We study the problems related to the estimation of the Gini index in presence of a fat-tailed data generating process, i.e. one in the stable distribution class with finite mean but infinite variance (i.e. with tail index α∈(1,2)). We show that, in such a case, the Gini coefficient cannot be reliably estimated using conventional nonparametric metho...
Published in IEEE transactions on image processing : a publication of the IEEE Signal Processing Society
Hyperspectral unmixing while considering endmember variability is usually performed by the normal compositional model, where the endmembers for each pixel are assumed to be sampled from unimodal Gaussian distributions. However, in real applications, the distribution of a material is often not Gaussian. In this paper, we use Gaussian mixture models ...
Published in IEEE transactions on image processing : a publication of the IEEE Signal Processing Society
Light field imaging extends the traditional photography by capturing both spatial and angular distribution of light, which enables new capabilities, including post-capture refocusing, post-capture aperture control, and depth estimation from a single shot. Micro-lens array (MLA) based light field cameras offer a cost-effective approach to capture li...
Published in IEEE transactions on image processing : a publication of the IEEE Signal Processing Society
The compact descriptors for visual search (CDVS) standard from ISO/IEC moving pictures experts group has succeeded in enabling the interoperability for efficient and effective image retrieval by standardizing the bitstream syntax of compact feature descriptors. However, the intensive computation of a CDVS encoder unfortunately hinders its widely de...
El objetivo del presente documento es describir la estructura de la administración pública costarricense, junto con el marco normativo que lo regula. El diseño de administración pública es complejo y posee gran diversidad de actores y órganos; no obstante, en el presente documento se aplican técnicas de investigación descriptiva para analizar los p...
Published in Contabilidad y Negocios
El presente documento analiza las distintas ramas del derecho que inciden en el mundo de los negocios. Comienza con las áreas más conocidas en la materia, como lo es el derecho comercial internacional y el derecho aduanero, haciendo referencia a los tratados más relevantes en la materia. Continúa con otras áreas relevantes, como derecho ambiental, ...
In this paper, we study the generalized Douglas-Rachford algorithm and its cyclic variants which include many projection-type methods such as the classical Douglas-Rachford algorithm and the alternating projection algorithm. Specifically, we establish several local linear convergence results for the algorithm in solving feasibility problems with fi...
Deep generative models have been successfully used to learn representations for high-dimensional discrete spaces by representing discrete objects as sequences and employing powerful sequence-based deep models. Unfortunately, these sequence-based models often produce invalid sequences: sequences which do not represent any underlying discrete structu...
We use high-resolution continuum images obtained at 870microns with the Atacama Large Millimeter Array (ALMA) to probe the surface density of star-formation in z~2 galaxies and study the different physical properties between galaxies within and above the star-formation main sequence of galaxies. This sample of eight star-forming galaxies at z~2 sel...
In recent years, the number of biomedical publications has steadfastly grown, resulting in a rich source of untapped new knowledge. Most biomedical facts are however not readily available, but buried in the form of unstructured text, and hence their exploitation requires the time-consuming manual curation of published articles. Here we present INtE...
