Christian Clason: Vorträge

Konferenzen
Seminare

Konferenzen

Iterative regularization of nonsmooth ill-posed problems,
12th International Scientific Conference and Young Scientist School "Theory and Computational Methods for Inverse and Ill-posed Problems", Novosibirsk, Akademgorodok, October 4-10, 2020 (online).
Convex relaxation of hybrid discrete-continuous control problems,
SIGOPT 2020 International Conference on Optimization, TU Dortmund, March 4-6, 2020.
Multibang regularization of a coefficient inverse problem for the wave equation,
Computational Methods for New Directions in Inverse Problems, Texas A&M University, College Station, TX, USA, February 3-5, 2020.
Convex relaxation of hybrid discrete-continuous control problems,
First Indo-German Conference on Computational Mathematics, Indian Institute of Science, Bangalore, India, December 2-4, 2019.
Iterative regularization for nonsmooth inverse problems,
1st Alps-Adriatic Inverse Problems Workshop, Klagenfurt, Austria, November 7-8, 2019.
Optimal control of nonsmooth equations,
Workshop "New Trends in PDE-Constrained Optimization", Special Semester on Optimization, RICAM Linz, Austria, November 14-18, 2019.
Optimal control of the principal coefficient in a scalar wave equation,
19th French-German-Swiss Conference on Optimization, Nice, France, September 17-20, 2019.
Discrete material optimization for the wave equation,
International Conference on Continuous Optimization, Berlin, Germany, August 5-8, 2019.
Iterative regularization for nonsmooth inverse problems,
International Congress on Industrial and Applied Mathematics, Valencia, Spain, July 15-19, 2019.
Iterative regularization of non-smooth equations,
Applied Inverse Problems Conference, Grenoble, France, July 8-12, 2019.
Multibang regularization of a coefficient inverse problem for the wave equation,
Applied Inverse Problems Conference, Grenoble, France, July 8-12, 2019.
Accelerated primal-dual methods for structured non-convex optimization,
International Conference on Stochastic Optimization and Related Topics, Mülheim an der Ruhr, Germany, April 26-26, 2019.
Multibang regularization of a coefficient inverse problem for the wave equation,
"Workshop “Mathematical and Numerical Approaches for Multi-Wave Inverse Problems”, CIRM, Marseille, France, April 1-5, 2019.
Iterative regularization of non-smooth equations,
Workshop "Numerical Methods for Optimal Control and Inverse Problems", Technische Universität München, Germany, March 11-13, 2019.
Accelerated primal-dual methods for PDE-constrained optimization,
International Workshop on PDE-constrained Optimization, Optimal Control, and Applications , Tsinghua Sanya International Mathematics Forum, Hainan, China, December 10-14, 2018.
Bouligand-Landweber iteration for a non-smooth ill-posed problem,
COPDESC Workshop "Analysis, Control and Inverse Problems for PDEs", Napoli, Italy, November 26-30, 2018.
Convex regularization of discrete-valued inverse problems,
2018 Joint Meeting of the Korean Mathematical Society and the German Mathematical Society., Seoul, Korea, October 3-6, 2018.
Bouligand-Landweber iteration for a non-smooth ill-posed problem,
VI Latin American Workshop on Optimization and Control, Quito, Ecuador, September 3-7, 2018.
Bouligand-Landweber iteration for a non-smooth ill-posed problem,
27th IFIP TC7 Conference on System Modelling and Optimization, Essen, Germany, July 23-27, 2018.
Convex regularization of discrete-valued inverse problems,
Inverse Problems: Modeling and Simulation, Mellieha, Malta, May 21-25, 2018.
Total variation regularization of multi-material topology optimization,
7th International Conference on High Performance Scientific Computing", Hanoi, Vietnam, March 19-23, 2018.
Design of optimal RF pulses for NMR as a discrete-valued control problem,
9th Vienna International Conference on Mathematical Modelling, TU Wien, Vienna, Austria, February 21-23, 2018.
Convex regularization of discrete-valued inverse problems,
Workshop "New Trends in Parameter Identification for Mathematical Models", IMPA, Rio de Janeiro, Brazil, October 30-November 3, 2017.
Total variation regularization of multi-material topology optimization,
IFIP WG 7.2 Workshop "Optimal Control of Partial Differential Equations", Castro Urdiales, Spain, September 18-21, 2017.
Convex relaxation of hybrid discrete-continuous control problems,
19th ÖMG Congress and DMV Annual Meeting, Salzburg, Austria, September 11-15, 2017.
Convex regularization of discrete-valued inverse problems,
Workshop "Variational methods and effective algorithms for imaging and vision", Isaac Newton Institute, Cambridge, UK, September 4-8, 2017.
Discrete regularization of parameter identification problems,
Workshop "Computational Imaging and Tomography", Innsbruck, Austria, August 17-18, 2017.
Discrete regularization of parameter identification problems,
Applied Inverse Problems Conference, Hangzhou, China, May 29-June 2, 2017.
Adaptive discretization and first-order methods for nonsmooth inverse problems for PDEs,
Turing/LMS Workshop "Inverse Problems and Data Science", Edinburgh, UK, May 8-10, 2017.
Convex relaxation of hybrid discrete-continuous control problems,
Workshop "Numerical Methods for Optimal Control and Inverse Problems", Technische Universität München, Germany, April 5-7, 2017.
A primal-dual extragradient method for nonlinear inverse problems for PDEs,
Optimization Techniques for Inverse Problems III, Modena, Italy, September 19-21, 2016.
A nonlinear primal-dual extragradient method for nonsmooth PDE-constrained optimization,
IFIP Workshop "Optimal Control Meets Inverse Problems", Essen, September 5-9, 2016.
A nonlinear primal-dual extragradient method for nonsmooth PDE-constrained optimization,
5th International Conference on Continuous Optimization, Tokyo, Japan, August 8-11, 2016.
Nonsmooth optimization of partial differential equations,
XII International Conference Approximation and Optimization in the Caribbean, La Habana, Cuba, June 6-10, 2016.
A primal-dual extragradient method for nonlinear forward models in function spaces,
SIAM Conference on Imaging Science, Albuquerque, New Mexico, May 23-26, 2016.
Second-order analysis of pointwise subdifferentials and applications to nonsmooth optimization,
Workshop on Nonsmooth and Stochastic Optimization with Applications to Energy Management, WIAS, Berlin, May 10-12, 2016.
Stochastic inverse problems with impulsive noise,
SIAM Conference on Uncertainty Quantification, Lausanne, Switzerland, April 5-8, 2016.
Convex regularization of hybrid discrete-continuous inverse problems,
International Workshop on Recent Developments in Inverse Problems, Berlin, Germany, September 17-18, 2015.
Convex regularization of hybrid discrete-continuous inverse problems,
8th International Congress on Industrial and Applied Mathematics, Beijing, China, August 10-14, 2015.
A primal-dual extragradient method for nonsmooth nonlinear inverse problems for PDEs,
International Conference on Inverse Problems, Imaging, and Applications, Hangzhou, China, August 6-8, 2015.
A primal-dual extragradient method for nonlinear operators in function spaces,
27th IFIP TC7 Conference, Sophia Antipolis, France, June 29-July 3, 2015.
A convex analysis approach to multi-material topology optimization,
International Workshop "From Open to Closed Loop Control", Mariatrost, Austria, June 22-26, 2015.
Stochastic inverse problems with impulsive noise,
Applied Inverse Problems Conference, Helsinki, Finland, May 25-29, 2015.
A convex analysis approach to switching control of PDEs,
International Conference on Inverse Problems and Optimal Control, Hong Kong, China, December 4-6, 2014.
Stochastic inverse problems with impulsive noise,
Chemnitz Symposium on Inverse Problems, Chemnitz, Germany, September 18-19, 2014.
Convex relaxation of hybrid binary-continuous problems,
Inverse Problems - from Theory to Application, Bristol, UK, August 26-28, 2014.
Avoiding degeneracy in the Westervelt equation by state constrained optimal control,
10th AIMS Conference on Dynamical Systems, Differential Equations and Applications, Madrid, Spain, July 7-11, 2014.
A convex analysis approach to hybrid binary-continuous optimal control problems with application to switching control,
10th AIMS Conference on Dynamical Systems, Differential Equations and Applications, Madrid, Spain, July 7-11, 2014.
Multi-bang control of elliptic equations,
SIAM Conference on Optimization, San Diego, California, May 19-22, 2014.
Multi-bang control of elliptic equations,
Workshop "Numerical Methods for Optimal Control and Inverse Problems", Technische Universität München, Germany, March 3-5, 2014.
Sparse controls for elliptic and parabolic partial differential equations,
1st IFAC Workshop on Control of Systems Modeled by PDEs, Paris, France, September 25-27, 2013.
Parameter identification problems with uniform noise,
26th IFIP TC7 Conference, Klagenfurt, Austria, September 8-13, 2013.
Multi-bang control of elliptic systems,
4th International Conference on Continuous Optimization, Lisboa, Portugal, July 29-August 1, 2013.
Parameter identification problems with uniform noise,
3rd European Conference on Computational Optimization, Chemnitz, Germany, July 17-19, 2013.
Coefficient inverse problems with uniform noise,
Applied Inverse Problems Conference, Daejeon, South Korea, July 1-5, 2013.
Optimal control of elliptic PDEs with positive measures,
Workshop "Numerical Methods for Optimal Control and Inverse Problems", Technische Universität München, Germany, March 11-13, 2013.
Parameter identification with non-Gaussian noise,
Oberwolfach Workshop "Computational Inverse Problems", Mathematisches Forschungsinstitut Oberwolfach, Germany, October 22-26, 2012.
Inverse problems for PDEs with uniform noise,
21st International Symposium on Mathematical Programming, Berlin, Germany, August 20-24, 2012.
Inverse problems for PDEs with L-infinity data fitting,
Inverse Problems: Modeling and Simulation, Antalya, Turkey, May 21-25, 2012.
Inverse problems with uniform noise,
Workshop "Numerical Methods for Optimal Control and Inverse Problems", Technische Universität München, Germany, March 12-14, 2012.
A measure space approach to optimal source placement,
Workshop "Optimization with PDE constraints", Charles University Prague, Czech Republic, December 9-10, 2011.
Variational methods for image reconstruction in magnetic resonance imaging,
Dagstuhl Seminar "Efficient Algorithms for Global Optimisation Methods in Computer Vision", Schloss Dagstuhl, Germany, November 20-25, 2011.
Minimum effort optimal control of elliptic PDEs,
25th IFIP TC 7 Conference, Berlin, Germany, September 12-16, 2011.
A measure space approach to optimal source placement,
25th IFIP TC 7 Conference, Berlin, Germany, September 12-16, 2011.
Autocalibrated parameter choice for non-smooth noise models,
Applied Inverse Problems Conference, Texas A&M University, College Station, Texas, USA, May 23-27, 2011.
L1 data fitting for parameter identification problems for PDEs,
Applied Inverse Problems Conference, Texas A&M University, College Station, Texas, USA, May 23-27, 2011.
Parameter identification problems for PDEs with L1 data fitting,
SIAM Conference on Optimization, Darmstadt, Germany, May 16-19, 2011.
Optimal source placement as an optimal control problem in measure spaces,
82nd Annual Meeting of the GAMM, Graz, Austria, April 18-21, 2011.
L1 data fitting for nonlinear inverse problems,
Chemnitz Symposium on Inverse Problems, Chemnitz, Germany, September 23-24, 2010.
Total variation regularized nonlinear inversion for parallel MRI with variable density sampling patterns,
Workshop on Novel Reconstruction Strategies in NMR and MRI, Göttingen, Germany, September 9-11, 2010.
[movies (mp4): slide 22, slide 23]
Inverse source problems with L1-type penalties,
Inverse Problems: Modeling and Simulation, Antalya, Turkey, May 20-24, 2010.
Optimal control of PDEs with measures,
Annual Meeting of the DMV, München, Germany, March 8-12, 2010.
A semismooth Newton method for optimal control problems in a measure space,
14th Belgian-French-German Conference on Optimization, Leuven, Belgium, September 14-18, 2009.
Inverse problems with L1 data fitting,
Applied Inverse Problems Conference, Wien, Austria, July 20-24, 2009.
A predual formulation for PDE constrained optimization with total variation regularization,
Optimization with PDE Constraints (OPTPDE), Warsaw, Poland, December 11-13, 2008.
A direct method for the numerical time reversal of waves in a heterogeneous medium,
6th International Congress on Industrial and Applied Mathematics (ICIAM), Zürich, Switzerland, July 16-20, 2007.
A non-standard numerical method for variational data assimilation for a convection-diffusion equation,
Applied Inverse Problems Conference, Vancouver, Canada, June 25-29, 2007.
The quasi-reversibility method for thermoacoustic tomography in a heterogeneous medium,
Applied Inverse Problems Conference, Vancouver, Canada, June 25-29, 2007.

Kolloquia und Seminare

Optimal control of nonsmooth partial differential equations,
IFIP WG 7.2 Virtual Seminar, February 2, 2020.
Nonsmooth regularization of a coefficient inverse problem for the wave equation,
Mathematical Colloquium, Universidade Federal de Santa Catarina, Florianópolis, Brasil, October 30, 2020 (online).
Convex relaxation of hybrid discrete-continuous control problems,
Mathematisches Kolloquium, Heinrich-Heine-Universität Düsseldorf, December 13, 2019.
Multibang regularization of a coefficient inverse problem for the wave equation,
Forschungsseminar Inverse Probleme und PDEs, TU Chemnitz, September 3, 2019.
Accelerated primal--dual methods for structured non-convex optimization,
Computational and Applied Mathematics Seminar, Chalmers University of Technology, Göteborg, Sweden, August 28, 2019.
Generalized modes in Bayesian inverse problems,
Forschungsseminar Mathematische Statistik, Humbold-Universität Berlin, February 9, 2019.
Nichtglatte Optimierung im Funktionenraum,
Kolloquium Mathematik, Universität Paderborn, July 9, 2018.
Convex relaxation of hybrid discrete-continuous control problems,
Universität Paderborn, March 13, 2018.
Convex regularization of discrete-valued inverse problems,
Universiteit Twente, Enschede, Netherlands, September 27, 2017.
Convex relaxation of hybrid discrete-continuous control problems,
Universität Bayreuth, June 16, 2017.
Convex relaxation of hybrid discrete-continuous control problems,
Weierstraß-Institut für Angewandte Analysis und Stochastik, Berlin, March 29, 2017.
Stochastic inverse problems with impulsive noise,
Karl-Franzens-Universität Graz, March 15, 2017.
Discrete regularization of parameter identification problems,
Alpen-Adria-Universität Klagenfurt, November 16, 2016.
A primal-dual extragradient method for nonlinear inverse problems for PDEs,
Karl-Franzens-Universität Graz, September 28, 2016.
Discrete regularization of parameter identification problems,
University of Helsinki, August 25, 2016.
Discrete regularization of parameter identification problems,
University of Tokyo, August 12, 2016.
Convex relaxation of hybrid discrete-continuous regularization,
Fudan University, Shanghai, August 2, 2015.
Convex relaxation of hybrid discrete-continuous problems,
Sandia National Laboratories, Albuquerque, March 23, 2015.
Sparse optimization of PDEs with application to light source placement,
Kolloquium der FR Mathematik, Universität des Saarlandes, Saarbrücken, February 6, 2015.
Sparse optimization of PDEs with application to light source placement,
Colloquium Nonlinear Science, Westfälische Wilhelms-Universität Münster, January 27, 2015.
Convex relaxation of hybrid binary-continuous penalties,
Westfälische Wilhelms-Universität Münster, November 19, 2014.
Sparse optimization of PDEs with application to light source placement,
University College London, October 10, 2014.
Wieviel Mathematik steckt im "Kernspin"?,
WissensNacht Ruhr, Essen, October 2, 2014.
Nichtglatte Optimierung im Funktionenraum,
Duisburger Arbeitskreis für Mathematik in Forschung und Praxis, May 27, 2014.
A convex analysis approach to hybrid binary-continuous optimal control problems,
University of California, Riverside, May 23, 2014.
A convex analysis approach to hybrid binary-continuous optimal control problems,
Cambridge University, April 28, 2014.
A convex analysis approach to hybrid binary-continuous optimal control problems with application to multi-bang controls,
Institut für Mathematik, Alpen-Adria-Universität Klagenfurt, January 14, 2014.
Multi-bang control of elliptic equations,
Zentrum Mathematik, Technische Universität München, December 17, 2013.
Parameter identification problems with non-Gaussian noise,
Lothar Collatz Colloquium, Universität Hamburg, May 16, 2013.
Numerische Optimierung im Maßraum,
Universität Bayreuth, April 17, 2013.
Numerische Optimierung im Maßraum,
Humboldt-Universität zu Berlin, February 11, 2013.
Parameter identification problems with non-Gaussian noise,
University of Tokyo, January 24, 2013.
Parabolic control problems in measure spaces,
Julius-Maximilians-Universität Würzburg, June 5, 2012.
Parameteridentifizierung mit Impulsrauschen,
Universität Duisburg-Essen, January 27, 2012.
Inverse problems with non-smooth noise models,
Helmholtz Zentrum München, October 27, 2011.
A semi-smooth Newton method for nonlinear inverse problems with L1 data fitting,
RICAM, Linz, February 18, 2011.
A primal-dual semi-smooth Newton method for nonlinear L1 data fitting,
Institute of Computational Mathematics and Scientific/Engineering Computing, Chinese Academy of Sciences, Beijing, August 24, 2010.
PDE-constrained optimization with L1-type functionals,
Institute of Computational Mathematics and Scientific/Engineering Computing, Chinese Academy of Sciences, Beijing, August 18, 2010.
PDE-constrained optimization with L1-type functionals,
Universität Konstanz, April 14, 2010.
Inverse problems with L1 data fitting: A semismooth Newton method and automatic parameter choice,
Johannes-Kepler Universität Linz, July 13, 2009.
Basic Principles of (P)MRI,
Karl-Franzens-Universität Graz, December 3, 2008.
(very informal; animations missing; caution: ~7MB)
Time Reversal and Thermoacoustic Tomography,
Georg-August-Universität Göttingen, October 30, 2007.
A direct method for the numerical time reversal of waves in a heterogeneous medium,
Karl-Franzens-Universität Graz, May 2, 2007.
A direct method for the numerical time reversal of waves in a heterogeneous medium,
RICAM, Linz, March 6, 2007.