1. Associate Lecturer, Research Centre for Sustainable Technologies, Faculty of Engineering, Science and Computing, Swinburne Univ. of Technology, Sarawak Campus, 93350 Kuching, Sarawak, Malaysia.
2. Director (Acting), Research Centre for Sustainable Technologies, Faculty of Engineering, Science and Computing, Swinburne Univ. of Technology, Sarawak Campus, 93350 Kuching, Sarawak, Malaysia (corresponding author)