1,720,960 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
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
Entwurf des elektrischen Antriebssystems für eine hochfliegende Solarplattform
No full textDie Hochfliegende Unbemannte Plattform zählt mit einer institutsübergreifenden Beteiligung zu den Querschnittsprojekten des Deutschen Zentrum für Luft- und Raumfahrt. Ziel des Projekts ist der Test und die Demonstration von Systemen zur dauerhaften Beobachtung entlegener Regionen der Erde. Das zu der Familie der engl. High Altitude Pseudosatellite Platforms gehörende Fluggerät zielt auf eine dauerhafte Stationierung in Flughöhen von 15-22 km ab und soll dabei eine Nutzlast von 5 kg tragen können. Die für den Flug benötigte Energie soll ausschließlich aus Sonnenenergie mittels Solargeneratoren gewonnen werden. Ein wesentliches Teilsystem des Luftfahrzeuges ist der elektrische Flugantrieb. Dieser muss die
stark unterschiedlichen Leistungs- und Drehmomentanforderungen in unterschiedlichen Höhen zuverlässig erfüllen und dabei extremen Umwelteinflüssen, wie beispielsweise Temperaturen von bis zu -80 °C und sehr geringer Luftdichte widerstehen. Im Rahmen der vorliegenden Arbeit wird das elektrische Antriebssystem ausgelegt und in Betrieb genommen. Im Rahmen dieser Arbeit werden zunächst die Grundlagen elektrischer Flugantriebe eingeführt und grundlegende Zusammenhänge für die Auslegung eines Antriebssystems insbesondere im Kontext der hochfliegenden Plattformen dargestellt. Das zu entwickelnde Antriebssystem wird anschließend in das Gesamtsystem eingeordnet und die Systemanforderungen aus den übergeordneten Luftfahrzeuganforderungen abgeleitet. Ausgehend von der Anforderungsdefinition wird eine geeignete Systemarchitektur erarbeitet und zugehörige Systemzustände modelliert. Basierend hierauf werden geeignete Komponenten für das Antriebssystem ausgewählt und entwickelt. Anschließend wird ein entsprechender Regler für das System ausgelegt und auf die Zielhardware gebracht. Zum Abschluss der Arbeit wird das System im Rahmen von Gesamtsystemtests auf einen Teststand betrieben, um den Funktionsnachweis zu erbringen. Auf Basis der Ergebnisse wird ein Ausblick für Folgearbeiten gegeben
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
Sensorlose Regelung Permanentmagneterregter Synchronmotoren (PMSM)
No full textTo further exploit efficiency potentials and enhance safety and reliability of avionic components conventional hydraulic systems are being replaced by partly or fully electrical systems. The introduction of electromechanic actuators in modern flight control systems is of
special interest. The operation of electric drive units with corresponding power electronics
in safety critical applications yield in strict requirements for reliability and availability.
To fulfill these requirements apart from redundancy and fault tolerance techniques the
condition monitoring is a key technology to safely determine the components condition
prior failure. Together with a condition based maintenance the direct operating cost can
be drastically reduced compared to conventional preventive maintenance approaches.
To enable the exploration an test of condition monitoring systems the aim of this paper
is the development of a motor control electronic along with the implementation of the
corresponding control algorithms for the control of permanent magnet synchronous motors
Author-wise bibliometric analysis based on entropy.
No full textAuthor-wise bibliometric analysis based on entropy.</p
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