Research of impact input rate random variations on macroscopic characteristics of non-stationary queuing system

The results of research of input stream rate random variations influence on the macroscopic characteristics of a nonstationary queuing system (NQS) are discussed in this paper. Statistical information obtained during the football match between the football clubs "Krylia Sovetov" and "Dynamo" at the stadium "Metallurg" in Samara is available. The characteristics of the stochastic component of the variation in the input rate were chosen on the basis of this information. The probability density function and the cumulative distribution function of random variations in the input rate of applications were estimated using the Rosenblatt-Parzen approximation. NQ's characteristics was studied such as the maximum queue length, the maximum waiting time in the queue, the time point at which the maximum queue length is reached, and the time point at which waiting time in the queue the longest, the number of visitors who entered at the time of the match beginning, the time needed to service the entire queue. The results of the statistical simulation shown that taking into account the random component of the variation input rate does not affect this macroscopic characteristics. © Published under licence by IOP Publishing Ltd

Modernization of university training in it and telecom technologies and problems of adaptation in the labor market

В настоящей статье предпринята попытка проанализировать проблемные ситуации, сложившиеся на рынке труда специалистов по информационным технологиям в 2009 и 2010 гг., определить тенденции, формирующиеся на рынке IT-специалистов и сформулировать предложения по развитию системы подготовки ІТ-специалистов.This article attempts to: analyze the problematic situation in the labor market in Information Technology in 2009 and 2010, identify the trends emerging on the market of IT-specialists, formulate a proposals for the development of training IT- specialists

Цифровизация российской высшей школы: технологии образовательного процесса (опыт вузов Уральского федерального округа Российской Федерации)

The Russian higher school is in constant transformation, which is associated with the entry of the Russian Federation into the world market of educational services. To achieve the goals of positioning Russian universities in world rankings, various federal projects are being created, for example, within the framework of the state program “Development of Education” for 2019-2025, the project “Modern Digital Educational Environment in the Russian Federation” has been developed. To analyze the readiness of Russian universities for digital transformation, a study was conducted in which students of universities of the Ural Federal District (N = 300) took part, who evaluated the degree of implementation of various digital technologies in the educational process at the moment. It is for students as the main consumers of educational services to master the digital components of the educational process, to use technical means. The results of the study revealed the high willingness of students to work in a digital educational environment, the use of distance learning. Moreover, a higher level of readiness was demonstrated by students of technical and IT areas. At the same time, a contradiction was revealed between the readiness of students and their perception of the technical equipment of universities and the willingness of teachers to carry out the educational process in the new digital environment. Obviously, the use of centralized digital technologies (included by universities in the educational process) is significantly inferior to the students' spontaneous development of instant messengers, smartphone applications, and other software that facilitates the development of courses and disciplines (initiated by students on their own). Thus, to implement state programs to create a digital educational environment, it is necessary to strengthen the technical infrastructure of universities and improve the qualifications of teachers for the effective implementation of digitalization processes in higher education. © 2020 LLC Ecological Help. All rights reserved

OVERVIEW OF CLOUD PLATFORMS FOR THE IMPLEMENTATION OF AN INTERACTIVE PRACTICAL COMPLEX ON THE DISCIPLINE "MACHINE LEARNING AUTOMATION"

В данной статье проведен сравнительный анализ характеристик облачных платформ для решения технических потребностей в учебном процессе по дисциплине MLOps.This article provides a comparative analysis of the characteristics of cloud platforms for solving complex problems in the educational process in the discipline MLOps

EFFECT OF ALLOYING PROPERTIES OF Ti-40Nb SYSTEM ALLOYS

Исследованы процессы распада метастабильной β-фазы в закаленных сплавах системы Ti-40Nb при старении 400 и 500 °С, установлены временные интервалы выделения вторых фаз (α и ω). Проанализировано влияние легирования на изменение структуры, фазового состава и свойств после закалки и старения.The processes of decomposition of the metastable β-phase in hardened alloys of the Ti-40Nb system upon aging at 400 and 500 °C have been studied, and the time intervals for the precipitation of the second phases (α and ω) have been established. The influence of alloying on changes in structure, phase composition and properties after hardening and aging is analyzed.Работа выполнена в рамках соглашения с Министерством науки и высшего образования № 075-03-2023-006 от 16.01.2023 (номер темы FEUZ-2023-0015)

FORMATION OF INTERMEDIATE PHASES AND THEIR INFLUENCE ON THE MICROSTRUCTURE IN METASTABLE BETA ALLOYS

Изучен процесс распада метастабильного β-твердого раствора в областях температур βα превращения в закаленных сплавах Ti – 14Mo и VST3553 в интервале температур старения от 200 до 550 °С. С использованием рентгеноструктурного фазового анализа, дифференциально сканирующей калориметрии и просвечивающей электронной микроскопии установлено наличие метастабильных ω и Оʺ-фаз в сплавах, закаленных из β-области. Выявлено, что O'- и/или Оʺ-фазы непрерывно связаны с выделением ω-фазы и являются переходными до температуры образования α-фазы – 500 °С.The process of decomposition of a metastable β-solid solution in the temperature range βα transformation in hardened Ti – 14Mo and VST3553 alloys in the aging temperature range from 200 to 550 °C has been studied. Using X-ray diffraction phase analysis, differential scanning calorimetry and transmission electron microscopy, the presence of metastable ω and Oʺ-phases in alloys quenched from the β region was established. It was revealed that the O'- and/or Oʺ-phases are continuously associated with the release of the ω-phase and are transitional up to the formation temperature of the α-phase – 500 °C.Работа выполнена в рамках соглашения с Министерством науки и высшего образования № 075-03-2023-006 от 16.01.2023 (номер темы FEUZ-2023-0015)

RESIDUAL POROSITY IN TITANIUM IMLANTS MANUFACTURED BY MEANS OF ADDITIVE TECHNOLIGIES

На основе литературного обзора и собственных данных проанализированы виды пористости в титановых имплантатах, полученных аддитивными технологиями. В образцах, полученных SLS процессом выявлены поры, появившиеся за счет неполного слияния частиц. Материалы SLM технологий могут иметь такую же пористость, но в меньших проявлениях. В них чаще наблюдаются несплошности виде округлых пор. Третий вид пористости может быть обусловлен архитектурой 3D печати за счет программного обеспечения.Based on the literature review and own data, the porosity in titanium implants obtained by additive technologies is analyzed. In the samples obtained by the SLS process, pores appeared due to incomplete fusion of the particles. The materials of SLM technologies can have the same porosity, but in smaller manifestations. In them, discontinuities are more often seen as rounded pores. The third kind of porosity can be caused by the 3D printing architecture due to the software.Работа выполнена при финансовой поддержке постановления Правительства Российской Федерации от 9 апреля 2010 года № 218, номер соглашения 03.G25.31.0234 от 03.03.2017 г

EFFECT OF GD ON THE STRUCTURE OF NEAR-α TITANIUM ALLOY

The effects of gadolinium on the structure of the pseudo-α titanium alloy VT18U after standard heat treatments were studied by methods of metallographic analysis using an optical microscope, transmission and scanning electron microscopy. It was shown that intermetallic particles based on gadolinium and tin and particles of gadolinium oxide are present in the alloy after the treatments.Методами металлографического анализа с помощью оптического микроскопа, просвечивающей и растровой электронной микроскопии исследовано влияние гадолиния на структуру псевдо-α титанового сплава ВТ18У после стандартных термических обработок. Показано, что после обработок в сплаве присутствуют интерметаллидные частицы на основе гадолиния и олова и частицы оксида гадолиния

The study of influence of random variations of input rate to macro-scopic indicators of a non-stationary queuing system

Access control systems (ACS) are widely used to provide safe and comfortable passing for public events. The input rate of the flows of visitors passing through the ACS varies in the time. That is why ACS can be considered as non-stationary queuing system (NQS). The study of the features of the functioning of such systems is of great interest from a practical point of view. The obtained results could be used as a scientific justification for the design decisions that are accepted at the design and modernization stage of NQS. In addition, an objective assessment of the features of the functioning of these systems in moment of incident on an object for carrying out mass events (terrorist act, fire, etc.) need to be done. In simulation the input rate is similar to the function approximating the dependence λ = λ(t), fixed during the football matches. The results of simulation NQS, which receives on the input flow of requests with the rate λ = λ(t), changing in time are some of NQS characteristics. The dependence of the queue length, the waiting time in service queue and the number of visitors entered from time were calculated. The averaged dependencies of the NQS characteristics on time should be considered as functions. These functions have significant values that can be useful for engineers, designers and also appropriate security services: the number of entered visitors at the beginning of the event, the maximum length of the queue of visitors, the maximum waiting time in the queue and the corresponding time points. We propose to call them macroscopic characteristics of NQS. Taking into account that the dependencies recorded during the football matches contain both deterministic and random components, a priori, we can expect that the random part will influence the macroscopic characteristics listed above. The results of the conducted statistical modeling showed that in the studied range of variations in the input rate of requests, this component does not have a significant effect on the selected macroscopic indicators of NQS. © 2019 Tomsk State University. All rights reserved