CR [1] is a promising solution to the problem of spectrum scarcity in wireless communications. The basic idea of CR is to allow secondary (unlicensed) users (SUs) to opportunistically utilize the spectrum of PUs (licensed), provided that the

这是对6—PUS并联机器人的运动学仿真及运动轨迹跟踪-This is the kinematics simulation and trajectory tracking of the 6-PUS parallel manipulato

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