Date : 13-02-12
[Seminar] Prof. Jussi Kangasharju of Helsinki
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Title: Floating Content: Opportunistic Information Sharing in Urban Areas

Speaker: Jussi Kangasharju (University of Helsinki)

Date: Feb 12th, (Tue) 17:00~18:30

Location: 우정관 (Woojung Building), 201 lecture room, Korea University

Jussi Kangasharju received his MSc from Helsinki University of Technology in 1998. He received his Diplome d'Etudes Approfondies (DEA) from the Ecole Superieure des Sciences Informatiques (ESSI) in Sophia Antipolis in 1998. In 2002 he received his PhD from University of Nice Sophia Antipolis/Institut Eurecom. In 2002 he joined Darmstadt University of Technology (TUD), first as post-doctoral researcher, and from 2004 onwards as assistant professor. In 2007 he successfully passed his 3-year evaluation for a contract extension at TUD. Since June 2007 Jussi is a professor at the department of computer science at University of Helsinki. Since January 2009 he is also the director of the Future Internet research program at Helsinki Institute for Information Technology (HIIT). Jussi's research interests are information-centric networks, content distribution, opportunistic networks, and green ICT. He is a member of IEEE and ACM.

Content sharing using personal web pages, blogs, or online social networks is a common means for people to maintain contact with their friends, colleagues, and acquaintances. While such means are essential to overcome distances, using infrastructure services for location-based services may not be desirable. In this talk, we present a fully distributed variant of an ephemeral content sharing service, solely dependent on the mobile devices in the vicinity using principles of opportunistic networking.

The net result is a best effort service for floating content in which: 1) information dissemination is geographically limited; 2) the lifetime and spreading of information depends on interested nodes being available; 3) content can only be created and distributed locally; and 4) content can only be added, but not explicitly deleted. We present our system design, summarize its analytical modeling, and perform extensive evaluation for a map-based mobility model in downtown Helsinki to assess the operational range for floating content. We also consider issues related to naming and present an API for floating content applications and its simple evaluation.