1,720,997 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
Transtubular Resection of Spinal Intradural Lésions : Techniques, Results, & Complications.
No full textLe travail de thèse ici présenté a été publié sous forme d’un article scientifique ayant le titre « Image guided tailored access resection (IMTAR) of spinal intradural tumors. Technical report of 13 cases »
L’article présente les résultats de la chirurgie per « accès minime » (MAS) utilisée dans notre établissement hospitalier avec une implémentation de la technique guidée par image que nous appelons « technique de navigation chirurgicale guidée par fusion d’image » (en anglais : Image Merge Tailored Access Resection ou IMTAR). IMTAR représente l’application d’une technique de fusion d’image déjà existante pour la chirurgie crânienne qui consiste à fusionner les images de la résonance magnétique préopératoire avec les images de fluoroscopie 3D obtenues pendant la chirurgie pour naviguer à la fois les structures osseuses et les tissus mous. La fusion d’image donne au chirurgien la possibilité de mieux planifier l’accès chirurgical par la navigation virtuelle sur les images avant l’incision. Le chirurgien peut donc adapter l’abord chirurgical selon la localisation de la lésion et également adapter la résection d’os en fonction de la fenêtre d’exposition nécessaire pour la visualisation de la lésion tumorale. Le choix d’utiliser la technique IMTAR est pris en préopératoire par le chirurgien en fonction de la disponibilité de cette technique dans un contexte de chirurgie élective. La technique est une implémentation d’une technique déjà existante et bien validée par la littérature courante dont l’utilisation est faite au niveau crânien, mais ici adaptée à la chirurgie spinale.
L’utilisation de la technique IMTAR a pour but de réduire le risque d’erreur de niveau de la localisation des lésions tumorales spinales, situation décrite en littérature. De plus, le choix de trajectoire d’accès trans-musculaire selon la localisation de la lésion tumorale pourrait améliorer l’angle d’accès aux lésions et minimiser le volume d’os enlevé pendant l’abord chirurgical.
Sur la série préliminaire de 13 patients dont les résultats sont contenus dans l’article ici joint, la technique IMTAR a montré des résultats d’exérèse tumorale superposables aux résultats de la technique MAS non-naviguée. La procédure IMTAR semble être moins invasive en termes de résection osseuse et elle permet une meilleure localisation de la lésion.
Le présent travail de thèse s’est déroulé dans le contexte de l’étude IMTAR, catégorie A (Protocole n. 172/15) approuvé par le CER VD et en cours depuis 01.01.2017 au CHUV de Lausanne (investigateurs principales: Dr Rodolfo Maduri, Dr John Michael Duff).
Les perspectives futures pour cette étude sont de décrire les résultats chirurgicaux sur une « prospective cohort » de patients ayant bénéficié de la technique IMTAR et de la technique MAS non-naviguée jusqu’à la date de fin de l’étude.
L’étude IMTAR a pour but d’évaluer les résultats de l’utilisation de la technique IMTAR pour les tumeurs spinales par rapport à la technique de chirurgie MAS classique en termes de minimisation de la morbidité associée à l’abord chirurgical, de la réduction du risque d’une instabilité spinale iatrogène et de l’optimisation de l’efficacité de la résection de la tumeur.
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- OBJECTIVE: Standard translaminar approaches for intradural extramedullary (IDEM) tumors require extensive soft tissue dissection and partial facet removal. Ventral lesions may necessitate wider bone resection with sub- sequent possible spinal instability. Any manipulation of an already compromised spinal cord may lead to neurological injury. We describe an image-guided minimal access technique for IDEM tumor resection.
- METHODS: Retrospective chart review of 13 consecutive patients after institutional ethics committee approval. We superimpose preoperative magnetic resonance imaging data with intraoperative 3-dimensional fluoroscopic im- ages, allowing to simultaneously visualize osseous anat- omy and the soft tissue lesion using appropriate windowing. We then plan optimal angle of trajectory to the tumor, which defines the skin incision and the trans- muscular trajectory. A tubular retractor is placed to span the tumor. Microsurgical tumor resection is then carried out using this angle of approach.
- RESULTS: Thirteen patients (mean age. 57 years; male-to- female ratio, 10:3) were operated on during 28 months. Gross total resection was achieved in all patients. Neuro- logical improvement occurred in 12 of the 13 patients. There was no neurological deficit outside of the expected sensory loss due to intentional nerve root sacrifice. No mechanical pain nor tumor recurrence were noted during the follow-up (mean, 16 months; range, 2e30 months).
- CONCLUSIONS: Image merge tailored access resection appears to be at least equivalent in terms of tumor resec- tion, blood loss, and complications to other tubular tech- niques. It may reduce risks of neurological deficit and spine instability. Image merge tailored access resection is a novel application of merging intraoperative fluoroscopic images with preoperative magnetic resonance images for tailored IDEM resection
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
Measuring the Impact of Delayed Cerebral Ischemia on Neuropsychological Outcome After Aneurysmal Subarachnoid Hemorrhage—Protocol of a Swiss Nationwide Observational Study (MoCA–DCI Study)
No full textkoamabayili/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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