This article discusses the problems of optimal placement of information resources on the nodes of a computer network. The main methods used in solving this problem are presented. In particular, the method of random allocation of resources, optimization of allocation of resources using the branch and bound method, and optimization of allocation of resources using a genetic algorithm are considered. For these methods, the structure of the input and output data has been determined, in addition, the internal structure of resource allocation has been demonstrated for the presented methods. A key aspect of the consideration in this article is the formulation of the problem and the modeling of its solution using the algorithms presented. As a result, testing of the developed module on the input data and analysis of the prospects for using the module are presented.

Keywords: computer network, information resource, random allocation of resources, simplex method, branch and bound method, genetic algorithm, design, modeling

The article presents a detailed analysis of the structure of the model of management of the hematopoietic functional system of the body in various physiological situations, which activates the activity of a certain adaptive circuit that characterizes the functional state. The first state and adaptation to the contour of the functional hematopoietic system of the body included in the work are considered in detail. The structural equation of adaptation of the first contour is made. It is concluded that the equation of adaptation compiled for a hypothetical control model adaptation, in the actual state of Affairs raises a number of inconsistencies with the hypothetical implementation-related deviations from the ideal parameters of functioning: autonomic nervous system, internal environment, metabolic state, the processes of transmitting the control actions. All these deviations affect the observed realization of the set of blood form elements (RSBE).

Keywords: physiological model of functional hematopoietic system, the adaptive circuit, the space of external influences, categorical diagram, adaptation processes, gemondo-nuclear level, functino mapping, homomorphic mapping, the equation of adaptation

The important function of the automatic process control system is the ability to forecast and control the quality of a product. The implementation of these functions can be done by using formal models that allow to do the quick reconfiguration of the technological process when the composition of the raw materials and the requirements of product characteristics are changed, etc. in relation to the prediction and management of quality indicators of road and construction bitumens, methods of getting formal models that relates bitumen quality indicators with technological parameters of their production both for classical regression equations and for formal neural networks. The method of getting such models has been worked out on abstract dependencies with further adaptation of the production of bitumen. According to the received formal models the automated process control system can solve both the direct problem of predicting quality indicators by substituting the input technological parameters for the model input, and the inverse problem using nonlinear programming methods to minimize the deviation functions of the quality parameters obtained from the model from the target values given operator technologist.

Keywords: Bitumen, quality indicators, quality forecast, management of the quality, formal models

A program has been developed that allows to evaluate the adhesion of paint coatings by means of analyzing images of the surface of coatings with delamination’s from the substrate to be protected. The program is written in Kotlin using JavaFX platform and is focused on tests carried out by the method of lattice cuts within the conditions of paint and varnish production. Through the work the evaluation of the area of the coating detachment from the surface to be protected is being held and the obtained result is scored by points according to the method of lattice cuts. The use of the program does not require a large computing power of the computer and reduces the time for obtaining the calculating results for one sample from 20 minutes to 3 seconds.

Keywords: adhesion, lacquer coatings, notch method, Kotlin language, JavaFX

The developed structural diagram of the special calculator in modular design with increased resistance to external influencing factors based on the 1892VM8Ya "Multikor" processor designed for use in onboard avionics systems is presented.

Keywords: Calculator, processor, MIL-STD-1533, controller, PLIS, microcircuit, special resistance

Considers issues related to software modeling is an important part in the implementation of the diagnostic system in an existing petrochemical complex. Considered the most popular types of software modeling. The article focuses on the analytical review of software modeling methods, advantages and disadvantages. The stages of software modeling are shown. Using the example of studying the software of the vibration diagnostics system of a gas pumping unit, it is shown the advantage of applying the methods of studying a dynamic discrete system with random delays using a mathematical apparatus that describes a stochastic Petri net and a Markov chain.

Keywords: technical diagnostics, petrochemical complex, gas pumping unit, automatic control system, simulation, dynamic discrete system with random delays, software, stochastic Petri net, Markov chain, statistical characteristics

Computer security is one of the key tasks of our time. Attacks on equipment in the network are constantly and leave large damages in the integrity of the data. There are many methods of computer security, one of which is the method of security through obscurity. The article analyzes the actions of system administrators to ensure server security using the “security through obscurity” method.

Keywords: computer security, security through obscurity, cryptography, decoding, setting up web servers

This paper presents the functionality of the software, which are recommended for use in the case of developing an information system for an enterprise. Such functionality is helpful in order to save working time of system administrators and company cash in the future. Attention is paid to the access control based on roles, to a mechanism for self-updating, to logging of user operations, and to the creation of a separate administration panel.

Keywords: information system, enterprise, access control, roles, update, logging, Microsoft SQL Server, administration, system administrator

A finite-element analysis of the stress-strain state of the bank-protection structure of the type anchor bolveverk with various types of external force is performed. It has been established that the adopted geometrical parameters of the structure provide the required margin of safety and ensure the stable operation of the object in the entire range of design loads. Practical recommendations are formulated for adjusting the design structure of the bollard (biteng).

Keywords: finite-element method, stress-strain state, Ansys Mechanical, banked fastener type building, bollard

The article is devoted to modeling the operation of a piezoelectric generator (PEG) in the form of a round bimorph plate with two piezoactive layers and an inertial mass. The considered PEG can serve as an element of the energy storage device, as a source of electrical energy obtained from the vibrations of structural elements and machines. The bending axisymmetric oscillations of a composite elastic and electroelastic body are considered in a linear formulation, taking into account the dissipation of mechanical and electrical energy. The problem is solved using the finite element method (FEM) in ACELAN. Statement of the problem simulates the fixation of PEG in a moving structure. A modal analysis of the device was carried out, the first frequencies of resonance, antiresonance, and electromechanical coupling coefficient were found. Next, the problem of forced harmonic oscillations at the first antiresonance frequency is solved and the output electric potential is determined. The dependences of the output characteristics of PEG on its geometrical parameters are constructed.

Keywords: piezoelectric generator, energy storage, electric potential, finite element method

The article shows the possibility of describing complex objects with parallel functioning components in the form of structures built on the basis of neural networks. The neural network is represented by an operator matrix, that is, a formal description that gives a universal way to solve many non-standard control problems. Matrix apparatus is shown to significantly improve the efficiency of the method compared to previously known. It is concluded that the representation of the neural network by the operator matrix provides a universal way to solve the problems of transport and information flows management; neuron-like systems based on such representation of the neuron are able to catch complex nonlinear relationships, self-improvement, learning in the process of use. Their use provides ample opportunities for finding and implementing effective solutions to the problems of management and control of flows

Keywords: graph, parallelism, transport and information flow, neural network, synaptic weight, predicate, activation function, operator matrix, neuron, complex systems

This article deals with the issue of the installation of traffic lights on the urban road network. A technique has been developed to select the method for controlling pedestrian traffic lights, and a model has been proposed for determining conditions for regulating pedestrian and traffic flows depending on intensity. The installation parameters of traffic and pedestrian traffic lights

Keywords: светофорные объекты, заторовая ситуация, пропускная способность, методика управления движением, безопасность движения, регулирование транспортных потоков, эффективность дорожного движения, аварийность, экологическая безопасность, интенсивность движения

This paper presents a mathematical model of an electro-hydraulic vibratory exciter used for vibration testing of steel piles on coral reefs. Based on this model of electro-hydraulic vibrator, we have built characteristic curves to evaluate the stability of the system, the quality of the transition process, as well as parameters - amplitude, frequency. The research results are the scientific basis for design of electro-hydraulic vibratory exciter for vibration testing of steel piles in the coral foundation.

Keywords: vibration exciter, electro-hydraulic vibrator, frequency

On the basis of the mathematical apparatus of Queuing, a mathematical model for the diagnosis of the technical condition of vehicles with electronic control units. The developed mathematical model of vehicle diagnostics in the framework of discrete-event paradigm. Numerical experiments to assess the effectiveness of diagnostics are carried out.

Keywords: cars, electronic control unit, diagnostics, Queuing system, efficiency, operating costs

The article is devoted to the actual problem of overcoming the restrictions imposed by the IP Protocol and network technologies used in conjunction with it, in particular, address translation, on the structure of computer networks and the availability of its individual nodes. It proposes a method of building virtual network tunnels based on the principles of steganography using service network protocols, briefly describes the shortcomings of existing technologies of tunneling. The paper describes in detail the proposed method of steganographic encapsulation of network packets, describes the principles of formation of packet headers, provides examples of protocols for encapsulation. The material of the article is presented consistently, competently and meets the generally accepted requirements for scientific works. The presented approach to solving the problem of building virtual tunnels has scientific novelty and has practical value.

Keywords: Encapsulation, Internet protocols, multilevel network models, steganography, steganographic packet encapsulation, tunneling

The article is devoted to the actual problem of increasing the complexity of user passwords in systems with remote access to increase their information security. It proposes a method based on the integrated application of the input characters of the password and the time intervals between them. In the article, using the inhibitor time network Petri, a model of a dynamic password setting process was constructed, on its basis the process of forming a reference image and user authentication is described. The above calculations of increasing the complexity of the password prove the effectiveness of the proposed approach.

Keywords: authentication, password, dynamic process, Petri net, complexity, password retrieval

In this paper the issue of improving the quality of training for specialists in the field of information security through the use of a specialized training system in education is considered. An overview of existing analogues of such training systems is given (including online games, tests, choose-your-own-adventure style games etc.). The main aspects of the development of an automated training system are given. The requirements for a focus group for testing an automated training system are formulated.

Keywords: training system, automated training system, information security, data protection, simulator, training, development, programming

The enormous wood resources of the forests of Russia and foreign experience indicate the need for innovative development of the country's forest industry. In this regard, it is necessary to determine the most promising areas for the development of logging. The results of the system analysis revealed the universities that are most actively involved in research and development in the forest industry, as well as important areas of this research and development.

Keywords: research and development, forest industry, scientific and technical information, development directions, system analysis

This article discusses the economic approach to the choice of the mode of continuation of the system in the face of partial failure. It discusses strategies related to the continuation of work in conditions of partial failure or cessation of operation until the completion of the operational restoration process. The characteristics of each of the strategies are presented in a comparative aspect for the continuation of the operation of the object in the post-failure period or the delay in operation for the duration of the restoration. The dependence of the time recovery parameters and the times defining the moment of identifying a partial failure in the coordinates of the time axis from the beginning of the working cycle to the next scheduled maintenance has been revealed. The resulting mathematical expressions allow, under certain conditions, to justify the choice of one of the two strategies considered. For more complex cases, it is proposed to use expert approaches to take into account additional characteristics of the process, such interregional period, performance and acceptable risks associated with working in conditions of partial failure. The article provides graphs illustrating the change in reliability characteristics in two ways of developments of events related to the adoption of a decision to continue work.

Keywords: partial failure, the coefficient of gain in terms of work, the probability of uptime, recovery time, time in the post failure period

As with any other technological advancement in use in today’s age, security threats are proving to be the major challenges and risks. Knowledge about these security vulnerabilities presents an avenue of protecting organizational assets against virtual attacks. VoIP phone systems are becoming increasingly popular in today’s society for business and personal purposes. VoIP services are increasingly productive and cheap, thereby, providing adopters a competitive edge. The paper explores a brief overview of VoIP techniques including network components, structure, standards and protocols, data processing techniques and quality of service.

Keywords: VoIP, VoIP components, VoIP structure, Cybercrime, Computer security

The method of layer-by-layer build-up of the material allows creating parts of complex configuration.To expand the field of application of such parts in the industry, it is necessary to know the properties of products obtained by this wayvery well. Currently, the literature sources do not provide enough information about the properties of products obtained by 3D printing on FDM-technologies.This is due to the variety of materials used and printing modes.Data on mechanical properties, such as tensile strength, bending, compression, shrinkage, specific weight of the material, will allow designing and creating real structures using 3D printing.The article considers the extrusion method of 3D printing, describes the study of tension, compression, bending, specific weight, shrinkage of samples with different structures obtained from ABS plastic.It is found that the deformation of the material during its tension depends on the number of filaments on the shell of the surface layer and reaches the highest values for samples containing eight and ten filaments. The calculation of the specific weight of the samples shows that the density of the samples with a tetrahedral structure is higher compared to the hexahedral structure at the same printing and filling modes. In determining the ultimate compressive strength of the samples, it is revealed: the higher the percentage of sample filling material, the more the sample withstands compressive stress. Experimental data on material shrinkage show that when filling the model with material from 20 to 80% shrinkage is 1%, and at 100% filling - 0.78%.

Keywords: additive manufacturing, 3D extrusion printing, mechanical property, FDM technologies, ABS plastic

Executed system analysis of the types of damage to logging machines and damage them in the manufacture. It is found that defects in material, shape and size of the part have a significant impact on the reliability of the equipment. The main attention is paid to the effect of crack-like defects. If as a measure of damage to take the length of the crack and apply the methods of fracture mechanics in the calculations, it will be obvious the relationship of operational and industrial damage. It is established that the main cause of failures of logging machine details of domestic production is not enough high quality of their production. It is recommended to use more widely such as characteristic of materials as fracture toughness to assess the reliability of the design.

Keywords: Logging machine, reliability, damage, manufacturing defects, fracture toughness

The features of the mechanism for preparing the technical plans of linear objects, including those located in several cadastral districts, are considered. The main problems arising in the process of preparing technical plans for linear objects and the factors affecting them are formulated. The problem of the lack of a sufficient regulatory framework in the field of regulating relations arising from the state cadastral registration of linear real estate objects is indicated. It justifies the need to refine the requirements for the technical plan of the property, namely, the linear object, as well as the form of the technical plan itself. Suggestions were made to optimize the mechanism for preparing technical plans for linear objects.

Keywords: technical plan, linear object, cadastral registration, cadastral engineer, construction

The computer technology for precious metals examination by method of colorimetry aided with auxiliary chemical reaction is created and investigated. The essentially new practical and methodical novation allowing to shift some orders lower the bottom limit of a measuring range is offered, the theoretical basis for micro- and macroanalysis computer technology is established. Experimentally confirmed, that with the help of new technique it is possible to detect micro probes of silver, gold, platinum and palladium about 10-9 g. It is acceptable to use the proposed technology for quantitative estimation of other substances representing interest in this or that area of expertise.

Keywords: examination, macroanalysis, microanalysis, colorimetry, computer technologies

The article deals with the work of mechanical absorbers, where the working body is presented in the form of a rotating cylinder. The analysis of interaction of liquids and a working body in similar devices is made. The mutual influence of liquid layers and the action of the working body are considered. The estimation of the force factors of the dynamic layer entrained by the rotating cylinder is obtained. The study presented in the article will help in the preparation of engineering methods for calculating the operating and design parameters of devices.

Keywords: absorber, emulsion layer, capillary forces, emulsion, static meniscus region, capillary pressure, immiscible liquids, rotating cylinder, liquid, Navier-Stokes equation