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 14 of 14 for “"Projection Matrix"”.
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On the Dynamic Dichotomy between Positive Equilibria and Synchronous 2-cycles in Matrix Population Models
For matrix population models with nonnegative, irreducible and primitive inherent projection matrices, the stability of the branch of positive equilibria that bifurcates from the extinction equilibrium as the dominant eigenvalue of the inherent projection matrix increases through one is determined …
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Code Similarity Search in a Latent Space
… codes. Hence, I explore the idea of using projection matrix to the reduce dimensionality of the problem. One approach is to use random projection. The other approach that I explore is learning the projection matrix by developing a machine learning algorithm that is supervised using the …
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Homotopy methods for solving the optimal projection equations for the reduced order model problem
The optimal projection approach to solving the reduced order model problem produces two coupled, highly nonlinear matrix equations with rank conditions as constraints. Due to the resemblance of these equations to standard matrix Lyapunov equations, they are called modified Lyapunov equations. The …
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Acoustic Feature Design for Speech Recognition, a Statistical Information-Theoretic Approach
… with showing that the calculation of the LDA projection matrix is a maximum mutual information estimation problem in the lower-dimensional space with some constraints on the model of the joint conditional and unconditional PDFs of the features, and then, by relaxing these constraints, we …
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Bayesian and Information-Theoretic Learning of High Dimensional Data
… Bayesian Graphical LASSO, the inverse covariance matrix of the data distribution is assumed to be sparse, inducing a sparsely connected Gaussian graph. In the nonparametric Mixture of Factor Analyzers, the covariance matrices in the Gaussian Mixture Model are forced to be low-rank, which is …
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Assessing the global conservation status of ecologically poorly undertood, threatened chelonian species : the case of the critically endangered Madagascar spider tortoise (<i>Pyxis arachnoides</i>)
… Cormack-Jolly-Seber model and a stage class, projection matrix was developed to model mean annual survival, finite growth rate and population survival. Finally, remotely sensed habitat loss was monitored within the core of the species range. These data suggest that the species has suffered a …
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Application of the backward-smoothing extended Kalman filter to attitude estimation and prediction using radar observations
… the object's image. Therefore, the orthographic projection matrix that the computer graphics procedures computed to display the computer model, simultaneously describes the projection of the object onto the radar image plane. These measurements are essentially corrections to a nominal or baseline …
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In the Shadow of Prompts: Adversarial Attacks and Model Cloning in Large Language Models
… Earlier work has shown how to rebuild the output projection layer or distill surface behavior, but no attack has produced a deployable clone within a tight query budget. In this thesis, we address this problem by presenting a practical pipeline for cloning LLMs under constrained settings. The …
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Mark-recapture statistics and demographic analysis
… data and demographic models such as matrix population models and integrodifference models. I resolve some issues that are commonly encountered during sampling, such as the fact that the sex or life-stage of some individuals is unknown during some sampling occasions and that …
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Biological-physical interactions on Georges Bank : plankton transport and population dynamics of the ocean quahog, Arctica islandica
… residual flow for several days. Transport and matrix mode ls of Arctica populations were compared with field data; correlation of models with NMFS Survey data was best for realistic wind simulations from 1974 and 1991. Projection matrix eigenvalues were most sensitive to changes in adult and …
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Face Recognition in Unconstrained Conditions: Improving Face Alignment and Constructing a Pose-Invariant Compact Biometric Template
… face frontalization relies heavily on the projection matrix generated by face alignment, its performance has been largely constrained by the robustness of face alignment under unconstrained conditions. In the second method, using an ensemble deep neural network model for recognition has …
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Integer and Matrix Optimization: A Nonlinear Approach
… problems such as reduced rank regression and matrix completion contain rank constraints. These constraints are commonly viewed as separate entities and studied by separate subfields—integer and global optimization respectively—who propose entirely different strategies for optimizing over them. …
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Adaptive interference suppression algorithms for DS-UWB systems
… optimization (JIO) that jointly optimizes a projection vector and a reduced-rank filter by using the minimum mean-squared error (MMSE) criterion. A low-complexity scheme, named Switched Approximations of Adaptive Basis Functions (SAABF), is proposed as a modification of the generic scheme, in …
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Numerical methods for solar tomography in the STEREO era
… efficient computation of many of the tomographic projection matrices needed for the applications in this thesis.