In the development of cloud providers, not only the types of services they provide play a significant role, but also fault tolerance to service failures. It is important for a cloud service provider to prepare and configure the server and service for fault-tolerant operation so that the customer works with a high degree of readiness and reliability in the system allocated to him. To prepare such a server, it is very important to think carefully about the architecture of the virtual machine, on which all the necessary means of data exchange and integration for the operation of the service will be installed, and protection against network threats that can disrupt the server's performance will be configured. The purpose of the work is to create a virtual machine architecture protected from network threats, which provides customers with access to the iTOP CMDB system. Despite the fact that there can be any number of customers, the iTOP CMDB system should be provided to each customer with its own version, which he can administer. The user can log in using an Internet browser by entering the name of his organization as a domain. The authors present a demonstration of the iTOP CMDB system, which is located on a virtual machine protected from network threats.

Keywords: virtual machine, architecture, firewall, iTOP CMDB system, server, network threat, network attack, IP address, firewall, request

The purpose of this study is to present the forestry complex development scenarios of the Republic of Karelia and the Murmansk region. Based on the use of factor analysis and cluster analysis, 27 central foresters of the study region were divided into 9 clusters according to 20 indicators. The selected indicators took into account the characteristics of wood resources, natural-production conditions and road infrastructure. Based on cluster profiles, as well as on topographical, climatic, soil map and vegetation maps, scenarios for the development of the study region forestry complex in the context of the resulting clusters. The results of the study showed that as they move from south to north, a gradual impoverishment of wood resources occurs. The efforts of the state and business should be aimed at resolving issues of road infrastructure, involving deciduous, small, energy wood in production circulation. Given the natural and production conditions, which are largely determined by the moist forest soils and the extreme vulnerability of the northern ecosystems, in the process of logging, it is especially necessary to pay attention to the minimization of the negative impact of logging operations on the soil cover.

Keywords: zoning, forest industry, factor analysis, cluster analysis, k-means cluster analysis, logging, forest management

The article examines the influence of various superplasticizers on the performance characteristics of concrete. A series of tests of samples-beams of fine-grained concrete modified with plasticizers of various types was carried out. The optimal amount of the introduced additive was experimentally determined to compare the plasticizing effect of the cement-sand mixture. Experimental data are given indicating the main operational characteristics of the material depending on the additive used. The most effective additive "Polyplast SP-3" has been determined.

Keywords: concrete, fine-grained concrete, mixture, lignosulfonates, polycarboxylates, naphthalene sulfonates, plasticizer, superplasticizer, water demand, plasticity

The paper presents the results of a study, the purpose of which was to automate the process of designing ventilation for a residential construction project. The ventilation system is one of the most complex life support systems of a building, which has a significant impact on the level of comfort of residents. Automation of the design of such a system will reduce the number of errors, reduce the time and labor required for design. During the study, the design process was considered as a business process consisting of individual works. When modeling this process in the “As Is” notation, the connection of the ventilation system with other engineering systems and a number of other important factors were taken into account. In the process model, the most time-consuming and, at the same time, algorithmizable works were identified. Subsequently, these works were automated using code created in the Visual Studio environment in C#. This made it possible to reduce the number of errors and reduce the time spent on creating a ventilation system project.

Keywords: automation, design, ventilation system, business process, Visual Studio

The paper analyzes and shows the inadequacy of the technology for repairing production wells by rolling out a corrugated metal patch with a dornating device, which consists in premature violation of the tightness of the well due to low strength of the connection. A technology and a hydromechanical device for additional fastening by radial extrusion of spherical cavities in the metal of the plaster are proposed. As a result, a drag force is generated in the cross-section of the fastener, which prevents shear loads from axial forces. Strength calculations have shown that for better performance of the metal patch, it is advisable to increase the shear resistance force by increasing the number of punches or technological transitions of fastening.

Keywords: casing, production string, well tightness, metal plaster, radial extrusion, strength

This article discusses the use of universal adversarial as well as to improve the effectiveness of protection systems against robots and spam. In particular, the key features that need to be taken into account to ensure an optimal level of protection against robots and spam are considered. It is also discussed why modern methods of protection are ineffective, and how the use of universal adversarial attacks can help eliminate existing shortcomings. The purpose of this article is to propose new approaches and methods of protection that can improve the effectiveness and stability of protection systems against robots and spam.

Keywords: machine learning, clustering, data recognition, library Nanonets, library Tesseract

In this paper, the possibility of applying graph neural networks (NN) to study the structure of copper centers of zeolites is considered. The dataset used for NN training was prepared using the FDMNES software based on the finite difference method and included more than 2100 Cu K-XANES spectra for Cu-MOR. The performed study demonstrated the capability of graph neural networks to reproduce the Cu K-XANES spectrum corresponding to a particular model of the copper center in the zeolite framework.

Keywords: zeolite, mordenite, atomic structure, XANES, machine learning, graph neural networks

The article discusses correlation methods of image identification. An algorithm of the "rare grid" method has been developed.

Keywords: image identification, algorithm, recognition, cutting, reference frame, element correlations, minimum search

The actualization of industrial development in the Far North poses many key tasks to the construction industry. Concreting is one of such tasks, the performance of which is much more difficult during construction at low temperatures. Based on this, it is necessary to design and develop innovative tools to optimize or rationalize work on construction sites in these conditions. The scientific significance of the presented article consists in an attempt to design a software solution that allows au-tomating the calculation of the parameters of the heating wire during winter con-creting. The practical value of the work lies in the possibility of using the presented materials as a basis for the practical implementation of this program.

Keywords: сonstruction, Far North, calculation automation, heating wire, program, algorithm, winter concreting

Maintaining the optimal age structure of the forestry fund is an important factor in the use of forest resources. The purpose of this study was to analyze the age structure of the forestry fund of exploitation forests of the Republic of Karelia. For this purpose, data on the age structure of the forest fund by species groups was collected for 17 central forest districts of the study region. Data sources were forest planning documents. The results of the study showed that coniferous forests predominate in the Republic of Karelia. Deciduous tree species are more widely represented in the southern part of the study region. Deciduous and coniferous forests have different age structures. Young stock, mature timber and overmature forest predominate. At the same time, Young stocks are predominantly represented by coniferous forests. A small proportion of forest approaching maturity is one of the fundamental problems of the region under study, as it helps to curb the increase in logging volumes.

Keywords: forest resources, logging, age structure, coniferous species, deciduous species, ripening forests

No modern metropolis can be imagined without such public transport as the subway. The subway is the most important element of infrastructure for large cities and provides a convenient, fast, safe and environmentally friendly way for the population to travel. The construction of the subway is a long and complex process, which requires large investments and consideration of many factors. During the construction of metro stations it is necessary to carry out work on laying utilities, such as electric cables, pipelines for water supply, sewerage, ventilation and other systems. These utilities ensure the operation of the stations and comfort for passengers. Erection of engineering networks in the subway is a complex and multi-year process that requires application of new technologies and high qualification of specialists. However, proper planning and work coordination can significantly reduce time and costs of the project, ensuring uninterrupted operation of metro stations in the future. The work is devoted to the peculiarities of construction of the Moscow subway, which is considered one of the largest subways in the world in terms of length and passenger traffic.

Keywords: metro, utilities, high voltage cable, ventilation shaft, tunnel fan

The purpose of this study was to assess the forest exploitation conditions of the central forestries of the Republic of Karelia and the Murmansk region. To do this, data were collected for 27 central forestries of the study region, representing 20 variables characterizing indicators of wood resources, natural production conditions and road infrastructure. The assessment of forest exploitation conditions was carried out on the basis of the developed system of indicators, which includes 5 indicators: the value of the exploitation fund; the representativeness of the territory to the natural conditions of growth of deciduous species and the level of allowable cutting area for softwood farming; representativeness of the territory with favorable natural and production conditions in the study region; size of allowable cuts for coniferous economy; and the quality of the road network. The indicators were factors extracted by the method of principal axes in the process of factor analysis. Factors explained 81.4% of the total variance of the 20 variables initially selected. The results of the study showed that two groups of forest areas are distinguished in terms of the average forest reserve: the forest areas of the Murmansk region, which are characterized by a low average reserve, and the forest areas of the Republic of Karelia. Four central forestries located in the southern part of the Republic of Karelia are distinguished by the level of reserves in the forests of deciduous tree species and the level of allowable cut for deciduous farming. The most favorable natural and production conditions are forest areas located in the southern part of the Republic of Karelia.

Keywords: logging, natural and production conditions, factor analysis, Karelia, Murmansk region, timber resources

The expediency of using a finely ground mineral additive from burnt mudstone clay for the production of heat-resistant expanded clay concrete based on Portland cement with a rational dose of the additive of 30...50% by weight of the binder is shown. Compositions of heat-resistant expanded clay concrete with a maximum permissible application temperature of I10 classes in compressive strength up to B15 and an average density of up to 1500 kg/m3 have been developed. The efficiency of the technology for obtaining heat-resistant expanded clay concrete using pre-forced electric heating of the concrete mixture up to 60°C is substantiated and rational technological parameters of electric heating are determined. The residual strength of heat-resistant expanded clay concrete obtained using the developed technology, after short-term heating to 1000oC, exceeds 0.65 of the initial, which is higher than the values for analogues according to SP 27.13330.2017. The coefficient of linear temperature expansion of the developed heat-resistant expanded clay concrete in the temperature range of 200...1000oC varies within 2 ...5,8ˑ10-6 1/oC. The increase in the coefficient of thermal conductivity of the studied concretes with an increase in temperature up to 1000°C is up to 34%. The heat resistance of heat-resistant expanded clay concrete at 800oC, obtained using the technology of pre-forced electric heating of the mixture, was 12, 14 and 15 air heat changes, respectively, at a temperature of pre-forced electric heating of 60, 80 and 90 оC.

Keywords: heat-resistant expanded clay concrete, fine-ground mineral additive, mudstone, thermal conductivity coefficient, coefficient of linear thermal expansion, residual strength

The paper considers a model problem of a combined thermal and diffusion process in silicon. The mathematical model of this process is an initial-boundary value problem for a system of linear partial differential equations of parabolic type. In this system, one equation describes the process of heat propagation in silicon, and the other describes the process of impurity diffusion in it. In this case, the equations are not independent in the same way that the diffusion coefficient depends on temperature. For each equation in this system, the corresponding initial-boundary conditions are set. An implicit difference scheme and the classical sweep method are used to find an approximate solution to the problem that has arisen. The paper presents a description of a numerical algorithm and exact calculation formulas for solving a discretized parabolic problem.

Keywords: model of thermal diffusion process, numerical simulation, sweep method, implicit difference scheme

The article discusses the method of recognizing contours in the primary image. An algorithm has been developed for finding the absolute minimum of functionality in an image.

Keywords: contour, algorithm, defect, recognition, cut, reference frame, minimum search