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 4461 for “"hierarchical"”.
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Hierarchical production planning.
Thesis. 1979. Ph.D.--Massachusetts Institute of Technology. Alfred P. Sloan School of Management.
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HIERARCHICAL-GRANULARITY HOLONIC MODELLING
… agent-based system engineering approach, named Hierarchical-Granularity Holonic Modelling, to support intelligent information processing at multiple granularity levels. The focus is especially on complex hierarchical systems. Nowadays, due to ever growing complexity of information systems and …
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Parallel hierarchical global illumination
<p>Solving the global illumination problem is equivalent to determining the intensity of every wavelength of light in all directions at every point in a given scene. The complexity of the problem has led researchers to use approximation methods for solving the problem on serial computers. Rather …
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Scalable hierarchical evolution strategies
Hierarchical reinforcement learning (HRL) has been steadily growing in popularity for solving the hardest reinforcement learning problems. However, current HRL algorithms are relatively slow and brittle to hyperparameter changes. This paper offers a solution to these slow and brittle HRL …
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Hierarchical Bayesian Dataset Selection
… first dataset selection algorithm that utilizes hierarchical Bayesian modeling, designed for collaborative data-sharing ecosystems. The proposed method efficiently decomposes the contributions of dataset groups and individual datasets to local model performance using Bayesian updates with small …
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Biomechanics of Hierarchical Elastic Systems
… by investigating elastic systems at three hierarchical levels of organization: a single structure, multiple connected structures, and a spring system connected to muscle. By using a multi-level approach, my aim is to demonstrate, at each of the mentioned levels, how properties of the spring …
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Enhancements to Hierarchical Pathfinding Algorithms
<p>In this thesis we study the problem of pathfinding in static grid-based maps. We apply the approach of abstraction and refinement. We abstract the grid map into a graph representation, and use the classic A* algorithm to search for a path in the abstract space, and then refine it into low-level …
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Textured Hierarchical Precomputed Radiance Transfer
… lower cost. In addition, this thesis introduces Hierarchical PRT, which extends some surface effects, such as soft shadows, between objects. Previous approaches to PRT used a more complex neighborhood transfer scheme in order to extend these lighting effects. Hierarchical PRT attempts to capture …
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HIERARCHICAL PREFERENCES AND CONSUMER CHOICE.
This study considers the problem of the consumer in light of work presented by classical economists who discussed consumption. Richer assumptions about the tasks of an individual consumer and technology of consumption activities are used to develop a static model of consumer behavior. This model is …
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Learning based hierarchical load balancer
Submission published under a 24 month embargo labeled 'Closed Access', the embargo will last until 2024-05-01
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Boiling on hierarchical nanoengineered surfaces
… Here, we developed a highly scalable, three-tier hierarchical surface deposition technique to investigate the pool boiling heat transfer performance with focus on the bubble departure diameter and frequency. Ultrahigh critical heat fluxes (CHF) greater than 400 W/cm2 were obtained, corresponding …
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Hierarchical Inference in Gaussian Processes
Hierarchical modelling is a fundamental theme in probabilistic machine learning which relies on the Bayesian interpretation on probability. The starting requirement for these models is that all unknowns are treated as random variables with their own respective probability distributions. The central …
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Perceptual refinement for hierarchical radiosity
… system to yield a performance improvement with hierarchical radiosity. Hierarchical radiosity is a physically based rendering algorithm and hence makes no attempt to optimize computation for human perception. We used a model of the edge enhancement properties of the human visual system to …
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Hierarchical reasoning in the brain
… in brain sciences. In this thesis, I address hierarchical reasoning at three levels of behavior, neural circuit, and computational models. First, I developed behavioral experiments to examine the reasoning behavior in dynamic environments with two hierarchical sources of uncertainty. The …
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Hybrid And Hierarchical Image Registration Techniques
… registers images with sub-pixel accuracy. A hierarchical iterative searching further enhances the convergence range and rate. The simulation results demonstrated that the proposed techniques provide significant benefits to the performance of image registration.
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Hierarchical modelling of multivariate survival data
Hierarchical models based on conditional independence are investigated as a means of modelling multivariate survival times. The model structure follows Clayton (1978), Hougaard (1986b), and Oakes (1986, 1989). Both approximate Bayesian and maximum likelihood estimation in these models is …
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Hierarchical control of complex manufacturing processes
… statically related to the states of the systems. Hierarchical Optimal Control was proposed to simplify the nonlinearity caused by adding the statically related objectives into control problem. The proposed method was implemented for contour-position control of motion systems as well as …
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Treemaps: Visualizing Hierarchical and Categorical Data
… are a graphical method for the visualization of hierarchical and categorical data sets. Treemap presentations of data shift mental workload from the cognitive to the perceptual systems, taking advantage of the human visual processing system to increase the bandwidth of the human-computer …
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