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- Institute for Quantum Optics and Quantum Information InnsbruckAT973 papers
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7 papers · 2 filters
Convergence rates of recursive Newton-type methods for multifrequency scattering problems
Mourad Sini, Nguyen Trung Thành
We are concerned with the reconstruction of a sound-soft obstacle using far field measurements of the scattered waves associated with incident plane waves sent from one direction b…
Efficient algorithms for discrete Gabor transforms on a nonseparable lattice
Christoph Wiesmeyr, Nicki Holighaus, Peter L. Soendergaard
The Discrete Gabor Transform (DGT) is the most commonly used transform for signal analysis and synthesis using a linear frequency scale. It turns out that the involved operators ar…
A variational algorithm for the detection of line segments
E. Beretta, M. Grasmair, M. Muszkieta +1
In this paper we propose an algorithm for the detection of edges in images that is based on topological asymptotic analysis. Motivated from the Mumford--Shah functional, we conside…
Discretized Tikhonov regularization for Robin boundaries localization
Hui Cao, Sergei V. Pereverzev, Eva Sincich
We deal with a boundary detection problem arising in nondestructive testing of materials. The problem consists in recovering an unknown portion of the boundary, where a Robin condi…
Algebraic Multilevel Preconditioning in Isogeometric Analysis: Construction and Numerical Studies
K. P. S. Gahalaut, S. K. Tomar, J. K. Kraus
We present algebraic multilevel iteration (AMLI) methods for isogeometric discretization of scalar second order elliptic problems. The construction of coarse grid operators and hie…
Robust Algebraic multilevel preconditioning in and
S. K. Tomar
An algebraic multilevel iteration method for solving system of linear algebraic equations arising in and spaces are presented. The algorithm is…