7,250 research outputs found
Enhancing Energy Production with Exascale HPC Methods
High Performance Computing (HPC) resources have become the key actor for achieving more ambitious challenges in many disciplines. In this step beyond, an explosion on the available parallelism and the use of special purpose
processors are crucial. With such a goal, the HPC4E project applies new exascale HPC techniques to energy industry simulations, customizing them if necessary, and going beyond the state-of-the-art in the required HPC exascale
simulations for different energy sources. In this paper, a general overview of these methods is presented as well as some specific preliminary results.The research leading to these results has received funding from the European Union's Horizon 2020 Programme (2014-2020) under the HPC4E Project (www.hpc4e.eu), grant agreement n° 689772, the Spanish Ministry of
Economy and Competitiveness under the CODEC2 project (TIN2015-63562-R), and
from the Brazilian Ministry of Science, Technology and Innovation through Rede
Nacional de Pesquisa (RNP). Computer time on Endeavour cluster is provided by the
Intel Corporation, which enabled us to obtain the presented experimental results in
uncertainty quantification in seismic imagingPostprint (author's final draft
Context-aware visual exploration of molecular databases
Facilitating the visual exploration of scientific data has
received increasing attention in the past decade or so. Especially
in life science related application areas the amount
of available data has grown at a breath taking pace. In this
paper we describe an approach that allows for visual inspection
of large collections of molecular compounds. In
contrast to classical visualizations of such spaces we incorporate
a specific focus of analysis, for example the outcome
of a biological experiment such as high throughout
screening results. The presented method uses this experimental
data to select molecular fragments of the underlying
molecules that have interesting properties and uses the
resulting space to generate a two dimensional map based
on a singular value decomposition algorithm and a self organizing
map. Experiments on real datasets show that
the resulting visual landscape groups molecules of similar
chemical properties in densely connected regions
StarGO: A New Method to Identify the Galactic Origins of Halo Stars
We develop a new method StarGO (Stars' Galactic Origin) to identify the
galactic origins of halo stars using their kinematics. Our method is based on
self-organizing map (SOM), which is one of the most popular unsupervised
learning algorithms. StarGO combines SOM with a novel adaptive group
identification algorithm with essentially no free parameters. In order to
evaluate our model, we build a synthetic stellar halo from mergers of nine
satellites in the Milky Way. We construct the mock catalogue by extracting a
heliocentric volume of 10 kpc from our simulations and assigning expected
observational uncertainties corresponding to bright stars from Gaia DR2 and
LAMOST DR5. We compare the results from StarGO against that from a
Friends-of-Friends (FoF) based method in the space of orbital energy and
angular momentum. We show that StarGO is able to systematically identify more
satellites and achieve higher number fraction of identified stars for most of
the satellites within the extracted volume. When applied to data from Gaia DR2,
StarGO will enable us to reveal the origins of the inner stellar halo in
unprecedented detail.Comment: 11 pages, 7 figures, Accepted for publication in Ap
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