1,721,010 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
Intégration de la respiration en radiothérapie: Apport du recalage déformable d'images
No full textA major challenge in lung cancer treatment in radiotherapy is to take into account organs movements and deformations in order to improve dose coverage of the tumor and spare the surrounding healthy tissues. We focused on intensity based deformable registration methods applied to 3D computed tomography scans (3D-CT) of the thorax. The goal is to extract movement and deformation information of lungs and tumor. During this PhD we developed a deformable registration platform with multiples regularizations techniques of vector fields. We did three main studies. In the first one we used deformable registration to study the breath-hold reproducibility with ABC device. The breath-hold was efficient for patients with normal lung behavior and inefficient for patients with lung discrepancies. In the second study, we used 4D-CT acquisitions (a 4D-CT acquisition is a set of 3D-CT images acquired over the free-breathing respiration cycle). The goal was to extract and follow thorax movements for a free-breathing treatment and 4D dosimetric studies. We built a first 4D-CT image model with two 3D-CT images acquired at end-inhale and end-exhale stages of the respiration cycle. The long-term goal is to have a complete model of lung and thorax, allowing tumor tracking and respiration synchronized irradiation, in order to optimize the lung cancer treatment in radiotherapy.Prendre en compte les mouvements et les déformations des organes en radiothérapie pour le traitement de cancer de poumons est un défi majeur car cela permet d'augmenter la dose délivrée à la tumeur tout en épargnant mieux les tissus sains environnants. Nous nous intéressons aux méthodes iconiques de recalage non-rigide (ou déformable) appliquées aux acquisitions tomodensiométriques 3D (TDM 3D) du thorax. Le but est d'extraire l'information mouvement et déformation des poumons et des tumeurs. Durant cette thèse nous avons développé une plateforme de recalage déformable avec plusieurs méthodes de régularisation de champs de vecteurs. Trois études principales ont été menées. Dans une première étude, le recalage déformable a permis de contrôler la reproductibilité du blocage respiratoire. Nous avons montré sur une dizaine de patients que ce blocage est efficace sauf pour trois patients avec des anomalies fonctionnelles. Dans une deuxième étude nous analysons des acquisitions TDM 4D (ensemble d'images TDM 3D acquises à des instants différents du cycle respiratoire normal). Le but est d'extraire et suivre les mouvements et déformations du thorax pour en tenir compte lors d'un traitement en respiration libre et d'effectuer des études dosimétriques dynamiques 4D. Nous avons construit un premier modèle d'image TDM 4D à partir des deux images TDM 3D acquises en blocage respiratoire en fin d'expiration et en fin d'inspiration. L'objectif à long terme est de pouvoir fournir une modélisation détaillée du poumon, permettant le suivi de la tumeur et l'irradiation synchronisée avec la respiration, afin d'optimiser le traitement curatif par radiothérapie du cancer du poumon
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
Intégration de la respiration en radiothérapie: Apport du recalage déformable d'images
No full textA major challenge in lung cancer treatment in radiotherapy is to take into account organs movements and deformations in order to improve dose coverage of the tumor and spare the surrounding healthy tissues. We focused on intensity based deformable registration methods applied to 3D computed tomography scans (3D-CT) of the thorax. The goal is to extract movement and deformation information of lungs and tumor. During this PhD we developed a deformable registration platform with multiples regularizations techniques of vector fields. We did three main studies. In the first one we used deformable registration to study the breath-hold reproducibility with ABC device. The breath-hold was efficient for patients with normal lung behavior and inefficient for patients with lung discrepancies. In the second study, we used 4D-CT acquisitions (a 4D-CT acquisition is a set of 3D-CT images acquired over the free-breathing respiration cycle). The goal was to extract and follow thorax movements for a free-breathing treatment and 4D dosimetric studies. We built a first 4D-CT image model with two 3D-CT images acquired at end-inhale and end-exhale stages of the respiration cycle. The long-term goal is to have a complete model of lung and thorax, allowing tumor tracking and respiration synchronized irradiation, in order to optimize the lung cancer treatment in radiotherapy.Prendre en compte les mouvements et les déformations des organes en radiothérapie pour le traitement de cancer de poumons est un défi majeur car cela permet d'augmenter la dose délivrée à la tumeur tout en épargnant mieux les tissus sains environnants. Nous nous intéressons aux méthodes iconiques de recalage non-rigide (ou déformable) appliquées aux acquisitions tomodensiométriques 3D (TDM 3D) du thorax. Le but est d'extraire l'information mouvement et déformation des poumons et des tumeurs. Durant cette thèse nous avons développé une plateforme de recalage déformable avec plusieurs méthodes de régularisation de champs de vecteurs. Trois études principales ont été menées. Dans une première étude, le recalage déformable a permis de contrôler la reproductibilité du blocage respiratoire. Nous avons montré sur une dizaine de patients que ce blocage est efficace sauf pour trois patients avec des anomalies fonctionnelles. Dans une deuxième étude nous analysons des acquisitions TDM 4D (ensemble d'images TDM 3D acquises à des instants différents du cycle respiratoire normal). Le but est d'extraire et suivre les mouvements et déformations du thorax pour en tenir compte lors d'un traitement en respiration libre et d'effectuer des études dosimétriques dynamiques 4D. Nous avons construit un premier modèle d'image TDM 4D à partir des deux images TDM 3D acquises en blocage respiratoire en fin d'expiration et en fin d'inspiration. L'objectif à long terme est de pouvoir fournir une modélisation détaillée du poumon, permettant le suivi de la tumeur et l'irradiation synchronisée avec la respiration, afin d'optimiser le traitement curatif par radiothérapie du cancer du poumon
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
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