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We investigate the problem of content adjustment in real time according to the usage of storage and spectrum resources in elastic optical datacenter networks. A novel resource-efficient content adjustment (RECA) scheme is proposed to minimize spectrum consumption, content synchronization cost, and blocking probability.
The ultrasonic waves in air have been applied to sound reproduction for audio applications. Due to nonlinear propagation characteristics of the ultrasonic waves, a directional audible sound can be generated through the emitted ultrasonic waves from the parametric ultrasonic transducer array. A wave ultrasonic airborne transducer was designed and fabricated by curving poly vinylidene fluoride (PVDF)...
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