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Tytuł:
Trajectory Estimation for Wireless Mobile Networks Using Polynomial Regression
Autorzy:
Al-Hattab, M.
Agbinya, J. I.
Powiązania:
https://bibliotekanauki.pl/articles/226740.pdf
Data publikacji:
2010
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
topology
prediction
polynomial regression
Opis:
Arbitrary and random motion of mobile ad hoc network nodes while communicating results in frequent topology changes and multiple disconnections of links. This dynamic environment challenges the routing of data from the source to the destination and imposes the need for prediction models to track these changes, and then determine future topology of the network. The prediction of network mobility into the future will reduce the frequency of location updates for geographical routing protocols. Moreover it will reduce route request delay and the frequency of route updates in topology based protocols. This paper proposes a predictive model called polynomial regression trajectory estimation. This model is based on the regular behavior of nodes and uses polynomial regression to allow each mobile node to estimate its future locations as a function of time. The estimated locations will be disseminated to the network so that nodes can use them to estimate the future topologies of the entire network. The efficiency of the proposed model has been evaluated by MATLAB simulation.
Źródło:
International Journal of Electronics and Telecommunications; 2010, 56, 4; 451-456
2300-1933
Pojawia się w:
International Journal of Electronics and Telecommunications
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Application of the polynomial interpolation method for determining performance characteristics of a diesel engine
Autorzy:
Stoeck, T.
Abramek, K. F.
Powiązania:
https://bibliotekanauki.pl/articles/221203.pdf
Data publikacji:
2014
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
post measurements
polynomial interpolation
performance characteristics
diesel engine
Opis:
The article shows the methodology and calculation procedures based on Lagrange polynomial interpolation which were used to determine standard performance characteristics of the Polish production engine, type ANDORIA 4CTi90-1BE6. They allow to simplify the experimental research by maintaining a minimum number of measurement points and estimating the remaining data in an analytical way. The methods presented are convenient when it comes to the practical side because they eliminate the need for exploration of mathematical equations describing the various curves, which can be cumbersome and time consuming in the case of nonautomated accounts. The results of analysis were applied to actual experimental results, indicating sufficient accuracy of the resulting approximations. As a result, procedures may be used in bench testing of a similar profile, especially with repeated cycles of the experiment, such as optimization of operating parameters of combustion engines.
Źródło:
Metrology and Measurement Systems; 2014, 21, 1; 157-168
0860-8229
Pojawia się w:
Metrology and Measurement Systems
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Dynamic decoupling of left-invertible MIMO LTI plants
Autorzy:
Dworak, P.
Powiązania:
https://bibliotekanauki.pl/articles/229937.pdf
Data publikacji:
2011
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
dynamic decoupling
left-invertible
pole assignment
polynomial matrix equations
Opis:
In the paper problems with dynamic decoupling of the left-invertible multi-input multi-output dynamic (MIMO) linear time invariant (LTI) plants are considered. It is presented an universal and efficient algorithm for synthesis of control system for proper, square, right and left invertible plants which can be both unstable and/or non-minimumphase.
Źródło:
Archives of Control Sciences; 2011, 21, 4; 443-459
1230-2384
Pojawia się w:
Archives of Control Sciences
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
A subinterval-based method for circuits with fractional order elements
Autorzy:
Sowa, M.
Powiązania:
https://bibliotekanauki.pl/articles/201236.pdf
Data publikacji:
2014
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
fractional derivative
circuit equations
numerical method
polynomial interpolation
subinterval
Opis:
The paper deals with the solution of problems that concern fractional time derivatives. Specifically the author’s interest lies in solving circuit problems with so called fractional capacitors and fractional inductors. A numerical method is proposed that involves polynomial interpolation and the division of the entire time interval (for which computations are performed) into subintervals. Analytical formulae are derived for the integro-differentiation according to the Caputo fractional derivative. The rules that concern the subinterval dynamics throughout the computation are also presented in the paper. For exemplary linear circuit problems (AC and transient) involving fractional order elements the solutions have been obtained. These solutions are compared with ones obtained by means of traditional methods.
Źródło:
Bulletin of the Polish Academy of Sciences. Technical Sciences; 2014, 62, 3; 449-454
0239-7528
Pojawia się w:
Bulletin of the Polish Academy of Sciences. Technical Sciences
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Kriging approach for local height transformations
Zastosowanie metody krigingu do lokalnej transformacji wysokości
Autorzy:
Ligas, M.
Kulczycki, M.
Powiązania:
https://bibliotekanauki.pl/articles/145483.pdf
Data publikacji:
2014
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
lokalna transformacja wysokości
kriging
metody geostatyczne
polynomial regression
height transformation
Opis:
In the paper a transformation between two height datums (Kronstadt’60 and Kronstadt’86, the latter being a part of the present National Spatial Reference System in Poland) with the use of geostatistical method - kriging is presented. As the height differences between the two datums reveal visible trend a natural decision is to use the kind of kriging method that takes into account nonstationarity in the average behavior of the spatial process (height differences between the two datums). Hence, two methods were applied: hybrid technique (a method combining Trend Surface Analysis with ordinary kriging on least squares residuals) and universal kriging. The background of the two methods has been presented. The two methods were compared with respect to the prediction capabilities in a process of crossvalidation and additionally they were compared to the results obtained by applying a polynomial regression transformation model. The results obtained within this study prove that the structure hidden in the residual part of the model and used in kriging methods may improve prediction capabilities of the transformation model.
W artykule przedstawiono lokalną transformację między dwoma układami wysokości (Kronsztadt’60 oraz Kronsztadt’86, ostatni z nich będący obecnie częścią Państwowego Systemu Odniesień Przestrzennych w Polsce) z wykorzystaniem metod geostatystycznych - kriging. Ze względu na fakt, iż różnice wysokości między dwoma układami na punktach dostosowania wykazywały silny trend pod uwagę wzięto tylko te metody, które uwzględniają tego typu niestacjonarność procesu. Zastosowano dwie metody: hybrydową (Analiza Trendu Powierzchniowego z interpolacją reszt do modelu za pomocą krigingu zwyczajnego) oraz kriging uniwersalny. Przedstawiono rys teoretyczny obydwu metod. Dokonano porównania wyżej wymienionych metod pod względem ich zdolności predykcyjnych w procesie kroswalidacji modeli a zarazem otrzymane wyniki skonfrontowano z wynikami otrzymanymi z regresji wielomianowej. Otrzymane wyniki dowodzą, iż struktura ukryta w rezydualnej części modelu używana przez kriging może podnieść zdolności predykcyjne modelu transformacji.
Źródło:
Geodesy and Cartography; 2014, 63, 1; 25-37
2080-6736
2300-2581
Pojawia się w:
Geodesy and Cartography
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Bayesian Analysis of Weak Form Polynomial Reduced Rank Structures in VEC Models
Autorzy:
Wróblewska, Justyna
Powiązania:
https://bibliotekanauki.pl/articles/483287.pdf
Data publikacji:
2012
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
cointegration
Bayesian analysis
polynomial common cyclical features
permanent-transitory decompostion
Opis:
The main goal of the paper is the Bayesian analysis of weak form polynomial serial correlation common features together with cointegration. In the VEC model the serial correlation common feature leads to an additional reduced rank restriction imposed on the model parameters. After the introduction and discussion of the model, the methods will be illustrated with an empirical investigation of the price-wage nexus in the Polish economy. Additionally, consequences of imposing such additional short-run restrictions for permanent-transitory decomposition will be discussed.
Źródło:
Central European Journal of Economic Modelling and Econometrics; 2012, 4, 4; 253-267
2080-0886
2080-119X
Pojawia się w:
Central European Journal of Economic Modelling and Econometrics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Rational polynomial windows with high attenuation of sidelobes
Autorzy:
Okarma, K.
Powiązania:
https://bibliotekanauki.pl/articles/140604.pdf
Data publikacji:
2012
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
przetwarzanie sygnałów
analiza spektralna
polynomial windows
signal processing
spectrum analysis
Opis:
In the paper the idea of rational polynomial windows optimised towards low level of Fourier spectrum's sidelobes is presented. A relevant advantage of the polynomial windows family and their modifications is their ability to easily change their properties changing only the values of the polynomial coefficients. The obtained frequency characteristics demonstrate better properties of proposed rational Windows than their standard polynomial equivalents requiring only the additional division operation. Such approach does not increase the computational complexity in significant way and the great advantage of polynomial windows which is their low computational complexity is preserved.
Źródło:
Archives of Electrical Engineering; 2012, 61, 1; 7-14
1427-4221
2300-2506
Pojawia się w:
Archives of Electrical Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Computer methods for calculating tuple solutions of polynomial matrix equations
Autorzy:
Dorożyński, J.
Nedashkovskyy, M.
Powiązania:
https://bibliotekanauki.pl/articles/200783.pdf
Data publikacji:
2020
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
matrix polynomial equations
discrete (time) Riccati equation
tuples of solutions
MATLAB
Opis:
Schemes are presented for calculating tuples of solutions of matrix polynomial equations using continued fractions. Despite the fact that the simplest matrix equations were solved in the second half of the 19th century, and the problem of multiplier decomposition was then deeply analysed, many tasks in this area have not yet been solved. Therefore, the construction of computer schemes for calculating the sequences of solutions is proposed in this work. The second-order matrix equations can be solved by a matrix chain function or iterative method. The results of the numerical experiment using the MatLab package for a given number of iterations are presented. A similar calculation is done for a symmetric square matrix equation of the 2nd order. Also, for the discrete (time) Riccati equation, as its analytical solution cannot be performed yet, we propose constructing its own special scheme of development of the solution in the matrix continued fraction. Next, matrix equations of the n-th order, matrix polynomial equations of the order of non-canonical form, and finally, the conditions for the termination of the iterative process in solving matrix equations by branched continued fractions and the criteria of convergence of matrix branching chain fractions to solutions are discussed.
Źródło:
Bulletin of the Polish Academy of Sciences. Technical Sciences; 2020, 68, 2; 235-243
0239-7528
Pojawia się w:
Bulletin of the Polish Academy of Sciences. Technical Sciences
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Acoustical Assessment of Automotive Mufflers Using FEM, Neural Networks, and a Genetic Algorithm
Autorzy:
Chang, Y.-C.
Chiu, M.-C.
Wu, M.-R.
Powiązania:
https://bibliotekanauki.pl/articles/177901.pdf
Data publikacji:
2018
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
acoustics
finite element method
genetic algorithm
muffler optimization
polynomial neural network model
Opis:
In order to enhance the acoustical performance of a traditional straight-path automobile muffler, a multi-chamber muffler having reverse paths is presented. Here, the muffler is composed of two internally parallel/extended tubes and one internally extended outlet. In addition, to prevent noise transmission from the muffler’s casing, the muffler’s shell is also lined with sound absorbing material. Because the geometry of an automotive muffler is complicated, using an analytic method to predict a muffler’s acoustical performance is difficult; therefore, COMSOL, a finite element analysis software, is adopted to estimate the automotive muffler’s sound transmission loss. However, optimizing the shape of a complicated muffler using an optimizer linked to the Finite Element Method (FEM) is time-consuming. Therefore, in order to facilitate the muffler’s optimization, a simplified mathematical model used as an objective function (or fitness function) during the optimization process is presented. Here, the objective function can be established by using Artificial Neural Networks (ANNs) in conjunction with the muffler’s design parameters and related TLs (simulated by FEM). With this, the muffler’s optimization can proceed by linking the objective function to an optimizer, a Genetic Algorithm (GA). Consequently, the discharged muffler which is optimally shaped will improve the automotive exhaust noise.
Źródło:
Archives of Acoustics; 2018, 43, 3; 517-529
0137-5075
Pojawia się w:
Archives of Acoustics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Real-time parameter estimation study for inertia properties of ground vehicles
Metody estymacji parametrów w czasie rzeczywistym dla wyznaczania właściwości inercyjnych pojazdu terenowego
Autorzy:
Kolansky, J.
Sandu, C.
Powiązania:
https://bibliotekanauki.pl/articles/139960.pdf
Data publikacji:
2013
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
parameter estimation
EKF
polynomial chaos
bayesian statistics
estymacja parametrów
chaos wielomianowy
statystyka bayesowska
Opis:
Vehicle parameters have a significant impact on handling, stability, and rollover propensity. This study demonstrates two methods that estimate the inertia values of a ground vehicle in real-time. Through the use of the Generalized Polynomial Chaos (gPC) technique for propagating the uncertainties, the uncertain vehicle model outputs a probability density function for each of the variables. These probability density functions (PDFs) can be used to estimate the values of the parameters through several statistical methods. The method used here is the Maximum A-Posteriori (MAP) estimate. The MAP estimate maximizes the distribution of P(β ׀z) where β is the vector of the PDFs of the parameters and z is the measurable sensor comparison. An alternative method is the application of an adaptive filtering method. The Kalman Filter is an example of an adaptive filter. This method, when blended with the gPC theory is capable at each time step of updating the PDFs of the parameter distributions. These PDF’s have their median values shifted by the filter to approximate the actual values.
Parametry pojazdu mają znaczny wpływ na jego właściwości, takie jak sterowalność, stabilność i odporność na wywrócenie. W pracy przedstawiono dwie metody estymacji parametrów inercyjnych pojazdu terenowego w czasie rzeczywistym. W modelu pojazdu z niepewnościami wyznacza się funkcje gęstości prawdopodobieństwa (PDF) dla każdej wielkości opisując propagację niepewności przez zastosowanie techniki uogólnionego chaosu wielomianowego (gPC). Funkcje te mogą być użyte do estymacji wartości parametrów przy wykorzystaniu różnych metod statystycznych. W pracy zastosowano metodę maksymalnego estymatora a posteriori (MAP). Estymator MAP maksymalizuje funkcję rozkładu P(β ׀z), gdzie β jest wektorem funkcji gęstości prawdopodobieństwa parametrów, a z jest wielkością mierzalną, otrzymaną z porównania wyjść czujników. Metodą alternatywną jest zastosowanie filtru adaptacyjnego, którego przykładem jest filtr Kalmana. Metoda ta, w połączeniu z techniką uogólnionego chaosu wielomianowego (gPC), umożliwia, w każdym kroku adaptacji, uaktualnianie funkcji gęstości prawdopodobieństwa (PDF) parametrów systemu. Działanie filtru powoduje, że mediany tych funkcji zmieniają się dążąc do rzeczywistych wartości poszukiwanych parametrów.
Źródło:
Archive of Mechanical Engineering; 2013, LX, 1; 7-21
0004-0738
Pojawia się w:
Archive of Mechanical Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Squaring down plant model and I/O grouping strategies for a dynamic decoupling of left-invertible MIMO plants
Autorzy:
Dworak, P.
Powiązania:
https://bibliotekanauki.pl/articles/200946.pdf
Data publikacji:
2014
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
multivariable systems
MIMO
dynamic decoupling
left-invertible systems
input-output pairing
polynomial approach
Opis:
In the paper problems with dynamic decoupling of the left-invertible multi-input multi-output dynamic (MIMO) linear time invariant plants using a squaring down technique are considered. The procedure of squaring down the plant model and grouping of plant inputs and outputs are discussed. The final part of the paper includes a few examples of different strategies of synthesis of a decoupled system along with conclusions and final remarks.
Źródło:
Bulletin of the Polish Academy of Sciences. Technical Sciences; 2014, 62, 3; 471-479
0239-7528
Pojawia się w:
Bulletin of the Polish Academy of Sciences. Technical Sciences
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Pole-free vs. stable-pole designs of minimum variance control for nonsquare LTI MIMO systems
Autorzy:
Hunek, W.
Powiązania:
https://bibliotekanauki.pl/articles/202277.pdf
Data publikacji:
2011
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
minimum variance control
multivariable control
inverses of polynomial matrices
control zeros
minimum phase systems
Opis:
This paper takes advantage of nonuniqueness of the inverse problem for nonsquare transfer function matrices of multivariable systems in order to select such poles, if any, of a minimum variance control system that can either guarantee its closed-loop stability or provide (a sort of) robustness to the control system. As a result, new pole-free and stable-pole MVC designs are offered for nonsquare LTI MIMO systems, the most general of them utilizing the Smith-factorization approach and the so-called control zeros. The new designs contribute to an illustration and extension of the Davison’s theory of (nonsquare) minimum phase systems, in that the lack or presence of (appropriate) control zeros can provide a required performance to the MVC system. Simulation examples in the Matlab/Simulink environment confirm the potential of the control zeros and their impact on redefinition of the minimum phase property.
Źródło:
Bulletin of the Polish Academy of Sciences. Technical Sciences; 2011, 59, 2; 201-211
0239-7528
Pojawia się w:
Bulletin of the Polish Academy of Sciences. Technical Sciences
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Equitable Coloring of Graphs. Recent Theoretical Results and New Practical Algorithms
Autorzy:
Furmańczyk, H.
Jastrzębski, A.
Kubale, M.
Powiązania:
https://bibliotekanauki.pl/articles/230069.pdf
Data publikacji:
2016
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
computer experiments
corona graph
equitable chromatic number
equitable coloring conjectures
NP-hardness
polynomial heuristics
Opis:
In many applications in sequencing and scheduling it is desirable to have an underlaying graph as equitably colored as possible. In this paper we survey recent theoretical results concerning conditions for equitable colorability of some graphs and recent theoretical results concerning the complexity of equitable coloring problem. Next, since the general coloring problem is strongly NP-hard, we report on practical experiments with some efficient polynomial-time algorithms for approximate equitable coloring of general graphs.
Źródło:
Archives of Control Sciences; 2016, 26, 3; 281-295
1230-2384
Pojawia się w:
Archives of Control Sciences
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Digraph-building method for finding a set of minimal realizations of 2-D dynamic systems
Autorzy:
Markowski, K. A.
Hryniów, K.
Powiązania:
https://bibliotekanauki.pl/articles/200035.pdf
Data publikacji:
2018
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
2-D system
characteristic polynomial
digraph
minimal realization
MATLAB
system 2D
wielomian
graf dwudzielny
Opis:
This paper presents a digraph-building method designed to find the determination of realization of two-dimensional dynamic system. The main differences between the method proposed and other state-of-the-art solutions used include finding a set of realizations (belonging to a defined class) instead of only one realization, and the fact that obtained realizations have minimal size of state matrices. In the article, the proposed method is described, compared to state-of-the-art methods and illustrated with numerical examples. To the best of authors’ knowledge, the method shown in the paper is superior to all other state-of-the-art solutions both in terms of number of solutions and their matrix size. Additionally, MATLAB function for determination of realization based on the set of state matrices is included.
Źródło:
Bulletin of the Polish Academy of Sciences. Technical Sciences; 2018, 66, 5; 589-597
0239-7528
Pojawia się w:
Bulletin of the Polish Academy of Sciences. Technical Sciences
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Due window assignment and scheduling on parallel machines: a FPTAS for a bottleneck criterion
Autorzy:
Janiak, A.
Janiak, W.
Kovalyov, M. Y.
Powiązania:
https://bibliotekanauki.pl/articles/200522.pdf
Data publikacji:
2014
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
fully polynomial time approximation scheme
scheduling
due window assignment
aproksymacja wielomianem
schemat
planowanie
okno przypisania
Opis:
A fully polynomial time approximation scheme (FPTAS) with run time 0(nm/ εm-1) is developed for a problem which combines common due window assignment and scheduling n jobs on m identical parallel machines. The problem criterion is bottleneck (min-max) such that the maximum cost, which includes job earliness, job tardiness and due window size costs, is minimized.
Źródło:
Bulletin of the Polish Academy of Sciences. Technical Sciences; 2014, 62, 4; 805-808
0239-7528
Pojawia się w:
Bulletin of the Polish Academy of Sciences. Technical Sciences
Dostawca treści:
Biblioteka Nauki
Artykuł
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