1,721,026 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
Helminth Parasites in Ruminants of Yellowstone National Park and Brucellosis Coinfection
No full textYellowstone National Park is a protected ecosystem surrounded by cattle ranches. Wildlife
interactions create management challenges for cattle ranchers and the National Park Service. To
quantify and characterize helminth infections of wildlife, I collected fecal samples of bison and
elk in Yellowstone National Park. I analyzed the samples using a McMasters Egg Counting
Technique to calculate the egg count per gram of fecal material for each individual. The results
indicated that changes in herd size resulted in significant differences in infection rates for bison,
while sex differences and age changes resulted in significant results for elk. These results match
existing literature regarding disease transmission and helminth infection characteristics. The
paper concludes with a Global Health Chapter responding to the challenge of managing
brucellosis and the implications that helminth coinfection has on the spread of the bacteria. There
are both concerns for human health and for livestock as brucellosis is a common zoonotic disease
that is especially damaging in low-income countries. Managing the wildlife reservoirs that
transmit diseases to domestic cattle can have a large impact on transmission. I explore how
brucellosis and gastrointestinal helminths interactions reveal methods of indirect management as
a way to decrease transmission
A Comprehensive Analysis of the HIV/AIDS Epidemic and the Transmission Dynamics of HIV in the Three Largest Cities of Texas
No full textSpatiotemporal Comparisons of Panamanian P. volitans Diet and Parasitism: Continued Enemy Release and Implications
No full textThere exists a range of gaps in the current literature surrounding the study of invasive Indo-Pacific lionfish, Pterois volitans, in their novel environments. These hardy predators have successfully conquered marine ecosystems across the Atlantic Ocean and Caribbean Sea, outcompeting native predators and consuming native prey. Not much is known about the factors that facilitate and accompany this rapid invasion, such as new trophic dynamics or introduced species interactions. One interaction in particular, that between predator and parasite, is paramount in mediating predator populations on top of the conventional trophic pyramid. Invasive species, however, are known to escape parasitism for indefinite time scales. The colonization time theory predicts that species will accumulate parasites with time that has passed since their introduction. This paper seeks to explore the parasitic loads of P. volitans with a specific focus on the Panama region, where lionfish were first sighted in 2009. In this work, a 2022 assessment of lionfish parasite abundance, impact, and diet composition is compared to past studies in order to update our understanding of invasive lionfish in Panama
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