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 20 of 39 for “"Underdetermined"”.
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Automated fixing of wrong assumptions on underdetermined specifications
… the same input. However, some specifications are underdetermined, meaning that the software may produce different outputs given the same input. Underdetermined specifications are not uncommon because they can offer some advantages over deterministic ones. For instance, underdetermined …
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Sparse Solutions to Structured Underdetermined Systems in the Presence of Small Noise
In addition, we provide an upper bound on the magnitude of the small noise to guarantee the correct determination of the number of nonzero entries of our unknown sparse vector, as well as an upper bound on the magnitude of the small noise to guarantee the correct localization of these nonzero …
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Learning a Complex Language From Simple Input: Contributions of Phrase Bracketing Information
… Yet, the rules which children induce are underdetermined by their language data. Moreover, children are not exposed to representative samples of their languages; rather, sentences addressed to children tend to be short and syntactically simple. Nevertheless, children exposed to different …
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The Sherman Morrison Iteration
… to be effective when dealing with an extremely underdetermined least squares problem. The performance of the Sherman Morrison iteration is compared to classic direct methods, as well as iterative methods, in a number of experiments. Specific Matlab implementation of the Sherman Morrison …
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Extracting Ramachandran torsional angle distributions from 2D NMR data using Tikhonov regularization /
… recoupling (CTDQFD) data. This is a vastly underdetermined problem, and the stability of the inverse mapping is problematic. Tikhonov regularization is a well-known method of improving the stability of the inverse; in this work it is extended to use a new regularization functional based on …
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The Reconstruction of Binary Images in Discrete Tomography by Using the Binary Steering Scheme
… projections methods for solving an underdetermined linear system Ax = b. Three algorithms: Algebraic Reconstruction Technique (ART) Algorithm, Cimmino's Algorithm (CIM) with Equal Weights Algorithm and Fully-Simultaneous Diagonally-Relaxed Orthogonal Projections (DROP) Algorithm are …
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Source Separation using Sparse Bayesian Learning
… order to approach such problems involving highly underdetermined linear systems, we propose utilizing Sparse Bayesian Learning and present our results on selected problems.
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Control allocation for the next generation of entry vehicles
… solution when the system of linear equations is underdetermined. A multivariable control law is adopted to drive the control allocation algorithm and to track the desired state of the entry vehicle model. Open loop and closed loop tests are conducted to demonstrate dynamic objective calculation, …
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Setting location priors using beamforming improves model comparison in MEG-DCM
… of the active neural sources, which leads to an underdetermined system and increased complexity in estimating the network parameters. This work shows that inform- ing the MEG DCM source location with prior distributions defined using a MEG source localization algorithm improves model selection …
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Voluntary Action and Conscious Intention
… making decisions and acting in a manner that is underdetermined by the external environment. Investigations of the neuronal basis of volition have led to new controversies regarding the existence of free will, and offer potential directions for medical treatments of disorders such as addiction, …
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Wireless Sensing with Machine Learning: Through-Wall Vision & Contactless Health Monitoring
… the environment in complex ways, resulting in an underdetermined mapping that varies across time and space. To address this problem, this dissertation adopts a data-driven approach and develops custom machine learning models that operate on radio signals. Developing such models requires technical …
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Stable Sparse Orthogonal Factorization of Ill-Conditioned Banded Matrices for Parallel Computing
… solver that breaks it down into small-scale underdetermined systems, which are solved by the proposed factorization with high accuracy. We also implement a parallel solver with strategies to treat the memory issue appearing in extra large-scale linear systems of size over one billion. …
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A compressed sensing approach to block-iterative equalization: connections and applications to radar imaging reconstruction
The widespread of underdetermined systems has brought forth a variety of new algorithmic solutions, which capitalize on the Compressed Sensing (CS) of sparse data. While well known greedy or iterative threshold type of CS recursions take the form of an adaptive filter followed by a proximal …
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Acquisition and reconstruction techniques for improving rapid magnetic resonance imaging with applications in fetal imaging
… image acquisition model and solve the resulting underdetermined system of equations using prior knowledge. We verify the efficacy of the techniques both in simulation and invivo adult brain experiments. Finally, we discuss how our proof of concent technique and results can be translated to the …
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Processes of Social Change in the Works of Badiou and Laclau
… the present to an extent that is theoretically underdetermined, resulting in the blurring of the distinction between social transformation and social reproduction. The final part of this thesis explores the possibility of bringing together the Laclauian notion of the ‘simplification’ of the …
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An iterative, residual-based approach to unsupervised musical source separation in single-channel mixtures
… entities from a single one is an extremely underdetermined task, so additional prior information can assist in setting appropriate constraints on the solution set. The approach proposed uses prior information such that: (1) it can potentially be applied successfully to a large variety of …
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Conditioned by History: Experience and Critique in Foucault's Thought
… as a historically immanent, yet necessarily underdetermined, norm. This account of historical conditions avoids the facile opposition between determinism and freedom, by showing that the historical a priori neither determines the individual’s action, nor is it rendered inoperative by the …
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Multi-electrode stimulation and measurement patterns versus prior information of fast 3D EIT
… the resulted discrete system is heavily underdetermined and ill-conditioned. Therefore, a sensible step to overcome this problem is to collect as many measurements as the number of the finite elements composing the medium. From one hand, this is not practically possible, on the other, an …
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Framed and Framing Inquiry: Development and Defence of John Dewey's Theory of Knowledge
… revised. In a framing inquiry, the problem is underdetermined by existing conceptual frameworks, which are created, revised, or expanded. My general argument is that Dewey’s main contribution and controversial claims should be understood in the context of framing inquiry. In Chapter 1, I set …
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Varieties of Naturalized Epistemology: Criticisms and Alternatives
… First, the naturalist's thesis that theory is underdetermined by evidence poses difficulties for the optimist's attempt to show that our beliefs are justified, even according to naturalized standards. Second, while critics usually contest naturalists' logical right to use the concept of …
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