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Wyświetlanie 1-8 z 8
Tytuł:
Solution of the Stieltjes truncated matrix moment problem
Autorzy:
Adamyan, V.M.
Tkachenko, I.M.
Powiązania:
https://bibliotekanauki.pl/articles/255081.pdf
Data publikacji:
2005
Wydawca:
Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Wydawnictwo AGH
Tematy:
Stieltjes power moments
canonical solutions
Nevanlinna's formula
matrix
Opis:
The truncated Stieltjes matrix moment problem consisting in the description of all matrix distributions sigma(t) on [0, infin) with given first 2n + 1 power moments (Cj)nj=0 is solved using known results on the corresponding Hamburger problem for which sigma(t) are defined on (-infin, infin). The criterion of solvability of the Stieltjes problem is given and all its solutions in the non-degenerate case are described by selection of the appropriate solutions among those of the Hamburger problem for the same set of moments. The results on extensions of non-negative operators are used and a purely algebraic algorithm for the solution of both Hamburger and Stieltjes problems is proposed.
Źródło:
Opuscula Mathematica; 2005, 25, 1; 5-24
1232-9274
2300-6919
Pojawia się w:
Opuscula Mathematica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Motion control system of autonomous mobile robot
System sterowania ruchem autonomicznego robota mobilnego
Autorzy:
Tsmots, I.
Vavruk, I.
Tkachenko, R.
Powiązania:
https://bibliotekanauki.pl/articles/407642.pdf
Data publikacji:
2014
Wydawca:
Politechnika Lubelska. Wydawnictwo Politechniki Lubelskiej
Tematy:
robot mobilny
system sterowania ruchem
logika rozmyta
regresja liniowa
mobile robot
motion control system
fuzzy logic
linear regression
Opis:
In this article the motion control system of autonomous mobile robot is described. Four motion modes: motion mode “to the target”, motion mode “obstacles avoidance”, motion mode “along the right wall” and motion mode “along the left wall” are implemented. A method for determining the effective rotation angle of mobile robot which is a linear combination of rotation angles which are obtained in different motion modes and activation coefficients is proposed. Fuzzy-oriented method with high accuracy and performance is used for motion modes implementation and for finding values of activation coefficients.
W artykule opisano system sterowania ruchem autonomicznego robota mobilnego. Zaimplementowano cztery tryby ruchu: „do celu”, „unikanie przeszkód”, „wzdłuż prawej ściany” oraz „wzdłuż lewej ściany”. Zaproponowano metodę do określania efektywnego kąta obrotu robota, która jest liniową kombinacją kąta obrotu, który jest otrzymywany dla różnych trybów ruchu oraz współczynników aktywacji. Do implementacji trybów pracy oraz znalezienia wartości współczynników aktywacji użyto metodę rozmytą o dużej dokładności i wydajności.
Źródło:
Informatyka, Automatyka, Pomiary w Gospodarce i Ochronie Środowiska; 2014, 4; 89-93
2083-0157
2391-6761
Pojawia się w:
Informatyka, Automatyka, Pomiary w Gospodarce i Ochronie Środowiska
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Ensemble-based Method of Fraud Detection at Self-checkouts in Retail
Autorzy:
Vitynskyi, P.
Tkachenko, R.
Izonin, I.
Powiązania:
https://bibliotekanauki.pl/articles/410756.pdf
Data publikacji:
2019
Wydawca:
Polska Akademia Nauk. Oddział w Lublinie PAN
Tematy:
classification
Ensemble-based method
Random Forest
fraud detection
retail
Ito decomposition
imbalanced dataset
Opis:
The authors consider the problem of fraud detection at self-checkouts in retail in condition of unbalanced data set. A new ensemble-based method is proposed for its effective solution. The developed method involves two main steps: application of the preprocessing procedures and the Random Forest algorithm. The step-by-step implementation of the preprocessing stage involves the sequential execution of such procedures over the input data: scaling by maximal element in a column with row-wise scaling by Euclidean norm, weighting by correlation and applying polynomial extension. For polynomial extension Ito decomposition of the second degree is used. The simulation of the method was carried out on real data. Evaluating performance was based on the use of cost matrix. The experimental comparison of the effectiveness of the developed ensemble-based method with a number of existing (simples and ensembles) demonstrates the best performance of the developed method. Experimental studies of changing the parameters of the Random Forest both for the basic algorithm and for the developed method demonstrate a significant improvement of the investigated efficiency measures of the latter. It is the result of all steps of the preprocessing stage of the developed method use.
Źródło:
ECONTECHMOD : An International Quarterly Journal on Economics of Technology and Modelling Processes; 2019, 8, 2; 3-8
2084-5715
Pojawia się w:
ECONTECHMOD : An International Quarterly Journal on Economics of Technology and Modelling Processes
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Spectrum analyzers for nonlinear phenomena investigations
Autorzy:
Tkachenko, V.
Frish, A.
Goryacheva, H.
Karplyuk, I.
Powiązania:
https://bibliotekanauki.pl/articles/331746.pdf
Data publikacji:
1999
Wydawca:
Polskie Towarzystwo Akustyczne
Opis:
The subject of the paper is the application of digital signal processing (DSP) to nonlinear hydroacoustic, acoustic and mechanic phenomena investigations. To provide such investigations a spectrum analyzer with additional functions of polyspectra and virtual input channel is proposed. The mathematics, equipment and programming of the analyzer are discussed. It is shown how the analyzer enables to detect and to explore the random impulse sequences combined with one another and with Gaussian noise, to separate the oscillations having close unstable frequencies, to observe the nonlinear interaction between oscillation modes, to detect the noise emission accompanying the oscillation mode energy dissipation.
Źródło:
Hydroacoustics; 1999, 2; 267-272
1642-1817
Pojawia się w:
Hydroacoustics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Thyroid cancer risk assesment among the population of Pomeranian and West Pomeranian voivodeship (Poland)
Ocena ryzyka zachorowalności i umieralności na nowotwory tarczycy wśród mieszkańców województw pomorskiego i zachodniopomorskiego (Polska)
Autorzy:
Kasiyan, O.
Tkachenko, H.
Kurhaluk, N.
Yurchenko, S.
Jazewicz, I.
Dunayevska, S.
Powiązania:
https://bibliotekanauki.pl/articles/2053037.pdf
Data publikacji:
2019
Wydawca:
Akademia Pomorska w Słupsku
Tematy:
thyroid cancer
morbidity
mortality
relative risk
adults
children
Opis:
The objective of our study was to compare recent secular trends in the morbidity and mortality rates of thyroid cancer among the children and adult populations of West Pomeranian and Pomeranian Voivodeships in 2000 and 2016. The number of thyroid cancer cases and incidence rates were retrieved from the Regional Cancer Registries for the period 2000-2016. The number of deaths and mortality rates was obtained from the cancer mortality database (2000 and 2016 by regions). The increase in the incidence rates among the female population in the Pomeranian Voivodeship was observed (from 11.31 in 2000 to 32.04 per 100,000 persons in 2016). Among the child population, the incidence has increased slightly among girls. The adult mortality rate remained unchanged during the study period and was not recorded among other populations. The highest incidence in West Pomeranian Voivodeship is observed among women in 2016 and stands at 22.46 per 100,000 population. Mortality increased slightly during the study period among the female population. The relative risk of thyroid cancer mortality was increased among the adult population of West Pomeranian Voivodeship. Therefore, both thyroid cancer morbidity and mortality are occurring mainly at the expense of the female population. These trends, combined with overall high mortality and high 15-year increase of morbidity, raise concerns on the extent to which the situation may be taking place.
Źródło:
Baltic Coastal Zone. Journal of Ecology and Protection of the Coastline; 2019, 23; 21-32
1643-0115
Pojawia się w:
Baltic Coastal Zone. Journal of Ecology and Protection of the Coastline
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Monitoring of dynamic objects by observation systems of visible range of waves
Monitoring obiektów dynamicznych przy pomocy systemów obserwacyjnych z widzialnego zakresu fal
Autorzy:
Prudyus, I.
Tkachenko, V.
Lazko, L.
Kondratov, P.
Fabirovskyy, S.
Hryvachevskyi, A.
Powiązania:
https://bibliotekanauki.pl/articles/210954.pdf
Data publikacji:
2018
Wydawca:
Wojskowa Akademia Techniczna im. Jarosława Dąbrowskiego
Tematy:
monitoring wideo
wykrywanie poruszających się obiektów
wykrywanie poruszających się cieni
odejmowanie tła
różnica między ramkami
video monitoring
detection of moving objects
detection of moving shadows
background subtraction
interframe difference
Opis:
The article deals with the problem of correct detection of moving objects when they are monitored by the monitoring system that operates in the visible range of the electromagnetic radiation spectrum. Based on the analysis of existing methods, for detection of moving objects there is proposed an algorithm that is adaptive to destabilizing factors. This algorithm makes it possible to increase the accuracy of moving objects detection. The algorithm takes into account the presence of noise and its heterogeneity, both in space and time, and also removes the influence of moving shadows. The correctness of the algorithms described in this article is confirmed by their software implementation and modelling. In the process of modelling, the accuracy of object detection, proposed by the algorithm under different observation conditions, and the motion parameters of the objects were estimated.
Artykuł porusza problem prawidłowego wykrywania poruszających się obiektów, gdy są one monitorowane przez system monitorujący działający w widzialnym zakresie spektrum promieniowania elektromagnetycznego. Na podstawie analizy istniejących metod zaproponowano adaptacyjny algorytm uwzględniający czynniki destabilizujące. Algorytm ten umożliwia zwiększenie dokładności wykrywania poruszających się obiektów. Uwzględnia on obecność szumu i jego niejednorodność, zarówno w przestrzeni, jak i w czasie, a także eliminuje wpływ ruchomych cieni. Poprawność algorytmów, opisanych w tym artykule, potwierdzono w czasie ich realizacji i modelowania. W trakcie symulacji przeprowadzono oszacowanie dokładności detekcji obiektów według zaproponowanego algorytmu w różnych warunkach obserwacji i dla różnych parametrów ruchu obiektu.
Źródło:
Biuletyn Wojskowej Akademii Technicznej; 2018, 67, 2; 15-26
1234-5865
Pojawia się w:
Biuletyn Wojskowej Akademii Technicznej
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
System for control physical fields of the ships
Autorzy:
Tkachenko, V.
Frish, A.
Muratov, V.
Karplyuk, I.
Ponomarev, A.
Oleshkevitch, V
Narchev, V.
Powiązania:
https://bibliotekanauki.pl/articles/332298.pdf
Data publikacji:
2001
Wydawca:
Polskie Towarzystwo Akustyczne
Opis:
The subject of the paper is the application of digital signal processing (DSP) to nonlinear hydroacoustic, acoustic and mechanic phenomena investigations. To provide such investigations a spectrum analyser with additional functions of polyspectra and virtual input channel is proposed. A serial number instruments and systems has been created on the base of development of the complexes which can evaluate the above mentioned high order spectra for analysing hydroacoustic and hydrophysical signals or electromagnetic signals of navy objects. Several modes of the analysers architecture are accomplish in our Institutes: full hardware with build-in microcomputer, external device interfaced with PC and base on 16-bit Analog Devices δ-∑ codecTM environment mount in PC which works in DOS or WindowsTM mode. These complexes were used for development the testing environment for navy polygons and may be use in navy system of the barrier defence.
Źródło:
Hydroacoustics; 2001, 4; 241-244
1642-1817
Pojawia się w:
Hydroacoustics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Boosting-based model for solving Sm-Co alloy’s maximum energy product prediction task
Autorzy:
Trostianchyn, A.M.
Izonin, I.V.
Duriagina, Z.A.
Tkachenko, R.O.
Kulyk, V.V.
Havrysh, B.M.
Powiązania:
https://bibliotekanauki.pl/articles/24200577.pdf
Data publikacji:
2022
Wydawca:
Stowarzyszenie Komputerowej Nauki o Materiałach i Inżynierii Powierzchni w Gliwicach
Tematy:
Sm-Co alloy
ensemble learning
gradient boosting
prediction accuracy
Stop Sm-Co
uczenie zespołowe
dokładność przewidywania
Opis:
Purpose: This paper aims to decide the Sm-Co alloy’s maximum energy product prediction task based on the boosting strategy of the ensemble of machine learning methods. Design/methodology/approach: This paper examines an ensemble-based approach to solving Sm-Co alloy’s maximum energy product prediction task. Because classical machine learning methods sometimes do not supply acceptable precision when solving the regression problem, the authors investigated the boosting ML model, namely Gradient Boosting. Building a boosting model based on several weak submodels, each of which considers the errors of the prior ones, provides substantial growth in the accuracy of the problem-solving. The obtained result is confirmed using an actual data set collected by the authors. Findings: This work demonstrates the high efficiency of applying the ensemble strategy of machine learning to the applied problem of materials science. The experiments determined the highest accuracy of solving the forecast task for the maximum energy product of Sm-Co alloy formed on the boosting model of machine learning in comparison with classical methods of machine learning. Research limitations/implications: The boosting strategy of machine learning, in comparison with single algorithms of machine learning, requires much more computational and time resources to implement the learning process of the model. Practical implications: This work demonstrated the possibility of effectively solving Sm-Co alloy’s maximum energy product prediction task using machine learning. The studied boosting model of machine learning for solving the problem provides high accuracy of prediction, which reveals several advantages of their use in solving issues applied to computational material science. Furthermore, using the Orange modelling environment provides a simple and intuitive interface for using the researched methods. The proposed approach to the forecast significantly reduces the time and resource costs associated with studying expensive rare earth metals (REM)-based ferromagnetic materials. value: The authors have collected and formed a set of data on predicting the maximum energy product of the Sm-Co alloy. We used machine learning tools to solve the task. As a result, the most increased forecasting precision based on the boosting model is demonstrated compared to classical machine learning methods.
Źródło:
Archives of Materials Science and Engineering; 2022, 116, 2; 71--80
1897-2764
Pojawia się w:
Archives of Materials Science and Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
    Wyświetlanie 1-8 z 8

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