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Computer Engineering Commons

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All Computer Science and Engineering Research

2009

Articles 31 - 34 of 34

Full-Text Articles in Computer Engineering

Supercharged Planetlab Platform Architecture, Jonathan Turner, Patrick Crowley, John Dehart, Mart Haitjema, Fred Kuhns Kuhns, Ritun Patney, Michael Wilson, Charlie Wiseman, David Zar Jan 2009

Supercharged Planetlab Platform Architecture, Jonathan Turner, Patrick Crowley, John Dehart, Mart Haitjema, Fred Kuhns Kuhns, Ritun Patney, Michael Wilson, Charlie Wiseman, David Zar

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This report describes the Supercharged Planetlab Platform (SPP), a system designed as a prototype of an internet-scale overlay hosting platform. Overlay networks have become an important vehicle for delivering Internet applications. Overlay network nodes are typically implemented using general purpose servers or clusters. The SPP offers a more integrated architecture, combining general-purpose servers with high performance Network Processor (NP) subsystems. SPP nodes have recently been deployed as part of the Global Environment for Network Innovation (GENI) and are available for use by research users.


Robust Sensor Networks In Homes Via Reactive Channel Hopping, Mo Sha, Greg Hackmann, Chenyang Lu Jan 2009

Robust Sensor Networks In Homes Via Reactive Channel Hopping, Mo Sha, Greg Hackmann, Chenyang Lu

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Home area networks (HANs) consisting of wireless sensors have emerged as the enabling technology for important applications such as smart energy and assisted living. A key challenge faced in deploying robust wireless sensor networks (WSNs) for home automation applications is the need to provide long-term, reliable operation in the face of the varied sources of interference found in typical residential settings. To better understand the channel dynamics in these environments, we performed an in-depth empirical study of the performance of HANs in ten real-life apartments. Our empirical study leads to several key insights into designing robust HANs for residential environments. …


Efficient Tracking Of Many Objects In Structured Environments, Nathan Jacobs, Michael Dixon, Scott Satkin, Robert Pless Jan 2009

Efficient Tracking Of Many Objects In Structured Environments, Nathan Jacobs, Michael Dixon, Scott Satkin, Robert Pless

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We consider the special case of tracking objects in highly structured scenes. In the context of vehicle tracking in urban environments, we offer a fully automatic, end-to-end system that discovers and parametrizes the lanes along which vehicles drive, then uses just these pixels to simultaneously track dozens of objects. This system includes a novel active contour energy function used to parametrize the lanes of travel based only on the accumulation of spatio-temporal image derivatives, and a tracking algorithm that exploits longer temporal constraints made possible by our compact data representation; we believe both of these may be of independent interest. …


Reliable Patient Monitoring: A Clinical Study In A Step-Down Hospital Unit, Octav Chipara, Chenyang Lu, Thomas C. Bailey, Gruia-Catalin Roman Jan 2009

Reliable Patient Monitoring: A Clinical Study In A Step-Down Hospital Unit, Octav Chipara, Chenyang Lu, Thomas C. Bailey, Gruia-Catalin Roman

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This paper presents the design, deployment, and empirical study of a wireless clinical monitoring system that collects pulse and oxygen saturation readings from patients. The primary contribution of this paper is an in-depth clinical trial that assesses the feasibility of wireless sensor networks for patient monitoring in general (non-ICU) hospital units. The trial involved 32 patients monitored in a step-down cardiology unit at Barnes-Jewish Hospital, St. Louis. During a total of 31 days of monitoring, the network achieved high reliability (median 99.92%, range 95.21% - 100%). The overall reliability of the system was dominated by sensing reliability (median 80.55%, range …