1. Santa Rita do Sapucaí - MG,Hitachi Kokusai Linear,Brazil
2. Instituto Nacional de Telecomunições - Inatel, Santa Rita do Sapucaí - MG,Brazil
3. Universidade Federal de Itajubá - Unifei, Itajubá - MG,Brazil
4. Technische Universität Chemnitz,Professorship of Communications Engineering,Germany