First it proved that the problem of link disjoint paths pair in the undirected graph without end to end QoS constraints counld be converted to the correspond problem in its link split graph,while the problem with end to end QoS constraints counld not be converted.

The existing LEO,MEO intersatellite links map at home and abroad is given by the representation method of pure graph.

In this paper,a chain graphical model was developed to describe the causal effect of Jiangzhiling on four variables which measured antioxidant capacity and blood fat level.

Based on chain graph, we present an algorithm to aggregate the nodes in a Bayesian network.

The output of the algorithm is largest chain graph,which just orienting the statistical distinguishable edges,keep the indistinguishable edges undirected.

Study on relay link of repeater station;

Modeling and power analysis for uplink of laser communication between airplane and satellite;

How to Improve Load Sharing of Tianjin HSTP Link;