31.07.2020

Two papers accepted at ATMOS and WAOA

The ALGO 2020 Meeting combines the European Symposium on Algorithms (ESA) and a number of other specialized conferences and workshops. It will be held on September 7-10 co-organized by the University of Pisa. As one of those, the Symposium on Algorithmic Approaches for Transportation Modelling, Optimization, and Systems (ATMOS) is an international forum for researchers in the area of optimization methods and algorithms to facilitate planning and operational management of freight and passenger transportation and traffic. To this year's edition, we contribute a paper resulting from a close collaboration between the Algorithm Engineering Group and TomTom. The paper is the result of the 2020 Bachelor Project where we introduce a framework to formalize real-world strategic routing scenarios as algorithmic problems and study one of them in detail.

The Workshop on Approximation and Online Algorithms (WAOA), another part of the meeting, is an international workshop in the area of approximation and online algorithms. These are fundamental tools to deal with computationally hard problems and problems in which the input is gradually disclosed over time. The Algorithm Engineering group contributes one paper to this year's edition. This paper is the results of the Master Thesis of Ardalan Khazraei. It shows that the uniform cost-distance Steiner tree problem remains NP-hard even if all vertices are terminals rendering the Steiner tree into a spanning tree, and improves the constant factor approximation.

Clean Citation Style 005

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Bläsius, Thomas; Böther, Maximilian; Fischbeck, Philipp; Friedrich, Tobias; Gries, Alina; Hüffner, Falk; Kißig, Otto; Lenzner, Pascal; Molitor, Louise; Schiller, Leon; Wells, Armin; Wietheger, Simon A Strategic Routing Framework and Algorithms for Computing Alternative PathsAlgorithmic Approaches for Transportation Modelling, Optimization, and Systems (ATMOS) 2020: 10:1–10:14

[ Abstract ] [ BibTeX ] [ URL ] [ DOI ] [ Download ]

@inproceedings{blasius2020strategic,
  abstract = {Traditional navigation services find the fastest route for a single driver. Though always using the fastest route seems desirable for every individual, selfish behavior can have undesirable effects such as higher energy consumption and avoidable congestion, even leading to higher overall and individual travel times. In contrast, strategic routing aims at optimizing the traffic for all agents regarding a global optimization goal. We introduce a framework to formalize real-world strategic routing scenarios as algorithmic problems and study one of them, which we call Single Alternative Path (SAP), in detail. There, we are given an original route between a single origin–destination pair. The goal is to suggest an alternative route to all agents that optimizes the overall travel time under the assumption that the agents distribute among both routes according to a psychological model, for which we introduce the concept of Pareto-conformity. We show that the SAP problem is NP-complete, even for such models. Nonetheless, assuming Pareto-conformity, we give multiple algorithms for different variants of SAP, using multi-criteria shortest path algorithms as subroutines.Moreover, we prove that several natural models are in fact Pareto-conform. The implementation and evaluation of our algorithms serve as a proof of concept, showing that SAP can be solved in reasonable time even though the algorithms have exponential running time in the worst case.},
  author = {Bläsius, Thomas and Böther, Maximilian and Fischbeck, Philipp and Friedrich, Tobias and Gries, Alina and Hüffner, Falk and Kißig, Otto and Lenzner, Pascal and Molitor, Louise and Schiller, Leon and Wells, Armin and Wietheger, Simon},
  booktitle = {Algorithmic Approaches for Transportation Modelling, Optimization, and Systems (ATMOS)},
  keywords = {sys:relevantfor:ae alinagries arminwells atmos falkhueffner leonschiller louisemolitor maximilianboether ottokissig pascallenzner philippfischbeck simonwietheger thomasblaesius tobiasfriedrich year2020},
  pages = {10:1&ndash;10:14},
  title = {A Strategic Routing Framework and Algorithms for Computing Alternative Paths},
  volume = 85,
  year = 2020
}

Clean Citation Style 005

Held, Stephan; Khazraei, Ardalan An Improved Approximation Algorithm for the Uniform Cost-Distance Steiner Tree ProblemWorkshop on Approximation and Online Algorithms (WAOA) 2020: 189–203

[ Abstract ] [ BibTeX ] [ URL ]