Stephan Helfrich

According to our database, Stephan Helfrich authored at least 8 papers between 2022 and 2026.

Collaborative distances:

• Dijkstra number of four.
• Erdős number of four.

2026

A Defender-Attacker-Defender Model for Optimizing the Resilience of Hospital Networks to Cyberattacks.

Stephan Helfrich, Emilia Grass

CoRR, January, 2026

Tractable but Hard to Approximate: The Bi-Objective Minimum s-t-Cut Problem With Binary Capacities.

Jan Boeckmann, Stephan Helfrich, Oliver Bachtler, Stefan Ruzika, Clemens Thielen

Networks, 2026

2025

Efficiently Constructing Convex Approximation Sets in Multiobjective Optimization Problems.

Stephan Helfrich, Stefan Ruzika, Clemens Thielen

INFORMS J. Comput., 2025

2024

The Weighted p-Norm Weight Set Decomposition for Multiobjective Discrete Optimization Problems.

Stephan Helfrich, Kathrin Prinz, Stefan Ruzika

J. Optim. Theory Appl., September, 2024

Using scalarizations for the approximation of multiobjective optimization problems: towards a general theory.

Stephan Helfrich, Arne Herzel, Stefan Ruzika, Clemens Thielen

Math. Methods Oper. Res., August, 2024

2023

Approximating biobjective minimization problems using general ordering cones.

Arne Herzel, Stephan Helfrich, Stefan Ruzika, Clemens Thielen

J. Glob. Optim., June, 2023

Analysis of the weighted Tchebycheff weight set decomposition for multiobjective discrete optimization problems.

Stephan Helfrich, Tyler A. Perini, Pascal Halffmann, Natashia Boland, Stefan Ruzika

J. Glob. Optim., June, 2023

2022

An approximation algorithm for a general class of multi-parametric optimization problems.

Stephan Helfrich, Arne Herzel, Stefan Ruzika, Clemens Thielen

J. Comb. Optim., 2022