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 17 of 17 for “"Topological constraints"”.
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Segmentation of medical images under topological constraints
… of image processing. To achieve accurate and topologically-correct delineations of anatomical structures from medical images is a critical step for many clinical and research applications. In this thesis, we extend the theoretical tools applicable to the segmentation of images under …
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Machine learning of image analysis with convolutional networks and topological constraints
We present an approach to solving computer vision problems in which the goal is to produce a high-dimensional, pixel-based interpretation of some aspect of the underlying structure of an image. Such tasks have traditionally been categorized as ''low-level vision'' problems, and examples include …
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Theoretical investigations of the role of excluded volume, topological constraints, and attractive forces in the slow dynamics of soft matter systems
… that describe such behavior: (i) excluded volume constraints and caging, (ii) topological or connectivity constraints, and (iii) attractive forces and physical bonding. The goal of this thesis is to develop microscopic force based theories to understand the slow dynamics of various soft matter …
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The effect of changing topological constraints on poleward ocean heat transport induced by plate tectonics over the last 600 million years
… in climate over the last 600 Ma. Different topological constraints on the oceans may affect their ability to transport heat poleward and change the equilibrium pole-equator temperature of Earth. An ocean model was run for three simple continental geometries to determine the effect of land …
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The Novikov theory for symplectic cohomology and exact Lagrangian embeddings
Given an exact symplectic manifold, can we find topological constraints to the existence of exact Lagrangian submanifolds? I developed an approach using symplectic cohomology which provides such conditions for exact Lagrangians inside cotangent bundles and inside ALE hyperkähler spaces. For …
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Theories of slow dynamics: from glassy colloidal suspensions to entangled macromolecular liquids
… relative importance of equilibrium structure and topological constraints on system dynamics, and theories studying each effect are constructed and applied in this dissertation. The first part of this thesis treats suspensions of hard-sphere colloids --- the theorist's idealization of a dense …
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(2+1)-dimensional gravity over a two-holed torus, T²#T²
… field theory to (2+1)-dimensional gravity over topologically non-trivial surfaces. Starting from the dreibe informalism, we reduce the Einstein action, a functional of geometric quantities, down to a functional only of the holonomies over flat compact surfaces, subject to topological …
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Directed-polymer systems explored via their quantum analogs
… emergent polymer fluid, and I shall examine how topological constraints on this polymer fluid (e.g., due to uncrossable pins or barriers) and their geometry give rise to strong, entropy-driven forces. I shall also apply quantum techniques such as Bethe's Ansatz and bosonization to shed light on …
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Divalent metal nanoparticles
… domains encircling or spiraling around the core. Topological constraints inherent in assembling two-dimensional vectors (e.g., ligands) onto a sphere (the core of the nanoparticle) dictate the necessary formation of two diametrically opposed defect points within the ligand shell. The molecules at …
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Protein structural dynamics and thermodynamics from advanced simulation techniques
… of an intermediate state in the folding path or topological constraints or large size, different from ideal systems, as may be considered small globular proteins that fold in a two state manner. The first treated topic is represented by the colicin immunity proteins IM9 and IM7, very similar in …
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Representations for intelligent navigation in unfamiliar environments
… images suitable for high-level planning with topological constraints.
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Growing synfire chains with triphasic spike-time-dependent plasticity
… either initial sparse connectivity or strong topological constraints in addition to any synaptic learning rules. Here, it is shown that this necessity can be removed. In this model, development is guided by an experimentally reported spike-timing-dependent plasticity (STDP) rule, triphasic …
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Spatial statistical-physical systems
… statistical physical models — Ising model under topological constraints and particle systems with anomalous behavior. Ising model is a mathematical model of ferromagnetism, which describes how magnetic spins, with values -1 or 1, change their states under nearest neighbor interactions and the …
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Management of spatial data for visualization on mobile devices
… data. Future work may extend this to integrate topological constraints and semantic constraints for enhancing the vector map visualization.
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Stability results for constrained dynamical systems
… to model and analyse dynamic systems with constraints. This framework facilitates modelling of the system behaviour through natural physical variables of the system, while preserving the topological constraints of the system. The main purpose of this dissertation is to investigate stability …
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Equilibrium Melting Temperature Determination of Semicrystalline Polymers through Nonlinear Hoffman-Weeks Extrapolation and Secondary Crystallization of Ethylene/Styrene Copolymers
… a second project, the effects of structural and topological constraints on the morphology, melting and crystallization behavior of ethylene/styrene copolymers are investigated. During cooling from the melt, the longest ethylene sequences crystallize into lamellae in the primary crystallization …
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Contribution of gene duplications to the evolution of genetic networks
… with a 1-to-1 stochiometry as well as certain topological constraints are requirements for such a behavior. This provides insight into what kind of regulatory circuits are robust to global effects like genomic duplications events, ploidy changes or global variations in the concentration of …