1. PPgEEC1 Federal University of Rio Grande do Norte,Natal-RN,Brazil
2. Federal University of Rio Grande do Norte,Dept. of Computer Engineering and Automation,Natal-RN,Brazil
3. Federal University of Rio Grande do Norte,Dept. of Electrical Engineering,Natal-RN,Brazil
4. Federal University of Campina Grande,Dept. of Civil Engineering,Campina Grande-PB,Brazil