Modeling placement of service-oriented cloud applications in a softwaredefined infrastructure of virtual data center

The paper describes efficient algorithm for optimization technology of containerization cloud applications and services in the virtual data center (VDC) infrastructure. We propose an efficient algorithm for placing applications in the infrastructure of a VDC The problem of optimization of placing services oriented cloud applications based on the template VM and containers with disabilities infrastructure of VDC is reduced to the problem of packing in containers. We also generalize the well renowned heuristic and deterministic algorithms of KarmakarKarp.The research has been supported by the Russian Foundation of Basic Research (grants 16-37-60086 mol_a_dk, 16-07-01004 a), and the President of the Russian Federation within the grant for state support of young Russian scientists (MK-1624.2017.9)

Thermoelectric performance of weakly coupled granular materials

We study thermoelectric properties of inhomogeneous nanogranular materials for weak tunneling conductance between the grains, g_t < 1. We calculate the thermopower and figure of merit taking into account the shift of the chemical potential and the asymmetry of the density of states in the vicinity of the Fermi surface. We show that the weak coupling between the grains leads to a high thermopower and low thermal conductivity resulting in relatively high values of the figure of merit on the order of one. We estimate the temperature at which the figure of merit has its maximum value for two- and three-dimensional samples. Our results are applicable for many emerging materials, including artificially self-assembled nanoparticle arrays.Comment: 4 pages, 3 figure

Thermoelectric performance of granular semiconductors

We study thermoelectric properties of granular semiconductors with weak tunneling conductance between the grains, g_t < 1. We calculate the thermopower and figure of merit taking into account the shift of the chemical potential and the asymmetry of the density of states in the vicinity of the Fermi surface due to n- or p-type doping in the Efros-Shklovskii regime for temperatures less than the charging energy. We show that for weakly coupled semiconducting grains the figure of merit is optimized for grain sizes of order 5nm for typical materials and its values can be larger than one. We also study the case of compensated granular semiconductors and show that in this case the thermopower can be still finite, although two to three orders of magnitude smaller than in the uncompensated regime.Comment: 4 pages, 4 figure

What Competences Does the Regional Market of IT Specialists Want? Development and Approbation of Technology for Analysis of Current Vacancies in the Labor Market

One of the most dynamically developing industries in Russia is IT industry. The main problem of IT development is the lack of highly qualified specialists. Determining the relevant and in-demand knowledge and skills of specialists is possible on the basis of an analysis of vacancies posted on Internet job search portals. The study is aimed at development and approbation of the technology for analysis of current vacancies for IT specialists for further designing the content of additional vocational educational programs. Modern machine learning techniques such as Natural Language Processing can be used for automatic position selection based on skills in vacancies. K-means method was used in this paper for cluster analysis of hard and soft skills lists from vacancies posted on the HeadHunter website. The most popular skills have been determined such as teamwork skills, knowledge of working with databases and version control systems, as well as proficiency in English. It has been established that in 2021 the most popular programming language is JavaScript. As a result, two variants of programmer specialization were formed, hard and soft skills for each specialization were determined

Analysis and Forecasting Students’ Academic Performance Using a Digital Educational Environment

Analysis and Forecasting Students’ Academic Performance Using a Digital Educational Environment The article discusses technical solutions used at Orenburg State University to organize a digital educational environment. Also, the authors have studied the academic performance of technical and humanities students during the period of face-to-face education and during the lockdown period. The analysis of academic performance shows the absence of significant deviations in one direction or another. The key internal and external factors that influence the students’ academic performance are highlighted. It can be concluded that the use of both internal and external factors gives a high accuracy in predicting the final progress of students

Psychological features of hockey players with different stress resistance

Objective: to study emotional and characterological features of hockey players with different stress resistance. Materials and methods: 120 hockey players of the Junior Hockey League (JHL) aged from 16 to 21 years were involved in the study. Interviewing, evaluation of medical records, test of differential self-assessment of the functional state (SAN) and method of personality research using the questionnaire FPI (modified form B) were conducted. Results: according to the results of the study, it was found that hockey players with high stress resistance had significantly lower rates on the scales of neuroticism, depression, irritability, emotional lability, as well as significantly higher rates on the scales of sociability, openness, well-being and mood (p&lt;0.05). On the contrary, hockey players with low stress resistance had opposite features. Also, hockey players with high stress resistance had a higher sports experience, as well as better health. Conclusions: stress-resistance of players has significantly high connection with neurotism and irritability, as well as significant moderate negative association with age and sports experience. It is established that with increasing of neuroticism and irritability, as well as reducing of the age and sports experience stress resistance of hockey players decreases. Taking into account the results of the study, in order to maintain health, prolong professional longevity and maintain the proper level of performance of hockey players, it is important to use an integrated approach that provides a whole group of activities: rationalization of work and rest, improvement of working conditions, optimization of microclimate in the team