User authentication plays very role in computing system.In this thesis,firstly we studied Smart Card and user authentica......

The traditional authentication system is based on the secret key, and is mainly based on public key infrastructure (PKI)......

Iris recognition, as a biometric method, outperforms others because of its high accuracy. Iris is the visible internal o......

为探究吕家坨井田地质构造格局,根据钻孔勘探资料,采用分形理论和趋势面分析方法,研究了井田7......