1,720,999 research outputs found
Data for reproducing results in the paper A posteriori error estimates based on multilevel decompositions with large problems on the coarsest level
No full text<p>Data for reproducing results in P. Vacek, J. Papež and Z. Strakoš, A posteriori error estimates based on multilevel decompositions with large problems on the coarsest level.</p>
<p>See https://github.com/vacek-petr/inMLEstimate</p>
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
Multigrid methods for large-scale problems: approximate coarsest-level solves and mixed precision computation
No full textTitle: Multigrid methods for large-scale problems: approximate coarsest-level solves and mixed precision computation Author: Petr Vacek Department: Department of Numerical Mathematics Supervisor: Erin Claire Carson, Ph.D., Department of Numerical Mathematics Abstract: The development of new computational hardware components opens possibilities to solve larger and larger problems. It, however, also brings new challenges. In this thesis we study multigrid methods for solving large-scale systems of linear equations. The multigrid approach relies on having a hierarchy of problems, ranging from the smallest (coarsest-level) problem to the original (finest-level) problem. We focus on settings where even the problem on the coarsest-level is large and can be solved only approximately. Such hierarchies arise, for example, when solving problems on domains with complicated geometry or when computing in parallel. We present an approach for analyzing the effects of approximate coarsest-level solves on the convergence of the multigrid V-cycle scheme and derive new coarsest-level stopping criteria tailored to multigrid methods. The multigrid hierarchy can be also used to construct residual-based a posteriori error estimates. We present a new approximation of the term associated with the coarsest level, which results in..
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
Víceúrovňové metody pro řešení velkých problémů: přibližné řešení na nejhrubší síti, počítání ve smíšené přesnosti
Get PDFTitle: Multigrid methods for large-scale problems: approximate coarsest-level solves and mixed precision computation Author: Petr Vacek Department: Department of Numerical Mathematics Supervisor: Erin Claire Carson, Ph.D., Department of Numerical Mathematics Abstract: The development of new computational hardware components opens possibilities to solve larger and larger problems. It, however, also brings new challenges. In this thesis we study multigrid methods for solving large-scale systems of linear equations. The multigrid approach relies on having a hierarchy of problems, ranging from the smallest (coarsest-level) problem to the original (finest-level) problem. We focus on settings where even the problem on the coarsest-level is large and can be solved only approximately. Such hierarchies arise, for example, when solving problems on domains with complicated geometry or when computing in parallel. We present an approach for analyzing the effects of approximate coarsest-level solves on the convergence of the multigrid V-cycle scheme and derive new coarsest-level stopping criteria tailored to multigrid methods. The multigrid hierarchy can be also used to construct residual-based a posteriori error estimates. We present a new approximation of the term associated with the coarsest level, which results in...Název práce: Víceúrovňové metody pro řešení velkých problémů: přibližné řešení na nejhrubší síti, počítání ve smíšené přesnosti Autor: Petr Vacek Katedra: Katedra numerické matematiky Vedoucí disertační práce: Erin Claire Carson, Ph.D., Katedra numerické matematiky Abstrakt: Vývoj nového výpočetního hardwaru otevírá možnosti řešení větších a větších problémů. Přináší ale také nové výzvy. V této práci se zabýváme víceúrovňovými metodami pro řešení velkých soustav lineárních rovnic. Víceúrovňové metody využívají hierarchii problémů s různými velikostmi, od nejmenšího problému (nejhrubší úroveň) až po původní problém (nejjemnější úroveň). V této práci uvažujeme hierarchie, kde i problém na nejhrubší úrovni je velký a jeho řešení lze spočítat pouze přibližně. Takové hierarchie vznikají například při řešení problémů na oblastech se složitou geometrií nebo při paralelních výpočtech. Jedním z hlavních výsledků této práce je nový přístup k analýze vlivu přibližného řešení na nejhrubší úrovni na konvergenci V-cycle schématu a odvození nového zastavovacího kritéria pro řešení problému na nejhrubší úrovni. Víceúrovňovou hierarchii je možné využít také ke konstrukci a posteriori odhadu chyby na základě rezidua. Dalším hlavním výsledkem této práce je nový postup aproximace členu odpovídajícímu nejhrubší úrovni, který...Katedra numerické matematikyDepartment of Numerical MathematicsMatematicko-fyzikální fakultaFaculty of Mathematics and Physic
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