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Tytuł:
Riesz-Laplace Wavelet Transform and PCNN Based Image Fusion
Autorzy:
Sun, Shuifa
Tang, Yongheng
Mei, Zhoujunshen
Yang, Min
Tang, Tinglong
Wu, Yirong
Powiązania:
https://bibliotekanauki.pl/articles/2204258.pdf
Data publikacji:
2023
Wydawca:
Szkoła Główna Gospodarstwa Wiejskiego w Warszawie. Instytut Informatyki Technicznej
Tematy:
image fusion
Riesz transforms
polyharmonic spline
Laplacian wavelet
pulse-coupled neural networks
PCNN
Opis:
Important information perceived by human vision comes from the low-level features of the image, which can be extracted by the Riesz transform. In this study, we propose a Riesz transform based approach to image fusion. The image to be fused is first decomposed using the Riesz transform. Then the image sequence obtained in the Riesz transform domain is subjected to the Laplacian wavelet transform based on the fractional Laplacian operators and the multi-harmonic splines. After Laplacian wavelet transform, the image representations have directional and multi-resolution characteristics. Finally, image fusion is performed, leveraging Riesz-Laplace wavelet analysis and the global coupling characteristics of pulse coupled neural network (PCNN). The proposed approach has been tested in several application scenarios, such as multi-focus imaging, medical imaging, remote sensing full-color imaging, and multi-spectral imaging. Compared with conventional methods, the proposed approach demonstrates superior performance on visual effects, contrast, clarity, and the overall efficiency.
Źródło:
Machine Graphics & Vision; 2023, 32, 1; 73--84
1230-0535
2720-250X
Pojawia się w:
Machine Graphics & Vision
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:
Estimating the confidence interval of the regression coefficient of the blood sugar model through a multivariable linear spline with known variance
Autorzy:
Islamiyati, Anna
Raupong, Raupong
Kalondeng, Anisa
Sari, Ummi
Powiązania:
https://bibliotekanauki.pl/articles/2019723.pdf
Data publikacji:
2022-03-15
Wydawca:
Główny Urząd Statystyczny
Tematy:
confidence interval
diabetes
known variance
spline
Opis:
Estimates from confidence intervals are more powerful than point estimates, because there are intervals for parameter values used to estimate populations. In relation to global conditions, involving issues such as type 2 diabetes mellitus, it is very difficult to make estimations limited to one point only. Therefore, in this article, we estimate confidence intervals in a truncated spline model for type 2 diabetes data. We use a non-parametric regression model through a multi-variable spline linear estimator. The use of the model results from the irregularity of the data, so it does not form a parametric pattern. Subsequently, we obtained the interval from beta parameter values for each predictor. Body mass index, HDL cholesterol, LDL cholesterol and triglycerides all have two regression coefficients at different intervals as the number of the found optimal knot points is one. This value is the interval for multivariable spline regression coefficients that can occur in a population of type 2 diabetes patients.
Źródło:
Statistics in Transition new series; 2022, 23, 1; 201-212
1234-7655
Pojawia się w:
Statistics in Transition new series
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Reverse engineering in modeling agricultural products
Inżynieria odwrotna w modelowaniu produktów rolniczych
Autorzy:
Boryga, Marek
Kołodziej, Paweł
Powiązania:
https://bibliotekanauki.pl/articles/2204301.pdf
Data publikacji:
2022
Wydawca:
Polskie Towarzystwo Inżynierii Rolniczej
Tematy:
reverse engineering
3D scan
interpolation spline
projection of root geometry
sugar beet
inżynieria odwrotna
skan 3D
splajn interpolacyjny
odwzorowanie geometrii korzenia
burak cukrowy
Opis:
The purpose of the study was to use reverse engineering to model biological products, especially sugar beet root. In the process of creating the solid model, the appropriate tools available in the 3D design environment were applied. The 3D scan of the beet, in the form of a spatial point cloud, was used to project the root geometry. This was, in turn, used to construct a triangulation grid that includes nodal points of triangles. The subsequent steps presented the process of creating a solid model using the Interpolation Spline tool. Attention has been paid to the possibility of modifying the geometry by inserting additional points into the existing interpolation spline and changing angular position as well as the distance of the structural planes. Geometry mapping error values were determined with regard to the reference model depending on the spread value of the Structural Planes. Error courses are non-linear with a logarithmic line trend (surface field error) and a linear line trend (volume error). The effects demonstrated the usefulness of geometry projection and its applicability to support the strength testing of biological materials, with particular emphasis on dynamic tests using whole roots.
Celem pracy było zastosowanie inżynierii odwrotnej do modelowania produktów pochodzenia biologicznego a w szególności korzenia buraka cukrowego. W procesie tworzenia modelu bryłowego wykorzystano odpowiednie narzędzia jakimi dysponuje środowisko do projektowania 3D. Pomocą w odwzorowaniu geometrii korzenia był trójwymiarowy skan buraka stanowiący przestrzenną chmurę punktów. Posłużyła ona do budowy siatki triangulacyjnej obejmującej punkty węzłowe trójkątów. W kolejnych krokach przedstawiono przebieg tworzenia modelu bryłowego za pomocą narzędzia Splajn interpolacyjny. Zwrócono uwagę na możliwości modyfikacji odtwarzania geometrii poprzez wprowadzanie kolejnych dodatkowych punktów do istniejącego Splajnu interpolacyjnego oraz zmiany położenia kątowego jak również odległości Płaszczyzn konstrukcyjnych. Wyznaczono wartości błędów odwzorowania geometrii w odniesieniu do modelu referencyjnego w zależności od wartości rozstawienia Płaszczyzn konstrukcyjnych. Przebiegi błędów mają charakter nieliniowy z logarytmiczną linią tredu - błąd pola powierzchni oraz z liniową linią tredu - błąd objętości. Na podstawie uzykanych efektów wykazano przydatność odtwarania geometrii i możliwość jej zastosowania do wspomagania badań wytrzymałościowych materiałów biologicznych ze szczególnym uwzględnieniem testów dynamicznych z wykorzystaniem całych korzeni.
Źródło:
Agricultural Engineering; 2022, 26, 1; 105--117
2083-1587
Pojawia się w:
Agricultural Engineering
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 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:
Axisymmetric free vibration of layered cylindrical shell filled with fluid
Autorzy:
Izyan, M. D. Nurul
Sabri, Nur Ain Ayunni
Hafizah, A. K. Nor
Sankar, D. S.
Viswanathan, K. K.
Powiązania:
https://bibliotekanauki.pl/articles/2106463.pdf
Data publikacji:
2021
Wydawca:
Uniwersytet Zielonogórski. Oficyna Wydawnicza
Tematy:
drgania swobodne
powłoka cylindryczna
efekt Love'a
axisymmetric
free vibration
cylindrical shell
Love’s first approximation theory
inviscid fluid
spline approximation
eigenvalues
Opis:
The aim of the study is to analyse the axisymmetric free vibration of layered cylindrical shells filled with a quiescent fluid. The fluid is assumed to be incompressible and inviscid. The equations of axisymmetric vibrations of layered cylindrical shell filled with fluid, on the longitudinal and transverse displacement components are obtained using Love’s first approximation theory. The solutions of displacement functions are assumed in a separable form to obtain a system of coupled differential equations in terms of displacement functions. The displacement functions are approximated by Bickley-type splines. A generalized eigenvalue problem is obtained and solved numerically for a frequency parameter and an associated eigenvector of spline coefficients. Two layered shells with three different types of materials under clamped-clamped boundary conditions are considered. Parametric studies are made on the variation of the frequency parameter with respect to length-to-radius ratio and length-to-thickness ratio.
Źródło:
International Journal of Applied Mechanics and Engineering; 2021, 26, 4; 63--76
1734-4492
2353-9003
Pojawia się w:
International Journal of Applied Mechanics and Engineering
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:
Numerical solution of singularly perturbed two parameter problems using exponential splines
Autorzy:
Padmaja, P.
Aparna, P.
Gorla, Rama Subba Reddy
Pothanna, N.
Powiązania:
https://bibliotekanauki.pl/articles/1839837.pdf
Data publikacji:
2021
Wydawca:
Uniwersytet Zielonogórski. Oficyna Wydawnicza
Tematy:
przepływ ciepła
wartość graniczna
katalizator
singular perturbation
convection-diffusion problems
exponential spline
numerical convergence
Opis:
In this paper, we have studied a method based on exponential splines for numerical solution of singularly perturbed two parameter boundary value problems. The boundary value problem is solved on a Shishkin mesh by using exponential splines. Numerical results are tabulated for different values of the perturbation parameters. From the numerical results, it is found that the method approximates the exact solution very well.
Źródło:
International Journal of Applied Mechanics and Engineering; 2021, 26, 2; 160-172
1734-4492
2353-9003
Pojawia się w:
International Journal of Applied Mechanics and Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Shifter mechanism design for FSAE motor sports vehicle JCU
Autorzy:
Wheatley, Greg
Ali, Ahmed
Powiązania:
https://bibliotekanauki.pl/articles/2091242.pdf
Data publikacji:
2021
Wydawca:
Politechnika Śląska. Wydawnictwo Politechniki Śląskiej
Tematy:
mechanical shifter
solid linkage
spline attachments
FEA
mechaniczna skrzynia biegów
trwałe połączenie
mocowanie wielowypustowe
MES
Opis:
This report provides a design analysis of a replacement’s shifter mechanism for the 2014 model JCU Motorsports FSAE vehicle. Common FSAE shifter mechanisms were researched and reviewed to provide a better understanding of the needs required. A design approach was constructed to ultimately design a mechanism that conformed to all existing constraints and FSAE rules. Realistic load cases were identified and employed in the FEA analysis of the design. Supporting hand calculations were developed, proving the analysis to be accurate. Results showed the shifter mechanism does not fail under infinite life, with some parts of the design having a reasonably high safety factor, ensuring stability.
Źródło:
Zeszyty Naukowe. Transport / Politechnika Śląska; 2021, 113; 219--229
0209-3324
2450-1549
Pojawia się w:
Zeszyty Naukowe. Transport / Politechnika Śląska
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Uniqueness of series in the Franklin system and the Gevorkyan problems
Autorzy:
Wronicz, Zygmunt
Powiązania:
https://bibliotekanauki.pl/articles/2050933.pdf
Data publikacji:
2021
Wydawca:
Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Wydawnictwo AGH
Tematy:
Franklin system
orthonormal spline system
uniqueness of series
Opis:
In 1870 G. Cantor proved that if $lim_{N \to \infty} \Sigma_{n=-N}^{N}c_{n}e^{i n x} = 0, \overline{c}_{n} = c_{n}$, then $c_{n} = 0$ for $n \in \mathbb{Z}$. In 2004 G. Gevorkyan raised the issue that if Cantor’s result extends to the Franklin system. He solved this conjecture in 2015. In 2014 Z. Wronicz proved that there exists a Franklin series for which a subsequence of its partial sums converges to zero, where not all coefficients of the series are zero. In the present paper we show that to the uniqueness of the Franklin system $\Sigma_{n=0}^{\infty} a_{n}f_{n}$ it suffices to prove the convergence its subsequence $s_{2^{n}}$ to zero by the condition $a_{n} = o(\sqrt{n})$. It is a solution of the Gevorkyan problem formulated in 2016.
Źródło:
Opuscula Mathematica; 2021, 41, 2; 269-276
1232-9274
2300-6919
Pojawia się w:
Opuscula Mathematica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Missing-data imputation using wearable sensors in heart rate variability
Autorzy:
Tlija, A.
Węgrzyn-Wolska, K.
Istrate, D.
Powiązania:
https://bibliotekanauki.pl/articles/200516.pdf
Data publikacji:
2020
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
data imputation
spline interpolation
linear interpolation
HRV
IoT
Opis:
The objective of this work is to set up a methodology that considers missing data from a connected heartbeat sensor in order to propose a good replacement methodology in the context of heart rate variability (HRV) computation. The framework is a research project, which aims to build a system that can measure stress and other factors influencing the onset and development of heart disease. The research encompasses studying existing methods, and improving them by use of experimental data from case study that describe the participant’s everyday life. We conduct a study to modelize stress from the HRV signal, which is extracted from a heart rate monitor belt connected to a smart watch. This paper describes data recording procedure and data imputation methodology. Missing data is a topic that has been discussed by several authors. The manuscript explains why we choose spline interpolation for data values imputation. We implement a random suppression data procedure and simulate removed data. After that, we implement several algorithms and choose the best one for our case study based on the mean square error.
Źródło:
Bulletin of the Polish Academy of Sciences. Technical Sciences; 2020, 68, 2; 255-261
0239-7528
Pojawia się w:
Bulletin of the Polish Academy of Sciences. Technical Sciences
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
New Unconventional Processes of Plastic Forming of the Internal Toothing of Coupling Spline Sleeves
Autorzy:
Michalczyk, J.
Wiewiórowska, S.
Powiązania:
https://bibliotekanauki.pl/articles/351013.pdf
Data publikacji:
2020
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
forging
extrusion
spline sleeves
Opis:
The article explores the possibility of using the authors’ three new methods of unconventional extrusion of deep hollows to be used for the manufacture of spline sleeves intended for internal toothing couplings. Two invention patents, PL206466 and PL224121, and one patent application, P.416772, were used for this purpose. Numerical computations were made in the Forge®3D program for the conceptual schemes of forming sleeves. The aim of those computations was to determine the extrusion forces and to compare them with the conventional indirect and direct extrusion methods. Then, on models based on the authors’ plastic forming schemes, numerical computations were made, from which the actual energy and force parameters were determined in the form of the relationship of extrusion force versus forming tool path. Also, the degree of fill of the passes, in which spline sleeve toothing is formed, was determined.
Źródło:
Archives of Metallurgy and Materials; 2020, 65, 1; 229-236
1733-3490
Pojawia się w:
Archives of Metallurgy and Materials
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:
Thermomechanical Analysis of the Possibility of Using New Methods of Complex Extrusion for Manufacturing the Inner Toothing of Spline Sleeves
Autorzy:
Michalczyk, J.
Wiewiórowska, S.
Powiązania:
https://bibliotekanauki.pl/articles/355393.pdf
Data publikacji:
2020
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
complex extrusion
spline sleeves
forging gear
new method extrusion
Opis:
In the paper presents two new patented of unconventional methods author’s and sleeve-type products of extruding [PL219182, PL221425]. The extrusion methods have been developed with the aim of reducing the energy and force parameters during the plastic forming of material. Traditional methods of extruding similar products are characterized by considerably higher extrusion force magnitudes. This results in substantial limitations and problems of an engineering nature. Moreover, the proposed methods of producing bottomed and bottomless sleeves are distinguished by the capability to minimize or totally eliminate the waste. The author’s methods of extruding long bottomless sleeves, presented herein, were used for developing a method for shaping inner toothing in spline sleeves. The theoretical analysis is based on thermomechanical simulation of the possibility of applying such processes to the extrusion of spline shafts with inner toothing. Next, the obtained results were compared with analogous parameters for classical indirect extrusion. The possibility of shaping inner toothing over the entire product length according to the proposed spline sleeve plastic forming methods was also explored.
Źródło:
Archives of Metallurgy and Materials; 2020, 65, 4; 1447-1453
1733-3490
Pojawia się w:
Archives of Metallurgy and Materials
Dostawca treści:
Biblioteka Nauki
Artykuł

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