Fengyan Sun

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Digital watermarks are signals embedded in multimedia data to allow copyright enforcement or to distinguish copies of the document and it's still a novel study area. While a public-key watermarking system allows two parties who have never met or exchanged a secret to send hidden messages over a public channel so that an adversary cannot even detect that(More)
A new visco-elastic contact model of traveling wave ultrasonic motor (TWUSM) is proposed. In this model, the rotor is assumed to be rigid body and the friction material on stator teeth surface to be visco-elastic body. Both load characteristics of TWUSM, such as rotation speed, torque and efficiency, and effects of interface parameters between stator and(More)
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