Γ-opt Research Group
Γ-opt Research Group
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Publications
Efficient formulation and solution methods
ICNN-enhanced 2SP: Leveraging input convex neural networks for solving two-stage stochastic programming
Two-stage stochastic programming (2SP) offers a basic framework for modelling decision-making under uncertainty, yet scalability …
Yu Liu
,
Fabricio Oliveira
,
Jan Kronqvist
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Input convex neural networks as surrogates in mathematical optimisation
Embedding trained neural networks as surrogates within optimisation problems is an established practice in operations research. The …
Yu Liu
,
Jan Kronqvist
,
Fabricio Oliveira
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A Robust Optimization Approach to Flow Decomposition
In this paper, we generalize the minimum flow decomposition problem (MFD) to incorporate uncertain edge capacities and tackle it from …
Moritz Stinzendörfer
,
Philine Schiewe
,
Fabricio Oliveira
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Decision tree enhancer (DTE): Improving decision trees with optimization
Decision trees are off-the-shelf machine learning models widely used for classification and regression tasks in medical, logistics, …
Flávio Araújo Lim-Apo
,
Fabricio Oliveira
,
Silvio Hamacher
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An efficient mixed-integer linear programming formulation for solving influence diagrams
Influence diagrams represent decision-making problems with interdependencies between random events, decisions, and consequences. …
Topias Terho
,
Fabricio Oliveira
,
Ahti Salo
,
Pedro Munari
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Solving Influence Diagrams: Efficient Mixed-Integer Programming Formulation and Heuristic
In this paper, we propose novel mixed-integer linear programming (MIP) formulations to model decision problems posed as influence …
Helmi Hankimaa
,
Olli Herrala
,
Fabricio Oliveira
,
Jaan Tollander de Balsch
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Simulator-based surrogate optimisation employing adaptive uncertainty-aware sampling
Optimisation problems involving computationally expensive, black-box functions derived from high-fidelity engineering simulations …
Yu Liu
,
Fabricio Oliveira
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Solving decision problems with endogenous uncertainty and conditional information revelation using influence diagrams
Mathematical programming formulations of influence diagrams can bridge the gap between representing and solving decision problems. …
Olli Herrala
,
Tommi Ekholm
,
Fabricio Oliveira
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Employing federated learning for training autonomous HVAC systems
Buildings account for 40 % of global energy consumption. A considerable portion of building energy consumption stems from heating, …
Fredrik Hagström
,
Vikas Garg
,
Fabricio Oliveira
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Streamlining emergency response: A K-adaptable model and a column-and-constraint-generation algorithm
Emergency response refers to the systematic response to an unexpected, disruptive occurrence such as a natural disaster. The response …
Paula Weller
,
Fabricio Oliveira
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