1,721,069 research outputs found
Enzo for the Exascale Era (Enzo-E)
No full textPoster for CSSI PI meeting Sept. 26-27, 2023. Describes progress made with the community application software package Enzo-E, the highly scalable version of the popular Enzo hydrodynamic cosmology adaptive mesh refinement code. </p
Recommended from our members
CAREER: Modeling the Evolution of Massive Galaxies with Enzo-E
No full textData management plan for the grant, "CAREER: Modeling the Evolution of Massive Galaxies with Enzo-E.
Collaborative Research: Framework: Software: NSCI: Enzo for the Exascale Era (Enzo-E)
No full textThis project is concerned with getting our adaptive mesh refinement (AMR) astrophysics and cosmology application to run efficiently on upcoming Exascale platforms. Our approach has been to develop Enzo-E, the "Extreme" scalable version of our mature ENZO structured-AMR MPI code. Two key features of Enzo-E are 1) it is built on a re-designed scalable "array-of-octree" AMR framework, Cello; and 2) it is parallelized using Charm++ rather than MPI. Charm++'s asynchronous and data-driven task-based parallel programming approach explicitly targets Exascale application development, and is well-suited for the irregular and dynamic data structures inherent in AMR applications. Weak scaling of Enzo-E is excellent, with demonstrated scaling on some of the largest NSF systems available, including Blue Waters at NCSA and Frontera at TACC. Recent accomplishments include additional
physics capabilities, scalable I/O, Version 1.0 release, and the first science publication citing results obtained from Enzo-E simulations.OAC-183540
Collaborative Research: Framework: Software: NSCI: Enzo for the Exascale Era (Enzo-E)
No full textOur project is concerned with getting our astrophysics and cosmology application to run efficiently on upcoming Exascale platforms. Our approach is to develop Enzo-E, the "exascalable" version of our mature ENZO adaptive mesh refinement code. Two key features of Enzo-E are first, using a totally re-designed octree-based AMR framework called Cello; and second, using Charm++ instead of MPI. Charm++ is an asynchronous data-driven task-based parallel programming system, that explicitly targets Exascale application development. Weak scaling of Enzo-E is excellent, with demonstrated scaling of a hydrodynamics AMR test problem on over 1/4 million cores of NSF's Blue Waters supercomputer with 98% parallel efficiency. Our next steps are to finish developing scalable I/O, work on supporting GPU's, and begin using Enzo-E for science runs later this year.</div
Going Beyond Counting First Authors in Author Co-citation Analysis
Full text linkThe present study examines one of the fundamental aspects of author co-citation analysis (ACA) - the way co-citation
counts are defined. Co-citation counting provides the data on which all subsequent statistical analyses and mappings
are based, and we compare ACA results based on two different types of co-citation counting - the traditional type that
only counts the first one among a cited work's authors on the one hand and a non-traditional type that takes into
account the first 5 authors of a cited work on the other hand. Results indicate that the picture produced through this non-traditional author co-citation counting contains more coherent author groups and is therefore considerably clearer. However, this picture represents fewer specialties in the research field being studied than that produced through the traditional first-author co-citation counting when the same number of top-ranked authors is selected and analyzed. Reasons for these effects are discussed
Variations on the Author
Full text link“Variations on the Author” discusses two of Eduardo Coutinho’s recent films (Um Dia na Vida, from 2010, and Últimas Conversas, posthumously released in 2015) and their contribution to the general question of documentary authorship. The director’s filmography is characterized by a consistent yet self-effacing form of authorial self-inscription: Coutinho often features as an interviewer that rather than express opinions propels discourses; an interviewer that is good at listening. This mode of self-inscription characterizes him as an author who is not expressive but who is nonetheless markedly present on the screen. In Um Dia na Vida, however, Coutinho is completely absent form the image, while Últimas Conversas, on the contrary, includes a confessional prologue that moves the director from the margins to the center of his films. This article examines the ways in which these works stand out in the filmography of a director who offers new insights into the notion of cinematic authorship
Appropriate Similarity Measures for Author Cocitation Analysis
Full text linkWe provide a number of new insights into the methodological discussion about author cocitation analysis. We first argue that the use of the Pearson correlation for measuring the similarity between authors’ cocitation profiles is not very satisfactory. We then discuss what kind of similarity measures may be used as an alternative to the Pearson correlation. We consider three similarity measures in particular. One is the well-known cosine. The other two similarity measures have not been used before in the bibliometric literature. Finally, we show by means of an example that our findings have a high practical relevance.information science;Pearson correlation;cosine;similarity measure;author cocitation analysis
Dispelling the Myths Behind First-author Citation Counts
Full text linkWe conducted a full-scale evaluative citation analysis study of scholars in the XML research field to explore just how different from each other author rankings resulting from different citation counting methods actually are, and to demonstrate the capability of emerging data and tools on the Web in supporting more realistic citation counting methods. Our results contest some common arguments for the continued
use of first-author citation counts in the evaluation of scholars, such as high correlations between author rankings by first-author citation counts and other citation
counting methods, and high costs of using more realistic citation counting methods that are not well-supported by the ISI databases. It is argued that increasingly available digital full text research papers make it possible for citation analysis studies to go beyond what the ISI databases have directly supported and to employ more
sophisticated methods
- …
