1. Faculty of Engineering, Department of Mechanical Engineering, University of Malaya, Kuala Lumpur, Malaysia
2. Department of Mechanical Engineering, Gadjah Mada University, Yogyakarta, Indonesia
3. Department of Manufacturing and Materials Engineering, International Islamic University Malaysia, Kuala Lumpur, Malaysia
4. Faculty of Science, Department of Chemistry, University of Malaya, Kuala Lumpur, Malaysia