
344 Analyzing and Securing Social Networks
way, it is important to make sure that irrelevant concepts will not be associated and matched, and
that relevant concepts will not be discarded. With regard to the second problem, we would like to
construct ontology automatically. Here, we address these two problems together by proposing a new
method for the automatic construction of ontology.
We build on the foundational work discussed in Section 26.2.4 for ontology construction. Our
method constructs ontology automatically in bottom-up fashion. For this, we rst construct a hierar-
chy using some clustering algorithms. Recall that if documents are sim ...