Results 71 to 80 of about 1,649 (181)

Every Matrix is a Product of Toeplitz Matrices [PDF]

Foundations of Computational Mathematics, 2015
18 ...
Ye, Ke, Lim, Lek-Heng
openaire   +3 more sources

Visual Training Induced Temporo‐Occipital Fast Sleep Spindle Clustering in Humans Revealed by Full‐Night HD‐EEG Recordings

Journal of Sleep Research, Volume 35, Issue 1, February 2026.
ABSTRACT This study investigates the impact of extensive visual procedural training on the temporal organisation of sleep spindles in healthy young adults. We selected 39 participants aged 16–20 and employed high‐density electroencephalography to assess spindle characteristics during two full nights of sleep, with daytime practising in a contour ...
Patrícia Gerván, Gábor Bocskai, Andrea Berencsi, Ferenc Gombos, Ilona Kovács   +4 more
wiley   +1 more source

On Toeplitz matrices construction algorithm with a given number of connected components of the limitary spectrum complement^[1]

Advanced Engineering Research, 2015
The simplest topological properties of the approximate spectrum, namely the connectivity of its complement in the complex plane, are studied. A numerical verification of the lower bounds for the maximum number of the connected components of the limitary ...
Svetlana A. Zolotykh
doaj   +1 more source

Modeling and Forecasting Stochastic Seasonality: Are Seasonal Autoregressive Integrated Moving Average Models Always the Best Choice?

Journal of Forecasting, Volume 45, Issue 1, Page 316-334, January 2026.
ABSTRACT In this paper, we study models for stochastic seasonality and compare the well‐known SARIMA models to Seasonal Autoregressive Unit Root Moving Average (SARUMA) models. SARUMA models assume that the polynomial of the stationarizing differencing operator has roots on the unit circle at some seasonal frequencies, while SARIMA models impose roots ...
Evangelos E. Ioannidis, Sofia‐Eirini Nikolakakou   +1 more
wiley   +1 more source

Steady‐State Spread Bounds for Graph Diffusion via Laplacian Regularisation in Networked Systems

IET Networks, Volume 15, Issue 1, January/December 2026.
We study how an engineered initial pattern on a fixed network blurs under linear diffusion and provide a steady‐state upper bound on the resulting deviation. The bound cleanly separates an unavoidable floor set by network connectivity and diffusion strength from a design‐controlled term that shrinks when the initial pattern is smoothed with a graph ...
Ardavan Rahimian
wiley   +1 more source

Ultra‐Short‐Term Wind Speed Prediction Based on Information Aggregation With Spatial Decoupling in Turbine Cluster Space

IET Renewable Power Generation, Volume 20, Issue 1, January/December 2026.
Core approach: hybrid model combining wake dynamics, spectral clustering and adaptive neighbourhood selection. Methodology: spatial decoupling → representative turbine identification → feature aggregation via memory network. Outcome: enhanced prediction accuracy validated by real‐data comparisons, addressing spatial correlation challenges in wind farms.
Xiaofeng Zhu, Zhenxin Li, Chenghan Hou, Shoukun Zou   +3 more
wiley   +1 more source

Design and Optimization of Finite Alphabet Waveforms for Multiple‐Antenna Radar Covariance Matching

IET Radar, Sonar &Navigation, Volume 20, Issue 1, January/December 2026.
This article propose a novel method for finite‐alphabet waveform generation based on constrained matrix decomposition. It also expands theoretical feasibility bounds for generating covariance matrices with binary waveforms, proves that matrices from autoregressive processes are always realizable and introduces an optimal adjustment procedure for ...
Karim Saifullin, Sajid Ahmed, Mohamed‐Slim Alouini   +2 more
wiley   +1 more source

Fast numerical algorithms for solving opposite-bordered tridiagonal Toeplitz linear systems and their applications

Results in Applied Mathematics
This paper presents two fast numerical algorithms for solving opposite-bordered tridiagonal Toeplitz linear systems. Both algorithms are designed to solve a system of n equations in linear time.
Hcini Fahd
doaj   +1 more source

Digital Signal Processing (DSP)-Oriented Reduced-Complexity Algorithms for Calculating Matrix–Vector Products with Small-Order Toeplitz Matrices

Signals
Toeplitz matrix–vector products are used in many digital signal processing applications. Direct methods for calculating such products require N2 multiplications and N(N−1) additions, where N denotes the order of the Toeplitz matrix.
Janusz P. Papliński, Aleksandr Cariow, Paweł Strzelec, Marta Makowska   +3 more
doaj   +1 more source

CHARACTERIZATIONS OF MATRIX-VALUED ASYMMETRIC TRUNCATED TOEPLITZ OPERATORS

Rocky Mountain Journal of Mathematics
We characterize matrix-valued asymmetric truncated Toeplitz operators (which are compressions of multiplication operators acting between two possibly different model spaces) by using compressed shifts, modified compressed shifts and shift invariance.
Khan, Rewayat, Ameur, Yagoub, Khan, Jamroz   +2 more
openaire   +3 more sources