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 17 of 17 for “"reparameterization"”.
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The Ph(t)/Ph(t)/s/c Queueing Model and Approximation
… queueing model. This model can be thought as a reparameterization to the G(t)/GI(t)/s. Our approach is to partition the state space into known and identifiable structures, such as the M(t)/M(t)/s/c or M(t)/M(t)/1 queueing models. We then use the Polya-Eggenberger distribution to approximate …
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Molecular modeling of water and aqueous electrolytes under electric field: thermal, dielectric, and transport properties
… the TIP4P water model, a machine learning-guided reparameterization has been developed which shows better concordance with experimental dielectric and thermal properties of water. Using this model, the electro-thermal behavior of water under external electric fields has been investigated. A …
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Macroeconomic Forecasting: Statistically Adequate, Temporal Principal Components
… viewed as a statistical model derived from the reparameterization of the Multivariate Normal model in Spanos (1986). To motivate a PCA forecasting framework prioritizing sound model assumptions, it is demonstrated, through simulation experiments, that model mis-specification erodes reliability …
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Ensemble-based reservoir history matching using hyper-reduced-order models
… with the model dimension. To resolve the issues, reparameterization is adopted to reduce the order of the geological parameters. For the reparameterization, principal component analysis (PCA) is used to compute the reduced space of the model parameters, and by constraining the filtering analysis …
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Fast and stable smoothing spline analysis of variance models for large samples with applications to electroencephalography data analysis
… In particular, I propose (a) an efficient reparameterization of the smoothing parameters in SSANOVA models, (b) using strategically-selected knot grids instead of randomly selected knots, (c) including rounding parameters in the model, and (d) scalable algorithms for multiple-smoothing …
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Nutritional and genetic characterization of dairy cows managed on pasture-based systems, identifying key aspects to improve their performance
… matter fecal excretion were improved after model reparameterization, while body weight and body condition score predictions were improved after model modifications and reparameterization. Although digestion of nutrient was better represented by the new set of parameters derived, the accuracies of …
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Algorithms & Systems for Differentiable Graphics Programming
… compiler passes, and (ii) the warped-area reparameterization method that can be used to handle discontinuities by entirely removing the requirement of such problem-specific boundary samplers. We show how this enables light-weight integration with existing renderers by reparameterizing a …
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Methods for Generalization Under Distribution Shift
… an out-of-combination problem via a transductive reparameterization, which is possible under low-rank style conditions. We explore how this idea can be applied to domains like robotics, where the environment is changing, and materials and molecular design, where predicting properties of materials …
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Diameter Distributions of Juvenile Stands of Loblolly Pine (Pinus taeda L.) with Different Planting Densities
… distributions for juvenile loblolly pine. A reparameterization of the two-parameter Weibull distribution was sought to reduce the dispersion of the estimated shape parameter. Methods that quantify the amount of inter-tree spatial dependency in a particular stand were applied. Empirical …
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Reproductive biology and comparative growth rates of selected species of freshwater mussels (Bivalvia: Unionidae) in the New and Greenbrier Rivers, Virginia and West Virginia
… Growth rate, described by the parameter w from a reparameterization of the von Bertalanffy growth equation, was significantly higher immediately below Bluestone Dam compared to the site furthest downstream. Growth of this species did not differ significantly among the other sites; however, a trend …
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Continuous reservoir model updating by ensemble Kalman filter on Grid computing architectures
… as effectively as more complex and expensive reparameterization methods.
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Development Of New Algorithms For Exploring The Potential Energy Landscape Of Chemical Reactions
… while using constraints, fictitious forces or reparameterization schemes to maintain the distribution of points along the path. In the VRC method, a functional representing the energy of the entire reaction is minimized by varying the expansion coefficients of a continuous function used to …
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Theoretical and Applied Essays on the Instrumental Variable Method
… Instrumental Variable model can be derived by reparameterization of a well-specified statistical model defined on the joint distribution of the involved random variables as the actual (local) data generation process. This reveals the covariance structure of the error terms of the usual …
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Stomatal sensitivity to photosynthetic and environmental signals in glycine max grown at elevated atmospheric concentrations of CO2 and O3
… highest growth [O3] of 120ppb and ambient [CO2]. Reparameterization of large-scale models will be necessary to account for this change in stomatal function under these conditions. A strong, negative correlation between Vcmax and m was present whenever m was significantly altered. Estimation of m …
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Unsupervised anomaly detection for the ATLAS Level-1 Trigger
… modification to the variational autoencoder's reparameterization trick tailored for anomaly detection. The models were tested on a dataset containing a mix-ture of simulated Standard Model particle content and postulated, but still unobserved, particle content. Experimental results reveal …
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Designing and Fabricating 3D Nanostructures through Directed Self-Assembly of Block Copolymers
… studied to provide theoretical background of the reparameterization. This reparametrized DPD simulation serves as the tool to investigate how to fabricate novel 3D nanostructures. A novel approach to fabricate 3D nanostructure, named self-directed self-assembly (SDSA) of block copolymer, is then …
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T-spline Merging
Geometric models, such as for use in CAD/CAM or animation, are often constructed in a piece-wise fashion. Historically, these models have been made of NURBS surfaces. For various reasons it is problematic and often times mathematically impossible to combine several NURBS models into one continuous …