1. State Key Laboratory of Electronic Thin films and Integrated Devices University of Electronic Science and Technology of China Chengdu 610054 P. R. China
2. School of Mechanical Engineering and Automation Fuzhou University Fuzhou 350108 P. R. China
3. Institute of Machine Intelligence (IMI) University of Shanghai for Science and Technology Shanghai 200093 P. R. China
4. Changchun Institute of Applied Chemistry Chinese Academy of Science Changchun Jilin 130022 P. R. China
5. Institute of Technical Aspects of Multimodal Systems (TAMS) Department of Informatics Universität Hamburg D-22527 Hamburg Germany