Results 251 to 260 of about 3,849,710 (299)
Some of the next articles are maybe not open access.
Probabilistic Scaling for the Numerical Inversion of Nonprobability Transforms
INFORMS Journal on Computing, 1997It is known that probability density functions and probability mass functions usually can be calculated quite easily by numerically inverting their transforms (Laplace transforms and generating functions, respectively) with the Fourier-series method. Other more general functions can be substantially more difficult to invert, because the aliasing and ...
Gagan L. Choudhury, Ward Whitt
openaire +2 more sources
A Numerical Method for the Inverse Stochastic Spectrum Problem
SIAM Journal on Matrix Analysis and Applications, 1998This paper concerns the construction of a stochastic matrix with a prescribed spectrum. The present ``flow approach'' is based on a differential equation to obtain the steepest descent flow for reducing the distance (given, say, in terms of the Frobenius norm) between isospectral matrices and nonnegative matrices.
Moody T. Chu, Quanlin Guo
openaire +1 more source
FireFlow: Fast Inversion of Rectified Flow for Image Semantic Editing
International Conference on Machine LearningThough Rectified Flows (ReFlows) with distillation offers a promising way for fast sampling, its fast inversion transforms images back to structured noise for recovery and following editing remains unsolved.
Yingying Deng +4 more
semanticscholar +1 more source
An Inverse Problem for the $k$-Rank Numerical Range
SIAM Journal on Matrix Analysis and Applications, 2016Summary: For an \(n \times n\) matrix \(A\) and an integer \(k \in [1,n]\), the concept of the higher rank numerical range \(\Lambda_k(A)=\left\{z \in \mathbb{C}:V^*AV=zI_k, \; V \in \mathbb{C}^{n \times k}, \; V^*V=I_k\right\}\) has been introduced in relation to the study of error correcting codes and has been extensively studied.
Georgios Katsouleas, John Maroulas
openaire +2 more sources
Numerical Solution of a Subsurface Imaging Inverse Problem
SIAM Journal on Applied Mathematics, 2001Summary: A new solution method for an inverse problem for the two-dimensional Helmholtz equation is developed. The underlying application area which motivated this work is the imaging of land mines using ground penetrating radar, formulated as an inverse problem for the Helmholtz equation.
Yuriy A. Gryazin +2 more
openaire +1 more source
Review of Physics-Informed Machine Learning Inversion of Geophysical Data
GeophysicsWe review five types of physics-informed machine learning (PIML) algorithms for inversion and modeling of geophysical data. Such algorithms use the combination of a data-driven machine learning (ML) method and the equations of physics to model and/or ...
Gerard T. Schuster +2 more
semanticscholar +1 more source
Numerical methods for elliptic inverse problems
International Journal of Computer Mathematics, 1998Identifying physical parameters in elliptic boundary value problems is formulated as a constrained minimization problem using the output least squares method with the H l-regularization or the BV-regularization. The constrained minimization problem is then discretized by finite element methods and the discretization is shown to be convergent for both ...
openaire +1 more source
A Numerical Approach to the Inverse Toeplitz Eigenproblem
SIAM Journal on Scientific and Statistical Computing, 1988The author proposes an iterative procedure for the inverse Toeplitz eigenproblems: diagonalize the current approximation \(T_ k\) to the required matrix to determine the corresponding matrix of eigenvectors \(Q_ k\), then construct \(T_{k+1}\) as the Toeplitz matrix which has the given eigenvalues as its Rayleigh quotients associated with the ...
openaire +1 more source
Numerical inverse computation of reflectivity
High Power Laser and Particle Beams, 2013By analyzing the one-dimensional heat transfer equation under the heat flux boundary condition, a numerical method for inverse computation from the back surface temperature data to the front surface reflectivity data is proposed. The inversely computing program is verified by the positive and inverse computation of one-dimensional heat transfer.
金云声 Jin Yunsheng +6 more
openaire +1 more source
NUMERICAL TRANSFORM INVERSION FOR AUTOCORRELATIONS OF WAITING TIMES
2005The generating function of the autocorrelations of successive waiting times in a stationary M/G/l or in a stationary GI/M/1 system can be expressed in terms of the probability generating function of the number of customers served in a busy period. The latter function is only implicitly determined as a solution to a functional equation.
openaire +1 more source