1. Education, Science and Technology Federal Institute of Ceará; Cedro Ceará Brazil
2. Graduate Program in Applied Informatics; University of Fortaleza; Fortaleza Ceará Brazil
3. University Center Catholic of Quixadá; Quixadá Ceará Brazil
4. National Institute of Telecommunications (Inatel); Santa Rita do Sapucaí Minas Gerais Brazil
5. Instituto de Telecomunicações; Lisbon Portugal
6. ITMO University; Saint Petersburg Russia