Figure 6

The detection of driver nodes in a directed network. The simple directed network in A) can be converted to the bipartite network in B) and D). The links in red in B) and D) are two different maximum matching in the bipartite network, and the green nodes are the matched nodes. Mapping the bipartite network B) and D) back into the directed network, two different minimum sets of driver nodes are obtained, i.e., the sets of white nodes respectively shown in C) and E).