Dealing with Pure New User Cold-Start Problem in Recommendation System Based on Linked Open Data and Social Network Features

Algorithm 1

Similarity computation based on ontology.

	Input: Item Ontology O (C, At, R), Set of Items I
	Output: Semantic Similarity Matrix, SSM (I, I)
	for each Ii ϵ I
	for each Ij ϵ I
	if (!isEqual (Ii·SC, Ij·SC))
	Sontology (Ii, Ij) =
	else
	Sontology (Ii, Ij) =
	end if
	end for
	end for