Grid and Pervasive Computing Workshops : International Workshops, S3E, HWTS, Doctoral Colloquium, Held in Conjunction with GPC 2011, Oulu, Finland, May 11-13, 2011. Revised Selected Papers - Mika Rautiainen, Timo Korhonen, Edward Mutafungwa, Eila Ovaska, Artem Katasonov, Antti Evesti, Heikki Ailisto, Aaron Quigley, Jonna Häkkilä, Natasa Milic-Frayling, . Jukka Riekki ((Lecture Notes in Computer Science))