本文首先论述流通中心作为物流结点的一种在物流网络中的作用，并分析流通中心系统化的层次和结构。
The paper discuss Distribution center's function in the Logistics network first, and the analysis Distribution center's level of structure that systematize with the.
另外对规划结点的选择进行了研究，选择了与规划层次相对应的动态控制结点，而非现状结点。
Moreover, this paper also analyzes the choice of the planning node, adopting the development node and not present node.
考虑概念格中的不同“概念结点”的距离，获取查询扩展词汇，并结合产品层次，就给出了基于概念格的产品优先的查询扩展。
According to the distance between concept nodes in a concept lattice and the product hierarchies, we can get product-oriented query expansions.
通过层次的划分，将网络分成不同的域，将移动结点的切换限制在小范围内。
Through the hierarchy dividing, the network was divided into different domains and the switching of mobile nodes is confined in small scopes.
通过层次的划分，将网络分成不同的域，将移动结点的切换限制在小范围内。
Through the hierarchy dividing, the network was divided into different domains and the switching of mobile nodes is confined in small scopes.
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