Wyniki wyszukiwania - Biblioteka Nauki

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Matrix Mittag‑Leffler function in fractional systems and its computation

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Matychyn I. , Onyshchenko V.

Bulletin of the Polish Academy of Sciences. Technical Sciences

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2018

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tom Vol. 66, nr 4

495--500

EN

Matrix Mittag‑Leffler functions play a key role in numerous applications related to systems with fractional dynamics. That is why the methods for computing the matrix Mittag‑Leffler function are so important. The matrix Mittag‑Leffler function is a generalization of matrix exponential function. This implies that some of numerous existing methods for computing the matrix exponential can be adapted for matrix Mittag‑Leffler functions as well. Unfortunately, the technique of scaling and squaring, widely used in computing of the matrix exponential, cannot be applied to matrix Mittag‑Leffler functions, as the latter do not possess the semigroup property. Here we describe a method of computing the matrix Mittag‑Leffler function based on the Jordan canonical form representation. This method is implemented with Matlab code [1].

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Matrix Mittag‑Leffler function in fractional systems and its computation

100%

Matychyn I. , Onyshchenko V.

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Photocarrier transport in 2D macroporous silicon structures

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Karachevtseva L. , Onyshchenko V. , Sachenko A.

Opto-Electronics Review

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2010

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tom Vol. 18, No. 4

394-399

EN

The mechanisms of photocarrier transport through a barrier in the surface space-charge region (SCR) of 2D macroporous silicon structures have been studied at photon energies comparable to that of the silicon indirect band-to-band transition. It was found that the photoconductivity relaxation time was determined by the light modulation of barrier on the macropore surface; as a result, the relaxation itself obeyed the logarithmic law. The temperature dependence of the photoconductivity relaxation time was determined by the thermionic emission mechanism of the current transport in the SCR at temperatures T > 180 K, and by the tunnel current flow at T < 100 K, with temperature-independent tunnelling probability. The photo-emf was found to become saturated or reverse its sign to negative at temperatures below 130 K because of light absorption due to optical transitions via surface electronic states close to the silicon conduction band. In this case, the surface band bending increases due to the growth of a negative charge of the semiconductor surface. The equilibrium electrons in the bulk and photoexcited holes on the macropore surface recombine through the channel of multistage tunnel recombination between the conduction and valence bands.

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Implementation of flat slab column reinforced concrete frames in low cost housing construction

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Onyshchenko V. , Pavlikov A. , Mykytenko S.

Inżynieria Bezpieczeństwa Obiektów Antropogenicznych

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2016

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tom Nr 3

29--33

EN

In research presents an analysis of flat slab column reinforced concrete frames in low cost housing construction. The features of precast flat slab column conduit within reinforced concrete frame building have been analyzed. The problems in designing flat slab column frame to improve its reliability are under consideration. Suggestions concerning the ways of improving flat slab column frame building calculations are presented. Precast flat slab column frame constructive system is promising for construction of residential and public buildings. In order to reduce the values of bending moments in the joints of columns, it is suggested to apply solid diaphragms with the functions of taking up the vertical loads in order to take up horizontal loads. It seems reasonable to define the required amount of reinforcement bars in plates by means of the kinematic limit equilibrium method.

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Improvement of fidelity of moving objects classification in guard signaling complexes with seismic sensors

70%

Volochiy B. , Zmysnyi M. , Ozirkovskyy L. , Onyshchenko V. , Salnyk Y.

Informatyka, Automatyka, Pomiary w Gospodarce i Ochronie Środowiska

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2018

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tom T. 8, nr 4

36--39

EN

The effectiveness of guard signaling complexes (GSC), when there is an important validity of the classification of moving objects (MO), is evaluated by the following indexes: probability of GSC task execution; probability of partial fulfillment of the task; probability of user’s “deception”. Accordingly, the performance indicators of the GSC, in turn, depend on the indexes of the functionality of its constituents: probability of fixation of moving object by seismic sensor, probability of correct classification of MO type and probability of receiving radio signal by the system of receiving and displaying information (SRDI). The article describes a discrete-continuous stochastic model of of GSC reaction to moving object crossing control zone, in which three seismic sensors are installed. Majority principle of identifying the type of moving object was used on the receiving part of the complex. A comparative analysis of the effectiveness of guard signaling complexes using one, two and three sensors in control zone are carried out.

PL

Skuteczność systemów alarmowych, w przypadkach, gdy ważna jest dokładność klasyfikacji poruszających się obiektów, ocenia się za pomocą następujących wskaźników: prawdopodobieństwo wykonania zadania; prawdopodobieństwo częściowej realizacji zadania; prawdopodobieństwo "oszukiwania" użytkownika. W związku z tym, wskaźniki jakości działania systemów alarmowych zależą od wskaźników funkcjonalności ich komponentów: prawdopodobieństwa ustalenia poruszającego się obiektu za pomocą czujnika sejsmicznego, prawdopodobieństwa poprawnej klasyfikacji rodzaju poruszającego się obiektu oraz prawdopodobieństwa odbioru sygnałów radiowych przez system odbioru i wyświetlania informacji. Artykuł przedstawia dyskretno-ciągły model stochastyczny reakcji systemu alarmowego na przekroczenie strefy kontrolnej przez poruszający się obiekt, w której zainstalowane są trzy czujniki sejsmiczne. Identyfikacja poruszającego się obiektu odbywa się na wyjściu systemu na podstawie zasady większości. Porównano skuteczności systemów alarmowych z wykorzystaniem jednego, dwóch i trzech czujników sejsmicznych w strefie kontrolnej.