Mohd Marzuki Mustafa Department of Electrical, Electronics and Systems Engineering Faculty of Engineering Universiti Kebangsaan Malaysia 43600 UKM Bangi, Selangor, MALAYSIA
Siti Rozaimah Sheikh Abdullah
Rakmi Abdul Rahman * Corresponding Author Department of Chemical and Process Engineering, Faculty of Engineering Universiti Kebangsaan Malaysia, 43600 UKM Bangi, Selangor, MALAYSIA