Thematic presentations
Faculty of Engineering, Stellenbosch University, Stellenbosch, South Africa
ENLIGHT-TRANSMATH meeting: building networks in Harmonic Analysis and PDEs, Bilbao, Spain
Computing Science and Mathematics Seminar, University of Stirling, Scotland, UK
American Conference on Pharmacometrics (ACop13), Aurora, Colorado, USA (poster presentation)
BIRS-Banff Workshop "New Ideas in Computational Inverse Problems", BIRS, Banff, Canada, October 26, 2022
International Conference on Multivariate Approximation and Interpolation with Applications (MAIA 2022), Reinhardwaldschule, Fuldatal, Germany
International Conference on Multivariate Approximation and Interpolation with Applications (MAIA 2022), Reinhardwaldschule, Fuldatal, Germany
International Conference on Multivariate Approximation and Interpolation with Applications (MAIA 2022), Reinhardwaldschule, Fuldatal, Germany
International Conference on Multivariate Approximation and Interpolation with Applications (MAIA 2022), Reinhardwaldschule, Fuldatal, Germany
International Conference on Multivariate Approximation and Interpolation with Applications (MAIA 2022), Reinhardwaldschule, Fuldatal, Germany
University of Stirling, Scotland, UK
University of Stirling, Scotland, UK
Katholische Universität Eichstatt-Ingolstadt, Ingolstadt (Germany)
ICIAM Workshop on Industrial and Applied Mathematics, University of Strathclyde, Glasgow, Scotland, UK
Minisymposium "Matrix Functions, Operator Functions, and Related Approximation Methods”, SIAM Annual Meeting 2022, Pittsburgh, USA (online)
Minisymposium "Recent Advancements in the Mathematics of Materials", AWM Research Symposium, U. MN, Minneapolis
Workshop on Neural Networks and Deep Learning, Fields Institute for Research in Mathematical Sciences, Toronto, Canada
Department of Computer Science, Universiteit Antwerpen, Belgium
ASTRON, Dwingeloo, The Netherlands
ASTRON, Dwingeloo, The Netherlands
Applied Mathematics and Computation Seminar, Oregon State University, Oregon, USA
Minisymposium "Advances in Optimization for Image Processing: New Applications, Algorithms and Theory”, SIAM Conference on Imaging Science (IS22), Berlin, Germany (online)
Rhein-Ruhr Workshop, Bestwig, Germany
South African Mathematical Society (SAMS), virtual online meeting
Workshop on the Intersections of Computation and Optimisations, Canberra, Australia (online)
Conference on Numerical Methods and Scientific Computing, Centre International de Rencontres Mathématiques (CIRM), Luminy, France
Conference on Numerical Methods and Scientific Computing, Centre International de Rencontres Mathématiques (CIRM), Luminy, France
NMSC21, CIRM Luminy campus (France)
Woudschoten Conference, Zeist, Netherlands (poster presentation)
Start of the EXPOWER project : OCT 1 2021
Universiteit Antwerpen, Department of Computer Science
Applications of Computer Algebra (ACA), virtual online meeting
University of Stirling, Division of Computing Science and Mathematics
Multi-exponential analysis might sound remote, but it touches our lives in many surprising ways, even if most people are unaware of just how important it is. For example, a substantial amount of effort in the field of signal processing is essentially dedicated to the analysis of multi-exponential functions whose exponents are complex. The analysis of exponential functions whose exponents are very near each other is directly linked to superresolution imaging. Read More
ICIAM 2019, Valencia (Spain)
SIAM AG 2019, Bern (Switzerland)
National Taiwan Normal University, Taipei, Taiwan
University of Stirling, Division of Computing Science and Mathematics
The talk will start with a brief introduction of US NSF's 10 Big Ideas and give an overview of the recent trend of computational mathematics in the US. Then I will present my own research topic which will serve as an example to demonstrate how a problem in composite materials can be studied from the computational mathematics point of view. Read More
CASC2018, Lille (France)
University of Stirling, Division of Computing Science and Mathematics
Integer matrices are often characterized by the lattice of combinations of their rows or columns. This is captured nicely by the Smith canonical form, a diagonal matrix of invariant factors, to which any integer matrix can be transformed through left and right multiplication by unimodular matrices. Algorithms for computing Smith forms have seen dramatic improvements over the past 40 years, but effective algorithms for large sparse matrices still need improvement. Read More
CUNY graduate center (poster session), New York, USA
Curves and surfaces, Arcachon (France)
Georg-August-Universität Göttingen, Institute for Numerical and Applied Mathematics
We consider the task of updating a matrix function f(A) when the matrix A ∈ Cnxn is subject to a low-rank modification. In other words, we aim at approximating f(A+D)-f(A) for a matrix D of rank k ≪ n. The approach proposed in this talk attains efficiency by projecting onto tensorized Krylov subspaces produced by matrix-vector multiplications with A and A*. Read More
Euronoise 2018 (poster session), Crete (Greece)
Georg-August-Universität Göttingen, Institute for Numerical and Applied Mathematics
Estimating the spectral information of an exponential sum plays an important role in many signal processing applications. In particular, we mention nuclear magnetic resonance (NMR) spectroscopy and the direction of arrival (DOA) problem in smart antenna technology. We present a parametric method that can circumvent the Shannon-Nyquist sampling rate and break the curse of dimensionality. Read More
Universiteit Antwerpen, Department of Mathematics and Computer Science
Universiteit Antwerpen, Department of Mathematics and Computer Science
In signal processing data are traditionally sampled according to the Shannon-Nyquist theorem in order to prevent aliasing effects. Here we focus on parametric methods and introduce a procedure that allows these methods to work with sub-sampled data. We actually make use of the aliasing effect to regularize the problem statement rather than that we avoid it. Read More
Georg-August-Universität Göttingen, Institute for Numerical and Applied Mathematics
Rational functions like for instance Padé approximants play an important role in signal processing, sparse interpolation and exponential analysis. They have good theoretical properties in approximation and modeling. However, for a successful modeling with help of rational functions we want to make sure that there is no ”similar” rational function being degenerate, i.e., having strictly smaller degree of both degrees of numerator and denominator. Read More
ECCOMAS 2016, Heraklion, Crete (Greece)
Université de Lille
Université des Sciences et Technologies de Lille - Lille I
Reconstructing a digital signal from its measurements is an inverse problem that can be extremely ill-posed. Meanwhile, sampling a signal uniformly below the Shannon-Nyquist rate leads to aliasing, an unwanted effect causing different signals to become indistinguishable. Read More
Universiteit Antwerpen, Department of Mathematics and Computer Science
Rational functions like for instance Padé approximants play an important role in signal processing, sparse interpolation and exponential analysis. However, for a successful modeling with help of rational functions we want to make sure that there is no ”similar” rational function being degenerate, i.e., having strictly smaller degree of both degrees of numerator and denominator. Read More
Universiteit Antwerpen, Department of Mathematics and Computer Science
Padé approximants play an important role in signal processing, sparse interpolation and exponential analysis. In this talk we will report about recent results concerning the forward and backward conditioning of the (real) Padé map, which sends a vector of Taylor coefficients onto the normalized vector of coefficients of the Padé numerator and denominator. Read More
Department of Mathematical Sciences, University of Delaware
Universiteit Antwerpen, Department of Mathematics and Computer Science
We derive a new generalization of Prony's method to reconstruct M-sparse expansions of (generalized) eigenfunctions of linear operators from only O(M) suitable values in a deterministic way. Read More
Schloss Dagstuhl, Saarbrücken (Germany)
Georg-August-Universität Göttingen,
Institute for Numerical and Applied Mathematics
Tutorials
Start of the EXPOWER project : OCT 1 2021
5th Algorithmic and Enumerative Combinatorics Summer School 2019, Hagenberg, Austria
Series of five research lectures for graduate students and researchers.
Research Training Group 2088, Georg-August-Universität Göttingen
Computer Algebra in Scientific Computing (CASC 2017)
A mathematical model is called sparse if it is a combination of only a few non-zero terms. In sparse interpolation, the aim is to determine both the support of the sparse linear combination and the scalar coefficients in the representation, from a small or minimal amount of data samples. Read More
Dolomites Research Week on Approximation (DRWA14)
Within the last time, various adaptive methods for signal and image approximation have been suggested. Instead of choosing a priori a basis or a frame to approximate an image, one tries to adapt the approximation scheme to the image geometry. Read More
Dolomites Research Week on Approximation (DRWA14)
Throughout computational science and engineering, several attempts have been made to represent data in a parsimonious way. Mathematical models are proposed in which the major features of the data are represented using only a few terms, in other words, models that use a sparse combination of generating elements instead of a linear combination of all basis elements. Read More
Summer School on Applied Analysis 2013 (CMS13)
A crucial problem in data analysis is to construct efficient low-level representations of mathematical objects from discrete signal data while preserving characteristic properties of the target object. In recent years, many ideas have been developed to design adaptive approximation schemes for signals and images taking into account some a-priori knowledge about their structure. Read More
Organized meetings
International Conference on Multivariate Approximation and Interpolation with Applications (MAIA)
Reinhardswald Schule, Hessische Lehrkräfteakademie, Fuldatal, Germany
London Mathematical Society: Female Leadership in Mathematical Sciences
University of Stirling, Scotland, UK
Dagstuhl Seminar 22221: Exponential Analysis: Theoretical Progress and Technological Innovation
Schloss Dagstuhl, Dagstuhl, Germany
EXPOWER Ice Breaker Event
ASTRON, Dwingeloo, The Netherlands
Minisymposium "Recovering Algebraic Structures in Imaging & Signal Processing”
SIAM conference on Imaging Science (IS22)
Numerical Methods and Scientific Computing
Centre International de Recontres Mathématiques, Luminy, France
Start of the EXPOWER project : OCT 1 2021
Research Training Group 2088: Sparse Approximation with Exponential Sums and Applications
Georg-August-Universität Göttingen, Germany
Mecklenburg Workshop: Approximation Methods and Fast Algorithms
Schloss Hasenwinkel, Germany
International conference on Approximation and Matrix Functions (amf18)
Université de Lille, France
SIAM conference on Applied Algebraic Geometry (SIAM AG 17): Minisymposium "From Approximation Theory to Tensor Decomposition"
Georgia Institute of Technology, Atlanta, Georgia, USA
CMO Workshop 16w5038: Sparse Interpolation, Rational Approximation and Exponential Analysis
Casa Matemática Oaxaca, Mexico
Fields Institute Sponsored Workshop on Milestones in Computer Algebra
University of Waterloo, Canada
5èmes Journées Approximation, International conference on constructive complex approximation
Université des Sciences et Technologies de Lille - Lille I, France
Dagstuhl Seminar 15251: Sparse Modelling and Multi-exponential Analysis
Schloss Dagstuhl, Dagstuhl, Germany
Research visits
October 26-28, 2022
Visit of David Li (Strathclyde University, UK) and Tomas Sauer (University of Passau, Germany) to Universiteit Antwerpen.
October 10-23, 2021
Visit of Annie Cuyt (Universiteit Antwerpen, Belgium) to University of Florence
February 17-25, 2020
Visit of Wen-shin Lee (University of Stirling) to Universiteit Antwerpen.
January 27-31, 2020
Annie Cuyt (Universiteit Antwerpen) to University of Stirling.
January 4-12, 2020
Visit of George Labahn (University of Waterloo) to Université de Lille
November 3-8, 2019
Annie Cuyt (Universiteit Antwerpen) to University of Stirling
September 30 - October 4, 2019
Visit of Wen-shin Lee (University of Stirling) to Universiteit Antwerpen
September 5, 2019
Visit of Dirk de Villiers (Stellenbosch University, South Africa) to Universiteit Antwerpen
September 1-5, 2019
Visit of Rina-Mari Weideman (Stellenbosch University, South Africa) to Universiteit Antwerpen
March 23 - April 2, 2019
Visit of George Labahn (University of Waterloo) to Université de Lille
March 22-27, 2019
Visit of Wen-shin Lee (University of Stirling) to Universiteit Antwerpen
November 26-30, 2018
Visit of Annie Cuyt (Universiteit Antwerpen, Belgium) to Georg-August-Universität Göttingen
October 18-26, 2018
Visit of Wen-shin Lee (University of Stirling) to Universiteit Antwerpen
September 24-28, 2018
Visit of Yvonne Ou (University of Delaware) to University of Stirling
September 10-14, 2018
Visit of Mark Giesbrecht (University of Waterloo) to University of Stirling
May 1-3, 2018
Visit of Dirk de Villiers (Stellenbosch University, South Africa) to ASTRON
April 30, 2018
Visit of Dirk de Villiers (Stellenbosch University, South Africa) to Universiteit Antwerpen
December 21-22, 2017
Visit of Gerlind Plonka-Hoch (Georg-August-Universität Göttingen, Germany) to Universiteit Antwerpen
September 19, 2016 - February 17, 2017
Several visits of Ridalise Louw (Stellenbosch University, South-Africa) to Universiteit Antwerpen
May 15-17, 2017
Visit of Ana Matos (Université des Sciences et Technologies de Lille - Lille I, France) to Georg-August-Universität Göttingen
January 21-28, 2017
Visit of George Labahn (University of Waterloo) to Université de Lille
September 19, 2016 - February 17, 2017
Visit of Ridalise Louw (Stellenbosch University, South Africa) (Erasmus Mundus) to Universiteit Antwerpen
April 15-20, 2016
Visit of George Labahn (University of Waterloo) to Université de Lille
November 11-12, 2015
Visit of Bernhard Beckermann and Ana C. Matos (Université des Sciences et Technologies de Lille - Lille I, France) to Universiteit Antwerpen
October 19-21, 2015
Visit of Gerlind Plonka-Hoch (Georg-August-Universität Göttingen, Germany) to Universiteit Antwerpen
January 18-21, 2015
Visit of Annie Cuyt (Universiteit Antwerpen, Belgium) to Georg-August-Universität Göttingen