1. Universitas Andalas,Engineering Faculty,Electrical Engineering Department,Padang City,Indonesia
2. Sekolah Tinggi Ilmu Kesehatan, MERCUBAKTIJAYA,Padang City,Indonesia
3. University of Nottingham Malaysia,Electrical and Electronic Engineering Department,Selangor,Malaysia
4. School of Electrical Engineering and Informatics, Institut Teknologi Bandung,Bandung City,Indonesia