1,720,959 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
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
Appropriate 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
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
koamabayili/VECTRON-author-checklist: VECTRON author checklist
No full textWe have done our best to complete the author checklist relating to the use of animals in the hut study. Note that the objective for the hut study was to evaluate the IRS treatment applications for residual efficacy against Anopheles mosquitoes, including the local An. coluzzii mosquito population. Cows were only used to attract mosquitoes into the huts and no tests were carried out directly on the cows. The author checklist is intended for use with studies where experiments are carried out on animals, which is why we have had such difficulty in completing this for the hut study, as many of the questions do not relate to how the cows were used
Novel fiber lasers as excitation sources for photoacoustic tomography and microscopy
No full textTwo custom fibre lasers have been developed. One is designed for widefield photoacoustic tomography (PAT) and uses a custom drawn large core diameter fibre (100μm) to provide high pulse energies (5mJ). It also provides a variable pulse repetition frequency (100Hz-400Hz) and pulse duration (10-150ns) and is compact (of comparable dimensions to a desktop PC) and does not require external water cooling. This system was used to acquire in vivo images of the subcutaneous microvasculature in the human palm. The second laser is designed for Optical Resolution Photoacoustic Microscopy (OR-PAM) and provides a high quality beam (M2<1.1), pulse energies >1μJ with a pulse repetition frequency (PRF) up to 2MHz, and a 532nm emission wavelength. The high PRF of this laser was exploited for ultra-fast image acquisition. The compact size and enhanced functionality of these lasers offers a major opportunity to facilitate the translation of photoacoustic imaging to practical applications in medicine and biology
Use of a pulsed fibre laser as an excitation source for photoacoustic tomography
No full textThe use of a pulsed fibre laser as an excitation source for photoacoustic tomography has been investigated. Fibre lasers have the advantage of being compact, robust and efficient compared to traditional excitation sources used for photoacoustic tomography (e.g. Q-switched Nd:YAG pumped OPO or dye systems). Their high pulse repetition frequencies and adjustable pulse duration, shape and duty cycle also enables a wide range of time and frequency domain excitation methods to be investigated. A 1060nm, 20W fibre laser was used to generate acoustic waves in a tissue mimicking phantom composed of blood filled tubes immersed in a 1% solution of intralipid (mu's=1mm-1) . The laser was then combined with a Fabry Perot photoacoustic imaging system to obtain 3D images of a tissue mimicking phantom and an in vivo image of the vasculature of the palm of a volunteer. This study has demonstrated that pulsed fibre lasers have potential application as an excitation source for photoacoustic imaging of superficial blood vessels.SPIE 7899 Progress in Biomedical Optics and ImagingSan Francisco, CA23-25 Ja
Author-wise bibliometric analysis based on entropy.
No full textAuthor-wise bibliometric analysis based on entropy.</p
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