This paper presents the results of a study of the interaction of the wheel tire with the support surface of the support-running module during the movement of the wheeled vehicle. The creation of a mathematical model of the movement of the wheel on the support base of the support-running module is given. For this, a design scheme for the movement of the wheel along the supporting surface of the support-running module was presented, and the following equations were given: the dynamics of the drive wheel; normal reaction and reaction vector of the interaction of the wheel tire with the support base; partial slip friction coefficient for cohesive soils and slip coefficient. Simulation modeling was carried out using the MATLAB Simulink environment, which allows, on the basis of a given mathematical model, to study the system being developed. When using this system, there is a reduction in the cost of expensive physical prototypes and an increase in the quality of products, as a result of an increase in the accuracy of calculations.
Keywords: wheel tyre, suspension module, wheeled vehicle, MATLAB Simulink, mathematical model, modeling
The paper considers the use of an artificial neural network for modeling a control system for extinguishing large fires in the institutions of the Penal System, considered as a queuing system, for calculating the parameters of which a trained neural network can be used, which allows to quickly assess the effectiveness of the system in rapidly changing conditions.
Keywords: emergency response, fire safety, queuing system, artificial neural network
With the right approach, the heat generated by chillers in an indoor ice rink can be used to melt ice, a dehydration system, or to heat a concrete pad under a layer of ice. In this way, energy can be saved. For the purpose of accumulation and subsequent distribution of thermal energy in the building, a reservoir that accumulates heat can be used. Heat is removed from the chiller condenser by a water cooling circuit, which is connected to the coil of an indirect heating boiler (heat accumulator). The coil heats the water that circulates in the heating circuit. Since the load on the ice can change during the day, heat extraction will occur in different amounts. For efficient transfer of thermal energy from one heat exchanger to another, it is necessary to control the speed of rotation of the pump impeller so that the controlled function is maximum. If the speed is insufficient, then the heat exchange flow will receive less heat. On the contrary, if the drive drives antifreeze too quickly, then the coolant will not have time to heat up. A mathematical model of the system was compiled from a plant condenser and a boiler with heated water, a dependence on the speed of the coolant (antifreeze) and the temperature difference at the inlet and outlet of the accumulator was revealed.
Keywords: heat accumulator, temperature control, shell-and-tube heat exchanger, optimal regulator, freon
This paper presents the principle of operation of the algorithm for translating a graphical representation of neural network models into a program code within the framework of a neural network repository. Based on the obtained data structure, it is possible to carry out sequential generation of program code in a general-purpose programming language.
Keywords: neural network model, neural network, repository, graph model, programming, translation, spatial data, algorithm, topology, architecture
This article discusses the issues of collecting, processing and analyzing information flows in the operational communication channels of the fire service of the Ministry of Emergency Situations of Russia on the example of the territorial fire and rescue garrison of the Volgograd region.
Keywords: operational communications, fire and rescue garrison, crisis management center, dispatcher, information load, special line "01", information and telecommunication technologies, FPS detachment, fire protection units
Meta- and hypergraph representations allow reducing the amount of processed data without losing the original information. This advantage determines the most promising area for their application: the problems of big data analysis, provided that this data can be described using a graph representation. The article proposes an approach to modeling hierarchical systems based on nested metagraphs. Category theory is used to eliminate ambiguity in the interpretation of concepts. Formalized descriptions of static and dynamic nested metagraphs, methods for defining them, as well as basic operations are given. The basis of concepts, nested metagraphs is a monoid, as an information object, which is characterized by an internal form, internal and external contents. Thus, a monoid is a generalization of a graph structure and is interpreted as a vertex of a generalized graph.
Keywords: nested metagraph, metagraph monoid, metagraph adjacency matrix, operations on nested metagraphs
The article is devoted to the problem of forming a set of corrective measures to deal with a set of the bank's arrears contracts. The problem at hand is topical practically for each bank. Formed set of measures should be adapted to the time and resource capacity of the employees of bank's specialized subdivision, to the predicted effectiveness of the measures and to the requirements of the bank's policy of customer loyalty. The proposed method of solving the problem of managing the contracts of arrears portfolio is based on a multi-criteria optimization model. Multicriteria is explained by the need to consider various criteria of efficiency and predicted effectiveness of the formed set of corrective measures. In order to find the optimal solution for the multi-criteria task, a special genetic algorithm is developed. The algorithm forms a set of non-dominant alternative solutions, which can be chosen by a decision maker. The article gives a brief description of the main steps of the proposed genetic algorithm and computational experiment on the basis of the developed software.
Keywords: Key words: arrears portfolio, multi-criteria optimization model, set of corrective measures, genetic algorithm, set of Pareto-optimal solutions
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
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
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 paper proposes a method for automatic classification of roads based on the use of a convolutional neural network Mask-R-CNN. The developed technique makes it possible to automate the task of categorizing roads, which is fundamental in the redistribution of traffic flows, since knowledge of the category of the road allows you to determine its maximum capacity. The article contains a description of the stages of training a neural network, as well as the results obtained when using it. The method of automatic road classification proposed in the paper showed good results both in classifying roads based on satellite images and in classifying roads based on photographs of road sections. When expanding the test set, the number of classes of recognized roads can be increased to match the categories of roads according to SP 34.13330.2021. In addition, this technique (in terms of segmenting objects in photographs) can be used to control the quality of the roadway.
Keywords: road categories, convolutional neural networks, satellite imagery, image segmentation, Mask R-CNN, image recognition, computer vision
Simulation modeling of university scientific activity indicators Based on the developed original algorithms, the results of simulation modeling of the main scientometric indicators of the university and determining its place in the ranking of scientific activity are presented. The influence of the input control parameters of the system on the output integral indicators of the functioning of the university is analyzed, which allows us to propose projects of management solutions to achieve the planned values of indicators of scientific activity.
Keywords: simulation modeling, performance indicators, universities, scientific activity, publication activity, Web of Science, Scopus, RSCI
Automation of test question generation consists of four main stages. The first step is to determine the target sentence from which it will be possible to generate a test question. This article examines the existing methods for determining the target sentence Both foreign and Russian language sources are considered. The paper considers such methods as automatic text abstracting, similarity of syntactic analysis, a rule-based method, a method based on ranking by keywords, an algorithm for summarizing documents based on the frequency of words.
Keywords: automatic test questions generation, automatic text processing, natural language processing, automatic abstracting, annotation
This article reports on the use of HPAW in AHS welding in the manufacturing industry. Fatigue durability of welded joints is investigated using these two methods. In addition, to find out the difference in fatigue life, an analysis is carried out both under an optical microscope and under an electron microscope.
Keywords: high-strength steel, hybrid plasma arc welding, gas arc welding of metal, fatigue, residual stresses
One of the most important problems of our time is the excessive emission of carbon dioxide into the atmosphere. The article proposes a mathematical model of the system for monitoring the emission of carbon dioxide into the atmosphere. The model is two-level hierarchically organized. Industrial enterprises act as a lower-level subject of management, and the state or its authorized body acts as a top-level subject. All subjects of management of the lower level seek only to maximize their gain. The main goal of the upper level entity is to maintain the quality of atmospheric air within the specified range. The problem is considered in a game setting. The Stackelberg equilibrium is constructed. The construction algorithm is specified, and it is programmatically implemented. An analysis of the obtained results is given, a number of conclusions are made about the optimal strategies of all participants in the system, based on the results obtained in the course of applying the Stackelberg algorithm.
Keywords: Stackelberg equilibrium, two-level hierarchical model, leading, trailing, carbon dioxide, Rosprirodnadzor, Federal Service for Supervision of Natural Resources
Increasing the throughput capacity of railroads is possible through the introduction of coordinate systems of interval regulation of train traffic based on satellite navigation equipment. Since the accuracy of coordinate determination by means of satellite navigation is unstable, it is proposed to use a local differential system of departmental purpose as a means to control the availability of navigation determinations GLONASS/GPS coordinate systems of interval regulation of train traffic. The method of differential pseudorange correction and the method of direct differential coordinate correction are considered. We analyzed the effectiveness of these methods in the Mathlad software package, using daily range measurements of stationary GPS stations located in Canada. The analysis showed that the method of controlling the availability of navigation determinations on the plane using direct differential coordinate correction is more stable and reliable in operation.
Keywords: satellite radio navigation, control of availability of the required navigation characteristics, accuracy of positioning in transport
The operating conditions of polycrystalline dielectrics in external mechanical and electric fields make it relevant to study the properties of such materials and their resistance to extreme loads, which depends on the processes of polarization reversal and the dynamics of the domain structure. Based on the model of motion of domain walls and the rheological model, equations are obtained for the dependence of polarization on the applied mechanical, electrical, or simultaneous electromechanical load. It is shown that the nonlinearity of the current in the ferroelectric ceramic is due to the dependence of the coefficients of the model on the through conduction current and the current associated with the emission of charges from traps. The physical meaning of the coefficients makes it possible to use their well-known dependences on the electric field and external mechanical stresses both in the range of the linear piezoelectric effect and in the region of external loads, when linearity ceases to exist. The obtained coefficients make it possible to pass from polarization (macroscopic parameter) to domain walls (mesoscopic scale). The parameters of the model depend on the change in the domain structure and its interaction with defects; therefore, the current relaxation time in the ferroceramic is described by changing the corresponding times for 180°-domains and non-180°-domains. The model considers two polarization components: elastic and irreversible. Changes in polarization after the external action of the electric field can be explained by the movement of domain and interphase boundaries. When a critical mechanical load is applied, the domain boundaries are detached from the defects and the crack grows abruptly, and as a result, destruction occurs. The relaxation motion of domain walls with constant friction leads to the growth of cracks due to the creation of mechanical stresses. The chosen rheological model and approach, taking into account the mechanisms of motion of domain walls, will make it possible to describe the rate of polarization change using the behavior of defects (dislocations, domain walls). The model will allow from a unified point of view to describe the experimental patterns of the behavior of currents under electromechanical action.
Keywords: ferroelectric ceramics, computer simulation, rheological model, polarization current, polarization current density, domain wall, 1800-domains, not 1800-domains, mechanical load, electrical load, relaxation time
The article considers the process of absorption with counterflow of phases with chaotic nozzles. Gas is supplied to the lower part of the column for separation, and liquid is supplied to the upper part of the column to irrigate the packing. In the packing layer, a film flow of the liquid phase occurs over the surface of the contact elements, and in the channels of complex geometry, the gas flow moves in countercurrent. Moreover, the film flow is usually laminar wave, and the movement of the gas phase is turbulent. Through the interfacial surface of the gas-liquid there is an exchange of momentum, mass and energy. Regular and irregular (chaotic) elements of various designs and sizes can be used as nozzles. The initial choice of packing design is carried out based on the ultimate loads that provide the film mode, and then refined based on the obtained efficiency of the process, which must meet the requirements of the technical specifications for the design or modernization of the apparatus. kind at the interface. However, such an approach is possible if the distribution of the interfacial surface area in space is fixed and known, for example, for film contacts of devices and some regular packings. Calculations of the process of air moistening with water were performed using the mass transfer equation (all resistance in the gas phase) in a column with a tubular packing with intensifiers. The efficiency of mass transfer obtained from the numerical solution is compared with experimental data, as well as calculations based on the ideal gas displacement model. It has been established that, taking into account the turbulence of the gas flow, the calculation of the efficiency is adequately consistent with the experiment, and the ideal displacement model slightly overestimates the values of the separation efficiency.
Keywords: absorption, mathematical model, column, packing with intensifiers
The paper discusses methods for improving the efficiency of perimeter security systems through the use of neural network signal processing technologies that serve to increase the information content of data coming from security detectors. The proposed approach allows not only to establish in a timely manner the fact of illegal actions to overcome the perimeter of the object, but also to classify the violator with a minimum level of false positives. Special attention is paid to the issues of optimal control of the reliability of signal processing units with a logical neural network analyzer, considered as queuing systems.
Keywords: integrated security, security detector, detection zone, signal processing unit, artificial neural network, neural network signal processing, reliability, queuing system, optimal control, maximum principle
This article describes the implementation of an orientation software package for a mobile robot with the construction of a terrain map and its subsequent analysis. As part of the work, a software module was developed for a mobile robot using a laser rangefinder (lidar), a Raspberry Pi 3B+ microcomputer with a ROS robotic operating system installed on it is used to obtain data from a laser rangefinder. The algorithm of movement of a mobile robotic complex in space with the construction of a terrain map in real time is described. Such complexes are currently widely used, they can significantly reduce the need for human participation in heavy and dangerous work.
Keywords: mobile robot, robotic complex, laser rangefinder, lidar, ultrasonic sensor, vision system
Automation of procurement activities is considered one of the most well-known applications of IT solutions, since procurement is an integral element of the work of any organization and must be a holistic, systematic process that provides the opportunity to receive all those products, works, offers and services that are so important to the organization with the least expenditure of resources and resources in time. The article highlights the list of functional capabilities of various systems and describes the results of a formalized analysis of the functional completeness of these systems of the procurement session. The analysis also included a conditional system with the desired functionality, according to which it will be clear how this or that system is suitable for the customer.
Keywords: procurement session, procurement activity, comparative analysis of functional completeness, auction, reduction, lot, bid, analysis of compliance of user requirements to systems, similarity of systems
In this article discusses the problems of determining traffic signs for driving a motor vehicle using an artificial neural network apparatus. The relevance of research at this point in time is described, as well as the advantages of using neural networks in determining traffic signs. The input data for determining traffic signs for convolutional neural networks are presented. The architecture of the convolutional neural classification network is formed, in particular, the sequence of layers of the image classification network is considered. A mathematical description of the modeling of the error function and the stochastic gradient descent method is given. A mathematical model of the learning process of an artificial neural network, as well as activation functions: linear functions and sigmoids is presented. An algorithm for forming an artificial neural network model is proposed. The learning process of this function is visualized on the graph. The result of the training is presented.
Keywords: artificial neural networks, classification, convolutional neural networks, deep learning, big data, mathematical modeling, informatics
The article is devoted to the review of food production planning models, the analysis of their features. For this purpose, the classification of models was considered, which included models with deterministic and interval parameters, and also took into account the influence of natural and man-made events. The article considers a model for optimizing the functioning of an agro-industrial cluster, presents models for optimizing the production of food products in agro-industrial clusters of the Irkutsk region.
Keywords: optimization methods, agricultural production planning model, deterministic and interval parameters
This article discusses the development of a universal mobile application "Signal "H"" for people with hearing and speech disabilities based on the analysis of existing mobile applications.
Keywords: fire, mobile application, communication, fire protection units, type of fire, people with disabilities
The article describes the architectural techniques used in the process of developing case studies for assessing the professional skills of students, implemented as part of the educational process of the RSTU. The decision to use the interface as the center of architecture is justified. Possible problems in the process of developing the interface of the specified software are described, and ways of solving them are also presented. Thanks to the presented methods of building the project architecture, you can get rid of the main drawbacks associated with the dependence of the program code of the implemented product on the user interface. Increase the scalability and reliability of the application, while maintaining the overall quality and functionality.
Keywords: interface, user interface, architectural solution, loaded interface, software, pattern, messagebroker, coroutine, pseudo-stream, case