Combinatorial optimization problems with quadratic objective function, in particular study of the Quadratic Traveling Salesman Problem.
Polyhedral combinatorics for polyhedra arising from linearization of a nonlinear objective function
Semidefinite relaxations of combinatorial optimization problems, in particular investigations of facility layout problems, especially double row facility layout problem
Matroid optimization problems with polynomial objective function
Application of optimization models and methods for problems in factory and logistics planning, in the wood industry as well as in mechanical engineering (process and process chain optimization, control of welding processes), mostly in the very large scale domain
Application of mathematical optimization in bioinformatics
Approaches for energy-sensitive production control
