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Advances in Materials Science
EN The paper presents an evaluation of 17 materials produced in Poland as to their cavitation resistance. In the paper new factor of cavitation erosion resistance of materials, representing some results from whole erosion test is proposed. New coefficient of cavitation erosion resistance R is a functio[...]
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Przegląd Elektrotechniczny
2003 R. 79, nr 10 783-786
PL Praca przedstawia analizę efektu błędów pomiarowych anteny i wzajemnego sprzężenia sygnałów w szerokopasmowej estymacji kierunku nadchodzenia sygnału (DOA). Zaproponowano metodę estymacji szerokopasmowego DOA bez procesu kalibracji. Efekty niedokładności określania wartości elementów tablic jak równ[...]
EN This paper considers the effects of array imperfection and mutual coupling on performance of wideband direction-of-arrival (DOA) estimation in wideband smart antennas. A wideband DOA estimation method without array calibration is then proposed to deal with these effects using arbitrary antenna arra[...]
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Prace Naukowe Instytutu Maszyn, Napędów i Pomiarów Elektrycznych Politechniki Wrocławskiej. Studia i Materiały
EN In the work issues related to modeling of the biological-chemical wastewater treatment plant are presented. A commonly-used control strategy including model predictive control of the wastewater treatment plant are presented. Then a model of biological and chemical transformations AMS1 is described a[...]
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Materials Science Poland
2007 Vol. 25, No. 3 851--859
EN Diffusion is the process of transport due to gradient of concentration and random molecular motion. In low permeability materials like clay or gels, diffusion is the most important transport mechanism [1, 2] and therefore identification of an appropriate model and parameters describing the process o[...]
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Annual of Navigation
2006 No. 11 29-36
EN The paper describes and solves the problem of optimization, conforming to the Interactive Navigational Structure, represented by the functional model and the model of deterministic errors. The objective functions of the optimization problem have been formulated basing on the M-estimation theory, ext[...]
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Systems Science
EN In this work, the problem of skin wound volume estimation is considered. A review of currently developed methods is given. We proposed an estimation method based on structure light patterns and three-dimensional reconstruction technique. The method is non-invasive, safe for a patient, easy for use, [...]
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Zeszyty Naukowe Katedry Mechaniki Stosowanej / Politechnika Śląska
2004 z. 23 501-506
PL Praca dotyczy szacowania błędów a posteriori metodą wyrównoważania residuów elementowych i wiąże się z adaptacyjną analizą struktur złożonych obejmujących części bryłowe, grubo- i cienkościenne oraz strefy przejściowe. Omówiono szacowanie błędów aproksymacji i modelowania oraz błędu całkowitego w pr[...]
EN The paper addresses a posteriori error estimation by means of Residual ttquilibration Method and deals with adaptive analysis of complex structures consisting of solid, thick-walled and thin-walled parts as well as of transition zones. The paper presents approximation, modelling and total error esti[...]
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Metrology and Measurement Systems
EN An exact expression for the expected value of the mean square difference of the two data sets acquired during the IEEE 1057 Standard Random Noise Test of analog to digital converters is derived. This expression can be used to estimate exactly the amount of random noise present which is an improvemen[...]
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Foundations of Computing and Decision Sciences
EN In an on-line car satellite navigation system users may communicate with the system's operator and send them information about some objects in a road network, e.g. dangerous places or safety cameras. The operator of such a system may publish this information for the benefit of other users, but f[...]
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Prace Naukowe Politechniki Warszawskiej. Elektronika
2006 z. 154 3-147
PL W pracy przedstawiono nowe podejście do projektowania optymalnych adaptacyjnych systemów estymacji (ASE) przeznaczonych doestymacji parametrów i bieżących wartości procesów fizycznych i sygnałów. Cechą szczególną podejścia jest jednoczesna, łączna optymalizacja części cyfrowej systemu, tj. algorytmó[...]
EN The monograph presents a new approach to optimal adaptive estimation systems (AES) design. The considered systems are predestined for estimation of the parameters and current values of physical processes and signals. Particular feature of the approach is a current, joint optimisation of the digital [...]
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Geodezja / Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie
2001 T. 7, z. 2 217-228
PL Teoretyczną podstawą wielu formułowanych współcześnie metod wyrównania jest ogólna zasada M-estymacji. Zasada ta polega na poszukiwaniu minimum następującej funkcji celu [wzór], gdzie X jest wektorem nieznanych parametrów. Wyprowadzenie nowej metody wyrównania polega na przyjęciu uzasadnionej, konkr[...]
EN The principle of M-estimation is the basis of many contemporary methods of adjustment. The point about this class of methods is to minimize the following function [formula] where X is the vector of unknown parameters. New method of adjustment is created by assumption of a specific form of function a[...]
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Management
2003 Vol. 7, no 1 213-225
EN This paper uses the generalised skew Student (GST) distribution to model returns on Polish stocks that are constituents of the WIG20 index. A basic analysis of returns provides strong evidence of skewness and kurtosis, both of which can be accommodated by the generalised skew Student model. Three sp[...]
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Demonstratio Mathematica. Warsaw Technical University Institute of Mathematics
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Archives of Control Sciences
EN The paper addresses multiple targets tracking problem encountered in number of situations in signal and image processing. In this paper, we present an efficient filtering algorithm to perform accurate estimation in jump Markov nonlinear systems, which we aim to contribute in solving the problem of m[...]
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Archives of Acoustics
2014 Vol. 39, No. 2 195--198
EN The authors focus their attention on the analysis of the probability density function of the equivalent noise level, in the context of a determination of the uncertainty of the obtained results in regard to the control of environmental acoustic hazards. In so doing, they discuss problems of correctn[...]
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Archives of Electrical Engineering
2014 Vol. 63, nr 2 149--160
EN Contemporary sensorless AC drives require the use of electromechanical quantities estimation. The skin effect occurring in AC machines with solid secondary or with solid secondary elements causes machines of this type to be represented by equivalent circuits containing distributed elements, which ma[...]
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International Journal of Electronics and Telecommunications
EN The Track-Before-Detect (TBD) filter banks is proposed for the processing of noise object that are additive to the background noise. Spatio-Temporal TBD algorithm uses the preprocessing of measurement. The modified moving standard deviation filter is applied. The correction of the results for the se[...]
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Archives of Control Sciences
EN This paper aims to contribute in solving the problem of model-based body motion estimation by using data coming from visual sensors. We consider the case of state estimation in jump Markov nonlinear systems. The Interacting Multiple Model (IMM) algorithm is specially designed to track accurately tar[...]
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Archives of Acoustics
EN In this paper a method of time delay estimation of acoustic signals radiated in water has been shown. The source of these signals is a moving ship. The gradient adaptive method of minimizing the error has been used. An algorithm of estimation using this method and the results of estimation the real [...]
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Computer Applications in Electrical Engineering
2013 Vol. 11 447--454
EN Track-Before-Detect (TBD) algorithms are applied for the tracking of signals below the noise floor. The noise object is the signal that has noise samples only. The processing of such signal using Spatio-Temporal TBD is not possible directly. The preprocessing technique based on the window approach a[...]
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