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 323 for “"inverse problem"”.
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An inverse problem for networks
Thesis (M.S.)--Massachusetts Institute of Technology, Dept. of Electrical Engineering and Computer Science, 1990.
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Planar resistive tomography : an inverse problem
Thesis (S.B. and M.Eng.)--Massachusetts Institute of Technology, Dept. of Electrical Engineering and Computer Science, 2000.
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The inverse problem to the Voronoi diagram
… primary purpose of this thesis is to address the problem of solving the Inverse Problem for the Voronoi Diagram where the Inverse Problem is: Given a diagram that is in fact a Voronoi Diagram find the set of points X = {x1, x2, x3,…,x n} in R2 that will generate the diagram. In formulating a …
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On the Inverse Problem for Mahler Measure
We investigate a number of aspects of the inverse problem for Mahler Measure. If � is an algebraic unit, we demonstrate how to determine if there are any reciprocal numbers with measure �. We also give a formula for the number of integer polynomials with measure � and given degree.
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Scattering Techniques for the Geophysical Inverse Problem
We consider the inverse problem for the propagation of elastic waves in stratified media. The one-dimensional inverse problem for the propagation of shear waves is studied in the context of spectral theory. We generalize certain inverse scattering methods in quantum mechanics to determine the …
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On the Inverse Problem in Differential Galois Theory
… to the classical situation, one considers the inverse problem: Which linear algebraic groups occur as differential Galois groups over a given differential field? The main result of this thesis is the following theorem: Every linear algebraic group defined over the algebraically closed field K …
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Statistical analysis of fiber composite interphase inverse problem
Thesis (M.S.)--Massachusetts Institute of Technology, Dept. of Mechanical Engineering, 1994.
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A genetic algorithm applied to the fractal inverse problem
… on a finite number of parameters. The associated inverse problem, finding a set of parameters which reconstructs a given fractal, is much more difficult. This paper explores the possibility of solving the inverse program with the genetic algorithm.
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Microlocal regularity of an inverse problem for the multidimensional wave equation
… and ground-penetrating radar may be modeled as inverse problems for the multidimensional acoustic wave equation with point energy sources. The inverse problem is to identify the coefficients from the knowledge of boundary measurements of the solution. In this research we formulate an inverse …
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Monte Carlo solution to the inverse problem of ultrasonic defect characterisation
An important problem in the non-destructive testing of materials is the accurate determination of the location, size, shape and orientation of any detected flaws; this is essential for assessing integrity of inspected objects. This thesis presents a novel algorithm wherein recovery of the geometric …
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Inverse problem for stress in the earth based on geodetic data
Thesis (Ph.D.)--Massachusetts Institute of Technology, Dept. of Earth and Planetary Sciences, 1981.
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Photoacoustic image reconstruction to solve the acoustic inverse problem with deep learning
… show a promising path to solve the acoustic inverse problem and offer a quantitative and qualitative improvement over state-of-the-art techniques. The method developed in this thesis can be a further step on the road towards clinical quantitative photoacoustic imaging.
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Inverse-Problem Inspired Approaches in the Design of Solids for Frequency-Domain Dynamics
… that may represent poor solutions to a design problem, causing challenges for gradient-based optimization methods. Additionally, designs are typically characterized by high-dimensional parameter spaces, which require costly regularization operations and can lead to slow convergence. This …
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Measurement of residual stresses and solving the inverse problem to infer dislocation distributions
… formulation. The ability of the optimization problem to match the full strain field is explored as regions of measurements and components of strain are withheld. The aim is to develop a technique to reduce the number of residual strain measurements necessary to fully characterize the residual …
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Advances in Symbolic Regression: From Generalized Formulation to Density Estimation and Inverse Problem
… its potential across diverse domains and problem settings. Initially, we introduce GSR, a Generalized Symbolic Regression method that redefines the traditional SR optimization problem to discover analytical mappings from the input space to a transformed output space. The proposed GSR …
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Motion based design : solution algorithms to the inverse problem with applications to seismic design
Thesis (M.S.)--Massachusetts Institute of Technology, Dept. of Civil and Environmental Engineering, 1998.
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A circuit model for diffusive breast imaging and a numerical algorithm for its inverse problem
Thesis (M. Eng.)--Massachusetts Institute of Technology, Dept. of Electrical Engineering and Computer Science, 1996.
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An inverse problem framework for reconstruction of phonon properties using solutions of the Boltzmann transport equation
… is formulated as a non-convex optimization problem whose goal is to minimize the difference between the experimental results and the one calculated by a Boltzmann transport equation (BTE)-based model of the experimental process, with the desired material property treated as the unknown in …
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Models and algorithms of brain connectivity, spatial sparsity, and temporal dynamics for the MEG/EEG inverse problem
… of brain activity from MEG/EEG is an ill-posed inverse problem, with no unique solution in the absence of additional information. In this dissertation I analyze how solutions to the MEG/EEG inverse problem can be improved by including information about temporal dynamics of brain activity and …
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