Інституційний репозитарій Вінницького національного технічного університету

Ласкаво просимо в інституційний репозитарій Вінницького національного технічного університету, який накопичує, зберігає, розповсюджує та забезпечує довготривалий, постійний та надійний доступ до наукових робіт професорсько-викладацького складу, співробітників, студентів, аспірантів і докторантів ВНТУ.

ISSN 2413-6360

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Нові надходження

Інтеграція страхового менеджменту в систему управління професійними ризиками підприємства в умовах цифрової трансформації
Віштак, І. В.
;
Пищикова, А. О.
;
Філяс, О. Ю.
;
Vishtak, I. V.
;
Pyshchykova, A. O.
;
Filias O. Yu.
(Лібуркіна Л. М., 2026)
The aim of the article is to substantiate the role of insurance management as a tool for compensating the professional risks of an enterprise and to define its functional capabilities within the risk management system in conditions of economic instability and digital transformation of the business environment. In the research process, a system approach was used – to determine the place of insurance management in the structure of professional risk management; the method of logical-structural analysis – to identify the specifics of professional risks; comparative analysis – to evaluate state and voluntary compensation mechanisms; generalization of scientific sources and statistical data – to define the functional role of insurance management; elements of conceptual modeling – to substantiate the integration of insurance management into the corporate risk management system. The article identifies the specifics of professional risks as a dynamic management object. It analyzes the mechanisms for their compensation based on State social insurance and voluntary insurance programs. The functional role of insurance management in ensuring the financial stability of the enterprise and the social protection of personnel is defined. The feasibility of integrating insurance management into the corporate risk management system is substantiated. The directions of its development under the conditions of the digitalization of Ukraine’s economy are outlined. The scientific novelty of the study lies in: substantiating insurance management not only as a compensatory mechanism but also as an integrated tool for managing the enterprise’s professional risks; determining its functional role in ensuring the financial stability and continuity of business activities; developing an approach to integrating insurance management into the corporate risk management system under the conditions of the transformation of the risk environment; formation of a conceptual vision for the development of insurance management as an element of the digital architecture of risk management. The practical significance of the obtained results lies in the possibility of: using insurance management as a tool to increase enterprise resilience; improving the system of professional risk compensation; optimizing the distribution of risks between the State, insurers, and business; integrating insurance mechanisms into corporate risk management systems; applying digital tools to increase the efficiency of professional risk management.
Захист конфіденційних ділянок цифрових зображень засобами вибіркового шифрування
Maidaniuk, V. P.
;
Nechyporuk, M. L.
(Національний університет «Львівська політехніка», 2026)
A selective encryption workflow for confidential regions of digital images is proposed. Sensitive pixel data are stored in an authenticated encrypted container, while a redacted preview remains publicly accessible. Region coordinates and preview identity are authenticated to prevent substitution and incorrect reconstruction.
Багатоканальний аналого-цифровий перетворювач паралельного типу з коригуванням зміщення опорної напруги та коефіцієнта підсилення
Бортник, Г. Г.
;
Бортник, О. Г.
;
Чубатюк, С. В.
;
Bortnyk, G.
;
Bortnyk, О.
;
Chubatiuk, S.
(Хмельницький національний університет, 2026)
The paper presents a method for expanding the dynamic range of multichannel analog-to-digital converters (ADC) of parallel type. It is indicated that the analog-to-digital conversion method, which is based on the multichannel architecture of the parallel ADC, allows improving the frequency characteristics of radio engineering systems with digital processing of radio signals. The qualitative indicators of multichannel ADC will depend on the identity of the ADC parameters in each of the conversion channels. The non-identity of the ADC reference voltage offset values is associated with the spread of the parameters of the built-in operational amplifiers and comparators and the asymmetry of the ADC conversion stages. The non-identity of the gain coefficients in the ADC channels is due to the parasitic capacitances and inductances of the operational amplifiers, as well as the differences in the input parameters of analog comparators. To find the offset value of the reference voltage, it is necessary to choose the reference voltage of one of the ADC channels as an example. Then the averaged root mean square deviation of the digital signal from the outputs of the parallel ADCs relative to the exemplary ADC will determine the offset of the reference voltage value. The difference in the gain coefficients of the parallel ADCs can be found in a similar way, except that instead of the deviation of the digital signal, it is necessary to determine the modulus of this signal at the output of each ADC channel. It is proposed to adjust the gain coefficients and reference voltage offsets of individual ADC channels. A structural diagram of a multichannel parallel ADC with adjustment of the gain coefficients and reference voltage offsets of individual ADC channels has been developed. An analysis of the effectiveness of the developed method confirmed that the proposed method allows to expand the dynamic range of the ADC by 12 - 15 dB depending on the frequency value of the ADC input signal. The proposed multi-channel parallel ADC can be used in modern digital radio engineering systems.
Вибір режиму зміни швидкості деформації при високотемпературному торцьовому осадженні заготовок циліндричної форми
Mykhalevych, V. M.
;
Kolisnyk, M. A.
;
Dymnich, I. V.
(Вінницький національний аграрний університет, 2026)
The paper considers the problem of ing a rational mode of strain rate change during high-temperature isothermal flat-die upsetting of cylindrical billets. The object of the study is the hot upsetting process; the subject is the law of strain rate change at the critical point of the billet and the corresponding law of motion of the deforming tool. The relevance of the work stems the fact that upsetting is one of the most energy-intensive forging operations, while the tool speed is in practice assigned as a constant value based on equipment capabilities rather than on conditions for the fullest use of the plastic capacity of the material. Known results on the optimization of the rate mode of multistage hot deformation have been obtained for processes with a homogeneous stress-strain state, for which the stress triaxiality ratio remains unchanged. During flat-die upsetting this ratio at the critical point on the equator of the lateral surface changes during the process due to barrelling, which formally makes the direct transfer of known results impossible. To overcome this obstacle, a hypothesis is formulated on the weak dependence of the limiting strain on the stress triaxiality ratio during high-temperature deformation for a certain class of materials. It is shown that a weakened form of the hypothesis is sufficient for a correct transfer of the results, requiring independence the triaxiality ratio only for the strain rate sensitivity exponent. It is established that the resource dependence parameter enters exclusively into the scale factor of the solution and does not affect the shape of the optimal trajectory, while the relative error of the limiting strain is smaller than the relative error of this parameter. The problem of matching the optimal law of strain rate change with the tool kinematics is solved. A closed-form analytical expression for the tool speed is obtained, which does not require numerical inversion of the dependence of strain intensity on the upsetting ratio. For exponential and polynomial trajectories the law of tool motion is presented in explicit form. An estimate of the strain rate deviation within a stage is proposed, which gives the number of stages a specific technological meaning. A numerical calculation for 14Kh17N2 steel at 1150 °C established that the plastic resource of the material is not exhausted during flat-die upsetting, i.e. the process is limited geometrically rather than by deformation. For such materials the problem of minimizing the process time is meaningful. A relation is obtained linking the reduction of deformation time with the increase of the limiting strain; it is shown that an increase of the limiting strain by 5.9 % corresponds to a reduction of the upsetting time by 47 %. The conditions for applicability of the obtained results to processes of local deformation by roller burnishing are determined.
Адаптивне згладжування контурів графічних зображень у видавничих системах
Романюк, О. Н.
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Майданюк, В. П.
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Дембіцький, О. М.
;
Romanyuk, O. N.
;
Maidaniuk, V. P.
;
Dembitskyi, O. V.
(Національний університет «Львівська політехніка», 2026)
An adaptive approach to contour antialiasing in publishing systems is proposed. It combines edge classification, selective supersampling and coverage-based colour blending. The approach targets diagrams, illustrations and thin strokes while preserving fine details. A validation procedure is outlined for screen display and print-oriented rasterisation.