Seminars & Colloquia

Klara Nahrstedt

University of Illinois at Urbana-Champaign

"Characterizing and Leveraging People Movement "

Tuesday February 21, 2012 11:00 AM
Location: 3211, EBII NCSU Centennial Campus
(Visitor parking instructions)

This talk is part of the System Research Seminar series



Collecting real human movements has drawn significant attention from research community. The reasons are multiple, including new insights in network protocol design, network management within urban planning, and environmental impact. However, obtaining comprehensive trace of people movement with integrated context information about location, contacts and stay duration has been missing and it proves to be a hard task.

In this talk we present a novel framework, which includes two major components: the UIM (University of Illinois Movement) sensing component and the Joytish context-analysis component. This framework includes (a) scanning process of joint location information (via WiFi scanner) and ad hoc contacts (via Bluetooth scanner) of human movement at the University of Illinois campus using Google Android phones, and (b) trace analysis algorithm of joint Bluetooth/WiFi information with its context inference towards characterization of people mobility patterns. This framework then enables us to deploy an efficient data dissemination protocol which uses both WiFi access point and ad hoc Bluetooth contact information to expedite the data forwarding. Our results show that we can characterize the detailed regularity of people movement, the visit duration of people at certain locations, and the popularity of locations. The evaluation of our dissemination protocol shows strong improvement of data forwarding delays when compared with other state-of-the-art protocols.

We will conclude the talk with a short discussion of challenges when it comes to mobility patterns of different user groups and of needs for characterizing and understanding people movement patterns in different scenarios if we aim to deploy effective protocols and services on future mobile hand-held devices.


Short Bio:

Klara Nahrstedt is a full professor at the University of Illinois at Urbana-Champaign, Computer Science Department. Her research interests are directed toward multimedia mobile systems, quality of service (QoS) management in mobile networks, QoS-aware resource management, 3D tele-immersive systems and networks, and real-time security in mission-critical systems. She is the co-author of widely used multimedia books `Multimedia: Computing, Communications and Applications' published by Prentice Hall, and "Multimedia Systems" published by Springer Verlag. She is the recipient of the IEEE Communication Society Leonard Abraham Award for Research Achievements, Ralph and Catherine Fisher Professor chair, University Scholar, Humboldt Fellow, Chair of SIG Multimedia. She was the general chair of ACM Multimedia 2006, general chair of ACM NOSSDAV 2007 and the general chair of IEEE Percom 2009.  

Klara Nahrstedt received her Diploma in Mathematics from Humboldt University, Berlin, Germany in numerical analysis in 1985. In 1995 she received her PhD from the University of Pennsylvania in the Department of Computer and Information Science. She is the member of ACM and IEEE Fellow.

Host: Xiaohui Helen Gu, Computer Science

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