The concept of proxy signature introduced by Mambo,Usuda,and Okamoto allows a designated person,called a proxy signer,to sign on behalf of an original signer in
Describes the structure of a current feedback ultrasonicgeneration system with such characteristic as velocity stabilization and automatic frequency tracking, d
For natural images with complex background and noise, this new approach appears is more effective than other techniques for three key reasons: 1)edge elements treated interdependently to overcome the