1. Department of Artificial Intelligence, School of Informatics, Xiamen University, Xiamen, China
2. Institute of Mathematics, Physics and Computer Science, Aberystwyth University, Aberystwyth, U.K.
3. Department of Electrical Engineering, Yuan Ze University, Taoyuan, Taiwan
4. Faculty of Mechatronics and Electronics, Lac Hong University, Biên Hòa, Vietnam
5. Department of Computer and Information Sciences, Northumbria University, Newcastle upon Tyne, U.K.