Jerome E. Mitchell

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We show that oligonucleotides of CNG tracts readily adopt compact DNA structures that move unusually fast on gels. Base composition does not explain this, and non-CNG triplets (including GNC) do not form such structures. Chemical probing and melting experiments suggest that the structures probably are not hairpins. Although both long and short tracts can(More)
The Center for Remote Sensing of Ice Sheets has developed radars for NASA's Operation Ice Bridge field campaigns in order to map near-surface internal layers for estimating the accumulation rate. In snow and ice, internal layers are created by changes in the ambient conditions at the time of deposition, and represent contrasts in density, electrical(More)
The shift to parallel computing -- including multi-core computer architectures, cloud distributed computing, and generalpurpose GPU programming -- leads to fundamental changes in the design of software and systems. As a result, learning parallel, distributed, and cloud techniques in order to allow software to take advantage of the shift toward parallelism(More)
The Earth's rise in temperature can cause significant consequences and affect the subsurface dynamics of the Polar Regions. In an effort to investigate the stratigraphy and basal conditions in Greenland and Antarctica, the Center for Remote Sensing of Ice Sheets (CReSIS) has used instruments capable of recording the rapidly changing polar ice sheets. The(More)
SUMMARY Rangelands provide habitat for a wide array of plants and animals and forage for both domestic and wild herbivores. Estimating the cumulative area of rangeland in a country (Indicator 10) is complicated by how rangeland is defined and the scale at which range sites occur and are classified. Determining biomass production available for grazing(More)
The dynamic responses of the polar ice sheets in Greenland and Antarctica can have substantial impacts on sea level rise. Understanding the mass balance requires accurate assessments of the bedrock and surface layers, but identifying each layer is performed subjectively by time-consuming, dense hand selection. We have developed an approach for(More)
The near surface layer signatures in polar firn are preserved from the glaciological behaviors of past climate and are important to understanding the rapidly changing polar ice sheets. Identifying and tracing near surface internal layers in snow radar echograms can be used to produce high-resolution accumulation maps. This process is typically performed(More)
This work estimates surface and bedrock layers from radar imagery acquired in Antarctica. Identifying and accurately selecting the surface and bedrock provides ice sheet thickness measurements, which are important for the study of ice sheets, their volume, and how they may contribute to global climate change. The time-consuming, manual approach, however,(More)
— We present an analytical investigation of a performance monitoring scheme capable of simultaneously monitoring Chromatic Dispersion, Polarization Mode Dispersion and Optical Signal to Noise Ratio at 40Gbit/s on timescales that are appropriate to optical burst switched networks. This analysis supports previously published experimental results which showed(More)
In order to satisfy qualifying exam requirements adhered to by the School of Informatics and Computing, I will provide an overview of global optimization techniques, specifically simulated annealing, genetic algorithms, and tabu seach.