Prof. Dr.
Ronny Ramlau
Managing Scientific Director
Group Leader
Transfer Group
http://www.indmath.uni-linz.ac.at/index.php/members/27-ramlau
Contact
Email: Ronny.Ramlau(at)oeaw.ac.at
Telephone: +43 732 2468 4101
Biographical sketch
- born on July 23, 1966 in Annaberg-Buchholz, Germany
- 1988/1994 Study of Mathematics at University of Potsdam, Germany
- 1994: Diploma in Mathematics, University of Potsdam, Germany
- 1997: Ph.D. in Mathematics, University of Potsdam, Germany
- 2003: Habilitation, University of Bremen, Germany
FORMER AND CURRENT POSITIONS
- 1994-1997: Research Assistant, University of Potsdam, Germany
- 1998 : Visiting Scholar, University of Salt Lake City, USA
- 1999-2005: Research Assistant, University of Bremen, Germany
- September-December 2003: Visiting scholar, Institute for Pure and Applied Mathematics (IPAM), UCLA, USA
- September 2005 - August 2008: Senior Scientist in the group "Inverse Problems" at the RICAM
- Since September 2008: Professor for Industrial Mathematics, Johannes Kepler University Linz
- 03/2013-09/2014: Acting Director at RICAM
- 10/2014-04/2015: Scientific Director at RICAM
- 05/2015-07/2016: Managing Scientific Director at RICAM
- 08/2016-2/2019: Scientific Director at RICAM
- 03/2019-02/2021: Managing Scientific Director at RICAM
Research Projects
ESO - In-Kind Project: Mathematical Algorithms and Software for E-ELT Adaptive Optics
FWF Project P19496-N18: Inverse Problems with Sparsity Constraints.
Project scientist: DI. S. Anzengruber,
Project runtime: 15.06.2007 - 15.06.2010
FWF Project P20237-N14: Mathematical methods for high-precision balancing of machine-tools.
Project scientist: Dr. J. Niebsch
Project runtime: 01.01.2008 - 31.12.2010
Doktoral Program Computational Mathematics: Project Nonlinear regularization methods for the solution of linear ill-posed problems
Project runtime: 1.10. 2008 - 30.09.2011
Project Scientist: Dipl. math. I. Bleyer
FFG Project Modellbasierte Umwuchtbestimmung in Windenergieanlagen
Project Runtime: 01.01.2009 - 31.12.2011
Research interests
- nonlinear inverse problems
- inverse problems in astronomy
- regularization methods
- iterative methods
- medical imaging
- mathematical methods in industry
Publications
Journal Publication (123)
- Weissinger, Lukas; Hubmer, Simon; Ramlau, Ronny; Voss, Henning Uwe (2025) An Inverse Problems Approach to Pulse Wave Analysis in the Human Brain. SIAM Journal on Imaging Sciences, Bd. 18 (1), S. 60-88.
- Ramlau, Ronny; Stadler, Bernadett (2024) On some analytic properties of the atmospheric tomography operator: Non-Uniqueness and reconstructability issues. Inverse Problems and Imaging, Bd. Early Access, S. 19.
- Li, Xinyan; Hubmer, Simon; Lu, Shuai; Ramlau, Ronny (2024) Regularization of linear inverse problems with irregular noise using embedding operators. SIAM Journal on Imaging Sciences, Bd. 17 (4), S. 2053-2075.
- Bernadett Stadler, Roberto Biasi, Mauro Manetti, Andreas Obereder, Ronny Ramlau and Matteo Tintori (2024) High fidelity adaptive mirror simulations with reduced order models. Journal of Mathematics in Industry, Bd. 14, S. 20.
- Zheng, Dihan; Tang, Shiqi; Wagner, Roland; Ramlau, Ronny; Bao, Chenglong et al. [..] (2024) PhaseNet: A Deep Learning Based Phase Reconstruction Method for Ground-Based Astronomy. SIAM Journal on Imaging Sciences, Bd. 17 (3), S. 1511-1538.
- Rannetbauer, Wolfgang; Hubmer, Simon; Hambrock, Carina; Ramlau, Ronny (2024) Predictive modelling of critical variables for improving HVOF coating using gamma regression models. JOURNAL OF MATHEMATICS IN INDUSTRY, Bd. 14 (1), S. ARTN 7.
- Brunner, Elisabeth; Kunze, Laura; Laidlaw, Victoria; Jodlbauer, Daniel; Schmidt-Erfurth, Ursula et al. [..] (2024) On improving pyramid wavefront sensor based AO-OCT. Investigative Ophthalmology & Visual Science, Bd. 65 (7), S. 2174-2174.
- Brunner, Elisabeth; Kunze, Laura; Laidlaw, Victoria; Jodlbauer, Daniel; Drexler, Wolfgang et al. [..] (2024) Improvements on speed, stability and field of view in adaptive optics OCT for anterior retinal imaging using a pyramid wavefront sensor. Biomedical Optics Express, Bd. 15 (10), S. 6098-6116.
- Rannetbauer, Wolfgang; Hambrock, Carina; Hubmer, Simon; Ramlau, Ronny (2024) Enhancing Predictive Quality in HVOF Coating Technology: A Comparative Analysis of Machine Learning Techniques. Procedia Computer Science, Bd. 232, S. 1377-1387.
- Hubmer, Simon; Sherina, Ekaterina; Ramlau, Ronny; Pircher, Michael; Leitgeb, Rainer (2023) Subaperture-Based Digital Aberration Correction for Optical Coherence Tomography: A Novel Mathematical Approach. SIAM Journal on Imaging Sciences, Bd. 16 (4), S. 1857-1885.
- Hubmer, Simon; Sherina, Ekaterina; Ramlau, Ronny (2023) Characterizations of adjoint Sobolev embedding operators with applications in inverse problems. Electronic Transaction on Numerical Mathematics, Bd. 59, S. 116-144.
- Hubmer, Simon; Sherina, Ekaterina; Ramlau, Ronny (2023) Characterizations of Adjoint Sobolev Embedding Operators with Applications in Inverse Problems. Electronic Transactions on Numerical Analysis, Bd. 116--144, S. 116--144.
- Hinterer, Fabian; Schneider, Magdalena C.; Hubmer, Simon; Lopez-Martinez, Montserrat; Ramlau, Ronny et al. [..] (2023) Localization of fixed dipoles at high precision by accounting for sample drift during illumination. Applied Physics Letters, Bd. 123 (2), S. 023703.
- Wagner, Roland; Niebsch, Jenny; Ramlau, Ronny (2023) Off-axis point spread function reconstruction for single conjugate adaptive optics. J OPT SOC AM A, Bd. 40 (7), S. 1382-1391.
- Meingast, Stefan; Alves, Joao; Bouy, Herve; Petr-Gotzens, Monika G.; Fuernkranz, Verena et al. [..] (2023) VISIONS: the VISTA Star Formation Atlas I. Survey overview. ASTRON ASTROPHYS, Bd. 673, S. ARTN A58.
- Hinterer, Fabian; Hubmer, Simon; Jethwa, Prashin; Soodhalter, Kirk M.; van de Ven, Glenn et al. [..] (2023) A Projected Nesterov–Kaczmarz Approach to Stellar Population-Kinematic Distribution Reconstruction in Extragalactic Archaeology. SIAM Journal on Imaging Sciences, Bd. 16 (1), S. 192--222.
- Alqahtani, A.; Ramlau, R.; Reichel, L. (2023) Error estimates for Golub-Kahan bidiagonalization with Tikhonov regularization for ill-posed operator equations. INVERSE PROBL, Bd. 39 (2), S. ARTN 025002.
- Jenny Niebsch, Werner v. Bloh, Kirsten Thonicke, Ronny Ramlau (2023) Accelerated photosythesis routine in LPJmL4. Geoscientifec Model Development, Bd. 16 (1), S. 17-33.
- Simioni, Matteo; Arcidiacono, Carmelo; Wagner, Roland; Grazian, Andrea; Gullieuszik, Marco et al. [..] (2022) Point spread function reconstruction for SOUL+LUCI LBT data. Journal of Astronomical Telescopes, Instruments, and Systems (JATIS), Bd. 8 (3), S. 038003.
- Wagner, R.; Saxenhuber, D.; Ramlau, R.; Hubmer, S. (2022) Direction dependent point spread function reconstruction for multi-conjugate adaptive optics on giant segmented mirror telescopes. Astron. Comput., Bd. 40, S. ARTN 100590.
- Hubmer, Simon; Ramlau, Ronny; Weissinger, Lukas (2022) On regularization via frame decompositions with applications in tomography. Inverse Probl., Bd. 38 (5), S. ARTN 055003.
- Stadler, Bernadett,; Ramlau, Ronny (2022) Performance of an iterative wavelet reconstructor for the Multi-conjugate Adaptive Optics Relay of the Extremely Large Telescope. Journal of Astronomical Telescopes, Instruments, and Systems, Bd. 8 (2), S. 021503.
- Hubmer, Simon; Ploier, Alexander; Ramlau, Ronny; Fosodeder, Peter; van Frank, Sandrine (2022) A mathematical approach towards THz tomography for non-destructive imaging. Inverse Problems and Imaging, Bd. 16 (1), S. 68-88.
- Hinterer, Fabian; Schneider, Magdalena C.; Hubmer, Simon; Lopez-Martinez, Montserrat; Zelger, Philipp et al. [..] (2022) Robust and bias-free localization of individual fixed dipole emitters achieving the Cramer Rao bound for applications in cryo-single molecule localization microscopy. PLoS One, Bd. 17 (2), S. ARTN e0263500.
- Grohs, P.; Kritzer, P.; Kunisch, K.; Ramlau, R.; Scherzer, O. (2021) RICAM, the Johann Radon Institute for Computational and Applied Mathematics. European Mathematical Society Magazine, Bd. 122, S. 46-51.
- Gerth, Daniel; Ramlau, Ronny (2021) Estimating Solution Smoothness and Data Noise with Tikhonov Regularization. Numer. Funct. Anal. Optim.
- Brunner, Elisabeth; Shatokhina, Julia; Shirazi, Muhammad Faizan; Drexler, Wolfgang; Leitgeb, Rainer et al. [..] (2021) Retinal adaptive optics imaging with a pyramid wavefront sensor. Biomed. Opt. Express, Bd. 12 (10), S. 5969-5990.
- Ramlau, Ronny; Soodhalter, Kirk M.; Hutterer, Victoria (2021) SUBSPACE RECYCLING-BASED REGULARIZATION METHODS. SIAM J. Matrix Anal. Appl., Bd. 42 (4), S. 1480-1505.
- Fosodeder, Peter; Hubmer, Simon; Ploier, Alexander; Ramlau, Ronny; van Frank, Sandrine et al. [..] (2021) Phase-contrast THz-CT for non-destructive testing. Opt. Express, Bd. 29 (10), S. 15711-15723.
- Hubmer, Simon; Ramlau, Ronny (2021) Frame Decompositions of Bounded Linear Operators in Hilbert Spaces with Applications in Tomography. Inverse Problems, Bd. 37 (5), S. 055001.
- Stadler, Bernadett; Ramlau, Ronny (2021) An augmented wavelet reconstructor for atmospheric tomography. Electronic Transactions on Numerical Analysis (54), S. S. 256 - 275.
- Ramlau, R.; Dykes, L.; Reichel, L.; Soodhalter, K.; Wagner, R. (2021, online: 2020) Lanczos-based fast blind deconvolution methods. Journal of Computational and Applied Mathematics, Bd. Volume 382, S. 113067.
- Hubmer, Simon; Ramlau, Ronny (2020) A frame decomposition of the atmospheric tomography operator. Inverse Probl., Bd. 36 (9), S. ARTN 094001.
- Hinterer, F.; Hubmer, S.; Ramlau, R. (2020) A note on the minimization of a Tikhonov functional with l 1-penalty. Inverse Problems, Bd. 36 (7), S. 074001.
- Ke, Rihuan; Wagner, Roland; Ramlau, Ronny; Chan, Raymond (2020) Reconstruction of the High Resolution Phase in a Closed Loop Adaptive Optics. SIAM J. Imaging Sci., Bd. 13 (2), S. 775-806.
- Shatokhina, J.; Hutterer, V.; Ramlau, R. (2020) Review on methods for wavefront reconstruction from pyramid wavefront sensor data. Journal of Astronomical Telescopes, Instruments and Systems, Bd. 6 (1), S. 010901.
- Hubmer, Simon; Neubauer, Andreas; Ramlau, Ronny; Voss, H. U. (online: 2020) A conjugate-gradient approach to the parameter estimation problem of magnetic resonance advection imaging. Inverse Problems in Science and Engineering.
- Pöttinger, Markus; Ramlau, Ronny; Auzinger, Günter (2019) A new Temporal Control Approach for SCAO Systems. Inverse Problems (36(1)), S. 31.
- Hutterer, Victoria; Ramlau, Ronny; Shatokhina, Iuliia (2019) Real-time adaptive optics with pyramid wavefront sensors:part II. Accurate wavefront reconstruction using iterative methods. Inverse Problems (35 (2019)), S. 045008 (27pp).
- Ramlau, Ronny; Reichel, Lothar (2019) Error estimates for Arnoldi-Tikhonov regularization for ill-posed operator equations. Inverse Probl., Bd. 35 (5), S. ARTN 055002.
- Hutterer, Victoria; Ramlau, Ronny; Shatokhina, Iuliia (2019) Real-time adaptive optics with pyramid wavefront sensors: part I. A theoretical analysis of the pyramid sensor model. Inverse Probl., Bd. 35 (4), S. ARTN 045007.
- Jenny, Niebsch; Ronny, Ramlau (2018) Frequency-dependent reconstruction of imbalances. Electronic Transactions on Numerical Analysis (ETNA), Bd. 48, 2018, S. pp. 435–449.
- Hutterer, Victoria; Shatokhina, Iuliia; Obereder, Andreas; Ramlau, Ronny (2018) Advanced wavefront reconstruction methods for segmented Extremely Large Telescope pupils using pyramid sensors. J. Astron. Telesc. Instrum. Syst., Bd. 4 (4), S. ARTN 049005.
- Hutterer, Victoria; Ramlau, Ronny (2018) Nonlinear wavefront reconstruction methods for pyramid sensors using Landweber and Landweber-Kaczmarz iteration. Applied Optics, Bd. 57 (30), S. 8790-8804.
- Ramlau, Ronny; Scherzer, Otmar (2018) The first 100 years of the Radon transform. Inverse Probl., Bd. 34 (9), S. ARTN 090201.
- Hubmer, Simon; Ramlau, Ronny (2018) Nesterov's accelerated gradient method for nonlinear ill-posed problems with a locally convex residual functional. Inverse Probl., Bd. 34 (9), S. ARTN 095003.
- S. Hubmer, A. Neubauer, R. Ramlau, H. U. Voss (2018) On the Parameter Estimation Problem of Magnetic Resonance Advection Imaging. Journal of Inverse Problems and Imaging, Bd. 12 (1), S. 175-204.
- Buccini, Alessandro; Donatelli, Marco; Ramlau, Ronny (2018) A SEMIBLIND REGULARIZATION ALGORITHM FOR INVERSE PROBLEMS WITH APPLICATION TO IMAGE DEBLURRING. SIAM J. Sci. Comput., Bd. 40 (1), S. A452-A483.
- Wagner, Roland; Ramlau, Ronny; Hofer, Christoph (2018) Point spread function reconstruction for single-conjugate adaptive optics on extremely large telescopes. Journal of Astronomical Telescopes, Instruments, and Systems, Bd. 4 (4), S. 049003.
- Hutterer, Victoria; Shatokhina, Iuliia; Ramlau, Ronny (2018) Real-time Adaptive Optics with pyramid wavefront sensors: A theoretical analysis of the pyramid sensor model. Inverse Problems, Bd. forthcoming.
- Hutterer, Victoria; Ramlau, Ronny; Shatokhina, Iuliia (2018) Real-time Adaptive Optics with pyramid wavefront sensors: Accurate wavefront reconstruction using iterative methods. Inverse Problems, Bd. forthcoming.
- Tapio Helin, Stefan Kindermann, Jonatan Lehtonen, Ronny Ramlau (2018) Atmospheric turbulence profiling with unknown power spectral density. Inverse Problems, Bd. 34 (4), S. 044002.
- V. Hutterer, R. Ramlau (2018) Wavefront reconstruction from nonmodulated pyramid wavefront sensor data using a singular value type expansion. Inverse Problems (34), S. 035002 (19 pp).
- Wagner, Roland; Neubauer, Andreas; Ramlau, Ronny (2017) Simulation results for a finite element-based cumulative reconstructor. Journal of Astronomical Telescopes Instruments and Systems, Bd. 3 (4), S. 049001.
- Hubmer, Simon; Ramlau, Ronny (2017) Convergence analysis of a two-point gradient method for nonlinear ill-posed problems. Inverse Probl., Bd. 33 (9), S. ARTN 095004.
- R. Ramlau, I. Shatokhina (2017) Convolution and Fourier transform based reconstructors for pyramid wavefront sensor. Applied Optics, Bd. 56 (22), S. 6381-6390.
- Daniel Gerth, Andreas Hofinger, Ronny Ramlau (online: 2017) On the lifting of deterministic convergence rates for inverse problems with stochastic noise. Journal on Inverse Problems and Imaging, Bd. 11 (4), S. 663 - 687.
- R. Ramlau, I. Shatokhina (2017) Convolution and Fourier transform based reconstructors for pyramid wavefront sensor. Applied Optics, Bd. 56 (22), S. 6381-6390.
- J. Niebsch, R. Ramlau, K. M. Soodhalter (2017) Solution of coupled differential equations arising from imbalance problems. Electronic Transactions on Numerical Analysis, Bd. 46, S. 89-106.
- D. Gerth, A. Hofinger, R. Ramlau (2017) On the lifting of deterministic convergence rates for inverse problems with stochastic noise. Journal of Inverse Problems and Imaging (11), S. 663-687.
- Neubauer, Andreas; Ramlau, Ronny (2017) A singular value type decomposition for the atmospheric tomography operator. SIAM Journal on Applied Mathematics, Bd. 77, S. 838-853.
- Klann, Esther; Ramlau, Ronny; Sun, Peng (2017) A Mumford-Shah-type approach to simultaneous reconstruction and segmentation for emission tomography problems with Poisson statistics. Journal of Inverse and Ill-Posed Problems, Bd. -, S. 1-22.
- Ramlau, Ronny; Saxenhuber, Daniela (2016) A gradient-based method of atmospheric tomography. Inverse Problems and Imaging, Bd. 10 (3), S. 781-805.
- Wagner, Roland; Helin, Tapio; Obereder, Andreas; Ramlau, Ronny (2016) Efficient Reconstruction Method for Ground Layer Adaptive Optics with mixed Natural and Laser Guide Stars. Applied Optics, Bd. 55 (6), S. 1421-1429 <'http://dx.doi.org/10.1364/AO.55.001421'>.
- Raffetseder, Stefan; Ramlau, Ronny; Yudytskiy, Mykhaylo (2016) Optimal mirror deformation for multi conjugate adaptive optics systems. Inverse Problems, Bd. 32 (2), S. 22.
- (online: 2015) On fractional Tikhonov regularization., Bd. Vol. 23, S. 611--625.
- Gerth, Daniel; Hahn, Bernadette N.; Ramlau, Ronny (2015) The method of the approximate inverse for atmospheric tomography. Inverse Probl., Bd. 31 (6), S. ARTN 065002.
- (online: 2015) An alternating iterative minimisation algorithm for the double-regularised total least square functional., Bd. 31.
- Ramlau, Ronny; Bleyer, Ismael (2015) An alternating iterative minimisation algorithm for the double-regularised total least square functional. Inverse Problems, Bd. 31 (7), S. 075002.
- Klann, Esther; Quinto, Eric Todd; Ramlau, Ronny (2015) Wavelet methods for a weighted sparsity penalty for region of interest tomography. Inverse Probl., Bd. 31 (2), S. ARTN 025001.
- J. Niebsch, R. Ramlau (online: 2014) Simultaneous estimation of mass and aerodynamic rotor imbalances for wind turbines. Journal of Mathematics in Industry, Bd. 4 (1), S. 12.
- Wang, W.; Anzengruber, S. W.; Ramlau, R.; Han, B. (2014) A global minimization algorithm for Tikhonov functionals with sparsity constraints. Applicable Analysis, Bd. 94 (3), S. 580-611.
- Andreas Obereder, Ronny Ramlau, Enrico Fedrigo (2014) Mathematical Algorithms and Software for ELT Adaptive Optics - The Austrian In-kind Contributions for Adaptive Optics. ESO - The Messenger (156), S. 16-20.
- A. Neubauer, R. Ramlau (2014) On convergence rates for quasi-solutions of ill-posed problems. ETNA, Bd. 41, S. 81-92.
- D. Gerth, R. Ramlau (2014) A stochastic convergence analysis for Tikhonov regularization with sparsity constraints. Inverse Problems, Bd. 30 (5), S. 055009.
- M. Yudytskiy, T. Helin, R. Ramlau (2014) Finite element-wavelet hybrid algorithm for atmospheric tomography. Journal of the Optical Society of America A, Bd. 31 (3), S. 550-560.
- R. Ramlau, A. Obereder, M. Rosensteiner, D. Saxenhuber (2014) Efficient iterative tip/tilt reconstruction for atmospheric tomography. Inverse Problems in Science and Engineering, Bd. 22 (8), S. 1345-1366.
- Anzengruber, S. W.; Hofmann, B.; Ramlau, R. (2013) On the interplay of basis smoothness and specific rangeconditions occurring in sparsity regularization. Inverse Problems, Bd. 29 (12), S. 125002.
- M. Eslitzbichler, C. Pechstein, R. Ramlau (2013) An H^1 Kaczmarz reconstructor for atmospheric tomography. Journal of Inverse and Ill-Posed Problems, Bd. 21 (3), S. 431-450.
- M. Rosensteiner, R. Ramlau (2013) The Kaczmarz algorithm for multiconjugated adaptive optics with laser guide starsJournal of the Optical Society of America. Journal of the Optical Society of America A, Bd. 30(8), S. 1680-1686.
- I. Shatokhina, A. Obereder, M. Rosensteiner, R. Ramlau (2013) Preprocessed cumulative reconstructor with domain decomposition: a fast wavefront reconstruction method for pyramid wavefront sensor. Applied Optics, Bd. 52(12), S. 2640-2652.
- E. Klann, R. Ramlau (2013) Regularization properties of Mumford-Shah type functionals with perimeter and norm constraints for linear ill-posed problems. SIAM Journal of Imaging Sciences, Bd. 6, S. 413-436.
- I. Bleyer, R. Ramlau (2013) A Double Regularization Approach for Inverse Problems with Noisy Data and Inexact Operator. Inverse Problems, Bd. 29, S. 025004.
- Ramlau, R.; Rosensteiner, M. (2012) A Kaczmarz type reconstructor for MCAO data. Inverse Problems, Bd. 28 (9), S. 8277-8287.
- Ramlau, R.; Zarzer, C. (2012) On the optimization of a Tikhonov functional with non-convex sparsity constraints. ETNA, Bd. 39, S. 476-507.
- Anzengruber, S. W.; Klann, E.; Ramlau, R.; Tonova, D. (2012) Numerical methods for the design of gradient-index optical coatings. Applied Optics, Bd. 51 (34), S. 173652.
- Lettmann, K.; Riedinger, N.; Ramlau, R.; Knab, N.; Böttcher, M. et al. [..] (2012) Estimation of biogeochemical rates from concentration profiles: a novel inverse method. Estuarine, Coastal and Shelf Science, Bd. 100, S. 26-37.
- Kindermann, S.; Neubauer, A.; Ramlau, R. (2012) A singular value decomposition for the Shack-Hartmann based wavefront reconstruction. J. Comput. Appl. Math., Bd. 236 (8), S. 2186-2199.
- M. Zhariy, A. Neubauer, M. Rosensteiner, R. Ramlau (2011) Cumulative Wavefront Reconstructor for the Shack-Hartmann Sensor. Inverse Problems and Imaging, Bd. 5 (4), S. 893 - 913.
- Ramlau, S. Anzengruber and R. (2011) Convergence rates for Morozov's discrepancy principle using variational inequalities. Inverse Problems, Bd. 27 (10), S. 105007.
- E. Klann, R. Ramlau, L. Reichel (2011) Wavelet-Based Multilevel Methods for Linear Ill-Posed Problems. BIT, Bd. 51 (3), S. 669-694.
- E. Klann, R. Ramlau, W. Ring (2011) A Mumford-Shah level-set approach for the inversion and segmentation of SPECT / CT data. Inverse Problems in Imaging, Bd. 5 (1).
- C. Brandt, J. Niebsch, R. Ramlau, P. Maass (2011) Modeling the influence of unbalances for ultra-precision cutting processes. Zeitschrift für Angewandte Mathematik und Mechanik (ZAMM), Bd. 2011, S. 14.
- R. Ramlau, W. Ring (2010) Regularization of linear operator equations by Perimeter constraints. Inverse Problems.
- R. Ramlau, C. Zarzer (2010) On the optimization of a Tikhonov functional with non-convex sparsity constraints.
- Jenny Niebsch, Ronny Ramlau, Thien T. Nguyen (2010) Mass and Aerodynamic Imbalance Estimates of Wind Turbines. Energies (3), S. 696-710.
- Anzengruber, Stephan W.; Ramlau, Ronny (2010) Morozov's discrepancy principle for Tikhonov-type functionals with non-linear operators. Inverse Problems, Bd. 26 (2), S. 17pp.
- Ronny Ramlau, Elena Resmerita (2010) Convergence rates for regularization with sparsity constraints. ETNA.
- M. Fornasier, R. Ramlau and G. Teschke (2009) The application of joint sparsity and total variation minimization algorithms to a real-life art restoration problem. Adv. Comput. Math., Bd. 31 (1-3), S. 157-184.
- Ronny Ramlau, Jenny Niebsch (2009) Imbalance Estimation Without Test Masses for Wind Turbines. Journal of Solar Energy Engineering.
- R.Ramlau, L.Justen and (2009) A general framework for Soft-Shrinkage with Applications to blind deconvolution and wavelet denoising. Appl. Comp. Harmon. Anal, Bd. 26 (1), S. 43-63.
- R. Ramlau, G. Teschke, and M. Zhariy (2008) A Compressive Landweber Iteration for Solving Ill-Posed Inverse Problems. Inverse Problems.
- Ramlau, R. (2008) Regularization properties of Tikhonov regularization with sparsity constraints. Electronic Transactions on Numerical Analysis (30), S. 54-74.
- S. Anzengruber, F. Bauer, A. Leitão, R. Ramlau (2008) New algorithms for parallel MRI. Journal of Physics: Conference Series, Bd. 135, S. 8p.
- Klann, Esther; Ramlau, Ronny (2008) Regularization by fractional filter methods and data smoothing. Inverse Problems, Bd. 24 (4), S. 501-526.
- S. Lu, S. Pereverzyev, R. Ramlau (2007) An analysis of Tikhonov regularization for nonlinear ill-posed problems under general smoothness assumptions. Inverse Problems (23), S. 217-230.
- S. Kindermann, R. Ramlau (2007) Surrogate Functional and Tresholding for Inverse Interface problems. J. of Inv. and Ill-Posed Problems, Bd. 15 (4), S. 387-402.
- R. Ramlau, G. Teschke (2007) An Iterative Algorithm for Nonlinear Inverse Problems with Joint Sparsity Constraints in Vector Valued Regimes and an Application to Color Image Inpainting. Inverse Problems, Bd. 23 (5), S. 1851-1870.
- R. Ramlau, V. Dicken, P. Maass, A. Rienäcker, C. Streller (2006) Inverse Imbalance Reconstruction in Rotordynamics. ZAMM, Bd. 86(5), S. 385-399.
- R. Ramlau, G. Teschke (2006) A Tikhonov-based projection iteration for nonlinear Ill - posed problems with sparsity constraints. Numerische Mathematik, Bd. 104, S. 177-203.
- R. Ramlau, R. Ring (2006) A Mumford-Shah approach for contour tomography. J. Comp. Physics, Bd. 221, S. 539-557.
- E. Klann, P. Maass, R. Ramlau (2006) Two-step regularization methods for linear inverse problems. Journal of Inverse and Ill Posed Problems, Bd. 14(6), S. 583-607.
- L. Justen, R. Ramlau (2006) A non-iterative regularization approach to blind deconvolution. Inverse Problems, Bd. 22, S. 771-800.
- R. Ramlau, J. Niebsch (2006) Automatische Unwuchterkennung am Rotor. Erneuerbare Energien, Bd. 5.
- Ramlau, R. (2005) On the use of fixed point iterations for the regularization of nonlinear ill-posed problems. Journal for Inverse and Ill-Posed Problems, Bd. 13(2), S. 175-200.
- R. Ramlau, G. Teschke (2005) Tikhonov Replacement Functionals for Iteratively Solving Nonlinear Operator Equations. Inverse Problems, Bd. 21(5), S. 1571-1592.
- Dicken, V.; Menz, I.; Maass, P.; Niebsch, J.; Ramlau, R. (2005) Inverse imbalance reconstruction for nonlinearly damped systems. Inverse Problems in Science and Engineering, Bd. 13(5), S. 507-543.
- Ramlau, R.; Dicken, V.; Maass, P.; Rienäcker, A.; Streller, C. (2005) Inverse Imbalance Reconstruction in Rotordynamics. ZAMM.
- Justen, L.; Ramlau, R. (2005) A non-iterative regularization approach to blind deconvolution. Inverse Problems.
- L. Justen, R. Ramlau A General Framework for Soft – Shrinkage with Applications to Blind Deconvolution and Wavelet Denoising. Applied and Computational Harmonic Analysis.
- Modeling the Influence of Unbalances for Ultra-Precision Cutting Processes. Zeitschrift für Angewandte Mathematik und Mechanik (ZAMM).
- Alessandro Buccini, Marco Donatelli, Ronny Ramlau A semi-blind regularization algorithm for inverse problems with application to image deblurring. SIAM Journal on Scientific Computing, Bd. forthcoming, S. x-x.
- Stadler, Bernadett; Ramlau, Ronny An augmented wavelet reconstructor for atmospheric tomography. Electonic Transactions on Numerical Analysis (Vol 54), S. 234- 253.
Book/Monograph (2)
Conference Contribution: Publication in Proceedings (22)
- Davies, Richard; Alves, Joao; Vulcani, Benedetta; Simioni, Matteo; Wagner, Roland et al. [..] (2024) The MICADO first light imager for the ELT: overview and current status. In: Bryant, Julia J.; Motohara, Kentaro; Vernet, Joël R. D. (Hrsg.), Ground-based and Airborne Instrumentation for Astronomy X (SPIE ASTRONOMICAL TELESCOPES + INSTRUMENTATION | 16-22 JUNE 2024): SPIE, S. 1309611.
- Hambrock, Carina; Rannetbauer, Wolfgang; Hubmer, Simon; Ramlau, Ronny (2024) Gas-Fuel HVOF and Its Influencing Factors: Introducing the Total Gas Flow., Proceedings from the International Thermal Spray Conference. Milan, Italy, S. 284-290.
- Rannetbauer, Wolfgang; Hambrock, Carina; Hubmer, Simon; Ramlau, Ronny (2024) Databased Optimization of Coating Characteristics—Challenges and Possible Solution., Proceedings of the ITSC 2024. Thermal Spray 2024: Proceedings from the International Thermal Spray Conference. Milan, Italy: SIAM, S. 459-468.
- Grazian, Andrea; Simioni, Matteo; Arcidiacono, Carmelo; Achren, Jani; Clenet, Yann et al. [..] (2022) Status of the PSF reconstruction work package for MICADO at ELT.
- Simioni, Matteo; Arcidiacono, Carmelo; Wagner, Roland; Grazian, Andrea; Gullieuszik, Marco et al. [..] (2022) LBT SOUL data as a science test bench for MICADO PSF-R tool. In: SPIE (Hrsg.), Proc. SPIE 12185, Adaptive Optics Systems VIII, 121850D (SPIE Astronomical Telescopes + Instrumentation, 2022, Montréal, Québec, Canada): SPIE.
- Stadler, Bernadett,; Biasi, Roberto,; Manetti, Mauro,; Ramlau, Ronny, (2022) Parallel Implementation of an iterative solver for atmospheric tomography. In: Engineers, IEEE - Institute of Electrical and Electronics (Hrsg.) (21. International Conference on Computational Science and its Applications (ICCSA)); Cagliari, Italy, S. 123 - 132.
- Simioni, M.; Arcidiacono, C.; Grazian, A.; Clenet, Y.; Davies, R. et al. [..] (2020) MICADO PSF-reconstruction work package description. In: SPIE (Hrsg.) In Reihe: Adaptive Optics Systems VII: SPIE <'https://www.spie.org/Publications/Proceedings/Paper/10.1117/12.2561251?SSO=1'>.
- Ramlau, Ronny; Zeilinger, Werner W.; Wagner, Roland; al., et (2020) MICADO PSF-reconstruction work package description. In: SPIE (Hrsg.) (Adaptive Optics Systems VII) In Reihe: Proc. SPIE 11448: SPIE.
- Ramlau, Ronny; Stadler, Bernadett; Biasi, Roberto; Manetti, Mauro (2019) Feasibility of standard and novel solvers in atmospheric tomography for the ELT. In: AO4ELT (Hrsg.) (Adaptive Optics for Extremely Large Telescopes 6); Quebec, S. 9.
- Hutterer, Victoria; Obereder, Andreas; Raffetseder, Stefan; etal. (2019) Model-based wavefront reconstruction tested on the LOOPS bench. In: AO4ELT6 (Hrsg.) (Adaptive Optics for Extremely Large Telescopes 6); Quebec.
- Hutterer, Victoria; Ramlau, Ronny; Shatokhina, Iuliia; Obereder, Andreas (2018) Wavefront reconstruction for ELT-sized telescopes with pyramid wavefront sensors. (spie astronomical telescopes and instrumentation); Austin, S. 10703 - 1070344 - 18.
- Davies, Ric; Alves, João; Wagner, Roland; Niebsch, Jenny; Ramlau, Ronny et al. [..] (2018) The MICADO first light imager for the ELT: overview, operation, Simulation., Proceeding of the SPIE Astronomical Telescopes and Instrumentation Conference Austin 2018 (spie. Astronomical Telescopes and Instrumentation) In Reihe: 10702: Ground-based and Airborne Instrumentation for Astronomy VII, S. 107021S.
- Davies, R.; Schubert, J.; Hartl, M.; Alves, J.; Clenet, Y. et al. [..] (2016) MICADO: first light imager for the E-ELT., Proceedings SPIE 9908, Ground-based and Airborne Instrumentation for Astronomy VI (Ground-based and Airborne Instrumentation for Astronomy VI conference); Edinburgh, S. 99081Z.
- R. Ramlau, D. Saxenhuber, M. Yudytskiy (2014) Iterative reconstruction methods in atmospheric tomography: FEWHA, Kaczmarz and Gradient-based algorithm., SPIE, Bd. 31.
- Jenny Niebsch, Ronny Ramlau, Christina Brandt (2011) Unbalances in ultra-precision cutting machinery and the relation to surface quality. (9. Internationale tagung Schwingungen in rotierenden Maschinen); Darmstadt.
- Brandt C., Niebsch J., Maaß P., Ramlau R. (2010) Simulation of Process Machine Interaction for Ultra Precision Turning. (Proceedings of the 2nd International Conference on Process Machine Interactions); Vancouver.
- Brandt, C.; Karimi, H.R.; Piotrowska, I.; Niebsch, J.; Ramlau, R.; Krause, A.; Riemer, O.; Maaß, P. (2008) Process Machine Interaction Model for Turning Processes., Proceedings of the 1st International Conference on Process Machine Interactions; Hannover.
- Jenny Niebsch, Ronny Ramlau (2008) Mathematical Imbalance Determination from Vibrational Measurements and Industrial Applications. (2008 ASME DETC & Computers and Information in Engineering Conference (CIE) 2008).
- Ronny Ramlau, ; Esther Klann, ; Ring, Wolfgang (2007) Simultaneous Reconstruction and Segmentation for Tomography Data. (Special Issue: Sixth International Congress on Industrial Applied Mathematics (ICIAM07) and GAMM Annual Meeting, Zürich 2007) In Reihe: PAMM; Weinheim: WILEY-VCH Verlag GmbH & Co. KGaA, S. 1050301-1050302.
- Ramlau, R. (2006) Tikhonov regularization with non - standard constraints for Tomography. In: A. K. Louis, F. Natterer, E. T. Quinto (Hrsg.), Mathematical Methods in Tomography In Reihe: Oberwolfach Report, Bd. 34/2006, S. 62-64.
- Hutterer, Victoria; Ramlau, Ronny; Shatokhina, Iuliia; etal The Quad sensor: a new Fourier-based wave front sensor derived from the 4 quadrants coronagraph., Proceedings of AO4ELT6, (AO4ELT6); Quebec.
- Jenny Niebsch, Ronny Ramlau Imbalances in high precision cutting machinery. (ASME 2009 International Design Engineering Technical Conferences IDETC); San Diego.
Conference Contribution: Poster (in Proceedings) (4)
- Wagner, Roland; Hubmer, Simon; Niebsch, Jenny; Ramlau, Ronny; Stadler, Bernadett (2022) Off-axis PSF reconstruction for SCAO and MCAO systems (Poster). SPIE Astronomical Telescopes + Instrumentation, 2022, Montréal, Québec, Canada.
- Hutterer, Victoria; Ramlau, Ronny; Shatokhina, Iuliia (2017) Two novel algorithms for wavefront reconstruction from pyramid sensor data: Convolution with Linearized Inverse Filter and Pyramid Fourier Transform Reconstructor (Poster). AO4ELT.
- Hutterer, Victoria; Ramlau, Ronny; Shatokhina, Iuliia (2017) Wavefront Reconstruction from Pyramid Sensor Measurements based on the Inversion of the Finite Hilbert Transform (Poster). AO4ELT.
- Cantalloube, Faustine; Obereder, Andreas; Ramlau, Ronny; Raffetseder, Stefan; Shatokhina, Iuliia et al. [..] (2017) Status of the SCAO design of METIS and end-to-end simulation performances (Poster). AO4ELT Teneriffa 2017.
Contribution in Collection (8)
- Weissinger, Lukas; Stadler, Bernadett; Hubmer, Simon; Ramlau, Ronny (2024) Singular value and frame decomposition-based reconstruction for atmospheric tomography. In: Mejri, Bochra; Ramlau, Ronny; Scherzer, Otmar (Hrsg.), Inverse Problems on Large Scales: Mathematical Modelling and Computational Methods; Berlin/Boston: De Gruyter, S. 151-180.
- Ronny, Ramlau; Jenny, Niebsch (2021) Tomographic Reconstruction for Single Conjugate Adaptive Optics. In: Barbara, Kaltenbacher; Thomas, Schuster; Anne, Wald (Hrsg.), Time-dependent Problems in Imaging and Parameter Identification: Springer, S. 303-322.
- Ramlau, Ronny; Koutschan, Christoph; Hofmann, Bernd (2020) On the singular value decomposition of n-fold integration operators. In: Cheng, Jin; Lu, Shuai; Yamamoto, Masahiro (Hrsg.), Inverse Problems and Related Topics; Singapore: Springer, S. 237-256.
- Engl, Heinz W.; Ramlau, Ronny (2015) Regularization of Inverse Problems. In: Engquist, Björn (Hrsg.), Encyclopedia of Applied and Computational Mathematics: Springer, S. 1233-1241.
- C. Brandt, A. Krause, J. Niebsch, J. Vehmeyer, E. Brinksmeier, P. Maaß, R. Ramlau (2013) Surface Generation Process with Consideration of the Balancing State in Diamond Machining. In: Berend Denkena, Ferdinand Hollmann (Hrsg.), Lecture Notes in Production Engineering, Process Machine Interactions: Springer, S. 329-360.
- Brandt, C.; Krause, A.; Niebsch, J.; Vehmeyer, J.; Brinksmeier, E. et al. [..] (2012) Surface Generation Process with Consideration of the Balancing State in Diamond Machining., Process Machine Interactions Predicition and Manipulation of Interactions between Manufacturing Processes and Machine Tool Structures: Springer, S. 329-360.
- R. Ramlau, G. Teschke (2010) Sparse recovery in Inverse Problems. In: Fornasier, M. (Hrsg.), Theoretical foundations and numerical methods for sparse recovery: De Gryter, S. 201-262.
- Niebsch, Jenny; Ramlau, Ronny Imbalance Determination for Wind Turbines.
Editorship (1)
Dissertation (1)
Research Report (24)
- Ramlau, Ronny; Koutschan, Christoph; Hofmann, Bernd (2018) On the singular value decomposition of n-fold integration operators. Bericht-Nr. 2018-29; RICAM: Linz.
- Wagner, R.; Ramlau, R.; Davies, R.; Alves, J.; Kleijn, G. Verdoes (2018) Mathematical Algorithms for MICADO - First Light Instrument at the European Extremely Large Telescope, in: Mathematics with industry: driving innovation, ECMI Annual Report 2017 (ECMI - European Consortium for Mathematics in Industry).
- M. Yudytskiy, T. Helin and R. Ramlau (2013) A finite element-wavelet hybrid algorithm for atmospheric tomography. Bericht-Nr. 2013-14; RICAM: Linz.
- M. Yudytskiy, T. Helin and R. Ramlau (2013) A frequency dependent preconditioned wavelet method for atmospheric tomography. Bericht-Nr. 2013-13; RICAM: Linz.
- G. Auzinger, A. Obereder, R. Ramlau, M. Rosensteiner, D. Saxenhuber and M. Yudytskiy (2013) AO3: Final Report. Bericht-Nr. 48; ESO:.
- Klann, Esther; Ramlau, Ronny; Ring, Wolfgang (2009) A Mumford-Shah level-set approach for the inversion and segmentation of SPECT/CT data. Bericht-Nr. 2009-06; Johann Radon Institute for Computational and Applied Mathematics: Linz.
- Klann, Esther; Ramlau, Ronny (2007) Regularization by fractional filter methods and data smoothing. Bericht-Nr. 2007-24; Johann Radon Institute for Computational and Applied Mathematics: Linz.
- Auzinger, Günther MPIM -- a flexible method for extension of obstructed measurements from a Shack-Hartmann Sensor to a full square area. Bericht-Nr. 12;.
- al., R Ramlau et Final Report AO1: Introductory study Austrian In-Kind Contribution Mathematical Algorithms and Software for ELT Adaptive Optics. Bericht-Nr. 2;.
- Zhariy, G. Auzinger and A. Obereder and R. Ramlau and M. Rosensteiner and I. Shatokhina and M. Yudytskiy and M. Mid Term Review AO4: SCAO / XAO. Bericht-Nr. 16; ESO:.
- Yudytskiy, T. Helin and A. Obereder and R. Ramlau and M. Rosensteiner and M. Mid Term Review AO2: MCAO. Bericht-Nr. 17; ESO:.
- Rosensteiner, R. Ramlau and M. A Kaczmarz type reconstructor for MCAO data. Bericht-Nr. 19;.
- R. Ramlau, G. Auzinger, A. Obereder, M. Rosensteiner, and M. Yudytskiy Mid Term Review AO3: MOAO. Bericht-Nr. 22; ESO:.
- R. Ramlau, G. Auzinger, A. Obereder, M. Rosensteiner, Iu. Shatokhina, and M. Yudytskiy AO4: Final Report. Bericht-Nr. 28; ESO:.
- R. Ramlau, G. Auzinger, A. Obereder, M. Rosensteiner, D. Saxenhuber, and M. Yudytskiy AO2: Final Report. Bericht-Nr. 40; ESO:.
- Shatokhina, Iuliia Simulation of the non-modulated pyramid wavefront sensor. Bericht-Nr. 7;.
- Auzinger, Günther Technical report on the SVD method for a wavefront reconstruction based on Shack-Hartmann sensor measurements. Bericht-Nr. 4;.
- Obereder, Andreas Applying the CuRe on modulated Pyramid-WFS measurements. Bericht-Nr. 10;.
- Obereder, Andreas Eighteen months technical report of the austrian in-kind project AO. Bericht-Nr. 8;.
- Obereder, Andreas Simulation of the non-modulated pyramid wavefront sensor. Bericht-Nr. 1;.
- Rosensteiner, Matthias Wavefront reconstruction for Extremely Large Telescopes via CuRe with Domain Decomposition. Bericht-Nr. 18;.
- Rosensteiner, Matthias The cumulative reconstructor - basics and first results. Bericht-Nr. 3;.
- Rosensteiner, Matthias Solving the GLAO problem with the CuReD. Bericht-Nr. 9;.
- Shatokhina, Iuliia Simulation of the modulated pyramid and roof wavefront sensors. Bericht-Nr. 11;.
Other Publication (4)
- Gfrerer, Helmut; Hubmer, Simon; Ramlau, Ronny (2024) On SCD Semismooth∗ Newton methods for the efficient minimization of Tikhonov functionals with non-smooth and non-convex penalties. arxiv:2410.13730v1.
- Hubmer, Simon; Laidlaw, Victoria; Ramlau, Ronny; Sherina, Ekaterina; Stadler, Bernadett (2024) On Phase Unwrapping via Digital Wavefront Sensors. arXiv preprint arXiv:2405.15419.
- Weissinger, Lukas; Hubmer, Simon; Stadler, Bernadett; Ramlau, Ronny (2024) Singular Value and Frame Decomposition-based Reconstruction for Atmospheric Tomography. arXiv preprint arXiv:2405.01079.
- Obereder, Andreas; Ramlau, Ronny; Shatokhina, Iuliia Fast wavefront reconstruction algorithms for adaptive optics in astronomy. Conference Paper: Symposium on Mathematical Optics, Image Modelling and Algorithms, 20.-23. 6. 2016 Hanover, Germany.