EngOpt 2018 Proceedings of the 6th International Conference on Engineering Optimization - Rodrigues, H.C; Rodrigues, H.C; Herskovits, J.; Herskovits, J.; Mota Soares, C.M; Mota Soares, C.M; Araújo, A.L; Araújo, A.L; Guedes, J.M; Guedes, J.M; Folgado, J.O; Folgado, J.O; et al. (Springer International Publishing : Imprint: Springer, 2019)