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 “"Discrete representation"”.
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The discrete representation of spatially continuous images
Thesis (Ph.D.)--Massachusetts Institute of Technology, Dept. of Electrical Engineering and Computer Science, 1980.
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Computational simulation of buoyancy-driven flows using vortex methods
… is presented. This Lagrangian method utilizes a discrete representation of the known density field along with the vorticity transport equation and Boussinesq approximation to yield the baroclinically-generated vorticity field, also in a discrete form. The corresponding velocity field is then …
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A first approach to individual-based modeling of the bacterial conjugation dynamics
… model of bacterial conjugation using use a discrete representation of time and space. The space is defined by a discrete grid where agents are place and evolve through their local interactions. Each agent is described by a state vector updated according the model rules which takes into …
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Efficiency and abstraction in task and motion planning
… manipulation. The combination of continuous and discrete dynamics induced by contact creates severe computational challenges, and most known practical approaches rely on hand-designed discrete representations to mitigate computational issues. However, the relationship between the discrete …
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Computational design with curved creases : David Huffman's approach to paperfolding
… around the crease, providing an opportunity for discrete representation. More general curve types conclude the taxonomy. This structure allows me to present Huffman's varied oeuvre in a coherent way, raise questions for future research in geometry and describe Huffman's ways of designing with …
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Low-cost interrogation of optical fibre Bragg grating sensors
… the Bragg wavelength from a low resolution discrete representation of the reflected spectrum, and present optimal processing methods for providing a high integrity measurement from the reflection image. Our second sensing scheme uses a novel network of sensors to measure the distributive …
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Geometric Approaches in Phase Space Transport and Partial Control of Escaping Dynamics
… is required for avoiding escape and obtaining discrete representation called disturbance of continuous noise that is present in physical sciences and engineering. In the former scenario, along with avoiding escape, the control is constrained to be smaller than the disturbance so that it can not …
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Decision-aiding and optimization for vertical navigation of long-haul aircraft
… using a genetic algorithm (GA) operating on a discrete representation of the trajectory search space. The representation is a sequence of command altitudes, and was chosen to be compatible with the constraints imposed by Air Traffic Control, and with the training given to pilots.
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Finite sample properties of the maximum likelihood estimator in continuous time models
… euro area. The third chapter derives the exact discrete representation corresponding to a cointegrated system of mixed first- and second-order stochastic differential equations with mixed sampling and observable stochastic trends. We also provide some formulae to implement the Gaussian …
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Vector Distance Transform Maps for Autonomous Mobile Robot Navigation
… localization, and show that it is a superior representation compared to alternatives such as occupancy grid maps and other distance transform variants such as the unsigned distance transform and the signed distance transform. We propose an approach based on non-linear least squares …
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Efficient Robustness and Interpretability in Learning and Data-Driven Decision-Making
… the problem of learning the most concise discrete representation of a continuous state-space dynamic system. In the patient treatment setting, this corresponds to identifying treatment groups based on the evolving features of patients under treatment. Surprisingly, we prove theoretically …
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A Hybrid Discrete and Continuum Framework for Multiscale Modeling
… work that combines two simulation methodologies: discrete methods and continuum methods. Discrete methods model every single grain and are thus accurate; however, they scale poorly. By contrast, continuum methods can be faster by greatly reducing the degrees of freedom represented. However, they …
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Dynamic and structural basis of complex behaviour in a ciliated unicellular organism
… through the organism’s behaviours than such a discrete representation would suggest. Capturing the ciliary dynamics across all states, we map the entire spectrum of ciliary beating performed by a living microorganism. Despite the complexity present, we find that the behavioural space is low …
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A variational framework for multi-scale defect modeling in strained electronics and processing of composite materials
… element allowing for highly accurate and discrete representation of the interfacial physical phenomena. In addition, surface tension is incorporated into the formulation to discretely model jumps in the pressure field. The multi-phase interface is evolved employing a stabilized level-set …
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Selected optimization procedures for CFD-based shape design involving shock waves or computational noise
… interaction of the flow discontinuity with the discrete representation of the design problem may cause the objective function to be non-smooth. Methods for robust optimization of the nonsmooth functions are presented. The dissertation is divided into two parts, The first part investigates a …
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Formal approaches to security-aware robotic motion planning using hyperproperties
… as temporal logic specifications over a discrete representation of the given system. Despite the expressivity of conventional logic such as Linear Temporal Logic (LTL), Metric Temporal Logic (MTL), Signal Temporal logic (STL), etc., they cannot be used to formalize complex requirements …
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Reliability−based topology optimization frameworks for the design of structures subjected to random excitations
Embargo set by: Seth Robbins for item 95486 Lift date: 2018-11-10T18:43:22Z Reason: Author requested U of Illinois access only (OA after 2yrs) in Vireo ETD system