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Date The final copy of this thesis has been examined by the signatories, and we find that both the content and the form meet acceptable presentation standards of scholarly work in the above mentioned discipline. Thesis directed by Professor James Curry The size of data sets found in practice often prevents standard information retrieval and machine learning(More)
This paper presents a massively parallel Ant Colony Optimization – Pattern Search (ACO-PS) algorithm with graphics hardware acceleration on nonlinear function optimization problems. The objective of this study is to determine the effectiveness of using Graphics Processing Units (GPU) as a hardware platform for ACO-PS. GPU, the common graphics hardware found(More)
Recently published data from a sample of Bogotá, Colombia public housing residents show that apartment dwellers, but not house dwellers, reduced their fertility in a tight housing market. We propose that the utility-cost theory of fertility accounts for this finding, and, using this theory, we predict that (a) apartment residents will not decrease their(More)
BACKGROUND Respiratory alarm monitoring and rapid response team alerts on hospital general floors are based on detection of simple numeric threshold breaches. Although some uncontrolled observation trials in select patient populations have been encouraging, randomized controlled trials suggest that this simplistic approach may not reduce the unexpected(More)
This paper presents a Particle Swarm - Pattern Search Optimization (PS<sup>2</sup>) algorithm with graphics hardware acceleration for bound constrained nonlinear optimization problems. The objective of this study is to determine the effectiveness of using Graphics Processing Units (GPU) as a hardware platform for Particle Swarm Optimization (PSO). GPU, the(More)
The effects of earthworms (Lumbricidae) on plant biomass production and N allocation in model intercropping systems of winter wheat and white clover were evaluated in two pot experiments. Wheat and wheat-clover mixtures were grown in a low-organic loam soil, earthworms were added at densities comparable to field population densities and the experiments were(More)
The earthworm population in a winter cereal field in Ireland was studied over a 3-year-period and its effects on soil and N turnover were assessed. The mean annual population density was 346–471 individuals m-2 and the mean biomass was 56.9–61.2 g m-2. Twelve species were recorded, the most abundant being Allolobophora chlorotica followed by Aporrectodea(More)