model constraint graph 模式约束图
Considering arranging train paths as arranging a periodic event, in virtue of the periodic constraint graph and the periodic tension model, the periodic train diagram network model is established.
将安排列车运行线的问题看作周期事件安排问题，并借助周期约束图及周期势差模型，可以建立周期运行图网络模型。
The reduction is carried out by using geometric constraint graph based on the point clusters. Then the sequence of reduction is computed and the geometric model is rebuilded.
该算法基于点簇对约束网络图进行归约，求得归约序列然后重构几何模型，具有求解速度快、可靠性高、应用范围广等优点。
In this paper, a method to build geometric constraint model of 2 dimensional drawing based on undirected graph is presented.
本文提出了一种基于图结构描述的二维图形几何约束模型的建立及存储方法。
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