1,720,978 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
Strömungsanalyse des Seitenleitwerkeseines BWB-Modells mit Hilfe des CFD-Programmes „XFlow“
Get PDFDie HAW (Hochschule für angewandte Wissenschaften) Hamburg forscht an einer
Nurflügler-Konfiguration als Antwort auf die Herausforderungen des Wachstums in
der Luftfahrt.
Hierfür ist ein Prototyp eines manntragenden Nurflüglers in Planung, um dessen
Flugeigenschaften zu analysieren.
In dieser Bachelorarbeit sollen erste Strömungsanalysen der aerodynamischen Eigenschaften
dieses Prototyps erstellt werden, um erste Eindrücke für die Auslegung
zu gewinnen.
Der Schwerpunkt der Arbeit liegt auf der Optimierung des Seitenleitwerkes in Bezug
auf Widerstand und Effektivität
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
Entwicklung eines Werkzeugs zur ökologisch-ökonomischen Bewertung von luftfahrtspezifischen Fertigungsprozessen und Integration in eine grafische Prozessvisualisierung
No full textAppropriate 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
Model-based development of a diagnostic and condition monitoring methodology onexample of a PEM fuel cell system
Get PDFGegenstand dieser Arbeit ist das Entwickeln einer Diagnose- und Zustandsüberwachungsmethodik
am Beispiel eines PEM-Brennstoffzellensystems. Teil dieser Arbeit
besteht in der Entwicklung einer Reihe von Fehlersequenzen, die die Funktionseinheiten
in ihrer Funktionalität beeinträchtigen. Dabei sollten diese induzierten Fehler vom System
erkannt, identifiziert und bewertet werden. Das System sollte in der Lage sein auf die
Fehler zu reagieren und gezielt Gegenmaßnahmen einzuleiten, um die intendierten
Funktionen des Systems zu erhalten.The subject of this thesis is to develop a diagnostic and condition monitoring methodology
using the example of a PEM fuel cell system. Part of this work is to develop a series of
error sequences that affect the function units in their functionality. In this case, these
injected errors should be detected, identified and evaluated by the system. The system
should be able to respond to the error and initiate targeted countermeasures to obtain the
intended functions of the system
Reparaturprozess eines Winglets: Problemvisualisierung mittels Virtual Reality
Get PDFIn der Luftfahrtbranche stellen effiziente und zuverlässige Maintenance-, Repair- and Overhaul-Prozesse einen essenziellen Bestandteil des sicheren Flugbetriebs dar. Insbesondere bei der Reparatur komplexer Faserverbundbauteile wie Winglets treten in der Praxis häufig Ineffizienzen auf, etwa durch verschiedene Dokumentationsformen oder durch viele zu treffende Absprachen vieler beteiligter Akteure. Ziel dieser Arbeit war es, eine Virtual-Reality-Anwendung zu entwickeln, welche exemplarisch zwei zentrale Problemfelder im Reparaturprozess einesWinglets visualisiert. Durch eine immersive, interaktive Darstellung sollen Nutzer ein besseres Verständnis für Prozessineffizienzen erlangen. Die Anwendung wurde mit der Open-Source-Game-Engine Godot realisiert und anschließend mithilfe qualitativer und quantitativer Methoden evaluiert. Die Ergebnisse zeigen, dass VR ein geeignetes Werkzeug zur Vermittlung komplexer Prozessstrukturen sein kann und insbesondere in der Schulung und Sensibilisierung von Personal Potenzial bietet. Abschließend werden Verbesserungsvorschläge sowie mögliche Einsatzszenarien in der industriellen Praxis diskutiert.In aviation industry, efficient and reliable maintenance, repair and overhaul processes are an essential part of safe flight operations. Especially when repairing complex composite components such as winglets, inefficiencies often occur in practice, for example due to different forms of documentation or many agreements to be made by many actors involved. The aim of this work was to develop a virtual reality application that visualizes two central problem areas in the repair process of a winglet as example. Through an immersive, interactive presentation, users should gain a better understanding of process inefficiencies. The application was realized with the open source game engine Godot and subsequently evaluated using qualitative and quantitative methods. The results show that VR can be a suitable tool for communicating complex process structures and offers potential, particularly in the training and sensitization of personnel. Finally, suggestions
for improvement and possible application scenarios in industrial practice are discussed
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
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