1. Faculty of Electrical Engineering, Universiti Teknologi Malaysia, Johor Bahru, Johor, Malaysia
2. School of Computer Science and Informatics, De Montfort University, Leicester, U.K.
3. Faculty of Computer Science and Engineering, Hodeidah University, Al Hudaydah, Yemen
4. School of Electrical and Electronic Engineering, Universiti Sains Malaysia, Nibong Tebal, Pulau Pinang, Malaysia