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Combinatorial Optimization and Logistics
The Combinatorial Optimization and Logistics (CSLog) group at the University of Bremen focuses on the analysis of discrete algorithmic problems that are computationally difficult. We analyze the structure of such problems and design efficient algorithms with provable performance guarantees for solving them. We are also interested in combinatorial optimization problems where the input is revealed only incrementally or where there is uncertainty in the parameters, and we develop online, stochastic or robust solution methods.
Combinatorial optimization is related to theoretical computer science, discrete mathematics, operations research, algorithm theory and computational complexity theory and has important applications in several fields. In our group we develop theoretic results and apply them to complex real-world environments. Typical applications include scheduling, production planning, logistics, network design, communication and routing in networks, and health care.
Contact
Combinatorial Optimization and Logistics
Faculty 3 - Mathematics and Computer Science
Prof. Dr. Nicole Megow
Bibliothekstr. 5
28359 Bremen
Secretary office
n.n.
Telefon: +49 (0) 421 218 63580
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News
Nov 28-29, 2024: Bremen Workshop on Combinatorial Reconfiguration and Beyond, organized by Nicole Megow, Daniel Schmand, and Sebastian Siebertz as part of their MMM Seed Project.
Nov 22, 2024: Alex Lindermayr successfully defended his PhD thesis "Unrelated Machine Scheduling in Different Information Models". Congratulations!
Nov 18, 2024: We are very happy to have Annette Lutz (TU Darmstadt) as a guests. She gave a talk about the "Incremental Prize-Collecting Steiner Tree Problem" in our research seminar.
Nov 6, 2024: We are excited to have Sarah Morell (TU Berlin) as a guest. She gave an interesting talk about the submodular Santa Claus problem in our research seminar.
Oct 14, 2024: Our paper "A Tight (3/2 + ε)-Approximation Algorithm for Demand Strip Packing" (Franziska Eberle, Felix Hommelsheim, Malin Rau, Stefan Walzer) got accepted at SODA 2025.
Oct 14, 2024: Our paper "The Power of Proportional Fairness for Non-Clairvoyant Scheduling under Polyhedral Constraints" (Sven J?ger, Alexander Lindermayr, Nicole Megow) got accepted at SODA 2025.
Sep 26, 2024: Our paper "Accelerating Matroid Optimization through Fast Imprecise Oracles" (Franziska Eberle, Felix Hommelsheim, Alexander Lindermayr, Zhenwei Liu, Nicole Megow, Jens Schl?ter) got accepted at NeurIPS 2024.
Sep 23-27, 2024: Our "Hands-On Tutorial on Optimization" will take place in MZH 5500, daily from 9am till 5pm. Special event on Wednesday: Talk with insights about Solving Optimization Problems in Practice by Industry Process Consultants from DELMIA Quintiq, Düsseldorf
Sep 1, 2024: PhD student Leoni Winschermann from the University of Twente joins our group as a research visitor for four months. Welcome!
August 1, 2024: Call for Papers for IPCO 2025 is out! Nicole Megow is the PC Chair. Please consider submitting!
July 31, 2024: We’re saying goodbye to Jens Schl?ter, who is leaving our group to join CWI in Amsterdam as a postdoc. Wishing him all the best, and we'll stay connected!
July 2, 2024: Paper accepted at APPROX 2024: Competitive Query Minimization for Stable Matching with One-Sided Uncertainty (Evripidis Bampis, Konstantinos Dogeas, Thomas Erlebach, Nicole Megow, Jens Schl?ter, Amitabh Trehan)
June 24, 2024: DFG funds our project on initiating new collaborations with researchers at Columbia University, NYU and Google.
June 23-28, 2024: Alex, Felix, Jens and former members of our group are participating in MAPSP 2024. This great event is being organized by our former group member, Kevin Schewior.
June 15, 2024: Kim Klause has the honor to present her Master's Thesis (supervised by Nicole Megow) at the Faculty's Graduation Ceremony 2024. She received one of the Faculty's Thesis Awards. Congratulations!
June 6, 2024: Nicole speaks about Minimalistic Predictions for Non-Clairvoyant Scheduling at Columbia University's Workshop on Algorithms with Predictions.
April 26, 2024: Our paper "The Bottom-Left Algorithm for the Strip Packing Problem" (Bart Zondervan and Stefan Hougardy) got accepted at IWOCA 2024.
April 19, 2024: Felix Hommelsheim became an Associate Junior Fellow at the Hanse-Wissenschaftskolleg (HWK) for a period of three years. As part of the program, he will organize an international workshop on the topic of “New Perspectives in Network Design.”
April 16, 2024: Paper accepted at ICALP 2024: Solution discovery via reconfiguration for problems in P (Mario Grobler, Stephanie Maaz, Nicole Megow, Amer E. Mouawad, Vijayaragunathan Ramamoorthi, Daniel Schmand, Sebastian Siebertz)
April 15, 2024: Nicole is visiting the Data Science Institute and IEOR (Industrial Engineering and Operations Research) group at Columbia University as an Adjunct Senior Research Scientist for three months.
April 10-12, 2024: Nicole speaks at the Workshop Women in Optimization 2024.
April 9, 2024: DSC Seed Grant supports a research stay at the Data Science Institute at Columbia University.
April 3-5, 2024: Nicole gives the EURO Plenary Talk at the 19th International Workshop on Project Management and Scheduling, PMS 2024.
April 5, 2024: Paper accepted at RTNS 2024: The Safe and Effective Use of Optimistic Period Predictions (Sanjoy Baruah, Pontus Ekberg, Alexander Lindermayr, Alberto Marchetti-Spaccamela, Nicole Megow, Leen Stougie)
April 2-3, 2024: Workshop on Matroid-Constrained Optimization Problems at Institut Henri Poincaré, Paris, organized by Kristóf Bérczi, Chien-Chung Huang and Nicole Megow.
April 1, 2024: Bart Zondervan joins our group as a new PhD student. Welcome!
April 1, 2024: We are proud that Felix Hommelsheim is serving as a interim professor at our faculty this semester.
Jan 23-26, 2024: Excited to have Moritz Buchem, Franziska Eberle and Jose Verschae as guests in Bremen for a small Workshop on Stochastic Scheduling.
Jan 22, 2024: Our paper Fast Combinatorial Algorithms for Efficient Sortation (Madison Van Dyk, Jochen Koenemann, Nicole Megow, Kim Klause) has been accepted for IPCO 2024.
October 11, 2023: Our paper "Santa Claus meets Makespan and Matroids: Algorithms and Reductions" (?tienne Bamas, Alexander Lindermayr, Nicole Megow, Lars Rohwedder, Jens Schl?ter) got accepted at SODA 2024!
July 4, 2023: Nicole won the University of Bremen award for outstanding PhD student supervision. Congratulations!
June 25, 2023: Our paper "Improved Approximation Algorithms for the Expanding Search Problem" (Svenja M. Griesbach, Felix Hommelsheim, Max Klimm, Kevin Schewior) got accepted at ESA 2023.
June 24, 2023: Our group is at Open Campus with a talk and combinatorics games in the pagoda.
June 23-26, 2023: Guochuan Zhang from Zhejiang University is visiting us.
June 21-22, 2023: We have the pleasure of hosting the DFG Fachkollegium Informatik.
June 12-14, 2023: We are excited to have Sanjoy Baruah, Alberto Marchetti-Spaccamela, and Leen Stougie as guests in Bremen for a small Workshop on Integrating Predictions in Real-time Scheduling.
May 10, 2023: Zhenwei Liu joins our group. Welcome!
April 25, 2023: Our paper "Speed-Oblivious Online Scheduling: Knowing (Precise) Speeds is not Necessary" (Alexander Lindermayr, Nicole Megow, Martin Rapp) got accepted at ICML 2023.
April 25, 2023: Our paper "Minimalistic Predictions to Schedule Jobs with Online Precedence Constraints" (Alexandra Lassota, Alexander Lindermayr, Nicole Megow, Jens Schl?ter) got accepted at ICML 2023.
April 24, 2023: Nicole is co-organizer of the ICALP 2023 Satellite Workshop: Workshop on Recent Trends in Online Algorithms (with Thomas Erlebach, Kazuo Iwama, Chung-Shou Liao). Please consider to participate!
April 21, 2023: Our paper "Matching Augmentation via Simultaneous Contractions" (Mohit Garg, Felix Hommelsheim, Nicole Megow) got accepted at ICALP 2023.
April 20, 2023: Our Paper "Sorting and Hypergraph Orientation under Uncertainty with Predictions" (Thomas Erlebach, Murilo Santos de Lima, Nicole Megow, Jens Schl?ter) got accepted at IJCAI 2023 (acceptance rate 15%).
April 5, 2023: Nicole is the PC chair of APPROX 2023. Please consider submitting. Deadline is May 5.