[ACM Press Proceeding of the 11th annual international conference - Taipei, Taiwan (2013.06.25-2013.06.28)] Proceeding of the 11th annual international conference on Mobile systems, applications, and services - MobiSys '13 - Sensing device co-location through patterns of silenceTan, Wai-Tian; Baker, Mary; Lee, Bowon; Samadani, Ramin · 2013