1,720,971 research outputs found
Recurrence quantification Analysis describes the complex and deterministic behaviour of heart rate variability in healthy subjects. IEEE ENGINEERING IN MEDICINE AND BIOLOGY MAGAZINE
No full textThis study highlights the application of recurrence quantification analysis (RQA) to derive information about nonlinear properties of heart rate variability (HRV). Parameters introduced by RQA, based on distance, recurrence and entropy of Recurrence Plots (RPs), show a natural application to cardiovascular signals, as descriptors of variable inherent complexity and determinism in different physiological conditions. RQA was applied to RR interval series collected in healthy subjects during relaxation, providing quantitative markers associated with the presence of complexity and determinism in HRV
Integrating a framework for discovering alternative app stores in a mobile app monitoring platform
No full textNowadays, implementing brand protection strategies has become a necessity for enterprises delivering services through dedicated apps. Increasingly, malicious developers spread unauthorized (fake, malicious, obsolete or deprecated) mobile apps through alternative distribution channels and marketplaces. In this work, we propose a framework for the early detection of these alternative markets advertised through social media such as Twitter or Facebook or hosted in the Dark Web. Specifically, it combines a data modeling approach and an ensemble learning technique, allowing to recommend web pages that are likely to represent alternative marketplaces. The framework has been implemented in a prototype system called Unauthorized App Store Discovery (UASD), and integrated in a security enterprise platform for the monitoring of malicious/unauthorized mobile apps. UASD allows to analyze web pages extracted from the Web and exploits a classification model to distinguish between real app stores and similar pages (i.e. blogs, forums, etc.) which can be erroneously returned by a common search engine. An experimental evaluation on a real dataset confirms the validity of the approach in terms of accuracy
Nonlinear analysis of carotid artery echographic images RID A-6953-2008
No full textThis study deals with application of nonlinear analysis to the identification of spatial complex patterns in echographic images of normal and pathological carotid arteries. Complexity measures indices in normal and atherosclerotic plaques, related to slow space-temporal evolution of biological patterns, are evaluated. In particular, we found that the correlation dimension index lets to differentiate normal from pathological groups, allowing to infer on complex interaction mechanism responsible of plaque formation process
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
Enhancing Public Digital Identity System (SPID) to Prevent Information Leakage
No full textPublic Digital Identity System (SPID) is the Italian government framework compliant with the EU eIDAS regulatory environment, aimed at implementing electronic identification and trust services in e-government and business applications. According to this federated identity management framework, digital identities are issued, upon application of the interested party, by digital identity providers. This way, users authenticate to service providers, which are public or private organizations providing a service to authorized users, provided that they adhere to SPID. A drawback that could limit the real diffusion of this framework is that, despite the fact that identity and service providers might be competitor private companies, SPID authentication results in information leakage about customers of identity providers. To overcome this potential limitation, in this paper, we propose a modification of SPID to allow user authentication by preserving the anonymity of the identity provider that grants the authentication credentials. This way, information leakage about customers of identity providers is fully prevented
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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