one in the technological line, (due to<br />stabilization of content of class +100 mm in its input ore) on 3.8%.<br />Conclusions. The scientific novelty of the work consists in development of adaptive system of large crushing process optimal control, in which the optimal control is formed in the course of functioning of control system by the principle of minimum of generalized work with the current estimation of the state of operated process and its future state by the predictive model that provides the control system invariance to the changes of operating modes of the equipment and the disturbing environment, and therefore, the improvement of control quality.<br />The practical significance of results of the work consists in development of algorithms of the current estimation and prediction of large<br />crushing process state, its identification and synthesis of optimal control realizing control system.V. I. KorniienkoS. M. MatsiukI. M. Udovyk115916510.15588/1607-3274-2018-1-18THE CONCEPT OF GUARANTEED SOLUTION THROUGH THE FUNCTIONAL FOR MUTIDIMENTIONAL KNAPSACK PROBLEM AND METHODS OF ITS CONSTRUCTION
http://ric.zntu.edu.ua/article/view/132481
Contex. The problem of constructing a guaranteed suboptimal (approximate) solution with respect to a functional in one-dimensional and multidimensional knapsack problems is considered. The object of the study was a model with an increment of the coefficients of the objective function.<br />Objective. The methods of constructing guaranteed suboptimal solution through the functional in one-dimensional and multidimensional<br />knapsack problem has been developed.<br />That is it is necessary to find such minimal changes coefficient of the objective function in the set of integer intervals so that the solution<br />found guarantees the value of the functional not less than the predetermined value.<br />Method. The concept of guaranteed solution and guaranteed suboptimal solution relative to the objective function in the satchel problem<br />is introduced. It is necessary to find such minimal changes coefficient of the objective function in the set of integer intervals so that the<br />solution found guarantees the value of the functional not less than the predetermined value. Such kind of solution we name as guaranteed<br />solution through the functional for one-dimensional and multidimensional knapsack problem. The methods of their construction has been developed. A software package was developed to find these solutions and numerous computational experiments were performed on random large-dimensional problems.<br />Results. The algorithm of constructing guaranteed suboptimal solution through the functional in one-dimensional and multidimensional<br />knapsack problem has been developed.<br />Conclusions. A software package was developed to find the concept of guaranteed solution and guaranteed suboptimal solutions and<br />numerous computational experiments were performed on random large-dimensional problems.К. Sh. MamedovN. N. Mamedov116617310.15588/1607-3274-2018-1-19CONTROL OF TECHNICAL SYSTEMS BASED ON PREDICTION OF THEIR INDIVIDUAL RESOURCE
http://ric.zntu.edu.ua/article/view/132484
Contex. The actual task of forecasting an individual resource of a variety of design and design of technical systems was solved.<br />Objective. The purpose of the work is to develop a methodology for managing the operation of complex technical systems based on<br />the forecasting of their individual resource.<br />Method. Modern management methods allow you to make advance management decisions to prevent accidents and the consequent<br />technogenic catastrophes. These decisions are based on extrapolating the value of the monitored signal to the maximum permissible level.<br />However, the norms are compiled based on average statistical data, which can only relate to a controlled sample of the machine with a<br />certain degree of probability. This is the cause of errors in predicting the moment when this sample is stopped for repairs. This problem is<br />especially urgent for complex and responsible technical systems manufactured in small series or even in single specimens. Such systems do not have statistical data to create these norms.<br />To solve this problem, another management methodology was developed that excludes the extrapolation procedure and allows<br />determining the operating time of the technical system prior to repair based on the identification results of the model, describing the time<br />variation of the value of the monitored parameter<br />Results. The methodology of management of technical systems is developed, ensuring the control of their current technical condition<br />based on information on their individual resource. The methodology was used to control the gradual deterioration of the technical state of<br />the hydro turbine, which resulted in its catastrophic destruction.<br />Conclusions. The performed calculations confirmed the efficiency of the proposed methodology for managing the operation of<br />technical systems based on the forecasting of their individual resource, which makes it possible to recommend it for use in practice when<br />solving problems of controlling the operation of complex technical systems, thus preventing their accidents, often leading to man-made<br />disasters. Prospects for further research will be the development of a forecasting - diagnostic complex, the software of which reflects the<br />algorithm for applying the developed methodology of forecasting an individual resource of various designs and designation of technical<br />systems.V. V. NahornyE. A. LavrovN. A. FedotovaE. G. Kuznetsov117418210.15588/1607-3274-2018-1-20IMPROVEMENT OF A SYSTEM CONTROLLING A PROCESS OF RAILCARS UNLOADING IN THE CONTEXT OF CHANGES IN TEMPERATURE MODE WHILE OPERATING
http://ric.zntu.edu.ua/article/view/132502
Context. The problems of cost minimizing for the delivery of raw materials, fuel and materials, while meeting all the requirements of end<br />user in terms of transportation, condition, quality and amount of the cargo, the compliance of the rolling stock with the equipment of<br />unloading points, etc. are still the key problems of efficient transportation management. A problem to improve a system controlling a process of cargo operations performance at industrial enterprises during the cold season, when well-managed process is considerably complicated by the influence of stochastic fluctuations in the environmental temperature remains to be topical one. Delivery cost experiences significant increase due to the growth of power consumption for the cargo defrosting.<br />The objective of the paper is to improve a system controlling a process of railcars unloading in terms of expectations of the negative<br />changes in the temperature mode owing to optimization of the railcars distribution among the unloading points by the criterion of the idle time<br />minimization.<br />Method. Two temperature modes are singled out: standard operating mode in terms of positive temperatures and a mode of necessity to<br />recover looseness of frozen cargos. The method of operative disbalance of incoming cargo flows has been developed to provide more rational<br />distribution of cargos within cargo loading/unloading complexes during the periods of temperature changes being typical for Ukrainian climate.<br />A new procedure to solve dynamic transportation problem with the varying intensity factor of incoming cargo flows in terms of time has been developed. A factor of minimum period for cargo operation has been proposed as an optimization criterion.<br />Results. Methodology has been developed basing upon a method of operative disbalance of incoming cargo flows. Experiments concerning<br />the methodology application have been carried out to improve the system controlling the process of railcars unloading in terms of changes in temperature mode.<br />Conclusions. Analysis of the research results has shown that the proposed approach decreases significantly the idle time of the railcars<br />in terms of temperature mode changes, reduces expenses connected with the railcars use as well as the expenses connected with the recovery<br />cargo looseness and operation of locomotives.S. M. TurpakI. O. TaranO. O. Ostrohliad118319110.15588/1607-3274-2018-1-21STATIC OPTIMIZATION OF RECTIFICATION PROCESSES USING MOBILE CONTROL ACTIONS
http://ric.zntu.edu.ua/article/view/132505
Context. The actual task of multi-criteria static optimization of rectification processes with the use of mobile control actions that consist<br />in changing the place of input of raw materials into a column is solved, and the efficiency of their use in various static modes of the process<br />is investigated.Objective – increasing the productivity of the process of rectification and reducing the energy costs by using mobile control actions and a multi-criteria approach to the calculation of their optimal values.<br />Method. Methods are proposed for calculating the optimum feed plate together with calculations of the optimal values of traditional<br />control actions – steam flow to the column cube and the yield of the target product – based on the criteria for maximizing productivity and<br />minimizing energy consumption using the normalized optimization criterion. Calculations are carried out using a nonlinear mathematical<br />model of the process, describing the heat and mass transfer processes on each column contact device. Calculation of the optimal point at the<br />boundary of the working region of the rectifying column in the coordinates of traditional control actions is suggested to be carried out by the method of secants. Since the magnitude of the desired mobile control action can only take on discrete, integer values, a scanning method is proposed to solve the optimization problem.<br />Results. The developed optimization method was used to calculate the optimal static regimes of the rectification column for separating the<br />methanol-water mixture when the values of the model parameters vary widely. Extremal dependence on the magnitude of the mobile control<br />action of both individual criteria and a normalized optimization criterion is proved. The results of the simulation showed that the increase in<br />productivity achieved by the use of mobile control actions is 1 to 5%, while the heat savings in the reboiler of the column are 6–8%.<br />Conclusions. The carried out researches have proven the effectiveness of the multi-criteria approach to the solution of the problem of<br />static optimization of rectification processes using mobile control actions, which allows using it in practice. The proposed methods of static<br />optimization are applicable for processes of multicomponent, complex rectification. Further research in this direction include the development<br />of methods and algorithms of the static optimization of rectification processes using continuous mobile control actions, mobile actions with<br />two degrees of freedom, modeling of transient responses in rectification columns at mobile control.A. R. SheikusV. Ya. Trishkin119220110.15588/1607-3274-2018-1-22