Christos Kravvaritis

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

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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

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List of Publications

Refereed Publications

C. Kravvaritis and M. Mitrouli, The growth factor of a Hadamard matrix of order 16 is 16, 2009, Numer. Linear Algebra Appl., to appear.

C. Kravvaritis and M. Mitrouli, Compound matrices: properties, numerical issues and analytical computations, Numer. Algorithms, (2009), 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.

Papers in refereed conference proceedings

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).

C. Kravvaritis, Growth Factors for Orthogonal (0,1,-1) Matrices, «Hellenic Conference on Mathematical Education», 531-541, (Kozani – Greece, November 2007).

Submitted papers

J. Geiser and C. Kravvaritis, An Operator Splitting method with embedded Newton method. (J. Comput. Appl. Math.) - February 2008

J. Geiser and C. Kravvaritis, Extended Iterative Operator Splitting methods for stiff problems and applications. (J. Comput. Appl. Math.) - July 2008

C. Kravvaritis and M. Mitrouli, On some numerical properties of Hadamard matrices. (Appl. Numer. Math.) - December 2008

C. Kravvaritis, Determinant Evaluations for Binary Circulant Matrices. (Electron. J. Linear Algebra) - January 2009

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.

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Selected Publications

The growth factor of a Hadamard matrix of order 16 is 16, Numer. Linear Algebra Appl., 2009, to appear, 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, (2009), 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.

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Forthcoming conferences

M3ST 09, 3-5 September 2009, Poros island, Greece[1]
9. GAMM Workshop on Applied and Numerical Linear Algebra, September 10-11, 2009, Zürich, Switzerland [2]
ICNAAM 2009, 18-22 September 2009, Rethymno, Creta island, Greece [3]
Modelling and Development of Intelligent Systems, October 22-25, 2009, Sibiu, Romania [4]
HERCMA 2009, September 24-26, 2009, University of Economics & Business, Athens, Greece [5]
SIAM Conference on Applied Linear Algebra, 26-29 October 2009, Monterey, California [6]
Coimbra Meeting on 0-1 Matrix Theory and Related Topics, June 17-19, 2010, Coimbra, Portugal [7]
Sixteenth Conference of the International Linear Algebra Society, 21-25 June 2010, Pisa, Italy [8]