Affiliation: | a UTM RAZAK School of Advanced Engineering and Technology, UTM International Campus, Universiti Teknologi Malaysia, Jalan Semarak, 54100 Kuala Lumpur, Malaysia b Institute of Respiratory Medicine, Kuala Lumpur, Jalan Pahang, 50586 Kuala Lumpur, Malaysia c Faculty of Elect. Eng., Universiti Teknologi Malaysia, 81310 Skudai, Johor, Malaysia d Institute of Mathematical Science, University of Malaya, Lembah Pantai, 50603 Kuala Lumpur, Malaysia |