1,720,985 research outputs found
Compression orientée restauration des images bruitées : application aux images échographiques
No full textThe medical diagnosis is strongly based on different medical imaging modalities. Consequently,the amount of digital image data to be stored or transmitted is huge. Hence,efficient and low-complexity compression becomes necessary. Medical image compression"intuitively" requires ensuring the quality of the diagnostic image while reducingthe bit rate. Regarding the modalities, ultrasound is one of the most widely used one.However, it has a drawback of visual quality caused by the speckle noise. This workaims to achieve speckle noise reduction together with lossy compression in ultrasoundmedical images, where the losses are mainly the undesirable speckle noise. Furthermore,the proposed compression scheme is efficiently applied to Magnetic ResonanceImages(MRI).In this thesis we propose three main contributions: a multi-output filter for specklereduction of medical ultrasound images, an image quality metric for medical context(ultrasound and MRI) and a scheme of compression for medical images. We perform astudy on the usability of opinion-unaware no-reference natural image quality metrics inthe context of medical images: filtered ultrasound and compressed Magnetic ResonanceImages (MRI), as result of the study we propose a metric adapted to medical images.Then, we propose a multi-output speckle reduction filter based on MMD (MOF-MMD),which makes it possible to obtain three filtered images that help the radiologist’s diagnosticneeds. Indeed, the diagnostic task is based on different characteristics of theimage. Since the end-user of the medical images is the radiologist, we believe that it ismore reasonable to evaluate the algorithm using human observers. Thus, we conducta subjective experiment involving three radiologists with different years of experience.The correlations between the subjective scores and the objective metrics outputs andthe impact of the radiologists years of experience are presented and analyzed. The lastcontribution consists on developing a lossy coding scheme based on the MMD appliedto ultrasound and MR Images.Le diagnostic médical est fortement basé sur différentes modalités d’imagerie médicale.En conséquence, la quantité de données d’images numériques à stocker ou à transmettreest considérable. Il devient nécessaire de développer des solutions de compressionefficace et peu complexe. La compression d’images médicales "intuitivement " exiged’assurer une qualité de l’image diagnostique qui n’engendre pas de risques d’erreur.Par ailleurs, l’échographie est l’une des modalités les plus utilisées. Cependant, elleprésente un inconvénient en terme de qualité visuelle causé par le bruit de speckle. Cetravail vise à réduire le bruit de speckle tout en effectuant une compression avec pertesdes images échographiques. Aussi, le schéma de compression proposé a été appliquéà une seconde modalité, l’imagerie par résonance magnétique (IRM). En effet l’IRMest une modalité gourmande en termes de capacité de stockage. Durant cette thèse,nous avons proposé trois contributions principales : un filtre à sorties multiples pourla réduction du speckle des images d’échographie médicale, une mesure de la qualitéd’image pour l’imagerie médicale (échographie et IRM) et un schéma de compressionpour les images médicales
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
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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