Stephan Helfrich

11 papers Journal 11
YearRankTypeTitle / Venue / Authors
2026 J jnl
A Defender-Attacker-Defender Model for Optimizing the Resilience of Hospital Networks to Cyberattacks.
CoRR
Stephan Helfrich, Emilia Grass
2026 J jnl
Tractable but Hard to Approximate: The Bi-Objective Minimum s-t-Cut Problem With Binary Capacities.
Networks
Jan Boeckmann, Stephan Helfrich, Oliver Bachtler, Stefan Ruzika, Clemens Thielen
2025 J jnl
Efficiently Constructing Convex Approximation Sets in Multiobjective Optimization Problems.
INFORMS J. Comput.
Stephan Helfrich, Stefan Ruzika, Clemens Thielen
2024 J jnl
The Weighted p-Norm Weight Set Decomposition for Multiobjective Discrete Optimization Problems.
J. Optim. Theory Appl.
Stephan Helfrich, Kathrin Prinz, Stefan Ruzika
2024 J jnl
Using scalarizations for the approximation of multiobjective optimization problems: towards a general theory.
Math. Methods Oper. Res.
Stephan Helfrich, Arne Herzel, Stefan Ruzika, Clemens Thielen
2023 J jnl
Analysis of the weighted Tchebycheff weight set decomposition for multiobjective discrete optimization problems.
J. Glob. Optim.
Stephan Helfrich, Tyler A. Perini, Pascal Halffmann, Natashia Boland, Stefan Ruzika
2023 J jnl
Approximating biobjective minimization problems using general ordering cones.
J. Glob. Optim.
Arne Herzel, Stephan Helfrich, Stefan Ruzika, Clemens Thielen
2023 J jnl
Using Scalarizations for the Approximation of Multiobjective Optimization Problems: Towards a General Theory.
CoRR
Stephan Helfrich, Arne Herzel, Stefan Ruzika, Clemens Thielen
2022 J jnl
An approximation algorithm for a general class of multi-parametric optimization problems.
J. Comb. Optim.
Stephan Helfrich, Arne Herzel, Stefan Ruzika, Clemens Thielen
2021 J jnl
An Approximation Algorithm for a General Class of Multi-Parametric Optimization Problems.
CoRR
Stephan Helfrich, Arne Herzel, Stefan Ruzika, Clemens Thielen
2021 J jnl
Approximating Biobjective Minimization Problems Using General Ordering Cones.
CoRR
Arne Herzel, Stephan Helfrich, Stefan Ruzika, Clemens Thielen