ACM Author-ized publication (free access from here)
ACM DL Author-ize serviceGoal-oriented sensor selection for intelligent phones: (GOSSIP)
Veronika Koltunova, Jesse Hoey, Marek Grześ
SAGAware '11 Proceedings of the 2011 international workshop on Situation activity & goal awareness, 2011
The link above will give you free access to the article on the ACM Digital Library