http://elartu.tntu.edu.ua/handle/lib/54139 2026-10-13T11:17:29Z 2026-10-13T11:17:29Z Kramar, Taras Kramar, Oleksandr http://elartu.tntu.edu.ua/handle/lib/54156 2026-10-13T09:32:12Z 2026-03-24T00:00:00Z

Назва: A digital guide app for exhibitions: a case of Ternopil Regional Local Lore Museum Автори: Kramar, Taras; Kramar, Oleksandr Короткий огляд (реферат): The article analyzes approaches to creating digital information guides to support the activities of small museums of local importance. Recommendations have been developed for the implementation of a digital application based on industry standards in working with exhibits, an intuitive method of interaction with a visitor to a museum exhibition and providing user-friendly support for his individual track through the museum. The use of photogrammetric methods is proposed to create HD-textured 3D models of artifacts that are the central exhibits of collections in order to raise the museumʼs recognition, increase user interest and create a positive response from visitors. The practical implementation of the digitalization technology of historical and cultural heritage was carried out using selected exhibits from the Ternopil Regional Local Lore Museum as an example.

2026-03-24T00:00:00Z Nykytyuk, Vyacheslav Dolinskyi, Andrii http://elartu.tntu.edu.ua/handle/lib/54154 2026-10-13T09:31:58Z 2026-03-24T00:00:00Z

Назва: Application of large language models in generating Ukrainian corpora for training text classification systems Автори: Nykytyuk, Vyacheslav; Dolinskyi, Andrii Короткий огляд (реферат): This study deals with the application of modern Artificial Intelligence technologies, mainly deep learning methods based on recurrent neural networks of the Long Short-Term Memory (LSTM) type, for the construction and analysis of Ukrainian-language corpora. The research attention is directed to the automated classification of text sentiment (tonality), which involves distributing texts into positive, neutral, and negative categories. This, sequentially, testified the effectiveness of the proposed algorithmic solutions and their suitability for the tasks of analyzing the emotional tone of Ukrainian-language content.

2026-03-24T00:00:00Z Kovalenko, Yevhen Chernetskyi, Sergiy http://elartu.tntu.edu.ua/handle/lib/54155 2026-10-13T09:32:06Z 2026-03-24T00:00:00Z

Назва: Investigation of the influence of contact interaction conditions on the stress-strain state of an elastic bilayerbody Автори: Kovalenko, Yevhen; Chernetskyi, Sergiy Короткий огляд (реферат): The aim of this work is to investigate the influence of complex contact interaction conditions on the stress-strain state of an elastic bilayer body of finite dimensions. The case of loading the body with a perfectly rigid, smooth, flat indenter is considered. The following variants of contact interaction between the layers are compared: perfect bonding, possible delamination of smooth layers without slip, and slip between layers with friction forces according to the Coulomb-Amontons law with possible delamination. The contact, bonding, and slip planes are not known in advance and are determined as a result of solving the problem. Using the theory of variational inequalities, the problem is formulated as a quasi-variational inequality. The inequalities are associated with a sequence of minimization problems for functionals over the set of admissible displacements. At each step of the sequence, the normal stresses on the contact surface are determined based on the results of the previous iteration. The obtained variational problems are discretized using the finite element method. Quadratic rectangular finite elements are used for the calculations. Characteristic features of the stress-strain state depending on the contact conditions between the layers and the indenter are revealed. The influence of the indenter length and the order of arrangement of layers with different mechanical properties on the stress-strain state is considered. Placing the stiffer layer at the bottom promotes a more uniform stress distribution in the body. The lowest stresses in the body occur in the case of perfect bonding of the layers when the stiffer layer is at the bottom. Increasing the indenter size can eliminate lag and significantly reduce interlayer slip.

2026-03-24T00:00:00Z Zhykhariev, Vladyslav Shapovalova, Mariia Vodka, Oleksii Misiura, Serhii http://elartu.tntu.edu.ua/handle/lib/54151 2026-10-13T09:32:40Z 2026-03-24T00:00:00Z

Назва: Numerical study of the size effect and nucleation center concentration on the elastic properties of copper Автори: Zhykhariev, Vladyslav; Shapovalova, Mariia; Vodka, Oleksii; Misiura, Serhii Короткий огляд (реферат): This article presents the results of a numerical study on the influence of representative volume size and the concentration of initial nucleation centers on the elastic properties of polycrystalline copper, taking into account the anisotropy of its microstructure. The modeling was carried out in a voxel-based system using the finite element method within a numerical analysis environment, applying periodic boundary conditions. This approach enables the simulation of an infinite material structure and avoids edge effects. Three-dimensional geometric models of cubic specimens ranging in size from 5 to 20 voxels were constructed at various concentrations of crystallization points (from 5% to 25%). For each configuration, 100 independent statistical realizations with randomly distributed initial points were performed. This made it possible to obtain reliable estimates of the mean values and variances of the key mechanical properties. The effective values of Young’s modulus, shear modulus, and Poisson’s ratios were calculated depending on geometric parameters and microstructural variability. The distributions of the obtained values were analyzed using histograms and statistical parameters of the normal distribution. The results showed that increasing the size of the representative volume and the number of crystallization points reduces result variability and leads to convergence towards a stationary mean value. The maximum deviation of Young’s modulus across all realizations did not exceed 1.91%, indicating high stability and reproducibility of the calculated properties. It is shown that accounting for anisotropy through an appropriate grain orientation model enables significantly more accurate simulation of polycrystalline material behavior under various loading conditions. The proposed approach can be useful for improving the accuracy of numerical predictions of elastic properties in copper-based components and optimizing technological processes that shape the microstructure. Furthermore, the results can be applied in the design of structural elements with predictable stiffness characteristics, taking into account the internal structure and its influence on the macroscopic behavior of the material.

2026-03-24T00:00:00Z Gashchyn, Nadia Glado, Sergii Kryva, Nadia Semenyshyn, Halyna http://elartu.tntu.edu.ua/handle/lib/54152 2026-10-13T09:32:51Z 2026-03-24T00:00:00Z

Назва: Maintaining the required temperature deformations of the viscoelastic disc Автори: Gashchyn, Nadia; Glado, Sergii; Kryva, Nadia; Semenyshyn, Halyna Короткий огляд (реферат): In the process of creating various equipment, machines, mechanisms, devices and other constructions, the technological process of thermal shrink fit is often used. It is reasonable to heat ring discs for fitting them on round axes or in cylindrical holes in order to achieve energy savings by using time-varying power of heat sources. The mathematical model of seating is described using the thermo-viscoselasticity equations, which take into account the heating modes, thermal, elastic and viscous characteristics of the material. The physical relations for a viscoelastic body are presented according to the Maxwellʼs model. The problem is to heat the disc using heat sources with time-varying heat output so that the displacement on the inner contour becomes equal to the required displacement during heat treatment. The problem of thermal viscoelasticity is solved using the method of small parameter, and the integral equation for finding the law of time-varying specific power of heat sources, which ensures the creation of the required displacement on the inner contour of the disc for a given time, is obtained. The materials presented in this research are aimed at further development of the method of thermo-viscoselasticity in accordance with the solution of two-dimensional problems of optimal control and placement of axisymmetric thermal sources in order to create a certain radial displacement for a certain time with minimal energy consumption.

2026-03-24T00:00:00Z Zavtrak, Daria Khychan, Valentyn Dubanych, Yeva Dobrotvor, Bohdan Herasimchuk, Yaroslav Bessarab, Borys Mandziy, Artem Pastukh, Oleh http://elartu.tntu.edu.ua/handle/lib/54153 2026-10-13T09:32:59Z 2026-03-24T00:00:00Z

Назва: Development of an intellectualized program system based on rag-architecture Автори: Zavtrak, Daria; Khychan, Valentyn; Dubanych, Yeva; Dobrotvor, Bohdan; Herasimchuk, Yaroslav; Bessarab, Borys; Mandziy, Artem; Pastukh, Oleh Короткий огляд (реферат): The article presents an approach in the creation of an intellectualized dialogue system for automation of communication with university applicants during admission campaigns. Retrieval-Augmented Generation (RAG) architecture, which combines search of relevant information with generation of a response using a Large Language Model, is the basis of the development. Fine-tuning of the GPT-2 model with regulatory documentation of a higher educational facility was used to provide support for Ukrainian language. A hybrid mechanism of response generation, which combines fragments extracted from a knowledge base with segments generated by the language model, was proposed. An architecture, which ensures the relevance, accuracy and completeness of data, as well as lowering the workload on university employees, was realized. The quality of the system was rated using both objective (response speed, BERTScore, relevance) and subjective metrics (completeness, convenience, search flexibility), which allowed to record the efficiency of the approach. Presented instrument demonstrates the perspective of the usage of RAG approaches in applied tasks of the educational sphere, especially in support systems for admission committees.

2026-03-24T00:00:00Z http://elartu.tntu.edu.ua/handle/lib/54149 2026-10-13T09:32:26Z 2026-03-24T00:00:00Z

Назва: Content

2026-03-24T00:00:00Z http://elartu.tntu.edu.ua/handle/lib/54148 2026-10-13T09:32:24Z 2026-03-24T00:00:00Z

Назва: Publishing page

2026-03-24T00:00:00Z Zygmuntowicz, Justyna Tańska, Joanna Wiecińska, Paulina Piotrkiewicz, Paulina Konopka, Katarzyna Szafran, Mikołaj Wachowski, Marcin Szymańska, Joanna Kaszuwara, Waldemar http://elartu.tntu.edu.ua/handle/lib/54150 2026-10-13T09:32:34Z 2026-03-24T00:00:00Z

Назва: From ceramic core to metal rich surface: functionally graded Al2O3-Ni composites fabricated by centrifugal gel casting Автори: Zygmuntowicz, Justyna; Tańska, Joanna; Wiecińska, Paulina; Piotrkiewicz, Paulina; Konopka, Katarzyna; Szafran, Mikołaj; Wachowski, Marcin; Szymańska, Joanna; Kaszuwara, Waldemar Короткий огляд (реферат): Functionally graded Al2O3-Ni composites were fabricated by centrifugal gel casting using a suspension with a total solid loading of 55 vol.% and a metallic phase content of 10 vol.% Ni. The applied centrifugal field induced a pronounced radial redistribution of the metallic phase, resulting in a three-zone microstructure consisting of a Ni-rich outer region, a transition zone, and a ceramic-dominated inner region. Archimedesʼ measurements revealed a high relative density of 99.24 ± 0.74%, low open porosity of 3.54 ± 0.52%, and minimal water absorption of 0.79 ± 0.10%, confirming effective densification. Linear shrinkage after sintering at 1400°C in an Ar/H₂ atmosphere was 13.67% in the axial direction and 13.30% in the radial direction, corresponding to a volumetric shrinkage of 35.24%. Quantitative image analysis showed a local nickel volume fraction of up to 23% in the outer zone and approximately 1% in the inner zone. The mean equivalent diameter of Ni particles ranged from 1.77 to 2.08 μm, depending on the radial position. The alumina matrix exhibited a fine-grained microstructure with a mean grain size of 0.43 ± 0.21 μm. EDS analyses confirmed a smooth compositional gradient and chemical stability of the Al2O3-Ni interfaces without secondary phase formation. These results demonstrate that centrifugal gel casting is an effective method for producing dense, chemically stable, and functionally graded ceramic-metal composites with a controlled microstructural architecture.

2026-03-24T00:00:00Z Pankiv, Maria Martsenuk, Yevheniya Fatiuk, Vasyl Gogolyuk, Volodymyr Yushchyshyn, Mykhailo http://elartu.tntu.edu.ua/handle/lib/54147 2026-10-13T09:31:53Z 2026-03-24T00:00:00Z

Назва: Algorithm for developing a mechanical and technological model of cleaning systems for root harvesting machines Автори: Pankiv, Maria; Martsenuk, Yevheniya; Fatiuk, Vasyl; Gogolyuk, Volodymyr; Yushchyshyn, Mykhailo Короткий огляд (реферат): The development and optimization of the parameters of new working bodies and machines generally requires a phased analysis and generalization of existing technologies, methods of harvesting root crops, design features of modern technical means and working bodies, identification of their advantages and disadvantages, creation of a theory of the technological process, development of criteria for optimizing parameters, search for new engineering calculation methods. To describe the processes of functioning of technical systems in most cases, methods of empirical and analytical modeling are used. The purpose of the work is to further search for a methodology for developing mechanical and technological models that describe the functional process of separating impurities from root crops by cleaning transport and technological modules of root harvesting machines. The article presents an algorithm for developing a mechanical and technological model and conducting research on complex dynamic systems that implement step-by-step operations of separating structural components of impurities from root crops.

2026-03-24T00:00:00Z Lytvynenko, Iaroslav Kondratiuk, Andrii http://elartu.tntu.edu.ua/handle/lib/54146 2026-10-13T09:31:52Z 2026-03-24T00:00:00Z

Назва: Mathematical Models of Electrocardiosignals for the Task of Their Simulation, Taking into Account Various Types of Artifacts Автори: Lytvynenko, Iaroslav; Kondratiuk, Andrii Короткий огляд (реферат): This article presents the developed new stochastic mathematical models of the electrocardiosignal, which allow to take into account the randomness and cyclicity of its physical nature and the possibility of taking into account various types of artifacts, which may be due to various reasons (zero drift of the isopotential line, poor contact of the electrodes with the patient's body surface, etc.). The artifacts that allow to take into account mathematical models primarily include those that manifest themselves in a change in the shape of the electrocardiosignal, that is, atypical changes in morphology not associated with signs of pathologies or signs of a normal signal. These atypical changes are taken into account by mathematical models both on cycle segments and on individual segments-zones of the electrocardiosignal. In addition, the developed mathematical models allow to take into account changes in the rhythm of such a cyclic signal by taking it into account in the rhythm function, and therefore, in addition to artifacts that manifest themselves in the morphology of the signal, mathematical models allow to lay down possible artifacts associated with the rhythm during modeling.

2026-03-24T00:00:00Z Peleshchak, Ivan Lytvyn, Vasyl Mykytyn, Mykhailo Peleshchak, Roman http://elartu.tntu.edu.ua/handle/lib/54145 2026-10-13T09:31:57Z 2026-03-24T00:00:00Z

Назва: Recognition of Low-Probability-of-Intercept Radar Signals Based on a Hybrid CNN-MLP Model Автори: Peleshchak, Ivan; Lytvyn, Vasyl; Mykytyn, Mykhailo; Peleshchak, Roman Короткий огляд (реферат): This paper proposes an intelligent recognition system for low-probability-of-intercept (LPI) radar signals based on a hybrid neural network model that combines a complex-valued convolutional neural network (Complex 1D- CNN) for processing in-phase and quadrature (IQ) components with a multilayer perceptron (MLP) for extracting parametric signal features. Unlike conventional approaches that rely on time-frequency transforms such as the short- time Fourier transform (STFT) and Choi–Williams distribution (CWD), the proposed model operates directly on complex-valued data while preserving the phase structure of the signal. To improve robustness under noisy conditions, a Hankel Cross-Attention mechanism and SNR-aware loss weighting are employed. Experiments conducted on the RadChar Baseline dataset (5 classes) achieved an accuracy of 90.0% and a macro F1-score of 0.90, outperforming single-branch CNN models and demonstrating stable performance at SNR levels down to -12 dB. The obtained results confirm the effectiveness of the proposed integrated approach for LPI radar signal recognition in noisy environments.

2026-03-24T00:00:00Z Polishchuk, Volodymyr Sehlianyk, Vasyl http://elartu.tntu.edu.ua/handle/lib/54144 2026-10-13T09:31:51Z 2026-03-24T00:00:00Z

Назва: A fuzzy framework for assessing the level of cognitive and operational readiness of regional citizens to ensure their own digital security Автори: Polishchuk, Volodymyr; Sehlianyk, Vasyl Короткий огляд (реферат): Citizens’ growing involvement in the digital environment increases exposure to cyber risks caused by the human factor. However, existing assessment approaches mainly focus on technical cybersecurity capacity or general digital literacy and do not comprehensively capture both cognitive awareness and the ability to make correct decisions in typical cyber situations. The purpose of the study is to develop and verify a fuzzy framework for assessing the level of cognitive and operational readiness of citizens of a region to ensure their own digital security. The information base was formed using a questionnaire survey of citizens and two information methods: self-assessment of cognitive cybersecurity awareness on a ten-point scale and assessment of applied cyberliteracy through single-answer test questions. An integral assessment was obtained using a fuzzy model with multidimensional membership functions and a fuzzy rule base. The proposed framework was tested on real data from 315 respondents in the Transcarpathian region collected during March–June 2025. The resulting integral indicator of cognitive and operational readiness was 0.67, which corresponds to a stable average level of population readiness to ensure personal digital security. The proposed framework provides a comprehensive, reproducible, and scalable assessment of citizens’ readiness for digital security and can be used to identify high- risk groups and support educational, preventive, and managerial decision-making at regional and national levels.

2026-03-24T00:00:00Z Levytska, Tetiana Kotykhova, Liudmyla http://elartu.tntu.edu.ua/handle/lib/54143 2026-10-13T09:31:50Z 2026-03-24T00:00:00Z

Назва: Modeling of topological relationships between trends of social platforms X and YouTube for short-term forecasting using Telegram interface Автори: Levytska, Tetiana; Kotykhova, Liudmyla Короткий огляд (реферат): The article presents the results of the development and research of an intelligent system designed for monitoring and forecasting the popularity dynamics of hashtags and topics across social media platforms (X/Twitter, YouTube). The relevance of this study is driven by the rapid update rate of information flows, which necessitates automated tools for identifying emerging trends in real-time. The scientific novelty of the work lies in the application of Graph Neural Networks (GNN) to analyze non-linear relationships between social media objects, allowing for the integration of both temporal dynamics and the topological structure of topic interactions. The paper provides a detailed description of the system's modular architecture. The data acquisition module is implemented through a hybrid approach: utilizing the official YouTube Data API for video content analysis and web scraping mechanisms (BeautifulSoup) to retrieve hourly Twitter trend data via the trends24.in platform. A relational SQLite database is employed to store structured information and ensure rapid access to time series data. Special attention is paid to the data preprocessing stage, which includes the normalization of popularity metrics and the formation of a graph structure where hashtags serve as nodes and edges represent their co-occurrence within a single context. The mathematical foundation of the system is based on the Graph Convolutional Network (GCN) architecture. The study justifies the selection of GCNConv layers, which implement a feature aggregation mechanism from neighboring nodes, and the Adam adaptive optimizer, ensuring efficient model training on sparse data. In the experimental section, a comparative analysis was conducted between the developed GNN model and classical approaches (Linear Regression, RNN), as well as alternative graph-based methods (GAT, Node2Vec). Testing results using MSE and RMSE metrics confirmed the superior predictive accuracy of the GNN in short-term popularity forecasting tasks. The practical significance of the work is validated by the implementation of a user interface in the form of a Telegram bot, providing analytics visualization via the Matplotlib library.

2026-03-24T00:00:00Z Kuz, Mykola Bezghachniuk, Yaroslav Horodenko, Taras Nezamai, Borys Oliinyk, Andrii http://elartu.tntu.edu.ua/handle/lib/54142 2026-10-13T09:31:48Z 2026-03-24T00:00:00Z

Назва: Methods for quality assessment of standardized software time indicators Автори: Kuz, Mykola; Bezghachniuk, Yaroslav; Horodenko, Taras; Nezamai, Borys; Oliinyk, Andrii Короткий огляд (реферат): ime parameters of software quality indicators are among the most important when assessing the quality of software products, as they determine performance, stability and resource utilization efficiency. In the article time indicators of software product quality are researched in accordance with international standards ISO/IEC 25022 and ISO/IEC 25023. These standards provide a list of software quality indicators, but do not contain any methods or techniques for determining them. In particular, there are no any measurement techniques for time indicators of software quality. The purpose of this research is study and systematize time indicators of the software products quality and develop methods for their classification and evaluation on a time scale. The feasibility of forming a clear classification of time metrics is substantiated, which covers different time scales – from immediate system reactions to long-term effects of exploitation. The method of structuring indicators into four time ranges (seconds, minutes/hours, days, months), which provides a complex assessment of performance, reliability and stability of software products. An application has been developed that implements the measurement of basic time indicators, in particular, mean response time, median, 95- percentile and dispersion, based on multiple HTTP requests using high-precision timer. The experiment with SLA threshold equals to 150 ms confirms a practical efficiency of the proposed model and it eligibility to industry standards. The obtained results show high performance and stability of the system, that indicates research theoretical statements is relevant. The research emphasizes, that time indicators are a universal indicator of software quality, providing a basis for standardized performance assessment for different types of information system.

2026-03-24T00:00:00Z Pidgurskyi, Mykola Pidgurskyi, Ivan Bykiv, Denys Liubovitskyi, Danylo Rudyak, Yurii http://elartu.tntu.edu.ua/handle/lib/54141 2026-10-13T09:31:54Z 2026-03-24T00:00:00Z

Назва: Analysis of the Stress-Strain State of Steel Solid-Web and Perforated I-Beams Used in Pitched Roof Structures Автори: Pidgurskyi, Mykola; Pidgurskyi, Ivan; Bykiv, Denys; Liubovitskyi, Danylo; Rudyak, Yurii Короткий огляд (реферат): The paper presents a numerical investigation of the stress-strain state of steel solid-web and perforated I- beams in pitched roof systems using the finite element method (FEM) implemented in the ANSYS software environment. Single-pitch and double-pitch beams configurations were analysed under different boundary conditions (hinged and fixed supports at both ends) and roof inclinations varying from 0° to 45°, typical for industrial buildings. The principal parameters of the stress-strain state were analysed, namely deflections and equivalent (von Mises) stresses along the beam flanges, as well as equivalent stresses around the web openings. The results show that the largest deflections occur in hinged beams, while fixed significantly reduces them. For most configurations, maximum deflections are located at mid-span; however, in rigidly fixed double-pitched beams, they shift toward the quarter span. Perforated beams exhibit higher stiffness compared to solid counterparts. The distribution of equivalent stresses in perforated beams is non- uniform due to the presence of openings and local stress concentrations, which necessitated evaluation based on averaged values. Fixed beams, particularly double-pitched ones, demonstrate substantially lower average stress levels in flanges than hinged systems. Maximum stresses in perforated beams occur around end openings and generally decrease with increasing slope, with the most pronounced reduction observed in rigidly fixed double-pitched beams.

2026-03-24T00:00:00Z http://elartu.tntu.edu.ua/handle/lib/54140 2026-10-13T09:31:55Z 2026-03-24T00:00:00Z

Назва: Title

2026-03-24T00:00:00Z