Zobrazeno 1 - 10
of 62
pro vyhledávání: '"Español, Malena"'
We consider an $\ell_1$-regularized inverse problem where both the forward and regularization operators have a Kronecker product structure. By leveraging this structure, a joint decomposition can be obtained using generalized singular value decomposi
Externí odkaz:
http://arxiv.org/abs/2409.00883
$\ell_1$ regularization is used to preserve edges or enforce sparsity in a solution to an inverse problem. We investigate the Split Bregman and the Majorization-Minimization iterative methods that turn this non-smooth minimization problem into a sequ
Externí odkaz:
http://arxiv.org/abs/2404.19156
Autor:
Español, Malena I., Jeronimo, Gabriela
Variable projection methods prove highly efficient in solving separable nonlinear least squares problems by transforming them into a reduced nonlinear least squares problem, typically solvable via the Gauss-Newton method. When solving large-scale sep
Externí odkaz:
http://arxiv.org/abs/2402.08568
Autor:
Breckling, Sean, Español, Malena I., Uribe, Victoria, Bobmara, Chrisitan, Pillow, Jordan, Baldonado, Brandon
We present a note on the implementation and efficacy of a box-constrained $L_1/L_2$ regularization in numerical optimization approaches to performing tomographic reconstruction from a single projection view. The constrained $L_1/L_2$ minimization pro
Externí odkaz:
http://arxiv.org/abs/2303.08292
In this paper, we extend the discrete-to-continuum procedure we developed in our previous work to derive a continuum variational model for a hexagonal twisted bilayer material in which one layer is fixed. We use a discrete energy containing elastic t
Externí odkaz:
http://arxiv.org/abs/2209.02622
Autor:
Breckling, Sean, Dresselhaus-Marais, Leora E., Machorro, Eric, Brennan, Michael C., Pillow, Jordan, Espanol, Malena, Kozioziemski, Bernard, Coffee, Ryan, Kim, Sunam, Kim, Sangsoo, Nam, Daewoong, Gonzales, Arnulfo, Lund, Margaret, Adams, Jesse, Champion, Daniel, Williams, Ajanae, Joyce, Kevin, Howard, Marylesa
High-brightness X-ray pulses, as generated at synchrotrons and X-ray free electron lasers (XFEL), are used in a variety of scientific experiments. Many experimental testbeds require optical equipment, e.g Compound Refractive Lenses (CRLs), to be prec
Externí odkaz:
http://arxiv.org/abs/2208.11250
The image deblurring problem consists of reconstructing images from blur and noise contaminated available data. In this AMS Notices article, we provide an overview of some well known numerical linear algebra techniques that are use for solving this p
Externí odkaz:
http://arxiv.org/abs/2201.09831
We study the aggregation phenomenon in lyotropic chromonic liquid crystals as the molecular concentration changes and condensing agents are added into the system. Using properties of the critical points of the Oseen-Frank energy of a nematic liquid c
Externí odkaz:
http://arxiv.org/abs/2110.15445
We consider efficient methods for computing solutions to dynamic inverse problems, where both the quantities of interest and the forward operator (measurement process) may change at different time instances but we want to solve for all the images sim
Externí odkaz:
http://arxiv.org/abs/2107.05727