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  7. 2021 год
  8. 43-1

Electronic modeling

Vol 43, No 1 (2021)

 

CONTENTS

Mathematical Modeling and Computation Methods

  SHEVCHENKO S.S.
Mathematical Model and Calculation Method of a Shaftless Pump with Seals-Bearings
3-16
  PILKEVYCH I.A., BOYCHENKO O.S., LOBODA V.V., GLADICH R.I.
Mathematical Model As-Sessment of Knowledge Level Users Information and Telecommuni-Cation System
17-27

Computational Processes and systems

  EFANOV D.V., SAPOZHNIKOV V.V., SAPOZHNIKOV Vl.V.
The Self-Checking Concurrent Error-Detection Systems Synthesis Based on the Boolean Complement to the Bose-Lin Codes with the Modulo Value M=4
28-45

Application of Modeling Methods and Facilities

  ZHARKIN A.F., NOVSKIY V.O., POPOV V.A., YARMOLIUK O.S., HAWKAR AHMED NOORY.
Review of Technologies for Controlling the Modes of Operation of 6 ... 20 kV Electrical Networks with Distributed Energy Sources
46-66
  BAKALYNSKYI O., TSYPLYNSKYI Yu., NECHAYEVA I., DUBOK V.
The Results of a Statisti-Cal Study of the State of Cyber Protection of the Critical Infor-Mation Infrastructure of Ukrainer
67-80
  VASYLIUK Y., ZINCHENKO Y., GNATIUK S., SOFIIENKO I., PETROVA D.
Use of Modern Shielding Properties Materials for Technical Protection of Infor-Mation
81-96
  ZUBOK V.Yu.
Empirical Results of Forming an Effective Topology in the Internet Based on the Global Routing System Security Assessments
97-106
  TAGHIYEVA A.D.
Approach to the Solution of the Optimum Control Problem of the Water Supply System
107-116 
  UZDENOV T.A.
Simulator of Task Sheduling in Geographically Distributed Computer Systems with Non-Alienable Resources
117-129 

MATHEMATICAL MODEL AND CALCULATION METHOD OF A SHAFTLESS PUMP WITH SEALS-BEARINGS

S.S. Shevchenko, A.S. Shevchenko

Èlektron. model. 2021, 43(1):03-16

ABSTRACT

Groove seals, in addition to their main purpose, which is to limit the crossflows between cavities with different pressures, can be used as rotor supports. An example of the use of groove seals as supports are shaftless pumps. A model of a shaftless pump has been constructed, demonstrating its advantages, which are the absence of contacts between a rotating impeller and a stationary casing. The static and flow characteristics of the pump with seals-bearings has been built. An analysis of the dynamics of a shaftless cradle-mounted pump with a combined support-balancing and sealing unit was carried out, which showed that the pump has a sufficient margin of vibration reliability.

KEYWORDS

seals-bearings, shaftless pump, static computation, vibration characteristics.

REFERENCES

  1. Gorovoy, S.A. (1996), “Development and research of designs of shaftless centrifugal pumps”, Proceedings of the VIII International Sci. conf. PUMPS-96, Vol. 2, pp. 232-241, Sumy, Rizocentr SSU.
  2. Kundera, Cz. and Martsinkovsky, V.А. (2014), “Static and dynamic analysis of a pump impeller with a balancing device. Part 1: Static analysis”, J. of Applied Mechanics and Engineering, Vol. 19, No. 3, pp. 609-619.
    https://doi.org/10.2478/ijame-2014-0042
  3. Jędral, W. (2001), Pompy wirowe [Rotodynamic Pumps], Wydawnictwo Naukowe PWN, Warsaw, Poland.
  4. Martsinkovsky, V.A. (1980), Beskontaktnyye uplotneniya rotornykh mashin [Non-contact seals for rotary machines], Mashinostroyeniye, Moscow, USSR.
  5. Martsinkovsky, V.A. and Shevchenko, S.S. (2018), Nasosy atomnykh elektrostantsiy: raschet, konstruirovaniye, ekspluatatsiya [Pumps of nuclear power plants: calculation, design, operation], Universitetskaya kniga, Sumy, Ukraine.
  6. Marcinkowski, W. and Kundera, Cz. (2008), Teoria konstrukcji uszczelnien bezstykowych [Theoryof constructionof non- contact sealing], Wyd-wo Politechniki Swiętokrzyskiej, Kielce, Poland.
  7. Martsinkovsky, V., Zhulyov, A. and Kundera, Cz. (2014), “Static and dynamic analysis of a pump impeller with a balancing device. Part 11: Dynamic analysis”, J. of Applied Mechanics and Engineering, Vol. 19, No. 3, pp. 621-631.
  8. Marcinkowski, W. and Korczak, A. (2004), “Szczeliny tarczy odciążającej napór osiowy i ich wplyw na dynamikę zespolu wirującego pompy odśrodkowej wielostopniowej”, X Int. Conf. Seals and Sealing Technology in Machines and Devices, Wroclaw, SIMP, 2004, рp. 318-328.
    https://doi.org/10.2478/ijame-2014-0043
  9. Gudkow, S., Marcinkowski, W., Korczak, A. and Kundera, Cz. (2013), “Pompa odśrodkowa z wirnikiem łożyskowanym w szczelinach uszczelniających”, X1II Int. ScientificTechnical Conference. Seals and Sealing Technology of Machines and Dewices, Wroclaw, SIMP, pp. 178-187.
  10. Martsinkovsky, V.A. (2012), Dinamika rotorov tsentrobezhnykh mashin [Dynamics of rotors of centrifugal machines], Izdatelstvo SumGU, Sumy, Ukraine.

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MATHEMATICAL MODEL ASSESSMENT OF KNOWLEDGE LEVEL USERS INFORMATION AND TELECOMMUNICATION SYSTEM

I.A. Pilkevych, O.S. Boychenko, V.V. Loboda, R.I. Gladich

Èlektron. model. 2021, 43(1):17-27

ABSTRACT

The regulatory documents regulating issues of information protection in information and telecommunication systems have been analyzed. The purpose of scientific research is to assess the level knowledge of users the information and telecommunication system based on the results of their test tasks. To achieve it, methods modern test theory were applied and initial data were determined. It is proposed for assessment level knowledge of users information-telecommu­nication system using scale of test results. The limits the test results scale are defined, which depend on the number of qualitative measures level knowledge assessment. The mathematical dependence test complexity on the number of tasks different level complexity is shown. A mathematical model for assessing the level knowledge of users information and telecommunication system has been developed, which takes into account the quality of response to tasks different levels complexity. The adequacy of the developed mathematical model for three users was checked, according to the results test, it was established that a qualitative response to tasks of the highest level complexity provides a large quantitative assessment of the level knowledge. An example of determining the limits the test results scale for three qualitative indicators of the knowledge level users the information and telecommunication system is given.

KEYWORDS

internal intruder, model of intruder, information protection, mathematical model.

REFERENCES

  1. Order of the Department of Special Telecommunication Systems and Information Protection Security Services of Ukraine №. 22 dated April 28, 1999, “General provisions to protect information in computer systems from unauthorized access”, ND TZI 1.1-002-99, available at: http://dsszzi.gov.ua/dsszzi/doccatalog/document?id=106340, (accessed: May 12, 2020).
  2. Order of the Department of Special Telecommunication Systems and Information Protection of the Security Service of Ukraine № 125 dated November 08, 2005, “Procedure for work on the creation of an integrated information protection system in the information and telecommunications system”, LP TSO 3.7-003-05, available at: http://www.dsszzi.gov.ua/ control/uk/publish/article?art_id=46074, (accessed: May 12, 2020).
  3. Resolution of the Cabinet of Ministers of Ukraine № 373 dated March 29, 2020, “On approval of the Rules for Ensuring the Protection of Information in Information, Telecommunication and Information-Telecommunication Systems”, available at: http:// www.zakon.rada.gov.ua/ laws/show/373-2006 -% DO, (accessed: May 12, 2020).
  4. Order of the Department of Special Telecommunication Systems and Information Protection of the Security Service of Ukraine № 53 dated December 04, 2000, “Standard provision on the information protection service in an automated system", LP TSO 1.4-001-2000, available at: http://www.tzi.com.ua/downloads/1.4-001-2000.pdf, (accessed: May 12, 2020).
  5. Panchenko, V.A. (2018), “Mechanism against insiders in the personnel security system”, Naukovyy visnyk Lʹvivsʹkoho derzhavnoho universytetu vnutrishnikh sprav, Vol. 1, pp. 219-
  6. Boychenko, A.S., Gumenyuk, I.V. and Gladich, R.I. (2019), “Mathematical model for assessing the risk of unauthorized access to information by users of the information and telecommunications system”, Problemy stvorennya, vyprobuvannya, zastosuvannya ta ekspluatatsiyi skladnykh informatsiynykh system, Vol. 16, pp. 124-135.
    https://doi.org/10.46972/2076-1546.2019.16.12
  7. Boychenko, A.S. and Zyubina, R.V. (2019), “Method of calculating the probability of implementing restricted access information threats from an internal violator”, Bezpeka informatsiynykh system ta tekhnolohiy, Vol. 1, № 1, pp. 19-26.
    https://doi.org/10.17721/ISTS.2019.1.19-26
  8. Komarov, M.Yu., Oniskova, A.V. and Gonchar, S.F. (2018), “Analysis of the study of the model of an information security violator for a secure Internet access node”, Vcheni zapysky TNU im. V.I. Vernadsʹkoho. Seriya: tekhnichni nauky, Vol. 29, № 68, pp. 138-
  9. Lisova, T.V. (2012), Models and methods of modern test theory, Vydavetsʹ PP Lysenko M.M., Nizhyn, Ukraine.
  10. Fedoruk, P.I. (2007), “Adaptive tests: statistical methods for analyzing the results of test knowledge control”, Matematychni mashyny i systemy 3, № 4, pp. 122-138.
  11. Rasch, G. (1980), Probabilistic Models for Some Intelligence and Attainment Tests, The University of Chicago Press, Chicago, US.
  12. Pogrebnyuk, I.M. and Tomashevsky, V.M. (2013), “Modeling of adaptive learning scenarios using Petri networks”, Visnyk NTUU «KPI» Informatyka, upravlinnya ta obchyslyuvalʹna tekhnika, 55, pp. 38-45.
  13. Ivokhin, E.V. and Makhno, M.F. (2015), “Development of adaptive testing and automatic assessment of knowledge”, Visnyk Kyyivsʹkoho natsionalʹnoho universytetu im. Tarasa Shevchenka. Seriya fizyko-matematychni nauky, 1, pp. 130-133.
  14. Paseka, M.S. (2015), “Processing data of adaptive training and testing of students of a higher educational institution”, Naukovyy visnyk NLTU Ukrayiny, Vol. 25, № 4, pp. 400-407.
  15. Fetisov, V.S. and Chernysheva, E.A. (2011), “Software tools for substantiating the quality of test tasks”, Naukovi zapysky NDU im. M. Hoholya. Psykholoho-pedahohichni nauky, Vol. 10, pp. 106-110.
  16. Sokolov, A.Yu. and Molchanova, A.G. (2011), “Methods of evaluating test results in automated training systems”, Radioelektronni i komp'yuterni systemy, 1, № 49, pp. 117-123.
  17. Rakov, S.A., Mazorchuk, N.S. and Bondarenko, E.A. (2013), “Algorithm for adjusting test scores based on the analysis of the complexity of tasks”, Informatsiyni tekhnolohiyi v osviti, Vol. 16, pp. 49-56.
    https://doi.org/10.14308/ite000426
  18. Shumeyko, A.O., Iskandarova-Malaya, A.O. and Limar, N.M. (2018), “On calculating the complexity of tasks”, Matematychne modelyuvannya, Vol. 2, № 39, pp. 58-65.
  19. Alekseev, O.M., Konovalova, N.A., Lozovaya, K.A. and Trofimenko, P.E. (2015), “The significance and complexity of test tasks in assessing the activities of university teachers”, Visnyk KNUTD, Seriya Tekhnichni nauky, 2, № 84, pp. 240–246.
  20. Melnik, A.M., Pasechnik, R.M. and Shevchuk, R.P. (2011), “Information technology for automatic generation of test tasks with controlled complexity”, Systemy obrobky informatsiyi, Vol. 3, № 93, pp. 57-61.

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The Self-Checking Concurrent Error-Detection Systems Synthesis Based on the Boolean Complement to the Bose-Lin Codes with the Modulo Value M = 4

D.V. Efanov, Doctor of Science (Tech.)
Federal State Autonomous Educational Institution of Higher Education
“Russian University of Transport”
Russian Federation, 127994, Moscow, Obraztsova str., build. 9/9,
contact phone number (+7) (911) 709 21 64, e-mail: This email address is being protected from spambots. You need JavaScript enabled to view it.
V.V. Sapozhnikov, Doctor of Science (Tech.),
Vl.V. Sapozhnikov, Doctor of Science (Tech.),
Federal State Budgetary Educational Institution of Higher Education
“Emperor Alexander I St. Petersburg State Transport University”
Russian Federation, 190031, St. Petersburg, Moskovsky ave., 9,
contact phone number (+7) (812) 457 85 79, e-mail: This email address is being protected from spambots. You need JavaScript enabled to view it.

Èlektron. model. 2021, 43(1):28-45

ABSTRACT

The presented paper is devoted to the development of the Boolean complement method for the organization of the self-checking concurrent error-detection (CED) systems for digital devices. The article considers the features of using the modular sum codes (Bose-Lin codes) for these purposes, especially the Bose-Lin code by the modulo M = 4. This code has two check bits and only four different check vectors, this makes it easier to use it in the organization of the self-checking CED system. The article presents the block diagrams of the organization of the CED system by the method of Boolean complement to the considered modular sum code. The examples of the CED system synthesis by the Boolean complement method are given. The article defines the restrictions imposed on the CED systems synthesis procedure, and also forms an algorithm for synthesizing a self-checking CED systems by the method of the Boolean complement to the Bose-Lin code by the modulo M = 4.

KEYWORDS

self-checking discrete device; self-checking concurrent error-detection systems; duplication method; Boolean complement method; Bose-Lin code; testability.

REFERENCES

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REVIEW OF TECHNOLOGIES FOR CONTROLLING THE MODES OF OPERATION OF 6...20 KV ELECTRICAL NETWORKS WITH DISTRIBUTED ENERGY SOURCES

A.F. Zharkin, V.O. Novskiy, V.A. Popov, O.S. Yarmoliuk, Hawkar Ahmed Noory

Èlektron. model. 2021, 43(1):46-66

ABSTRACT

An overview of the statements and methods for implementing the problem of distribution networks reconfiguration, as one of the most effective organizational measures to reduce electrical energy losses, is presented. Various formulations of this problem and optimization methods used for its solution are analyzed considering its as a medium-term planning problem, when the optimal disconnection points were determined for the most characteristic seasons of the year. It is shown that in modern power supply systems under the conditions of widespread implementation of distributed generation energy sources and storage units, the use of electric vehicles, the solution of this problem within the framework of the traditional approach loses its effectiveness. It is shown that in this case it is necessary to use the dynamic reconfiguration of distribution networks. Here one of the possible ways is associated with the use of remotely controlled switching devices. An algorithm that allows one to choose the optimal locations and operating mode of switches with remote control, for electrical energy losses minimization, taking into account the switching resource, is proposed. It has been demonstrated that this technical solution is justified in the case of cyclic and sufficiently long-term changes in loads, output power of distributed energy sources, when turning on/off storage devices. It is shown that a more universal solution is the use of power electronics, which makes it possible to form the so-called “soft” open points of the distribution network circuits. Under these conditions, it becomes possible to realize the real time control of the active and reactive power flows, ensuring the minimization of electrical energy losses.

KEYWORDS

electrical distribution networks, mode of operation control, distributed generation, remotely controlled switching devices, soft open points.

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