1. Faculty of Electrical and Electronic Engineering FKEE, Universiti Tun Hussein Onn Malaysia, Batu Pahat 86400, Malaysia
2. School of Engineering, Zurich University of Applied Sciences, Technikumstrasse 9, 8401 Winterthur, Switzerland
3. Faculty of Engineering, Universitas Negeri Malang, JL. Semarang 5 Malang, Malang 65145, Indonesia