准确路径识别模型是指依据图的支撑树理论，添加标识站，把环形路网结构变为树状结构的模型。

In accordance with the prop tree diagram theory, adding the marking stations, the path-marking model in accurate way changes he annular structure speedway network into the tree structure.

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组播树特征伸长度模型通过寻找路径伸长度密集分布区域来评价组播路径的优化程度。

By looking for the areas where stretch values are dense, the stretch eigen-value model judges optimization degree of multicast paths.

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但是现有的层次网络模型和最优路径算法难以扩展到时变、随机网路中，为此本文提出了网络树模型和最优路径算法。

But it is difficulty to expand the existing hierarchical network models and algorithms for finding optimal path problems in the stochastic and time-dependent network.

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