1,720,962 research outputs found
Phantom study for comparison between computed tomography- and C-Arm computed tomography-guided puncture applied by residents in radiology
No full textPurpose Comparison of puncture deviation and puncture duration between computed tomography (CT)- and C-arm CT (CACT)-guided puncture performed by residents in training (RiT). Methods In a cohort of 25 RiTs enrolled in a research training program either CT- or CACT-guided puncture was performed on a phantom. Prior to the experiments, the RiT’s level of training, experience playing a musical instrument, video games, and ball sports, and self-assessed manual skills and spatial skills were recorded. Each RiT performed two punctures. The first puncture was performed with a transaxial or single angulated needle path and the second with a single or double angulated needle path. Puncture deviation and puncture duration were compared between the procedures and were correlated with the self-assessments. Results RiTs in both the CT guidance and CACT guidance groups did not differ with respect to radiologic experience (p = 1), angiographic experience (p = 0.415), and number of ultrasound-guided puncture procedures (p = 0.483), CT-guided puncture procedures (p = 0.934), and CACT-guided puncture procedures (p = 0.466). The puncture duration was significantly longer with CT guidance (without navigation tool) than with CACT guidance with navigation software (p < 0.001). There was no significant difference in the puncture duration between the first and second puncture using CT guidance (p = 0.719). However, in the case of CACT, the second puncture was significantly faster (p = 0.006). Puncture deviations were not different between CT-guided and CACT-guided puncture (p = 0.337) and between the first and second puncture of CT-guided and CACT-guided puncture (CT: p = 0.130; CACT: p = 0.391). The self-assessment of manual skills did not correlate with puncture deviation (p = 0.059) and puncture duration (p = 0.158). The self-assessed spatial skills correlated positively with puncture deviation (p = 0.011) but not with puncture duration (p = 0.541). Conclusion The RiTs achieved a puncture deviation that was clinically adequate with respect to their level of training and did not differ between CT-guided and CACT-guided puncture. The puncture duration was shorter when using CACT. CACT guidance with navigation software support has a potentially steeper learning curve. Spatial skills might accelerate the learning of image-guided puncture. Key Points: Citation FormatZiel Vergleich der Punktionsabweichung und -dauer zwischen Computertomografie (CT) – und C-Arm-CT (CACT) -gesteuertem Punktionsverfahren bei Anwendung durch Assistenzärzte in Weiterbildung (AiW). Material und Methode In einer Kohorte von 25 AiW, die Teil einer wissenschaftlichen Förderung waren, wurden entweder CT- oder CACT-gesteuerte Punktionen an einem Phantom durchgeführt. Vor Beginn wurden der Weiterbildungsstand, die Erfahrung mit Spielen eines Musikinstruments, mit Videospielen und mit Ballsportarten und die Selbsteinschätzung von manueller Geschicklichkeit und räumlichem Denkvermögen abgefragt. Jede/r AiW führte 2 Punktionen durch, wobei die 1. Punktion mit einem transaxialen bzw. einfach angulierten Nadelpfad und die 2. Punktion mit einem einfach bzw. doppelt angulierten Nadelpfad erfolgte. Punktionsabweichung und -dauer wurden zwischen den Verfahren verglichen und mit den Selbsteinschätzungen korreliert. Ergebnisse Die beiden Gruppen der AiW zeigten keine Unterschiede in der Erfahrung in der Radiologie (p = 1), in der Angiografie (p = 0.415) und in der Anzahl bereits durchgeführter Punktionen gesteuert durch Ultraschall (p = 0,483), CT (p = 0,934) und CACT (p = 0,466). In der CT (ohne Navigationssoftware) war die Punktionsdauer signifikant länger als mit der CACT-Bildsteuerung mit Navigationssoftware (p < 0,001). Bei der Punktionsdauer zeigten sich keine signifikanten Unterschiede zwischen der 1. und 2. Punktion im CT (p = 0,719), während die 2. Punktion mit CACT schneller durchgeführt werden konnte (p = 0,006). Die Punktionsabweichung war weder signifikant zwischen CT- und CACT-Bildsteuerung (p = 0,337), noch zwischen der 1. und 2. Punktion der jeweiligen Verfahren (CT: p = 0,130; CACT: p = 0,391). Die Selbsteinschätzung der manuellen Geschicklichkeit korrelierte nicht mit der Punktionsabweichung (p = 0,059) und -dauer (p = 0,158). Das subjektive räumliche Denkvermögen zeigte eine moderate positive Korrelation zur Punktionsabweichung (p = 0,011), aber nicht zur -dauer (p = 0,541). Schlussfolgerung Die AiW erreichten eine dem Ausbildungsstand entsprechende, klinisch adäquate Punktionsabweichung unter CT- und CACT-Bildsteuerung. Die CACT-gesteuerten Punktionen mit Unterstützung durch Navigationssoftware wurden schneller durchgeführt, und auch die Lernkurve war mit CACT-Bildsteuerung steiler. Räumliches Denkvermögen kann möglicherweise das Erlernen bildgesteuerter Punktionen beschleunigen. Kernaussagen: ZitierweisePurpose Comparison of puncture deviation and puncture duration between computed tomography (CT)- and C-arm CT (CACT)-guided puncture performed by residents in training (RiT). Methods In a cohort of 25 RiTs enrolled in a research training program either CT- or CACT-guided puncture was performed on a phantom. Prior to the experiments, the RiT’s level of training, experience playing a musical instrument, video games, and ball sports, and self-assessed manual skills and spatial skills were recorded. Each RiT performed two punctures. The first puncture was performed with a transaxial or single angulated needle path and the second with a single or double angulated needle path. Puncture deviation and puncture duration were compared between the procedures and were correlated with the self-assessments. Results RiTs in both the CT guidance and CACT guidance groups did not differ with respect to radiologic experience (p = 1), angiographic experience (p = 0.415), and number of ultrasound-guided puncture procedures (p = 0.483), CT-guided puncture procedures (p = 0.934), and CACT-guided puncture procedures (p = 0.466). The puncture duration was significantly longer with CT guidance (without navigation tool) than with CACT guidance with navigation software (p < 0.001). There was no significant difference in the puncture duration between the first and second puncture using CT guidance (p = 0.719). However, in the case of CACT, the second puncture was significantly faster (p = 0.006). Puncture deviations were not different between CT-guided and CACT-guided puncture (p = 0.337) and between the first and second puncture of CT-guided and CACT-guided puncture (CT: p = 0.130; CACT: p = 0.391). The self-assessment of manual skills did not correlate with puncture deviation (p = 0.059) and puncture duration (p = 0.158). The self-assessed spatial skills correlated positively with puncture deviation (p = 0.011) but not with puncture duration (p = 0.541). Conclusion The RiTs achieved a puncture deviation that was clinically adequate with respect to their level of training and did not differ between CT-guided and CACT-guided puncture. The puncture duration was shorter when using CACT. CACT guidance with navigation software support has a potentially steeper learning curve. Spatial skills might accelerate the learning of image-guided puncture. Key Points: Citation FormatZiel Vergleich der Punktionsabweichung und -dauer zwischen Computertomografie (CT) – und C-Arm-CT (CACT) -gesteuertem Punktionsverfahren bei Anwendung durch Assistenzärzte in Weiterbildung (AiW). Material und Methode In einer Kohorte von 25 AiW, die Teil einer wissenschaftlichen Förderung waren, wurden entweder CT- oder CACT-gesteuerte Punktionen an einem Phantom durchgeführt. Vor Beginn wurden der Weiterbildungsstand, die Erfahrung mit Spielen eines Musikinstruments, mit Videospielen und mit Ballsportarten und die Selbsteinschätzung von manueller Geschicklichkeit und räumlichem Denkvermögen abgefragt. Jede/r AiW führte 2 Punktionen durch, wobei die 1. Punktion mit einem transaxialen bzw. einfach angulierten Nadelpfad und die 2. Punktion mit einem einfach bzw. doppelt angulierten Nadelpfad erfolgte. Punktionsabweichung und -dauer wurden zwischen den Verfahren verglichen und mit den Selbsteinschätzungen korreliert. Ergebnisse Die beiden Gruppen der AiW zeigten keine Unterschiede in der Erfahrung in der Radiologie (p = 1), in der Angiografie (p = 0.415) und in der Anzahl bereits durchgeführter Punktionen gesteuert durch Ultraschall (p = 0,483), CT (p = 0,934) und CACT (p = 0,466). In der CT (ohne Navigationssoftware) war die Punktionsdauer signifikant länger als mit der CACT-Bildsteuerung mit Navigationssoftware (p < 0,001). Bei der Punktionsdauer zeigten sich keine signifikanten Unterschiede zwischen der 1. und 2. Punktion im CT (p = 0,719), während die 2. Punktion mit CACT schneller durchgeführt werden konnte (p = 0,006). Die Punktionsabweichung war weder signifikant zwischen CT- und CACT-Bildsteuerung (p = 0,337), noch zwischen der 1. und 2. Punktion der jeweiligen Verfahren (CT: p = 0,130; CACT: p = 0,391). Die Selbsteinschätzung der manuellen Geschicklichkeit korrelierte nicht mit der Punktionsabweichung (p = 0,059) und -dauer (p = 0,158). Das subjektive räumliche Denkvermögen zeigte eine moderate positive Korrelation zur Punktionsabweichung (p = 0,011), aber nicht zur -dauer (p = 0,541). Schlussfolgerung Die AiW erreichten eine dem Ausbildungsstand entsprechende, klinisch adäquate Punktionsabweichung unter CT- und CACT-Bildsteuerung. Die CACT-gesteuerten Punktionen mit Unterstützung durch Navigationssoftware wurden schneller durchgeführt, und auch die Lernkurve war mit CACT-Bildsteuerung steiler. Räumliches Denkvermögen kann möglicherweise das Erlernen bildgesteuerter Punktionen beschleunigen. Kernaussagen: Zitierweis
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
Author-wise bibliometric analysis based on entropy.
No full textAuthor-wise bibliometric analysis based on entropy.</p
Author Under Sail The Imagination of Jack London, 1893-1902
No full textIn Author Under Sail, Jay Williams offers the first complete literary biography of Jack London as a professional writer engaged in the labor of writing. It examines the authorial imagination in London's work, the use of imagination in both his fiction and nonfiction, and the ways he defined imagination in the creative process in his business dealings with his publishers, editors, and agents. In this first volume of a two-volume biography, Williams traverses the years 1893 to 1902, from London's "Story of a Typhoon" to The People of the Abyss. The Jack London who emerges in the pages of Author Under Sail is a writer whose partnership with publishers, most notably his productive alliance with George Brett of Macmillan, was one of the most formative in American literary history. London pioneered many author models during the heyday of realism and naturalism, blurring the boundaries of these popular genres by focusing on absorption and theatricality and the representation of the seen and unseen. London created an impassioned, sincere, and extremely personal realism unlike that of other American writers of the time. Author Under Sail is a literary tour de force that reveals the full range of London as writer, creative citizen, and entrepreneur at the same time it sheds light on the maverick side of machine-age literature.Intro -- Title Page -- Copyright Page -- Dedication -- Contents -- Acknowledgments -- Introduction -- 1. Spirit Truth -- 2. From Absorption to Theatricality and Back Again -- 3. "I Will Build a New Present" -- 4. Sons as Authors -- 5. Fathers as Publishers -- 6. The Daughter as Author -- 7. Lovers as Authors -- 8. At Sea with the Family -- 9. Yellow News, Yellow Stories -- 10. The Return Home -- Notes -- Bibliography -- Index -- About Jay WilliamsIn Author Under Sail, Jay Williams offers the first complete literary biography of Jack London as a professional writer engaged in the labor of writing. It examines the authorial imagination in London's work, the use of imagination in both his fiction and nonfiction, and the ways he defined imagination in the creative process in his business dealings with his publishers, editors, and agents. In this first volume of a two-volume biography, Williams traverses the years 1893 to 1902, from London's "Story of a Typhoon" to The People of the Abyss. The Jack London who emerges in the pages of Author Under Sail is a writer whose partnership with publishers, most notably his productive alliance with George Brett of Macmillan, was one of the most formative in American literary history. London pioneered many author models during the heyday of realism and naturalism, blurring the boundaries of these popular genres by focusing on absorption and theatricality and the representation of the seen and unseen. London created an impassioned, sincere, and extremely personal realism unlike that of other American writers of the time. Author Under Sail is a literary tour de force that reveals the full range of London as writer, creative citizen, and entrepreneur at the same time it sheds light on the maverick side of machine-age literature.Description based on publisher supplied metadata and other sources.Electronic reproduction. Ann Arbor, Michigan : ProQuest Ebook Central, YYYY. Available via World Wide Web. Access may be limited to ProQuest Ebook Central affiliated libraries
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