1. Faculty of Electrical Engineering and Computer Science
2. Ningbo University
3. Ningbo
4. P. R. China
5. Guangdong Key Laboratory of Industrial Surfactant; Guangdong Research Institute of Petrochemical and Fine Chemical Engineering
6. Guangzhou 510665
7. P.R. China
8. State Key Laboratories of Transducer Technology
9. Shanghai Institute of Microsystem and Information Technology
10. Chinese Academy of Sciences
11. Shanghai 200050