Results 71 to 80 of about 26,813 (231)

Optimal solutions to matrix-valued Nehari problems and related limit theorems

, 2011
In a 1990 paper Helton and Young showed that under certain conditions the optimal solution of the Nehari problem corresponding to a finite rank Hankel operator with scalar entries can be efficiently approximated by certain functions defined in terms of ...
AE Frazho, AE Frazho, BA Francis, C Foias, C Foias, C Foias, D Sarason, H Bart, I Gohberg, I Gohberg, JW Helton, MJ Corless, S Horst ter, S Horst ter, VM Adamjan, VV Peller   +15 more
core   +2 more sources

A weakly stable algorithm for general Toeplitz systems

, 1995
We show that a fast algorithm for the QR factorization of a Toeplitz or Hankel matrix A is weakly stable in the sense that R^T.R is close to A^T.A. Thus, when the algorithm is used to solve the semi-normal equations R^T.Rx = A^Tb, we obtain a weakly ...
A. Griewank, A.N. Kolmogorov, A.W. Bojanczyk, A.W. Bojanczyk, A.W. Bojanczyk, A.W. Bojanczyk, A.W. Bojanczyk, Adam W. Bojanczyk, B.R. Musicus, C.-T. Pan, C.C. Paige, C.H. Bischof, D.J. Higham, D.R. Sweet, D.R. Sweet, D.R. Sweet, E.H. Bareiss, F.R. Hoog de, F.T. Luk, Frank R. de Hoog, G. Cybenko, G. Cybenko, G. Heinig, G. Heinig, G. Szegö, G.A. Watson, G.H. Golub, G.H. Golub, G.H. Golub, G.S. Ammar, G.W. Stewart, G.W. Stewart, G.W. Stewart, H. Sexton, I. Schur, J. Chun, J. Chun, J. Dongarra, J. Jankowski, J. Rissanen, J.G. Nagy, J.H. Wilkinson, J.H. Wilkinson, J.H. Wilkinson, J.M. Varah, J.R. Bunch, J.R. Bunch, M. Gentleman, M.A. Saunders, M.H. Gutknecht, M.H. Gutknecht, M.H. Gutknecht, N. Gould, N. Levinson, N. Wiener, P.C. Hansen, P.E. Gill, R. Fletcher, R.D. Skeel, R.P. Brent, R.P. Brent, R.R. Bitmead, R.W. Freund, R.W. Freund, R.W. Freund, Richard P. Brent, S. Qiao, S. Zohar, T. Kailath, T. Kailath, T. Kailath, T. Kailath, T.F. Chan, T.F. Chan, W. Miller, W.F. Trench, Å. Björck   +76 more
core   +2 more sources

The Hankel matrix rank theorem revisited

Linear Algebra and its Applications, 2017
zbMATH Open Web Interface contents unavailable due to conflicting licenses.
openaire   +3 more sources

Reproducibility of Metabolic Mapping Using 2D Multi‐Slice Short‐TE and GABA‐Edited Spin‐Echo MRSI at 3T in a Single Protocol

NMR in Biomedicine, Volume 39, Issue 1, January 2026.
Short‐TE MRSI at 3T enables reproducible metabolic mapping for tNAA, tCr, tCho, mI, and Glx; however, GABA+ mapping with edited MRSI remains challenging due to susceptibility to intermittent subject motion. Although 96% of regions from the short‐TE MRSI met quality control for major metabolites for at least one visit, only 82.5% of voxels of the GABA ...
Helge J. Zöllner, Dillip K. Senapati, İpek Özdemir, Kimberly L. Chan, Georg Oeltzschner, Doris D. M. Lin, Peter B. Barker   +6 more
wiley   +1 more source

Missing Data Imputation in GNSS Monitoring Time Series Using Temporal and Spatial Hankel Matrix Factorization [PDF]

, 2022
Hanlin Liu, Linchao Li
openalex   +1 more source

Gradient Scheme Optimization for PRESS‐Localized Edited MRS Using Weighted Pathway Suppression

NMR in Biomedicine, Volume 39, Issue 1, January 2026.
This study presents an optimized DOTCOPS‐based gradient scheme for PRESS‐localized edited MRS that integrates a volume‐based likelihood model to prioritize suppression of unwanted coherence transfer pathways. Using a dual‐penalty genetic algorithm, the scheme achieved a 197% increase in k‐space crushing efficiency and significantly reduced out‐of‐voxel
Gizeaddis L. Simegn, Zahra Shams, Saipavitra Murali‐Manohar, Dunja Simicic, Abdelrahman Gad, Yulu Song, Vivek Yedavalli, Christopher W. Davies‐Jenkins, Aaron T. Gudmundson, Helge J. Zöllner, Georg Oeltzschner, Richard A. E. Edden   +11 more
wiley   +1 more source

Robust and Efficient Harmonics Denoising in Large Dataset Based on Random SVD and Soft Thresholding

IEEE Access, 2019
The Hankel matrix of harmonic signals has the important low-rank property, based on which the principal components (or the eigenvectors) extracted from the matrix by singular value decomposition (SVD) could be applied for harmonic signal denoising ...
Yu Yang, Jian Rao
doaj   +1 more source

Decentralised and Centralised Fixed Structure H∞ Robust Loop Shaping for the MIMO Microsurgical Manipulation Based on PSOGSA

IET Control Theory &Applications, Volume 20, Issue 1, January/December 2026.
This paper presents a robust H∞ decentralised and centralised control approach for a microsurgical manipulator using Particle Swarm Optimisation and Gravitational Search Algorithm (PSOGSA). The proposed fixed‐structure Proportional‐Integral‐Derivative (PID)‐based controllers address implementation challenges of conventional high‐order H∞ controllers ...
Somyot Kaitwanidvilai, Poom Konghuayrob, Hisayuki Aoyama   +2 more
wiley   +1 more source

Combinatorics on number walls and the P(t)$P(t)$‐adic Littlewood conjecture

Mathematika, Volume 72, Issue 1, January 2026.
Abstract In 2004, de Mathan and Teulié stated the p$p$‐adic Littlewood conjecture (p$p$‐LC) in analogy with the classical Littlewood conjecture. Let Fq$\mathbb {F}_q$ be a finite field P(t)$P(t)$ be an irreducible polynomial with coefficients in Fq$\mathbb {F}_q$. This paper deals with the analogue of p$p$‐LC over the ring of formal Laurent series over
Steven Robertson
wiley   +1 more source

State space model realization using step response data of MIMO system with input delays for model predictive control [PDF]

Acta Periodica Technologica, 2019
This paper discusses state space realization algorithm from general multiple input multiple output (MIMO) step response data with or without input delays.
Jimoh Mohammed T., Dan’Isa Ado
doaj   +1 more source