本文给出三种启发式规则用于获取根集文档的质心向量。

In this paper, three heuristic rules were brought forward for obtaining a centroid vector corresponding to a root set.

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本文给出三种启发式规则用于获取根集文档的质心向量。

First, it advances the centroid feature vector of shot in order to reduce the storage of video database.

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本文从无阻尼系统出发，理论上分析了转子系统振动方程的特征根，特征向量所具有的特点。

In this paper, the properties of eigenvalues and eigenvectors of rotor systems are discussed. The derivation shows that eigenvalues are imaginary in non-damping systems, and eigenspaces are complete.

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