1,720,967 research outputs found
Intelligenza artificiale applicata alla radiomica: diagnostica differenziale dei tumori cerebrali intrassiali e risvolti clinici nella loro gestione neurochirurgica
Full text linkI glioblastomi (GBM) rappresentano i tumori cerebrali maligni primari più comuni negli adulti, con un’incidenza stimata di 3–4 casi per 100.000 abitanti per anno e una prognosi sfavorevole nonostante i progressi terapeutici. I linfomi primitivi del sistema nervoso centrale (PCNSL), sebbene più rari, mostrano un’incidenza in aumento e richiedono un approccio terapeutico fondamentalmente diverso, basato principalmente su chemioterapia ad alte dosi e radioterapia. In questo contesto, una diagnosi differenziale accurata e precoce tra GBM e PCNSL è cruciale per garantire strategie terapeutiche personalizzate.
L’obiettivo del nostro studio è stato sviluppare e addestrare un sistema di intelligenza artificiale (AI) basato su analisi radiomica, in grado di differenziare i GBM dai linfomi cerebrali primitivi. Il modello è stato addestrato utilizzando esclusivamente immagini di risonanza magnetica (MRI) pesate in T1 con mezzo di contrasto, estraendo caratteristiche radiomiche avanzate ispirate ai modelli presenti nella letteratura attuale. Il sistema di AI ha raggiunto una sensibilità diagnostica paragonabile, e in alcuni casi superiore, a quella di neuroradiologi esperti, in linea con recenti evidenze sul ruolo dell’AI nell’imaging neuro-oncologico. Questi risultati suggeriscono una potenziale utilità dell’AI come strumento di supporto decisionale in contesti clinici controllati e come ausilio complementare all’interpretazione esperta nella pratica quotidiana.
Nonostante l’utilizzo di una singola sequenza MRI, il modello ha dimostrato prestazioni promettenti, indicando che l’inclusione di ulteriori sequenze multiparametriche potrebbe migliorare ulteriormente l’accuratezza diagnostica negli sviluppi futuri.Glioblastomas (GBM) represent the most common primary malignant brain tumors in adults, with an estimated incidence of 3–4 cases per 100,000 population per year and a poor prognosis despite therapeutic advances. Primary central nervous system lymphomas (PCNSL), although rarer, show an increasing incidence and require a fundamentally different therapeutic approach, primarily based on high-dose chemotherapy and radiotherapy. In this context, an accurate and early differential diagnosis between GBM and PCNSL is crucial to ensure personalized treatment strategies.
The aim of our study was to develop and train an artificial intelligence (AI) system based on radiomic analysis capable of differentiating GBM from primary cerebral lymphomas. The model was trained exclusively using contrast-enhanced T1-weighted magnetic resonance imaging (MRI), extracting advanced radiomic features inspired by current literature models. The AI system achieved a diagnostic sensitivity comparable to, and in some cases exceeding, that of experienced neuroradiologists, consistent with recent reports on the role of AI in neuro-oncologic imaging. These findings suggest the potential utility of AI as a decision-support tool in controlled clinical settings and as a complementary aid to expert interpretation in daily practice.
Despite relying solely on a single MRI sequence, the model demonstrated promising performance, indicating that the inclusion of additional multiparametric MRI sequences could further enhance diagnostic accuracy in future developments
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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