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.
Results
Showing 1 to 20 of 100 for “"Global Model"”.
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Oceanic transports of heat and salt from a global model and data
A state estimate produced by ECCO-GODAE from a global one-degree model and data spanning the years 1992-2005 is analyzed in terms of transports of volume, temperature, and freshwater. The estimate is assessed to be sufficiently close to observations to merit analysis. The methods of analysis are …
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Biofuels & atmospheric chemistry: what can a global model tell us about our future decisions?
… has in a new chemistry-climate computer model, UKCA; the response of ozone turns out to depend on local chemical conditions. To evaluate the global model, I use data from the OP3 field campaign in Malaysia and compare it with output from the model chemical mechanism. The mechanism is able …
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An analysis of lightning and the limitations it imposes on a global model of thunderstorm electricity
… transient effects from lightning into a global thunderstorm electricity model. First, E, the electric field produced by a lightning return stroke, is analytically derived. Second, a determination is made of the model's ability to handle the quickly varying fields produced by lightning. In …
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Convective Transport of Tropical Marine Boundary Layer Species into the Upper Troposphere and Relation to Species Lifetime: In Situ Measurements and Global Model Simulation
… from the Whole Atmosphere Community Climate Model (WACCM) with artificial tracers with lifetimes similar to our observed trace gasses. The Community Atmosphere Model with chemistry (CAMchem) is also used. Modeled results fit well with results from measured trace gasses indicating that their …
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Crack Initiation Analysis in Residual Stress Zones with Finite Element Methods
… load envelope. Abaqus was used to generate models that iteratively advanced toward solving this problem using the compact tensile specimen geometry. The first model developed in this study is a two-dimensional fracture model which then led to the development of an improved three-dimensional …
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Federated Learning for Resource Constrained Devices
… data to be shared. Each client trains its own model and communicates relevant model information to a central server. The server aggregates this information according to some specified algorithm and sends the clients a global model; the clients then update their own private models with this …
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Improving federated learning performance with similarity guided feature extraction and pruning.
… distributed clients to collaboratively train a global model in a privacy-preserved manner without sharing their private data. Traditional centralised ML approaches require aggregating data from various sources into a single location. This poses substantial risks regarding data privacy, security …
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Experimental and theoretical analysis of boltless semi-rigid connectors
… upright. Finite Element techniques were used to model the behavior of a boltleS3 semirigid beam end connector. The work was carried out in four stages. An elastic global model was set up to investigate the overall deformation of a beam connector using absolute restraints to simulate the …
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Use of global datasets for downscaling soil moisture with the EMT+VS model
Satellite remote sensing and land-surface models provide coarse-resolution (9-40 km) soil moisture estimates, but various applications require fine-resolution (10-30 m) soil moisture patterns. The Equilibrium Moisture from Topography, Vegetation, and Soil (EMT+VS) model downscales soil moisture …
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Taxonomic and Seasonal Variation Among Extant Hyracoids Based on Dental Microwear Texture Analysis
… than do lower values. The results from the global model where all four species, wet and dry seasons, and an interaction between species and seasons are considered reveal no significant distinctions among these factors. However, quantifying the <em>Asfc</em> levels for <em>Procavia</em> and …
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Study of surface kinetics in PECVD chamber cleaning using remote plasma source
… cleaning process chamber; and to make a global model that predicts the partial pressure of active species in the cleaning chamber. The final goal is to set-up an optimal cleaning process using the results from the experiment and the global model. The first object is to characterize the …
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Breaking Privacy in Model-Heterogeneous Federated Learning
… to collaboratively train a machine learning model. In FL, data never leaves client devices; instead, clients only share locally computed gradients or model parameters with a central server. As individual gradients may leak information about a given client's dataset, secure aggregation was …
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Federated Learning With Generalization To New Domains
… that focuses on training machine learning models in a decentralized fashion without having the need to store all data on one central server. In this thesis, we address the challenges of data heterogeneity and label scarcity in FL by proposing two novel approaches for federated domain …
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Federated learning in drone-based systems
… station), where each drone generates a local model with its data and then shares the local model parameter updates with the server, which aggregates these to generate the global model. Operational and strategic constraints such as communication between drones and base station while the drones …
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Modeling the Sit-to-Stand Transition using Koopman Lifting Linearization and Human State Estimation
… thesis presents contributions to the dynamic modeling of STS and to human-robot collaboration for improving robotic assistance of STS. To coherently capture the multi-phase nature of STS, lifting linearization, a dynamic modeling methodology inspired by Koopman operator theory, to subsume …
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Testing Federated Learning Privacy Through Gradient Leakage Attacks
… way of collaboratively training machine learning models across multiple clients. FL training proceeds in communication rounds, in which each client receives a global model from the FL server and sends back parameter updates computed on its local data using stochastic gradient descent. When all …
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Exploring the absorption properties and direct radiative impact of atmospheric carbonaceous aerosols
… and very uncertain factors contributing to global climate change. In estimating the direct radiative effect (DRE), the absorption from carbonaceous aerosols, including black carbon (BC) and brown carbon (BrC, a component of organic aerosol, OA), are highly uncertain. This thesis addresses …
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A kinetic transport model of uranium molecular species formation in a laser ablated plasma plume
… former problem by developing a plasma-chemistry model of uranium molecular species formation during the early stages of nuclear fireball expansion. The model features a newly constructed U$_x$O$_y$ reaction mechanism that consists of 30 reaction channels for 11 uranium molecular species, …
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Social skills, personality, occupational interests, and job performance: A multivariate structural analysis
This paper proposes a conceptual model of job performance and describes a study that was designed to evaluate the model. The conceptual model specifies directional relations among proposed antecedents of job performance. The model hypothesized that personality traits and occupational interests …
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Optimal design of geodesically stiffened composite cylindrical shells
… is then presented. The method is based on a global/local analysis technique. It employs spline interpolation functions to determine displacements and rotations from a global model which are used as "boundary conditions" for the local model. The organization of the strategy in the context of …
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