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The impact on battery life has become a key design criteria for mobile device applications (apps). Poor user perceptions about an app's energy use can now quickly lead to negative social media reviews and the resulting adverse impact son the app's marketability. Traditionally, assessments of anapp's energy use have been done by simply measuring the total current draw experienced by the device while...
Theoretical models of ultrawideband (UWB) radio channels indicate that pairs of UWB radio transceivers measure their common radio channel with a high degree of agreement and third parties are not be able to accurately estimate the state of the common channels. These properties allow generation of secret keys to support secure communications from UWB channels measurements. In this paper, the results...
Developing a capacity to test distributed systems hinges on being able to generate the workloads that these systems are to process. Appropriate tools must not only generate these workloads in real-time, but must also be able to sweep through a range of possible workload characteristics to support sensitivity and robustness analyses. Currently, the majority of prior work in this area, including Harpoon,...
This position paper outlines the need and rational for developing large-scale emulation facilities structured to allow the scientific method tenets to be met on a per experiment basis. The work specifically focuses on the need to develop emulation-based test beds on the 1000+ machine scale, as expressed within the U.S. Defense Advanced Research Program Agency's (DARPA) BAA-08-43 Broad Agency Announcement...
This paper aims to give an empirical evaluation and analysis on ultra-wideband (UWB) channel properties, which differ quite significantly from their narrowband counterpart. Time domain measurements are performed to investigate the property of channel reciprocity, spatial correlation and body shadow effect. First of all, UWB reciprocity is observed under both baseband and radio frequency (RF) transmission,...
Secure communications in UWB based on cryptographic keys generated from channel measurements without a trusted third party have been developed. The fine time resolution of UWB allows high levels of mutual information to be obtained by a given A and B through independent characterizations of their shared communication channel. This mutual information determines the maximum secret key rate available...
In this article, we describe how to construct a large scale simulation system using the standard message passing interface (MPI) framework which can effectively explore the simulated players' strategy search spaces (i.e., to identify "good" strategies within particular "games" out of large sets of potential strategies) using genetic algorithms. We demonstrate how to create "intelligent"...
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