Now showing items 11-20 of 35
Approximate Inverse Scattering Using Pseudodifferential Scaling
This thesis proposes a computationally efficient method for approximating the inverse of the normal operator arising in the linearized inverse problem for reflection seismology. The inversion of the normal operator using ...
P-Splines Using Derivative Information
Time series associated with single-molecule experiments and/or simulations contain a wealth of multiscale information about complex biochemical systems. However efficiently extracting and representing useful physical ...
Analysis of Two Mathematical Models for the Coupled Navier-Stokes/Darcy Problem
This paper introduces and analyzes two models coupling of incompressible Navier-Stokes equations with the porous media flow equations. A numerical method that uses continuous finite elements in the incompressible flow ...
PSQR: A Stable and Efficient Penalized Spline Algorithm
We introduce an algorithm for reliably computing quantities associated with several types of semiparametric mixed models in situations where the condition number on the random effects matrix is large. The algorithm is ...
A Parameter Free ADI-like Method for the Numerical Solution of Large Scale Lyapunov Equations
An algorithm is presented for constructing an approximate numerical solution to a large scale Lyapunov equation in low rank factored form. The algorithm is based upon a synthesis of an approximate power method and an ...
Getting It Right Without Knowing the Answer: Quality Control in a Large Seismic Modeling Project
Phase I of the SEAM Project will produce a variable-density acoustic synthetic survey over a 3D geological model simulating a deepwater subsalt exploration target. Due to the intended use of the data, the project places a ...
Mass Lumping For Constant Density Acoustics
Mass lumping provides an avenue for efficient time-stepping of time-dependent problems with conforming finite element discretization. Typical justifications for mass lumping use quadrature error estimates which do not hold ...
User's Guide For YALL1: Your Algorithms for L1 Optimization
This User's Guide describes the functionality and basic usage of the Matlab package YALL1 for L1 minimization. The one-for-six algorithm used in the YALL1 solver is briefly introduced in the appendix.
The Nonlinear Differential Semblance Algorithm for Plane Waves in Layered Media
This paper proposes an alternative approach to the output least-squares (OLS) seismic inversion for layered-media. The latter cannot guarantee a reliable solution for either synthetic or field data, because of the existence ...
A Software Framework for Finite Difference Simulation
This paper describes a software framework for solving time dependent PDEs in simple domains using finite difference (FD) methods. The framework is designed for parallel computations on distributed and shared memory computers, ...