Cycle-based formulations in Distance Geometry
Open Journal of Mathematical Optimization, Volume 4 (2023), article no. 1, 16 p.

The distance geometry problem asks to find a realization of a given simple edge-weighted graph in a Euclidean space of given dimension K, where the edges are realized as straight segments of lengths equal (or as close as possible) to the edge weights. The problem is often modelled as a mathematical programming formulation involving decision variables that determine the position of the vertices in the given Euclidean space. Solution algorithms are generally constructed using local or global nonlinear optimization techniques. We present a new modelling technique for this problem where, instead of deciding vertex positions, the formulations decide the length of the segments representing the edges in each cycle in the graph, projected in every dimension. We propose an exact formulation and a relaxation based on a Eulerian cycle. We then compare computational results from protein conformation instances obtained with stochastic global optimization techniques on the new cycle-based formulation and on the existing edge-based formulation. While edge-based formulations take less time to reach termination, cycle-based formulations are generally better on solution quality measures.

Published online:
DOI: 10.5802/ojmo.18
Classification: 90C26,  51K05
Keywords: Mathematical Programming, cycle basis, protein conformation
Leo Liberti 1; Gabriele Iommazzo 2; Carlile Lavor 3; Nelson Maculan 4

1 LIX CNRS Ecole Polytechnique, Institut Polytechnique de Paris, 91128 Palaiseau, France
2 Zuse Institute Berlin, Berlin, 14195, Germany
3 IMECC, University of Campinas, Brazil
4 COPPE, Federal University of Rio de Janeiro (UFRJ), Brazil
License: CC-BY 4.0
Copyrights: The authors retain unrestricted copyrights and publishing rights
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Leo Liberti; Gabriele Iommazzo; Carlile Lavor; Nelson Maculan. Cycle-based formulations in Distance Geometry. Open Journal of Mathematical Optimization, Volume 4 (2023), article  no. 1, 16 p. doi : 10.5802/ojmo.18.

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