此外，这些序列相关函数的下界改善，对于那些不能达到下界的具有零相关区的序列，给出了一种新的下界。

In addition, lower bounds on correlation function of such sequence set are improved, a new lower bound, for those ZCZ sequences which don't meet lower bound, is presented.

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在许多情况下，新的下界有所减少，它的选取简便有效。

The new lower bound will decrease, and its selection is easy and effective.

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考虑加权回归模型，定义了一种新的相对效率，并给出了相对效率的下界，同时讨论了新的相对效率与其它三种已有相对效率的关系。

For the linear weighted regression model, this paper defines a new relative efficiency, gives its lower bound and also discusses its relation to other three efficiencies.

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