1,720,957 research outputs found
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
A text mining approach to materiality assessment
Full text linkWorldwide companies currently make a significant effort in performing the materiality analysis, whose aim is to explain corporate sustainability in an annual report. Materiality reflects what are the most important social, economic and environmental issues for a company and its stakeholders. Many studies and standards have been proposed to establish what are the main steps to follow to identify the specific topics to be included in a sustainability report. However, few existing quantitative and structured approaches help understanding how to deal with the identified topics and how to prioritise them to effectively show the most valuable ones. Moreover, the use of traditional approaches involves a long-lasting and complex procedure where a lot of people have to be reached and interviewed and several companies' reports have to be read to extrapolate the material topics to be discussed in the sustainability report. This dissertation aims to propose an automated mechanism to gather stakeholders and the company's opinions identifying relevant issues. To accomplish this purpose, text mining techniques are exploited to analyse textual documents written by either a stakeholder or the reporting company. It is then extracted a measure of how much a document deals with some defined topics. This kind of information is finally manipulated to prioritise topics based on how the author's opinion matters. The entire work is based upon a real case study in the domain of telecommunications
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
Radiatively consistent retrieval of cloud, aerosol and surface properties from space-based observations in the solar spectral region
No full textSatellite instruments operating in the visible and near-infrared parts of the electromagnetic spectrum offer a unique opportunity to study the global distribution of aerosols and their optical properties. These can be obtained from the observed satellite radiances through specialised inversion algorithms. While significant progress has been achieved in the past decade, current algorithms still face three outstanding challenges. First, there is in general a strong radiative coupling among the different retrieval vari- ables. When this radiative coupling is not correctly accounted for or when different variables are retrieved with different radiometric assumptions, inconsistencies arise. Second, aerosol retrievals from satellites are normally performed in clear sky situations only, excluding a safety area around clouds to avoid potential cloud contamination in the aerosol measurements. However, recent studies suggest that excluding pixels in the vicinity of clouds from aerosol retrieval could potentially lead to aerosol load underestimation due to size swelling in more humid environments near clouds. Finally, the large availability of satellite data makes it desirable to be able to apply the same algorithm to different sensors.In this PhD project, these challenges are addressed with the development of the Combined Inversion of Surface and Aerosol (CISAR) algorithm for the joint retrieval of surface reflectance and aerosol single-scattering properties. It features a continuous variation of the state variables in the solution space, and by considering the coupling between the surface and atmosphere, delivers a radiatively consistent product. Thanks to the flexibility of its inversion algorithm, CISAR can be applied to different sensors operating in the visible and near-infrared onboard satellites flying at different orbits. The CISAR algorithm has also been adapted to include the retrieval of cloud properties, extending the aerosol retrieval to the vicinity of clouds to deepen the study of aerosol properties in such conditions. The first part of the thesis introduces aerosols and clouds and their retrieval from satellites. The second part consists of the three research papers detailing all the scientific results obtained during the PhD. The first paper (Govaerts and Luffarelli, 2018) presents the theoretical concepts of the CISAR algorithm. The second paper (Luffarelli and Govaerts, 2019) demonstrates CISAR’s applicability to both geostationary and polar-orbiting satellites and evaluates its performances. The third paper (Luffarelli et al. 2022) describes the extension of the algorithm to the retrieval of clouds and discusses the innovative combined aerosol-cloud product during a dust storm originating from Africa in June 2020.This research opens up new ways of approaching aerosol retrieval from satellites, al- lowing the retrieval in situations that are normally discarded by aerosol retrieval algorithms. This could allow a more realistic estimation of the direct effect of aerosols on the radiative forcing.Doctorat en Sciencesinfo:eu-repo/semantics/nonPublishe
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
Vulnerability assessment: studio delle finestre di vulnerabilità e sviluppo di un nuovo strumento
Full text linkAlla base di questo studio vi è l’analisi delle vulnerabilità legate a un software e al loro ciclo di vita. In particolare, si pone l’attenzione su quanto sia inevitabile avere un software vulnerabile installato nei propri sistemi e su quanto sia quindi importante avere consapevolezza dei suoi punti deboli per non farsi cogliere impreparati a fronte di un attacco. Il progetto, inoltre,
mira a proporre una strumentazione il più possibile idonea alla raccolta di informazioni circa le vulnerabilità associate alle applicazioni.
La tesi è articolata in cinque capitoli: nel primo vengono fornite le descrizioni circa il significato di una vulnerabilità per un software, il significato di una finestra di vulnerabilità e di quali siano le fasi del ciclo di vita di questa finestra e, inoltre, si lasciano spunti per riflessioni che vanno oltre il contesto informatico. Nel secondo capitolo si definisce il concetto di "Vulnerability assessment" sottolineando come sia importante la presenza di fonti attendibili
presso cui cercare informazioni. Il terzo capitolo introduce il lettore a quello che sarà il software creato per questa tesi elencando quali requisiti tale software deve possedere e quali sono le possibili fonti da cui raccogliere informazioni. Nel quarto capitolo si descrive la fase di design del progetto, dettagliandone la struttura architetturale. Il quinto e ultimo capitolo presenta
la fase di implementazione del progetto, corredata da frammenti di codice e diagrammi di vario genere
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