1. PGMICRO - Institute of Informatics - Universidade Federal do Rio Grande do Sul (UFRGS),Porto Alegre,Brazil
2. Institute of Informatics - Universidade Federal do Rio Grande do Sul (UFRGS),Porto Alegre,Brazil
3. Federal University of Pampa,Campus Alegrete,Brazil
4. Universidade Federal de Santa Maria (UFSM),Electronics and Computing Department,Santa Maria,Brazil