1,721,012 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
Desarrollo de herramientas bioinformáticas para el estudio y clasificación de proteínas usando coevolución
Full text linkMultiple sequence alignments (MSA) provide us with at least two types of information;\none is given by the conservation of amino acids at certain position, while the other is given by\nthe relationship or coevolution between two or more positions. This coevolution between sites\nis inferred using methods that estimate covariation from a MSA. In this thesis, a public webserver\ncapable of calculating covariation between residues in a protein family was developed.\nMore importantly, an interactive visualization framework is available to explore the results in\nterms of sequence conservation, covariation integrated with the protein 3D structure.\nCoevolution can also be detected at protein interfaces, where proteins need to maintain\ncertain interactions throughout their evolution. Until now, such analysis was restricted to bacterial\ngenomes sequences only and to expert users capable of building their own concatenated\nMSA suitable for this calculations. The I-COMS tools was developed to extend the analysis\nto any species as well as facilitate non expert users the calculation and interpretation of the\nobtained results. Finally, the extent of the covariation relationship across diferent protein\nfamilies was studied to assess the network topology similarity between related functional domains.\nThis study provides the foundation to the development of new methods that aim at\nclustering and classifying proteins in families.Fil: Simonetti, Franco Lucio. Universidad de Buenos Aires. Facultad de Farmacia y Bioquímica. Buenos Aires, ArgentinaLos alineamientos múltiples de secuencias (MSA) contienen al menos dos tipos de información; una está dada por la conservación de aminoácidos en ciertas posiciones, mientras que\nla otra habla sobre la interrelación o coevolución entre dos o más posiciones. La coevolución\nentre sitios se inére utilizando métodos estadísticos que estiman la covariación entre posiciones\na partir de un MSA. En esta tesis, se desarrolló web de acceso libre y gratuito que\npermite a usuarios no expertos calcular covariación en familias de proteínas. Los resultados se\npresentan en una interfaz interactiva que permite explorar la red de covariación e integrarla\ncon la estructura 3D de la proteína.\nLa coevolución entre sitios también puede ser detectada en la interfaz de contacto de dos\nproteínas que interactúan y han requerido mantener esta interacción durante su evolución.\nHasta ahora, este tipo de análisis estaba restringido a secuencias de genomas bacterianos y se\nrequerían conocimientos avanzados para la generación de un MSA concatenado adecuado para\neste tipo de cálculo. La herramienta I-COMS fue desarrollada con esto en mente, y facilitar a\nlos usuarios este tipo de análisis, extender el rango de aplicabilidad y analizar los resultados\nde manera gráfica.\nPor último, se estudió cuál es el alcance de la información capturada en la topología de\nlas redes de covariación para detectar familias de proteínas relacionadas. Este estudio sienta\nlas bases para el desarrollo de nuevos métodos para agrupar y clasificar proteínas en familias.Ciencias BioquímicasDoctor de la Universidad de Buenos Aires en Farmacia y Bioquímic
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
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
Author-wise bibliometric analysis based on entropy.
No full textAuthor-wise bibliometric analysis based on entropy.</p
Peribulbar anesthesia for strabismus surgery in adult patients
No full textPURPOSE: To evaluate the efficacy and safety of peribulbar anesthesia during strabismus surgery.METHODS: Medical records of patients undergoing strabismus surgery and peribulbar anesthesia were reviewed. The overall efficacy of peribulbar anesthesia was evaluated as requirement of supplemental peribulbar anesthesia, impossibility to perform eye muscles surgery due to inadequate efficacy of the block and peribulbar block complications that occurred up to 6weeks postoperatively. Presence of oculocardiac reflex (OCR) and presence of decreased visual acuity and afferent pupillary defect postoperatively were reported.RESULTS: A total of 510 patients comprised our study group. The total amount of peribulbar injections was 717. Four patients (0.7%) required supplemental injection in the superonasal quadrant. Five of 510 (0.9%) required an anesthesiologic intervention with intravenous atropine. Eighty patients of 510 (15.6%) complained about transitory complete ptosis and/or amaurosis postoperatively. No complications were observed up to 6weeks postoperatively.CONCLUSION: Peribulbar anesthesia was an effective and safe option during strabismus surgery in adult patients
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