1. Key Laboratory of E&M, Zhejiang University of Technology, Ministry of Education and Zhejiang Province, Hangzhou 310014, China
2. Department of Informatics, University of Hamburg, 22527 Hamburg, Germany
3. Guangxi Academy of Sciences, 98 Daling Road, Nanning 530007, China
4. DreamSciTech Consulting, Shenzhen 518054, China
5. Department of Technology and Nautical Sciences, Aalesund University College, 26025 Aalesund, Norway