Вісники та науково-технічні збірники, журнали
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Item Learning Interferometric Equipment through Integration of Game Methods into Mobile Application(Видавництво Львівської політехніки, 2023-02-28) Яцишин, Святослав; Назаркевич, Ігор; Yatsyshyn, Svyatoslav; Nazarkevych, Ihor; Національний університет “Львівська політехніка”; Lviv Polytechnic National UniversityСтаття присвячена вивченню та розробці мобільного застосунку для базового та поглибленого вивчення інтерферометричного обладнання. Основуючись на сучасних підходах до освіти та актуальних потребах студентів, досліджено особливості роботи з високоточним інтерферометричним обладнанням. В статті розглядаються проблеми, пов'язані з вивченням інтерферометрії як дисципліни: складність розуміння термінології, унікальність прикладної бази та обмежена кількість студентів. Для вирішення цих проблем пропонується залучення ігрових методів навчання, що дозволяє зробити процес більш занурюючим та ефективним. Застосунок, розроблений на базі платформи Unity, має на меті зробити вивчення доступним, цікавим та ефективним, комбінуючи теоретичні знання з практичними завданнями та ігровими елементами.Item Design of the water strider-like robot(Видавництво Львівської політехніки, 2023-02-28) Yatsyshyn, Svyatoslav; Zeng, Xinyu; Lviv Polytechnic National UniversityThe development of the human population produces ecosystem changes. Monitoring of them can be considered one of the key prerequisites for ensuring its survival. At the same time, the development of Metrology 4.0 based on the study of land massifs and the control of their characteristics should consider the methods and means for studying the aquatic environment by new types of robots, as platforms for deployment of some sensors, namely multi-legged walking devices, for example, the “water striders”. In the paper, we consider the possibility of solving the quite complex task of designing of light robot designed to slide on the surface of the water without submerging in it and equipped with built-in sensors.Item RSA algorithm in fractional-rational n-ary forms while encryption-decryption of monochrome images(Видавництво Львівської політехніки, 2022-02-28) Kovalchuk, Anatoliy; Kustra, Nataliia; Yatsyshyn, Svyatoslav; Lviv Polytechnic National UniversityThe basis for image protection is the assumption that the image is a stochastic signal. But the image is a specific signal that possesses, in addition to typical informativeness (informativeness of data), also visual informativeness, which brings new challenges to the issue of protection. Therefore, the urgent task is to implement such application of the RSA algorithm that when encrypting an image: the cryptographic stability of the RSA algorithm did not deteriorate; achieves full image noise to prevent the use of visual image processing methods. An algorithm for encryption-decryption of monochrome images in fractional-rational forms of order n using the elements of the RSA algorithm is proposed, as the most resistant to unauthorized decryption of signals. The proposed algorithm is applied to images with strictly separated contours. Elements of the RSA algorithm are applied to construct the coefficients of fractional-rational affine transformations. The developed algorithm is inherent in the higher cryptographic stability compared to the ordinary RSA algorithm. The possibilities of using the elements of the RSA algorithm in affine transformations while encrypting and decrypting images are described. The results of encryption modeling for cryptographic transformations of monochrome images of a given dimension are given. Modified models and algorithmic procedures of key formation processes, direct and inverse cryptographic transformations, reduced to mathematical element-by-element operations, have been developed.Item Electrical properties of Ti-Cu-Co-Si high-entropy alloy(Видавництво Львівської політехніки, 2022-02-28) Yatsyshyn, Svyatoslav; Skoropad, Pylyp; Karpinski, Mikolaj; Lviv Polytechnic National UniversityTo study the metrological characteristics, there were studied manufactured based on the Ti-Cu-Co-Si alloy, obtained by quenching from the melt, the sensitive element of the resistance thermotransducer. The instability of its metrological characteristics as a function of temperature up to 350 oC and operation time up to 3000 hours was investigated; it does not exceed 0.025 % under the worst operating conditions. In addition, the methodological error of measurement caused by heating of the sensitive element by the measuring current was examined. It was shown that the recorded changes in electrical resistance were outside the value of the methodological error. They may be due to the presence of nanostructured fields of mechanical stresses and the formation of nanoprecipitates as a consequence of manufacturing.Item Radio frequency identification in cyber-physical systems(Видавництво Львівської політехніки, 2021-02-23) Mašková, Kamila; Petrovska, Iryna; Ryshkovskyy, Oleksander; Yatsyshyn, Svyatoslav; Lviv Polytechnic National UniversityAutomated systems that are part of cyber-physical systems provide distribution of goods or prefabricated components, as well as their documenting and automatic tracking in real-time. Workpieces are marked with RFID transponders. RFID antennas allow contactless reading and/or recording of information, RFID electronics process and transmit it to the programmable logic controller via PROFIBUS DP, PROFINET, Ethernet IP, Ethernet TCP/IP, or EtherCAT interface. The peculiarities of the universal interface for the needs of cyber-physical systems equipped with RFID means and the main metrological characteristics of the latter are studied in the work.Item Parallelization of RSA cryptographic algorithm based on CUDA technologies(Видавництво Львівської політехніки, 2021-02-23) Mochurad, Lesia; Kryvenchuk, Yuriy; Yatsyshyn, Svyatoslav; Lviv Polytechnic National UniversityThe paper examines the efficiency of the application of CUDA technologies for the parallelization of the cryptographic algorithm with the public key. The speed of execution of several implementations of the algorithm is compared: sequential implementation on the CPU and two parallel implementations – on the CPU and GPU. A description of the public key algorithm is presented, as well as properties that allow it to be parallelized. The advantages and disadvantages of parallel implementations are analyzed. It is shown that each of them can be suitable for different scenarios. The software was developed and several numerical experiments were performed. The reliability of the obtained results of encryption and decryption is confirmed. To eliminate the influence of external factors at the time of execution the algorithm was tested ten times in a row and the average value was calculated. Acceleration coefficients for message encryption and decryption algorithms were estimated based on OpenMP and CUDA technology. The proposed approach focuses on the possibility of further optimization through the prospects of developing a multi-core architecture of computer systems and graphic processors.Item Thermometry: from sensitive material to thermoelectric thermotransducer(Видавництво Львівської політехніки, 2005-02-24) Stadnyk, Bohdan; Skoropad, Pylyp; Yatsyshyn, Svyatoslav; Lviv Polytechnic National UniversityThe hard operation conditions of temperature thermotransducers which involve their thermal cycling require special attention to the study of processes occurring in structural elements, in particular in thermometric materials. Operation impacts cause the drift of thermometric characteristics due to the influence of the few factors main of which seem to be the thermo structural stresses. Therefore, different kinds of sensitive elements were studied. Since traditional polycrystalline thermoelectrodes of thermocouples are inherent in the well-known drawback linked with recrystallization, there were investigated the liquid metals as the thermometric substances, melts, single-crystal materials, and metallic glasses. The need for metal glasses application in thermometry is substantiated, which allows eliminating thermally activated gradients of internal stresses in thermocouples ensuring high reproducibility and low drift of their thermo-EMF comparing to traditional materials. The analysis of sources of the instability of thermocouples’ drift is carried out. It demonstrates the density of heat and electric flows in stressed thermoelectrodes depends not only on temperature and electric potential gradient but also on the stresses’ gradient. This causes the dependence of thermometric parameters of both poly- and single-crystal substance of thermoelectrodes on the value and nature of stresses occurring within the operation cycle.Item Metrological support of gamma-ray measurements in Ukraine(Видавництво Львівської політехніки, 2020-02-24) Yatsyshyn, Svyatoslav; Lazarenko, Sergii; Lazarenko, Nadiya; Lviv Polytechnic National UniversityThe specific of metrological support for different types of dosemeters are considered. Gamma-ray sensors are commonly used for measuring radiation doses as also the fluid levels in the industry. Typically, the 60Co or 137Cs isotopes as the radiation source are applied. For instance, in the USA, such detectors are beginning to be used as part of the Container Security Initiative [1]. Problems of their metrological assurance are becoming more general. They require the development of metrological support. There are conducted researches of calibration, metrological verification, and determination of the sensitivity of gammaray dosemeters, based on the joint application of installations equipped with ionizing radiation sources and of X-ray installations. The implementation of the Program of Integration of Ukraine into the European Union requires harmonization of Ukrainian and International standards, in the field of metrological assurance of means for measuring the characteristics of ionizing radiation including. Recently, several regulatory, methodological documents and issues have been published. They concern the dosimetric measurement of gamma-ray characteristics in the field of radiation safety, diagnostics, and therapy.Item Optoelectronic quartz sensor of force and pressure(Видавництво Львівської політехніки, 2020-02-24) Rak, Volodymyr; Yatsyshyn, Svyatoslav; Baitsar, Roman; Lviv Polytechnic National UniversitySensors with a frequency output signal are marked as particularly high accuracy, it is easy to switch, and signals may be transmitted over long distances. The main element of such sensors is an electromechanical oscillator connected to the feedback of the autogenerator. String metal oscillators do not provide the required measurement accuracy due to unsatisfactory elasticity, hysteresis, relaxation, and drift of characterisrics. The creation of oscillators made of quartz and silicon due to the perfection of these materials, is difficult. Tere exist the technological problems and problems of conjugation of temperature coefficients of materials expansion. It is proposed a quartz sensor without an oscillator, made from the quartz and equipped by optoelectronic means.Item Поверхнева температурна діагностика зародження мікротріщин у напружено-деформованих металах(Видавництво Львівської політехніки, 2019-02-28) Прохоренко, С. В.; Яцишин, С. П.; Габльовська, Н. Я.; Кононенко, М. А.; Prohorenko, Serhii; Yatsyshyn, Svyatoslav; Hablovska, Nadiia; Kononenko, Maryna; Національний університет “Львівська політехніка”; Івано-Франківський національний технічний університет нафти і газу; Lviv Polytechnic National University; Ivano-Frankivskyi National Technical University of Oil and GasПроаналізовано результати теоретичних досліджень про відповідність числового значення критичної густини внутрішньої енергії значенню ентальпії плавлення та структурно-енергетичну аналогію між процесами механічного руйнування і плавлення. Фізичну картину поширення температурного поля, утвореного у момент зародження дефекту, розглянуто за припущення попередньо бездефектного досліджуваного об’єкта та того, що перерозподіл температури в об’ємі та на поверхні відбувається рівномірно. Здійснено аналітично-числове опрацювання надходження фронту теплової хвилі, яку створює елементарний дефект, який зростає, залежно від глибини його залягання. Отримані результати експериментальних досліджень за допомогою створеної системи контролю дали змогу наблизитись до прогнозування глибини залягання мікродефекту, що виникає внаслідок пластичної деформації. Виконані розрахунки опрацьовано та практично апробовано з розрахунку на подальше використання із системою зовнішнього імпульсного безконтактного контрольованого конвекційного енергетичного збурення.