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.
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.
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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