Publikasjonar
Hovedinnhold
2023
- A General Deep Reinforcement Learning Hyperheuristic Framework for Solving Combinatorial Optimization Problems
J Kallestad, R Hasibi, A Hemmati, K Sörensen
European Journal of Operational Research 2023;
2022
- Solving a Pick-up and Delivery Routing Problem for Fourth Party Logistics Providers
P Bucher Johannessen, A Hemmati, M Moshref-Javadi
International Transactions in Operational Research 2022;
- Polyhedral results and stronger Lagrangean bounds for stable spanning trees
P Samer, D Haugland
Optimization Letters, 2022.
- The Lagrangian, constraint qualifications and economics
SD Flåm, JJ Rückmann
Math. Methods Oper. Research 2022 ;Volum 96-2. s. 215-232
- Some properties of K-convex mappings in variable ordering settings
G Bouza Allende, D Hernandez Escobar, JJ Rückmann
Optimization, electronically published, DOI: https://doi.org/10.1080/02331934.2021.1937159
- A Story of Computational Science: Colonel Titus’ Problem from the 17th Century
T Steihaug
Axioms 2022; 11 (6), 287
2021
- A comparative analysis of synchronized truck-and-drone delivery models
M Moshref-Javadi, A Hemmati, M Winkenbach
Computers & Industrial Engineering 2021; 162, 107648
- Fixed cardinality stable sets
P Samer, D Haugland
Discrete Applied Mathematics 2021; 303, pp.137-148
- Optimization of reliable cyclic cable layouts in offshore wind farms
A Klein, D Haugland
Engineering Optimization 2021; 53(2), pp.258-276
- MPCC: Strong Stability of M-stationary Points
H Günzel, D Hernandez Escobar, JJ Rückmann
Set-Valued and Variational Analysis 2021; 29 (3), 645-659
- Strongly stable C-stationary points for mathematical programs with complementarity constraints
D Hernandez Escobar, JJ Rückmann
Mathematical Programming 2021; 189 (1), 339-377 On shared use of renewable stocks
NA Ekerhovd, SD Flåm, SI Steinshamn
European Journal of Operational Research 2021; 290 (3), 1125-1135
Games and cost of change
SD Flåm
Annals of Operations Research 2021; 301 (1), 107-119
Market equilibria and money
SD Flåm
Fixed Point Theory and Algorithms for Sciences and Engineering 2021; (1), 1-18
- Towards competitive equilibrium by double auctions.
SD Flåm
Pure and Applied Functional Analysis 2021 ;Volum 6.(6) s. 1211-1225
- Computational Science in the 17th Century. Numerical Solution of Algebraic Equations: Digit–by–Digit Computation
T Steihaug
Numerical Analysis and Optimization 2021;
2020
- A truck and drones model for last-mile delivery: A mathematical model and heuristic approachM Moshref-Javadi, A Hemmati, M WinkenbachApplied Mathematical Modelling 2020; 80, 290-318
- MPCC: Strongly stable C-stationary points when the number of active constraints is n+1D Hernandez Escobar, JJ RückmannOptimization 2020 ;Volum 69-5. s. 1039-1067
- Predicting the winners of Borda, Kemeny and Dodgson elections with supervised machine learning. H Kujawska, M Slavkovik, JJ RückmannIn: N. Bassiliades et al. (editors). Multi-Agent Systems and Agreement Technologies. 2020 Springer, New York. s. 440-458
Rights and rents in local commonsSD FlåmJournal of Mechanism and Institution Design 2020; 5 (1), 119-140
Emergence of price-taking behaviorSD FlåmEconomic Theory 2020; 70 (3), 847-870
Computational science in the eighteenth century. Test cases for the methods of Newton, Raphson, and Halley: 1685 to 1745T SteihaugNumerical Algorithms 2020; 83 (4), 1259-1275
2019
On offshore wind farm maintenance scheduling for decision support on vessel fleet compositionA Gutierrez-Alcoba, EMT Hendrix, G Ortega, EE Halvorsen-Weare, D HauglandEuropean Journal of Operational Research 2019; 279(1), pp.124-131
Integer programming formulations for the shared multicast tree problemM Ivanova, D HauglandJournal of Combinatorial Optimization 2019; Vol. 38(3), pp.927-956
Obstacle-aware optimization of offshore wind farm cable layoutsA Klein, D HauglandAnnals of Operations Research 2019; Vol. 272(1-2), pp.373-388
The matching relaxation for a class of generalized set partitioning problemsP Samer, E Cavalcante, S Urrutia, J OppenDiscrete Applied Mathematics, 2019, Volume 253, pp 153-166
Preface. Parametric Optimization and Related Topics XI (special issue)M Cervinka, JJ Rückmann, O Stein (guest-editors)Optimization 2019 ;Volum 68-2/3. s. 429-431
- Surrogate-based model parameter optimization based on gas explosion experimental dataAL Both, H Hisken, JJ Rückmann, T SteihaugEngineering Optimization 2019 ;Volum 51-2. s. 301-316
- A note on strict complementarity for the doubly nonnegative coneB Jargalsaikhan, JJ RückmannOptimization 2019 ;Volum 68-2/3. s. 457-464
- MPCC: On necessary conditions for the strong stability of C-stationary points D Hernandez Escobar, JJ RückmannOptimization 2019 ;Volum 68-2/3. s. 593-613
Generalized gradients, bid–ask spreads, and market equilibriumSD FlåmOptimization 2019; 68 (2-3), 579-592
Blocks of coordinates, stochastic programming, and marketsSD FlåmComputational Management Science 2019; 16 (1), 3-16
Primal-dual algorithms for semidefinite optimization problems based on kernel-function with trigonometric barrier termM El Ghami, G Wang, T SteihaugInternational Journal of Applied Mathematics 2019; 32 (2), 333
2018
- Minimizing the tracking error of cardinality constrained portfoliosP Mutunge, D HauglandComputers & Operations Research 2018 ;Volum 90. s. 33-41
- Area Protection in Adversarial Path-finding Scenarios with Multiple Mobile Agents on Graphs - A Theoretical and Experimental Study of Strategies for Defense CoordinationM Ivanova, P Surynek, K HirayamaProceedings of the 10th International Conference on Agents and Artificial Intelligence (ICAART), 184-191
- On measures, pricing and sharing of riskSD FlåmInvestigacion Operacional 2018;Volum 39.(3) s. 326-34
- Blocks of coordinates, stochastic programming, and marketsSD FlåmComputational Management Science, DOI: 10.1007/s10287-018-0303-3
- A parametrized stock-recruitment relationship derived from a slow-fast population dynamic modelU Schaarschmidt, T Steihaug, S SubbeyMathematics and Computers in Simulation 145, 171-185
Generation of K-convex test problems in variable ordering settingsG Bouza Allende, D Hernandez Escobar, JJ RückmannInvestigacion Operacional 39 (3)
On vector generalized semi-infinite programmingF Guerra Vazquez, LA Hernandez Rebollar, JJ RückmannInvestigacion Operacional 39 (3)
Variational Analysis and Optimization Theory (special issue)G Bouza Allende, JJ Rückmann, C Tammer (guest-editors)Investigacion Operacional 39 (3)
Approximating cube roots of integers after Heron’s Metrica III.20Steihaug, T. and Rogers, D.NORMAT (Nordic Mathematical Journal), 61(2)
A review of termination rules of an inexact primal-dual interior point method for linear programming problemsBaryamureeba, V., Steihaug, T., and El Ghami, M. Revista de Investigacion Operacional, Vol. 39, No. 3
2017
- Evaluating the importance of randomization in adaptive large neighborhood searchA Hemmati, LM HvattumInternational Transactions in Operational Research 24 (5), 929-942
- Response surfaces for advanced consequence models: Two approachesAL Braatz, H HiskenJournal of Loss Prevention in the Process Industries 49, 683-699
- Reaching Cournot-Walras EquilibriumSD Flåm, K GramstadESAIM: Proceedings and Surveys 57, 12-22
- Order books, markets and convex analysisSD FlåmOptimization 66 (8), 1413-1424
- A model for optimal fleet composition of vessels for offshore wind farm maintenance,A Gutierrez-Alcoba, G Ortega, EMT Hendrix, EE Halvorsen-Weare, D HauglandProcedia Computer Science 108, 1512-1521
- Point-based neighborhoods for sharp calmness constants in linear programmingMJ Canovas, J Parra, JJ Rückmann, FJ Toledo Set-Valued and Variational Analysis 25 (4), 757-772
On duality in multiobjective semi-infinite optimization F Guerra Vazquez, JJ Rückmann Optimization 66 (8), 1237-1249
A tutorial note on a convexification procedure in non-convex semi-infinite programming optimization JJ RückmannInvestigacion Operacional 38 (4), 309-319
ISORA 2015 (special issue)JE Martinez Legaz, E Ocana Anaya, JJ Rückmann (guest-editors) Optimization 66 (8)
A new parametric kernel function with trigonometric barrier term for convex quadratic symmetric cone optimizationWang, G.Q, El Ghami, M and Steihaug, T. Applied Analysis and Optimization
A New Parametric Kernel Function Yielding the Best Known Iteration Bonds of Interior Point Methods for the Cartesian P∗(κ)-SCLCP Cai, X.Z., Wang, D.Z., El Ghami, M; Steihaug, T., and Wang, G. Pacific Journal of Optimization
2016
- An iterative two-phase hybrid matheuristic for a multi-product short sea inventory-routing problemA Hemmati, LM Hvattum, M Christiansen, G LaporteEuropean Journal of Operational Research 252 (3), 775-788
- Response surfaces for advanced consequence models: two approachesAL Braatz, H Hisken11th International Symposium on Hazards, Prevention, and Mitigation of Industrial Explosions (XI ISHPMIE)
- Surrogate-based optimisation of model parameters for the improved modelling of industrial-scale gas explosionsAL Braatz, H Hisken, JJ Rückmann5th International Conference on Engineering Optimization (EngOpt 2016)
- The Shared Broadcast Tree Problem and MSTM IvanovaElectronic Notes in Discrete Mathematics 55, 5-8
- Shared Multicast Trees in Ad Hoc Wireless NetworksM IvanovaCombinatorial Optimization - 4th International Symposium (ISCO), 273-284
- Borch's theorem, equal margins, and efficient allocationSD FlåmInsurance, Mathematics & Economics 70, 162-168
- Noncooperative games, coupling constraints, and partial efficiencySD FlåmEconomic Theory Bulletin 4 (2), 213-229
- Monotonicity and market equilibriumSD FlåmSet-Valued and Variational Analysis 24 (3), 403-421
- Bilateral exchange and competitive equilibriumSD FlåmSet-Valued and Variational Analysis 24 (1), 1-11
- Pooling Problems with Polynomial-Time AlgorithmsD Haugland, EML HendrixJournal of Optimization Theory and Applications 170 (2), 591-615
- The computational complexity of the pooling problemD HauglandJournal of Global Optimization, 64 (2), 199-215
- A continuously differentiable turbine layout optimization model for offshore wind farmsA KleinEnergy Procedia, 94, 497-503
Tight semi-model-free bounds on (bilateral) CVA J Helmers, JJ Rückmann, R Werner In: K Glau et al. (editors), Innovations in Derivatives Markets, Springer, New York, 83-101
A tutorial note on multiobjective semi-infinite programmingJJ Rückmann Investigacion Operacional 37 (3), 216-225
On the final steps of Newton and higher order methodsSteihaug, T., and Suleiman, S. Optimization Letters, Vol. 10(2), pp 401-416
2015
- An effective heuristic for solving a combined cargo and inventory routing problem in tramp shippingA Hemmati, M Stålhane, LM Hvattum, H AnderssonComputers & Operations Research 64, 274-282
- Control of adsorption chillers by a gradient descent method for optimal cycle time allocationU Bau, AL Braatz, F Lanzerath, M Herty, A BardowInternational Journal of Refrigeration 56, 52-64
- Optimization models and methods for maritime cargo and inventory routing problemsA HemmatiNTNU
- Risk Measures, Convexity, and Max-Min ShortfallsSD FlåmJournal of Convex Analysis 22 (3), 603-626
- Liability Insurance and Choice of Cars: A Large Game ApproachSD Flåm, EG WolfstetterJournal of Public Economic Theory 17 (6), 943-963
- Ragnar Frisch and interior-point methodsO Bjerkholt, SD FlåmOptimization Letters 9 (6), 1053-1061
- Optimal intake and routing of floating oil rigs in the North SeaD Haugland, BP TjøstheimIn KG Murty (ed.): Case Studies in Operations Research: Applications of Optimal Decision Making, International Series in Operations Research & Management Science, 212, 315-336
- On a pooling problem with fixed network sizeD Haugland, EML HendrixLecture Notes in Computer Science, 9335, 328-342
- An Integer Programming Model for Branching Cable Layouts in Offshore Wind FarmsA Klein, D Haugland, J Bauer, M MommerAdvances in Intelligent Systems and Computing, 359 (1), 27-36
- Derivative-free optimization for population dynamic modelsU Schaarschmidt, T Steihaug, S SubbeyIn HA Le Thi, T Pham Dinh, NT Nguyen (eds.): Modelling, Computation and Optimization in Information Systems and Management Science, 391-402, Springer, Cham
- Multiobjective semi-infinite optimization: convexification and properly efficient points F Guerra Vazquez, JJ RückmannIn: GO Tost et al. (editors), Analysis, Modelling, Optimization, and Numerical Techniques, Springer, New York, 327-347
2014
- Benchmark suite for industrial and tramp ship routing and scheduling problemsA Hemmati, LM Hvattum, K Fagerholt, I NorstadINFOR: Information Systems and Operational Research 52 (1), 28-38
- A simulated annealing algorithm for routing problems with fuzzy constrainsMHF Zarandi, A Hemmati, S Davari, IB TurksenJournal of Intelligent & Fuzzy Systems 26 (6), 2649-2660
- Adversarial Cooperative Path-Finding: Complexity and AlgorithmsM Ivanova, P Surynek26th IEEE International Conference on Tools with Artificial Intelligence (ICTAI), 75-82
- Gradient differences and bilateral bartersSD Flåm, O Godal, A SoubeyranOptimization 63 (5), 693-712
- A cost minimization heuristic for the pooling problemM Alfaki, D HauglandAnnals of Operations Research, 222 (1), 73-87
- Modeling and forecasting stock recruitment: Current and future perspectivesS Subbey, JA Devine, U Schaarschmidt, RDM NashICES Journal of Marine Science 71 (8), 2307-2322
On the local representation of piecewise smooth equations as a Lipschitz manifoldD Dorsch, HT Jongen, JJ Rückmann, V Shikhman J. Math. Anal. Appl. 411, 916-930
On proper efficiency in multiobjective semi-infinite optimization F Guerra Vazquez, JJ Rückmann In: H Xu et al. (editors), Optimization and Control Techniques and Applications, Springer, New York, 115-135
Algorithm for forming derivative-free optimal methodsKhattri, SK., and Steihaug, T.Numerical Algorithms; Vol. 65(4) pp. 809-824
A Subclass of Generating Set Search with Convergence to Second-Order Stationary PointsAbramson, M., Frimannslund, L., and Steihaug, T.Optimization Methods and Software;Vol. 29(5)pp 900-918
2013
- Capacitated location-routing problem with time windows under uncertaintyMHF Zarandi, A Hemmati, S Davari, IB TurksenKnowledge-Based Systems 37, 480-489
- Adversarial Cooperative Path-Finding: A First ViewM Ivanova, P SurynekLate-Breaking Developments in the Field of Artificial Intelligence, 53-55
- Optimization methods for pipeline transportation of natural gas with variable specific gravity and compressibilityC Borraz-Sànchez, D HauglandTOP - an official journal of the Spanish Society of Statistics and Operations Research, 21 (3), 524-541
- Strong formulations for the pooling problemM Alfaki, D HauglandJournal of Global Optimization, 56 (3), 897-916
- A multi-commodity flow formulation for the generalized pooling problemM Alfaki, D HauglandJournal of Global Optimization, 56 (3), 917-937
MIDACO on MINLP Space Applications S Erb, M Gerdts, S Kemble, JJ Rückmann, M Schlüter Advances in Space Research 51 (7), 1116-1131
A note on logarithmic smoothing in semi-infinite optimization under reduction approach F Guerra Vazquez, JJ Rückmann Croatian OR Review 4, 19-30
Rate of convergence of higher order methodsSteihaug, T., and Suleiman, S.Applied Numerical Mathematics. Vol. 67, pp. 230–242
Graph models and their efficient implementation for sparse Jacobian matrix determinationHossain, S., and Steihaug, T.Discrete Applied Mathematics 2013; Vol. 161(12) pp. 1747-1754
Structure in Optimization: Factorable Programming and FunctionsHascoêt, L., Hossain, S., and Steihaug, T.In: Computer and Information Sciences III. pp. 449-458, Springer
Structured computation in optimization and Algorithmic DifferentiationHascoêt, L., Hossain, S., and Steihaug, T.ACM Communications in Computer Algebra; Vol. 46(3) Suppl. Issue: 181 pp. 94-95
Solving trust-region subproblem augmented with linear inequality constraintsBergmann, Ø., and Steihaug, T.Optimization Methods and Software; Vol. 28(1) pp. 26-36
Computational and Sensitivity Aspects of Eigenvalue-Based Methods for the Large-Scale Trust-Region SubproblemRojas, M., Fotland, B., and Steihaug, T. Optimization Methods and Software; Vol. 28(3) pp. 564-580
Global convergence and the Powell singular functionSteihaug, T., and Suleiman, S.Global Optimization; Vol. 56(3) pp. 845-853
Optimal Direct Determination of Sparse Jacobian Matrices Hossain, S., and Steihaug, T.Optimization Methods and Software; Vol. 28(6) pp.1218-1232
Sparse matrix computations with application to solving system of nonlinear equationsHossain, S., and Steihaug, T. Wiley Interdisciplinary Reviews: Computational Statistics; Vol. 5(5) pp. 372-386
Adaptive Curve TailoringSteihaug, T., and Wang, W. In: Information Sciences and Systems pp.3-13, Springer
2012
- Dual decomposition for computational optimization of minimum-power shared broadcast tree in wireless networksD Yuan, D HauglandIEEE Transactions on Mobile Computing, 11 (12), 2008-2019
- Computing the Optimal Layout of a Wind Farm.JK Haugland, D HauglandIn Norsk informatikkonferanse (NIK 2012), ISSN 1892-0713, Akademika forlag
- Parallel algorithms for the maximum flow problem with minimum lot sizesM Eleyat, D Haugland, ML Hetland, L NatvigOperations Research Proceedings 2011, 83-88, ISBN 978-3-642-29209-5, Springer
SIP: critical value functions have finite modulus of non-convexity D Dorsch, F Guerra Vazquez, H Günzel, HT Jongen, JJ RückmannMathematical Programming 136 (1), 133-154
Parametric Optimization and Related Topics X (special issue)JJ Rückmann, O Stein (guest-editors) Optimization 61 (6)
A numerical study of MIDACO on 100 MINLP benchmarks M Gerdts, JJ Rückmann, M Schlüter Optimization 61 (7), 873-900
On saddle points in nonconvex semi-infinite programmingF Guerra Vazquez, JJ Rückmann, R Werner J. Global Optimization 54 (3), 433-447
Parametric Optimization and Related Topics (special issue)JJ Rückmann, O Stein (guest-editors) Mathematical Programming 136 (1)
Semi-infinite programming: strong stability implies EMFCQ D Dorsch, F Guerra Vazquez, H Günzel, JJ Rückmann J. Convex Analysis 19 (4), 999-1008
On diagonally structured problems in unconstrained optimization using an inexact super Halley methodGundersen, G. and Steihaug, T.Journal of Computational and Applied Mathematics; Vol. 236(15) pp. 3685-3695
Interior-point methods for linear optimization based on a kernel function with a trigonometric barrier termEl Ghami, M., Guennoun, Z, Bouali, S., and Steihaug, T.Journal of Computational and Applied Mathematics; Vol. 236(15) pp. 3613-3623
Sparsity in higher order methods for unconstrained optimizationGundersen, G., and Steihaug, T.Optimization Methods and Software, Vol. 27(2), pp.275-294
2011
- The multi-depot capacitated location-routing problem with fuzzy travel timesMHF Zarandi, A Hemmati, S DavariExpert Systems with Applications 38 (8), 10075-10084
- Maximal covering location problem (MCLP) with fuzzy travel timesS Davari, MHF Zarandi, A HemmatiExpert Systems with Applications 38 (12), 14535-14541
- Minimizing fuel cost in gas transmission networks by dynamic programming and adaptive discretizationC Borraz-Sànchez, D HauglandComputers & Industrial Engineering, 61, 364-372
- Local search heuristics for the probabilistic dial-a-ride problemSC Ho, D HauglandOR Spectrum, 33 (4), 961-988
- The maximum flow problem with minimum lot sizesD Haugland, M Eleyat, ML HetlandLecture Notes in Computer Science, 6971, 170-182
- Semi-infinite programmingF Guerra Vazquez, JJ Rückmann In: J Cochran et al. (editors), Encyclopedia of Operations Research and ManagementScience, Wiley, Hoboken, 4770-4479
A Class of Methods Combining L-BFGS and Truncated NewtonFrimannslund, L., and Steihaug, T.In: Computer and Information Sciences II, pp. 565-570, Springer
On a New Method for Derivative Free OptimizationFrimannslund, L., and Steihaug, T.International Journal On Advances in Software; Vol. 4(3-4) pp. 244-255
2010
- The variable radius covering problem with fuzzy travel timesS Davari, MHF Zarandi, A Hemmati, IB TurksenFuzzy Systems (FUZZ), 2010 IEEE International Conference on, 1-6
- Fuzzy time series based on defining interval length with Imperialist Competitive AlgorithmMHF Zarandi, A Molladavoudi, A HemmatiFuzzy Information Processing Society (NAFIPS), 2010 Annual Meeting of the North American
- Fuzzy Clustering for Initialization of Simulated Annealing Algorithm to Solve a Capacitated Vehicle Routing ProblemMHF Zarandi, S Davari, A HemmatiProceedings of the 2010 International Conference on Industrial Engineering and Operations Management
- Feasibility testing for dial-a-ride problemsD Haugland, SC HoLecture Notes in Computer Science, 6124, 170-179
- An overview of models and solution methods for pooling problemsD HauglandIn E Bjørndal, M Bjørndal, PM Pardalos, M Rönnqvist (eds.): Energy, Natural Resources and Environmental Economics, 459-469, ISBN 978-3-642-12066-4, Springer
On interior logarithmic smoothing and strongly stable stationary points HT Jongen, JJ Rückmann SIAM J. Optimization 20 (5), 2137-2156
Joint routing, link scheduling and power control for wireless multi-hop networks for CDMA/TDMA systemsJJ Rückmann, M Sanchez Meraz, C Sosa PazCientifica 14 (4), 165-172
STA, The Space Trajectory Analysis Project - European Space Agency (ESA)G Ortega, S Erb, JJ Rückmann et al.Proceedings of the 4th International Conference on Astrodynamics Tools and Techniques, Madrid, Spain
Regression analysis for clusters in gene-environment networks based on ellipsoidal calculus and optimizationE Kropat, JJ Rückmann, GW Weber Dynamics of Continuous, Discrete and Impulsive Systems 17 (5), 639-657
A generic primal-dual interior-point method for semidefinite optimization based on a new class of kernel functionsEl Ghami, M., Roos, C., and Steihaug, T.Optimization Methods and Software; Vol. 25(3) 387-403
On large-scale unconstrained optimization problems and higher order methodsGundersen, G. and Steihaug,T.Optimization Methods and Software; Vol. 25(3) s. 227-358
Kernel-function Based Primal-Dual Algorithms for P*(k) Linear Complementarity ProblemsEl Ghami, M., Steihaug, T.Reserche operationelle; Vol. 44(3) p. 185-205
