Nancy Hitschfeld
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View article: GeoLinkage2.0 and GeoChecker: Hydroinformatics tools for large and complex hydrological-hydrogeological models using WEAP-MODFLOW. Case Study: Severe drought in the Limarí River Basin, Chile
GeoLinkage2.0 and GeoChecker: Hydroinformatics tools for large and complex hydrological-hydrogeological models using WEAP-MODFLOW. Case Study: Severe drought in the Limarí River Basin, Chile Open
Understanding and modeling surface and groundwater resources are critical due to the effects of droughts and climate change, especially in semi-arid, arid, or hyper-arid regions. GeoLinkage, developed by Troncoso (2021), facilitates the cr…
View article: CAT: Cellular Automata on Tensor cores
CAT: Cellular Automata on Tensor cores Open
Cellular automata (CA) are simulation models that can produce complex emergent behaviors from simple local rules. Although state-of-the-art GPU solutions are already fast due to their data-parallel nature, their performance can rapidly deg…
View article: A Class of Topological Pseudodistances for Fast Comparison of Persistence Diagrams
A Class of Topological Pseudodistances for Fast Comparison of Persistence Diagrams Open
Persistence diagrams (PD)s play a central role in topological data analysis, and are used in an ever increasing variety of applications. The comparison of PD data requires computing distances among large sets of PDs, with metrics which are…
View article: GPolylla: Fully GPU-accelerated polygonal mesh generator
GPolylla: Fully GPU-accelerated polygonal mesh generator Open
This work presents a fully GPU-accelerated algorithm for the polygonal mesh generator known as Polylla. Polylla is a tri-to-polygon mesh generator, which benefits from the half-edge data structure to manage any polygonal shape. The propose…
View article: A Class of Topological Pseudodistances for Fast Comparison of Persistence Diagrams
A Class of Topological Pseudodistances for Fast Comparison of Persistence Diagrams Open
Persistence diagrams (PD)s play a central role in topological data analysis, and are used in an ever increasing variety of applications. The comparison of PD data requires computing comparison metrics among large sets of PDs, with metrics …
View article: Rethinking Gender Diversity and Inclusion Initiatives for CS and SE in a University Setting
Rethinking Gender Diversity and Inclusion Initiatives for CS and SE in a University Setting Open
Jocelyn Simmonds, María Cecilia Bastarrica, Nancy Hitschfeld-Kahler, Pablo Villar Mascaró, Diego S. Wistuba La Torre, Jo Muñoz Montenegro, and Millaray Cárdenas
View article: 3D POLYLLA: Polyhedral meshing algorithm based on terminal-edge regions and terminal-face regions
3D POLYLLA: Polyhedral meshing algorithm based on terminal-edge regions and terminal-face regions Open
Polylla is a polygonal mesh algorithm that generates meshes with arbitrarily shaped polygons using the concept of terminal-edge regions. Until now, Polylla has been limited to 2D meshes, but in this work, we extend Polylla to 3D volumetric…
View article: An Evaluation of GPU Filters for Accelerating the 2D Convex Hull
An Evaluation of GPU Filters for Accelerating the 2D Convex Hull Open
The Convex Hull algorithm is one of the most important algorithms in computational geometry, with many applications such as in computer graphics, robotics, and data mining. Despite the advances in the new algorithms in this area, it is oft…
View article: A Scalable and Energy Efficient GPU Thread Map for m-Simplex Domains
A Scalable and Energy Efficient GPU Thread Map for m-Simplex Domains Open
This work proposes a new GPU thread map for $m$-simplex domains, that scales its speedup with dimension and is energy efficient compared to other state of the art approaches. The main contributions of this work are i) the formulation of th…
View article: A node-based uniform strain virtual element method for compressible and nearly incompressible elasticity
A node-based uniform strain virtual element method for compressible and nearly incompressible elasticity Open
We propose a combined nodal integration and virtual element method for compressible and nearly incompressible elasticity, wherein the strain is averaged at the nodes from the strain of surrounding virtual elements. For the strain averaging…
View article: GPU Parallel algorithm for the generation of polygonal meshes based on terminal-edge regions
GPU Parallel algorithm for the generation of polygonal meshes based on terminal-edge regions Open
This paper presents a GPU parallel algorithm to generate a new kind of polygonal meshes obtained from Delaunay triangulations. To generate the polygonal mesh, the algorithm first uses a classification system to label each edge of an input …
View article: POLYLLA: Polygonal meshing algorithm based on terminal-edge regions
POLYLLA: Polygonal meshing algorithm based on terminal-edge regions Open
This paper presents an algorithm to generate a new kind of polygonal mesh obtained from triangulations. Each polygon is built from a terminal-edge region surrounded by edges that are not the longest-edge of any of the two triangles that sh…
View article: Squeeze: Efficient Compact Fractals for Tensor Core GPUs
Squeeze: Efficient Compact Fractals for Tensor Core GPUs Open
This work presents Squeeze, an efficient compact fractal processing scheme for tensor core GPUs. By combining discrete-space transformations between compact and expanded forms, one can do data-parallel computation on a fractal with neighbo…
View article: A Topological Data Analysis Based Classifier
A Topological Data Analysis Based Classifier Open
Topological Data Analysis (TDA) is an emergent field that aims to discover topological information hidden in a dataset. TDA tools have been commonly used to create filters and topological descriptors to improve Machine Learning (ML) method…
View article: GeoLinkage: a GRASS-GIS plugin to integrate surface waters and groundwater in WEAP-MODFLOW models
GeoLinkage: a GRASS-GIS plugin to integrate surface waters and groundwater in WEAP-MODFLOW models Open
<p>Water resources management requires specialized computer tools that allow explicit integration of surface and groundwater fluxes, which generally have domains with different spatial discretization. On one hand, a surface hydrologi…
View article: Classification based on Topological Data Analysis
Classification based on Topological Data Analysis Open
Topological Data Analysis (TDA) is an emergent field that aims to discover topological information hidden in a dataset. TDA tools have been commonly used to create filters and topological descriptors to improve Machine Learning (ML) method…
View article: Optimising adjacent membrane segmentation and parameterisation in multicellular aggregates by piecewise active contours
Optimising adjacent membrane segmentation and parameterisation in multicellular aggregates by piecewise active contours Open
Summary In fluorescence microscopy imaging, the segmentation of adjacent cell membranes within cell aggregates, multicellular samples, tissue, organs, or whole organisms remains a challenging task. The lipid bilayer is a very thin membrane…
View article: Lessons Learned From Introducing Preteens in Parent-Led Homeschooling to Computational Thinking
Lessons Learned From Introducing Preteens in Parent-Led Homeschooling to Computational Thinking Open
Parents that homeschool their children ignore certain topics when they lack mastery or interest in them. Homeschool groups try to address this issue, cooperatively educating their children. We were contacted by such a group that wanted to …
View article: Erratum: “A 3D Voronoi+Gapper Galaxy Cluster Finder in Redshift Space to z ∼ 0.2. II. An Abundant Cluster Population Dominated by Late-type Galaxies Unveiled” (2018, ApJ, 869, 145)
Erratum: “A 3D Voronoi+Gapper Galaxy Cluster Finder in Redshift Space to z ∼ 0.2. II. An Abundant Cluster Population Dominated by Late-type Galaxies Unveiled” (2018, ApJ, 869, 145) Open
We identify 1901 galaxy clusters (N-g >= 2) with the VoML+G algorithm (Paper I) on the Two-Degree Field Galaxy Redshift Survey. We present the 341 clusters with at least 10 galaxies that are within 0.009 < z < 0.14 (the Catalog), of which …
View article: Convex Polygon Packing Based Meshing Algorithm for Modeling of Rock and Porous Media
Convex Polygon Packing Based Meshing Algorithm for Modeling of Rock and Porous Media Open
In this work, we propose new packing algorithm designed for the generation of polygon meshes to be used for modeling of rock and porous media based on the virtual element method. The packing problem to be solved corresponds to a two-dimens…
View article: Impact of Urban Growth and High Residential Irrigation on Streamflow and Groundwater Levels in a Peri‐Urban Semiarid Catchment
Impact of Urban Growth and High Residential Irrigation on Streamflow and Groundwater Levels in a Peri‐Urban Semiarid Catchment Open
The impact of urbanization on groundwater is not simple to understand, as it depends on a variety of factors such as climate, hydrogeology, water management practices, and infrastructure. In semiarid landscapes, the urbanization processes …
View article: A 3D Voronoi+Gapper Galaxy Cluster Finder in Redshift Space to z ∼ 0.2. II. An Abundant Cluster Population Dominated by Late-type Galaxies Unveiled
A 3D Voronoi+Gapper Galaxy Cluster Finder in Redshift Space to z ∼ 0.2. II. An Abundant Cluster Population Dominated by Late-type Galaxies Unveiled Open
We identify 1901 galaxy clusters ( N g ≥ 2) with the VoML+G algorithm (Paper I) on the Two-Degree Field Galaxy Redshift Survey. We present the 341 clusters with at least 10 galaxies that are within 0.009 < z < 0.14 (the Catalog), of which …
View article: Decomposition of 2D polygons and its effect in hydrological models
Decomposition of 2D polygons and its effect in hydrological models Open
2D non-uniform polygonal meshes allow representation of the impact of landscape elements and small infrastructures on water flows. The initial vectorial mesh, derived from the intersection of several geographical information systems' layer…
View article: A French-Spanish Multimodal Speech Communication Corpus Incorporating Acoustic Data, Facial, Hands and Arms Gestures Information
A French-Spanish Multimodal Speech Communication Corpus Incorporating Acoustic Data, Facial, Hands and Arms Gestures Information Open
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