1,721,447 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
MINT.tools: Tools and Adaptors Supporting Acquisition, Annotation and Analysis of Multimodal Corpora
Full text linkKousidis S, Pfeiffer T, Schlangen D. MINT.tools: Tools and Adaptors Supporting Acquisition, Annotation and Analysis of Multimodal Corpora. In: Proceedings of Interspeech 2013. ISCA; 2013
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
Reconstruction and analysis of a sub-Plinian fall deposit from the Astroni volcano (ca. 4100-3800 BP) in the Campi Flegrei area, Italy
No full textA simple semi-analytical model presented in Pfeiffer et al. (in press) (“Hazmap”-modified version) was applied to reconstruct the tephra deposit of a Plinian or sub-Plinian phase (called Astroni 6, after Isaia et al., 2004) of an eruption of the Astroni volcano (ca. 4100-3800 BP) within the Campi Flegrei volcanic area in Italy.
In this model, the eruption column is assumed to act as a line source in order to neglect complex near/vent interactions. Therefore, the validity of the model is limited to the medium and far areas from the vent (beyond 10-20km), where the assumption of a line source can be justified. The distribution of the particles in the atmosphere is assumed to be only controlled by gravity, wind and eddy diffusion. The model accounts for two different types of particles (juvenile pumice and unspecified dense particles) within a used-defined range of granulometric classes.
The numerically calculated deposit was confronted with the observed deposit. Applying a least/squares method it was tried to optimize input variables such as distribution of particles and mass within the eruption column, wind and diffusion parameters by fitting the computed deposit with the observed one. A good correlation between the numerically calculated and the measured deposit could be achieved, although the quality of the input data is poor because of the lack of a sufficient number of distal sample points. Therefore, best fitting input parameters could not be well constrained and the presented results must be seen as a fairly rough estimate on eruption conditions only. IN particular, the erupted mass and eruption column height predicted by the model are considerably smaller than those presented by other authors (Isaia et al., 2004). However, the discrepancy is large enough to raise the question about the precision of other estimates as well.INGVUnpublishedope
Reconstruction and analysis of a sub-Plinian fall deposit from the Astroni volcano (ca. 4100-3800 BP) in the Campi Flegrei area, Italy
No full textA simple semi-analytical model presented in Pfeiffer et al. (in press) (“Hazmap”-modified version) was applied to reconstruct the tephra deposit of a Plinian or sub-Plinian phase (called Astroni 6, after Isaia et al., 2004) of an eruption of the Astroni volcano (ca. 4100-3800 BP) within the Campi Flegrei volcanic area in Italy.
In this model, the eruption column is assumed to act as a line source in order to neglect complex near/vent interactions. Therefore, the validity of the model is limited to the medium and far areas from the vent (beyond 10-20km), where the assumption of a line source can be justified. The distribution of the particles in the atmosphere is assumed to be only controlled by gravity, wind and eddy diffusion. The model accounts for two different types of particles (juvenile pumice and unspecified dense particles) within a used-defined range of granulometric classes.
The numerically calculated deposit was confronted with the observed deposit. Applying a least/squares method it was tried to optimize input variables such as distribution of particles and mass within the eruption column, wind and diffusion parameters by fitting the computed deposit with the observed one. A good correlation between the numerically calculated and the measured deposit could be achieved, although the quality of the input data is poor because of the lack of a sufficient number of distal sample points. Therefore, best fitting input parameters could not be well constrained and the presented results must be seen as a fairly rough estimate on eruption conditions only. IN particular, the erupted mass and eruption column height predicted by the model are considerably smaller than those presented by other authors (Isaia et al., 2004). However, the discrepancy is large enough to raise the question about the precision of other estimates as well.INGVUnpublishedope
A numerical reconstruction of fall deposits from the Agnano-Monte Spina (4100 BP) Plinian eruption in the Campi Flegrei area, Italy
No full textA simple semianalytical model was applied to simulate the tephra deposits produced by two Plinian phases called B1 and D1 of the Agnano-Monte Spina eruption (4100BP) within the Campli Flegrei volcanic area in Italy. In this model, the eruption column is assumed to act as a line source in order to neglect complex near/vent interactions. Therefore, the validity of the model is limited to the medium and far areas from the vent (beyond 10-20km), where the assumption of a line source can be justified. The distribution of the particles in the atmosphere is assumed to be only controlled by gravity, wind and eddy diffusion. The model accounts for particles of different types and (juvenile pumice or ash particles, lithic fragments and crystals) within a used-defined range of granulometric classes.
The numerically calculated deposit was confronted with the observed deposit. Applying a least/squares method it was tried to optimize input variables such as distribution of particles and mass within the eruption column, wind and diffusion parameters by fitting the computed deposit with the observed one. A good correlation between the numerically calculated and the measured deposit as well as a good agreement between the fitted variables with independently found parameters of the eruption could be achieved. The results allowed to re-estimate eruption parameters such as minimum erupted mass (2-3x1011 kg each), eruption column height (16-23 km for B1, ca. 30 km for D1), grain-size spectrum of erupted tephra, and the wind field at the time of the eruption.INGVUnpublishedope
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