其次研究了非连续频谱感知策略的优化设计问题，即在满足感知开销限制的条件下，如何最小化空闲频谱发现时间。

Secondly, the optimal design of discontinuous spectrum sensing scheme was studied, which aimed at minimizing the spectrum opportunities discovery time while satisfying the sensing overhead constraint.

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传统的材料表面处理、清洗方法已难以满足设计要求，同时由于污染问题和成本昂贵使用受到限制。

The classical ways of surface cleaning and preprocessing can hardly content these demand, and at the same time, their pollution and cost make them more unsuitable.

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