1,721,011 research outputs found
Load balancing of irregular parallel applications on heterogeneous computing environments
No full textLarge-scale heterogeneous distributed computing environments (such as Computational
Grids and Clouds) offer the promise of access to a vast amount of computing
resources at a relatively low cost. In order to ease the application development and
deployment on such complex environments, high-level parallel programming languages
exist that need to be supported by sophisticated runtime systems. One of the main
problems that these runtime systems need to address is dynamic load balancing that
ensures that no resources in the environment are underutilised or overloaded with
work.
This thesis deals with the problem of obtaining good speedups for irregular applications
on heterogeneous distributed computing environments. It focuses on workstealing
techniques that can be used for load balancing during the execution of irregular
applications. It specifically addresses two problems that arise during work-stealing:
where thieves should look for work during the application execution and how victims
should respond to steal attempts.
In particular, we describe and implement a new Feudal Stealing algorithm and
also we describe and implement new granularity-driven task selection policies in the
SCALES simulator, which is a work-stealing simulator developed for this thesis. In addition,
we present the comprehensive evaluation of the Feudal Stealing algorithm and
the granularity-driven task selection policies using the simulations of a large class of
regular and irregular parallel applications on a wide range of computing environments.
We show how the Feudal Stealing algorithm and the granularity-driven task selection
policies bring significant improvements in speedups of irregular applications, compared
to the state-of-the-art work-stealing algorithms. Furthermore, we also present the implementation
of the task selection policies in the Grid-GUM runtime system [AZ06]
for Glasgow Parallel Haskell (GpH) [THLPJ98], in addition to the implementation in
SCALES, and we also present the evaluation of this implementation on a large set of
synthetic applications
Going Beyond Counting First Authors in Author Co-citation Analysis
Get PDFThe 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
Get PDF“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
Get PDFWe 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
gwastro/gw150914-fig4b: Release for Submission
No full textRelease for submission to journal and arXiv.
Includes instructions for setting up LIGO Diskcache API and Datafind server
gwastro/gw150914-fig4b: Initial Release for Submission
No full textRelease for submission of the paper to arXiv and to the journal
Dispelling the Myths Behind First-author Citation Counts
Get PDFWe 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
koamabayili/VECTRON-author-checklist: VECTRON author checklist
No full textWe have done our best to complete the author checklist relating to the use of animals in the hut study. Note that the objective for the hut study was to evaluate the IRS treatment applications for residual efficacy against Anopheles mosquitoes, including the local An. coluzzii mosquito population. Cows were only used to attract mosquitoes into the huts and no tests were carried out directly on the cows. The author checklist is intended for use with studies where experiments are carried out on animals, which is why we have had such difficulty in completing this for the hut study, as many of the questions do not relate to how the cows were used
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