1,721,187 research outputs found
What drives influencer's impact
No full textWord-of-mouth drives consumer attitudes and choice, but not all products and services are naturally discussed. Consequently, companies have started using influencers to generate awareness and drive purchase. But while some influencers' posts get lots of engagement and boost sales, others do not. What makes some posts more impactful? The present dissertation work leverages a multimethod approach (combining automated text, image, and video analysis of thuousands of social media posts with controlled experiments) to examine how features like the language influencers use, and the images they post, shape their impact. The first essay investigates sensory language (e.g., "tasty"), the second essay examines language arousal (e.g., "AMAZING!!"), and the third essay examines social tie presence (e.g., appearing with someone else) in photos. The findings shed light on what drives word-of-mouth, the psychology of social influence, and strategies for developing more effective social media content
Inflammatory fibroid polyp (Vanek's tumor) of the gastric antrum: is treatment always mandatory?
No full textINTRODUCTION:
Inflammatory fibroid polyp (IFP), also known as Vanek's tumor, is a rare polypoid lesion of the gastrointestinal tract. A recently observed case led us to review the literature, with the aim to discuss the management of asymptomatic gastric IFPs.
CASE REPORT:
A 71-year-old man was endoscopically diagnosed as having a polypoid lesion located in the gastric antrum. Histopathological and himmunoistochemical studies of endoscopic biopsies revealed an IFP. Endoscopic resection was proposed, but the patient refused such a treatment because he was asymptomatic for his polyp. After three years the patient is asymptomatic and the endoscopic surveillance follow-up has showed no evidence of growth nor other modifications of the gastric IFP.
DISCUSSION:
Gastric IFPs are benign polyps of unknown etiology which sometimes pose problems of differential diagnosis with GISTs, and various mesenchymal tumors. Although gastric IFPs are benign lesions usually asymptomatic, most of the cases reported in the literature have been treated by endoscopic or surgical excision. In the case described herein, no modifications of the polyp were observed at endoscopic follow-up.
CONCLUSION:
This case description suggests that removal of gastric IFPs, either by endoscopic or surgical approach, may not be mandatory in asymptomatic patients
Neuroimaging Applications in Restless Legs Syndrome
No full textNeuroimaging studies provide information useful to understand the pathophysiology of restless legs syndrome. Molecular PET and SPECT imaging findings mainly supported dysfunction of dopaminergic pathways involving not only the nigrostriatal but also mesolimbic pathways. Magnetic resonance imaging (MRI) studies have used different techniques. Studies using iron-sensitive sequences supported the presence of a regionally variable low brain iron content, mainly at the level of substantia nigra and thalamus. The search for brain structural or microstructural abnormalities by voxel-based morphometry, diffusion tensor imaging or cortical thickness analysis has reported none or variable findings in restless legs syndrome patients, most of them in regions belonging to sensorimotor and limbic/nociceptive networks. Functional MRI studies have substantially demonstrated activation or connectivity changes in the same networks. Magnetic resonance spectroscopy studies showed metabolic changes in the thalamus, which is a hub of these networks. In summary, neuroimaging findings in restless legs syndrome support the presence of reduction of brain iron content, of dysfunction of mesolimbic and nigrostriatal dopaminergic pathways, and of abnormalities at level of limbic/nociceptive and sensorimotor networks
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
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