Testbeds and Research Infrastructures, Development of Networks and Communities : 6th International ICST Conference, TridentCom 2010, Berlin, Germany, May 18-20, 2010, Revised Selected Papers - Thomas Magedanz, Anastasius Gavras, Nguyen Huu Thanh, Jeffry S. Chase ((Lecture Notes of the Institute for Computer Sciences, Social Informatics and Telecommunications Engineering))