1. Energy Research Institute, Interdisciplinary Graduate Program, Nanyang Technological University, Singapore
2. Energy Research Institute, Nanyang Technological University, Singapore
3. School of Electrical and Electronic Engineering, Nanyang Technological University, Singapore
4. Departament d'Enginyeria Electrònica, Eléctrica i Automàtica, Universitat Rovira i Virgili, Tarragona, Spain
5. Department of Electrical, Electronic and Computer Engineering, University of Western Australia, Crawley, WA, Australia