1. School of Electrical and Electronic Engineering, Universiti Sains Malaysia, Engineering Campus, Nibong Tebal, Pulau Pinang, Malaysia
2. Department of Electronics and Communication Engineering, University of Baghdad, Baghdad, Iraq
3. Faculty of Oil and Minerals, University of Aden, Shabwa, Yemen
4. School of Urban Rail, Shandong Polytechnic, Jinan, Shandong, China