Results 41 to 50 of about 14,248 (263)

An Ultra-Precise Fast Fourier Transform

SSRN Electronic Journal, 2022
The Fast Fourier Transform (FFT) is a cornerstone of digital signal processing, generating a computationally efficient estimate of the frequency content of a time series. Its limitations include: (1) information is only provided at discrete frequency steps, so further calculation, for example interpolation, may be required to obtain improved estimates ...
openaire   +4 more sources

A Fast Fourier Transform for the Johnson Graph

Journal of Fourier Analysis and Applications, 2022
21 pages, 8 figures.
Rodrigo Iglesias, Mauro Natale
openaire   +2 more sources

Modeling Dislocation Cutting of γ′ Precipitates in Ni‐Base Superalloys: Linking Atomistic and Dislocation Dynamics Simulations

Advanced Engineering Materials, EarlyView.
Dislocation cutting of γ′ precipitates in Ni‐based superalloys is investigated by linking atomistic simulations with discrete dislocation dynamics. The critical cutting stress is shown to be governed by the antiphase boundary energy, while line tension effects promote edge‐preferred cutting.
Frédéric Houllé, Siwen Gao, Marc Fivel, Anxin Ma, Daria Smirnova, Sriram Anand, Arun Prakash, Julien Guénolé, Alexander Hartmaier, Erik Bitzek   +9 more
wiley   +1 more source

Number-Theoretic Transforms: Theory and Applications in Modern Cryptography

IEEE Access
Number-theoretic transforms (NTT) provide exact arithmetic and efficient convolution over finite algebraic structures, and have emerged as a foundational computational primitive in modern cryptography.
Juliano B. Lima, Jose R. De Oliveira Neto   +1 more
doaj   +1 more source

A Practical Noise2Noise Denoising Pipeline for High‐Throughput Raman Spectroscopy

Advanced Engineering Materials, EarlyView.
A lightweight and reproducible denoising pipeline for high‐throughput Raman spectroscopy is introduced, based on a 1D convolutional autoencoder trained with a Noise2Noise strategy. Using only repeated short‐exposure acquisitions, the method suppresses stochastic noise without reference spectra, enabling reliable spectral reconstruction while preserving
David Martin‐Calle, Cesar Alvarez‐Llamas, Vincent Motto‐Ros, Christophe Dujardin, Jérémie Margueritat, David Rodney   +5 more
wiley   +1 more source

Calculation Scheme Based on a Weighted Primitive: Application to Image Processing Transforms

EURASIP Journal on Advances in Signal Processing, 2007
This paper presents a method to improve the calculation of functions which specially demand a great amount of computing resources. The method is based on the choice of a weighted primitive which enables the calculation of function values under the scope ...
Gregorio de Miguel Casado, Higinio Mora Mora, Juan Manuel García Chamizo, María Teresa Signes Pont   +3 more
doaj   +2 more sources

SFDiff: Diffusion model with sufficient spatial‐Fourier frequency information interaction for low‐light image enhancement

IET Image Processing
Diffusion models are increasingly applied in low‐light image enhancement tasks due to their exceptional capability to model data distributions, but most current methods focus only on the original pixel space and neglect the potential of Fourier frequency
Fei Wan, Bingxin Xu, Jingli Yao, Lu Zeng, Weiguo Pan, Hongzhe Liu   +5 more
doaj   +1 more source

Accelerating the Nonuniform Fast Fourier Transform [PDF]

SIAM Review, 2004
Summary: The nonequispaced Fourier transform arises in a variety of application areas, from medical imaging to radio astronomy to the numerical solution of partial differential equations. In a typical problem, one is given an irregular sampling of \(N\) data in the frequency domain and one is interested in reconstructing the corresponding function in ...
Leslie Greengard, June-Yub Lee
openaire   +2 more sources

Extrusion‐Based Additive Manufacturing of Advanced Ceramics: Strengthening Mechanisms and Process Optimization Review

Advanced Engineering Materials, EarlyView.
This review comprehensively evaluates extrusion‐based additive manufacturing for advanced ceramics, detailing feedstock options and key process parameters. By critically addressing defect mechanisms like porosity and cracking, the work highlights optimization strategies through machine learning and advanced postprocessing.
Meisam Bakhtiari, Mohammad Hadi Sheikh‐Ansari, Avinash Borgaonkar, Mehran Dadkhah, Abdollah Saboori   +4 more
wiley   +1 more source

Chaotic synchronization of vibrations of a coupled mechanical system consisting of a plate and beams

Latin American Journal of Solids and Structures
In this paper mathematical model of a mechanical system consisting of a plate and either one or two beams is derived. Obtained PDEs are reduced to ODEs, and then studied mainly using the fast Fourier and wavelet transforms.
J. Awrejcewicz, A.V. Krysko, T.V. Yakovleva, D.S. Zelenchuk, V.A. Krysko   +4 more
doaj   +1 more source