Results 41 to 50 of about 23,965 (163)

Uncertainty in structure dynamics resulting from matrix ill-conditioning

Archives of Acoustics, 2014
In the paper there are discussed certain issues concerning ill-posed problems that frequently appear in inverse problems, modal analysis, acoustics and other methods making use of matrix algebra.
J. IWANIEC
doaj  

Nonautonomous ill-posed evolution problems with strongly elliptic differential operators

Electronic Journal of Differential Equations, 2013
In this article, we consider the nonautonomous evolution problem $du/dt=a(t)Au(t), 0leq sleq t< T$ with initial condition $u(s)=chi$ where -A generates a holomorphic semigroup of angle $heta in (0,pi/2]$ on a Banach space X and $ain C([0,T]:mathbb{R}^+
Matthew A. Fury
doaj  

Physics‐Informed Estimation of Tidal and Subtidal Flow Fields From ADCP Repeat Transect Data

Water Resources Research
Acoustic Doppler current profilers (ADCPs) are a global standard in observing flow fields in rivers, estuaries and the coastal ocean. To date, it remains a labor intensive challenge to isolate mean flow fields governed by river discharge, tides and ...
H. Jongbloed, B. Vermeulen, A. J. F. Hoitink   +2 more
doaj   +1 more source

A simplified homotopy perturbation method for solving nonlinear ill-posed operator equations in Hilbert spaces

Journal of Numerical Analysis and Approximation Theory
One popular regularization technique for handling both linear and nonlinear ill-posed problems is homotopy perturbation. In order to solve nonlinear ill-posed problems, we investigate an iteratively-regularized simplified version of the Homotopy ...
Sharad Kumar Dixit
doaj   +1 more source

A Generalized Tikhonov Regularization Using Two Parameters Applied to Linear Inverse Ill-Posed Problems

Revista de Ciencias, 2007
A Generalized Tikhonov Regularization Using Two Parameters Applied to Linear Inverse Ill-Posed ...
Doris Hinestroza, Luisa Fernanda Vargas
doaj   +1 more source

On the ill-posed problem for the Poisson equation

Қарағанды университетінің хабаршысы. Математика сериясы, 2018
A boundary value problem in a two - dimensional rectangular region for the Poisson equation is studied in the paper. The original ill - posed boundary value problem is transformed to the optimal control problem.
M.T. Jenaliyev, M.M. Amangaliyeva, K.B. Imanberdiyev   +2 more
doaj   +1 more source

DETERMINATION OF SELECTED PARAMETERS IN A 1D OPEN CHANNEL FLOW MODEL

TASK Quarterly, 2007
Determination of the model’s parameters is an important stage of mathematical models’ application. In the case of a free-surface 1D unsteady flow model defined by the de Saint-Venant equations, one of the groups of parameters to be estimated is the set ...
KATARZYNA WEINEROWSKA-BORDS
doaj  

Parameter Choice Strategy That Computes Regularization Parameter before Computing the Regularized Solution

Modelling
The modeling of many problems of practical interest leads to nonlinear ill-posed equations (for example, the parameter identification problem (see the Numerical section)).
Santhosh George, Jidesh Padikkal, Ajil Kunnarath, Ioannis K. Argyros, Samundra Regmi   +4 more
doaj   +1 more source

A modified truncation singular value decomposition method for solving ill-posed problems

Journal of Algorithms & Computational Technology, 2018
A modified truncated singular value decomposition method for solving ill-posed problems is presented in this paper, in which the solution has a slightly different form.
Zhenyu Zhao, Riguang Lin, Zehong Meng, Guoqiang He, Lei You, Yongxiong Zhou   +5 more
doaj   +1 more source

Learning phase diversity for solving ill-posed inverse problems in imaging

JPhys Photonics
Inverse problems in imaging are typically ill-posed and are solved using regularized optimization techniques or - in recent times, by employing deep neural networks.
Jasleen Birdi, Tamal Majumder, Debanjan Halder, Muskan Kularia, Kedar Khare   +4 more
doaj   +1 more source