Diploma University of Ioannina M.SC. University of Ioannina

Costas Voglis Department of Computer Science University of Ioannina GR-45110 Ioannina, Greece phone: +30-26510-98834 email: voglis@cs.uoi.gr

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	Modelling and Intelligence,  High Performance Computing Laboratory
	Optima Group

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[Research Interests]

[Publications]

[Teaching Experience]

[Short CV]

[Software]

[Phd Dissertation ]

Research Interests

• Local Optimization
• Convex Quadratic Programming for bound constraints
• Trust region methods for bound constraints
• Hybrid Newton / Gauss-Newton method
• Global Optimization
• Adaptive probability for starting a local search
• Alternative, gaussian mixture approach for start point selection
• Spectral clustering approach with affinity matrix enrichment by gradient information
• Stopping rules for multistart based clustering methods
• Early start point rejection for unimportant (high function value) local minima
• A local search method with specific properties suitable for clustering global optimization
• Modelling Applications
• Parallel Implementation
• A summary of research interests (pdf file)

Publications

• Journal Papers
1. C. Voglis and I.E. Lagaris, A Global Optimization Approach to Neural Network Training, Neural, Parallel & Scientific Computations 14:231-240, 2006. (pdf)
2. M.G. Tsipouras, C. Voglis and D.I. Fotiadis, A Framework for Fuzzy Expert System Creation - Application to Cardiovascular Diseases, IEEE Transactions on Biomedical Engineering , (54):2089-2105, 2007. (pdf)
3. C.Papadopoulos and C. Voglis, Drawing Graphs using Modular Decomposition , Journal of Graph Algorithms and Applications , 11(2): 481-511, 2007. (pdf)
4. C. Voglis, I.E. Lagaris, M.L. Lekala, G.J. Rampho and S.A. Sofianos, Global minimization in few-body systems , Nuclear Physics, 790:655-658, 2007. (pdf)
5. C. Voglis and I.E. Lagaris, Towards ``Ideal Multistart''. A stochastic approach for locating the minima of a continuous function inside a bounded domain , Applied Mathematics and Computation , 213:1, 216-229, 2009. (pdf)
   
6. C. Voglis, P. Hadjidoukas, D.G. Papageorgiou and I. E. Lagaris, A Numerical Differentiation Library Exploiting Parallel Architectures , Computer Physics Communications , 180:8, 1404-1415, 2009 (pdf)
   
7. C. Voglis, K.E. Parsopoulos, D.G. Papageorgiou and I. E. Lagaris and M.N. Vrahatis, MEMPSODE: A global optimization software based on hybridization of population-based algorithms and local searches , Computer Physics Communications , 183:5, 1139-1154, 2012 (pdf)
   
8. C. Voglis, K.E. Parsopoulos and I. E. Lagaris, Particle swarm optimization with deliberate loss of information , Soft Computing-A Fusion of Methodologies and Applications , 1-20, 2012 (pdf)
   
• International Conferences
1. C. Voglis and S. A. Paschos, A Study on Intrusion Detection Techniques in a TCP/IP Environment ,3th WSEAS International Multiconference on Circuits, Systems, Communications and Computers , Athens, Greece, 1999.
2. C. Voglis and I.E. Lagaris, A Hybrid method for neural network training , 6th International Workshop on Mathematical methods in Scattering Theory and Biomedical Engineering , Tsepelovo, Greece, 2004.
3. C. Voglis and I. E. Lagaris, A Rectangular Trust Region Dogleg Approach for Unconstrained and Bound Constrained Nonlinear Optimization , WSEAS International Conference on Applied Mathematics , Corfu, Greece, 2004. (ps)
4. C. Voglis and I. E. Lagaris, A Rectangular Trust-Region Approach for Unconstrained and Box-Constrained Optimization Problems , International Conference of Computational Methods in Sciences and Engineering , Athens, Greece, 2004. (ps)
5. C. Voglis and I. E. Lagaris, BOXCQP: An Algorithm for Bound Constrained Convex Quadratic Problems , 1st International Conference "From Scientific Computing to Computational Engineering" , Athens, Greece, 2004. (pdf)
6. M.G. Tsipouras, C. Voglis, I.E. Lagaris and D.I. Fotiadis, A Framework for Fuzzy Expert System Creation , 7th International Workshop on Mathematical Methods in Scattering Theory and Biomedical Technology , Nymfaio, Greece, 2005.
7. C. Papadopoulos and C. Voglis, Drawing Graphs using Modular Decomposition , 13th Symposium on Graph Drawing GD2005 , Springer LNCS 3843:343-354, 2005. (pdf)
8. M.G. Tsipouras,  C. Voglis, I.E. Lagaris and D.I. Fotiadis, Cardiac arrythmia classification using support vector machines , The 3rd European Medical and Biological Engineering Conference , Prague, 2005.(pdf)
9. C. Voglis and I. E. Lagaris, Smeenos: A Clustered Particle Swarm Algorithm for Recovering the Local Minima of a Function , Optimization 2007 , Porto, Portugal, 2007. (ppt)
10. C. Voglis and I. E. Lagaris, Global Optimization by Adaptively Estimating the Probability for Local Search, Optimization 2007 , Porto, Portugal, 2007. (ppt)
11. N. Kyrgios, C. Voglis and I. E. Lagaris, Multistart Optimization with a Trainable Decision Maker for Avoiding High-Valued Local Minima , 3rd IC-EpsMsO, Athens, 8-11 July 2009. (pdf)
12. C. Voglis , P.E. Hadjidoukas, V.V. Dimakopoulos, I.E. Lagaris, Task-parallel global optimization with application to protein folding, High Performance Computing and Simulation (HPCS 2011), 186-192, 2011.
13. P.E. Hadjidoukas, C. Voglis , V.V. Dimakopoulos, I.E. Lagaris, High-performance numerical optimization on multicore clusters , Euro-Par 2011 Parallel Processing , 353-364, 2011. (pdf)
14. G.S. Piperagkas, C. Voglis , V.A. Tatsis, K.E. Parsopoulos and I.E. Lagaris, Applying PSO and DE on Multi--Item Inventory Problem with Supplier Selection , MIC 2011: The IX Metaheuristics International Conference , 2011. (pdf)
15. C. Voglis , G.S. Piperagkas, K.E. Parsopoulos, D.G. Papageorgiou and I.E. Lagaris MEMPSODE: Comparing Particle Swarm Optimization and Differential Evolution Within a Hybrid Memetic Global Optimization Framework, GECCO 2012:Genetic and Evolutionary Computation Conference (BBOB 2012 Workshop) , Philadelphia, 2012. (pdf)
16. C. Voglis , G.S. Piperagkas, K.E. Parsopoulos, D.G. Papageorgiou and I.E. Lagaris MEMPSODE: An Empirical Assessment of Local Search Algorithm Impact on a Memetic Algorithm Using Noiseless Testbed, GECCO 2012:Genetic and Evolutionary Computation Conference (BBOB 2012 Workshop) , Philadelphia, 2012. (pdf)
17. C. Voglis , P.E. Hadjidoukas, K.E. Parsopoulos, D.G. Papageorgiou and I.E. Lagaris, Adaptive Memetic Particle Swarm Optimization with Variable Local Search Pool Size , GECCO 2013:Genetic and Evolutionary Computation Conference , Amsterdam, 2013. (pdf)
18. C. Voglis Adapt-MEMPSODE: A Memetic Algorithm with Adaptive Selection of Local Searches , GECCO 2013:Genetic and Evolutionary Computation Conference (BBOB 2013 Workshop) , Amsterdam, 2013. (pdf)
19. C. Voglis , D.E. Papageorgiou and I.E. Lagaris Concurrent nomadic and bundle search: A class of parallel algorithms for local optimization , 10th International Conference on Parallel Processing and Applied Mathematics (PPAM 2013), Warsaw 2013. (pdf)

Teaching

• [10/1999-6/2007] Teaching assistant in undergraduate courses in Dept. of Computer Science, University of Ioannina.
• Introduction to Computers
• Introduction to Optimization
• [Fall 2006] Teaching assistant in the graduate course of Nonlinear Optimization
[Fall 2007] Teaching assistant in the graduate course of Continuous Global Optimization
• [10/2006-6/2007] Laboratory Assistant, Department of TeleInformatics & Management, Technological Educational Institute of Epirus.
• [09/2007] Assistant supervisor for B.Sc Dissertation entitled Global Optimization Using Bee Colonies
• [11/2007] Assistant supervisor for B.Sc Dissertation entitled Particle Swarm Global Optimization
• [03/2008] Assistant supervisor for B.Sc Dissertation entitled Global Optimization Using Interval Analysis
• [05/2008] Assistant supervisor for M.Sc Dissertation entitled An Application of Normal Distribution Sampling in Global Optimization

Software

• Merlin Optimization Environment
• Numerical Differentiation Library ([6]) (tar.gz)
• BOXCQP: Convex quadratic programming for bound constraints (fortran/matlab)
• ADAPT: Code from paper "Towards `Ideal Multistart`. A stochastic approach for locating the minima of a continuous function inside a bounded domain" (matlab)
• Clustered particle swarm (matlab)
• A local search suitable for Clustering Global Optimization (matlab)

Phd Dissertation

• Presentation in English
• Presentation in Greek
• Full text in English