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Univ.Prof. Michael Mühlebach, PhD.

Univ.Prof. Michael Mühlebach, PhD.

michael.muehlebach@wu.ac.at
Research Interests & CV (Pure)Publications (Pure)

Research Interests

  • Foundations of machine learning

  • Large-language models (inference-time compute, data selection, reasoning/agentic systems)

  • Reinforcement learning and online decision-making

  • Mathematical optimization for machine learning

  • Control theory

Recent publications/preprints

  • H. Ma, M. Bal, L. Zhang, B. Li, N. He, M. Zeilinger, M. Muehlebach, "SALAAD: Sparse And Low-Rank Adaptation via ADMM for Large Language Model Inference," https://arxiv.org/abs/2602.00942 , 2026

  • M. Muehlebach, M. I. Jordan, "Accelerated First-Order Optimization under Nonlinear Constraints," Mathematical Programming, 2025,  https://arxiv.org/abs/2302.00316

  • L. Zhang, B. Li, K. K. Thekumparampil, S. Oh, M. Muehlebach, N. He, "Zeroth-Order Minimization finds Flat Minima," Advances in Neural Information Processing Systems, 2025, https://arxiv.org/abs/2506.05454v2

  • M. Muehlebach, Z. He, M. I. Jordan, "The Sample Complexity of Online Reinforcement Learning: A Multi-Model Perspective," International Conference on Learning Representations, 2026, https://arxiv.org/abs/2501.15910

Univ.Prof. Dr. Ivana Ljubic

Univ.Prof. Dr. Ivana Ljubic

ivana.ljubic@wu.ac.at
Research Interests & CV (Pure)Publications
ORCID
Google Scholar		Personal Website

Research Interests:

  • combinatorial optimization 

  • optimization under uncertainty

  • bilevel optimization

  • mixed integer (non)-linear programming

  • network design, logistics, transportation

Recent publications/preprints

  • Ivana Ljubić, Justo Puerto, Alberto Torrejon: Fair Vehicle Routing via Bilevel Optimization, Preprint, https://optimization-online.org/?p=33847, 2026

  • Horländer Andreas,Ivana Ljubić, Martin Schmidt: Using Disjunctive Cuts in a Branch-and-Cut Method to Solve Convex Integer Nonlinear Bilevel Problems, Preprint,  https://optimization-online.org/?p=25955, 2025

  • Alice Calamita, Ivana Ljubić, Laura Palagi: Benders decomposition for congested partial set covering location with uncertain demand, European Journal of Operational Research, Volume 330, Issue 1, 1 April 2026, Pages 26-46, DOI: 10.1016/j.ejor.2025.08.041, 2025

  • Yasmine Beck, Ivana Ljubić, Martin Schmidt: Heuristic Methods for Γ-Robust Mixed-Integer Linear Bilevel Problems, INFORMS Journal on Computing, Volume 38, Issue 1, Pages iv-xvi, 1-339, ii,  DOI: 10.1287/ijoc.2023.0239, 2025

  • Elena Fernández, Ivana Ljubić, Nicolás Zerega: The multi-commodity flow problem with outsourcing decisions, Transportation Research Part B: Methodological, Volume 201, November 2025, 103333,  DOI: 10.1016/j.trb.2025.103333, 2025