Publications of D.G. Sotiropoulos

Publications

Journals

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M.S. Apostolopoulou, D.G. Sotiropoulos and C.A. Botsaris.

A curvilinear method based on minimal-memory BFGS updates.

Applied Mathematics and Computation, Vol. 217, No. 2, pp. 882-892, September 2010.

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M.S. Apostolopoulou, D.G. Sotiropoulos, C.A. Botsaris and P. Pintelas.

A practical method for solving large-scale TRS.

Optimization Letters, May 2010.

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S. Sioutas, D. Sofotassios, K. Tsichlas, D.G. Sotiropoulos and P. Vlamos.

Canonical polygon Queries on the plane: A new approach.

Journal of Computers, Vol. 4, No. 9, pp. 913-919, September 2009.

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M.S. Apostolopoulou, D.G. Sotiropoulos and P. Pintelas.

Solving the quadratic trust-region subproblem in a low-memory BFGS framework.

Optimization Methods and Software, Vol. 23, No. 5, pp. 651-674, October 2008.

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D.G. Sotiropoulos.

Solving discrete minimax problems using interval arithmetic.

Pacific Journal of Optimization, Vol. 2, No. 2, pp. 241-259, May 2006.

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D.G. Sotiropoulos and T.N. Grapsa.

Optimal centers in branch-and-prune algorithms for univariate global optimization.

Applied Mathematics and Computation, Vol. 169, No. 1, pp. 247-277, October 2005. (2 citations)

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D.G. Sotiropoulos, E.C. Stavropoulos and M.N. Vrahatis.

A new hybrid genetic algorithm for global optimization.

Nonlinear Analysis, Theory, Methods & Applications, Vol. 30, No. 7, pp. 4529-4538, December 1997. (15 citations)

Chapters in Books

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J. Diaz, G. Grammatikopoulos, A.C. Kaporis, L.M. Kirousis, X. Perez and D.G. Sotiropoulos.

5-Regular Graphs are 3-Colorable with Positive Probability.

Lecture Notes in Computer Science, ISBN: 978-3-540-29118-3, Volume 3669, pp. 215-225, October 2005.

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D.G. Sotiropoulos and T.N. Grapsa,

A branch-and-prune method for global optimization: The univariate case.

In: Scientific Computing, Validated Numerics, Interval Methods, W. Kraemer and J.W.v.Gudenberg (Eds.), pp. 215-226, ISBN: 978-0-306-46706-6, Kluwer, Boston, 2001.

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V.P. Plagianakos, D.G. Sotiropoulos and M.N. Vrahatis,

Integer weight training by differential evolution algorithms.

In: Recent Advances in Circuits and Systems, N.E. Mastorakis ed., pp. 327-331, World Scientific Publishing Co. Pte. Ltd., 1998.

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V.P. Plagianakos, D.G. Sotiropoulos and M.N. Vrahatis.

Automatic adaptation of learning rate for backpropagation neural networks.

In: Recent Advances in Circuits and Systems, N.E. Mastorakis ed., pp. 337-341, World Scientific Publishing Co. Pte. Ltd., 1998.

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M.N. Vrahatis, D.G. Sotiropoulos and E.C. Triantafyllou,

Global optimization for imprecise problems.

In: Developments in Global Optimization, I.M. Bomze, T. Csendes, R. Horst and P.M. Pardalos (Eds.), pp. 37-54, ISBN:978-0-7923-4351-6, Kluwer, The Netherlands, 1997. (4 citations)

Conference Proceedings

●	I.E. Livieris, M.S. Apostolopoulou, D.G. Sotiropoulos, S. Sioutas and P. Pintelas. Classification of Large Biomedical Data using ANNs based on BFGS method. In: Proceedings of the 13th Panhellenic Conference on Informatics (PCI 2009), 10-12th September 2009, Corfu, Greece, pp. 87-91, 2009.
●	I.E. Livieris, D.G. Sotiropoulos and P. Pintelas. On Descent Spectral CG algorithms for Training Recurrent Neural Networks. In: Proceedings of the 13th Panhellenic Conference on Informatics (PCI 2009), 10-12th September 2009, Corfu, Greece, pp. 65-69, 2009.
●	M.S. Apostolopoulou, D.G. Sotiropoulos, C.A. Botsaris and P. Pintelas, A nearly exact method for solving large-scale TRS. In: Proceedings of the 7th IEEE International Conference on Industrial Informatics (INDIN 2009), 24-26th June 2009, Cardiff UK, pp. 337-342, 2009.
●	M.S. Apostolopoulou, D.G. Sotiropoulos, I.E. Livieris and P. Pintelas, A memoryless BFGS neural network training algorithm. In: Proceedings of the 7th IEEE International Conference on Industrial Informatics (INDIN 2009), 24-26th June 2009, Cardiff UK, pp. 216-221, 2009.
●	M.S. Apostolopoulou, D.G. Sotiropoulos and C.A. Botsaris. Ελαχιστοποίηση Τετραγωνικών Συναρτήσεων που υπόκεινται σε ένα Τετραγωνικό Περιορισμό. In: Πρακτικά του 20ου Εθνικού Συνεδρίου της Ελληνικής Εταιρείας Επιχειρησιακών Ερευνών (20EEEE 2008), pp. 827-838, 2008.
●	M.S. Apostolopoulou, D.G. Sotiropoulos and C.A. Botsaris, A Curvilinear Method for Large Scale Optimization Problems. In: Proceedings of the 8th Hellenic European Research on Computer Mathematics and its Applications (HERCMA 2007), A.E. Lipitakis ed., ISBN: 978-960-88975-3-3, LEA Publishers, 2007.
●	D.G. Sotiropoulos and I.E. Livieris. A greedy approach to transversal selection for nonlinear systems of equations. In: Conference in Numerical Analysis (NumAn 2007), Recent Approaches to Numerical Analysis: Theory, Methods and Applications, September 3-7, 2007 Kalamata, Hellas, pp. 134-137, 2007.
●	I.A. Nikas, D.G. Sotiropoulos and T.N. Grapsa. Extending interval Newton method for nonlinear parameterized equations. In: Proceedings of International Conference on Numerical Analysis and Applied Mathematics 2006 (ICNAAM-2006), T.E. Simos, G. Psihoyios, Ch. Tsitouras (Eds.), ISBN:3-527-40743-X, pp. 512-515, Wiley-VCH Verlag, Weinheim, 2006.
●	D.G. Sotiropoulos. Solving discrete minimax problems using interval arithmetic. In: Proceedings of the Sixth International Conference on Optimization: Techniques and Applications (ICOTA6 2004), A. Rubinov and M. Sniedovich, ed., ISBN 1-876-85115-5, University of Ballarat, December 2004.
●	D.G. Sotiropoulos and T.N. Grapsa. An interval branch-and-prune algorithm for discrete minimax problems. In: Proceedings of International Conference on Numerical Analysis and Applied Mathematics 2004 (ICNAAM-2004) T.E. Simos and Ch. Tsitouras (Eds.), pp. 352-355, Wiley-VCH Verlag GmbH & Co., Weinheim, ISBN: 3-527-40563-1, 2004.
●	D.G. Sotiropoulos, A.E. Kostopoulos and T.N. Grapsa. Training neural networks using two-point stepsize gradient methods. In: Proceedings of International Conference on Numerical Analysis and Applied Mathematics 2004 (ICNAAM-2004) T.E. Simos and Ch. Tsitouras (Eds.), pp. 356-359, Wiley-VCH Verlag GmbH & Co., Weinheim, ISBN: 3-527-40563-1, 2004.
●	A.E. Kostopoulos, D. Glotsos, P. Spyridonos, G. Nikiforidis, D.G. Sotiropoulos and T.N. Grapsa. Comparative evaluation of feedforward and probabilistic neural networks for the automatic classification of brain tumours. In: Proceedings of the 1st International Conference "From Scientific Computing to Computational Engineering", Demos T. Tsahalis ed., Athens, 8-10 September, Vol. I, pp. 309-315, Patras University Press, ISBN: 9605300699, 2004.
●	A.E. Kostopoulos, D.G. Sotiropoulos and T.N. Grapsa. A new efficient variable learning rate for Perry's spectral conjugate gradient training method. In: Proceedings of the 1st International Conference "From Scientific Computing to Computational Engineering", Demos T. Tsahalis ed., Athens, 8-10 September, Vol. I, pp. 67-73, Patras University Press, ISBN: 9605300699, 2004.
●	G.E. Manoussakis, D.G. Sotiropoulos, T.N. Grapsa and C.A. Botsaris. A non-monotone dimension-reducing conic method for unconstrained optimization. In: Proceedings of the 1st International Conference "From Scientific Computing to Computational Engineering", Demos T. Tsahalis ed., Athens, 8-10 September, Vol. I, pp. 74-81, Patras University Press, ISBN: 9605300699, 2004.
●	G.E. Manoussakis, D.G. Sotiropoulos, C.A. Botsaris, and T.N. Grapsa. A nonmonotone conic method for unconstrained optimization. In: Proceedings of 4th GRACM Congress on Computational Mechanics (CRACM2002), Prof. Demos T. Tsahalis ed., Vol. I, pp. 172-179, 2002.
●	D.G. Sotiropoulos, A.E. Kostopoulos and T.N. Grapsa. A spectral version of Perry's conjugate gradient method for neural network training. In: Proceedings of 4th GRACM Congress on Computational Mechanics (CRACM2002), Prof. Demos T. Tsahalis ed., Vol. I, pp. 291-298, 2002.
●	D.G. Sotiropoulos, J.A. Nikas and T.N. Grapsa. Improving the efficiency of a polynomial system solver via a reordering technique. In: Proceedings of 4th GRACM Congress on Computational Mechanics (CRACM2002), Prof. Demos T. Tsahalis ed., Vol. III, pp. 970-976, 2002.
●	D.G. Sotiropoulos, V.P. Plagianakos and M.N. Vrahatis. An evolutionary algorithm for minimizing multimodal functions. In: Proceedings of the Fifth Hellenic- European Conference on Computer Mathematics and its Applications (HERCMA 2001), E.A. Lipitakis ed., Vol. 2, pp. 496-500, LEA Press, 2002.
●	D.G. Sotiropoulos and T.N. Grapsa. An interval branch and bound algorithm for global optimization using pruning steps. In: Proceedings of the Fifth Hellenic- European Conference on Computer Mathematics and its Applications (HERCMA 2001), E.A. Lipitakis ed., Vol. 2, pp.455-459, LEA Press, 2002.

Technical Reports

●	M.S. Apostolopoulou, D.G. Sotiropoulos, C.A. Botsaris and P. Pintelas. A practical method for solving large-scale TRS. Department of Mathematics, University of Patras, Technical Report No. 09-01, pages 1-23, March 2009.
●	M.S. Apostolopoulou, D.G. Sotiropoulos and P. Pintelas. A 2-BFGS updating in a trust region framework. Department of Mathematics, University of Patras, Technical Report No. 07-01, pages 1-29, June 2007.
●	D.G. Sotiropoulos, J.A. Nikas and T.N. Grapsa, Improving the efficiency of a polynomial system solver via a reordering technique. Department of Mathematics, University of Patras, Technical Report No. 02-03, 2002.
●	D.G. Sotiropoulos, A.E. Kostopoulos and T.N. Grapsa. A spectral version of Perry's conjugate gradient method for neural network training, Department of Mathematics, University of Patras, Technical Report No. 02-04, 2002.
●	V.P. Plagianakos, D.G. Sotiropoulos and M.N. Vrahatis. A nonmonotone backpropagation training method for neural networks , Department of Mathematics, University of Patras, Technical Report No. 98-04, 1998.
●	D.G. Sotiropoulos, V.P. Plagianakos and M.N. Vrahatis. An evolutionary algorithm for minimizing multimodal functions. Department of Mathematics, University of Patras, Technical Report No. 98-03, 1998.
●	V.P. Plagianakos, D.G. Sotiropoulos and M.N. Vrahatis. An improved backpropagation method with adaptive learning rate. Department of Mathematics, University of Patras, Technical Report No. 98-02, 1998.
●	V.P. Plagianakos, D.G. Sotiropoulos and M.N. Vrahatis. Evolutionary algorithms for integer weight neural network training. Department of Mathematics, University of Patras, Technical Report No. 98-01, 1998.



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Dimitris G. Sotiropoulos, Ph.D.

Publications