1,721,370 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
Nanotechnology and Life: An Engineer's Perspective
No full textNanotechnology deals with the design, development, and manipulation of materials and devices with at least one dimension sized on a nanometer scale. It involves fields of science as diverse as surface science, organic chemistry, molecular biology, semiconductor physics, microfabrication, with a vast range of applications, such as in medicine, electronics, biomaterials, and energy production. Its ultimate goal is to be able to predictably design, construct, and control nanosystems, tailoring them to specified needs. This is the classical task of engineers, requiring a quantitative modeling of the problem of interest, detailed and accurate enough to make a reliable design possible. In the case of the applications to biology and medicine, living bodies are seen by nanotechnologists as the (essentially passive) environment in which the nanosystems perform their tasks. This modelization does not take into account the actual nature of living beings, which has been uncovered piece by piece in a long process, converging in the last 50 years to form a unified picture, which can be conveyed by a simple sentence: living organisms are hierarchically integrated sets of nanomachines. This may be clear to biologists, they lack reliable methodological and theoretical tools that allow the generalization of their findings into quantitative models, suited to a design procedure. Filling this gap would allow the engineering of biosystems at the nanometric scale, which has the potential of revolutionizing both nanotechnologies and biotechnologies. This article is an attempt to give an idea of this scenario from the engineering point of view, putting in perspective the problems and challenges, and giving an idea of the possible developments and their implications
New near-field sampling representation from samples on planar spirals
No full textA field interpolation series allows the use of a finite number of samples either on a bounded or unbounded observation line to evaluate the field on all measurement plane from samples on a spiral line. The choice of an appropriate planar spiral in finding the solution to this problem allows the representation of the field over all the plane, determination of the optimal parametrization and phase function on the spiral as well as the corresponding interpolation scheme, and evaluation of the field on all the plane from the field at points located on the spiral
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