Dennis Michaels

Solving Mixed-Integer Nonlinear Optimization Problems using Simultaneous Convexification – a Case Study for Gas Networks

  • Frauke Liers
  • Maximilian Merkert
  • Alexander Martin
  • Nick Mertens
  • Dennis Michaels
    • Categories Applications - Science and Engineering, Global Optimization, Network Optimization Tags , , ,

    Solving mixed-integer nonlinear optimization problems (MINLPs) to global optimality is extremely challenging. An important step for enabling their solution consists in the design of convex relaxations of the feasible set. Known solution approaches based on spatial branch-and-bound become more effective the tighter the used relaxations are. Relaxations are commonly established by convex underestimators, where each … Read more

    Mixed-Integer Linear Methods for Layout-Optimization of Screening Systems in Recovered Paper Production

  • Armin Fügenschuh
  • Christine Hayn
  • Dennis Michaels
    • Categories (Mixed) Integer Nonlinear Programming, Mechanical Engineering Tags , , , , , ,

    The industrial treatment of waste paper in order to regain valuable fibers from which recovered paper can be produced, involves several steps of preparation. One important step is the separation of stickies that are normally attached to the paper. If not properly separated, remaining stickies reduce the quality of the recovered paper or even disrupt … Read more