1,721,103 research outputs found
An Algebraic Approach for Robust Fault Detection of Input-Output Elastodynamic Distributed Parameter Systems
No full textThis paper deals with the problem of designing a
robust fault detection methodology for a class of input-output,
uncertain dynamical distributed parameter systems, namely
mechanical elastodynamic systems, which are representative of
a whole class of problems related to on-line health monitoring
of mechanical and civil engineering structures. The proposed
approach does not require full state measurements and is
robust to measuring, modeling and numerical errors, thanks
to a time varying detection threshold. In order to avoid the
problems associated with classical discretization techniques for
distributed parameter systems, which can lead to numerical
errors difficult to bound a priori, and thus higher thresholds,
a suitable structure-preserving algebraic approach, called Cell
Method, will be employed. This method consists in writing the
equations of a distributed parameter system directly in discrete
form, avoiding the usual discretization process and leading to
a symplectic, that is energy preserving, numerical scheme
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
Current status of MR imaging in the evaluation of IBD in a pediatric population of patients
No full textDiagnosis and follow-up of inflammatory bowel disease (IBD) in children represent a challenging issue for pediatricians. Nowadays MR studies of the bowel represent a valid diagnostic tool especially in the diagnosis and follow-up of ileal and perianal Crohn's disease in children as well as in adults. The lack of ionizing radiation of MRI enhances the interest of clinicians with respect to CT studies of the bowel in children. Thanks to recent technical development in terms of fast MR images acquisition a reasonable image quality can be easily achieved in scholar-age children. A majority of authors prefer MR-enterography approach in children with respect to the more invasive MR-enteroclysis in the assessment of ileal Crohn's disease. Using rigorous technique of MR-enterography represents a feasible and accurate test in the diagnosis of ileal Crohn's disease. Less experience is collected on MR-colonography in pediatric IBD while MRI of the pelvis represents the most accurate non-invasive diagnostic test in the assessment of perianal Crohn's disease in children as well as in adults. (C) 2008 Elsevier Ireland Ltd. All rights reserved
Usage of structured reporting in radiological practice: results from an Italian online survey
No full textObjectives: To assess the opinion on structured reporting (SR) and its usage by radiologist members of the Italian Society of Medical Radiology (SIRM) via an online survey. Methods: All members received an email invitation to join the survey as an initiative by the SIRM Imaging Informatics Chapter. The survey included 10 questions about demographic information, definition of radiological SR, its usage in everyday practice, perceived advantages and disadvantages over conventional reporting and overall opinion about SR. Results: 1159 SIRM members participated in the survey. 40.3 % of respondents gave a correct definition of radiological SR, but as many as 56 % of them never used it at work. Compared with conventional reporting, the most appreciated advantages of SR were higher reproducibility (70.5 %), better interaction with referring clinicians (58.3 %) and the option to link metadata (36.7 %). Risk of excessive simplification (59.8 %), template rigidity (56.1 %) and poor user compliance (42.1 %) were the most significant disadvantages. Overall, most respondents (87.0 %) were in favour of the adoption of radiological SR. Conclusions: Most radiologists were interested in radiological SR and in favour of its adoption. However, concerns about semantic, technical and professional issues limited its diffusion in real working life, encouraging efforts towards improved SR standardisation and engineering. Key Points: • Despite radiologists’ awareness, radiological SR is little used in working practice. • Perceived SR advantages are reproducibility, better clinico-radiological interaction and link to metadata. • Perceived SR disadvantages are excessive simplification, template rigidity and poor user compliance. • Improved standardisation and engineering may be helpful to boost SR diffusion
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