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Rick Han
Operating Systems (CSCI
3753)
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Associate Professor
Phone: (303) 492-0914 Campus Box 430 |
Research Interests and Projects:
The SocialFusion Project in Context-Aware Mobile Social NetworksSocialFusion is a project that brings together mobile computing and online social networks to create a new ecosystem that supports novel context-aware applications via mobile cloud computing. The project investigates leading-edge research issues such as privacy and anonymity issues in online social networks and mobile social networks, group-based recommendations and data mining in context-aware mobile social networks, and infrastructural services via mobile cloud computing.
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Safety and Privacy Issues in Online Video Chat Environments:Our SafeVchat paper was published at WWW 2011. The research associated with this work was mentioned in articles in the MIT Technology Review, New Scientist, CBC News, etc. Our SafeVchat software has been deployed on Chatroulette.com and has been successfully processing tens of thousands of video chat users at any given time to help filter misbehaving users.Our technical report, "Intrusions into Privacy in Video Chat Environments: Attacks and Countermeasures", has shown that video chat environments such as Chatroulette are susceptible to certain privacy attacks. In particular, we found that systems like Chatroulette are subject to enhanced de-anonymization attacks, phishing attacks, and man-in-the-middle attacks. Our research has been written up by IDG, and appeared in a New York Times article. There has also beena discussion topic on slashdot about our work. Our project Web site describes our ongoing research on this topic. |
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The "Holodeck" Project:
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| Our idea is
to actuate a physical array or grid of moving
pixels, which we call moxels,
using Graphics Processing Units, or
GPUs. We find that this GPU-based
solution is cost-effective and scalable, such
that large grids could be controlled to render
physical surfaces in a Holodeck-like
environment. Moreover, our GPU-based
approach allows us to leverage existing
graphics rendering software technology to
assist in the physical rendering.
However, non-trivial modifications need to be
made to the graphics rendering software. An early version of this work was published at the 1st Workshop on Cyber-Physical Systems (WCPS), "Towards Cyber-Physical Holodeck Systems Via Physically Rendered Environments (PRE’s)". The Beijing Olympics Opening Ceremony featured a version of our moxel technology on the grand scale (right top picture), but we admit that the moxels were human actuated instead of GPU actuated (right bottom picture). |
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The Mantis Project in Wireless Sensor Networks:
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Prior
Projects:Affiliations:
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