1. Universidad de La Salle—Engineering Faculty, Electrical Department , Campus La Candelaria, Bogota D.C. , Colombia
2. Aalborg University, Department of Planning , Rendsburggade 14, 9000 Aalborg , Denmark
3. University of Las Palmas de Gran Canaria, Department of Mechanical Engineering, Campus Universitario de Tafira , Las Palmas de Gran Canaria , Spain