By utilizing redirect mechanism,it gradually gathers the nodes information at the same sub-network,and takes these node as its neighbors,thus it dramatically reduces the average searching path length,and does not introduce more traffic into the network.

The algorithm first finds neighbor and computes similarity,building neighbor matrix.

As a macroscopical check on modern society and social science, the notion of neighbor has emerged.

Several Deduced Definitions of Adjacency Matrix;

In recent years,Rail Transit lines in Shanghai have been built in dense forma- tion with mutual crossing one another for two networks or more,thence the problem of protective measures for running section already in operation impacted by the pit excavation of adjacent operational metro lines has been placed on agenda.

Firstly, proposes the two-levels order case representation, and constructs case similarity calculation model using nearest neighbour technique; then, according to order characteristics dedicated to steel industry, analyzes.