Publications
Main content
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
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 approach
M Moshref-Javadi, A Hemmati, M Winkenbach
Applied Mathematical Modelling 2020; 80, 290-318
- MPCC: Strongly stable C-stationary points when the number of active constraints is n+1
D Hernandez Escobar, JJ Rückmann
Optimization 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 Rückmann
In: N. Bassiliades et al. (editors). Multi-Agent Systems and Agreement Technologies. 2020 Springer, New York. s. 440-458
Rights and rents in local commons
SD Flåm
Journal of Mechanism and Institution Design 2020; 5 (1), 119-140
Emergence of price-taking behavior
SD Flåm
Economic Theory 2020; 70 (3), 847-870Computational science in the eighteenth century. Test cases for the methods of Newton, Raphson, and Halley: 1685 to 1745
T Steihaug
Numerical Algorithms 2020; 83 (4), 1259-1275
2019
On offshore wind farm maintenance scheduling for decision support on vessel fleet composition
A Gutierrez-Alcoba, EMT Hendrix, G Ortega, EE Halvorsen-Weare, D Haugland
European Journal of Operational Research 2019; 279(1), pp.124-131
Integer programming formulations for the shared multicast tree problem
M Ivanova, D Haugland
Journal of Combinatorial Optimization 2019; Vol. 38(3), pp.927-956
Obstacle-aware optimization of offshore wind farm cable layouts
A Klein, D Haugland
Annals of Operations Research 2019; Vol. 272(1-2), pp.373-388
The matching relaxation for a class of generalized set partitioning problems
P Samer, E Cavalcante, S Urrutia, J Oppen
Discrete 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 data
AL Both, H Hisken, JJ Rückmann, T Steihaug
Engineering Optimization 2019 ;Volum 51-2. s. 301-316
- A note on strict complementarity for the doubly nonnegative cone
B Jargalsaikhan, JJ Rückmann
Optimization 2019 ;Volum 68-2/3. s. 457-464
- MPCC: On necessary conditions for the strong stability of C-stationary points
D Hernandez Escobar, JJ Rückmann
Optimization 2019 ;Volum 68-2/3. s. 593-613
Generalized gradients, bid–ask spreads, and market equilibrium
SD Flåm
Optimization 2019; 68 (2-3), 579-592
Blocks of coordinates, stochastic programming, and markets
SD Flåm
Computational Management Science 2019; 16 (1), 3-16Primal-dual algorithms for semidefinite optimization problems based on kernel-function with trigonometric barrier term
M El Ghami, G Wang, T Steihaug
International Journal of Applied Mathematics 2019; 32 (2), 333
2018
- Minimizing the tracking error of cardinality constrained portfolios
P Mutunge, D Haugland
Computers & 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 Coordination
M Ivanova, P Surynek, K Hirayama
Proceedings of the 10th International Conference on Agents and Artificial Intelligence (ICAART), 184-191
- On measures, pricing and sharing of risk
SD Flåm
Investigacion Operacional 2018;Volum 39.(3) s. 326-34
- Blocks of coordinates, stochastic programming, and markets
SD Flåm
Computational Management Science, DOI: 10.1007/s10287-018-0303-3
- A parametrized stock-recruitment relationship derived from a slow-fast population dynamic model
U Schaarschmidt, T Steihaug, S Subbey
Mathematics and Computers in Simulation 145, 171-185 Generation of K-convex test problems in variable ordering settings
G Bouza Allende, D Hernandez Escobar, JJ Rückmann
Investigacion Operacional 39 (3)
On vector generalized semi-infinite programming
F Guerra Vazquez, LA Hernandez Rebollar, JJ Rückmann
Investigacion 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.20
Steihaug, 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 problems
Baryamureeba, 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 search
A Hemmati, LM Hvattum
International Transactions in Operational Research 24 (5), 929-942
- Response surfaces for advanced consequence models: Two approaches
AL Braatz, H Hisken
Journal of Loss Prevention in the Process Industries 49, 683-699
- Reaching Cournot-Walras Equilibrium
SD Flåm, K Gramstad
ESAIM: Proceedings and Surveys 57, 12-22
- Order books, markets and convex analysis
SD Flåm
Optimization 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 Haugland
Procedia Computer Science 108, 1512-1521
- Point-based neighborhoods for sharp calmness constants in linear programming
MJ 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 Rückmann
Investigacion 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 optimization
Wang, 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 problem
A Hemmati, LM Hvattum, M Christiansen, G Laporte
European Journal of Operational Research 252 (3), 775-788
- Response surfaces for advanced consequence models: two approaches
AL Braatz, H Hisken
11th 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 explosions
AL Braatz, H Hisken, JJ Rückmann
5th International Conference on Engineering Optimization (EngOpt 2016)
- The Shared Broadcast Tree Problem and MST
M Ivanova
Electronic Notes in Discrete Mathematics 55, 5-8
- Shared Multicast Trees in Ad Hoc Wireless Networks
M Ivanova
Combinatorial Optimization - 4th International Symposium (ISCO), 273-284
- Borch's theorem, equal margins, and efficient allocation
SD Flåm
Insurance, Mathematics & Economics 70, 162-168
- Noncooperative games, coupling constraints, and partial efficiency
SD Flåm
Economic Theory Bulletin 4 (2), 213-229
- Monotonicity and market equilibrium
SD Flåm
Set-Valued and Variational Analysis 24 (3), 403-421
- Bilateral exchange and competitive equilibrium
SD Flåm
Set-Valued and Variational Analysis 24 (1), 1-11
- Pooling Problems with Polynomial-Time Algorithms
D Haugland, EML Hendrix
Journal of Optimization Theory and Applications 170 (2), 591-615
- The computational complexity of the pooling problem
D Haugland
Journal of Global Optimization, 64 (2), 199-215
- A continuously differentiable turbine layout optimization model for offshore wind farms
A Klein
Energy 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 programming
JJ Rückmann
Investigacion Operacional 37 (3), 216-225
On the final steps of Newton and higher order methods
Steihaug, 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 shipping
A Hemmati, M Stålhane, LM Hvattum, H Andersson
Computers & Operations Research 64, 274-282
- Control of adsorption chillers by a gradient descent method for optimal cycle time allocation
U Bau, AL Braatz, F Lanzerath, M Herty, A Bardow
International Journal of Refrigeration 56, 52-64
- Optimization models and methods for maritime cargo and inventory routing problems
A Hemmati
NTNU
- Risk Measures, Convexity, and Max-Min Shortfalls
SD Flåm
Journal of Convex Analysis 22 (3), 603-626
- Liability Insurance and Choice of Cars: A Large Game Approach
SD Flåm, EG Wolfstetter
Journal of Public Economic Theory 17 (6), 943-963
- Ragnar Frisch and interior-point methods
O Bjerkholt, SD Flåm
Optimization Letters 9 (6), 1053-1061
- Optimal intake and routing of floating oil rigs in the North Sea
D Haugland, BP Tjøstheim
In 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 size
D Haugland, EML Hendrix
Lecture Notes in Computer Science, 9335, 328-342
- An Integer Programming Model for Branching Cable Layouts in Offshore Wind Farms
A Klein, D Haugland, J Bauer, M Mommer
Advances in Intelligent Systems and Computing, 359 (1), 27-36
- Derivative-free optimization for population dynamic models
U Schaarschmidt, T Steihaug, S Subbey
In 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 Rückmann
In: 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 problems
A Hemmati, LM Hvattum, K Fagerholt, I Norstad
INFOR: Information Systems and Operational Research 52 (1), 28-38
- A simulated annealing algorithm for routing problems with fuzzy constrains
MHF Zarandi, A Hemmati, S Davari, IB Turksen
Journal of Intelligent & Fuzzy Systems 26 (6), 2649-2660
- Adversarial Cooperative Path-Finding: Complexity and Algorithms
M Ivanova, P Surynek
26th IEEE International Conference on Tools with Artificial Intelligence (ICTAI), 75-82
- Gradient differences and bilateral barters
SD Flåm, O Godal, A Soubeyran
Optimization 63 (5), 693-712
- A cost minimization heuristic for the pooling problem
M Alfaki, D Haugland
Annals of Operations Research, 222 (1), 73-87
- Modeling and forecasting stock recruitment: Current and future perspectives
S Subbey, JA Devine, U Schaarschmidt, RDM Nash
ICES Journal of Marine Science 71 (8), 2307-2322
On the local representation of piecewise smooth equations as a Lipschitz manifold
D 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 methods
Khattri, SK., and Steihaug, T.
Numerical Algorithms; Vol. 65(4) pp. 809-824
A Subclass of Generating Set Search with Convergence to Second-Order Stationary Points
Abramson, 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 uncertainty
MHF Zarandi, A Hemmati, S Davari, IB Turksen
Knowledge-Based Systems 37, 480-489
- Adversarial Cooperative Path-Finding: A First View
M Ivanova, P Surynek
Late-Breaking Developments in the Field of Artificial Intelligence, 53-55
- Optimization methods for pipeline transportation of natural gas with variable specific gravity and compressibility
C Borraz-Sànchez, D Haugland
TOP - an official journal of the Spanish Society of Statistics and Operations Research, 21 (3), 524-541
- Strong formulations for the pooling problem
M Alfaki, D Haugland
Journal of Global Optimization, 56 (3), 897-916
- A multi-commodity flow formulation for the generalized pooling problem
M Alfaki, D Haugland
Journal 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 methods
Steihaug, T., and Suleiman, S.
Applied Numerical Mathematics. Vol. 67, pp. 230–242
Graph models and their efficient implementation for sparse Jacobian matrix determination
Hossain, S., and Steihaug, T.
Discrete Applied Mathematics 2013; Vol. 161(12) pp. 1747-1754
Structure in Optimization: Factorable Programming and Functions
Hascoêt, L., Hossain, S., and Steihaug, T.
In: Computer and Information Sciences III. pp. 449-458, Springer
Structured computation in optimization and Algorithmic Differentiation
Hascoêt, 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 constraints
Bergmann, 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 Subproblem
Rojas, M., Fotland, B., and Steihaug, T.
Optimization Methods and Software; Vol. 28(3) pp. 564-580
Global convergence and the Powell singular function
Steihaug, 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 equations
Hossain, S., and Steihaug, T.
Wiley Interdisciplinary Reviews: Computational Statistics; Vol. 5(5) pp. 372-386
Adaptive Curve Tailoring
Steihaug, 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 networks
D Yuan, D Haugland
IEEE Transactions on Mobile Computing, 11 (12), 2008-2019
- Computing the Optimal Layout of a Wind Farm.
JK Haugland, D Haugland
In Norsk informatikkonferanse (NIK 2012), ISSN 1892-0713, Akademika forlag
- Parallel algorithms for the maximum flow problem with minimum lot sizes
M Eleyat, D Haugland, ML Hetland, L Natvig
Operations 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 Rückmann
Mathematical 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 programming
F 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 method
Gundersen, 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 term
El 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 optimization
Gundersen, 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 times
MHF Zarandi, A Hemmati, S Davari
Expert Systems with Applications 38 (8), 10075-10084
- Maximal covering location problem (MCLP) with fuzzy travel times
S Davari, MHF Zarandi, A Hemmati
Expert Systems with Applications 38 (12), 14535-14541
- Minimizing fuel cost in gas transmission networks by dynamic programming and adaptive discretization
C Borraz-Sànchez, D Haugland
Computers & Industrial Engineering, 61, 364-372
- Local search heuristics for the probabilistic dial-a-ride problem
SC Ho, D Haugland
OR Spectrum, 33 (4), 961-988
- The maximum flow problem with minimum lot sizes
D Haugland, M Eleyat, ML Hetland
Lecture Notes in Computer Science, 6971, 170-182
- Semi-infinite programming
F Guerra Vazquez, JJ Rückmann
In: J Cochran et al. (editors), Encyclopedia of Operations Research and Management
Science, Wiley, Hoboken, 4770-4479
A Class of Methods Combining L-BFGS and Truncated Newton
Frimannslund, L., and Steihaug, T.
In: Computer and Information Sciences II, pp. 565-570, Springer
On a New Method for Derivative Free Optimization
Frimannslund, 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 times
S Davari, MHF Zarandi, A Hemmati, IB Turksen
Fuzzy Systems (FUZZ), 2010 IEEE International Conference on, 1-6
- Fuzzy time series based on defining interval length with Imperialist Competitive Algorithm
MHF Zarandi, A Molladavoudi, A Hemmati
Fuzzy 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 Problem
MHF Zarandi, S Davari, A Hemmati
Proceedings of the 2010 International Conference on Industrial Engineering and Operations Management
- Feasibility testing for dial-a-ride problems
D Haugland, SC Ho
Lecture Notes in Computer Science, 6124, 170-179
- An overview of models and solution methods for pooling problems
D Haugland
In 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 systems
JJ Rückmann, M Sanchez Meraz, C Sosa Paz
Cientifica 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 optimization
E 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 functions
El 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 methods
Gundersen, 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 Problems
El Ghami, M., Steihaug, T.
Reserche operationelle; Vol. 44(3) p. 185-205
