Digital Eco-Systems : Third International Conference, OPAALS 2010, Aracujú, Sergipe, Brazil, March 22-23, 2010, Revised Selected Papers - Fernando Antonio Basile Colugnati, Lia Carrari Rodrigues Lopes, Saulo Faria Almeida Barretto ((Lecture Notes of the Institute for Computer Sciences, Social Informatics and Telecommunications Engineering))