Інфокомунікаційні та комп’ютерні технології最新文献

{"title":"MATHEMATICAL MODEL OF THE INTERACTION OF STATIONARY SH-WAVES WITH A SYSTEM OF CURVILINEAR CRACKS IN A HALF-SPACE","authors":"Borys Panchenko, Liudmyla Bukata, Denys Bahachuk","doi":"10.36994/2788-5518-2023-01-05-09","DOIUrl":"https://doi.org/10.36994/2788-5518-2023-01-05-09","url":null,"abstract":"A method for solving mathematical physics problems is proposed for semi-infinite media containing systems of curved crack-slits. Most of the studies known from the literature relate to the problems of diffraction of elastic waves on straight and circular cuts. However, in reality, the crack is usually not straight or circular. Studies have shown that the curvature of a crack significantly affects the value of the dynamic stress intensity coefficients. The value of this parameter also depends on the proximity of the defects to each other, since they always fall within the range of the reflected wave. The stress-strain state of media with complex properties can be effectively modeled by computing complexes in combination with software systems. Most studies are devoted to the development of the finite element method. However, the method of integral equations is very effective for solving anti-planar problems of diffraction theory. The advantage of this method is the reduction in the number of spatial variables, the high speed of convergence, and the possibility of using various efficient numerical solution methods. The method also has the ability to build efficient parallel computing schemes. A unified approach to solving the problem is developed on the basis of singular integral equations (SIEs). The corresponding dynamic boundary value problems for a clamped and force-free half-plane are investigated. The influence of the defect curvature, their interaction, and the proximity of the boundary on the magnitude and nature of the dynamic stress intensity coefficients is studied. Parallel algorithms allow to significantly reduce the computation time and analyse the characteristics of the wave field in more detail. The combination of the SIE method, which reduces the dimensionality of the problem by one, and provides significant savings in computing time due to the parallelization of computational procedures, leads to a significant increase in the efficiency of the proposed algorithm. The method can be used to assess the influence of various mechanical or geometric factors on the strength of bodies with defects.","PeriodicalId":165726,"journal":{"name":"Інфокомунікаційні та комп’ютерні технології","volume":"95 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135105996","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"MATHEMATICAL MODEL OF EVENTS MONITORING IN THE MANAGEMENT SYSTEM OF DISTRIBUTED DATABASES BASED ON EVENT SENSORS","authors":"Yaroslav Kornaga, Andrii Barabash","doi":"10.36994/2788-5518-2023-01-05-17","DOIUrl":"https://doi.org/10.36994/2788-5518-2023-01-05-17","url":null,"abstract":"Methods of increasing the effectiveness of threat detection in distributed databases using the event monitoring system are considered in the work. It is noted that the system works on the basis of the event monitoring model of heterogeneous distributed databases. This model involves three stages of event processing, which are based on appropriate methods. It is highlighted that the mechanisms underlying the functioning of the mentioned methods should be reduced to a single data format to eliminate the possible appearance of incorrect work in future calculations. The event processing method on the monitoring server allows for processing event matrices and transferring the function to control tools, on the basis of which appropriate decisions are made to improve reliability. The article develops a modified method of analyzing and monitoring events in non-relational distributed databases. Event monitoring options for lookup operations in distributed databases are offered. To confirm the theoretical results, mathematical modeling and experimental research on monitoring parameters and data processing speed on the event monitoring server were carried out. The number of detected incidents and the number of incorrectly identified events were studied, which in turn allowed for the protection of information from unauthorized actions or changes. Also, it should be emphasized that the model proposed in the work describes detailed monitoring of requests, transactions, and stored procedures in a database with information about possible incidents in real time and prompts intrusion warnings. In addition, the features of the proposed model make it possible to investigate and monitor the emergence of new vulnerable segments of the database and promptly respond to them, eliminating threats to access channels. The paper compares the speed of data processing based on files and database tables, which allows for fully performing experiments and confirming analytical data experimentally.","PeriodicalId":165726,"journal":{"name":"Інфокомунікаційні та комп’ютерні технології","volume":"27 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135106000","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"SIMULATION OF A MULTIPATH COMMUNICATION CHANNEL","authors":"Vitaly Pochernyaev, Viktoriia Sushanova","doi":"10.36994/2788-5518-2023-01-05-05","DOIUrl":"https://doi.org/10.36994/2788-5518-2023-01-05-05","url":null,"abstract":"In the article, the simulation of a multipath communication channel with two bands or subbands (intervals) of frequencies, the system function of which is expressed in a closed form through elliptic functions. A multipath communication channel is a linear system with time various parameters. Multipath leads to the fact that there is always a certain number of errors. They characterize the lower limit of the probability of errors, regardless of the applied methods of error-correcting coding and an unlimited increase in the energy potential of the radio link. Mathematical simulation of a multipath communication channel provides the joint consideration of time delays and Doppler frequency shift of the received signal. The correlation between the transfer function 퐻 (휔,푡) and the system function 푆 ̃(휏,휔 ̃) is shown. Іn the article at the first time, the mathematical theory of elliptic functions and elliptic integrals is applied to the definition of a system function, which in known literature sources is determined using the mathematical methods of statistical analysis. In article is shown the application an approach to mobile radio systems, which are operating in several frequency bands, such as a combined mobile digital troposcatter-radiorelay station or a digital troposcatter station. Their work is carried out in two frequency bands or two frequency subbands (transmit / receive). Therefore, in this case it becomes very difficult to create a mathematical model of a multipath communication channel with the definition of system functions. This situation is complicated if a frequency adaptation system is used. At the same time, several frequency intervals are used to combat fading and interferences, in the simplest case – two intervals. The article describes the approach to the representation of system functions through elliptic functions. This allows to have close form of the transfer function for the multipath communication channel. For the considered case of two-frequency intervals, the final expression is written in terms of theta-functions and the complete elliptic integral of the first kind.","PeriodicalId":165726,"journal":{"name":"Інфокомунікаційні та комп’ютерні технології","volume":"7 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135106172","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"COMPARISON OF BIG DATA CLASSIFICATION ALGORITHMS BY SIMULATION METHODS","authors":"Nick Odegov, Matin Hadzhyiev, Liudmyla Bukata, Liudmyla Glazunova, Marina Kochetkova","doi":"10.36994/2788-5518-2023-01-05-15","DOIUrl":"https://doi.org/10.36994/2788-5518-2023-01-05-15","url":null,"abstract":"With the development of information transmission and storage technologies, the volumes of data that require processing and analysis are growing rapidly. Therefore, the task of developing algorithms for solving various artificial intelligence problems for Big Data volumes is urgent. In our works, this informal term \"Big Data\" refers to situations when known processing algorithms do not allow solving a problem in a practically acceptable time. With regard to classification tasks, such conditions are possible when the first place is not even high reliability (that is, the minimum number of errors), but productivity (classification speed). The well-known method of nearest neighbors is one of the most productive. However, the indicator of the order of growth (the number of typical operations) for it is K x M x N, where K is the number of nearest neighbors, M is the number of classes, N is the typical number of class elements. Along with this, we propose to consider algorithms based on the principles of M-means, where classes are replaced by only a small number of their characteristics. Among such algorithms, the article considers: the algorithm of class centers and the algorithm of adaptive rules. The order of growth for these algorithms is only M according to the number of classes. The comparative analysis of these algorithms is performed by the method of simulation modeling. Simulation models are implemented by the Adaptive Metrics program, developed at the Department of Software Engineering at DUITZ. In this program, the classification problem is solved using the example of the dichotomy problem for classes A and B. The program has the possibility of very flexible setting of models. Problems can be solved in 1-dimensional, 2-dimensional,..., 6-dimensional spaces. The distribution of factor values for classes A and B can have quite different statistical characteristics - from uniform and triangular distribution functions to functions approaching a normal distribution. The graphical interface of the program allows you to dynamically observe the solution of the classification problem in one-dimensional, two-dimensional and 6-dimensional projections. As a result of multiple runs of the program, it was established that the algorithms of the nearest neighbors slightly outperform the algorithms of class centers and adaptive rules according to the criterion of reliability, and also comply with the principle of compactness (concentration of the largest number of erroneous solutions in the hypercube of errors). Algorithms based on M-means principles significantly outperform this algorithm in terms of performance. Also, the algorithm of adaptive rules best corresponds to the principle of equality of classes and is the most productive of the considered ones.","PeriodicalId":165726,"journal":{"name":"Інфокомунікаційні та комп’ютерні технології","volume":"27 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135106175","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"JUSTIFICATION OF FAST CLASSIFICATION ALGORITHMS ON BIG DATA SETS WITH RELIABILITY AND PERFORMANCE CRITERIA","authors":"Nick Odegov, Matin Hadzhyiev, Liudmyla Bukata, Liudmyla Glazunova, Marina Kochetkova","doi":"10.36994/2788-5518-2023-01-05-16","DOIUrl":"https://doi.org/10.36994/2788-5518-2023-01-05-16","url":null,"abstract":"Classification methods are among the simplest and \"oldest\" methods of artificial intelligence. This article discusses fast algorithms that can be used to solve Big Data problems. Big Data is a case when the methods and tools used do not allow solving the problem in a pleasant time. Therefore, when solving this type of problem, an important criterion is the performance of classification algorithms. Productivity in this sense refers to potential decision-making time. This time depends on the constructive dimension of the algorithm - the number of typical operations for making a decision. In addition, the execution time of the program depends on the typical operations of the algorithm. The article considers productive algorithms based on M-means principles. At the same time, all possible representatives of classes are replaced by a small number of characteristics of these classes. In the simplest form, these algorithms boil down to the fact that classes are replaced by class centers based on the results of training. Such centers are defined as vectors of average values over all one-dimensional projections of the factor space. Distance measures from these centers in Euclidean and other metric spaces are used to classify unknown objects. Methods of rapid adaptation of these characteristics in learning algorithms are considered. The theoretical justification of the algorithms of adaptive metrics and adaptive rules is given. It is shown that M-means algorithms can be effective in the case that the number of class representatives is extremely large, and the number of classes and the dimension of the factor space are relatively small. The advantages and disadvantages of the considered algorithms are noted. The scope of their practical application is outlined. The principles of spreading these algorithms to a wide range of practical problems are also shown. An example of a comparison of a number of classification algorithms based on reliability and performance criteria is given. It was concluded that the algorithm of adaptive rules is the most effective for a significant number of problems.","PeriodicalId":165726,"journal":{"name":"Інфокомунікаційні та комп’ютерні технології","volume":"95 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135106002","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"DESCRIBING THE KNOWLEDGE ABOUT THE SOURCE CODE USING AN ONTOLOGY","authors":"Andrii Tkachuk, Bogdan Bulakh","doi":"10.36994/2788-5518-2023-01-05-14","DOIUrl":"https://doi.org/10.36994/2788-5518-2023-01-05-14","url":null,"abstract":"This research focuses on the use of ontologies as formal knowledge bases for representing source code in automated systems.By creating an ontology that represents the concepts, relationships, and properties of source code elements, it becomes possible to capture and organize knowledge about the codebase. This enables various functional abilities such as automated code analysis and reasoning about code structure and behavior. The aim of this research is to verify the ability to use ontology as a formal knowledge base about source code in automated systems. A review of the recent articles showed that existing tools to work with ontologies does not provide direct functionality to convert the code into a knowledge, so the idea proposed in the article has novelty. The research explores the use of the Web Ontology Language (OWL) as the primary ontology representation language due to its expressiveness, reasoning capabilities, and compatibility with semantic web standards. The research proposes the creation of ontology representations for various code entities, with classes representing main entity types and individuals representing specific instances within the codebase. To validate the concept and demonstrate the expected results, a proof-of-concept system is built, consisting of a parsing client, a RESTful API for communication, and an ontology manager. The system utilizes libraries such as SwiftSyntax for parsing Swift code, Alamofire for HTTP communication, and OWL manipulation libraries (such as OWL-API and ONT-API) for working with ontologies. The system aims to extract knowledge from the source code, convert it into ontology entities and axioms, and reason over the ontology using a reasoner (such as HermiT). The research concludes that ontologies can effectively store knowledge about source code and enable various further manipulations on that knowledge. However, further investigation is needed to determine the optimal set of properties and entities that should be supported by the code ontology extraction system to infer more knowledge about the source code.","PeriodicalId":165726,"journal":{"name":"Інфокомунікаційні та комп’ютерні технології","volume":"21 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135106173","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"OPTIMIZATION OF THE ANALOG MODULE ACCORDING TO NOISE CHARACTERISTICS IN THE ON-BOARD DETECTOR OF THE RECORDER-ANALYZER FOR THE IDENTIFICATION OF CHARGED PARTICLES","authors":"Nikita Yezerskyi, Andriy Movchanuk","doi":"10.36994/2788-5518-2023-01-05-12","DOIUrl":"https://doi.org/10.36994/2788-5518-2023-01-05-12","url":null,"abstract":"In analog amplifiers of weak signals, the question arises of finding the optimal signal/noise ratio based on noise characteristics for further discretization of the signal by digital methods. Using computer simulations is not a solution to this problem. Because the developers of electronics simulators do not reveal the progress of calculations as usual, or provide the opportunity to independently enter formulas for calculation with the unpredictable probability of forecasting results.In current work, a method for calculating and optimizing the noise level has been developed. It is proposed to be used for debugging circuits based on operational amplifiers, which will save time and money during further testing and optimization of the circuit before its manufacture. And the developers in the datasheet specify the noise parameters without taking into account all the cascade (with open feedback loop, etc.). That is why, a method is needed that takes into account the noise parameters of the switching circuit. The key parameters of the cascades, which have an impact on the reliability of sampling, are among other types: inherent noises of operational amplifiers and thermal noises of the elements of the switching circuit, which are optimized by reduction to a single basis and checked for compliance with the research objectives. In addition, the sequence of actions that establishes the accuracy of discretization of the system with the influence of noise voltage is described.As a result, the solution of the noise level minimization problem by simplified computer calculation is accelerated. Signal-to-noise ratio optimization achieved by non-linear programming method.The proposed method can be used both for analysis discrete and integrated circuits. The results of the work have been used for optimization of the existing analog scheme of the small-caliber spectrometer MiRA_ep that is planning to be launched into low near-Earth orbit to study the nature of the high-energy electron and proton microbursts.","PeriodicalId":165726,"journal":{"name":"Інфокомунікаційні та комп’ютерні технології","volume":"22 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135105998","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"BULK SHEAR WAVES IN A LAYER-PERIODIC STRUCTURE \"PIEZOELECTRIC - SLOT\"","authors":"Volodymyr Levchenko, Volodymyr Pavlenko, Peter Talanchuk","doi":"10.36994/2788-5518-2023-01-05-22","DOIUrl":"https://doi.org/10.36994/2788-5518-2023-01-05-22","url":null,"abstract":"A large number of scientific works are devoted to the problems of propagation of waves of different physical nature in periodic and heterogeneous media. The main problem considered in the article was the study of the shear wave in the layered-periodic structure \"piezoelectric - gap\". The statement is given and the problem of the propagation of volumetric acoustoelectric elastic shear waves in a regularly layered piezoelectric-slit medium is solved. Dispersion relations were obtained, which allow to investigate the possibility of propagation of wave fields with an arbitrary geometry of the period of the structure. A comparison of the spectra of the dispersion curves for volumetric acoustoelectric waves in a regularly layered space was carried out. The obtained dispersion relations were also analyzed numerically, and the results are presented in the form of graphs. Graphs of the limits of the boundaries of the transmission zones for various types of geometry of the generating layer package are given. As a result of numerical experiments, the possibility of the existence of transmission zones for bulk acoustic-electric waves in regularly layered media of the \"piezoelectric - slot\" type was established.","PeriodicalId":165726,"journal":{"name":"Інфокомунікаційні та комп’ютерні технології","volume":"95 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135106170","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"POLARIZER ON A SECTOR WAVEGUIDE PARTIALLY FILLED BY DIELECTRIC","authors":"Vitaly Pochernyaev, Mariia Mahomedova","doi":"10.36994/2788-5518-2023-01-05-03","DOIUrl":"https://doi.org/10.36994/2788-5518-2023-01-05-03","url":null,"abstract":"In the article a polarizer based on a sector waveguide partially filled by dielectric is studied. The design of a polarizer based on a sector waveguide with smaller dimensions of the dielectric plate and a better coefficient of the standing wave rectangular waveguide - polarizer on sector waveguide - rectangular waveguide junction compared with rectangular waveguide-polarizer based on a circular waveguide -rectangular waveguide junction has been developed. The diagrams of the articulateon of the waveguide segments of the antenna-feeder path on rectangular waveguides with a polarizer on a sector waveguide and with a polarizer on a circular waveguide are shown. Formulas for the propagation constant of a sector waveguide partially filled with a dielectric and the effective permittivity of a sector waveguide are given. The dependences of the relative permittivities of a waveguide with a sector dielectric plate parallel and perpendicular to the plane of polarization of the incident wave on the average thickness of the sector dielectric plate are presented. The paper analyzes a sector waveguide partially filled with a dielectric, which has휃=휋/3 и 훷=휋/6. In this case, the scalar eigenfunction of the sector waveguide for the quasi-퐻ଷଵ wave is used. The corresponding dependences of the change in the differential phase shift in the considered wave range on the average thickness of the sector plate are presented. At small thicknesses of the phasing plates the decrease in the polarizer broadband is due to an increase in the phase shift in the long-wavelength part of the range and at large thicknesses in the short-wavelength one. By choosing the permittivity of the material, it is possible to increase the broadband of the polarizer at the expense of some increase in the length of the plate. The dependence of the standing wave coefficient of the junction rectangular waveguide - polarizer - rectangular waveguide on the value 휆/휆଴. The standing wave coefficient for the junction of rectangular waveguide - polarizer on a sector waveguide - rectangular waveguide is 3...5 % less than for a junction of rectangular waveguide - polarizer on a circular waveguide - rectangular waveguide. A polarizer based on a sector waveguide with a dielectric plate has an advantage over a polarizer based on a circular waveguide with a dielectric plate when building antenna-feeder paths on rectangular waveguides. This advantage consists in achieving a lower value of the standing wave coefficient on the waveguide section of the path with a polarizer and a shorter length of the dielectric plate – 1,25휆଴.","PeriodicalId":165726,"journal":{"name":"Інфокомунікаційні та комп’ютерні технології","volume":"36 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135106177","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"DECOMPOSITION OF THE NON-STATIONARY RANDOM PROCESS MODEL","authors":"Vyacheslav Tikhonov, Valeriy Bezruk","doi":"10.36994/2788-5518-2023-01-05-11","DOIUrl":"https://doi.org/10.36994/2788-5518-2023-01-05-11","url":null,"abstract":"In the work, the peculiarity of the task of constructing the decomposition of a non-stationary model of a random process is studied using the examples of the analysis of two types of real data. The peculiarities of the decomposition of the model of a non-stationary random process are considered. It consists in the separate definition of an arbitrary trend, a seasonal component and a stationary component. This allows solving, for example, forecasting tasks. This task means several steps ahead in predicting the values of a random process. Some problems that arise when using the autoregression-integrated moving average (ARIMA) model for the decomposition of the model of a random non-stationary process are shown. The results of research on real data are given. They demonstrate the process of decomposition of a model of a non-stationary random process. The analyzed classes of random non-stationary processes with a trend allow us to solve two main problems with acceptable accuracy. The first task involves the decomposition of a model of a random non-stationary process. It includes the calculation of an arbitrary trend, a quasi-periodic seasonal component and a stationary component of the process. The second task involves the actual forecasting of a non-stationary time series using the ARIMA model. In the ARIMA model, it is assumed that the trends are deterministic and are linear, quadratic or higher order polynomials. The seasonal component is periodic and has equal counts in each period, which can be removed through the subtraction period. If the seasonal component does not satisfies these requirements, then when it is removed by difference operators, problems arise and the ARIMA model may lose accuracy.","PeriodicalId":165726,"journal":{"name":"Інфокомунікаційні та комп’ютерні технології","volume":"21 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135105997","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}