Parallel and Distributed Processing and Applications [electronic resource] : 5th International Symposium, ISPA 2007 Niagara Falls, Canada, August 29-31, 2007 Proceedings / edited by Ivan Stojmenovic, Ruppa K. Thulasiram, Laurence T. Yang, Weijia Jia, Minyi Guo, Rodrigo Fernandes Mello.