1. College of Electronics and Information Engineering, Sichuan University, Chengdu 610064, China
2. Dipartimento di Informatica, Università degli Studi di Milano, Via Bramante 65, 26013 Crema, Italy
3. School of Electrical Engineering and Computer Science, University of Ottawa, 800 King Edward Avenue, Ottawa, ON, Canada K1N 6N5
4. Department of Embedded Systems Engineering, College of Information and Technology, Incheon National University, 119 Academy-ro, Yeonsu-gu, Incheon 22012, Republic of Korea