Data extrapolation in social sensing for disaster response
Gu, Siyu
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https://hdl.handle.net/2142/49761
Description
Title
Data extrapolation in social sensing for disaster response
Author(s)
Gu, Siyu
Issue Date
2014-05-30T17:08:18Z
Director of Research (if dissertation) or Advisor (if thesis)
Abdelzaher, Tarek F.
Department of Study
Computer Science
Discipline
Computer Science
Degree Granting Institution
University of Illinois at Urbana-Champaign
Degree Name
M.S.
Degree Level
Thesis
Keyword(s)
Social Sensing
Disaster Response
Data Extrapolation
Abstract
"This thesis complements the large body of social sensing literature by developing means for augmenting sensing data with inference results that ""fill-in"" missing pieces. Unlike trend-extrapolation methods, we focus on prediction in disaster scenarios where disruptive trend changes occur. A set of prediction heuristics (and a standard trend extrapolation algorithm) are compared that use either predominantly-spatial or predominantly-temporal correlations for data extrapolation purposes. The evaluation shows that none of them do well consistently. This is because monitored system state, in the aftermath of disasters, alternates between periods of relative calm and periods of disruptive change (e.g., aftershocks). A good prediction algorithm, therefore, needs to intelligently combine time-based data extrapolation during periods of calm, and spatial data extrapolation during periods of change. The thesis develops such an algorithm. The algorithm is tested using data collected during the New York City crisis in the aftermath of Hurricane Sandy in November 2012. Results show that consistently good predictions are achieved. The work is unique in addressing the bi-modal nature of damage propagation in complex systems subjected to stress, and offers a simple solution to the problem."
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