1. School of Electrical Systems Engineering, Universiti Malaysia Perlis (UniMAP), 02600 Arau, Perlis, Malaysia
2. School of Electronic, Electrical and Systems Engineering, Loughborough University, LEICS LE11 3TU, Loughborough, UK
3. Loughborough Design School, Loughborough University, LEICS LE11 3TU, Loughborough, UK