BEGIN:VCALENDAR
VERSION:2.0
PRODID:-//Talks.cam//talks.cam.ac.uk//
X-WR-CALNAME:Talks.cam
BEGIN:VEVENT
SUMMARY:Delivery Properties of Human Social Networks - Nishanth Sastry (Un
 iversity of Cambridge)
DTSTART:20090416T150000Z
DTEND:20090416T160000Z
UID:TALK17690@talks.cam.ac.uk
CONTACT:Eiko Yoneki
DESCRIPTION:The recently proposed Pocket Switched Network paradigm takes a
 dvantage of human social contacts to opportunistically create data paths o
 ver time. Our goal is to examine the effect of the human contact process o
 n data delivery. We find that the contact occurrence distribution is highl
 y uneven: contacts between a few node-pairs occur  too frequently\, leadin
 g to inadequate mixing in the network\, while the majority of contacts are
  rare\, and essential for connectivity. This distribution of contacts lead
 s to a significant variation in performance over short time windows. We di
 scover that the formation of a large clique core during the window is corr
 elated with the fraction of data delivered\, as well as the speed of deliv
 ery. We then show that the clustering co-efficient of the contact graph ov
 er a time window is a good predictor of performance during the window. Tak
 en together\, our findings suggest new directions for designing forwarding
  algorithms in ad-hoc or delay-tolerant networking schemes using humans as
  data mules.
LOCATION:FW26\, Computer Laboratory\, William Gates Builiding
END:VEVENT
END:VCALENDAR