Dr. Christos Kravvaritis

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Address:
TU München
Institut für Informatik
Boltzmannstr. 3
85748 Garching b. München
Office:
MI 02.05.036
Email:
christos.kravvaritis@in.tum.de
Phone:
(089) 289 18 618
Fax:
(089) 289 18 607
Personal Homepage:
http://ckravv.googlepages.com
Office Hours
By arrangement

Forschungsgebiete (Research Area)

  • Numerische Lineare Algebra
  • Multigridverfahren
  • Strukturierte Matrizen (Hadamard, weighing, compound)
  • Determinanten
  • Numerische Methoden für ODEs und PDEs
  • Codierungstheorie

Personal data

CV

07.11.1980 Born in Athens
May 1998 Abitur (Deutsche Schule Athen)
Sep. 1998 - Jun. 2002 Studies of Mathematics (major in Applied Mathematics) at the National & Kapodistrian University of Athens
Jun. 2002 Dipl.-Math.
Sep. 2002 - Oct. 2004 Master of Science in Applied Mathmatics, National & Kapodistrian University of Athens
May 2005 - Jul. 2008 Wissenschaftlicher Mitarbeiter, National & Kapodistrian University of Athens
Jul. 2008 Dr. rer. nat.
Jan. 2009 - Jun. 2010 Forschunsstipendiat der Alexander von Humoldt-Stiftung, Department of Computer Science, Technical University of Munich



List of Publications

Refereed Publications

C. Kravvaritis and M. Mitrouli, The growth factor of a Hadamard matrix of order 16 is 16, Numer. Linear Algebra Appl., 16 (2009), 715-743.
C. Kravvaritis and M. Mitrouli, Compound matrices: properties, numerical issues and analytical computations, Numer. Algorithms, 50 (2009), 155-177.
J. Geiser and C. Kravvaritis, A Domain Decomposition Method based on the Iterative Operator Splitting Method, Appl. Numer. Math., 59 (2009), 608-623.
C. Kravvaritis and M. Mitrouli, A technique for computing minors of binary Hadamard matrices and application to the Growth Problem, Electron. Trans. Numer. Anal., 31 (2008), 49-67.
J. Geiser and C. Kravvaritis, Overlapping operator splitting methods and applications in stiff differential equations, Neural Parallel Sci. Comput., 16 (2008), 189-200.
C. Kravvaritis and M. Mitrouli, An Algorithm to Find Values of Minors of Hadamard Matrices, Bull. Greek Math. Soc., 54 (2007), 221-238.
C. Kravvaritis and M. Mitrouli, Evaluation of Minors associated to weighing matrices, Linear Algebra Appl., 426 (2007), 774-809.
C. Kravvaritis, M. Mitrouli and J. Seberry, On the Pivot Structure for the Weighing Matrix W(12,11), Linear Multilinear Algebra, 55:5 (2007), 471-:490.
C. Kravvaritis and M. Mitrouli, Determinant Evaluations for Weighing Matrices, Int. J. Pure Appl. Math., 34:2 (2007), 163-176.
J. Geiser and C. Kravvaritis, Weighted Iterative Operator Splitting Methods and Applications, Lecture Notes in Comput. Sci., 4310 (2007), 48-55.
S. Georgiou and C. Kravvaritis, New Good Quasi-Cyclic Codes over GF(3), Int. J. Algebra, 1:1 (2007), 11-24.
C. Kravvaritis, M. Mitrouli and J. Seberry, Counting Techniques Specifying the Existence of Submatrices in Weighing Matrices, Lecture Notes in Comput. Sci., 3718 (2005), 294-305.
C. Kravvaritis, E. Lappas and M. Mitrouli, An algorithm to find values of minors of weighing matrices, Lecture Notes in Comput. Sci., 3401 (2005), 375-382.
C. Kravvaritis, M. Mitrouli and J. Seberry, On the growth problem for skew and symmetric conference matrices, Linear Algebra Appl., 403 (2005), 183-206.

Proceedings and reports

C. Kravvaritis, Analytical Formulas for Minors of Orthogonal Matrices and an Application, «ICTCAM ’07 – International Conference on Trends in Computational and Applied Mathematics», 237-240, (Bucharest – Romania, June 2007).
J. Geiser, C. Kravvaritis, Modified Jacobian Newton Iterative Method with Embedded Domain Decomposition Method, Preprint No. 2007-23, Department of Mathematics, Humboldt University of Berlin.
C. Kravvaritis, Growth Factors for Orthogonal (0,1,-1) Matrices, «Hellenic Conference on Mathematical Education», 531-541, (Kozani – Greece, November 2007).
C. Kravvaritis and M. Mitrouli, Optimization methods for the length and growth problems, «Numerical Analysis 2008», (Kalamata – Greece, September 2008).

Theses

Christos Kravvaritis, Weighing matrices and their contribution to the study of the growth problem, Master Thesis, University of Athens, 2004.
Christos Kravvaritis, A determinant computations framework for Weighing matrices and application to the growth problem, PhD Thesis, University of Athens, 2008.

Selected Publications


The growth factor of a Hadamard matrix of order 16 is 16, Numer. Linear Algebra Appl., 16 (2009), 715-743, with M. Mitrouli.
A technique for computing minors of binary Hadamard matrices and apllication to the Growth Problem, Electron. Trans. Numer. Anal., 31 (2008) 49-67, with M. Mitrouli.
Compound matrices: properties, numerical issues and analytical computations, Numer. Algorithms, 50 (2009), 155-177, with M. Mitrouli.
A Domain Decomposition Method based on the Iterative Operator Splitting Method, Appl. Numer. Math., 59 (2009), 608-623, with J. Geiser.
Evaluation of Minors associated to weighing matrices, Linear Algebra Appl., 426 (2007) 774-809, with M. Mitrouli.
On the Pivot Structure for the Weighing Matrix W(12,11), Linear Multrilinear Algebra, 34 (2007) 163-176, with M. Mitrouli and J. Seberry.
On the growth problem for skew and symmetric conference matrices, Linear Algebra Appl., 403 (2005) 183-206, with M. Mitrouli and J. Seberry.


Forthcoming conferences


83td annual meeting of GAMM, Darmstadt, Germany, 26-30 March 2012 [1]
SIAM Conference on Applied Linear Algebra, Valencia, Spain, 18-22 June 2012 [2]