1. Department of Electrical and Electronic Engineering, Lee Kong Chian Faculty of Engineering and Science, Universiti Tunku Abdul Rahman, 43000 Kajang, Selangor, Malaysia
2. Center for Theoretical and Computational Physics, Department of Physics, Faculty of Science, University of Malaya, Kuala Lumpur 50603, Malaysia
3. School of Physics, Universiti Sains Malaysia, 11800 USM, Penang, Malaysia
4. Center for Foundation Studies, International University of Malaya-Wales, 50480 Kuala Lumpur, Malaysia
5. Faculty of Engineering, Multimedia University, Persiaran Multimedia, 63100 Cyberjaya, Selangor, Malaysia