1. Faculty of Industrial Technology, Nakhon Si Thammarat Rajabhat University, Nakhon Si Thammarat, Thailand
2. Research Center in Energy and Environment, Faculty of Science, Thaksin University (Phatthalung Campus), Phatthalung, Thailand
3. Faculty of Engineering, Thaksin University (Phatthalung Campus), Phatthalung, Thailand
4. School of Accountancy and Finance, Walailak University, Nakhon Si Thammarat, Thailand
5. Université de Moncton, Edmundston, New Brunswick, Canada