Allocating Defense and Recovery Resources for Spatial Networks against Cascading Failures

Figure 9

Illustrations of hierarchical recovery strategies with a simple network. The gray nodes refer to the functional nodes before recovery, belonging to 1-layer; the purple nodes connected to the 1-layer nodes belong to 2-layer; and the blue nodes connected to the 2-layer nodes belong to 3-layer. The gray, purple, and blue links belong to different layers, while the red ones are unrepaired links. (a) HR mode. (b) HSR mode.

(a)

(b)