1. National University of Laos,Faculty of Engineering,Dept. Computer Engineering and Information Technology,Vientiane Capital,Laos
2. National University of Laos,Faculty of Engineering,Dept. Electronic and Telecommunications Engineering,Vientiane Capital,Laos
3. Rambhai Barni Rajabhat University,Faculty of Industrail Technology,Chanthaburi,Thailand,22000
4. School of Engineering, King Mongkut's Institute of Technology Ladkrabang,Bangkok,Thailand,10520