Department of Electrical Physics;
University of Malaya;
Kuala Lumpur 50603;
Malaysia;
Faculty of Information Technology;
INTI International University;
Nilai 71800;
Malaysia;
Faculty of Electrical and Electronic Engineering Technology;
Universiti Teknikal Malaysia Melaka;
Melaka 76100;
Malaysia;
Department of Physics;
Faculty of Science and Technology;
Airlangga University;
Surabaya;
Indonesia;