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Wyświetlanie 1-13 z 13
Tytuł:
Classification of EEG Signals Using Quantum Neural Network and Cubic Spline
Autorzy:
Abdul-Zahra Raheem, M.
AbdulRazzaq Hussein, E.
Powiązania:
https://bibliotekanauki.pl/articles/227206.pdf
Data publikacji:
2016
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
signals
ERP signals
cubic spline
neural networks
quantum neural network
Opis:
The main aim of this paper is to propose Cubic Spline-Quantum Neural Network (CS-QNN) model for analysis and classification of Electroencephalogram (EEG) signals. Experimental data used here were taken from seven different electrodes. The work has been done in three stages, normalization of the signals, extracting the features by Cubic Spline Technique (CST) and classification using Quantum Neural Network (QNN). The simulation results showed that five types of EEG signals were classified with an average accuracy for seven electrodes that is 94.3% when training 70% of the features while with an average accuracy of 92.84% when training 50% of the features.
Źródło:
International Journal of Electronics and Telecommunications; 2016, 62, 4; 401-408
2300-1933
Pojawia się w:
International Journal of Electronics and Telecommunications
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Bandung City Rainfall Data Interpolation Using Two Types of Cubic Spline Interpolation
Autorzy:
Haq, Al Fataa Waliyyul
Achmad, Audi Luqmanul Hakim
Purwani, Sri
Powiązania:
https://bibliotekanauki.pl/articles/1193368.pdf
Data publikacji:
2021
Wydawca:
Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
Tematy:
Interpolation
natural cubic spline
not-a-knot cubic spline
Opis:
This study discusses the application of two types of cubic spline, namely natural cubic spline and not-a-knotcubic spline. The applications of both types of splines are regarding rainfall data. The rainfall data studied were the monthly rainfall data for the year 2018 and 2019 in Bandung City which was obtained from the Bandung City Central Statistics Agency. Interpolation and analysis were carried out on all data using Maple software. As a result, interpolation using natural cubic spline and not-a-knotcubic spline shows a smoother and less oscillating graph than interpolation using Piecewise Linear and Polynomial Interpolation.
Źródło:
World Scientific News; 2021, 155; 36-46
2392-2192
Pojawia się w:
World Scientific News
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The Use of Cubic Spline Functions to Two-point Boundary Value Problems
Autorzy:
Hobot, G.
Powiązania:
https://bibliotekanauki.pl/articles/747453.pdf
Data publikacji:
1992
Wydawca:
Polskie Towarzystwo Matematyczne
Tematy:
Boundary value problem
Opis:
W pracy podany jest algorytm, który konstruuje funkcję sklejaną stopnia 3-go będącą rozwiązaniem przybliżonym 2-punktowego, liniowego zadania brzegowego dla równań różniczkowych zwyczajnych. Korzysta on z faktu, że współczynniki poszukiwanej funkcji sklejanej zależą liniowo od parametru t, który jest równy wartości tej funkcji sklejanej w węźle xo. Algorytm wymaga O(N) działań arytmetycznych, gdzie A jest liczbą podpodziałów rozważanego przedziału. Oprócz algorytmu przedstawione są wyniki obliczeń, które uzyskano testując algorytm na kilku przykładach
In this paper we consider an algorithm for cubic spline function approximation of the solution of two-point boundary value problem for second order linear ordinary differential equation. This algorithm requires O(N) arithmetical operations, where N is the number of subdivisions of considered interval. Error bounds for the solution are derived and numerical examples are given.
Źródło:
Mathematica Applicanda; 1992, 21, 35
1730-2668
2299-4009
Pojawia się w:
Mathematica Applicanda
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Correction of sample-time error for time-interleaved sampling system using cubic spline interpolation
Autorzy:
Qin, G.
Liu, G.
Gao, M.
Fu, X.
Xu, P.
Powiązania:
https://bibliotekanauki.pl/articles/221115.pdf
Data publikacji:
2014
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
digital correction
sample-time error
time-interleaved sampling system
cubic spline interpolation
Opis:
Sample-time errors can greatly degrade the dynamic range of a time-interleaved sampling system. In this paper, a novel correction technique employing a cubic spline interpolation is proposed for inter-channel sample-time error compensation. The cubic spline interpolation compensation filter is developed in the form of a finite-impulse response (FIR) filter structure. The correction method of the interpolation compensation filter coefficients is deduced. A 4GS/s two-channel, time-interleaved ADC prototype system has been implemented to evaluate the performance of the technique. The experimental results showed that the correction technique is effective to attenuate the spurious spurs and improve the dynamic performance of the system.
Źródło:
Metrology and Measurement Systems; 2014, 21, 3; 485-496
0860-8229
Pojawia się w:
Metrology and Measurement Systems
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Application of Interpolation and Extrapolation of Newton and Cubic Splines to Estimate and Predict the Gas Content of Hydrogen and Iodine in the Formation of Iodic Acid Reactions
Autorzy:
Maryati, Ati
Pandiangan, Naomi
Purwani, Sri
Powiązania:
https://bibliotekanauki.pl/articles/1193309.pdf
Data publikacji:
2021
Wydawca:
Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
Tematy:
Cubic Spline Interpolation
Extrapolation and Time series data
Newtom Interpolation
Opis:
The problem that is mostly related to the pattern of experimental time series data is the function that involves the data. Experimental data in the field of exact sciences is very important to conclude a problem. Existing data can form certain functions. In this research, we are looking for a function that represents the gas content of hydrogen and iodine in the reaction of acid iodide formation. This is achieved by using interpolation in which the function interpolates a given group of data points. Interpolation can also be used to evaluate the function at points different from the group. In addition to constructing and evaluating a functions by interpolation, we can also predict experimental data outside the given group of data points by using extrapolation. The results of data extrapolation can be used as an alternative to experimental data, thereby saving time and cost. This research will also compare interpolation and extrapolation of both Newton method and cubic splines, which one better interpolates and extrapolates data on hydrogen and iodine gas content in the reaction of acid iodide formation. The research results show that the cubic spline method is better than Newton method at approaching data, in terms of interpolation, as well as extrapolation.
Źródło:
World Scientific News; 2021, 153, 2; 124-141
2392-2192
Pojawia się w:
World Scientific News
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
An association between cumulative exposure to light at night and the prevalence of hyperuricemia in steel workers
Autorzy:
Li, Xiaoming
Xu, Xianghui
Song, Yang
Cui, Shiyue
Xue, Chao
Wang, Lihua
Wu, Jianhui
Yuan, Juxiang
Powiązania:
https://bibliotekanauki.pl/articles/2085783.pdf
Data publikacji:
2021-06-28
Wydawca:
Instytut Medycyny Pracy im. prof. dra Jerzego Nofera w Łodzi
Tematy:
uric acid
circadian rhythms
hyperuricemia
steel workers
light at night
restricted cubic spline
Opis:
ObjectivesExposure to light at night (LAN) can disturb circadian endocrine and metabolic rhythms. Hyperuricemia (HUA) is an early-onset metabolic disorder. However, it is still not clear whether LAN exposure increases the prevalence of HUA.Material and MethodsThe authors used crosssectional data on the Beijing-Tianjin-Hebei occupational populations cohort from March–July 2017. A total of 7664 steel workers were finally selected to investigate the relationship between LAN exposure and the prevalence of HUA among steel workers. The authors collected demographic and socio-economic data, as well as information on lifestyle factors, anthropometric measures, and laboratory tests. The restricted cubic spline method was used to analyze the dose-response relationship between cumulative LAN exposure and the prevalence of HUA. Logistic regression analyses were used to fit the relationship between them.ResultsThe average age of the participants was 43.5±8.6 years; 7051 (91.7%) of them were males, 2749 (35.9%) reported to suffer from HUA, and 1241 (16.2%) were not exposed to LAN. There was a significant non-linear dose-response relationship between them. After adjustment for the confounding factors, including demographic data, lifestyle factors, etc., the lower LAN exposure was significantly associated with HUA (0–1931.7 days, OR = 1.180, and the 95% CI: 1.000–1.394; 1931.7–4343 days, OR = 1.215, 95% CI: 1.035–1.426).ConclusionsThis study revealed that a certain amount of exposure to LAN is independently related to the prevalence of HUA in steel workers in China.
Źródło:
International Journal of Occupational Medicine and Environmental Health; 2021, 34, 3; 385-401
1232-1087
1896-494X
Pojawia się w:
International Journal of Occupational Medicine and Environmental Health
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Application of cubic box spline wavelets in the analysis of signal singularities
Autorzy:
Rakowski, W.
Powiązania:
https://bibliotekanauki.pl/articles/330067.pdf
Data publikacji:
2015
Wydawca:
Uniwersytet Zielonogórski. Oficyna Wydawnicza
Tematy:
cubic box spline
wavelets
dyadic wavelet transform
singularity detection
falki
diadyczna transformacja falkowa
detekcja pojedyncza
Opis:
In the subject literature, wavelets such as the Mexican hat (the second derivative of a Gaussian) or the quadratic box spline are commonly used for the task of singularity detection. The disadvantage of the Mexican hat, however, is its unlimited support; the disadvantage of the quadratic box spline is a phase shift introduced by the wavelet, making it difficult to locate singular points. The paper deals with the construction and properties of wavelets in the form of cubic box splines which have compact and short support and which do not introduce a phase shift. The digital filters associated with cubic box wavelets that are applied in implementing the discrete dyadic wavelet transform are defined. The filters and the algorithme à trous of the discrete dyadic wavelet transform are used in detecting signal singularities and in calculating the measures of signal singularities in the form of a Lipschitz exponent. The article presents examples illustrating the use of cubic box spline wavelets in the analysis of signal singularities.
Źródło:
International Journal of Applied Mathematics and Computer Science; 2015, 25, 4; 927-941
1641-876X
2083-8492
Pojawia się w:
International Journal of Applied Mathematics and Computer Science
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Prefiltering in Wavelet Analysis Applying Cubic B-Splines
Autorzy:
Rakowski, W.
Powiązania:
https://bibliotekanauki.pl/articles/226902.pdf
Data publikacji:
2014
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
wavelet
scaling function
wavelet analysis
wavelet transform
cubic box spline
digital filters
direct cubic B-spline filter
prefiltering
Opis:
Wavelet transform algorithms (Mallat’s algorithm, a trous algorithm) require input data in the form of a sequence of numbers equal to the signal projection coefficients on a space spanned by integer-translated copies of a scaling function. After sampling of the continuous-time signal, it is most frequently possible to compute only approximated values of the signal projection coefficients by choosing a specific signal approximation. Calculation of the signal projection coefficients based on the signal interpolation by means of cubic B-splines is proposed in the paper.
Źródło:
International Journal of Electronics and Telecommunications; 2014, 60, 4; 331-340
2300-1933
Pojawia się w:
International Journal of Electronics and Telecommunications
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Real-time interpolation of streaming data
Autorzy:
Dębski, Roman
Powiązania:
https://bibliotekanauki.pl/articles/1839246.pdf
Data publikacji:
2020
Wydawca:
Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Wydawnictwo AGH
Tematy:
streaming algorithm
online algorithm
spline interpolation
cubic Hermite spline
Opis:
One of the key elements of the real-time C 1 -continuous cubic spline interpolation of streaming data is an estimator of the first derivative of the interpolated function that is more accurate than those based on finite difference schemas. Two such greedy look-ahead heuristic estimators, based on the calculus of variations (denoted as MinBE and MinAJ2), are formally defined (in closed form), along with the corresponding cubic splines that they generate. They are then comparatively evaluated in a series of numerical experiments involving different types of performance measures. The presented results show that the cubic Hermite splines generated by heuristic MinAJ2 significantly outperformed those that were based on finite difference schemas in terms of all of the tested performance measures (including convergence). The proposed approach is quite general. It can be directly applied to streams of univariate functional data like time-series. Multi-dimensional curves that are defined parametrically (after splitting) can be handled as well. The streaming character of the algorithm means that it can also be useful in processing data sets that are too large to fit in the memory (e.g., edge computing devices, embedded time-series databases).
Źródło:
Computer Science; 2020, 21 (4); 513-532
1508-2806
2300-7036
Pojawia się w:
Computer Science
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Spline interpolation for trap spectroscopy analysis for two cyclic hydrocarbons
Interpolacja z użyciem splajnów w zastosowaniu do spektroskopii pułapek dla analizy dwu cyklicznych węglowodorów
Autorzy:
Kania, S.
Kuliński, J.
Powiązania:
https://bibliotekanauki.pl/articles/296605.pdf
Data publikacji:
2015
Wydawca:
Politechnika Łódzka. Wydawnictwo Politechniki Łódzkiej
Tematy:
1-acenaphthenol
9,10-dimethylanthracene
conductivity
electrical characterization
trap spectroscopy
cubic spline
1-acenaftol
9,10-dimetyloantracen
przewodnictwo
charakterystyka elektryczna
spektroskopia pułapkowa
funkcje sklejane
Opis:
Cubic spline interpolation gives a tool for obtaining good image of current-voltage characteristics for trap spectroscopy analysis without prior assumption about the trap distribution for 1-acenaphthenol and 9,10-dimethylanthracene.
Interpolacja z wykorzystaniem splinów sześciennych daje dobre narzędzie dla uzyskiwania dobrych obrazów charakterystyk prądowo-napięciowych dla celów spektroskopii pułapkowej prowadzonej bez uprzedniego założenia o rozkładzie pułapek dla 1-acenaftenolu i 9,10-dimetyloantracenu.
Źródło:
Scientific Bulletin. Physics / Technical University of Łódź; 2015, 36; 27-38
1505-1013
2449-982X
Pojawia się w:
Scientific Bulletin. Physics / Technical University of Łódź
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Poprawa aproksymacji lokalnej średniej w rozkładzie na mody empiryczne dla celów detekcji uszkodzeń przekładni
Improvement of local mean approximation in empirical mode decomposition for gear fault detection
Autorzy:
Wang, Y.
Zuo, M. J.
Lei, Y.
Fan, X.
Powiązania:
https://bibliotekanauki.pl/articles/301082.pdf
Data publikacji:
2010
Wydawca:
Polska Akademia Nauk. Polskie Naukowo-Techniczne Towarzystwo Eksploatacyjne PAN
Tematy:
rozkład na mody empiryczne
interpolacja Hermite'a
funkcja sklejana 3-ego stopnia
aproksymacja średniej wartości obwiedni
okienkowana średnia lokalna
detekcja uszkodzeń przekładni
empirical mode decomposition
Hermite interpolation
cubic spline
envelope mean approximation
windowed local mean
gear fault detection
Opis:
Rozkład na mody empiryczne (EMD) to adaptacyjna metoda przetwarzania sygnału w połączonej dziedzinie czasu i częstotliwości, która jest całkowicie sterowana przez same dane. Metody interpolacji funkcjami sklejanymi trzeciego stopnia (cubic spline interpolation) używa się do aproksymacji średniej lokalnej w procesie przesiewu EMD. Niniejsza praca bada podejścia do poprawy aproksymacji średniej lokalnej w celu otrzymania lepszych charakterystyk EMD. Do aproksymacji średniej wartości obwiedni (envelope mean approximation) zastosowano metodę zmodyfi kowanej monotonicznej interpolacji Hermite'a funkcjami sklejanymi (modifi ed monotone piecewise Hermite interpolation, MMPHI), jako że wykazuje ona przewagę nad metodą funkcji sklejanych trzeciego stopnia. Zbadano również jeden z typów bezpośredniej aproksymacji lokalnej średniej, tzw. podejście okienkowanej średniej lokalnej (windowed local mean, WLM), i pokazano jego zalety w wykrywaniu impulsów.
Empirical mode decomposition (EMD) is an adaptive time-frequency domain signal processing method that is completely driven by data itself. The cubic spline interpolation method has been used to approximate the local mean in the sifting process of EMD. This study explores approaches to improve local mean approximation to obtain better EMD performance. A modifi ed monotone piecewise Hermite interpolation (MMPHI) method is applied to envelope mean approximation, because it demonstrates advantages over the cubic spline method. A type of direct approximation of the local mean, i.e., the windowed local mean (WLM) approach, is also investigated and its merit in identifying impulses is demonstrated.
Źródło:
Eksploatacja i Niezawodność; 2010, 2; 59-66
1507-2711
Pojawia się w:
Eksploatacja i Niezawodność
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
A numerical approximation of 2D coupled burgers’ equation using modified cubic trigonometric B-spline differential quadrature method
Autorzy:
Kapoor, Mamta
Joshi, Varun
Powiązania:
https://bibliotekanauki.pl/articles/2174173.pdf
Data publikacji:
2022
Wydawca:
Uniwersytet Zielonogórski. Oficyna Wydawnicza
Tematy:
równanie Burgersa
aerodynamika
fala uderzeniowa
differential quadrature method
Runge-Kutta 43 scheme
trigonometric B-spline
Opis:
In the present paper, trigonometric B-spline DQM is applied to get the approximated solution of coupled 2D non-linear Burgers’ equation. This technique, named modified cubic trigonometric B-spline DQM, has been used to obtain accurate and effective numerical approximations of the above-mentioned partial differential equation. For checking the compatibility of results, different types of test examples are discussed. A comparison is done between 2L and L∞ error norms with the previous, present results and with the exact solution. The resultant set of ODEs has been solved by employing the SSP RK 43 method. It is observed that the obtained results are improved compared to the previous numerical results in the literature.
Źródło:
International Journal of Applied Mechanics and Engineering; 2022, 27, 3; 79--102
1734-4492
2353-9003
Pojawia się w:
International Journal of Applied Mechanics and Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
An adaptive multi-spline refinement algorithm in simulation based sailboat trajectory optimization using onboard multi-core computer systems
Autorzy:
Dębski, R.
Powiązania:
https://bibliotekanauki.pl/articles/331021.pdf
Data publikacji:
2016
Wydawca:
Uniwersytet Zielonogórski. Oficyna Wydawnicza
Tematy:
dynamic programming
black-box optimization
heterogeneous computing
micro HPC platform
cubic Hermite splines
programowanie dynamiczne
obliczenia heterogeniczne
system komputerowy
Opis:
A new dynamic programming based parallel algorithm adapted to on-board heterogeneous computers for simulation based trajectory optimization is studied in the context of “high-performance sailing”. The algorithm uses a new discrete space of continuously differentiable functions called the multi-splines as its search space representation. A basic version of the algorithm is presented in detail (pseudo-code, time and space complexity, search space auto-adaptation properties). Possible extensions of the basic algorithm are also described. The presented experimental results show that contemporary heterogeneous on-board computers can be effectively used for solving simulation based trajectory optimization problems. These computers can be considered micro high performance computing (HPC) platforms—they offer high performance while remaining energy and cost efficient. The simulation based approach can potentially give highly accurate results since the mathematical model that the simulator is built upon may be as complex as required. The approach described is applicable to many trajectory optimization problems due to its black-box represented performance measure and use of OpenCL.
Źródło:
International Journal of Applied Mathematics and Computer Science; 2016, 26, 2; 351-365
1641-876X
2083-8492
Pojawia się w:
International Journal of Applied Mathematics and Computer Science
Dostawca treści:
Biblioteka Nauki
Artykuł
    Wyświetlanie 1-13 z 13

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