3) precise–precise
In terms of semantic similarity simpp(x1, x2) between
precise concept x1 and x2, the distance dist(x1, x2)
between x1 and x2 extended with rough ontology needs to
be considered. So, considering the semantic distance
dist(x1, x2) and the direction of edges, the distance
weights are given in TABLE .
TABLE I. EXPANDED SEMANTIC DISTANCE WEIGHTS
G S P Gr Sr
0 1 2 — —
G 1 2 3 1 3
S 2 3 3.5 3 4.5
P 3 3.5 6 4 4
Gr 1 3 3 — 5
Sr 4 5 4 5 —
In TABLE , is blank operation; G is generalization
operation including edges from child node to parent node,
and edges linked by precise rules from precise concept to