Now showing items 11-16 of 16
Migration Velocity Analysis and Waveform Inversion
Waveform (output least squares) inversion of seismic reflection data can reconstruct remarkably detailed models of subsurface structure, and take into account essentially any physics of seismic wave propagation that can ...
Optimal Reorientation of Spacecraft Using Only Control Moment Gyroscopes
Spacecraft reorientation can require propellant even when using gyroscopes since these have momentum saturation limits at which control is lost until thrusters are fired to desaturate them. To eliminate this need and thereby ...
A Time-Stepping Library For Simulation-Driven Optimization
The Timestepping Simulation for Optimization ("TSOpt") library provides an interface for time-stepping simulation. It packages a simulator togehter with its derivatives ("sensitivities") and adjoint derivaties with respect ...
Quantitative Object Reconstruction using Abel Transform X-Ray Tomography and Mixed Variable Optimization
This paper introduces a new approach to the problem of quantitatively reconstructing cylindrically symmetric objects from radiograph data obtained via x-ray tomography. Specifically, a mixed variable programming (MVP) ...
A Comparison of Three Total Variation Based Texture Extraction Models
This paper qualitatively compares three recently proposed models for signal/image texture extraction based on total variation minimization:the Meyer, Vese-Osher, and TV-L1 models. We formulate discrete versions of these ...
A New Alternating Minimization Algorithm for Total Variation Image Reconstruction
We propose, analyze and test an alternating minimization algorithm for recovering images from blurry and noisy observa- tions with total variation (TV) regularization. This algorithm arises from a new half-quadratic model ...