Gravvanis Georgios

RANK:	Professor
SECTOR:	Physics and Applied Mathematics Sector
LABORATORY:
EXPERTISE:	Applied Mathematics and Numerical Computing

CONTACT DETAILS

ADDRESS:	University Campus Kimmeria, Building A, 1st floor
E-MAIL:
TELEPHONE:	+30 25410 79759
PERSONAL WEBSITE:
CV:

SCIENTIFIC INTERESTS

His research interests are in Computational Methods – Mathematical Modelling and Applications, Parallel Computations – Design of parallel algorithmic methods, Mathematics of Computing – Numerical Algorithms – Mathematical Software and Sparse matrix technology and numerical solution of partial differential equations (finite difference method, finite element method, domain decomposition method, multigrid methods, e.t.c).

UNDERGRADUATE COURSES

Mathematical Software
Applied Numerical Analysis
Scientific Computing
Advanced Scientific Computing

POSTGRADUATE COURSES

SHORT CV

George A. Gravvanis received the Bachelor of Science with JointHonours in Science from University of Salford (Manchester, UK) in 1982, the Degree of Mathematics from National and Kapodistrian University Athens in 1986, Master of Science in Numerical of Analysis from Brunel University (London, U.K.) in 1984 and the Doctoral Degree (Ph.D) in Computing Sciences from the Department of Informatics of Athens University of Economics and Business in 1992.

Today he is Professor of Applied Mathematics and Numerical Computing with the Division of Physics and Applied Mathematics, Department of Electrical and Computer Engineering of Democritus University of Thrace. He has been Coordinator and Adjunct Faculty member for the course module “Introduction to Computer Science” and he is Coordinator and Adjunct Faculty member for the course module “Mathematics for Informatics I”, Hellenic Open University.

He has published over 200 papers in International Journals, International Conferences and chapter books with international publishing houses. He is member of Editorial Boards of International Journals. He has been Guest Editor/Co-Editor of Special Issues of International Journals. He has been a reviewer in a large number of international journals and conferences, as well as member of Scientific/Program Committee of Internationalconferences. Also he has been a reviewer with The Computing Reviews of ACM, Mathematical Reviews (AMS), Zentralblatt MATH.

On a professional basis he was Head of Department of Analysis and Programming, Directorate of Informatics, General Secretariat of Social Security, Ministry of Employment and Social Protection. He was Member of Greek Delegation to the program “TESS: TElematics in Social Security”, Social Security for the Migrant Workers, European Commission, Directorate General V, Employment, Industrial Relations and Social Affairs. Additionally he was Domain Expert to the Technical Commission on Data Processing, Social Security for migrant workers, European Commission, Directorate General V, Employment, Industrial Relations and Social Affairs and President of the Technical Commission on Data Processing, Social Security for migrant workers, European Commission, Directorate General V, Employment, Industrial Relations and Social Affairs, Hellenic Presidency 01-06/2003.

RESEARCH PROJECTS

Participation to the European Project CLOUDLIGHTNING funded by Η2020 – The Framework Programme for Research and Innovation (2014-2020) for the «Self-Organising, Self-Managing Heterogeneous Cloud – CloudLightning)» από 2/02/2015 έως 31/01/2018 – Principal Investigator.

SELECTED PUBLICATIONS

Α.-D.E. Lipitakis, G.A. Gravvanis, C.K. Filelis-Papadopoulos, S. Kotsiantis, D. Anagnostopoulos (2024): Sparse Approximate Pseudoinverse Preconditioning for Sparse Supervised Learning Problems with more Features than Samples, I.J. Artificial Intelligence Tools 33(04), 2450011
Salamanis A.I., Gravvanis G.A., Kotsiantis S.B., Giannoutakis K.M. (2023): A generic sparse regression imputation method for time series and tabular data, Knowledge based Systems 279, (2023) 110965
Natsiou A.A., Gravvanis G.A., Filelis-Papadopoulos C.K., Giannoutakis K.M. (2023): An Aggregation-based Algebraic Multigrid Method with Deflation Techniques and Modified Generic Factored Approximate Sparse Inverses, Mathematics 11(3): 640
Salamanis A.I., Gravvanis G.A., Kotsiantis S.B., Vrahatis M.N. (2023): Novel Sparse Feature Regression Method for Traffic Forecasting, International Journal of Artificial Intelligence Tools 32(1), 2350008, 2023
Α.Ι. Salamanis, A.-D.E. Lipitakis, G.A. Gravvanis, S. Kotsiantis, D. Anagnostopoulos (2021): An Adaptive Cluster-based Sparse Autoregressive Model for Large-Scale Multi-Step Traffic Forecasting, Expert Systems with Applications 180, 115093
Giannoutakis K.M, Filelis-Papadopoulos C.K., Gravvanis G.A., Tzovaras D. (2021): Evaluation of Self-Organizing and Self-Managing heterogeneous HPC clouds through discrete-time simulation, Concurrency and Computation: Practice and Experience 33(17), e6326
Lipitakis A.-D.E., Filelis-Papadopoulos C.K., Gravvanis G.A., Anagnostopoulos D. (2020): A note on parallel approximate pseudoinverse matrix techniques for solving linear least square problems, Journal of Computational Science 41, (2020) 101092
Moutafis B.E., Gravvanis G.A., Filelis-Papadopoulos C.K. (2020): On the design of two-stage multiprojection methods for distributed memory systems, J. of Supercomputing 76(11), 9063-9094
Moutafis B.E., Gravvanis G.A., Filelis-Papadopoulos C.K. (2020): Hybrid Multi-Projection method using Sparse Approximate Inverses on GPU clusters, Int. J. High Performance Computing Applications 34(3), 282-305
Grylonakis E.-N. G., Gravvanis G.A., Filelis-Papadopoulos C.K., Fokas A.S. (2019): A Parallel Unified Transform Solver based on Domain Decomposition for solving Linear Elliptic PDEs, The J. of Supercomputing 75, 4947-4985
Efthymiopoulos C., Kyziropoulos P.E., Paez R.I., Zouloumi K. and Gravvanis G.A. (2019): Manifold spirals, disc-halo interactions and the secular evolution in N-body models of barred galaxies, Monthly Notices of the Royal Astronomical Society (MNNRAS) 484(2), 1487-1505.
Grylonakis E.-N. G., Filelis-Papadopoulos C.K., Gravvanis G.A., Fokas A.S. (2019): An iterative spatial-stepping numerical method for linear elliptic PDE using the unified transform, J. Comput. Appl. Math. 352, 194-209.
Tselepidis N.A., Filelis-Papadopoulos C.K., Gravvanis G.A. (2019): Distributed algebraic tearing and interconnecting techniques, Numerical Algorithms, 82(3), pp 809-842.
Moutafis B.E., Filelis-Papadopoulos C.K. Gravvanis G.A. (2018): Hybrid Parallel Schur Complement Techniques based on Multi-Projection type methods, SIAM J. Sci. Comp. 40(4), C634 – C654