7Th Ieee International Conference on Distributed Computing in Sensor Systems, Dcoss'11, Date: 27 June 2011 through 29 June 2011, Location: Barcelona, Patrocinadores: IEEE Comput. Soc. Tech. Comm. Parallel Process. (TCPP);IEEE Comput. Soc. Tech. Comm. Distrib. Process. (TCDP)