TY - CHAP A1 - Koch, Thorsten ED - Haasis, Hans-Dietrich ED - Kopfer, Herbert ED - Schönberger, Jörn T1 - Rapid Mathematical Programming or How to Solve Sudoku Puzzles in a few Seconds T2 - Operations Research Proceedings 2005 Y1 - 2006 UR - http://opus.kobv.de/zib/volltexte/2005/884/ SP - 21 EP - 26 ER - TY - CHAP A1 - Achterberg, Tobias A1 - Heinz, Stefan A1 - Koch, Thorsten ED - Perron, Laurent ED - Trick, Michael T1 - Counting Solutions of Integer Programs Using Unrestricted Subtree Detection T2 - Integration of AI and OR Techniques in Constraint Programming for Combinatorial Optimization Problems, 5th International Conference, CPAIOR 2008 Y1 - 2008 UR - http://opus.kobv.de/zib/volltexte/2008/1092/ VL - 5015 SP - 278 EP - 282 PB - Springer ER - TY - CHAP A1 - Eisenblätter, Andreas A1 - Koch, Thorsten A1 - Martin, Alexander A1 - Achterberg, Tobias A1 - Fügenschuh, Armin A1 - Koster, Arie M.C.A. A1 - Wegel, Oliver A1 - Wessäly, Roland ED - Anandalingam, G. ED - Raghavan, S. T1 - Modelling Feasible Network Configurations for UMTS T2 - Telecommunications Network Design and Management Y1 - 2003 UR - http://opus.kobv.de/zib/volltexte/2002/684/ PB - Kluver ER - TY - CHAP A1 - Eisenblätter, Andreas A1 - Fügenschuh, Armin A1 - Geerdes, Hans-Florian A1 - Junglas, Daniel A1 - Koch, Thorsten A1 - Martin, Alexander ED - Ahr, Dino ED - Fahrion, Roland ED - Oswald, Marcus ED - Reinelt, Gerhard T1 - Optimisation Methods for UMTS Radio Network Planning T2 - Operation Research Proceedings 2003 Y1 - 2003 U6 - https://doi.org/10.1007/978-3-642-17022-5_5 SP - 31 EP - 38 PB - Springer ER - TY - CHAP A1 - Bley, Andreas A1 - Koch, Thorsten A1 - Wessäly, Roland ED - Kaindl, H. T1 - Large-Scale hierarchical networks: How to compute an optimal architecture? T2 - Networks 2004 Y1 - 2004 SN - 3-8007-2840-0 SP - 429 EP - 434 PB - VDE Verlag CY - Berlin ER - TY - CHAP A1 - Koch, Thorsten A1 - Wessäly, Roland ED - Elmer, Carl-Friedrich ED - von Hirschhausen, Christian T1 - Hierarchical Infrastructure Planning in Networks T2 - Proceedings of the 3rd Conference on Applied Infrastructure Research, 9. October 2004, Berlin Y1 - 2004 UR - http://opus.kobv.de/zib/volltexte/2004/818/ ER - TY - CHAP A1 - Hadjidimitriou, Natalia Selini A1 - Lippi, Marco A1 - Nastro, Raffaele A1 - Koch, Thorsten A1 - Mamei, Marco T1 - Short-Term Forecasting of Energy Consumption and Production in Local Energy Communities T2 - 2024 32nd International Conference on Enabling Technologies: Infrastructure for Collaborative Enterprises (WETICE) Y1 - 2024 U6 - https://doi.org/10.1109/WETICE64632.2024.00022 SP - 74 EP - 79 PB - IEEE ER - TY - CHAP A1 - Hadjidimitriou, Natalia Selini A1 - Koch, Thorsten A1 - Lippi, Marco A1 - Petkovic, Milena A1 - Mamei, Marco T1 - Analysis of the Impact of COVID-19 and Russo-Ukraine War on Natural Gas Flow Using Time Series Forecasting T2 - Preceedings of the 16th International Conference on Management of Digital Ecosystems Y1 - 2024 ER - TY - CHAP A1 - Pedersen, Jaap A1 - Hoppmann-Baum, Kai A1 - Zittel, Janina A1 - Koch, Thorsten T1 - Blending hydrogen into natural gas: An assessment of the capacity of the German gas grid T2 - Operations Research Proceedings 2021 N2 - In the transition towards a pure hydrogen infrastructure, repurposing the existing natural gas infrastructure is considered. In this study, the maximal technically feasible injection of hydrogen into the existing German natural gas transmission network is analysed with respect to regulatory limits regarding the gas quality. We propose a transient tracking model based on the general pooling problem including linepack. The analysis is conducted using real-world hourly gas flow data on a network of about 10,000 km length. Y1 - 2022 U6 - https://doi.org/https://doi.org/10.1007/978-3-031-08623-6_28 SP - 182 EP - 187 ER - TY - CHAP A1 - Rehfeldt, Daniel A1 - Koch, Thorsten T1 - Implications, conflicts, and reductions for Steiner trees T2 - Integer Programming and Combinatorial Optimization: 22th International Conference, IPCO 2021 Y1 - 2021 U6 - https://doi.org/10.1007/978-3-030-73879-2_33 SP - 473 EP - 487 ER - TY - CHAP A1 - Gleixner, Ambros A1 - Kempke, Nils-Christian A1 - Koch, Thorsten A1 - Rehfeldt, Daniel A1 - Uslu, Svenja T1 - First Experiments with Structure-Aware Presolving for a Parallel Interior-Point Method T2 - Operations Research Proceedings 2019 N2 - In linear optimization, matrix structure can often be exploited algorithmically. However, beneficial presolving reductions sometimes destroy the special structure of a given problem. In this article, we discuss structure-aware implementations of presolving as part of a parallel interior-point method to solve linear programs with block-diagonal structure, including both linking variables and linking constraints. While presolving reductions are often mathematically simple, their implementation in a high-performance computing environment is a complex endeavor. We report results on impact, performance, and scalability of the resulting presolving routines on real-world energy system models with up to 700 million nonzero entries in the constraint matrix. KW - block structure KW - energy system models KW - interior-point method KW - high performance computing KW - linear programming KW - parallelization KW - presolving KW - preprocessing Y1 - 2020 U6 - https://doi.org/10.1007/978-3-030-48439-2_13 SP - 105 EP - 111 PB - Springer International Publishing ET - 1 ER -