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<article xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:ali="http://www.niso.org/schemas/ali/1.0/" article-type="research-article" dtd-version="1.2" xml:lang="en"><front><journal-meta><journal-id journal-id-type="publisher-id">Journal of Samara State Technical University, Ser. Physical and Mathematical Sciences</journal-id><journal-title-group><journal-title xml:lang="en">Journal of Samara State Technical University, Ser. Physical and Mathematical Sciences</journal-title><trans-title-group xml:lang="ru"><trans-title>Вестник Самарского государственного технического университета. Серия «Физико-математические науки»</trans-title></trans-title-group></journal-title-group><issn publication-format="print">1991-8615</issn><issn publication-format="electronic">2310-7081</issn><publisher><publisher-name xml:lang="en">Samara State Technical University</publisher-name></publisher></journal-meta><article-meta><article-id pub-id-type="publisher-id">41992</article-id><article-id pub-id-type="doi">10.14498/vsgtu1756</article-id><article-categories><subj-group subj-group-type="toc-heading" xml:lang="en"><subject>Articles</subject></subj-group><subj-group subj-group-type="toc-heading" xml:lang="ru"><subject>Статьи</subject></subj-group><subj-group subj-group-type="article-type"><subject>Research Article</subject></subj-group></article-categories><title-group><article-title xml:lang="en">Research of a retrial queueing system with exclusion of customers and three-phase phased by follow-up</article-title><trans-title-group xml:lang="ru"><trans-title>Исследование RQ-системы с вытеснением заявок и трехфазным пофазовым дообслуживанием</trans-title></trans-title-group></title-group><contrib-group><contrib contrib-type="author"><name-alternatives><name xml:lang="en"><surname>Nazarov</surname><given-names>Anatolii Andreevich</given-names></name><name xml:lang="ru"><surname>Назаров</surname><given-names>Анатолий Андреевич</given-names></name></name-alternatives><bio xml:lang="en"><p>Doctor of technical sciences, Professor</p></bio><bio xml:lang="ru"><p>доктор технических наук, профессор</p></bio><email>anazarov@fpmk.tsu.ru</email><xref ref-type="aff" rid="aff1"/></contrib><contrib contrib-type="author"><name-alternatives><name xml:lang="en"><surname>Izmailova</surname><given-names>Yana Evgenevna</given-names></name><name xml:lang="ru"><surname>Измайлова</surname><given-names>Яна Евгеньевна</given-names></name></name-alternatives><bio xml:lang="en"><p>Candidate of physico-mathematical sciences, no status</p></bio><bio xml:lang="ru"><p>кандидат физико-математических наук, без звания</p></bio><xref ref-type="aff" rid="aff1"/></contrib></contrib-group><aff-alternatives id="aff1"><aff><institution xml:lang="en">Tomsk State University</institution></aff><aff><institution xml:lang="ru">Национальный исследовательский Томский государственный университет</institution></aff></aff-alternatives><pub-date date-type="pub" iso-8601-date="2020-07-31" publication-format="electronic"><day>31</day><month>07</month><year>2020</year></pub-date><volume>24</volume><issue>2</issue><issue-title xml:lang="en">VOL 24, NO2 (2020)</issue-title><issue-title xml:lang="ru">ТОМ 24, №2 (2020)</issue-title><fpage>331</fpage><lpage>342</lpage><history><date date-type="received" iso-8601-date="2020-08-04"><day>04</day><month>08</month><year>2020</year></date></history><permissions><copyright-statement xml:lang="en">Copyright ©; 2020, Samara State Technical University</copyright-statement><copyright-statement xml:lang="ru">Copyright ©; 2020, Самарский государственный технический университет</copyright-statement><copyright-year>2020</copyright-year><copyright-holder xml:lang="en">Samara State Technical University</copyright-holder><copyright-holder xml:lang="ru">Самарский государственный технический университет</copyright-holder><ali:free_to_read xmlns:ali="http://www.niso.org/schemas/ali/1.0/"/><license><ali:license_ref xmlns:ali="http://www.niso.org/schemas/ali/1.0/">https://creativecommons.org/licenses/by/4.0</ali:license_ref></license></permissions><self-uri xlink:href="https://journals.eco-vector.com/1991-8615/article/view/41992">https://journals.eco-vector.com/1991-8615/article/view/41992</self-uri><abstract xml:lang="en"><p>In this paper, we consider a retrial queueing system (RQ-system) which receives to the input a Poisson flow with a given intensity. If at the time of customer the server is busy, the displacement of customer standing on the server takes place. Customers that do not have time to be successfully serviced go into orbit, in order to, after an accidental exponential delay, again turn to the server for maintenance. It is shown that the limiting characteristic function of the number of customers in the orbit and the states of the server converges to a three-dimensional Gaussian distribution. The mean vector and covariance matrix are obtained for this distribution. A stationary probability distribution of the server states is also found.</p></abstract><trans-abstract xml:lang="ru"><p>Рассмотрена система с повторными вызовами (RQ-система), на вход которой поступает простейший поток с заданной интенсивностью. Если в момент обращения заявки прибор занят, то происходит вытеснение заявки, стоящей на приборе. Заявка, не успевшая успешно обслужиться, переходит на орбиту, чтобы после случайной экспоненциальной задержки вновь обратиться к прибору для обслуживания. Дообслуживание заявки подразумевает, что в момент обращения с орбиты к прибору заявка встает на ту фазу обслуживания, с которой была прервана. Показано, что асимптотическая характеристическая функция числа заявок на орбите и состояний прибора сходится к трехмерному гауссовскому распределению. Для данного распределения получен вектор средних значений и матрица ковариаций. Найдено стационарное распределение вероятностей состояний прибора.</p></trans-abstract><kwd-group xml:lang="en"><kwd>retrial queueing system</kwd><kwd>exclusion of customers</kwd><kwd>three-phase service</kwd><kwd>follow-up customers</kwd><kwd>Gaussian approximation</kwd><kwd>asymptotic analysis</kwd></kwd-group><kwd-group xml:lang="ru"><kwd>система с повторными вызовами</kwd><kwd>вытеснение заявок</kwd><kwd>трехфазное обслуживание</kwd><kwd>дообслуживание заявок</kwd><kwd>гауссовская аппроксимация</kwd><kwd>асимптотический анализ</kwd></kwd-group></article-meta></front><body></body><back><ref-list><ref id="B1"><label>1.</label><mixed-citation>Yang T., Templeton J.G.C., "A survey on retrial queue", Queueing Syst., 1987, 201–233</mixed-citation></ref><ref id="B2"><label>2.</label><mixed-citation>Falin G. I., "A survey of retrial queues", Queueing Syst., 7 (1990), 127-168</mixed-citation></ref><ref id="B3"><label>3.</label><mixed-citation>Falin G. I., Templeton J.G.C., Retrial Queues, Chapman and Hall, London, 1997, 338 pp.</mixed-citation></ref><ref id="B4"><label>4.</label><mixed-citation>Artalejo J. R., Choudhury G., "Steady state snalysis of an M/G/1 queue with repeated attempts and two-phase service", Quality Technology and Quantitative Management, 1:2 (2004), 189-199</mixed-citation></ref><ref id="B5"><label>5.</label><mixed-citation>Choudhury G., Deka K., "An M/G/1 retrial queueing system with two phases of service subject to the server breakdown and repair", Performance Evaluation, 65:10 (2008), 714-724</mixed-citation></ref><ref id="B6"><label>6.</label><mixed-citation>Ke J. C., Choudhury G., "A batch arrival retrial queue with general retrial times under Bernoulli vacation schedule for unreliable server and delaying repair", Appl. 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