1,720,961 research outputs found
Facial Recognition System: tecniche e algoritmi.
No full textIl riconoscimento facciale (facial recognition) è una delle branche della biometria fisiologica, incentrate sullo sviluppo di algoritmi e tecniche matematiche per l’autenticazione o l’identificazione di soggetti attraverso l’estrazione di caratteristiche fondamentali dei loro volti. Fondata principalmente su tecniche di intelligenza artificiale è in grado di identificare o verificare l’identità di un individuo da un’immagine digitale o da un frame video, mediante il riconoscimento di pattern, in cui il pattern da riconoscere è il viso umano
Integer Sequences in Cryptography: A New Generalized Family and its Application
Full text linkInteger sequences play a pivotal role in cryptography, acting as foundational elements for numerous cryptographic algorithms. This comprehensive investigation examines integer sequences that have significantly impacted the sector in domains such as key generation, hash function design, and encryption protocol development, including their specific implementations. We conduct an unprecedented systematic review of existing literature, analysing fundamental properties of these sequences and detailing their contributions to well-established cryptographic areas. In addition, the research emphasises the various strengths and limitations associated with these sequences, as well as their practical applications in the realm of digital information security. This is accomplished by developing a categorisation framework that facilitates mapping of their contributions. Furthermore, this framework can be used as a reference point for future analyses in this field.
As a result, our initial emphasis was on the thorough investigation and conceptualisation of a novel integer sequence generation model. This model holds the potential to be remarkably unique, capable of unifying and encompassing both existing integer sequences and those yet to be discovered into a cohesive and comprehensive framework. Following this foundational work, our attention shifted to analysing the prospective applications of this model, particularly within the field of cryptography. Here, we honed in on the intricate concept of randomness, delving into a detailed analysis of its potential significance and the various implications it may hold for advancing cryptographic techniques and security protocols.
Randomness is a key ingredient in every area of cryptography and producing it should not be left to chance. Unfortunately, it is very difficult to produce true randomness, and consuming applications often call for large, high quality amounts on boot or in quick succession. To meet this requirement, we make use of Pseudo-Random Number Generators (PRNGs) which we initialise with a small amount of randomness to produce what we hope to be high quality pseudo-random output.
Therefore, our model has been instrumental in the design of a PRNG which has exhibited statistically significant capabilities, as well as satisfactory performance metrics, to corroborate its inherent randomness properties.
In summary, this study emphasises the considerable potential that exists for the ongoing exploration and development of novel applications involving integer sequences within the domain of cryptography. The findings suggest that these sequences could play a pivotal role in enhancing and advancing cryptographic methodologies, opening avenues for new innovations and improvements
Coronavirus (COVID-19) in Italy: knowledge, management of patients and clinical experience of Italian dentists during the spread of contagion
Full text linkBackground: The coronavirus infection that emerged in China in the last few months of 2019 has now spread
globally. Italy registered its first case in the second half of February, and in a short time period, it became the top
country in Europe in terms of the number of infected people and the first in the world in terms of deaths. The
medical and scientific community has been called upon to manage the emergency and to take measures. Dentists
also need to take new precautions during their clinical activity to protect themselves, coworkers and patients from
the risks of contagion and to avoid further spread of infection.
Methods: Following the data published in the international literature as well as the guidelines and directives
constantly updated by the WHO and by the national health authorities, a questionnaire to be completed
anonymously was submitted online to Italian dentists using social tools and online professional platforms. The
collected data were processed statistically, providing descriptive data and analysis of correlations of the most
significant parameters using the Pearson’s χ2, the Likelihood-Ratio χ2, Cramér’s V, Fisher’s exact test, Goodman and
Kruskal’s γ, and Kendall’s τb (p < 0.05).
Results: A total of 535 dentists from Italy participated in the survey. A good level of scientific knowledge about
coronavirus and the extra precautionary measures needed to limit the spread was related to the age of
respondents and their sex. Coming from areas with higher concentrations of cases affected knowledge, level of
attention and perception of risk related to dental activity.
Conclusions: At the moment, there are no therapies or vaccines to contain the infection with the new coronavirus
that is causing many infections, many of which are fatal, worldwide. Dentists are one of the categories at highest
risk of encountering diseases and infections because they work in close proximity with patients, and in their
procedures, there is always contact with aerosols with high bacterial and viral potential. Therefore, during this
COVID-19 emergency, it is important that dentists are properly informed and take the appropriate precautionary
measures
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
Clear Aligners and Smart Eye Tracking Technology as a New Communication Strategy between Ethical and Legal Issues
Full text linkSmart eye-tracking technology (SEET) that determines visual attention using smartphones can be used to determine the aesthetic perception of different types of clear aligners. Its value as a communication and comprehension tool, in addition to the ethical and legal concerns which it entails, can be assessed. One hundred subjects (50 F, 50 M; age range 15–70) were equally distributed in non-orthodontic (A) and orthodontic (B) groups. A smartphone-based SEET app assessed their knowledge of and opinions on aligners. Subjects evaluated images of smiles not wearing aligners, with/without attachments and with straight/scalloped gingival margins, as a guided calibration step which formed the image control group. Subsequently, the subjects rated the same smiles, this time wearing aligners (experimental images group). Questionnaire data and average values for each group of patients, and images relating to fixation times and overall star scores, were analyzed using these tests: chi-square, t-test, Mann–Whitney U, Spearman’s rho, and Wilcoxon (p < 0.05). One-way ANOVA and related post-hoc tests were also applied. Orthodontic patients were found to be better informed than non-orthodontic patients. Aesthetic perception could be swayed by several factors. Attachments scored lower in aesthetic evaluation. Lips distracted attention from attachments and improved evaluations. Attachment-free aligners were better rated overall. A more thorough understanding as to the opinions, expectations and aesthetic perception of aligners can improve communication with patients. Mobile SEET is remarkably promising, although it does require a careful medicolegal risk–benefit assessments for responsible and professional use
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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