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  • Reviews, suggestions and discussions

  • Trends in the development of digital technologies in the organization of construction production

    The article provides an overview of the applied digital technologies in construction, the problems of their development.

    Keywords: digital technologies, BIM model, 3D printing of buildings, construction production, estimate, 3D scanning

  • Retrospective analysis and review of foreign experience in designing sports and leisure centers in urban development based on sports centers and cultural and leisure centers

    Based on available literary and photographic sources, a retrospective analysis of the main ancient Greek public buildings was carried out, as well as architectural spatial and planning solutions and features of the formation of modern sports and leisure centers (SDC) on the basis of cultural and leisure centers (KDC) were analyzed. SDC, as a special case of KDC, is a unique structure that obeys uniform principles of formation, identified on the basis of foreign design of KDC in urban development, is a point of attraction of the population, characterized by a variety of functional components as part of multi-level, physically unified spaces, with a predominance of function, which is a specialization of the center, adapted to the leisure of the population and adapted to the needs of low-mobility groups of the population. It is concluded that it is necessary to develop similar TPC projects for domestic design experience.

    Keywords: sports and leisure complex (SDC), cultural and leisure complex (KDC), urban development, point of attraction, leisure, scale of development, complexity of development, design trends, urban planning trends, planning trends, engineering and technical trends

  • An overview of service tools based on machine learning for writing program source code

    In recent years, the use of various tools based on machine learning in the process of writing the source code of various programs, interfaces, and websites has been gaining momentum. These include programs that help in testing applications, programs that analyze the developer's code, as well as assistant programs that help write code right in the process, predicting and prompting the developer with options for the finished program code. In this article, just the same, such assistant programs will be considered in order to analyze the shortcomings and justify the need to develop functionality in this direction.

    Keywords: source code, machine learning, neural networks, application testing problem, natural language processing

  • Research experience of foreign engineers on strengthening wooden structures with composite materials

    This article presents the main achievements of the foreign engineering school in the field of research and application of composite materials to reinforce wooden structures. Some options for reinforcing glued and solid wooden elements are considered. The results of tests of reinforced wooden structures are analyzed. Errors made during the manufacture of samples and the course of testing are noted. Conclusions are drawn on the basis of the conducted research.

    Keywords: wooden structure, prestressing, composite beam, tensile zone, carbon nanotubes, load-bearing capacity, epoxy matrix, carbon fiber, lamella, rebar, wood collapse

  • Physical and mathematical sciences. Physics

  • The physical basis for determining the complex wavenumber for electromagnetic waves propagating through a layer of carbon fiber

    The conclusion of the relations for the study of the propagation or diffraction of electromagnetic waves in the semiconductor layers of composite materials, which are also recommended to be used in the creation of onboard antennas and microwave devices with less weight. Both exact and simplified mathematical expressions for the rapid quantitative estimation of the complex wave number are obtained. Using the example of carbon fiber plastics with high conductivity, it is shown that their use makes it possible to create waveguide paths and antenna reflectors up to a millimeter wavelength range.

    Keywords: carbon fiber, electrodynamics, composite, propagation, absorption, antenna

  • Physical foundations and results of the study of absorption in thin films of germanium doped with silicon

    Theoretical relations are presented that serve to estimate the absorbing properties of thin optical films using functions that determine the envelopes of interference extrema in the transmission spectrum of a thin optical film on a plane-parallel transparent substrate, as well as the experimental results of estimating infrared losses in Ge films doped with Si.

    Keywords: interference, absorption, optics, film, refractive index

  • Technical science. Informatics, computer facilities and management

  • Features of the development of transport corridors in the space of the countries of the Eurasian Economic Union

    The article discusses the features of international transport corridors passing through the territory of the countries of the Eurasian Economic Union, analyzes the potential and problems of their development, identifies their prospects for the implementation of large transport and logistics projects. Despite the great attention of scientists from different countries to the issues under study, the issues of the functioning of international transport corridors and their integration into the global transport system require further study.

    Keywords: logistics, logistics directions, transport corridors, Eurasian Economic Union, transport routes

  • Development of a combined heat source with an external chamber and an intermediate circuit on carbon dioxide

    The paper proposes and calculates a scheme of a two-stage gas turbine plant using carbon dioxide as a working fluid in the second stage and using heating of the CO2 circuit, as well as heating water sent for heating. As a result, the following were calculated: for the first stage turbine: parameters of fuel combustion products; air compressor parameters; fuel compressor parameters; combustion chamber parameters for a real Brayton cycle; Efficiency of the first stage turbine; for the second stage of the gas turbine: a schematic diagram was drawn up using liquid CO2 as a working fluid; calculation of CO2 parameters at key points of the Brayton cycle; the efficiency of the turbine of the second stage is calculated.

    Keywords: energy efficiency, gas turbine plant, carbon dioxide, pressure, pressure ratio, combustion chamber, recuperator

  • Nonlinear Magnet Shielding Coefficient Meter

    The article describes a device designed to measure the shielding coefficient of a magnetic field in the near zone and its dependence on the frequency of changes in the magnetic field. The screening coefficient is measured taking into account the nonlinearity of the characteristics of the material from which the magnetic screen is made. The test action generation module sets the current flowing through the coil containing a superposition of DC and AC signals. The presence of a constant component in the test exposure makes it possible to compensate for an external constant or slowly changing magnetic field and thereby reduce the error in determining the shielding coefficient. The results of measuring the frequency dependence of the magnetic field shielding coefficient in the near zone, as well as the main characteristics of the created device are presented.

    Keywords: screening coefficient, nonlinear magnetometer, screening coefficient meter, magnetometry, digital attenuator, hall magnetometer, magnetic field compensation

  • On the issue of using components from Android Architecture Components in a mobile application on the Android platform

    Mobile applications are widely used by many people in everyday tasks. Every year there is an increasing need for more functional, convenient and reliable software tools that can provide fast and safe work in various fields. But to develop such an application, it is necessary to use an architecture that meets all the requirements. In this paper, we will talk about the use of components from Android Architecture Components developed by Google, which allow you to implement some design patterns taking into account the features of the Android operating system. The article will provide a list of the most used components, as well as a brief reference on their functionality. The work of one of the components with the basic elements of the Android operating system is considered. The interaction of components is also schematically shown by the example of the implementation of one of the design patterns.

    Keywords: application architecture, Android Architecture Components, application, android

  • Research of the fog effect on machine vision systems

    In this work, we studied the effect of fog on machine vision systems, in particular, on the correctness of the pattern recognition algorithm. As part of this work, a filter is implemented that eliminates distortions caused by fog. A corrective filter has been developed, an analysis of the operation of a neural network with images of various definitions has been carried out, on the basis of which recommendations have been made to improve the accuracy of pattern recognition.

    Keywords: image processing, image filtering, machine vision systems, pattern recognition

  • Existing approaches to automating the process of drying materials in the fluidized bed mode

    The presented paper provides an overview of approaches to automation of the drying process in the fluidized bed mode. The technological process of drying potassium chloride in a fluidized bed apparatus at a potash plant is considered as an object of control. During the analysis of the control object, it was noted that, according to the generalized opinion of the technical staff of the production in question, standard control algorithms (PID controllers) are not effective enough in the task of automatic control of the thermal regime of the potassium chloride drying process. The control of the thermal regime in the production under consideration is carried out by the operational personnel in manual mode, by manipulating the flow rate of the drying agent. The need to simultaneously solve and take into account many different kinds of process control tasks in the drying compartment leads to the fact that the operator is physically unable to constantly ensure accurate maintenance of the thermal drying regime in accordance with the regulations in conditions of fluctuations in the consumption of wet crystallized, which reduces the quality of the drying process control and leads to overspending of fuel gas. Analysis of the conditions and results of the operation of the production in question showed that standard algorithms are not able to provide the required quality of process control. The use of more advanced methods and algorithms of automatic control is required. A review of literature sources shows that the solution to the existing problem can be found based on the use of algorithms that meet intelligent automatic control systems. One of the modern approaches to automation of complex, informationally weakly deterministic technological processes is the intellectualization of the control system. Intelligent control algorithms are considered to be built on the basis of models for the representation of expert knowledge. Such algorithms are able to maintain operability in conditions of non-stationarity of process variables and incompleteness of the observed information about its state." "The presented paper provides an overview of approaches to automation of the drying process in the fluidized bed mode. The technological process of drying potassium chloride in a fluidized bed apparatus at a potash plant is considered as an object of control. During the analysis of the control object, it was noted that, according to the generalized opinion of the technical staff of the production in question, standard control algorithms (PID controllers) are not effective enough in the task of automatic control of the thermal regime of the potassium chloride drying process. The control of the thermal regime in the production under consideration is carried out by the operational personnel in manual mode, by manipulating the flow rate of the drying agent. The need to simultaneously solve and take into account many different kinds of process control tasks in the drying compartment leads to the fact that the operator is physically unable to constantly ensure accurate maintenance of the thermal drying regime in accordance with the regulations in conditions of fluctuations in the consumption of wet crystallized, which reduces the quality of the drying process control and leads to overspending of fuel gas. Analysis of the conditions and results of the operation of the production in question showed that standard algorithms are not able to provide the required quality of process control. The use of more advanced methods and algorithms of automatic control is required. A review of literature sources shows that the solution to the existing problem can be found based on the use of algorithms that meet intelligent automatic control systems. One of the modern approaches to automation of complex, informationally weakly deterministic technological processes is the intellectualization of the control system. Intelligent control algorithms are considered to be built on the basis of models for the representation of expert knowledge. Such algorithms are able to maintain operability in conditions of non-stationarity of process variables and incompleteness of the observed information about its state.

    Keywords: fluidized bed drying, potassium chloride, control, process automation, PID, intelligent control algorithmsfluidized bed drying, potassium chloride, control, process automation, PID, intelligent control algorithms

  • Woven sensor systems for wearable wireless networks

    A comparative analysis of the possibilities of using woven composite materials with specified sensory properties as information and measurement systems of the industrial Internet of Things (IIoT) is presented. It is proposed to consider such woven sensor systems as a basis for building a network interaction environment for components of wireless wearable sensor networks, as well as systems for monitoring the stress-strain state of products made of woven composite materials. To impart sensory qualities to such multilayer 3D fabrics at the stage of their development, it is proposed to modify their structure by introducing threads, on the one hand, having the properties necessary for the formation of data transmission channels, and on the other, being piezoelectric sensors, whose signals allow monitoring the dynamics of changes in the stress-strain state of a woven composite material.The release of a functionally augmented 3D fabric in this way opens up real prospects for conducting a full-scale experiment to study the sensory properties of spatially extended products made of woven composite materials.

    Keywords: Wireless Body Area Networks, fabric sensors, textile sensors, Sensor Networks, E-textiles, Smart fabrics, woven composite materials, sensor data acquisition, Internet of Things

  • Developing a machine learning model for estimating driver eye condition

    Currently, special attention is paid to artificial intelligence systems in transport. One of the actual directions is the development of self-driving car. However, there is also an intermediate approach. When the control is not fully automatic and automated. In such systems a human plays an important role, but the system, analyzing data from the environment, allows to form various kinds of recommendations. Moreover, such systems allow to work on the warning in some situations. In particular, some driver monitoring systems allow to detect the fact of smoking while driving, turning your eyes away from the road. In this article, special attention is paid to the system of analysis of the driver's eyes. First of all, the results of such analysis can be used to determine the fact of falling asleep. However, by analyzing, the frequency of blinks, it is possible to predict sleep. Nevertheless, computing power is needed to build such a system. In this work, the performance is achieved by using Haar cascades and the Viola-Jones method in eye detection. The eyes detected in the video are images of a much smaller size compared to the whole frame of the video sequence, due to which high performance is achieved in their processing by the convolutional network in the next step. Structurally, the system consists of two neural networks operating in parallel for the left and right eyes. The obtained values of completeness are about 90%.

    Keywords: computer vision, artificial intelligence, security system, face detector, deep learning, target skipping, proportion of correct recognition, driver monitoring, eye recognition, Viola-Jones method, Haar cascades, optimization

  • Mathematical model of queuing system management with dynamic application service discipline

    In the work, using the queuing theory apparatus, a mathematical model for managing the reliability of software and special-purpose computer networks used in the system of ensuring the integrated security of institutions and UIS bodies is constructed. Computer networks and software can be considered as a managed queuing system in which management is carried out by managing the discipline of servicing applications and its structure, changing the intensity of queue servicing, introducing control actions on the flow of applications or in another way. The paper for the first time proposes an approach according to which the optimization problem of the controlled queuing system under consideration with a dynamic discipline of application service is formulated as an optimal control problem with phase constraints and can be solved using numerical algorithms.

    Keywords: special purpose software, controlled queuing system, Euler scheme, optimal control, rapid automatic differentiation method

  • Classifying and countering phishing attacks

    The article discusses the concept of phishing and its varieties. An analysis of phishing attacks for 2021 was carried out, which revealed an increase in their number, which indicates the relevance of the proposed measures to counter this type of threats, a browser extension was developed to ensure protection against mass and directed phishing attacks.

    Keywords: phishing, attack, social engineering, Phishing-as-a-Service, information security

  • Neural network approach to determining human emotions by speech

    From the point of view of practical value, the definition of emotions in a person's voice can be applied in various areas related to both the transmission of audio messages and online communication: such areas include medicine, security, economics, education, etc. As a striking example, we can provide an assessment of the quality of work of call-center operators, as well as the services / goods they offer. So the presence of signals that the client is experiencing negative emotions, for example, anger, can indicate possible problems with the operators. In this paper, a neural network approach will be considered for automatically determining a person's emotions from his speech.

    Keywords: neural network, emotion detection, speech, classification, deep learning, convolutional model

  • Hardware and software usb-hid device for controllthe pc cursor for people with impaired motor functions

    The use of information technologies in the tasks of medical rehabilitation is an effective method, but it is often complicated by the problems of using standard control devices and input into the computer by people with motor impairments. The developed hardware and software complex allows one to obtain data on the orientation of the joint in space, "turning" them into the movement of the mouse pointer, allowing one to interact with computer software, instead of the mouse manipulator. By changing the sensitivity of the sensors, the process of rehabilitation of patients is corrected. The used component base of the complex being developed and the technologies used make it possible to form a significantly lower cost, the possibility of using it outside the clinic, working without the help of specialists, application in control actions with computer software not only for rehabilitation but also for people with disabilities. The paper defines the tasks and functions that are solved by the hardware and software complex. In the 3D editor, the body frame and the internal arrangement of components are modeled, hardware and software tools are selected to ensure the implementation of the project. The functional scheme of the "Limbtracker" device has been developed. During the execution of the project, the following was implemented: reading data from sensors and writing them to a text file, filtering data by the Kalman algorithm, calibration of the device.

    Keywords: hardware and software complex, home rehabilitation, neurorehabilitation, STM32, microcontroller, device design, USB-hid

  • On the variant of formalization of the task of determining the demand for training areas and possible areas of employment of graduates based on semantic analysis of job descriptions

    The article considers a variant of formalization of the task of determining the demand for training areas and possible areas of employment of graduates by comparing the skills obtained in the framework of training and the requirements of the labor market on the basis of semantic analysis of job descriptions. The formalized model is used for further algorithmization of the solution and software implementation within the module of the complex tools of remote career guidance.

    Keywords: API requests, vacancies, demand for training areas, career guidance, digitalization of career guidance activities, formalized model

  • The creation of car dealership activity information system

    The creation of information system for automation of sales in a car dealership is described. The life cycle first two stages are given. The analysis of the subject area and AIS design with the use of the methodology of the structural approach was carried out. IDEF0 AS IS model was built, using CASE technology BPwin. The analysis of this model allows us to identify its "bottlenecks" and formulate the TO BE car dealership model requirements. The re-engineering was done and TO BE model was built taking into account the identified shortcomings. DFD-diagram was constructed depicting the data flows in the projected information system . The database design in ERD-diagrams form was made on DFD basis. Using CASE-technology Erwin Data Modeler, one can create automatically the database structure in the selected DBMS MySQL in the form of linked tables totality. The user interface design of the car dealership information system was also made.

    Keywords: subject area analysis, design, information system, structural approach, reengineering, CASE tool, IDEF0 diagram, DFD diagram, ERD diagram

  • A method of collecting data using an oculoscope in the priority areas of sites

    From the point of view of practical value, data collection in priority areas of sites can be used by designers and owners of web resources to increase the conversion component of a web resource. Information about which areas on the site are most interesting to the user can indicate the places where the most important design elements need to be placed. In this paper, we will consider the method of data collection using an oculoscope in the priority areas of sites.

    Keywords: usability, view, website, eye tracker, heat map

  • The prospect of using automated process control systems with plasma coal burning in the Far North

    To consider the possibility of saving resources from the introduction of an automated process control system (APCS) of a boiler plant with plasma ignition of coal for increased efficiency in the conditions of the Far North. To investigate automated control systems for boiler installations with various options for preparing coal for plasma ignition of the boiler, to consider their main advantages and disadvantages. To substantiate the need for the introduction of automated process control systems of a boiler plant of increased efficiency. Based on the literature review and the results of the calculation of economic efficiency, to develop a plan for the implementation of an automated control system of a boiler plant of increased efficiency for the conditions of the far north.

    Keywords: energy resources, power engineering, boiler plant, automated control system