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    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:
    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:
    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:
    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:
    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:
    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:
    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
      Wyświetlanie 1-10 z 10

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