Работая с нашим сайтом, вы даете свое согласие на использование файлов cookie. Это необходимо для нормального функционирования сайта, показа целевой рекламы и анализа трафика. Статистика использования сайта отправляется в «Яндекс» и «Google»

Понятно

Научный журнал Моделирование, оптимизация и информационные технологииThe scientific journal Modeling, Optimization and Information Technology

Online media
issn 2310-6018

submit
a manuscript

metadata of articles for the last 2 years

Multidimensional cluster analysis of vessel traffic data for route planning

2024. T.12. № 2. id 1591

Grinyak V.M. Artemiev A.V. Devyatisilnyi A.S. Dudko D.O. Sazontova M.D.

DOI: 10.26102/2310-6018/2024.45.2.044

The work is devoted to the problem of planning ship routes in water areas with heavy traffic. In conditions of heavy traffic, navigational safety can be ensured only if ships adhere to a certain traffic pattern. The paper examines the problem of planning a route in such a way that it corresponds to the shipping practices that have developed in a particular area. The route planning method proposed in this work is based on clustering data on vessel traffic. The selected clusters represent areas in three- or four-dimensional phase space with similar speeds and courses of vessels, on the basis of which a graph of possible routes is formed. A feature of the approach for constructing a graph is the reduction in the number of vertices and edges by identifying the location of the selected clusters by covering polygons. The work shows that in many cases not only concave, but also convex polygons can be used, which can further reduce the power of the graph. The paper provides a metric for the distance between points in phase space, which is used to cluster data, and discusses the problem of choosing metric parameters and the clustering algorithm. The promise of using the DBSCAN algorithm is noted. The work is accompanied by calculations of planned vessel routes based on data from real water areas (Tsugaru Strait). The results of clustering traffic data, identifying the location of clusters by constructing enclosing polygons, and calculating the route of the vessel are presented. It is noted that the problem under consideration may be promising in the context of the future development of autonomous vessels navigation. In this case, the calculated route of the vessel will correspond to the movement of other vessels that were previously in the water area. This will reduce the likelihood of dangerous situations occurring when an autonomous vessel moves in the general traffic flow.

Keywords: navigation safety, vessel traffic control, traffic route establishment system, heavy traffic, route planning, clustering, graph algorithms

Modified ant algorithm for constructing a time-limited tourist route

2024. T.12. № 2. id 1590

Medvedeva O.A. Minakova A.Y.

DOI: 10.26102/2310-6018/2024.45.2.043

The article considers the task of building a tourist route with predetermined points of the beginning and end of the route. The objects are divided into two types. The first ones are mandatory, which should certainly be included in the resulting route. And the second ones are additional ones, which are not necessary to visit. The route is formed taking into account the priorities set for the objects by the tourist, based on his interests and preferences, while the total time of visiting the objects should not exceed the specified deadline for arrival at the end point of the route. To solve this problem, the article proposes an approach based on the construction of a route by known methods along the main objects and its further expansion using ant strategies. To this end, the concept of "satiety" of the ant and the probability of returning to the main route are introduced, so that it is possible to control the time reserve. At the end of the article, we present the results of a computational experiment aimed at assessing the influence of the ant algorithm parameters on the resulting route and developing recommendations for adjusting these parameters depending on the size of the problem. In addition, a comparative analysis of the routes obtained by the proposed algorithm and the exact branch-and-bound method for a given set of objects is carried out, based on the results of which a conclusion is drawn about the effectiveness of the proposed algorithm.

Keywords: tourist route, ant algorithm, priority, traveling salesman's task, probabilistic choice

Application of natural language dialogue in distance learning

2024. T.12. № 2. id 1589

Bratischenko V.V.

DOI: 10.26102/2310-6018/2024.45.2.042

The relevance of the study is due to the low level of use of dialogue in natural language in distance learning. The creation of such tools based on artificial intelligence will make the process of distance learning more accessible and attractive. The article proposes to build a dialogue based on standard questions for the content of the distance learning course. The answer is selected based on the similarity of the user's question to the standard. It is recommended to use the structural units of the distance learning course as a set of answers, and the corresponding headings as standard questions. The training dialogue data is remembered and used to expand the list of standard questions and train the system. To control learning, a measure of the similarity of the student’s answers to test questions and the correct answer options is used. To generate test questions, you can use distance learning dictionaries and test tasks. It is proposed to determine the measure of similarity of two texts using the cosine of the embeddings of the closest terms. Data from comparing texts using the proposed methodology confirm its ability to correctly assess the similarity of texts and justify its use for organizing dialogue in natural language in distance learning.

Keywords: distance learning, ranking chatbot, natural language dialogue, embedding, soft testing, sentence similarity measure

Using simultaneous multithreading in high-performance numerical algorithms

2024. T.12. № 2. id 1588

Buevich E.A.

DOI: 10.26102/2310-6018/2024.45.2.041

The technology of simultaneous multithreading is considered to be of little use in programs involved in intensive calculations, in particular when multiplying matrices - one of the main operations of machine learning. The purpose of this work is to determine the limits of applicability of this type of multithreading to high performance numerical code using the example of block matrix multiplication. The paper highlights a number of characteristics of matrix multiplication code and processor architecture that affect the efficiency of using simultaneous multithreading. A method is proposed for determining the presence of structural limitations of the processor when executing more than one thread and their quantitative estimation. The influence of the used synchronization primitive and its features in relation to simultaneous multithreading are considered. The existing algorithm for dividing matrices into blocks is considered, and it is proposed to change the size of blocks and loop parameters for better utilization of the computing modules of the processor core by two threads. A model has been created to evaluate the performance of executing identical code by two threads on one physical core. A criteria has been created to determine whether computationally intensive code can be optimized using this type of multithreading. It is shown that dividing calculations between logical threads using a common L1 cache is beneficial in at least one of the common processor architectures.

Keywords: simultaneous multithreading, matrix multiplication, computation intensive, microcore, BLAS, BLIS, synchronization, cache hierarchy, spinlock

Analysis of paid parking service data to create an effective pricing system (using the example of Vladivostok)

2024. T.12. № 2. id 1585

Eryomin I.R. Nikitin P.V.

DOI: 10.26102/2310-6018/2024.45.2.015

The problem of allocation and operation of parking spaces is an important part of research in the field of intelligent transportation. In recent years, due to the sharp increase in the number of cars, the problem of limited parking space resources has been expressed. Effective parking management requires analysis of huge amounts of data and modeling to optimize the use of parking spaces. The implementation and operation of smart paid parking space in Vladivostok creates an interesting application area for data mining and machine learning. The study uses a large-scale data set of historical parking transactions in Vladivostok, including vehicle type, time, location, session duration, and more, to create a data model that reflects the relationship between parking prices, demand, and revenue. The article describes the mechanism for creating a data model that includes all important aspects of the functioning of paid parking lots and factors affecting occupancy. Using this model will allow for machine learning, application of models and evaluation of the effectiveness of their application. The study also identifies key factors influencing parking demand, such as time of day, day of week, location, etc. The data model and insights gained from this research can be used by governments and property owners to optimize the use of paid parking and improve traffic management in smart cities. The approach presented in this article can be applied to other cities to create data-driven pricing systems that meet the specific needs and characteristics of each city.

Keywords: modeling, paid parking lots, data analysis, gaussian distribution, optimization

Developing elements of technology to port Integro geoinformation system to Linux based on the system approach

2024. T.12. № 2. id 1584

Shumikhin A.S.

DOI: 10.26102/2310-6018/2024.45.2.040

The article discusses choosing a technological approach to porting a Windows desktop application that utilizes a non-cross-platform user interface component library, and that implements a plugin architecture, to Linux. The approach described can be used in cases when flexibility and low overhead is preferred over a ready-made solution. The work has been done based on systems analysis. A collection of existing options and their elements is examined. The resulting solution consists in using model-driven software development to separate platform-specific components from cross-platform ones by means of well-defined programming interfaces. The suggested version of a technology by which source code is generated from a declarative description of an object-oriented interface model provides interoperability between objects, residing in different modules and separated by a compiler or a runtime library boundary. The XML technology stack is used to implement validation, code completion and transformation of model descriptions into C++ source code. Interfaces are represented by virtual method tables. Each method is a C-style function. A reference to an interface is a structure containing a pointer to a virtual method table, and a pointer to an object instance. For each interface there is a number of declarations and definition generated: a set of function declarations, a virtual method table declaration, an interface reference structure declaration, wrappers for interface references and implementation base classes in C++. The technology is successfully applied in the development of INTEGRO geographic information system.

Keywords: plug-in architecture, object-oriented programming, application binary interface, c++, INTEGRO

Building gender- and age-dependent models for assessing bio-age based on the functional data of the patient's body

2024. T.12. № 2. id 1583

Limanovskaya O.V. Gavrilov I.V. Meshchaninov V.N. Lisovenko A.S.

DOI: 10.26102/2310-6018/2024.45.2.012

Machine learning methods are widely used to build medical predictive models. At the same time, along with methods based on classical statistics, Bayesian methods are used, which are most effective for small sample sizes. In this paper, a number of models for predicting the patient's bio-age based on his functional data using both classical machine learning methods and the Bayesian approach are constructed. The data used were the results of clustering that we carried out earlier in a previous study on the material of medical organizations “Sverdlovsk Regional Clinical Psychoneurological Hospital for War Veterans” and “Institute of Medical Cell Technologies” for 1995–2022 in a volume of 6440 records, where 4 clusters were obtained, divided by gender and patient status (inpatient and outpatient). Based on the assumption that patients in outpatient status have the smallest difference in biological and calendar age, and therefore make less error in the accuracy of the model than patients in inpatient status, it was decided to build models only for patients in outpatient status. The work constructed a set of models for 2 clusters – a cluster of men in outpatient status (sample size 344 records) and a cluster of women in outpatient status (sample size 991 records). The analysis of the age distribution in each group showed a two-modal distribution with a boundary at a value of 40 years. Therefore, the groups were divided by age into two parts: up to 40 years and after. The lazypredict platform was used to select classical machine learning models. For each group, 4 methods were selected that gave the highest accuracy and models were built based on them, as well as ensembles of models - stacking and votinmg. The accuracy of the models based on the test data ranged from 4.1 to 6.3 years. In the Bayesian approach, a linear multifactorial regression model with a given a priori distribution of regression coefficients is constructed. The accuracy of the models ranged from 4.9 to 6.6 years.

Keywords: bayesian approach, random forest, ensembles of models, voiting, stacking, geroprophylactic effect, predicting the effectiveness of treatment, bio-growth

Using a social network service to support decision making in an organizational system

2024. T.12. № 3. id 1582

Kalach A.V. Smolentseva T.E. Akatiev Y.A.

DOI: 10.26102/2310-6018/2024.46.3.001

The article discusses the features of using social media as a tool for interaction between a user and the organizational system of higher education. Based on market analysis and target objectives, a conclusion is drawn about the relevance and accessibility of the tool. The analysis of the online platform market in Russia from the perspective of social media usage by users is presented. The basic requirements for implementing a social network as an interaction tool with the organizational system are formulated, and a conclusion is made about the need to avoid duplicating information transmission channels within the organizational system. Requirements for the use of a tool, namely a social network, have been determined, on the basis of which it has become possible to use a social network as the main channel of communication with the user to support decision-making in the organizational system. These changes are demonstrated within the framework of a typical version of the information architecture of an organization using the example of a higher education institution. The integration of a social networking service to support decision-making into the information architecture of the organization is shown. A conclusion is drawn about new possibilities for using a social networking service as a tool to support decision-making, as well as the positive impact of this study on the information architecture of the organization and the activities of employees.

Keywords: smart assistant, organizational system, social network service, information architecture, application layer, chatbot

Unknown parameters estimation for multilayer modular regression using the least absolute deviations method

2024. T.12. № 2. id 1581

Bazilevskiy M.P.

DOI: 10.26102/2310-6018/2024.45.2.039

The article is devoted to the development and possibility of using a new mathematical form of connection between the output variable and input factors in regression analysis. For this purpose, previously studied simpler modular linear regression models were used, in which one or more input factors are transformed once using the modulus operation. A symbiosis of linear regression and modular regression with a multiary operation module is proposed. On its basis, a multilayer modular regression is formulated, built on the “module within a module” principle, that is, each new layer uses a module from the value of the previous layer. The problem of estimating multilayer modular regression with a given number of layers using the least modulus method is reduced to a partial-Boolean linear programming problem. Using the proposed regressions, the problem of modeling timber reserves in the Irkutsk region was solved. In this case, single-layer, two-layer and three-layer modular regression were constructed. The new models turned out to be significantly better in quality than linear regression, and with an increase in the number of layers, a decrease in the sum of the residual modules was observed. In the three-layer model, all residuals turned out to be zero. The developed mathematical apparatus can be successfully used to solve many data analysis problem.

Keywords: regression analysis, multilayer modular regression, least absolute deviations method, partial-boolean linear programming problem, wood

Structural and mechatronic aspects of improving the pipeline cleaning pig for creating a heat-insulating layer of wax deposits

2024. T.12. № 2. id 1580

Khasanov I.I. Shakirov R.A.

DOI: 10.26102/2310-6018/2024.45.2.038

Over the last decades one of the key problems of operation of trunk oil pipelines is formation of wax desposits and their deposition on the inner wall of pipelines during pumping of highly paraffinic oil. This process is characteristic both for new fields located in Western Siberia and for fields at the III stage of development with a high degree of exploration and gradually decreasing oil production volume and quality. Paraffinisation of pipes is a negative factor both for oil transportation processes and subsequent diagnostics of main oil pipelines, reducing the reliability of the oil transportation system. Nowadays in practice the struggle against wax deposits is carried out in two directions: removal of formed deposits by means of in-pipe cleaning devices and prevention of their formation by means of application of appropriate inhibitors. According to the results of researches conducted by a number of scientists, including the authors of the article, the economic feasibility of the idea about the efficiency of using the formed wax deposits layer on the inner wall of the pipeline as an additional internal thermal insulation layer was considered and confirmed. At the moment, there is no device in industrial operation whose design allows the formation of a uniform layer of paraffin deposits.

Keywords: modeling, main oil pipeline, treatment device, asphalt resin-paraffin deposits, mechatronics, prototype, arduino, thermal insulation

The method of placing the base stations of the local positioning system in the work area with obstacles

2024. T.12. № 2. id 1579

Krizhanovsky M.N. Tikhonova O.V.

DOI: 10.26102/2310-6018/2024.45.2.037

This article discusses the existing methods of positioning the base stations of the local positioning system in the work area. The choice of the station placement method largely determines the final accuracy and economic feasibility of the entire designed system. A review of the scientific literature has shown that there is currently no universal method for placing base stations in the positioning work area. Existing solutions implement either one of the standard approaches of station placement on a grid, or embody a method of sorting through many combinations of placements. The method of placing stations on a grid is not adapted to the conditions of designing a positioning system in a complex-shaped work area divided internally by various partitions and massive objects, since it does not take into account the peculiarities of radio signal propagation. The method of sorting through various combinations of base station placement in most software implementations is reduced to minimizing the influence of a geometric factor (Geometric Dilution of Precision - GDOP) on the measurement error of distances to stations and also does not take into account the distortion of the navigation signal introduced when passing through various obstacles. Therefore, the development of a methodology for the placement of base stations of a local positioning system is an urgent problem and the article is devoted to its solution. According to the proposed methodology, the working area containing massive obstacles on its area is divided into convex free subdomains in accordance with a greedy algorithm, in which the base stations are arranged. As a result of the work on the article, the principles for the operation of the base station placement methodology are outlined and a universal algorithm for station placement in work areas with obstacles is proposed.

Keywords: local positioning system, dilution of Precision, geometric factor, greedy algorithm, DOP, trilateration

Computer simulation of the operation of a pipe hanger body of a tubing hanger

2024. T.12. № 2. id 1577

Евгений E.

DOI: 10.26102/2310-6018/2024.45.2.036

The tubing hanger is a structural element included in the subsea production system. The pipe hanger body is the basis of the tubing hanger structure and absorbs the downhole pressure and gravity of the screwed pipe string, whose strength and performance play a decisive role in ensuring the safety of the production process. Compromise of the structural integrity of the pipe hanger body structure can cause irreversible catastrophic consequences. Insufficiently developed engineering solutions for the design of the flow part of the pipe holder housing can lead to an increase in local hydraulic resistance, which contributes to an increase in energy costs for pumping the produced fluid using the gas lift method and, as a consequence, a decrease in the efficiency of the entire production pipeline line. In this regard, this article is aimed at identifying the degree of influence of the geometric parameters of the flow part of the pipe hanger body on the strength and hydraulic characteristics of the structure. The paper presents the results of computer modeling of the pipe hanger body under operating conditions using the finite element method, as well as the finite volume method using the Ansys calculation package. In finite element modeling of the stress-strain state of the pipe holder body, the problem was considered within the framework of an elastic formulation. Using the finite volume method, a single-phase gas flow was simulated with a pressure difference Δp = 1 MPa between the inlet and outlet of the flow channel, taking into account the k-ɛ turbulence model. Based on the modeling results, the strength and hydraulic parameters of the structure were determined. The results of calculations of equivalent stresses, as well as the coefficient of hydraulic resistance for various types of design of the flow part of the pipe holder body are presented. The materials of the article are of practical value for engineers involved in the design of elements of an underwater production system.

Keywords: subsea production system, pipe hanger body, stress-strain state, tubing hanger, underwater fountain fittings, hydraulic resistance coefficient

Intellectualization of management in organizational systems with a digital hub of performance results based on optimization modeling

2024. T.12. № 2. id 1575

Lvovich Y.E. Pupykin A.N.

DOI: 10.26102/2310-6018/2024.45.2.018

The article discusses an approach to the intelligent management in organizational systems aimed at ensuring the efficiency of interaction between producers and consumers of activity results using digital technologies and optimization modeling. In the conditions of active digitization of business, a class of organizational systems with a digital activity results hub is identified. It is shown that in organizing the interaction between producers and consumers, management is aimed not only at coordinating objects of trading operations but also at regulating objects of information flows in order to reduce costs for digital transfer. At the same time, two optimization tasks arise, related to different schemes of distribution of objects from information flows by producers and consumers. In the first case, the optimized variables are the distribution coefficients of the planned volume of flow entering the digital hub between producing objects, taking into account promotion options. The extreme requirement ensures the minimization of costs, and the marginal requirement is associated with the planned maximum and minimum level of income of objects from the exchange of information with consumers. The decision-making algorithm combines random selection of coefficient values on a given interval with subsequent adjustment using gradient search. A stopping rule for the iterative process is selected, upon fulfillment of which the optimal distribution of information flows between objects is determined. In the second case, an optimization model is constructed in which the optimization variables are the coefficients of distribution of the planned volume of information flow between producers, taking into account the categories of activity results registered by the digital hub.

Keywords: organizational system, digital hub, intellectualization, management, optimization modeling

Study of deep learning models in the task of recognizing technological operations as a sequence of hand movements

2024. T.12. № 2. id 1574

Shtekhin Sergei Evgenievich S.E. Stadnik A.V.

DOI: 10.26102/2310-6018/2024.45.2.035

In this paper, we consider methods for recognizing on video a specific class of technological manual labor operations, which are a sequence of movements of the hands and fingers. The technological operation in this work is considered as a sequence of new specific symbols of the sign language. The paper considers various methods of gesture recognition on video. In this paper, a two-step approach was investigated. At the first stage, the key points of the hands on each frame are recognized by using the open mediapipe library. At the second stage, a frame-by-frame sequence of keypoints transformed into text using a trained neural network of the transformer architecture. The main attention is paid to training a neural network model of the Transformer architecture based on the open American Sign Language (ASL) dataset for recognizing sign language sentences in video. The paper considers the applicability of approach and the trained model of ASL for recognizing technological operations of manual labor with fine-motor skills as a text sequence. The results obtained in this paper can be useful in the study of labor processes with fast movements and short time intervals in algorithms for recognizing technological operations of manual labor on video data.

Keywords: video analysis of hand movements, gesture recognition, action recognition, deep neural networks, transformer, technological operations

Stochastic load modeling in the residential sector

2024. T.12. № 2. id 1573

Borovskiy A.V. Yumenchuk A.A.

DOI: 10.26102/2310-6018/2024.45.2.034

The power demand on the electric grid varies depending on the time of day and the needs of consumers. Demand response is a change in the consumer load curve accompanied by a change of price, used primarily by suppliers to limit consumption peaks. Reducing the short-term mismatch between production and consumption helps to integrate renewable energy sources, various low-carbon technologies, battery storage of electricity and electric vehicles into the electric grid. One of the tools used to maintain a balance between electricity production and consumption is smart meters, which operating in asmart grid. Such devices are widespread in the United States and the European Union, in the residential sector too. At the moment, the introduction of smart grids in the residential sector is just beginning in the Russian Federation. The article considers a stochastic model of electricity consumption by household appliances, based on the convolution theory. The measurement of power consumption by the most common household appliances has been performed. Several examples of consumer profiling based on the obtained data are given.The barriers that arise during the implementation of smart grids in the Russian Federation are identified, as well as the reasons why the interest of electricity suppliers in smart grids is growing.

Keywords: stochastic models, demand forecasting, multi-stage load, smart grid, energy consumption graph

Numerical simulation of suppression of forced oscillations of ends of microdroplet aggregates in magnetic fluids at increase of interfacial tension

2024. T.12. № 2. id 1572

Romanenko M.G. Drozdova V.I. Shagrova G.V.

DOI: 10.26102/2310-6018/2024.45.2.033

The relevance of modeling forced oscillations of microdroplet aggregates included in magnetic fluids is associated with the problem of predicting the parameters of working bodies of new devices and to the creation of new magnetosensitive media with controllable properties. The scientific interest is due to the unique sensitivity of microdroplet aggregates to the magnetic field, high magnetic permeability (for liquid media) and low interfacial tension at the aggregate-environmental liquid interface, which makes it possible to obtain forced oscillations of large amplitude. The nature of oscillations depends on the frequency and strength of the external field, as well as on the parameters of the aggregates. The peculiarities of forced oscillations of microdroplet aggregates at large amplitude are poorly understood; in particular, it is of interest to develop a universal modeling method suitable for computational experiments in a wide range of interfacial tension changes and to investigate the possibility of oscillation suppression with increasing frequency, carried out in this work. The modeling of forced oscillations is based on the energy approach and the assumption that the shape of the aggregate elongated along the field can be represented by an ellipsoid of rotation and its magnetization by a linear dependence on the external magnetic field strength. This allowed for a computational experiment with a change in interfacial tension by an order of magnitude in the range from 2 ∙ 10-6 N/m to 2 ∙ 10-5 N/m and obtain satisfactory agreement with the data of full-scale experiments. As a result of computational experiment, it is found that an increase in interfacial tension leads to a decrease in oscillation amplitude and a reduction in elongation, i.e., it suppresses oscillation. Of practical value is the prediction of the deformation of aggregates under the action of a magnetic field for the development of new materials with controllable properties.

Keywords: numerical modeling, forced oscillations, microdroplet aggregates, interfacial tension, magnetic fluid

Chaos-rhythm technology in research of intrinsic electromagnetic field of biological objects

2024. T.12. № 2. id 1570

Aleshkov A.A. Tsvetkov G.A.

DOI: 10.26102/2310-6018/2024.45.2.032

Any living organism has its own biological field, which depends both on the characteristics and state of the living organism and on environmental factors. Under informational influence of external factors, a change in the fractal structure of this field is observed and the formation of special chaotic signals, the parameters of which can serve as a basis for solving various scientific and practical problems. The article presents a technology for studying the electromagnetic fields of biological objects based on an analysis of changes in the chaos structure of broadband chaotic signals of their own electromagnetic radiation generated under the influence of an external informative electromagnetic field with a given strength and modulation-time parameters. To estimate the structure of chaotic signals it is proposed to use such methods of fractal approach as Poincaré mapping, calculation of the corresponding Hausdorff dimensionality and chaos-rhythm parameters. On the basis of the conducted experiments, the presence of a characteristic dependence of chaos-rhythm parameters of own electromagnetic emissions of a bioobject on the characteristics and state of the living organism itself, as well as on the parameters, sequence and rate of change of the external informative electromagnetic field has been established. The degree of informative influence of the external electromagnetic field on a human being is determined, which can exceed the energetic one by some indicators almost 4 times. The possibility of using the proposed technology to solve various scientific and practical problems has been proved: medical studies of the functional state of the organism, assessment and control of the impact of electromagnetic fields on human health, development of means to protect the environment and humans from radio-emitting systems, detection and recognition of bioobjects of a given class.

Keywords: fractal approach, chaos-rhythm, hausdorff dimension, wideband chaotic signal, bioradioinformative technology, biological object, electromagnetic radiation, integral field, information interaction

Developing of an acoustic measuring system for analyzing the composition of substances

2024. T.12. № 2. id 1569

Bochkarev A.V. Lyubimova M.A. Popov K.S.

DOI: 10.26102/2310-6018/2024.45.2.031

The relevance of the study is due to the problem of untimely analysis of the composition of liquid mixtures during their production by enterprises of the food, chemical and oil refining industries. The traditional method of such analysis is carried out after the formation of a batch of products, which is why enterprises incur costs associated with the disposal of defective batches of products. This article is devoted to the development of an acoustic measuring system for analyzing the composition of liquid substances, capable of being used to analyze various liquid products in industry in a continuous mode when transporting these products through the internal industrial pipeline system, which makes it possible to identify defects before the formation of a batch of products, thereby reducing disposal costs. The sounded system, built into the pipeline, contains two measuring channels, including two piezoelectric receivers and one piezoelectric emitter, common to the two channels. As part of this work, equipment is selected based on an analysis of the repeatability of research results, in particular, the possibility of using one or another generator that generates exciting signals for a piezoelectric emitter is considered. The possibility of using excitation signals of various shapes and/or durations is investigated, and repeatability is assessed based on the linear correlation coefficient between several repetitions of experiments with the same type of excitation signal. The need for two measuring channels is analyzed. The materials are of practical value for enterprises producing liquid products, as well as for manufacturers of analytical equipment.

Keywords: acoustic measurement method, piezoelectric transducer, analytical studies, repeatability of results, linear correlation coefficient

Analysis and optimization of organizational system functioning efficiency with automated service devices on the basis of simulation modeling

2024. T.12. № 2. id 1567

Bakulin A.Y. Lvovich Y.E.

DOI: 10.26102/2310-6018/2024.45.2.030

The article considers the approach to the analysis and optimization of the efficiency of network organizational systems in the conditions of intensification of automation and digitalization processes. The class of organizational systems with automated service devices, the result of whose activity is the performance of services, is singled out. The inclusion of service automata in the network structure determines the peculiarity of solving analysis and optimization problems. The analysis is based on simulation modeling of the studied class of systems as mass service systems with varying topology of service channels. Therefore, alternative variables characterizing topology components, which are related to duplication of both components and automated devices as a whole, are defined as optimizable variables. To these variables are added variables affecting customer loyalty by providing discounts in certain time periods. The optimization model is a combination of formalized descriptions of dependencies on the optimized variables of extreme and boundary requirements. As an extreme requirement the necessity of maximizing the income is defined, and the boundary requirements are the time characteristics related to the downtime of the automated devices and service downtime. Algorithmization of the decisions made on the variant of the network system topology and the mechanism for increasing customer loyalty is based on the combination of three components of the iterative search process: analysis of the organizational system under study using a simulation model; simulation of a directed enumeration at random values of alternative variables; final choice on the set of promising options by means of expert evaluation. The structural scheme of the algorithm based on the integration of the above components is proposed.

Keywords: organizational system, automated service devices, simulation modeling, analysis, optimization, expert evaluation

Review of biofeedback techniques in the rehabilitation of posttraumatic stress disorder

2024. T.12. № 3. id 1566

Galushka M.S. Vishnevetsky V.Y.

DOI: 10.26102/2310-6018/2024.46.3.025

Posttraumatic stress disorder (PTSD) is a debilitating psychiatric disorder that can develop after experiencing or a traumatic event. Current treatment approaches include psychotherapy and pharmacotherapy, however, they are not always effective, and some patients may experience residual symptoms or relapse. Biofeedback (BF) is a promising adjunctive treatment for PTSD that focuses on training patients to consciously control their physiological responses to trauma-related triggers. BF involves the use of electronic devices to measure and provide real-time feedback to patients about their physiological functions, such as heart rate, muscle tension, sweating, and brain activity. The analysis of biofeedback data requires the development of specialized algorithms and software, including machine learning and data mining techniques to process large datasets and reveal hidden patterns. This review examines the existing research on the effectiveness of BF, specifically neurofeedback and biofeedback, in the rehabilitation of PTSD. Analysis of 19 randomized controlled trials, conducted between 2014 and 2024, revealed that various types of BF, including neurofeedback, heart rate variability biofeedback, respiratory biofeedback, effectively reduce the severity of PTSD symptoms, as well as comorbid anxiety and depressive disorders. The review also discusses the different BF protocols used in the treatment of PTSD, including the types of sensors used, feedback parameters, and treatment duration. A model for increasing the effectiveness of biofeedback in the treatment of PTSD is presented. Findings indicate that BF can be an effective adjunct or alternative to traditional treatments, particularly in cases of chronic and complex PTSD. Despite promising findings, further research with larger sample sizes and standardized protocols is needed to determine the optimal treatment protocols and the long-term efficacy of BF for PTSD.

Keywords: PTSD, BF, neurofeedback, biofeedback, rehabilitation, information technology, data mining, modeling

Visual and predictive modeling of morbidity arterial hypertension in older age groups and their medical examination

2024. T.12. № 2. id 1565

Gafanovich E.J. Lomakov A.V. Lvovich A.I. Choporov O.N.

DOI: 10.26102/2310-6018/2024.45.2.014

The article discusses the use of the results of an analysis of the dynamics of morbidity indicators and clinical examination of the population of the region based on visual and prognostic modeling of long-term medical and statistical information. Arterial hypertension was chosen as a group of diseases. Medical statistics data from the Voronezh region for 2013-2022 were used. It is proposed to carry out visual modeling of time series characterizing the dynamics of morbidity and clinical examination indicators, based on the analysis of their graphical representation and the use of human visual-figurative intuition mechanisms when comparing visualization results. Visual modeling made it possible to characterize the trend in the annual increase in the incidence of hypertension in the adult population of the Voronezh region and to establish important information for decision-making by healthcare authorities about periods of decreasing incidence growth rates. Another important assessment for government authorities is the adequacy of the clinical examination process to trends in the dynamics of morbidity, which is established by comparing visualization results and is determined by coinciding changes in the graphical presentation of time series of relevant indicators. To use the results of predictive modeling, first of all, a number of methods are compared in terms of the root mean square error of forecasting the dynamics of time series: autoregressive integrated moving average, simple exponential smoothing, linear Holt method, triple exponential smoothing. It is concluded that the first method shows the best result, and the forecast estimates confirm the results of visual analysis. These estimates guide healthcare authorities to maintain the growth rate of resources allocated for medical examinations in the region in future periods.

Keywords: medical and statistical information, morbidity, medical examinations, data visualization, predictive modeling, resource management

Mathematical modeling of cyclic processes in dynamic synergetic systems

2024. T.12. № 3. id 1563

Lebedev V.I.

DOI: 10.26102/2310-6018/2024.46.3.007

The paper investigates the possibility of cyclic behavior of dynamic synergetic systems taking into account nonlinear processes of different increasing orders. The systems are represented in the form of dynamic, nonlinear, differential equations in phase spaces. Phase spaces are formed from the essential variables characterizing the system. Essential variables form a system of "order parameters" for models. Bifurcations in the behavior of a number of models of dynamic synergetic systems have been studied and the processes of the emergence of cyclic behavior in dynamic synergetic systems have been studied. Nonlinear processes in dynamical systems and their changes at special points of phase diagrams are studied. The behavior and stability of synergetic models in the areas of simple elementary catastrophes such as "assembly" and "fold" have been studied. Cyclic processes in the event of an “assembly” type disaster are investigated. A model of cyclical logistic revolutions in regional economies is considered. Cycles in the "soft" Arnold disaster "dovetail" have been studied. The occurrence of cyclic processes, as well as the stability of cycles, has been studied. Methods for model verification and model management capabilities are determined. The areas of phase diagrams for complex nonlinear dynamical systems with cyclic behavior are investigated. Dynamics of cycles in different regions of the phase space for synergetic systems is discussed. The problems of verification and control of models with the possible appearance of cycles are identified, and the emergence of higher order cycles is discussed.

Keywords: mathematical models, synergetic systems, phase spaces, catastrophes, bifurcations, cyclic processes, model verification, cycle stability

Microservice architecture in cloud systems: risks and application opportunities in 2024–2030

2024. T.12. № 2. id 1561

Malygin D.S.

DOI: 10.26102/2310-6018/2024.45.2.029

Microservices architecture (MSA) represents a modern approach in software development, aimed at enhancing flexibility, scalability, and resilience to changes in both business and technological requirements. This study focuses on identifying and analyzing the opportunities and risks of applying MSA within the context of operating systems (OS), which is particularly relevant against the backdrop of accelerating digitalization and increasing software demands. The objective of the study is to assess and forecast the role of MSA in the future of OS, including an analysis of current trends and predictions for the coming decade. The research methodology is based on a comparative analysis of microservices and monolithic architectures and includes data from current research works dedicated to MSA. The main findings of the study underscore the significant increase in efficiency and performance of software systems through the implementation of MSA, demonstrated by the acceleration of development and improvement of continuous integration and delivery (CI/CD) capabilities, as well as enhanced system resilience. Key risks and issues related to the use of microservices were also identified and systematized, including management challenges and potential security threats, highlighting the need for the development of specialized tools and approaches for security and monitoring of microservices systems. The value of this research lies in providing a deep understanding of the role and place of MSA in modern OS, offering a comprehensive analysis of risks and opportunities, serving as a foundation for developing effective implementation and utilization strategies of microservices. The results and recommendations contribute to the improvement of practical skills and the development of concepts in system architecture, providing valuable guidance for IT professionals, system architects, and developers in the field of software optimization and enhancing its reliability and performance.

Keywords: microservice architecture, cloud systems, flexibility, scalability, security, continuous integration

Algorithms for computer modeling of the “flow tube – liquid” system of a Coriolis flow meter and processing its results

2024. T.12. № 2. id 1560

Gudkova E.A. Tarantseva K.R.

DOI: 10.26102/2310-6018/2024.45.2.028

Mathematical modeling of the «flow tube – liquid» system represents a current direction in engineering and scientific practice, since it allows optimizing the design of flow tubes, assessing the influence of various factors, such as pressure, temperature, viscosity and liquid composition on the operation of the system without the need for complex and expensive full-scale experiments. In this regard, this article is aimed at developing algorithms for implementing a mathematical model of the «flow tube – liquid» system of a Coriolis flow meter. The work synthesized an algorithm for developing a numerical model in the multiphysics modeling package COMSOL Multiphysics, which made it possible to increase the reliability of the simulation and reduce the complexity of creation and debugging through the use of the modular principle. A computational algorithm has been developed and a mathematical description of the calculation of the average time delay of signals from Coriolis flow meter sensors has been performed. The algorithm uses a linear interpolation method based on known data points obtained as a result of a computational experiment. An algorithm for running a program in Python using the Comsol API is proposed, which automates the processing of data arrays and the calculation of average time and phase delays. The algorithms are implemented using the UML language in the Enterprise Architect software product. The materials of the article are of practical value for specialists in the field of numerical modeling and optimization of Coriolis flow meter parameters.

Keywords: «flow tube – liquid» system, coriolis flow meter, computer modeling, numerical model, computational experiment

Structurization of investment management of multi-object organizational system at the stages of formation and implementation of the development program using optimization approach

2024. T.12. № 2. id 1559

Bukholtsev I.M.

DOI: 10.26102/2310-6018/2024.45.2.017

The article proposes structural solutions related to the construction of the investment management system of a multi-object organizational system and its detailing for making managerial decisions at the stages of formation and implementation of the development program. It is shown that the structuring of the management process is determined by the peculiarities of a number of components: information support, requirements of the control center, mechanisms of expert evaluation, the need to balance investments at the stage of formation of the development program and rebalancing - at the stage of implementation. Intellectual support of management decision-making is carried out using monitoring information, prognostic and optimization modeling. The sequence of procedures within the framework of the structural scheme of investment balancing process management at the formation of the development program of a multi-object organizational system is substantiated. The procedures that require the involvement of expert evaluations for their realization are specified. The transition to optimization modeling on the basis of transforming the requirements of the control center into a formalized description of extreme and boundary requirements is considered. The possibilities of structuring the management of the investment rebalancing process in the implementation of the development program of a multi-object organizational system are determined on the basis of the availability of information resources that allow to form time series of performance indicators and to train predictive models on this basis. The tasks and methods of optimization of the management decision-making process using predictive models are characterized.

Keywords: structurization, management, multi-object organizational system, monitoring, forecasting, optimization modeling

Formalization of a multi-criteria transport task with time constraints

2024. T.12. № 2. id 1557

Belykh M.A.

DOI: 10.26102/2310-6018/2024.45.2.027

The article considers the mathematical formulation of a multi-criteria transport problem with time constraints. The criteria in it are the cost of transportation, their importance and the time spent on transportation. A feature of this task is the presence of time constraints, such as time windows for customers and the duration of stay of vehicles on the road. As a solution to the multi-criteria problem, the selection of Pareto optimal points is proposed, since this optimization method has a wide range of tasks to apply. The formulation of pareto optimization and the definition of pareto optimality are given. Pareto optimization methods are considered: the lexicographic method and scalarization, the varieties of which are the method of ε-constraints, which is based on the gradation of optimization criteria in descending order of their importance, and the method of linear scalarization, the mechanism of which is based on combining all optimization functions into one. Using the example, we consider the reduction of a formalized multicriteria transport problem to a form suitable for scalarization. The definition of pareto efficiency seems acceptable for the implementation of its mechanisms as part of an adaptive decision support system aimed at solving optimization problems in various fields and operating with heuristic algorithms.

Keywords: optimization problem, multi-criteria transport problem, time-bound problem, pareto optimization, pareto optimality, decision support systems

Numerical method for solving the problem of rational location of technical means of traffic management

2024. T.12. № 3. id 1556

Arutiunian M.A.

DOI: 10.26102/2310-6018/2024.46.3.021

The article presents one of the scientific results obtained by the author during his dissertation research  a combined numerical method for solving the problem of rational placement of technical means of traffic management, based on the use of the gradient descent method together with the Newton-Raphson method. One of the pressing problems of the development of a modern city is raised, which is the formation of a convenient and safe road and transport infrastructure. According to statistics, in the Russian Federation every year almost 20% of the total number of road accidents occur in collisions with pedestrians outside pedestrian crossings. As one of the solutions to the problem under consideration, it is proposed to install technical means of organizing traffic, in particular pedestrian crossings, on those streets on which they are either irrationally located or absent altogether. A mathematical model for the rational placement of technical means of traffic management has been developed and a numerical method for its solution has been proposed. It is noted that the combined numerical method proposed by the author allows one to quickly and accurately find the optimal parameters for the developed mathematical model, which helps to improve its performance and accuracy. It is generalized that the joint application of the considered numerical methods is a fairly effective way to solve the problem.

Keywords: numerical methods, gradient descent method, newton-Raphson method, technical means of traffic management, road safety

The Markov model of cyber attacks and its application to the analysis of information security in automated systems

2024. T.12. № 2. id 1554

Trapeznikov E.V. Magazev A.A. Kasenov A.A.

DOI: 10.26102/2310-6018/2024.45.2.011

The paper presents a description of the Markov model of cyber attacks as a method for analyzing information security in automated systems. Based on the presented model, the work provides a description of two safety metrics - the average time to safety failure (the average number of transitions between states in the corresponding Markov chain before it first enters one of the absorbing states) and the average risk in case of safety failure (the sum of the products of damages during the implementation of each from cyber attacks to the corresponding probabilities of these cyber attacks). An algorithm for estimating input parameters is given based on the relationship between the threat and vulnerability databases CVE, CWE and CAPEC. The relationships described in the work allow us to calculate the vector of probabilities of the occurrence of cyber attacks and the vector of damage from cyber attacks, which are formed as input data for the security assessment model. The paper also addresses the problem of numerical estimation of parameters through CVSS metrics. The study demonstrates that the vector of probabilities of repelling cyber attacks and the vector of probabilities of “delays” of cyber attacks can only be obtained using the method of expert assessments or statistics. The work also provides a description of the developed software product, which allows one to assess the security of an automated system over a given period of time.

Keywords: security metrics, CVSS metric, CVE, CWE, CAPEC, cyberattack model, data collection algorithm, automated system, markov chain, expert assessment method

Information and measuring system of the pneumatic actuator of an industrial robot of specialized purpose model MP-11

2024. T.12. № 2. id 1553

Sandler I.L. Ivanov D.V. Portnov A.A.

DOI: 10.26102/2310-6018/2024.45.2.026

One of the most important tasks faced by developers of pneumatic automation systems is to reduce the time of analysis and design at the research stage. The use of specialized software makes it possible to significantly improve the operation of pneumatic automation systems. Simulation of pneumatic robotic manipulators allows you to identify vulnerabilities, optimize control processes, conduct virtual tests of various work scenarios, which will help improve planning and management, while achieving significant improvements in system performance and reliability. The article presents an information and measuring system for the pneumatic drive of the robot (manipulator) links for specialized industrial purposes of the MP-11 model in the form of a simulation model, which is implemented by the method of simulation of pneumatic systems on the FluidSIM-P (FluidSIM Pneumatic) package of the Festo company. The result of the operation of the information and measuring system are graphs of transient processes of movement of the rods of pneumatic cylinders, which adequately describe the real operating mode of the pneumatic actuator of the manipulator MP-11. The materials of the article are of practical value for specialists involved in the design and analysis of automation systems. In addition, the results of the article may be useful for students and researchers studying the field of automation and system design. Anyone interested in the application of automation technologies in various fields will find valuable information in the article for their work and research.

Keywords: information and measurement system, robot, MP-11, simulation model, pneumatic circuit, transients, fluidSIM-P, pneumatic

Protection against multiple memory faults

2024. T.12. № 2. id 1551

Lepeshkina E.S.

DOI: 10.26102/2310-6018/2024.45.2.025

The problem of multiple faults in the memory chips of on-board equipment of spacecraft as a result of the impact of individual nuclear particles in outer space is considered. A review of the literature showed that the danger of multiple failures is real and will increase as technological standards for the design of electronic components decrease. Double multiple faults are currently the most pressing threat, as they are caused by charged particles with relatively low energies. Double faults can be adjacent or non-adjacent. Adjacent double faults are caused by the simultaneous action of a single nuclear particle. Non-adjacent faults are the result of the accumulation of single failures that occurred at different times in different storage cells of the same memory word. Under certain conditions, the occurrence of double non-contiguous errors can be avoided. To protect against double adjacent errors, correcting codes are used. These codes are relatively new and there is no general description of their construction. These codes are guaranteed to correct single errors and double adjacent errors, but have a significant probability of erroneously correcting a non-adjacent double error. But when moving to practical use, it is necessary to determine the requirements for the type of check matrix for these codes, to find a general algorithm for their construction for different memory word lengths, with low redundancy and high performance, provided that the correcting abilities of the code are subject to the requirements of detecting and correcting only single and double adjacent errors and no additional ones.

Keywords: single memory failures, single and multiple faults, double faults, frequency of multiple faults, measures to protect against multiple failures, double error correction codes