Fränk Plein
F.R.S.-FNRS Research Fellow (ASP)

I am a F.R.S.-FNRS Research Fellow doing my PhD in Computer Science at Université Libre de Bruxelles. I am a member of the Graphs and Mathematical Optimisation (GOM) workgroup.
My research interests lie amongst others in network optimisation, mixed-integer linear and nonlinear programming, combinatorial optimisation and bilevel optimisation.
My PhD project involves the optimisation of gas networks in the deregulated European entry-exit market system.

Master of Mathematics, deepening purpose
Mathematics Department, Université Libre de Bruxelles
  • Thesis: "Analysis of a Problem in Product Pricing",
  • Supervisor: Prof. Martine Labbé
  • Awarded with highest honours and jury's congratulations
Research interests
  • network optimisation
  • mixed-integer linear and nonlinear programming
  • combinatorial optimisation
  • bilevel optimisation
Submitted / Preprints
Journal Articles
  1. There's No Free Lunch: On the Hardness of Choosing a Correct Big-M in Bilevel Optimization
    jointly with Thomas Kleinert, Martine Labbé, and Martin Schmidt
    Accepted for publication (8/2019) in Operations Research
    Preprint (4/2019; last update: 8/2019): Optimization Online 
  2. Bookings in the European Gas Market: Characterisation of Feasibility and Computational Complexity Results
    jointly with Martine Labbé and Martin Schmidt
    In: Optimization and Engineering. 2019. Online First. DOI: 10.1007/s11081-019-09447-0
    Preprint (12/2018; last update 6/2019): Optimization Online
  3. A note on an induced subgraph characterization of domination perfect graphs
    jointly with Eglantine Camby
    In: Discrete Applied Mathematics. 2017. 217(3). Pages 711-717. DOI: 10.1016/j.dam.2016.09.040
  1. Analysis of a Problem in Product Pricing
    Master's thesis, Mathematics Department,
    Université Libre de Bruxelles