The article considers the process of digitalization of the higher education system based on cognitive methodology. Based on the method of cognitive maps, the structural and functional aspects of the formation of a digital university in the context of the transition to a digital economy are visualized. The basic elements that determine the process of transition to a digital university (creation of a digital educational environment, formation of digital competencies, management based on a database, ensuring information security) are presented. It is determined that in the process of transition to a digital university, changes are systemic in nature, and affect management, educational, methodological and research practices, qualification requirements for all subjects of the educational process, changes in the body of technologies, methods, approaches and tools.

Keywords: cognitive model, cognitive map, digitalization, higher education system, digital university

Market relationships between energy producers and consumers leads to increased obligations for all market players. The problem of efficient distribution of electricity purchased on a wholesale market becomes relevant in the context of development of competition in the retail market. The prognostics of energy consumptions becomes a valuable criterion for planning the further consumers’ demands, reducing generation and transportation costs. In case of inaccurate forecasts, the company will be forced to buy or sell electrical energy at unfavorable price. The usage of multi-factor mathematical models in the prognostics makes it possible to make a highly accurate power consumption forecasting. The author proposes an interpretation of the complex energy consumption system as a multiple linear regression equation that takes the relationship between factors into consideration and allows to single out the influence of any factor on the power output.

Keywords: power consumption, train traction, power consumption forecasting, multiple regression, correlation coefficient, pair correlation, mathematical model, residual analysis, determination coefficient, Fisher's test

The article offers schemes and models that allow using formal parameters and procedures to expand the capabilities of cognitive modeling and increase the level of adequacy of decisions made based on the results of modeling. The paper presents various variants of modeling schemes, which allows the researcher to perform a more versatile analysis of the system, including the analysis of dynamic effects, as well as the selection of parameters of control actions that provide the desired level of system response.

Keywords: dynamic influence, control, simulation, formal cognitive model, formal neurocognitive network of f-euroconcept

The work is based on the results of a pilot survey conducted among students of Grozny State Technical University at the end of 2019. The questionnaire consisted of two parts. Designed to measure the affective and cognitive components of the attitudes under consideration. The study of the emotional attitude of students to friendship is reflected in the previous work. This article is devoted to the analysis of the cognitive perception of this social phenomenon. The results of a comparative analysis of these two components of the installations are also presented. A technique known as the test tradition in sociology was used to measure cognitive attitudes toward friendships. Students evaluated this parameter based on 11 primary characteristics. Further processing was carried out on the basis of the modernized method of analyzing hierarchies. In contrast to the generally accepted technology, the hierarchical structure of priorities was not set in advance. The priorities of the next level were determined by parallel factorization of the parameters of the underlying level. It is found that 11 primary parameters are reduced to three factors of the next level, which in turn form an integral indicator of the cognitive perception of friendship. The revealed hierarchical structure reflects various aspects of such cognitive perception. The paper presents the distribution functions of the obtained factors.

Keywords: friendship, cognitive component of attitudes, test technology, method of hierarchy analysis, factorization, integral indicator of cognitive perception, distribution functions by respondents

Using finite differences, a transition is made from a second-order differential equation to a difference equation to describe the dynamics of the integral indicator of product quality. Relationships between the coefficients of the difference equation of quality dynamics and the second-order autoregression equation for the integral quality indicator are determined. On the basis of experimental data on the dynamics of the integral quality indicator, the adequacy of its description by a second-order linear differential equation, as well as the related linear difference equation and the autoregression equation, is substantiated. The analysis of the results of the activities of three Russian enterprises to ensure the quality of the trolleybuses they produce using a generalized analogue of the sensitivity coefficient, the ratio of the average value of the control action to its range and the pulsation coefficient. The relationship between the results of the activities of these enterprises and their further life cycle is considered.

Keywords: quality dynamics, finite difference method, autoregression, integral quality indicator

Currently, there is a rapid development of computing systems, including systems that include various types of devices. Such systems are called heterogeneous or heterogeneous. In addition to traditional processors, such a system may include graphics processing units, programmable gate arrays, and other devices. One of the most pronounced problems of such systems is the complexity of distributing the computational load between the nodes of the computing system. This paper describes the types of balancing and methods for distributing computational load in heterogeneous computing systems. An example of load balancing in a real heterogeneous computing system is described.

Keywords: heterogeneous system, heterogeneous system, load balancing, load distribution, computing cluster

The paper considers the characteristics of cloud convection obtained in the course of computational experiments on the basis of a three-dimensional physical and mathematical model of convective clouds, which takes into account in detail the microphysical processes of nucleation, condensation or sublimation of water vapor, coagulation and accretion of precipitation particles, accumulation of volume electric charges, and an increase in the electric field strength. clouds due to charge separation processes occurring during the rapid freezing of large supercooled drops, accretionary growth of cereals and hailstones. Based on the data of numerical modeling using the noted model, the location in the volume of the microstructural parameters of thunderstorm clouds (water content and ice content), space charges, electric field strength, radar reflectivity in the centimeter range, and other parameters at fixed times of cloud evolution was investigated.

Keywords: convective cloud, cloud microstructure, cloud electricity, numerical three-dimensional model, radar reflectance, electrical coagulation

The problem of experimental determination of the parameters of the error model of MEMS accelerometers is considered. Possible sources of errors and their nature are shown. When developing a model of errors, the influence of non-orthogonality of the axes, temperature dependences of the conversion coefficient, and displacement of zeros were taken into account. A mathematical model of the MEMS accelerometer errors and an algorithm for the experimental determination of its parameters have been developed. Specific structural schemes of the stands are presented. Their hardware and software implementation is described. Specific features of temperature control in a small-sized heat chamber with a heater and a cooler based on a Peltier element are considered. An example of experimental estimation of the parameters of the error model for one axis of the MPU6050 accelerometer is shown. The developed tools make it possible to start a systematic study and objective comparison of the characteristics of MEMS accelerometers from different companies, as well as to obtain their working error models suitable for use in filtering algorithms in the construction of various systems of inertial navigation and angular stabilization of objects.

Keywords: microelectromechanical systems, MEMS, errors, models, methods, designs, accelerometer, microcircuit, modeling

Recognition of radiation from celestial bodies by technical means is an important task in the orientation of spacecraft. For a device that is part of the Earth orientation device, a variant of modeling an electronic signal amplifier received from a pyroelectric sensor is studied. On the recommendation of the developers, the properties of trans-impedance operational amplifiers were studied, and suitable coefficients for the negative feedback circuit were selected. The type of output signal of the model is studied in comparison with the recording of values taken from a real photodetector. The preferred design of the model in the Matlab Simulink environment is shown – a model defined by an electrical circuit using the Simscape Electrical library.

Keywords: simulation of electric circuits, space orientation, photodetecting device, transimpedance amplifier, optoelectronic devices, space instrumentation

Modern software development approaches requires perfect stable infrastructure and processes linked with that. Infrastructure has to be highly available, reliable and provide fast and comfortable tools for deployment, support, upgrade product. This article describes software development approach which is allow to use modern tools and methodologies to improve product quality, speed up its delivery and significantly increase stability. As a result it was considered to use GitLab, Jenkins, Git and Kubernetes technologies as basis of infrastructure and DevOps, CI/CD and IaaC as methodologies and how to introduce it in the company.

Keywords: GitLab, Jenkins, Kubernetes, Git, DevOps, CI, CD, IaaC, infrastructure, methodologies, software, development

We consider the problem of planning reasonable guaranteed fuel reserves of various types to ensure maintenance of a group of dispersed objects by field service authorities. Factors affecting the effectiveness of the solution are considered. It is proposed to apply a "competition" of two decision methods: on the basis of statistical data on the weather for the period under review and on the basis of the game theory method, which considers nature as a malicious opponent. A method for analyzing the results is proposed.

Keywords: game theory, simplex method, statistical processing of results, objective function

The article reveals the results of the work carried out on modeling the dynamic model of the electric drive of the scanning mechanism of the Earth orientation device, which is based on a hybrid stepping motor. The simulation is based on NEMA 17HS3410 motor parameters. A brief description and features of hybrid stepper motors are provided. The simplest model of an electric drive is considered, in which there is a rigidly set moment of force, a moment of inertia of the rotor of an electric motor, and also the moments of dry friction and the moment of liquid friction are taken into account. It is shown how the change in the value of fluid friction affects the general behavior of the mathematical model of a hybrid electric motor. The behavior of a single-pole stepper drive is simulated. The relationship of the value of the moment of force acting on the rotor with the passport characteristics of the investigated electric motor is considered. The possibility of controlling the scanning mechanism based on P- and PI-controllers is estimated.

Keywords: electrodive, Simulink, moment of force, inetria moment, liquid fricton

The paper presents an integrated approach using machine learning methods for choosing a trading strategy on the currency exchange. The presented approach uses the calculation of the linear regression angle coefficient by log return indicators and determination of the BTC/USD currency pair quotes trend in the next period based on the calculated coefficient sign. The feedforward multilayer neural network is used to predict the angle coefficient value in the next ten minute period for the current twenty minute period. The paper proposes a combined approach to the use of machine learning methods for choosing a trading strategy in foreign exchange. The study presents the results of experiments evaluating the practical results of effective and ineffective strategies based on the predicted values ​​of linear regression coefficients.

Keywords: diversification of management, production diversification, financial and economic purposes of a diversification, technological purposes of ensuring flexibility of production

The principles of constructing a mathematical model of water purification based on the use of a biologically active layer, the bacteria of which absorb harmful impurities contained in the water, are considered. A system of equations is given, on the basis of which a water treatment model is constructed in the simplest element, which is a rod covered with a biofilm. The system of equations is a system that includes a parabolic equation in a three-dimensional domain and a hyperbolic equation on a part of the surface of the domain, connected to each other through the boundary condition and the potential in an equation of hyperbolic type. Next, an asymptotic analysis of this system is carried out, which makes it possible to reduce the model of an individual element to the solution of a simple ordinary differential equation. On this basis, a model is proposed for the operation of the entire water treatment device containing a large number of such elements.

Keywords: water treatment, biologically active layer, asymptotic analysis of solutions in a thin area, biofilm, mathematical model of pollution treatment, system of differential equations of mixed type, optimization of biofilter designs, urban wastewater

The negative trends in the country's economy associated with the COVID-19 pandemic have also affected the construction industry of the Russian Federation. The impossibility of transferring construction to a remote mode, the suspension of the work of construction companies affected their financial activities. In addition to government support, construction companies must independently seek ways to improve their performance. One of the ways to improve the quality of management in the implementation of investment and construction projects is to use the approach of integrated project implementation. Within the framework of this approach, it is necessary to focus on quality management at all stages of the life cycle. It is proposed to use this approach in conjunction with the methods of business information modeling technology for projects.

Keywords: Integrated Project Delivery, lean construction, business information modeling

The present paper presents studies of friction and wear characteristics occurring in the frictional contact zone when various frictional substances are forcibly introduced into the active contact zone by the method of molecular dynamics.

Keywords: friction activation, special material, method, quantum-chemical analysis, molecular dynamics, tribology, friction, computer simulation

Text summarization is the process of creating concise summary of a text document which maintains important meaningful information and general meaning of source text. In this paper we overview automatic text summarization task and text preprocessing methods, then we describe the main approaches to automatic text summarization and finally six methods are compared by their performances and execution times. Results of comparison are presented along with example of text summarization. This overview can help those looking to get a basic understanding of the text summarization task and NLP field.

Keywords: text summarization, machine learning, natural language processing

This article considers the option of using a simulation model in organizational conflict management as an intelligent analyzer of a conflict situation. It is proposed to build its own style of leadership, necessary and sufficient to successfully overcome the organizational conflict. Based on the model forecast, the manager constructs an appropriate solution within the framework of the variability of authoritarian, democratic and liberal styles of government with the help of the auxiliary variables available to him. This allows him not only to get out of the usual style of leadership, but also to choose the necessary and sufficient style in this case, to test style behavior strategies. The manager has the opportunity to use the management style that best suits the internal and external conditions of his activities. Today, managers must meet the emerging problems and the ability to solve them effectively with their stylistic variability.

Keywords: simulation model, conflict in the organization, management style, behavior strategy, manager

The work is based on experimental results obtained by a survey among students of Grozny and Rostov-on-Don. The affective component of students ' attitudes towards friendship was determined by the technology of semantic differential Ch. Osgood. The distribution functions of the respondents ' emotional attitude to virtual and real friendship, calculated in the framework of a previously developed nonlinear stochastic model, are presented. The results of the comparative analysis show that in the group as a whole, the difference in the perception of real friendship between the respondents of both cities is small. On average, Grozny residents are a little more positive about real friendship. Students of both studied samples perceive virtual friendship in general more negatively than real friendship. But here the difference in relations is more significant. Subgroups with a positive perception in Grozny are about 10% less. On average, Grozny residents are more negative about virtual friendship than Rostov residents. Most likely, this is due to a difference in mentality.

Keywords: friendship, virtual friendship, affective component of attitudes, semantic differential technology, nonlinear phenomenological model, comparative analysis

When determining the locations of compensating devices, it is necessary to make complex calculations that take into account various factors (included in the equations in the form of variables). To get results, calculations are performed repeatedly. Newton's method with coefficients in the form of a Jacobi matrix is widely used. An algorithm for solving the necessary equations by the Gauss method is considered, and the required number of iterations is determined to obtain reliable results.

Keywords: compensating devices, electric power, network state, nodal conductivity matrix, Gauss method, algorithm, Newton's method, electrical nodes, iterations, convergence, algorithm

One of the effective ways to increase the information secrecy of a constellation of low-orbit spacecraft (LVS) is the use of a satellite authentication system (SAS). In order to reduce the time spent on determining the status of the satellite, as well as to increase the fault tolerance of the identification system, in a number of works it is proposed to use the codes of the polynomial system of residue classes (PSCS). This paper presents a methodology for constructing a fault-tolerant authentication system for a spacecraft, which is based on exchange operations implemented in PSKV codes. Using exchange operations, that is, changing the number of informational and redundant bases, it is possible to ensure the possibility of maintaining the operational state of the identification system in the event of a sequence of failures, as a result of which the level of information secrecy of the NSA will not be reduced.

Keywords: satellite authentication system, polynomial system of residue classes, exchange operations, method of building a fault-tolerant identification system

The article provides an overview of some methods of personal identification based on his biometric data, as well as the basic principles of the implementation of these methods. A method for the reliable storage of biometric data on remote spatially distributed storages using algorithms based on the residual class system is also proposed.

Keywords: personal identification methods, biometric human identifiers, residual class system, data separation schemes

This article is devoted to information modeling of real estate objects. The most suitable option for three-dimensional data representation for managing information about buildings and structures, in time and space, is BIM technologies. When they are used in construction, a detailed model of the capital construction object is created, therefore, such information can become the basis for creating and filling in a 3D cadastre.

Keywords: BIM technologies, information model, 3D format, information modeling, Unified state register of real Estate, general data environment

The idea of using a stability control system, developed for small robots, on active (robotic) exoskeletons to recover patients with impaired walking function. A method for controlling gait stability based on the zero-moment point is proposed. It takes into account the inclination angle of the sports surface, which is achieved by controlling the ankle joint of the exoskeleton. The results show that the proposed control method ensures the stability of the human-exoskeleton system when walking on a swinging surface in the presence of momentary disturbances.

Keywords: medical exoskeleton, huamnoid robot, stability control

Soft Defined Radio (SDR) or a software-configurable receiver is the most promising direction for the development of modern radio receivers. Therefore, the study of the principles of its construction should be given special attention in the training of radio engineers. However, since most of the operations for processing and converting the received signal are carried out in software, including in signal processors, the construction of a laboratory layout that is easy to understand raises questions. In this paper, for the greatest coverage of all the processes of processing and converting the received signal, it is proposed that the laboratory model be implemented on the basis of the superheterodyne receiver model with double frequency conversion with a nonzero intermediate frequency. The result is the ability to study the impact of software settings and the adjustment of the parameters of individual structural elements of the circuit (model), as well as the types of individual elements.

Keywords: Soft Defined Radio, band-pass filter, SDR receiver, two-position coding, time constant, amplitude-to-digital converter, BPSK, bandwidth