Γ-opt Research Group
Γ-opt Research Group
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Publications
Efficient formulation and solution methods
Achieving Emission-Reduction Goals: Multi-Period Power-System Expansion under Short-Term Operational Uncertainty
Stochastic adaptive robust optimization is capable of handling short-term uncertainties in demand and variable renewable-energy sources …
Tuomas Rintamäki
,
Fabricio Oliveira
,
Afzal S. Siddiqui
,
Ahti Salo
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DOI
The p-Lagrangian relaxation for separable nonconvex MIQCQP problems
This paper presents a novel technique to compute Lagrangian bounds for nonconvex mixed-integer quadratically constrained quadratic …
Tiago Andrade
,
g_nikita-belyak
,
Andrew Eberhard
,
Silvio Hamacher
,
Fabricio Oliveira
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DOI
A two stage stochastic programming for asset protection routing and a solution algorithm based on the Progressive Hedging algorithm
In this paper, a two-stage stochastic programming model is developed for the asset protection routing problem (APRP) to be employed in …
Mahdi Bashiri
,
Erfaneh Nikzad
,
Andrew Eberhard
,
John Hearne
,
Fabricio Oliveira
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DOI
Efficient formulation for transportation scheduling of single refinery multiproduct pipelines
Multiproduct pipeline transportation scheduling is a complex operations research problem that is characterized by the movement of the …
Hossein Mostafaei
,
Pedro M. Castro
,
Fabricio Oliveira
,
Iiro Harjunkoski
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DOI
Wasserstein-Distance-Based Temporal Clustering for Capacity-Expansion Planning in Power Systems
As variable renewable energy sources are steadily incorporated in European power systems, the need for higher temporal resolution in …
Lucas Condeixa
,
Fabricio Oliveira
,
Afzal Siddiqui
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DOI
Combining Progressive Hedging with a Frank--Wolfe Method to Compute Lagrangian Dual Bounds in Stochastic Mixed-Integer Programming
We present a new primal-dual algorithm for computing the value of the Lagrangian dual of a stochastic mixed-integer program (SMIP) …
Natashia Boland
,
Jeffrey Christiansen
,
Brian Dandurand
,
Andrew Eberhard
,
Jeff Linderoth
,
James Luedtke
,
Fabricio Oliveira
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DOI
Combining penalty-based and Gauss-Seidel methods for solving stochastic mixed-integer problems
In this paper, we propose a novel decomposition approach (named PBGS) for stochastic mixed-integer programming (SMIP) problems, which …
Fabricio Oliveira
,
Jeffrey Christiansen
,
Brian Dandurand
,
Andrew Eberhard
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DOI
A parallelizable augmented Lagrangian method applied to large-scale non-convex-constrained optimization problems
We contribute improvements to a Lagrangian dual solution approach applied to large-scale optimization problems whose objective …
Natashia Boland
,
Jeffrey Christiansen
,
Brian Dandurand
,
Andrew Eberhard
,
Fabricio Oliveira
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DOI
Enhancing the normalized multiparametric disaggregation technique for mixed-integer quadratic programming
We propose methods for improving the relaxations obtained by the normalized multiparametric disaggregation technique (NMDT). These …
Tiago Andrade
,
Fabricio Oliveira
,
Silvio Hamacher
,
Andrew Eberhard
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DOI
A strategy based on convex relaxation for solving the oil refinery operations planning problem
Oil refining is one of the most complex activities in the chemical industry due to its nonlinear nature, which ruins the convexity …
Tiago Andrade
,
Gabriela Ribas
,
Fabricio Oliveira
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DOI
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