1,721,006 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
Numerische Modelluntersuchung der Ramingbachmündung
No full textAnlässlich umfangreicher Hochwasserschutzmaßnahmen für die Stadt Steyr in Oberösterreich wird ein physikalischer Modellversuch der Ramingbachmündung im Bereich einer Flusskrümmung der Enns durchgeführt. Anhand eines Vergleichs mit einem zweidimensionalen numerischen Modell wird untersucht, ob das an und für sich dreidimensionale Problem der Kurvenüberhöhung der Wasserspiegellagen in Flusskrümmungen auch von einem solchen Modell mit ausreichender Genauigkeit beschrieben werden kann. Als Software kommt HYDRO_AS-2D zum Einsatz, das zur Berechnung der Fließverhältnisse die zweidimensionalen, tiefengemittelten Flachwassergleichungen mittels der finite Volumen Methode näherungsweise löst; das unstrukturierte Drei- und Vierecksnetz wird mit SMS erstellt. Weiters werden Möglichkeiten der Zusammenarbeit numerischer und physikalischer Modelle aufgezeigt, und eine ungekoppelte hybride Modellierung in die Praxis umgesetzt, wobei die numerische Simulation verschiedener Ausbauvarianten der Enns mit anschließender Vorauswahl hinsichtlich ihrer Eignung für eine weitergehende Überprüfung im physikalischen Modell vorgenommen wird. Als mögliche Hochwasserschutzmaßnahmen kommen für das Untersuchungsgebiet zur Absenkung des Hochwasserspiegels eine Unterwasserabsenkung, eine Kurvenaufweitung, eine Sohlabsenkung, eine Inselabtragung und Hochwasserschutzdämme und Buhnen in Frage. Das Ziel der hybriden Modellierung ist, den Umbau des physikalischen Modells möglichst effizient zu gestalten.In relation to proposed comprehensive flood protection measures for the city of Steyr in Upper Austria, a physical model experiment is conducted in the area of a bend of the river Enns including the mouth of the Ramingbach. In addition, a two-dimensional numerical simulation of the same investigation area was carried out in order to test the capability of the numerical model to simulate the three-dimensional flow processes in the river bend. The applied software is the model HYDRO_AS-2D, a two-dimensional depth-averaging finite volume model, and SMS for the creation of the computational mesh and visualisation of the results. Further, options of combined application of numerical and physical models are presented and a so called hybrid modelling is proposed for practical application. The main aim of this hybrid approach is to identify and evaluate several flood protection measures with respect to their effectiveness and suitability. Subsequently, this smaller set of options will be investigated by a physical model. Possible flood protection measures are: lowering of the water level downstream the investigation area, broadening of the river bed, lowering of the river bed, excavation of an island and flood protection dykes and groynes. The goal is to redesign the physical model as efficiently as possible.eingereicht von: Hepp GeroldWien, Univ. für Bodenkultur, Dipl.-Arb., 2010Zsfassung in engl. Sprach
Numerische Modelluntersuchung einer Flusskrümmung an der Enns: Hydrodynamisch-numerische Simulation einer hydraulisch komplexen Situation
No full textNumerische Modelluntersuchung der Ramingbachmündung
No full textAnlässlich umfangreicher Hochwasserschutzmaßnahmen für die Stadt Steyr in Oberösterreich wird ein physikalischer Modellversuch der Ramingbachmündung im Bereich einer Flusskrümmung der Enns durchgeführt. Anhand eines Vergleichs mit einem zweidimensionalen numerischen Modell wird untersucht, ob das an und für sich dreidimensionale Problem der Kurvenüberhöhung der Wasserspiegellagen in Flusskrümmungen auch von einem solchen Modell mit ausreichender Genauigkeit beschrieben werden kann. Als Software kommt HYDRO_AS-2D zum Einsatz, das zur Berechnung der Fließverhältnisse die zweidimensionalen, tiefengemittelten Flachwassergleichungen mittels der finite Volumen Methode näherungsweise löst; das unstrukturierte Drei- und Vierecksnetz wird mit SMS erstellt. Weiters werden Möglichkeiten der Zusammenarbeit numerischer und physikalischer Modelle aufgezeigt, und eine ungekoppelte hybride Modellierung in die Praxis umgesetzt, wobei die numerische Simulation verschiedener Ausbauvarianten der Enns mit anschließender Vorauswahl hinsichtlich ihrer Eignung für eine weitergehende Überprüfung im physikalischen Modell vorgenommen wird. Als mögliche Hochwasserschutzmaßnahmen kommen für das Untersuchungsgebiet zur Absenkung des Hochwasserspiegels eine Unterwasserabsenkung, eine Kurvenaufweitung, eine Sohlabsenkung, eine Inselabtragung und Hochwasserschutzdämme und Buhnen in Frage. Das Ziel der hybriden Modellierung ist, den Umbau des physikalischen Modells möglichst effizient zu gestalten.In relation to proposed comprehensive flood protection measures for the city of Steyr in Upper Austria, a physical model experiment is conducted in the area of a bend of the river Enns including the mouth of the Ramingbach. In addition, a two-dimensional numerical simulation of the same investigation area was carried out in order to test the capability of the numerical model to simulate the three-dimensional flow processes in the river bend. The applied software is the model HYDRO_AS-2D, a two-dimensional depth-averaging finite volume model, and SMS for the creation of the computational mesh and visualisation of the results. Further, options of combined application of numerical and physical models are presented and a so called hybrid modelling is proposed for practical application. The main aim of this hybrid approach is to identify and evaluate several flood protection measures with respect to their effectiveness and suitability. Subsequently, this smaller set of options will be investigated by a physical model. Possible flood protection measures are: lowering of the water level downstream the investigation area, broadening of the river bed, lowering of the river bed, excavation of an island and flood protection dykes and groynes. The goal is to redesign the physical model as efficiently as possible.eingereicht von: Hepp GeroldWien, Univ. für Bodenkultur, Dipl.-Arb., 2010Zsfassung in engl. Sprach
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