An illustrative example for the SNAD model. This figure illustrates the workflow of the SNAD model. First, a bipartite graph of user-subject accesses is constructed (part a), which is subsequently represented as a binary matrix (part b). This matrix is then transformed using "inverse document frequency" (part c), from which the similarities between pairs of users are computed (part d) and from which a local access network associated with a subject s3 is built(part e). The similarities of the local access network and its five subnetworks are calculated (part f) and finally, the scores for each access associated with subject s3 are assessed.