1,720,995 research outputs found
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
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
GPU basierte volumetrische anisotrope Diffusion
No full textDie vorliegende Arbeit beschäftigt sich mit der effizienten Umsetzung volumetrischer Diffusionsfilter auf modernen Grafikkarten. Im Vordergrund stehen dabei die zu erwartenden Geschwindigkeitsvorteile, die sich durch eine geschickte GPGPU Implementierung und die damit einhergehende massiv parallelisierte Ausführung erzielen lassen. Es zeigt sich, dass volumetrische Diffusionsfilter auf Grafikkarten von 40 bis 80-fachen Geschwindigkeitssteigerungen verglichen mit reinen CPU Lösungen profitieren können - und das auf handelsüblicher Hardware, die in vielen Heimcomputern zu finden ist. Mit dieser Arbeit liegt außerdem ein fundierter Wegweiser vom physikalisch motivierten Hintergrund, über die verschiedenen mathematischen Formulierung bis hin zur Implementierung vor, der es dem interessierten Leser ermöglicht, volumetrische anisotrope Diffusionsfilter effizient und unabhängig von der verwendeten Hardwarearchitektur zu entwickeln.The presented work deals with the efficient implementation of volumetric diffusion filters on modern graphic cards. The focal point is on the speed advantages one can expect from a suitable GPGPU implementation and the resulting massively parallelized execution. It shows that volumetric diffusion filters can achieve from 40 up to 80 times the speed compared to pure CPU solutions - on mid-end commercial hardware, found in many home computers today. This work is moreover a guideline, dealing with the physically motivated background and the different mathematical models up to the implementation, which enables the interested readers to develop their own volumetric anisotropic diffusion filters efficiently, regardless of the underlying hardware architecture
Interaktive Visualisierung variierender Isoflächen mit trivariaten Splines auf massiv parallelen Prozessoren
No full textDie Visualisierung von skalaren Volumendaten, wie sie beispielsweise bei CT- oder MRT-Scans generiert werden, ist Thema aktueller Forschungen. Bei den Daten handelt es sich um Dichtewerte auf einem dreidimensionalen regulären Gitter. Unterschieden wird zwischen der direkten Volumenvisualisierung und der Darstellung sogenannter Isoflächen. Anwendung findet die Volumenvisualisierung im Bereich der modernen medizinischen Diagnostik und der industriellen Qualitätskontrolle. In dieser Diplomarbeit wird untersucht, inwieweit moderne Grafikkarten mit ihren massiv parallelen Prozessoren in der Lage sind, interaktive Rekonstruktionen von qualitativ hochwertigen Isoflächen zu liefern. Dabei wird das gesamte Volumen mittels trivariater Splines in Bernstein-Bézier-Form beschrieben. Alle Isoflächen liegen somit implizit vor und werden mit einem präzisen Ray-Casting-Verfahren interaktiv visualisiert. Die verwendeten Splines verfügen über garantierte Glattheitsbedingungen bei niedrigem Grad, um eine hochqualitative sowie effiziente Visualisierung gegenüber Standardverfahren zu erreichen. Der vorgestellte parallele GPU-Algorithmus nutzt die Bernstein-Bézier- Form, Instancing-Techniken und neueste Shader-4.0-Funktionalitäten, um die Rekonstruktionszeiten gegenüber einer optimierten CPU-Version bis zu 68-fach zu beschleunigen. Zusätzlich wird der benötigte Speicher deutlich reduziert und die Bildrate erhöht. Die Zeitmessungen einer kombinierten CUDA-OpenGL-Implementierung belegen, dass ein interaktives Variieren der Isowerte auch bei großen Datensätzen durch Auslagerung aller Berechnungsschritte auf die Grafikkarte möglich ist. Folglich ist der gezeigte Algorithmus eine signifikante Verbesserung der praktischen Anwendung von trivariaten Splines für die Echtzeitvisualisierung
Author-wise bibliometric analysis based on entropy.
No full textAuthor-wise bibliometric analysis based on entropy.</p
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