bluuebunny/crossref_metadata_2025 huggingface dataset:
DYNAMIC CONDITIONS FOR INCREASING THE STRUCTURAL STABILITY OF THE WORKING MECHANISM OF A PLANETARY-ROTARY HYDRAULIC MACHINE
Authors: Volkov G. Yu. , Fadyushin D. V.
Published: January 2021

A structural feature of planetary-rotor hydraulic machines (PRHM) is the presence of floating satellites. The satellite forms kinematic pairs with the rotor and stator, which, depending on the applied forces, can change their class. In PRHM with “standouts” of satellites intended for gas media, the kinematic satellite-stator pair operates at critically high values of the pressure angle. Under the influence of the pressure force of the working medium, the satellite, taking up the radial clearance in the gearing, is shifted towards the rotor and pressed against it on both sides of the tooth, and the satellite-stator pair becomes a single-moving pair of class 4. The resulting satellite offset further worsens the conditions for transmitting motion in the satellite-stator pair. As a result, there is a probability of jamming of the mechanism, accompanied by unacceptable deformations, and the satellite's exit from engagement with the stator. From the point of view of the theory of mechanisms and machines, this means that the system loses its structural stability and goes into an undesirable structural state. The article studies the conditions under which inertial forces, overcoming the pressure forces of the working medium, press the satellite against the stator. This eliminates the situation when a kinematic pair characterized by a critically high pressure angle is single-moving. As a result of the performed dynamic analysis, calculated dependencies are obtained that allow determining the rotor rotation speed that provides more reliable operation of the PRHM.
IMPACT OF HIGH VOLTAGE ELECTRIC DISCHARGES ON THE CURED POLYMER COMPOSITE MATERIALS, MODIFIED IN A MICROWAVE ELECTROMAGNETIC FIELD
Authors: Zlobina I. V. , Korotich A. A.
Published: January 2021

Due to the widespread use of carbon fiber-reinforced polymer composite materials (PCM) in the structural elements of aircraft with a distributed surface layer of lightning-proof coating (MFP) in the form of metal grids to reduce the risk of lightning strikes and the possibility of increasing their strength characteristics by processing in the microwave electromagnetic field, the need to study the impact of this method of processing on the resistance of PCM to high voltage electrical discharges. The studies of the impact of the discharge voltage 180…200 kV on samples of PCM with the minimum wage and no minimum wage. It is established that pretreatment of samples of the cured polymer composite MW in a microwave electromagnetic field energy flux density (17…18)104 µw/cm2 does not degrade their molniezaschita characteristics and contributes to reducing the size of the damaged area up to 1.5 times. Samples processed in the microwave electromagnetic field without MSP do not have delaminations and burns in contrast to the control ones. The obtained results indicate the possibility of strengthening treatment in the microwave electromagnetic field of structural elements of carbon fiber distributed in the surface layer of the MSP in the form of a metal grid.
MODELING OF THE GRINDING PROCESS BY MICRO-CUTTING SINGLE ABRASIVE GRAINS. PART 1. DETERMINATION OF THE STRENGTH OF ABRASIVE GRAINS
Authors: Zubarev Yu. M. , Priemyshev A. V.
Published: January 2021

Main performance indicators of grinding wheels are the strength and wear resistance of abrasive grains. The description of the installation for studying the process of micro-cutting of various materials with single abrasive grains, which allows you to approximate the working conditions of a single abrasive grain to the conditions of real grinding in a wide range of cutting speeds. The effect of the cutting speed on the maximum cut thickness maintained by the grain vertexes without their destruction is shown. The influence of physical and mechanical properties of the workpiece material and the abrasive tool material, together with technological factors, on the micro-cutting process is considered.
PHILOSOPHY OF TRAINING ENGINEERS FOR A NEW TECHNOLOGICAL ORDER AT THE DEPARTMENT SM-12, BAUMAN MOSCOW STATE TECHNICAL UNIVERSITY
Authors: Galinovsky A. L.
Published: January 2021

The article examines the problem of personnel training in modern conditions. The task is set about the competencies of students of a technical university, what educational technologies are effective for training personnel, how to form the topic of scientific work for students. The article concludes that scientific and research work for the educational process is an important discipline, the importance of this discipline is very high. The article notes the role of the discipline “Introduction to the specialty” and its importance for further education at the university. All these questions are asked at a time when the world is entering a new industrial revolution.
ANALYSIS OF THE RISK MANAGEMENT PROCESS IN THE QUALITY MANAGEMENT SYSTEM OF AN ENTERPRISE MANUFACTURING MEDICAL DEVICES
Authors: Lartseva T. A. , Aleksashina O. V. , Pak E. V. , Grinyuk O. N.
Published: January 2021

In modern market conditions, any organization, including those engaged in the production of medical devices, must identify risks, carry out their analysis, and determine the degree of their influence on the achievement of goals. This forces enterprises, on the basis of standards for management systems, standards for risk management, including taking into account the specifics of organizations, to implement a risk-based approach, creating their own risk management mechanisms. The article presents and describes in detail the basis for the methodology of the risk management process scheme in the quality management system of an organization engaged in the field of medicine.
PUNCHING CUPS WITH BOTTOM FLANGE BY DIRECT EXTRUSION WITH COUNTER-PUNCH. ACTUALITY AND STATEMENT OF PROBLEM
Authors: Vorontsov A. L. , Nikiforov I. A.
Published: January 2021

The actuality of the study is justified in order to determine the main technological parameters of direct extrusion using the counter-punch necessary for the successful design of the process of punching cups with a flange in the bottom. The solvable mechanical and mathematical problem is formulated and complete system of the necessary initial equations is given.
PUNCHING CUPS WITH BOTTOM FLANGE BY DIRECT EXTRUSION WITH COUNTER-PUNCH. DETERMINATION OF KINEMATIC AND STRESS STATES IN THE FIRST PERIPHERAL REGION OF PLASTIC DEFORMATION
Authors: Vorontsov A. L. , Nikiforov I. A.
Published: January 2021

Formulas are obtained that relate the current geometric parameters of the extruded blank to the size of the stroke of the punch. Using the theory of plastic flow by the method of A. L. Vorontsov, the formulas are obtained that are necessary for calculating the stresses and force parameters of the extrusion process with the counter-punch of the peripheral region adjacent to the formed wall of the product.
RESEARCH OF RELIABILITY AT THE DESIGN STAGE OF COMPLEX TECHNICAL SYSTEMS
Authors: Trukhanov V. M. , Basova S. S. , Trukhanov G. V. , Kuprovskiy G. I.
Published: January 2021

The issues of nomenclature choice of reliability indices and methods of reliability distribution between components of product have been considered in the present article. Calculation methods of design reliability of expensive nondiscarding objects like movable mountings and also mathematical models of design reliability, which taking into account random and nonrandom failures. The technique of calculation and achievement of required level reliability has been represented.
THE TRACTION MECHANICS OF A BULLDOZER WITH PNEUMATIC PROPULSION SCHEME 44 AND BLOCKED ACTUATOR IN THE DEVELOPMENT OF SOIL
Authors: Buzin Yu. M. , Tyunin V. L.
Published: January 2021

The task of the work is to assess the traction capabilities of a wheeled bulldozer when digging the soil in connection with the specifics of its pneumatic-wheeled propulsion and drive of the driving wheels, since publications on this topic are not complete enough. And for this it is necessary, first of all, to further highlight some issues of traction mechanics of these machines, using the material developed by the authors. Due to the complexity of solving all the problems of traction mechanics of a wheeled bulldozer purely analytical way in the work applied analytical-graphical method, which allowed some traction indicators to Express through others, using their graphical dependencies, built on analytical formulas through the General third indicators, by their further exclusion. The object of research is a bulldozer having a pneumatic wheel drive with a wheel scheme 44 and a blocked drive them. The process of functioning of the bulldozer is considered. Traction mechanics of the bulldozer including questions of statics, kinematics, dynamics and management of process of development of soil taking into account specifics of work of its pneumocycle mover is investigated.
CHECKING THE QUALITY CHARACTERISTIC DISTRIBUTION FORM BY NON-PARAMETRIC CRITERIA AGREEMENT IN MATLAB
Authors: Borbatc N. M. , Shkolina T. V.
Published: January 2021

To check the agreement of the empirical distribution with the theoretical one, especially with a relatively small sample size, the socalled nonparametric criteria of agreement are often applied. The rules for the correct application of nonparametric criteria for consent, especially when the parameters of the proposed distribution are not known and are estimated from sample data, are given in recommendations R 50.1.037–2002. In order to facilitate the practical application of the provisions of these recommendations, the authors developed a procedure in MATLAB, full the listing of which is given in the appendix. As a result of applying the procedure, the values of the statistics of the criteria, the corresponding values of the attainable level of significance, as well as the graphs of the empirical and theoretical distribution functions that allow visually assessing the degree of discrepancy between them are displayed. For a number of theoretical distributions, it is possible to use the corresponding MATLAB builtin functions.
PUNCHING CUPS WITH BOTTOM FLANGE BY DIRECT EXTRUSION WITH COUNTER-PUNCH. DETERMINATION OF THE DEFORMED STATE IN THE THIRD CENTRAL REGION OF PLASTIC DEFORMATION
Authors: Vorontsov A. L. , Nikiforov I. A.
Published: January 2021

The formulas necessary for calculating the accumulated deformations obtained during extrusion with a counter-punch of the central region adjacent to the formed wall of the product are obtained. To derive the formulas, we used the general method of plastic flow of A. L. Vorontsov. The obtained formulas allow us to determine the deformed state of the workpiece at any point in this area. Further, these formulas will be used to take into account the hardening of the extruded material.
PUNCHING CUPS WITH BOTTOM FLANGE BY DIRECT EXTRUSION WITH COUNTER-PUNCH. DETERMINATION OF THE DEFORMED STATE DURING CONSTRAINED EXTRUSION IN THE THIRD CENTRAL REGION PLASTIC DEFORMATION
Authors: Vorontsov A. L. , Nikiforov I. A.
Published: January 2021

The formulas necessary for calculating the accumulated deformations obtained in the process of constrained extrusion of the central region based on the inner part of the formed wall of the product are obtained. To derive the formulas, the general method of plastic flow A. L. Vorontsova. The obtained formulas allow us to determine the deformed state of the workpiece at any point in this area. Further, these formulas will be used to take into account the strengthening of the extruded material.
PUNCHING CUPS WITH BOTTOM FLANGE BY DIRECT EXTRUSION WITH COUNTER-PUNCH. METHODOLOGY FOR CALCULATING TECHNOLOGICAL PARAMETERS FREE EXTRUSION PROCESS
Authors: Vorontsov A. L. , Nikiforov I. A.
Published: January 2021

The methodology for calculating the energy and deformation parameters of the processes of free extrusion of glasses with a counter-punch is described. Extrusion of both non-hardening and hardening material is considered. In the latter case, accounting for the hardening of the extruded material is described in detail. The above formulas allow us to determine such important parameters of the stamping process as the total and specific deforming forces, maximum pressure on the matrix wall, and increase in yield stress.
PUNCHING CUPS WITH BOTTOM FLANGE BY DIRECT EXTRUSION WITH COUNTER-PUNCH. METHODOLOGY FOR CALCULATING TECHNOLOGICAL PARAMETERS CRAMPED EXTRUSION PROCESS
Authors: Vorontsov A. L. , Nikiforov I. A.
Published: January 2021

The method of calculating the energy and deformation parameters of the process of constrained extrusion of glasses with a counter-punch is described. Extrusion of both non-hardening and hardening material is considered. In the latter case, accounting for the hardening of the extruded material is described in detail. The above formulas allow us to determine such important parameters of the stamping process as the total and specific deforming forces, maximum pressure on the matrix wall, and increase in yield stress.
PUNCHING CUPS WITH BOTTOM FLANGE BY DIRECT EXTRUSION WITH COUNTER-PUNCH. INITIAL EXPERIMENTAL VERIFICATION OF THEORETICAL RESULTS
Authors: Vorontsov A. L. , Nikiforov I. A.
Published: January 2021

The goals of experimental verification of theoretical results are formulated. The results of an experimental verification of the obtained theoretical formulas are presented, which make it possible to determine the most important parameters for extruding glasses with a counter-punch. The characteristics of the tools used, the geometric parameters of the extrusion experiments, the strength characteristics of deformable materials, and their lubrication are described in detail. Studies of extrusion of non-hardening material simulating hot deformation are carried out. The high accuracy of the obtained calculation formulas is confirmed.
ANALYSIS OF THE SPEED OF THE DEFUZZIFIER IN THE TASK OF CONTROLLING THE ROBOT-MANIPULATOR
Authors: Bobyr M. V. , Milostnaya N. A. , Arkhipov A. E. , Luneva M. Yu.
Published: January 2021

Linear, nonlinear, modified, high-speed defuzzifiers based on the area ratio method are presented in this paper. The proposed defuzzifiers are used in a fuzzy digital filter device and make it possible to ensure the additivity of the robotic manipulator control system, since traditional models do not have this property. The essence of this development is to find a crisp value of the output fuzzy variable, which in this case are the regulation coefficients of the fuzzy digital filter. Reducing the number of computational operations provides an increase in the performance of the defuzzifier. The reduction in number of computational operations is carried out by eliminating the output variable’s truncated term’s height calculation, thereby reducing the computation time. A simulation model which was implemented in the MatLab Simulink system, for a neuro-fuzzy device of the robotic arm using linear and non-linear defuzzifiers is presented. The dependence of time graphs on the angle of rotation of the joints of the robotic manipulator are compared, based on the traditional center of gravity method and the method shown in this paper. It was found that the traditional center of gravity method does not ensure the fulfillment of the specified rotation angles of the links of the robotic arm, while the proposed models of defuzzifiers have this property, which can be seen from the presented dependency graphs. The simulation model of the device was also designed as a parallel-conveyor device for implementation in the field-programmable gate array of the Xilinx Spartan 3Е family. The analysis showed that the calculation time for a crisp value with high-speed defuzzification is 130 ns, which is two orders of magnitude higher than existing models. The experiment was conducted at a frequency of 100 MHz.
COLLEGIAL METAGRAMMATICS FOR MODELING DYNAMICALLY CHANGING PROGRAMS FOR CREATING INFORMATION SECURITY SYSTEMS
Authors: Atakishchev O. I. , Gribunin V. G. , Borisenkov I. L. , Smirnov Ya. D.
Published: January 2021

The article suggests using a new class of metagrammatics – collegial metagrammatics – to solve the problem of forming programs for creating information security systems in the conditions of their dynamic adjustment. A variant of the classification collegial metagrammatics is presented, and the features of their main classes are considered in relation to solving the problem of creating information security systems. For the practical use of collegial metagrammatics in solving the problem under consideration and conducting experimental research, the development of a specialized software comlex KMG_NET was carried out. The study of the dependence the number production rules and the complexity of the used Chomsky grammars in the implementation of models promising programs for creating systems and tools for ensuring information security based on collegial metagrammatics and conventional grammars was carried out. For the practical use of collegial metagrammatics in solving the problem under consideration and conducting experimental research, the development of a specialized software complex KMG_NET was carried out. KMP_NET is an interactive environment whose main data element is graphs, formal grammars, and KMG. This allows you to solve a representative set of scientific and applied problems, such as building formal models of generated programs based on KMG, setting production rules for their dynamic change, developing convenient interfaces for entering and analyzing source data and parsing procedures for the considered application area. The study of the dependence the number production rules and the complexity of the Used Chomsky grammars in the implementation of models promising programs for creating systems and tools for ensuring information security based on collegial metagrammatics and conventional grammars.
FINDING MEASURES OF DEVIANT ACTIVITY OF FINANCIAL MONITORING ENTITIES AND THE PRACTICE OF ITʼS APPLICATION
Authors: Beketnova Yu. M.
Published: January 2021

The solution of the State tasks to combat the laundering of proceeds from crime involves the processing of large amounts of heterogeneous data. The volume increasing of incoming information (approximately 20 % annually) leads to a decrease in the efficiency of its processing. Decision makers are forced to work with subjective assessments and face significantly increased timelines for obtaining results. An analysis of the Rosfinmonitoring tasks of money laundering combat has shown that the actual need for the number of objects to be analyzed is many times greater than the capabilities of analysts. This problematic situation requires the objects for analysis prioritization. The heterogeneous nature of information resources and their significant volume exclude the possibility of their manual processing. The solution to the problem of primary identification of financial transactions schemes can be found through visualization of assessments of identified entities. To visualize information about financial monitoring objects, it is necessary to rank them. However, the objects of financial monitoring – business entities, credit organizations, professional participants in the securities market – are described by sets of characteristics, i.e. essentially are objects of vector nature. In mathematics, the ordinal relations for vectors, as it’s known, are not defined. The article presents the results of the problem solving in finding integrated estimates of financial monitoring objects. The resulting measures of the deviant activity of business entities, credit organizations and professional participants in the securities market served as the basis for the scientific visualization of financial monitoring data. The proposed solution has significantly improved the efficiency of identifying schemes with the participation of business entities involved in illegal activities.
ABOUT OPTIMAL MANAGEMENT OF WORK-STEALING DEQUES IN TWO-LEVEL MEMORY
Authors: Lazutina A. A. , Sokolov A. V.
Published: January 2021

In the parallel work-stealing load balancers, each core owns a personal buffer of tasks called deque. One end of the deque is used by its owner to add and retrieve tasks, while the second end is used by other cores to steal tasks. Our experience in software implementations has shown that it is important to optimize work with cache memory in parallel work-stealing load balancers. For example, by modifying deques so that they can hold task objects instead of pointers, we managed to increase the performance more than 2.5 times on the CPU-bound applications and decrease last-level cache misses up to 30 % compared to Intel TBB (Threading Building Blocks) and Intel / MIT (Massachusetts Institute of Technology) Cilk work-stealing schedulers. Therefore, it is important to investigate special methods of working with deques in two-level memory, and not just try to optimize the use of universal cache implementations. The paper analyzes the problem of optimal control of a work-stealing deque in two-level memory (for example, registers – random access memory), where probabilities of parallel operations with the deque are known. The classic sequential cyclic method for representing a deque in memory is considered. If a deque overflows or empty, we transfer elements from its middle part from the fast memory to the slow memory, since data from the end parts of the deque may be needed earlier. The problem is to find the optimal number of elements from both sides of the deque to leave in the fast memory if the deque is full or empty. The average time to get into the states when it is necessary to reallocate the memory is maximized.The simulation model and the mathematical model in the form of an absorbing Markov chain were constructed. The results of numerical experiments are presented.
METRIC APPROACH TO SEMANTIC-MORPHOLOGICAL IMAGE COMPARISON
Authors: Vizilter Yu. V. , Vygolov O. V. , Zheltov S. Yu. , Kniaz V. V.
Published: January 2021

In this paper we propose and consider different metric approaches to image comparison based on Morpho-Semantic (MS) and Semantic-Morphological (SM) models. The first proposed class-based approach presumes the embedding of MS and SM models to the metric space with weighted Lp metrics. This approach is based on representation of SM models as mosaic vector functions composed of semantic-morphological class expression maps. The feature description of these maps provides a global feature description of SM models by SM vectors. The second proposed class-based approach is based on resource models, which include semantic-morphological class expression maps with area recourse values. This approach implements the embedding of these mosaic class expression maps with area recourse values to the metric space with Earth Mover’s Distance (EMD) based on resource transportation between these maps. Finally, we propose the object-based approach to metric embedding of SM models inspired by Geometrical Difference Distance (GDD), which performs the comparison of mosaic image shapes via weighted pairwise comparison of their region shapes. In this way we obtain the SM Difference Distance (SMDD) and its EMD-version (SMDD). The practical applicability of proposed SM-metrics is largely determined by the strategy of feature set forming and parameter estimation scheme. The SM-metrics parameter tuning for comparison of some visual scenes/objects could be performed both as MS-modeling (interpretation) of human subjective reasoning and as MS-modeling (interpretation) of deep learning results. In both cases, SM models and SM metrics fitting could allow: making partially transparent the human or DNN reasoning in scene comparison tasks; Comparing (grouping, clustering) different experts (algorithms) in terms of different parameters settings for SM-models; performing the personalized post-training of neural network models with taking into account the individual SM-settings of concrete users, operators or experts. This will combine the effectiveness of deep learning on huge training bases with partial transparency of reasoning and the possibility of directly taking into account the wishes of users in terms of SM-models, rather than by creating the artificial training bases via artificial augmentation.
ALGORITHM OF SKELETON-BASED STATIC HAND GESTURE RECOGNITION
Authors: Kalina D. A. , Golovanov R. V. , Vorotnev D. V.
Published: January 2021

We present the monocamera approach of static hand gestures recognition based on skeletonization. The problem of creating skeleton of the human’s hand, as well as body, became solvable a few years ago after inventing so called convolutional pose machines – the novel architecture of artificial neural network. Our solution uses such kind of pretrained convolutional artificial network for extracting hand joints keypoints with further skeleton reconstruction. In this work we also propose special skeleton descriptor with proving its stability and distinguishability in terms of classification. We considered a few widespread machine learning algorithms to build and verify different classifiers. The quality of the classifier’s recognition is estimated using the wellknown Accuracy metric, which identified that classical SVM (Support Vector Machines) with radial basis kernel gives the best results. The testing of the whole system was conducted using public databases containing about 3000 of test images for more than 10 types of gestures. The results of a comparative analysis of the proposed system with existing approaches are demonstrated. It is shown that our gesture recognition system provides better quality in comparison with existing solutions. The performance of the proposed system was estimated for two configurations of standard personal computer: with CPU (Central Processing Unit) only and with GPU (Graphics Processing Unit) in addition where the latest one provides realtime processing with up to 60 frames per second. Thus we demonstrate that the proposed approach can find an application in the practice.
DYNAMIC CONTROL METHODS OF CACHE LINES REPLACEMENT POLICY
Authors: Vishnekov A. V. , Ivanova E. M.
Published: January 2021

The paper investigates the issues of increasing the performance of computing systems by improving the efficiency of cache memory, analyzes the efficiency indicators of replacement algorithms. We show the necessity of creation of automated or automatic means for cache memory tuning in the current conditions of program code execution, namely a dynamic cache replacement algorithms control by replacement of the current replacement algorithm by more effective one in current computation conditions. Methods development for caching policy control based on the program type definition: cyclic, sequential, locally-point, mixed. We suggest the procedure for selecting an effective replacement algorithm by support decision-making methods based on the current statistics of caching parameters. The paper gives the analysis of existing cache replacement algorithms. We propose a decision-making procedure for selecting an effective cache replacement algorithm based on the methods of ranking alternatives, preferences and hierarchy analysis. The critical number of cache hits, the average time of data query execution, the average cache latency are selected as indicators of initiation for the swapping procedure for the current replacement algorithm. The main advantage of the proposed approach is its universality. This approach assumes an adaptive decision-making procedure for the effective replacement algorithm selecting. The procedure allows the criteria variability for evaluating the replacement algorithms, its’ efficiency, and their preference for different types of program code. The dynamic swapping of the replacement algorithm with a more efficient one during the program execution improves the performance of the computer system.
DESIGN OF INTEGRATED MOBILE APPLICATION SYSTEM IN CORPORATE ENVIRONMENT
Authors: Titarev D. V. , Borzykin E. A. , Romanov A. S. , Lapkovskaya E. I.
Published: January 2021

The benefits of the BYOD (Bring Your Oun Device) approach is describes. This approach contributes to greater efficiency of business processes and economy of the enterprise budget. The necessity of focusing on the problem of information security is substantiated. As a solution, a mobile application is proposed that allows to identify the user and distribute security policies to the device. The following describes the problems that arise in the process of solution – problems of transferring data from a mobile device to the storage, the problem of centralized storage of incoming data, assignment of geolocations available for working with the application, and a problem of cross-platform. Further, the task is formulated – to design and develop a universal solution to these problems, since there is no single, universally accessible solution that would satisfy all the described requirements. The next part of the article describes the model of the proposed system, gives its general description in a formalized and graphical form. The article also provides an image and description of the system architecture, consisting of three main parts: IOS client, Android client and server. The advantages of the developed client-server architecture are highlighted: security and centralized access to data. The architecture of each individual part is described with a specification and justification for the choice of libraries and technologies used. The following describes the operation of the system, presents a sequence diagram of the client requests during authorization and receiving a set of policies for a new user, and BPMN diagram of the business process for obtaining Android agent data. Thus, the resulting solution will reduce the cost of administration of mobile devices in a corporate environment.
KEYBOARD HANDWRITING ANALYSIS IN THE LEARNING SYSTEMS
Authors: Ivanova S. M. , Ilyichenkova Z. V. , Antonova A. A.
Published: January 2021

The confirming the identity of a user working distance educational technologies problem is considered in the article. Now distance educational technologies don’t give confidence that the student works in the educational environment independently, without involving third parties in the process. In the learning process, there is a substitution of one user for another when learning or performing certification work. To eliminate the unauthorized replacement of the student, it is proposed to use his keyboard handwriting not only when authorizing the user in the system, but also in the process of his work. When working in an educational environment, a user can employ various keyboard characters when typing, so storing data based only on a passphrase is not enough. So, to ensure the correct operation of the handwriting, its characteristics are determined for the entire set of characters used, which will be involved in the certification process then. Depending on the characteristics found, based on the keystroke duration, the characters are combined into clusters according to the obtained mean and standard deviations. Combining occurs according to the principle of minimum distances between each pair of characters. Since the scales of these characteristics have a different numerical range, they are first converted to the range [0; 1]. This allows us to make their contribution to the formation of clusters equivalent. The obtained data can be employed during the entire time the user is in the educational environment to verify his identity. The experimental data used to form keyboard handwriting are presented in the paper. The process of cluster formation for a set of 8 characters is described in detail. For a complete set of letters, the initial data and the final result are given. Studies have shown the efficiency of the proposed method.
STRUCTURAL MODELING OF THE DATABASE AND KNOWLEDGE BASE ACTIVE ELEMENTS OF FLEXIBLE MANUFACTURING SYSTEMS
Authors: Rahimov Sh. R. , Huseynov A. H.
Published: January 2021

In this paper, using the PROLOG language and logical programming methods, development of databases and knowledge bases for manipulating objects like active elements in a simulation representation is considered. The knowledge presented in the form of facts and rules which are the main part of the PROLOG language, simplifies the creation of a knowledge base in logical terms. A source of information selected in accordance with the professional interests of an user and converted into a logical form is the main part for solving its tasks. Logical programming methods allow building knowledge base for manipulating objects. Information objects are built on the basis of a common database and serve as a source of information selected in accordance with the professional interests of the user and converted into a form suitable for solving its tasks. The architecture of structural modeling of each active element that is part of flexible manufacture systems is proposed. The production model is presented in view of facts and rules in the PROLOG language and also the knowledge base on the PROLOG language is implemented to manipulate active elements in the complex, as flexible manufacture systems. As a result, databases and knowledge bases are obtained that ensure the dynamic behavior of an object owing to time. The advantage of structural modeling of the system is that knowledge about the modelling system is defined and the algorithm implemented on the computer finds a solution that matches this goal.
METAGRAMMATICAL MODEL AND METHOD OF DECODING THE VIDEOGRAPHICAL INFORMATION WITH PREFIX COMPRESSION CODES
Authors: Adjemov S. S. , Kostogryzov A. I. , Atakishchev A. O.
Published: January 2021

In the article, a metagrammatic model and the local-frequency decoding method are proposed to solve the problem of decoding videographic information with prefix compression codes. The metagrammatic model is presented as a five – level stochastic metagrammatics that allows us to take into account the structural and statistical features of prefix coded data and use them to improve the decoding efficiency. It is shown that only regular Chomsky grammars can be used in the proposed stochastic metagrammatics. The model uses a combined metagrammatics scheme with matching rules such as “terminal – initial symbol” (TS) and “terminal – product label” (TP). It is shown that structuring the model in the form of stochastic metagrammatics can significantly reduce the total number of products in metagrammatics and simplify its modification when solving problems of decoding promising prefix compression codes. The features of the local-frequency method of decoding videographic information with prefix compression codes focused on this metagrammatic model are considered. To implement one of the main and time-consuming procedures of this method, related to the search in local code tables and translation of uneven prefix codes, a local-private procedure for searching code words is proposed. The features of the software implementation of the proposed method are considered. The results of experimental testing of the method on the example of real arrays of non-uniform prefix codes are presented.
POSSIBILITY OF USING ELEMENTS OF MATHEMATICAL LIBRARY FOR A PARALLEL LANGUAGE IN CONSTRUCTION MATRIX PROGRAMS
Authors: Romanova D. S. , Smogluk S. Yu.
Published: January 2021

Today, due to problems in improving computing performance, parallel programming continues to evolve. There are many different languages in which you can write parallel programs. One of them is the functional-threading parallel programming language Pifagor, which in turn is very specific and allows you to write a program with maximum parallelism, as well as it is designed to solve the portability problem of parallel programs. Tools and a library of functions continue to be developed for this language. This study is devoted to the development of elements of the mathematical library and the search for the most effective mathematical parallel algorithms. The following methods are considered and used in the work: sequential, recursive (left and right recursion), factorization, and pairwise comparisons. As a result of the study, a number of mathematical functions were developed, and a study was made of the possibility of using these functions in the development of programs for multiplying large-dimensional matrices. The work demonstrates the effectiveness of using the developed simple functions implemented by different methods in matrix multiplication programs. The prospects of further work in this direction are noted, having in mind the analysis of the possibility of using artificial intelligence methods to increase efficiency and facilitate the development of parallel programs with large-sized matrices.
EFFECTIVE DYNAMIC PROGRAMMING ALGORITHMS
Authors: Karpov D. A. , Struchenkov V. I.
Published: January 2021

This article is devoted to the analysis of the possibilities of increasing the speed of dynamic programming algorithms in solving applied problems of large dimension. Dynamic programming is considered rather than as an optimization method, but as a methodology that allows developing, from a single theoretical point of view, algorithms for solving problems that can be formalized in the form of multi-stage (multi-step) processes in which similar tasks are solved at all steps. It is shown that traditional dynamic programming algorithms based on preliminary setting of a regular grid of states are ineffective, especially if the parameters defining the states are not integer. The problems are considered, in the solution of which it is advisable to build a set of states in the process of counting, moving from one stage to another. Additional conditions are formulated that must be satisfied by the problem so that deliberately hopeless states do not fall into sets of states at each step. This ensures the rejection of not only the paths leading to each of the states, as in traditional dynamic programming algorithms, but also the unpromising states themselves, which greatly increases the efficiency of dynamic programming. Examples of applied problems are given, for the solution of which traditional dynamic programming algorithms were previously proposed, but which can be more efficiently solved by the proposed algorithm with state rejection. As applied to two-parameter problems, the concrete examples demonstrate the effectiveness of the algorithm with rejecting states in comparison with traditional algorithms, especially with increasing the dimension of the problem. An applied problem is considered, in the solution of which dynamic programming is used to construct recurrent formulas for calculating the optimal solution without enumerating options at all.
TOOLKIT FOR IMMERSIVE VIRTUAL SIMULATORS WITH BIOFEEDBACK
Authors: Gribova V. V. , Strekalev V. O.
Published: January 2021

The architecture of the instrumental complex for the creation and reproduction of immersive virtual simulators using biological feedback is proposed. An overview of existing solutions such as tools for the development and reproduction of virtual simulators is considered. The analysis of the use of virtual reality in different areas such as aircraft control, parachute jumping, various medical procedures, and operations which require preliminary preparation is considered. The concept of an immersive virtual simulator with biological feedback has been introduced. The use of virtual reality and biological feedback equipment as well as the applicability of the software-hardware complex in the field of interaction and control of objects of the virtual environment based on the state of a person and the state of objects are determined within its framework. The following principles of the instrumental complex development based on the use of the ontological approach are proposed: the use of various mechanisms to describe the learning scenario, the support for various control mechanisms of the simulator, the inclusion of specialists of different profiles in the development process of the simulator, and the automatic generation of the components of the virtual environment based on the declarative model of the virtual simulator to simplify the creation of a virtual environment. The description of the architecture and all interested participants is provided. The connections between the participants and the components of the tool complex are shown. The information and software components of the instrumental complex aimed at automating the process of creation, launch, control, and monitoring based on biological feedback are considered. A complex of ontologies is described: the ontology of an immersive virtual simulator with biological feedback and the ontology of knowledge about human states. The interfaces of the instrumental complex are demonstrated, such as interfaces of the equipment editor, monitoring tools, and launching tools.
VIRTUALIZATION OF THE NETWORK INFRASTRUCTURE OF BELARUSIAN STATE UNIVERSITY
Authors: Kochyn V. P. , Zherelo A. V.
Published: January 2021

The article discusses current issues of virtualization of the network infrastructure of educational institutions. A new approach to creating a cloud virtualization environment for the network infrastructure of educational institution has been proposed. It is based on the joint use of virtualization technologies and software-defined networks. Virtual network infrastructure is a combination of technologies and architectural solutions. It provides users with mobility during an ongoing educational process, secures access to cloud information resources of the wireless virtual network of an educational institution and centralized Internet access control. A prototype of the virtual network infrastructure of the Belarusian State University has been built. The prototype implements a model that includes virtual network segments (subnets), with which services are provided to end users, and virtual segments that provide presentation of service functions. Virtualization technologies and software-defined networks allow to unify the process of creating network infrastructure, to scale the resources provided on demand with minimal organizational and technical costs, and to adapt the virtual infrastructure to the requirements of a particular educational institution. The proposed model using virtual network segments has been implemented in the data processing center of the Belarusian State University. To create a cloud environment, the solution based on OpenStack was chosen. The basis of the virtualization environment is cloud services, which provide the implementation of the functionality of a virtual network infrastructure.
THE METHOD FOR VISUALIZING SEMISTRUCTURED INFORMATION OF LARGE PRODUCTION SYSTEMS
Authors: Polishuk Yu. V.
Published: January 2021

The process of operating large production systems is associated with the need to generate management decisions based on the analysis of the state of the system, represented by semistructured information. By semistructured information, within the framework of this work, we mean information in which a certain structure can be distinguished, however, this structure in advance is completely or partially unknown, or may change over time. The factographic data necessary for the generating of management decisions are represented by semistructured information located in various information resources such as electronic documents, databases, SCADA systems, etc. Thus, for the visualization of factual data in the processes of organizing the management of large production systems, the urgent tasks are: the implementation of incoming control for an array of factual data, their structuredness, implemented by means of a model, the possibility of their transformation, including convolution and aggregation, as well as various visualizations the same data on the according to requirements of a group of decision-makers. All of the above can be successfully implemented through the use of XML technologies, and SVG, which is a scalable vector graphics markup language, is suitable as a format for the resulting visualization. This format is intended for description of two-dimensional vector and mixed vector-raster graphics in XML format. A detailed description of the process of visualization of semistructured content, including four main stages, is considered, and a practical example of automated visualization of semistructured information of structural schemes of an APCS for a gas condensate field is given. As part of the work, the effectiveness of the proposed method for visualizing semistructured information was evaluated, which confirmed its effectiveness in the conditions of large production systems, when the number of uniform visualized structural elements can reach tens or more. The method of visualizing the semistructured content of large production systems makes it possible to automatically obtain its visual representation, which makes it possible to analyze expert information in the form of its graphical representation. The latter makes it possible to increase the speed of perception of factual data by 40…45 % and to minimize the time for updating the visualization when the factual data at the control object changes.
ANALYSIS OF HIERARCHICAL LEARNING WITH REINFORCEMENT FOR THE IMPLEMENTATION OF BEHAVIORAL STRATEGIES OF INTELLIGENT AGENTS
Authors: Dubenko Yu. V. , Dyshkant Ye. Ye. , Gura D. A.
Published: January 2021

The paper discusses the task of evaluating the possibility of using robotic systems (intelligent agents) as a way to solve a problem of monitoring complex infrastructure objects, such as buildings, structures, bridges, roads and other transport infrastructure objects. Methods and algorithms for implementing behavioral strategies of robots, in particular, search algorithms based on decision trees, are examined. The emphasis is placed on the importance of forming the ability of robots to self-learn through reinforcement learning associated with modeling the behavior of living creatures when interacting with unknown elements of the environment. The Q-learning method is considered as one of the types of reinforcement learning that introduces the concept of action value, as well as the approach of “hierarchical reinforcement learning” and its varieties “Options Framework”, “Feudal”, “MaxQ”. The problems of determining such parameters as the value and reward function of agents (mobile robots), as well as the mandatory presence of a subsystem of technical vision, are identified in the segmentation of macro actions. Thus, the implementation of the task of segmentation of macro-actions requires improving the methodological base by applying intelligent algorithms and methods, including deep clustering methods. Improving the effectiveness of hierarchical training with reinforcement when mobile robots operate in conditions of lack of information about the monitoring object is possible by transmitting visual information in a variety of states, which will also increase the portability of experience between them in the future when performing tasks on various objects.
AUTONOMOUS CORRECTION OF A SINGLE-CHANNEL INERTIAL CONTROL SYSTEM
Authors: Kikin I. S.
Published: January 2021

The problem of algorithmic design of the system of inertial control of a moving object is considered, in which the compensation of number errors caused by errors of accelerometers without external sources of information about the navigation elements of the object is carried out. The principle of solving the problem is demonstrated on the model of a single-channel positional inertial control system. Algorithms of instantaneous a posteriori estimation of calculated variables are investigated, which allow to obtain estimates that are invariant to measurement errors, and to correct the inertial control channel without an external positioning system. For the operating conditions of the system, under which the values of measurement errors and the disturbing force are represented by random numbers that preserve constant values over the observation interval, estimates of the calculated variables corresponding to almost complete compensation of the calculation errors are obtained.