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 51 for “"Adaptive methods"”.
-
Adaptive methods for meteor burst communications
We investigate various methods for making efficient use of the time-varying power received by radio reflection from meteor trails, including applications of variable-rate coding and variable-rate transmission. For variable-rate coding, the code rate is changed periodically during the life of the …
-
Self Adaptive Methods for Parabolic Partial Differential Equations
In many applications, the solutions to important partial differential equations are characterized by a sharp active region of transition (such as wave fronts or areas of rapid diffusion) surrounded by relatively calm stable regions. The numerical approximation to such a solution is based on a mesh …
-
High-order adaptive methods for computing invariant manifolds of maps
… author presents efficient and accurate numerical methods for computing invariant manifolds of maps which arise in the study of dynamical systems. In order to decrease the number of points needed to compute a given curve/surface, he proposes using higher-order interpolation/approximation techniques …
-
Essays on Adaptive Methods for Inference and Prediction under Dependence
… methodologies. In this thesis, we develop adaptive methods and conduct empirical studies on inference and prediction problems with dependent data. </p><p>Chapter 2 presents the contributions to adaptive methods for inference. In Chapter 2, we consider a causal inference problem in the …
-
Adaptive Methods of Resident Space Object Identification for Space Situational Awareness
… this research focuses on the development of adaptive methods for some of those parameters, particularly those of the Star elimination step of the RSOID algorithm. Star elimination is a process by which the detected image objects belonging to stars are identified and removed such that the RSO …
-
Multiresolution, adaptive methods and classification for image analysis of DNA autoradiographs
… For reconstructing the ordered sequence, several methods for classification of the feature set including statistical pattern recognition, expert system and adaptive network synthesis are evaluated. The major contributions include a new method of multiresolution signal analysis which is shown to be …
-
Bayesian adaptive methods to incorporate preclinical data into phase I clinical trials
… purposes of improving the design and analysis of adaptive phase I dose-escalation trials. Specifically, our focus is on the transition step of early drug development, where phase I clinical trials are preceded only with some preclinical information. We see preclinical data as a special type of …
-
A posteriori error estimates and adaptive methods for convection dominated transport processes
… be computed. <br>Using these theoretical results adaptive solution strategies are deduced, <br>implemented and tested for some model problems. <br>These adaptive techniques are applicable e.g. in two phase flow problems in <br>porous media or in the simulation of subsurface contaminant transport …
-
Adaptive methods for linear dynamic systems in the frequency domain with application to global optimization
… of the research, focused in two primary areas: adaptive frequency sweeps and efficient combinatorial optimization. The frequency sweep methods rely on an adaptive bisection of the frequency range and either a subspace approximation based on implicit interpolatory model order reduction or an …
-
Approximate L² Error Control by Solution Post-Processing for Finite Element Solutions of PDEs with Higher-Order Adaptive Methods
… cost of complex simulations. Mesh adaptation methods provide an automated way to determine the regions where a mesh needs the most refinement and generate a new mesh that efficiently targets these regions. In this thesis, we build on previous work in a posteriori error estimation and mesh …
-
Proposta e avaliação de um método adaptativo de corte de carga
This work deals with the evaluation of adaptive methods of load shedding. It is understood as adaptive methods, load shedding schemes that are able, through monitoring the state of the network, to estimate the unbalance between the load and the generation of the system and to adapt the amount of …
-
Smoothness and Adaptivity in Nonlinear Optimization for Machine Learning Applications
… Besides, existing theory cannot well explain why adaptive methods outperform gradient descent in certain machine learning tasks like training transformers. In this thesis, to bridge this gap, we propose more general smoothness conditions that are closer to machine learning practice and study the …
-
Empirical Approaches to Challenges in Neural Network Training and Deployment
… start by showing empirically that more popular adaptive optimizers do not perform worse than optimizers they can approximate with a practical amount of hyperparameter tuning, which contrasts with conventional wisdom that adaptive methods generalize worse than non-adaptive methods. We next focus …
-
Schur's Complement and Discontinuous Galerkin Methods for Domain Decomposition Solvers and Plasticity and Interface Evolution Analyses
Adaptive methods can be based on either conforming or non-conforming meshes. Though non-conforming meshes are easier to generate, they require the satisfaction of jump conditions across the non-conforming interface. In this work we develop a discontinuous Galerkin framework for such an adaptive …
-
Functional Regression and Adaptive Control
… regression method for parameter estimation and adaptive control in this dissertation. In the functional regression method, the regressors and a signal which contains the information of the unknown parameters are either determined from raw measurements or calculated as the functions of the …
-
Adaptive Pattern Modeling for Large Reflector Antennas
This thesis presents methods for modeling the pattern of large axisymmetric paraboloidal focus-fed reflector antenna systems. The intended application of these methods is to improve the performance of time-domain interference canceling (TDC) in radio astronomy. The first method yields a closed-form …
-
Wavelets and wavelet optimized-finite differences for electronic structure calculations
… on inhomogenous systems, it is desirable to use methods which adapt to the problem by using a spatially-varying level of resolution. A wavelet basis can efficiently represent a function which is rapidly varying in certain regions of space. One-dimensional calculations using Daubechies wavelets as …
-
On the Effect of Numerical Noise in Simulation-Based Optimization
… Navier-Stokes equations. All three problems use adaptive methods in the simulation of the constraint and are numerically noisy. Gradients for each problem are computed with both CSE and finite difference methods. The gradients are analyzed and compared. The two flow problems are optimized with a …
-
Explicitness in CALL Feedback for Enhancing Advanced ESL Learners' Grammar Skills
… learning (CALL) environment, and (b) examine adaptive methods of feedback delivery based on learners' performance. Both issues were examined within the context of a computer-based tutorial designed to help advanced Korean learners of English reduce overpassivization errors in academic writing. …
-
A 3-dimensional h-adaptive algorithm for species transport prediction
Development of 3-dimensional self-adaptive algorithms for unstructured finite element grids is recent to the solution of partial differential equations. An h-adaptive grid embedding method is employed to help solve the Navier-Stokes equations for fluid flow and scalar transport; This h-adaptive …
Page 1 of 3