1. School of Computer Science, Shaanxi Normal University, Xining, Qinghai, China
2. School of Computer, Qinghai Normal University, Xining, Qinghai, China
3. The State Key Laboratory of Tibetan Intelligent Information Processing and Application, Xining, Qinghai, China
4. Xining Urban Vocational & Technical College, Xining, Qinghai, China
5. Qinghai Provincial Radio and Television Bureau, Xining, Qinghai, China