Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 20 of 33 for “"sampling efficiency"”.
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Characterizing bias, precision, and sampling efficiency of commonly used electrofishing sampling designs in midwestern lentic systems
Submission original under an indefinite embargo labeled 'Open Access'. The submission was exported from vireo on 2023-04-12 without embargo terms
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Robust Analog Circuit Parameter Optimization with Sampling-Efficient Reinforcement Learning
… temperature (PVT) variations or suffer from low sampling efficiency to train algorithms. To address these critical limitations, this thesis proposes RoSE, the first Robust analog circuit parameter optimization framework with high Sampling Efficience by synergistically combining Bayesian …
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An experimental investigation of dynamically reconfigurable computer network architectures through simulation
… reported by other researchers with regard to sampling efficiency (information derived per sample unit) when dynamic reconfigurability is precluded. The inherent non-stationarity induced by reconfiguration reveals the sensitivity of standardized time series and the consequent adjustment to …
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Differences in Fish Abundance Among Habitat Types in a Warmwater Stream; The James River, South Dakota
… 1989 and 1990. A total of 57 sites were sampled. Sampling efficiency was estimated for each habitat using rotenone and mark-recapture procedures. Correction factors, proportional to sampling efficiency, were used to minimize inherent sampling biases among habitats. Density (no./hectare) and …
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Evaluation of the theta pinch as a sampling and excitation source for elemental analysis of solid refractory materials
… were performed to assess its effectiveness as a sampling and excitation source for elemental analysis of refractory solids. Previous work demonstrated the ability of the discharge to produce spectra suitable for qualitative analysis, but quantitation could not be demonstrated due to insufficient …
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Accelerating Bayesian Computation in Earth Remote Sensing Problems
… within this low-dimensional subspace to increase sampling efficiency. For an example retrieval, reducing the parameter dimension by a factor of 4 increased the effective sample size of the MCMC chain by more than two orders of magnitude. This low-dimensional subspace was shown to be able to …
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Uncertainty Analysis of Biological Nonlinear Models Based on Bayesian Estimation
… this study, Bayesian estimation with rejection sampling has been extended to estimate the parameters of nonlinear models. This estimation method can estimate marginal distributions and correlation among all parameters of nonlinear models. A sampling algorithm, Conditional Independent Sampling, …
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Reliable Data Processing Enabled By Program Analysis
… errors, we propose techniques to improve the sampling efficiency of Monte Carlo methods, namely execution coalescing and white-box sampling. For internal errors, we develop efficient monitoring techniques to detect instability problems at runtime in floating point program executions.</p>
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Advances in MRI to probe the functional and structural network of the macaque brain
… white matter architecture which boosts the sampling efficiency of the diffusion MRI acquisition by 274-377%.
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Novel Approaches to Discovery and Optimization in Physics: Symbolic Regression, Bayesian Optimization, and Topological Photonics
… models and improve optimization in terms of both sampling efficiency and computational cost of training. Finally, I develop a framework for global optimization and automated discovery of 3D topological photonic crystals using a combination of a low-dimensional level-set parameterization and …
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Methods for functional brain imaging
… fMRI of auditory processes. First, the inefficiency of standard fMRI that acquires brain volumes one slice at a time is addressed. The proposed single-shot method is capable, for the first time, of imaging the entire brain in a single-acquisition while still maintaining adequate spatial …
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SPIRAL: Iterative Subgraph Expansion for Knowledge-Graph Based Retrieval-Augmented Generation
… while retrieving at most 50 triples—doubling the sampling efficiency of the strongest prior work. Coupled with Llama 3.1-8B, the retrieved trees boost Hit@1 by 2.5 % over SubgraphRAG. Ablation studies confirm that adaptive labels are critical for multi-hop reasoning. SPIRAL demonstrates that …
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American Eel Subpopulation Characteristics in the Potomac River Drainage, Virginia
… patterns. Inland data resulted from sampling in the Shenandoah River drainage and near-coastal data resulted from sampling tributaries to the lower Potomac River. Movement and growth were also investigated in inland areas. Eels from the Shenandoah River drainage were significantly …
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Investigations of freshwater surface microlayers: comparisons of methods for sampling various microlayer thicknesses with observations on select chemical and microbiological features of microlayers of three aquatic ecosystems relative to the bulk of subsurface water
… the comparison of four surface microlayer sampling devices. The objective of this comparison was to determine the relative sampling efficiencies, and depth of water collected by each sampler. The results showed that the plate and drum samplers were far superior to the screen and tray …
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Development and validation of standardized sampling protocols for assessing freshwater mussel populations in Missouri
… the effectiveness of metrics from visually-based sampling methods is an essential step in assessing populations. We surveyed 14 sites in the Meramec River Basin in East-central Missouri to determine the effectiveness of visual sampling methods and to determine the effects of habitat variability on …
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Evaluation of Economic Injury Levels and Chemical Control Recommendations for Rice Stink Bug (Oebalus Pugnax) in Louisiana
… management (IPM): insecticide recommendations, sampling efficiency, treatment thresholds, farmer practices, and improved educational tools. The first objective of this research was to compare the efficacies of currently used insecticides with that of a new product from the neonicotinoid class of …
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Status of Paddlefish in Lake Francis Case, South Dakota
… growth, mortality, stocking success, and sampling methodology) is lacking. The objectives of this study were to 1) determine the historic and current status of paddlefish in Lake Francis Case, and 2) evaluate sampling efficiency and methodology for paddlefish in Lake Francis Case. To …
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Transition path sampling in organometallic catalysis: Overcoming the rare event problem in ab initio molecular dynamics
… scale limitation by adapting Transition Path Sampling (TPS) for use in organometallic chemistry. TPS is a novel Monte Carlo technique to focus an MD simulation on a reactive event. We present new algorithms to generate initial reactive trajectories for TPS and a novel trajectory generation …
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Single-molecule detection of molecular beacons generated from LDR on thermoplastic microfluidic device for bioanalysis
… chip with tapered detection window to improve sampling efficiency. The detection could be completed in 15 min with extended readout time to glean low copy number transcripts.
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