1. Campus Tamaulipas Cinvestav Ciudad Victoria Tamaulipas Mexico
2. Universidad Autónoma de San Luis Potosı(UASLP) San Luis Potosi Mexico
3. Department of Electrical Engineering Autonomous Metropolitan University (UAM) Iztapalapa Mexico
4. Computer Science Instituto Nacional de Astrofisica, Optica y Electronica (INAOE) Puebla Mexico