Institution: | (1) Institute of Industrial and Control Engineering, Universitat Politècnica de Catalunya, Avda. Diagonal 647 planta 11, 08028 Barcelona, Spain. E-mail:;(2) Department of Applied Mathematics 4, Universitat Politècnica de Catalunya, Jordi Girona 1-3, modul C-3, 08034 Barcelona, Spain.;(3) Department of Electric Enginery, CINVESTAV IPN, Avda. Instituto Politécnico Nacional 2508, Col. S. Pedro Zacatenco, 07300, Mexico D.F |