1,721,817 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
Oceanic crust and Moho of the Pacific Plate in the eastern Ogasawara Plateau region
No full textTo show the structure of oceanic crust and Moho around the eastern Ogasawara
Plateau, we have analyzed industry-standard two-dimensional multichannel seismic reflection
data. To obtain improved velocity models, phase information of seismic signals was
used for velocity analysis and velocity models for oceanic crust above Moho were determined.
We apply this velocity analysis technique to seismic reflection data around the
eastern Ogasawara Plateau, with the result of clear images of structures within oceanic
crust and Moho. South of the Ogasawara Plateau, Moho deepens proximal to the Plateau.
Moho distal to the Plateau is ca 7 km below sea floor (bsf), whereas it is ca 10 km bsf near
the Plateau. The characters of oceanic crust and Moho differ significantly north and south
of the Plateau. To the north, the structure of oceanic crust is ambiguous, the sea floor is
shallower and less smooth, and Moho is discontinuous. To the south, structures within
oceanic crust and Moho are imaged clearly, and the sea floor is deeper. A strong Moho
reflection south of the Plateau might represent a sharp boundary between layered gabbro
and peridotite. However, discontinuous Moho reflections north of the Plateau might represent
rough topography because of intensive magmatism or a gradual downward increase
in velocity within a thick Moho transition zone. A fracture zone north of the Plateau also
appears to separate oceanic crust and Moho of different characters, suggesting vigorous
magmatism between the Plateau and the fracture zone, and that the Ogasawara Plateau
and the fracture zone influenced the genesis of oceanic crust and upper mantle. Differences
in acoustic characteristics to the north and south of the Plateau are apparent in profiles
illuminated by seismic attributes
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
Bio-mimetic trajectory generation using a neural time-base generator
No full textThis paper presents a neural time-base generator (TBG) that can generate a family of neural control signals with a controllable finite duration and bell-shaped velocity profile. Then, a bio-mimetic trajectory generation method using the neural TBG model is explained. Using the proposed model, the generation ability of human-like trajectories is examined through comparisons between computer simulations and human arm trajectories during reaching movements according to the curvature of constrained trajectories
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
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