Prof. Constantin Popa

2014

• Popa C., Preclik T., Rüde U.:
  Regularized solution of LCP problems with application to rigid body dynamics
  In: Numerical Algorithms (2014), p. 1-12
  ISSN: 1017-1398
  DOI: 10.1007/s11075-014-9886-0
  URL: http://link.springer.com/article/10.1007/s11075-014-9886-0

2012

• Popa C., Preclik T., Köstler H., Rüde U.:
  On Kaczmarz's projection iteration as a direct solver for linear least squares problems
  In: Linear Algebra and Its Applications 436 (2012), p. 389-404
  ISSN: 0024-3795
  DOI: 10.1016/j.laa.2011.02.017
• Popa C., Preclik T., Rüde U.:
  Iterative Regularized Solution of Linear Complementarity Problems
  SIAM Conference on Applied Linear Algebra, Valencia, Spain June 2012 (Valencia, Spanien)
  In: Proceedings of the SIAM Conference on Applied Linear Algebra, Valencia, Spain June 2012
  URL: http://www.researchgate.net/profile/Ulrich_Ruede/publication/270048258_iterative-regularized/links/549e8cea0cf2d6581ab67e88.pdf

2011

• Nicola A., Popa C., Rüde U.:
  On a regularization technique for Kovarik-like approximate orthogonalization algorithms
  In: Carpathian Journal of Mathematics 27 (2011), p. 114-122
  ISSN: 1584-2851
  URL: http://carpathian.ubm.ro/accepted_papers/down.php?f=siteCarpathian_2011_27_131_141.pdf
• Nicola A., Popa C., Rüde U.:
  Projection Algorithms with Correction
  In: Journal of Applied Mathematics & Informatics 29 (2011), p. 697-712
  ISSN: 1598-5857
  URL: http://www.kcam.biz/contents/table_contents_view.php?Len=&idx=1186#
• Popa C., Preclik T., Rüde U.:
  Iterative Regularized Solution of Symmetric and Positive Semi-Definite Linear Complementarity Problems
  (2011), p. 12
  URL: https://www10.cs.fau.de/publications/reports/TechRep_2011-05.pdf
  (Techreport)
• Preclik T., Popa C., Rüde U.:
  Regularizing a Time-stepping Method for Rigid Multibody Dynamics
  Multibody Dynamics 2011 (Brüssel)
  In: Multibody Dynamics 2011 2011
  URL: https://www10.informatik.uni-erlangen.de/Publications/Papers/2011/Preclik_Multibody_Ext_Abstr.pdf

2010

• Popa C., Preclik T.:
  Iterative Solution of Weighted Least Squares Problems with Applications to Rigid Multibody Dynamics
  (2010)
  URL: https://www10.cs.fau.de/publications/reports/TechRep_2010-10.pdf
  (Techreport)
• Popa C., Preclik T., Köstler H., Rüde U.:
  Some projection-based direct solvers for general linear systems of equations
  (2010), p. 32
  URL: https://www10.cs.fau.de/publications/reports/TechRep_2010-06.pdf
  (Techreport)
• Popa Constantin, Nicola Aurelian, Rüde Ulrich:
  Coarse grid correction by aggregation/disaggregation with application in image reconstruction
  In: Proceedings in Applied Mathematics and Mechanics 10 (2010), p. 755-756
  ISSN: 1617-7061
  URL: http://www.researchgate.net/profile/Ulrich_Ruede/publication/264478433_Coarse_grid_correction_by_aggregation__disaggregation_with_application_in_image_reconstruction/links/543177cf0cf29bbc12789938.pdf
• Preclik T., Rüde U., Popa C.:
  Resolving Ill-posedness of Rigid Multibody Dynamics
  (2010), p. 19
  URL: https://www10.cs.fau.de/publications/reports/TechRep_2010-11.pdf
  (Techreport)

2009

• Nicola A., Popa C., Rüde U.:
  Projection algorithms with correction
  (2009), p. 19
  URL: https://www10.cs.fau.de/publications/reports/TechRep_2009-15.pdf
  (Techreport)
• Nicola A, Popa Constantin, Rüde Ulrich:
  On a regularization technique for Kovarik-like approximate orthogonalization algorithms
  (2009), p. 10
  URL: https://www10.cs.fau.de/publications/reports/TechRep_2009-14.pdf
  (Techreport)

2008

• Köstler H., Popa C., Prümmer M., Rüde U.:
  Algebraic Full Multigrid in Image Reconstruction
  5th Workshop on Mathematical Modellingof Environmental and Life Sciences Problems (Constanta, Romania, 10. September 2006 - 13. September 2006)
  In: Stelian I, Marinoschi G, Popa C (ed.): Series on Mathematical Modelling of Environmental and Life Sciences, Proceedings of the fifth workshop, September, 2006, Constanta, Romania, Bukarest: 2008
  Open Access: https://www10.cs.fau.de/publications/papers/2008/KoestlPopaPruemmRuede08.pdf
  URL: https://www10.cs.fau.de/publications/papers/2008/KoestlPopaPruemmRuede08.pdf

2007

• Popa C.:
  A hybrid Kaczmarz - Conjugate Gradient algorithm
  (2007), p. 10
  URL: https://www10.cs.fau.de/publications/reports/TechRep_2007-02.pdf
  (Techreport)
• Popa C., Rüde U.:
  Algebraic multigrid for general inconsistent linear systems: theoretical and experimental aspects
  (2007), p. 17
  URL: https://www10.cs.fau.de/publications/reports/TechRep_2007-14.pdf
  (Techreport)

2006

• Köstler H., Popa C., Prümmer M., Rüde U.:
  Towards an Algebraic Multigrid Method for Tomographic Image Reconstruction - Improving Convergence of ART
  European Conference on Computational Fluid Dynamics (Egmond aan Zee, NL)
  In: ECCOMAS CFD 06 2006
  URL: https://www10.informatik.uni-erlangen.de/Publications/Papers/2006/Koestler_ECCOMAS-CFD_06
• Köstler H., Popa C., Rüde U.:
  Algebraic multigrid for general inconsistent linear systems: The correction step
  (2006), p. 10
  URL: https://www10.cs.fau.de/publications/reports/TechRep_2006-04.pdf
  (Techreport)
• Mohr M., Popa C., Rüde U.:
  Analysis of a Preconditioned CG Method for an Inverse Bioelectric Field Problem
  4th Workshop on Mathematical Modelling of Environmental and Life Sciences Problems (Constanta, Romania)
  In: Mathematical Modelling of Environmental and Life Sciences Problems (Proc. of 4th workshop, Sept 2005, Constanta, Romania), Bukarest: 2006
  URL: https://www10.informatik.uni-erlangen.de/Publications/Papers/2007/Mohr_Proc_4th_MMEnvLifSci07.pdf
• Popa Constantin, Udrescu Tudor:
  A fast approximation for discrete Laplacian
  4th Workshop on Mathematical Modelling of Environmental and Life Sciences Problems (Constanta, Romania)
  In: Mathematical Modelling of Environmental and Life Sciences Problems (Proc. of 4th workshop, Sept 2005, Constanta, Romania), Bukarest: 2006
• Popa C.:
  Algebraic multigrid for general inconsistent linear systems: Preliminary results
  (2006), p. 16
  URL: https://www10.cs.fau.de/publications/reports/TechRep_2006-02.pdf
  (Techreport)
• Bautu Andrei, Bautu Elena, Popa Constantin:
  Evolutionary Algorithms in Image Reconstruction from Limited Data
  4th Workshop on Mathematical Modelling of Environmental and Life Sciences Problems (Constanta, Romania)
  In: Mathematical Modelling of Environmental and Life Sciences Problems (Proc. of 4th workshop, Sept 2005, Constanta, Romania), Bukarest: 2006
• Popa Constantin, Zdunek Rafael:
  Gibbs regularized tomogrpaphic image reconstruction with DW algorithm based on generalized oblique projections
  4th Workshop on Mathematical Modelling of Environmental and Life Sciences Problems (Constanta, Romania)
  In: Mathematical Modelling of Environmental and Life Sciences Problems (Proc. of 4th workshop, Sept 2005, Constanta, Romania), Bukarest: 2006
• Popa C.:
  Kovarik-like algorithms for Tikohonov regularization of dense inverse problems
  (2006), p. 9
  URL: https://www10.cs.fau.de/publications/reports/2006/TechRep_2006-01.pdf
  (Techreport)

2005

• Popa Constantin, Zdunek Rafal:
  Regularized ART with Gibbs Priors for Tomographic Image Reconstruction
  18th Symposium Simulationstechnique ASIM 2005 (Erlangen)
  In: 18th Symposium Simulationstechnique ASIM 2005 Proceedings, Erlangen: 2005
  URL: https://www10.informatik.uni-erlangen.de/Publications/Papers/2005/Popa_Zdunek_ASIM05.pdf
• Bautu Andrei, Bautu Elena, Popa Constantin:
  Tikhonov Regularization in Image Reconstruction with Kaczmarz Extended Algorithm
  18th Symposium Simulationstechnique ASIM 2005 (Erlangen)
  In: 18th Symposium Simulationstechnique ASIM 2005 Proceedings, Erlangen: 2005
  URL: https://www10.informatik.uni-erlangen.de/Publications/Papers/2005/Bautu_Popa_ASIM05.pdf
• Popa C., Zdunek R.:
  Regularized ART with Gibbs Priors for Tomographic Image Reconstruction
  (2005), p. 8
  URL: https://www10.cs.fau.de/publications/reports/TechRep_2005-05.pdf
  (Techreport)

2004

• Mohr M., Popa C., Rüde U.:
  An Iterative Algorithm for Approximate Orthogonalisation of Symmetric Matrices
  In: International Journal of Computer Mathematics 81 (2004), p. 215-226
  ISSN: 0020-7160
  DOI: 10.1080/00207160310001650134

2003

• Mohr M., Popa C., Rüde U.:
  An Iterative Algorithm for Approximate Orthogonalisation of Symmetric Matrices
  (2003), p. 10
  URL: https://www10.cs.fau.de/publications/reports/TechRep_2003-02.pdf
  (Techreport)
• Mohr M., Popa C., Rüde U.:
  Numerical Solution of Least-Squares Problems by a Modified Kovarik Algorithm
  (2003), p. 8
  URL: https://www10.cs.fau.de/publications/reports/TechRep_2003-07.pdf
  (Techreport)
• Pelican E., Popa C.:
  Some Remarks on a Collocation Method for First Kind Integral Equations
  (2003), p. 7
  URL: https://www10.cs.fau.de/publications/reports/TechRep_2003-01.pdf
  (Techreport)
• Popa C., Zdunek R.:
  Kaczmarz Extended Algorithm for Tomographical Image Reconstruction from Limited-Data
  (2003), p. 32
  URL: https://www10.cs.fau.de/publications/reports/TechRep_2003-06.pdf
  (Techreport)

1999

• Mohr M., Popa C., Rüde U.:
  An experimental analysis of a differential inverse problem
  (1999)
  URL: https://www10.cs.fau.de/publications/reports/TechRep_1999-01.pdf
  (Techreport)