Browsing by Author "Nyemkova, Elena"
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Item Graphic computer technologies in 3D modeling of special technical equipment(Видавництво Львівської політехніки, 2022-02-22) Liaskovska, Solomiya; Nyemkova, Elena; Martyn, Evgen; Lakh, Yuriy; Lviv Polytechnic National University; Lviv State University of Life SafetyThe involvement of computer graphics technology is need for the training of specialists in engineering specialties. The concept of the necessary software has been developed, as well as current technical issues have been addressed, in particular, the choice of engine for working with computer graphics. The influence of the main factors on the parameters of rescue equipment is considered, including fire trucks. Special software is given as an example and the work of the developed software is described. Based on the analysis of the model, there can be establish the characteristic data that determine the stability of the rescue vehicle. The developed mocaps of the mobile application allow the analysis of the operation of special equipment.Item Invariants of noise in cyber-physical systems components(Lviv Politechnic Publishing House, 2017-12-03) Nyemkova, Elena; Lviv Polytechnic National UniversityThe article is devoted to the invariant of internal electrical noise of electronic devices, which are components of cyber-physical systems. Time series of noise signals show chaotic behavior. Invariants are based on the autocorrelation function of dynamic time series. Insignificant differences on the micro-level devices lead to changes in the dynamics of time series. It is shown that the form of the autocorrelation function is unchanged for each electronic device of the cyber-physical system. The dynamic authentication algorithm has been developed, which consists of choosing a range of time series, defining and calculating invariants, making decisions about authentication. The result of the operation of the algorithm can be transferred to the executive mechanism, depending on the practical problems in cyber-physical systems. Also for the pseudorandom sequence of the embedded program generator, the following values are predicted on the basis of invariants. Estimated errors are calculated.Item Дослідження фазових портретів шуму електронних пристроїв(Видавництво Львівської політехніки, 2016) Nyemkova, Elena; Shandra, ZenoviyЕкспериментально досліджено шуми електронних приладів для їх динамічної ідентифікації. Проведено моделювання фазових траєкторій за допомогою осциляторної моделі. Аналіз часових змін амплітуди шумів підтвердив їх фрактальну природу. Параметри фазових портретів спектральних компонент шуму дають можливість автенти- фікації електронних приладів. Експериментально зафіксований ефект формування часових структур у спектрі шумів. The article deals with the experimental studies of noise for dynamic identification of electronic devices. The simulation of phase trajectory was carried out using the oscillator model. Analysis of the noise temporal characteristics confirms their fractal nature. Parameters of phase portraits of spectral noise components enable us to conduct the electronic devices authentication. Experimental studies have shown that there is the effect of temporary structures formation in the behavior of the noise spectrum.