Global Security, Safety, and Sustainability : 7th International and 4th e-Democracy Joint Conferences, ICGS3/e-Democracy 2011, Thessaloniki, Greece, August 24-26, 2011, Revised Selected Papers - Christos K. Georgiadis, Hamid Jahankhani, Elias Pimenidis, Rabih Bashroush, Ameer Al-Nemrat ((Lecture Notes of the Institute for Computer Sciences, Social Informatics and Telecommunications Engineering))