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  • Graphoanalytic model of the process of eliminating the consequences of computer attacks and responding to computer incidents

    The most important task of the theory and practice of information security is to analyze the process of functioning of the subsystem for responding to computer incidents and eliminating the consequences of computer attacks of the information protection system of automated special-purpose systems under the influence of computer attacks by an attacker on the protected information resource, service or network, which involves modeling the response process. A generalized model of the process of eliminating the consequences of computer attacks and responding to computer incidents is presented in the form of a directed graph, where the vertices correspond to the states of the subsystem, and the arcs correspond to transitions from state to state. The description of the subsystem functioning in the state space allows you to simulate the process of responding to computer incidents and eliminating the consequences of computer attacks, evaluating generalized indicators of the time spent by the subsystem in various states and promptly manage the response process by changing the controlled parameters of the model. The model takes into account many types of computer attacks and many strategies for managing information security tools in the process of eliminating the consequences of computer attacks, is the theoretical basis for the development of a methodological apparatus for analyzing, evaluating and prioritizing the processing of computer incidents, as well as the study of issues of dynamic management of the subsystem of responding to computer incidents in order to increase the efficiency of its functioning. The use of the proposed model makes it possible to apply both empirical values of the implementation time of the response and counteraction subprocesses obtained as a result of measurements or modeling, and the theoretical basis for modeling the counteraction of information security tools to computer attacks of various types.

    Keywords: automated special purpose system, simulation, information security system, information security tools, computer incident, computer attack, system status

  • Building control using point cloud and building information model

    The article discusses the methodology for conducting building control using an information model of building structures and a cloud of points obtained using ground-based laser scanning technology. The proposed technique makes it possible to increase the efficiency of identifying geometric deviations in the course of monitoring the construction of industrial, civil and infrastructure facilities.

    Keywords: digital technologies, BIM model, information model, point cloud, terrestrial laser scanning, construction control

  • Comparison of the operation of arch-cable-stayed combined systems of two types with simple arches

    The construction of public buildings from a metal frame is always associated with the search for a rational constructive solution that meets not only the dependability requirements, safety, but also architectural and design solutions. Often, the solution to the problem of rationalization of roof construction in public buildings is the use of arched combined systems, since such systems have a number of advantages over simple arches: the survivability of combined systems is higher than simple ones, the possibility of creating complex, architecturally expressive spatial structures, lower material consumption, high load-carrying ability with relatively low weight, etc. The aim of the research is to find a rational construction solution for two arch-cable systems (Hud type system and Radial type system) by comparing in terms of the minimum internal forces, displacements and metal intensity at different ratios of the arch boom and span. Based on the calculation results in the Lira SAPR 2020 software, the most unfavorable loads combinations were determined, deformation schemes of arch systems, displacements, moments and forces were obtained, sections of arches and ties were selected. From ten arched structures of two types considered with different ratios of arch boom to span, the Hub type system with the ratio of arch boom to span f/L = 1/3 and Radial type system with the ratio of boom to span f/L = 1/4 showed the best result in terms of efficient operation and metal intensity.

    Keywords: combined systems, arch-cable constructions, simulation of prestress, hub type s

  • Modeling a bandpass filter based on the Sallen-Key topology

    This article discusses the modeling of a 4th order Butterworth bandpass filter, with the Sallen-Key topology, composed of 2 stages with a bandwidth from 31.5 Hz to 8.5 kHz, designed to work as part of a digital noise level meter . Modeling was carried out in a modern computer-aided design package Filter Design Tool from Texas Instruments. The simulation results are presented, a conclusion is made about the correspondence of the parameters of the simulated filter to the calculated ones. The filter has a satisfactory quality factor, amplitude deviation in the passband, is quite simple and economically acceptable from the point of view of its implementation.

    Keywords: noise meter, bandpass filter, Butterworth filter, Sallen-Key topology, modeling, CAD

  • Mathematical modeling of the bottom-hole zone of the trunk with a combined sinking scheme

    The support in the bottom-hole zone of the trunk is a system of rings made of monolithic concrete having a different hardening period, which increases from the face up the trunk and is determined by the duration of the tunneling cycle. The strength and deformation parameters of the concrete support depend on the age of the concrete. Thus, to determine the strength of concrete in the early stages of concrete hardening, various empirical dependencies are used that link the strength of concrete at the design age with the strength at the required age. Based on a series of calculations performed by the finite element method, it was found that the change in the penetration rate does not significantly affect the relationship between stresses and deformations when static equilibrium is reached in the ""support – array"" system, which occurs at a high penetration rate at a greater distance from the bottom of the trunk. At the same time, intensive loading of the support at an early age can disrupt the process of natural hardening of concrete, lead to a violation of its structure, the development of fracturing, which will entail a decrease in the bearing capacity and water resistance of the support, a decrease in its durability.

    Keywords: shaft, sinking, support, concrete, stress, deformation, strength, bearing capacity

  • Development of a measuring unit for an intelligent territory protection system

    The author carried out the development of the measuring unit of the intellectual system for the protection of the territory. Based on the review of devices of a similar purpose, a block diagram of the device was developed. A functional diagram of the developed device based on the block diagram has been developed and described. The description of the computer experiment on modeling the operation of the input block of the circuit in Micro-Cap, its results and analysis is given.

    Keywords: measuring unit, intelligent system, modeling, vibration, triboelectric sensor

  • Automated information and measurement system of commercial electricity metering using Web-technologies

    The article presents the results of a study of an automated system of commercial accounting of energy resources. The open architecture of the top-level software of the automated information and measurement system of commercial electricity metering, based on WEB technologies, has been developed and tested, which will allow further research and scientific activities in the field of mathematical and software processing of data on electricity consumption. A module of planning and management of enterprise resources has been developed for the implementation of AIIS KUE in the MCD based on the developed diagram of use cases.

    Keywords: WEB technology, automated information and measurement system, electricity, energy consumption, automatic control

  • Module of electrical impedance tomography of the artificial lung ventilation apparatus

    The article describes the development of an electrical impedance tomography module with the following characteristics: number of electrodes n = 16; injected current I = 5 mA ± 2%; permissible error of the measuring channel δadm = 2%; injected current frequency f = (10…400) kHz; resulting voltage on the injection electrodes U ≤ 12 V; the shape of the injected current is sinusoidal, triangular, rectangular; USB data interface. A functional diagram of the device has been developed and described. Simulation of a current source with a connected load in the MicroCap software package was carried out

    Keywords: electrical impedance tomography, ventilator, disease diagnostics, modeling

  • Development of a Device for Measuring the Instantaneous Velocity of Plasma in an Electrodynamic Accelerator

    in the course of designing a device for measuring the instantaneous velocity of plasma in an electrodynamic accelerator, a block diagram of the implementation of the developed method was developed. A mathematical description of the calculation of the instantaneous velocity of plasma in an electrodynamic accelerator is presented. The choice of a realizable method for measuring the instantaneous velocity of plasma in an electrodynamic accelerator using a differential-total-ratiometric coordinate function and approximating the position sensor signal by an inverse-exponential function is substantiated. Simulation of the computing unit of the device in the Micro-Cap environment has been completed.

    Keywords: measuring device, electrodynamic accelerator, plasma velocity, differential sensors

  • Analysis of the effectiveness of methods for solving systems of linear algebraic equations in calculating the integral characteristics of the functioning of distributed information processing systems

    The paper presents the results of numerical experiments on solving systems of linear algebraic equations (SLAE) with discharged matrices by the LU decomposition method, the Jacobi method, the Gauss-Seidel method, the modified Gauss-Seidel method and the modified Jacobi method with a relaxation parameter ω. In the course of numerical experiments on the solution of (SLAE) with test discharged matrices of various dimensions using the MATLAB package, it was found that the best results in the time of solving the problem were obtained by the modified Gauss-Seidel method with a relaxation parameter ω = 0.5 or a given accuracy of solutions ε= 10^-6. In the future, this method was used to calculate the integral characteristics of the functioning of distributed information processing systems for various practical applications.average system response time to user requests).

    Keywords: distributed information processing system, a system of linear algebraic, equations, sparse matrix, LU decomposition, Jacobi method, Gauss-Seidel method, relaxation parameter

  • The concept of Virtual Dom in the React.js library

    The concept of the Virtual DOM technology in the library for creating web user interfaces React.js is considered. A comparative analysis of approaches to the construction of modern user interfaces is carried out. The technological implementation of the internal mechanisms and algorithms of the Virtual DOM concept in React.js is considered. Describes current trends in the development of web applications.

    Keywords: data processing, data visualization, web applications, user interfaces, algorithms, software development, data updating, client-server applications, web development trends

  • Modeling the application of a geotechnical screen to minimize the impact of new construction on a subway station

    The relevance of this study lies in the fact that the mutual influence of existing transport facilities and the newly erected underground part will be taken into account and the ways to minimize the geomechanical impact on each other will be determined. The subject of the study is the stress-strain state of the system ""structure - massif - structure"". The purpose of the study is to minimize the mutual influence of the subway, the railroad and the underground part of the designed building.

    Keywords: geotechnical screen, mathematical modeling, FEM, underground structure, mutual influence, stress-strain state, subway station, minimization of influence

  • On some problems of synthesis of optimal control with matrix and vector components in the Riccati system

    The problem of optimal control synthesis is formulated and the matrix and vector components in the Riccati system are taken into account. Bellman's dynamic programming method was used to determine the patterns. A specific mathematical model of the oscillatory process is considered and its properties are numerically investigated. Examples of linear and quasi-linear problems are given and the minimum possible value of the quality criterion is determined. The corresponding graphical dependencies are constructed and with the help of optimal control tools, the state of the object is transferred from one point to another. Based on the use of the Zubov power series method, optimal control is revealed. Numerical calculations are carried out and Riccati functions are obtained in a nonlinear system with concentrated parameters.

    Keywords: synthesis tasks, optimal control, matrix and vector components, Ricatti system, oscillatory process, quality criteria

  • Numerical Study of the Heat Transfer Process in a Flat Wall with Internal Heat Sources under Boundary Conditions of the First Kind

    In this paper, we study the process of heat conduction in a flat wall with an internal heat source under boundary conditions of the first kind. Various numerical and analytical methods are used to solve heat transfer problems. Each method has a number of advantages and disadvantages. The paper proposes to use the numerical method of finite differences. The original differential equation, as well as the boundary conditions, are approximated using a finite difference scheme. The essence of the method is to apply a spatiotemporal grid to the computational domain. For each grid node, a difference relation is written (the original differential equation with boundary conditions is replaced by the corresponding expressions obtained using the difference scheme). Solving this scheme, we obtain the temperature values ​​in the plate for each step in time and coordinate. On the basis of the solution obtained, graphical dependences of temperature on time and coordinates are constructed, and their analysis is carried out.

    Keywords: finite difference method, thermal conductivity, plate, internal heat source, boundary conditions of the first kind

  • Mathematical modeling of the thermal regime of premises

    A review of methods for calculating microclimate parameters is performed. The possibility of using existing mathematical models to describe the aerodynamic characteristics of ventilation valves and optimize their performance indicators: productivity, hydraulic resistance, density, response time and other parameters that form their efficiency is considered. In order to assess the correspondence of the obtained mathematical dependencies, a physical experiment was conducted. The adequacy of the mathematical model was verified by comparing the results of calculating the parameters of the internal environment in the SolidWorks software and computing complex with experimental data.

    Keywords: microclimate parameters, heat and mass transfer, mathematical modeling, heat transfer resistance, experimental study of microclimate, air mobility, valve

  • Control and measuring system for dynamic measurement of cargo dimensions

    The system for measuring cargo dimensions is designed for streaming measurement of cargo dimensions, which can be luggage at airports and transshipment bases, various parcels, as well as commercial cargo. The authors of the article developed a structural and functional diagram of a control and measuring system for dynamic measurement of cargo dimensions, and also considered the principles of its operation.

    Keywords: control and measuring system, measurements, cargo dimensions, luggage, automated systems

  • On the influence of ambient temperature on the initial elevation of flare emissions

    The article deals with the issue of the influence of ambient temperature on the initial height of the flare emissions rise. The paper presents full-scale and theoretical studies of flare emissions operating near a temporary residential complex. In the course of the work, a series of images of flare emissions at different ambient temperature conditions was carried out and their subsequent comparison with the theoretical model was carried out. Field studies verify the theoretical model and establish that the initial height of the flare emissions depends on the ambient temperature and has an inverse proportionality.

    Keywords: Flare, flare emissions, atmospheric air pollution, PM2.5

  • Simulation of voltage stabilizer tester

    In this paper, a study was made of the test device for voltage stabilizers Teplocom ST-222/500, ST-555, ST-888. The DUT provides the verification algorithm outlined in the setup, verification, and process run instructions. This test involves changing the phasing of the conductors at the input of the device under test; control of voltage sources supplied to the tested stabilizer; measurement of voltage values ​​at the input and output of the stabilizer; their registration. The aim of the work is to design a device for testing voltage stabilizers, with an error of the measuring unit of not more than 2.5% and a test speed of at least 1.3 s. To confirm the achievement of the specified parameters, simulation was carried out in the MicroCap 11 software package.

    Keywords: voltage stabilizer, MicroCap, Teplocom, transient simulation

  • Modeling of hexagonal - shaped membrane vibrations

    This work presents a simulation of a hexagonal membrane. Some partial solutions for the problem of free vibrations of a membrane of regular hexagonal shape with a different initial bending of the surface are obtained and the natural frequencies of vibrations are found. The result obtained can be used in modeling wing structures in the form of a hexagon of such aircraft as a paraglider.

    Keywords: Modeling of a hexagonal wing, free vibrations of a membrane, a membrane of a regular hexagonal shape, natural frequencies of vibrations

  • Parametric synthesis of the controller of the stepper motor control system of the road printer

    The article presents the results of a study of the stepper motor control system of a road printer. The use of a stepper motor imposes additional requirements on the road printer in terms of operating parameters control. The main requirement for the stepper motor of the road printer is to ensure the rotation of the rotor, at a given angle, which depends on the control mode. The description of the road printer is given. The dependencies of the stepper motor as a control object are given. Investigated for the stability of the Nyquist system. A simulation model of the stepper motor control system of a road printer has been developed and simulation results are presented.

    Keywords: road printer, stepper motor, mathematical model, transfer function, modeling, controller

  • Features of heat and mass transfer processes in the spray chamber

    This article discusses the features of the processes of heat and mass transfer, taking into account the formation of the contact surface during the interaction of air and water droplets sprayed in the working space of the spray chamber. The results of numerical modeling of heat and mass transfer processes are presented, which made it possible to establish the conditions of liquid atomization that ensure the most efficient flow of heat and moisture exchange processes in the working space of the spray chamber.

    Keywords: air handling unit, spray chamber, heat and mass transfer, diffusion model, efficiency, droop parameters, calculation model, numerical simulation

  • Study of the structural model of a solid body with an elementary volume in the form of a polyhedron using finite element analysis in the LIRA-SAPR 2017 software package

    The paper considers a structural model of a solid body. Yu. N. Malashkin proposed a structural model of concrete, the main idea of ​​which is an elementary volume in the form of a polyhedron formed from rod octahedra. When developing the model, only its analytical analysis was carried out. In this work, in the development of the model, its finite element analysis was carried out in the LIRA-SAPR software package. The study showed the coincidence of the qualitative and quantitative parameters of the model obtained by numerical and analytical calculations, confirmed its adequacy in relation to concrete.

    Keywords: structural model, concrete, elementary volume, polyhedron, rod octahedron, finite element analysis, lira-sapr software package

  • Modeling of the zeta potential in the primembrane layer

    The article presents an overview of the work on modeling the behavior of a double electric layer in membranes under influences of various nature, including the example of various surface phenomena (adsorption, surfactants, adhesion, wedging pressure, electroosmosis, etc.). It was noted that the size and distribution of the charge over the surface near which it is formed has an effect on the structure of the DES; to obtain the potential distribution, it is necessary to know the structure of the membrane-electrolyte solution interface; it is intermediate to be able to calculate the charge distribution, and, accordingly, to calculate the potential distribution itself. It was pointed out that when choosing a mathematical interpretation of the process, the Poisson equation is often used, taking into account the self-consistent field, or the Navier-Stokes equations are solved together with the Nernst-Planck equation and the electroneutrality condition; the Gui-Chapman model is used to describe processes with low accuracy by molecular dynamics methods, supplemented by the ion adsorption condition according to the Langmuir isotherm; when modeling the electrolyte current, the description of the surface current of ions is used, taking into account the viscous properties of the medium.

    Keywords: double electric layer, zeta potential, membrane, primembrane layer, spatial charge density, Navier-Stokes equation, surface current, Poisson equation, capacitor, fluid flow potential

  • GIS-design and analysis of long-term regional variability of forest fires

    The article discusses the possibilities of GIS technologies for assessing the spatial and temporal distribution of forest fires in the European part of Russia. An analysis of the variability of data on both forest fires and climate data for the same long-term period and on the same regional scale was performed. General trends and main fire hazards have been identified that will help in the future, in the presence of reliable climate scenarios, to make decisions on prevention strategies and more effective fire management.

    Keywords: forest fires, geoinformation systems, analysis, climate, spatial distribution, effective management

  • Information-measuring system of input control and quality analysis of components

    To ensure the correct and continuous operation of all electronic devices, it is necessary that all components of these devices correspond to their declared characteristics. In this article, an information-measuring system for incoming control and analysis of the quality of components is being developed. Structural and functional diagrams of the system were developed. A natural experiment was carried out.

    Keywords: information-measuring system, input control, quality analysis, components