1. School of Microelectronics, Tianjin University, Tianjin 300100, China
2. China United Network Communication Group Co. Ltd., Beijing 100000, China
3. Nankai University, College of Software, Tianjin 300100, China
4. Inspur Software Co. Ltd., Beijing 100085, China
5. Education Foundation of Beijing Central University for Nationalities, Beijing 100000, China