1,720,973 research outputs found
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
Dynamische Ressourcenzuweisung für Video-Streaming mit geringer Verzögerung im Uplink von OFDMA-Mobilfunknetzen
No full textIn recent years, video has been inducing an exponential growth in mobile traffic. Today, mobile operators pay several billions of euros for radio frequency bands to cope with enormous traffic demands. At the same time, the enduring demand growth increasingly forces mobile operators and video service providers to look for efficient solutions to make the best possible service quality out of the limited radio spectrum.
This thesis focuses on improving the Quality of Experience (QoE) of multiple low-delay video streams in the uplink of mobile networks using Orthogonal Frequency Division Multiple Access (OFDMA). Several mobile networks like LTE and WiMAX have been using OFDMA. In that context, this thesis provides multiple contributions. The first contribution is a novel dynamic resource allocation approach, which exploits wireless channels’ random variations to improve user throughput while suppressing Multiple Access Interference (MAI). MAI presents when user signals are not perfectly synchronous in the uplink of OFDMA networks. Next, the thesis presents two cross-layer video adaptation approaches, which adopt the introduced dynamic resource allocation approach.
Those two approaches target low-delay video streaming services using non-layered and layered video coding. While the video industry has been broadly using non-layered video coding, layered video coding might be more prevalent in the future. Those two technologies have distinct adaptation principles, so they require different solutions tailored particularly for them. In both cases, via efficient mathematical transformations, the large-timescale problem of video adaptation (in a few seconds) is pursued via a series of small-timescale resource allocation problems (each in a few milliseconds). By doing that, video adaptation algorithms can quickly react to wireless channel variations and meet low latency requirements. As for non-layered video coding, another contribution is to consider potential throughput gains via efficient resource allocation algorithms as selecting video quality. Throughout the thesis, we develop several mathematical optimization problems and adaptation algorithms to determine the performance gain of proposed approaches.In den letzten Jahren war Video der Haupttreiber für das exponentielle Wachstum des mobilen Verkehrs. Heute zahlen Mobilfunkbetreiber mehrere Milliarden Euro für die Funkfrequenz, um die enorme Verkehrsanforderung zu bewältigen. Gleichzeitig zwingt das anhaltende Wachstum Mobilfunkbetreiber und Videodienstanbieter zunehmend dazu, nach effizienten Lösungen zu suchen, um aus dem begrenzten Funkspektrum die bestmögliche Servicequalität zu erzielen.
Diese Arbeit konzentriert sich auf die Herausforderungen bei der Verbesserung der Nutzerzufriedenheit (Quality of Experience, QoE) des Videostreams mit niedriger Latenz im Uplink von OFDMA (Orthogonal Frequency Division Multiple Access) Mobilfunknetz. Mehrere Mobilfunknetze wie LTE und WiMAX verwenden OFDMA. In diesem Zusammenhang liefert diese Arbeit mehrere Beiträge. Der erste Beitrag ist ein neuartiger Ansatz zur dynamischen Ressourcenvergabe. Einerseits nutzt der vorgeschlagene Ansatz die zufällige Variation des Funkkanals, um den Benutzerdurchsatz zu verbessern. Andererseits werden einige Frequenzressourcen als Schutzbänder verwendet, um die Mehrfachzugriffsstörung MAI (Multiple Access Interference) zu unterdrücken. MAI präsentiert, da Benutzersignale im Uplink nicht perfekt synchron sind. Anschließend werden mathematische Optimierungsprobleme entwickelt, um die Ressourcenvergabe optimieren, die den Benutzerdurchsatz erheblich verbessern können.
Infolgedessen werden in der Arbeit zwei neue Ansätze zur schichtübergreifenden (cross-layer) Videoanpassung vorgestellt, die den vorgeschlagenen Ansatz zur Ressourcenvergabe übernehmen und auf Streamingsdienste mit geringer Latenz unter Verwendung von nichtskalierbare und skalierbare Videocodierung abzielen. Während die nichtskalierbare Videokodierung in der Branche weit verbreitet ist, dürfte die skalierbare Videokodierung in Zukunft stärker verbreitet sein. Diese beiden Technologien haben unterschiedliche Anpassungsprinzipien und erfordern daher unterschiedliche Lösungen, die speziell auf sie zugeschnitten sind. In beiden Fällen wird das Problem der Videoanpassung mit großer Zeitskala (von wenigen Sekunden) über eine Reihe von Problemen der Ressourcenvergabe in kleiner Zeitskala (jeweils in einem Bereich von wenigen Millisekunden) verfolgt. Auf diese Weise können die Videoanpassungsalgorithmen schnell auf die Variation des Funkkanals reagieren und die strengen Latenzanforderungen erfüllen. Bei der nichtskalierbare Videokodierung liegt ein weiterer Beitrag in der expliziten Berücksichtigung des potenziellen Durchsatzgewinns über effiziente Algorithmen der Ressourcenvergabe bei der Auswahl der Videoqualität
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
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
Author-wise bibliometric analysis based on entropy.
No full textAuthor-wise bibliometric analysis based on entropy.</p
Author Under Sail The Imagination of Jack London, 1893-1902
No full textIn Author Under Sail, Jay Williams offers the first complete literary biography of Jack London as a professional writer engaged in the labor of writing. It examines the authorial imagination in London's work, the use of imagination in both his fiction and nonfiction, and the ways he defined imagination in the creative process in his business dealings with his publishers, editors, and agents. In this first volume of a two-volume biography, Williams traverses the years 1893 to 1902, from London's "Story of a Typhoon" to The People of the Abyss. The Jack London who emerges in the pages of Author Under Sail is a writer whose partnership with publishers, most notably his productive alliance with George Brett of Macmillan, was one of the most formative in American literary history. London pioneered many author models during the heyday of realism and naturalism, blurring the boundaries of these popular genres by focusing on absorption and theatricality and the representation of the seen and unseen. London created an impassioned, sincere, and extremely personal realism unlike that of other American writers of the time. Author Under Sail is a literary tour de force that reveals the full range of London as writer, creative citizen, and entrepreneur at the same time it sheds light on the maverick side of machine-age literature.Intro -- Title Page -- Copyright Page -- Dedication -- Contents -- Acknowledgments -- Introduction -- 1. Spirit Truth -- 2. From Absorption to Theatricality and Back Again -- 3. "I Will Build a New Present" -- 4. Sons as Authors -- 5. Fathers as Publishers -- 6. The Daughter as Author -- 7. Lovers as Authors -- 8. At Sea with the Family -- 9. Yellow News, Yellow Stories -- 10. The Return Home -- Notes -- Bibliography -- Index -- About Jay WilliamsIn Author Under Sail, Jay Williams offers the first complete literary biography of Jack London as a professional writer engaged in the labor of writing. It examines the authorial imagination in London's work, the use of imagination in both his fiction and nonfiction, and the ways he defined imagination in the creative process in his business dealings with his publishers, editors, and agents. In this first volume of a two-volume biography, Williams traverses the years 1893 to 1902, from London's "Story of a Typhoon" to The People of the Abyss. The Jack London who emerges in the pages of Author Under Sail is a writer whose partnership with publishers, most notably his productive alliance with George Brett of Macmillan, was one of the most formative in American literary history. London pioneered many author models during the heyday of realism and naturalism, blurring the boundaries of these popular genres by focusing on absorption and theatricality and the representation of the seen and unseen. London created an impassioned, sincere, and extremely personal realism unlike that of other American writers of the time. Author Under Sail is a literary tour de force that reveals the full range of London as writer, creative citizen, and entrepreneur at the same time it sheds light on the maverick side of machine-age literature.Description based on publisher supplied metadata and other sources.Electronic reproduction. Ann Arbor, Michigan : ProQuest Ebook Central, YYYY. Available via World Wide Web. Access may be limited to ProQuest Ebook Central affiliated libraries
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