Imperial College London

DR PANOS PARPAS

Faculty of EngineeringDepartment of Computing

Senior Lecturer
 
 
 
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Contact

 

+44 (0)20 7594 8366panos.parpas Website

 
 
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Location

 

357Huxley BuildingSouth Kensington Campus

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Summary

 

Publications

Publication Type
Year
to

61 results found

Campos JS, Parpas P, 2018, A MULTIGRID APPROACH TO SDP RELAXATIONS OF SPARSE POLYNOMIAL OPTIMIZATION PROBLEMS, SIAM JOURNAL ON OPTIMIZATION, Vol: 28, Pages: 1-29, ISSN: 1052-6234

JOURNAL ARTICLE

Parpas P, Ralph D, Wiesemann W, 2018, Special issue: Optimization models and algorithms for data science PREFACE, MATHEMATICAL PROGRAMMING, Vol: 167, Pages: 1-3, ISSN: 0025-5610

JOURNAL ARTICLE

Hovhannisyan V, Panagakis Y, Zafeiriou S, Parpas Pet al., 2017, Multilevel Approximate Robust Principal Component Analysis, 16th IEEE International Conference on Computer Vision (ICCV), Publisher: IEEE, Pages: 536-544, ISSN: 2473-9936

CONFERENCE PAPER

Howe S, Parpas P, 2017, Error bounds on the solution to an optimal control problem over clustered consensus networks, Pages: 25-32

Copyright © by SIAM. In this paper, we obtain a bound on the error term of the solution to a control constrained, linear-quadratic optimal control problem over a clustered consensus network. For large scale systems, the solution may be regarded as com- putationally infeasible due to the increase in dimensionality. However, the two time-scale property of the network that arises from the cluster formation indicates that the optimal control problem can be written in standard singularly per- turbed form. Thus, we are able to obtain a reduced dimen- sion optimal control problem over a reduced dimension net- work where individual nodes within a cluster are collapsed into an aggregate node. The solution to the reduced problem can be shown to be asymptotically equivalent in the singular perturbation parameter to the solution of the original prob- lem. However, for many values of this asymptotic result may fail to be of practical use. We improve on this result by applying a duality theory to the clustered network and derive an upper bound u and lower bound l on the solution to the optimal control problem that holds for arbitrary and, furthermore, satisfies the inequality j u-l-j = O as 0.

CONFERENCE PAPER

Malki K, Tosto MG, Mourino-Talin H, Rodriguez-Lorenzo S, Pain O, Jumhaboy I, Liu T, Parpas P, Newman S, Malykh A, Carboni L, Uher R, McGuffin P, Schalkwyk LC, Bryson K, Herbster Met al., 2017, Highly Polygenic Architecture of Antidepressant Treatment Response: Comparative Analysis of SSRI and NRI Treatment in an Animal Model of Depression, AMERICAN JOURNAL OF MEDICAL GENETICS PART B-NEUROPSYCHIATRIC GENETICS, Vol: 174, Pages: 235-250, ISSN: 1552-4841

JOURNAL ARTICLE

Menke R, Abraham E, Parpas P, Stoianov Iet al., 2017, Extending the envelope of demand response provision though variable speed pumps, 18th International Conference on Water Distribution System Analysis (WDSA), Publisher: ELSEVIER SCIENCE BV, Pages: 584-591, ISSN: 1877-7058

CONFERENCE PAPER

Parpas P, 2017, A MULTILEVEL PROXIMAL GRADIENT ALGORITHM FOR A CLASS OF COMPOSITE OPTIMIZATION PROBLEMS, SIAM JOURNAL ON SCIENTIFIC COMPUTING, Vol: 39, Pages: S681-S701, ISSN: 1064-8275

JOURNAL ARTICLE

Baltean-Lugojan R, Parpas P, 2016, Robust Numerical Calibration for Implied Volatility Expansion Models, SIAM JOURNAL ON FINANCIAL MATHEMATICS, Vol: 7, Pages: 917-946, ISSN: 1945-497X

JOURNAL ARTICLE

Hovhannisyan V, Parpas P, Zafeiriou S, 2016, MAGMA: Multilevel Accelerated Gradient Mirror Descent Algorithm for Large-Scale Convex Composite Minimization, SIAM JOURNAL ON IMAGING SCIENCES, Vol: 9, Pages: 1829-1857, ISSN: 1936-4954

JOURNAL ARTICLE

Luong DVN, Parpas P, Rueckert D, Rustem Bet al., 2016, A Weighted Mirror Descent Algorithm for Nonsmooth Convex Optimization Problem, JOURNAL OF OPTIMIZATION THEORY AND APPLICATIONS, Vol: 170, Pages: 900-915, ISSN: 0022-3239

JOURNAL ARTICLE

Menke R, Abraham E, Parpas P, Stoianov Iet al., 2016, Demonstrating demand response from water distribution system through pump scheduling, APPLIED ENERGY, Vol: 170, Pages: 377-387, ISSN: 0306-2619

JOURNAL ARTICLE

Menke R, Abraham E, Parpas P, Stoianov Iet al., 2016, Exploring Optimal Pump Scheduling in Water Distribution Networks with Branch and Bound Methods, WATER RESOURCES MANAGEMENT, Vol: 30, Pages: 5333-5349, ISSN: 0920-4741

JOURNAL ARTICLE

Menke R, Abraham E, Parpas P, Stoianov Iet al., 2015, Approximation of system components for pump scheduling optimisation, Computing and Control for the Water Industry (CCWI2015)- Sharing the Best Practice in Water Management, Publisher: ELSEVIER SCIENCE BV, Pages: 1059-1068, ISSN: 1877-7058

CONFERENCE PAPER

Parpas P, Ustun B, Webster M, Quang KTet al., 2015, Importance Sampling in Stochastic Programming: A Markov Chain Monte Carlo Approach, INFORMS JOURNAL ON COMPUTING, Vol: 27, Pages: 358-377, ISSN: 1091-9856

JOURNAL ARTICLE

Wright R, Abraham E, Parpas P, Stoianov Iet al., 2015, Control of water distribution networks with dynamic DMA topology using strictly feasible sequential convex programming, WATER RESOURCES RESEARCH, Vol: 51, Pages: 9925-9941, ISSN: 0043-1397

JOURNAL ARTICLE

Wright R, Abraham E, Parpas P, Stoianov Iet al., 2015, Optimized control of pressure reducing valves in water distribution networks with dynamic topology, Computing and Control for the Water Industry (CCWI2015)- Sharing the Best Practice in Water Management, Publisher: ELSEVIER SCIENCE BV, Pages: 1003-1011, ISSN: 1877-7058

CONFERENCE PAPER

Wright R, Herrera M, Parpas P, Stoianov Iet al., 2015, Hydraulic resilience index for the critical link analysis of multi-feed water distribution networks, Computing and Control for the Water Industry (CCWI2015)- Sharing the Best Practice in Water Management, Publisher: ELSEVIER SCIENCE BV, Pages: 1249-1258, ISSN: 1877-7058

CONFERENCE PAPER

Wright R, Parpas P, Stoianov I, 2015, Experimental investigation of resilience and pressure management in water distribution networks, Computing and Control for the Water Industry (CCWI2015)- Sharing the Best Practice in Water Management, Publisher: ELSEVIER SCIENCE BV, Pages: 643-652, ISSN: 1877-7058

CONFERENCE PAPER

Ho CP, Parpas P, 2014, SINGULARLY PERTURBED MARKOV DECISION PROCESSES: A MULTIRESOLUTION ALGORITHM, SIAM JOURNAL ON CONTROL AND OPTIMIZATION, Vol: 52, Pages: 3854-3886, ISSN: 0363-0129

JOURNAL ARTICLE

Kuhn D, Parpas P, Rustem B, 2014, Stochastic Optimization of Investment Planning Problems in the Electric Power Industry, Process Systems Engineering, Pages: 215-230, ISBN: 9783527631209

© 2014 Wiley-VCH Verlag GmbH & Co. KGaA. All rights reserved. Decisions on whether to invest in new power system infrastructure can have farreaching consequences. The timely expansion of generation and transmission capacities is crucial for the reliability of a power system and its ability to provide uninterrupted service under changing market conditions.We consider a local (e.g., regional or national) power system which is embedded into a deregulated electricity market. Assuming a probabilistic model for future electricity demand, fuel prices, equipment failures, and electricity spot prices, we formulate a capacity expansion problem which minimizes the sum of the costs for upgrading the local power system and the costs for operating the upgraded system over an extended planning horizon. The arising optimization problem represents a two-stage stochastic program with binary first-stage decisions. Solution of this problem relies on a specialized algorithm which constitutes a symbiosis of a regularized decomposition method and a branch-and-bound scheme.

BOOK CHAPTER

Parpas P, Webster M, 2014, A stochastic multiscale model for electricity generation capacity expansion, EUROPEAN JOURNAL OF OPERATIONAL RESEARCH, Vol: 232, Pages: 359-374, ISSN: 0377-2217

JOURNAL ARTICLE

Parpas P, Wiesemann W, 2014, Editorial to computational techniques in management science, Computational Management Science, Vol: 11, Pages: 3-4, ISSN: 1619-697X

JOURNAL ARTICLE

Wright R, Stoianov I, Parpas P, 2014, Dynamic topology in water distribution networks, 12th International Conference on Computing-and-Control-for-the-Water-Industry (CCWI), Publisher: ELSEVIER SCIENCE BV, Pages: 1735-1744, ISSN: 1877-7058

CONFERENCE PAPER

Wright R, Stoianov I, Parpas P, Henderson K, King Jet al., 2014, Adaptive water distribution networks with dynamically reconfigurable topology, JOURNAL OF HYDROINFORMATICS, Vol: 16, Pages: 1280-1301, ISSN: 1464-7141

JOURNAL ARTICLE

Casale G, Ragusa C, Parpas P, 2013, A Feasibility Study of Host-Level Contention Detection by Guest Virtual Machines, 5th IEEE International Conference on Cloud Computing Technology and Science (IEEE CloudCom), Publisher: IEEE, Pages: 152-157, ISSN: 2330-2194

CONFERENCE PAPER

Kong FW, Parpas P, Rustem B, 2013, Sum of Non-Concave Utilities Maximization for MIMO Interference Systems, IEEE TRANSACTIONS ON WIRELESS COMMUNICATIONS, Vol: 12, Pages: 1744-1751, ISSN: 1536-1276

JOURNAL ARTICLE

Parpas P, Webster M, 2013, A stochastic minimum principle and an adaptive pathwise algorithm for stochastic optimal control, AUTOMATICA, Vol: 49, Pages: 1663-1671, ISSN: 0005-1098

JOURNAL ARTICLE

Tavares G, Parpas P, 2013, On the information-based complexity of stochastic programming, OPERATIONS RESEARCH LETTERS, Vol: 41, Pages: 622-626, ISSN: 0167-6377

JOURNAL ARTICLE

Luong DVN, Parpas P, Rueckert D, Rustem Bet al., 2012, Solving MRF Minimization by Mirror Descent, 8th International Symposium on Visual Computing (ISVC), Publisher: SPRINGER-VERLAG BERLIN, Pages: 587-598, ISSN: 0302-9743

CONFERENCE PAPER

Parpas P, Wiesemann W, 2012, Editorial, Computational Management Science, Vol: 9, Pages: 301-302, ISSN: 1619-697X

JOURNAL ARTICLE

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