Although the matrix completion paradigm provides an appealing solution to the collaborative filtering problem in recommendation systems, some major issues, such as data sparsity and cold-startâ€¦ (More)

Out-of-treatment drug users are hard to reach. Outreach using indigenous outreach workers introduces appropriate and targeted interventions in an effort to slow the spread of HIV within drug-usingâ€¦ (More)

Let G be a simple, connected graph on n vertices. Let dG(u, v) denote the distance between vertices u and v in G. A subgraph H of G is isometric if dH(u, v) = dG(u, v) for every u, v âˆˆ V (H). We sayâ€¦ (More)

The analysis of social networks has attracted much attention in recent years. Link prediction is an important aspect of social network analysis and an area of key research within that is the networkâ€¦ (More)

Let G be a simple, connected graph on n vertices. LetdG(u, v) denote the distance between vertices u andv in G. A subgraphH of G is isometric if dH(u, v) = dG(u, v) for everyu, v âˆˆ V (H). We say thatâ€¦ (More)

Although recommendation systems based on the latent factor models provide an appealing solution to the collaborative filtering problem, some major issues such as data sparsity and cold-startâ€¦ (More)