Computational Science and Its Applications – ICCSA 2012 12th International Conference, Salvador de Bahia, Brazil, June 18-21, 2012, Proceedings, Part IV - Murgante, Beniamino; Gervasi, Osvaldo; Misra, Sanjay; Nedjah, Nadia; Rocha, Ana Maria A. C.; Taniar, David; Apduhan, Bernady O. (Springer Berlin Heidelberg, 2012)