New proposals for modelling and solving the problem of covering solids using spheres of different radii
RAIRO - Operations Research - Recherche Opérationnelle, Tome 54 (2020) no. 3, pp. 873-882.

Given a solid T, represented by a compact set in ℝ3, the aim of this work is to find a covering of T by a finite set of spheres of different radii. Some level of intersection between the spheres is necessary to cover the solid. Moreover, the volume occupied by the spheres on the outside of T is limited. This problem has an application in the planning of a radio-surgery treatment known by Gamma Knife and can be formulated as a non-convex optimization problem with quadratic constraints and linear objective function. In this work, two new linear mathematical formulations with binary variables and a hybrid method are proposed. The hybrid method combines heuristic, data mining and an exact method. Computational results show that the proposed methods outperform the ones presented in the literature.

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DOI : 10.1051/ro/2019041
Classification : 90C10
Mots-clés : Problem of covering solids, mathematical programming, hybrid method 
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     author = {Gonz\'alez Silva, Pedro Henrique and Macambira, Ana Fl\'avia U. S. and Pinto, Renan Vicente and Simonetti, Luidi and Maculan, Nelson and Michelon, Philippe},
     title = {New proposals for modelling and solving the problem of covering solids using spheres of different radii},
     journal = {RAIRO - Operations Research - Recherche Op\'erationnelle},
     pages = {873--882},
     publisher = {EDP-Sciences},
     volume = {54},
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     year = {2020},
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}
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González Silva, Pedro Henrique; Macambira, Ana Flávia U. S.; Pinto, Renan Vicente; Simonetti, Luidi; Maculan, Nelson; Michelon, Philippe. New proposals for modelling and solving the problem of covering solids using spheres of different radii. RAIRO - Operations Research - Recherche Opérationnelle, Tome 54 (2020) no. 3, pp. 873-882. doi : 10.1051/ro/2019041. http://www.numdam.org/articles/10.1051/ro/2019041/

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