Faulkner, Matthew Nicholas (2014) Community sense and response systems. Dissertation (Ph.D.), California Institute of Technology. http://resolver.caltech.edu/CaltechTHESIS:04152014-111007328
The proliferation of smartphones and other internet-enabled, sensor-equipped consumer devices enables us to sense and act upon the physical environment in unprecedented ways. This thesis considers Community Sense-and-Response (CSR) systems, a new class of web application for acting on sensory data gathered from participants' personal smart devices. The thesis describes how rare events can be reliably detected using a decentralized anomaly detection architecture that performs client-side anomaly detection and server-side event detection. After analyzing this decentralized anomaly detection approach, the thesis describes how weak but spatially structured events can be detected, despite significant noise, when the events have a sparse representation in an alternative basis. Finally, the thesis describes how the statistical models needed for client-side anomaly detection may be learned efficiently, using limited space, via coresets.
The Caltech Community Seismic Network (CSN) is a prototypical example of a CSR system that harnesses accelerometers in volunteers' smartphones and consumer electronics. Using CSN, this thesis presents the systems and algorithmic techniques to design, build and evaluate a scalable network for real-time awareness of spatial phenomena such as dangerous earthquakes.
|Item Type:||Thesis (Dissertation (Ph.D.))|
|Subject Keywords:||Machine learning, smartphones, geospatial event detection, participatory sensing, sensor network|
|Degree Grantor:||California Institute of Technology|
|Division:||Engineering and Applied Science|
|Major Option:||Computer Science|
|Awards:||Demetriades - Tsafka - Kokkalis Prize in Seismo-Engineering, Prediction and Protection, 2011|
|Thesis Availability:||Public (worldwide access)|
|Defense Date:||1 May 2014|
|Default Usage Policy:||No commercial reproduction, distribution, display or performance rights in this work are provided.|
|Deposited By:||Matthew Faulkner|
|Deposited On:||12 Aug 2014 15:48|
|Last Modified:||13 Apr 2015 19:55|
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