1,721,067 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
La simulazione di episodi di inquinamento atmosferico per il supporto alle decisioni nelle politiche di sanità
No full textLa gestione dei rischi sanitari ed ambientali necessita di un supporto alle decisioni in grado di fornire elementi di valutazione del rischio in analisi spazio-temporale. L’architettura di tale sistema deve quindi essere in grado di integrare database geografici ed alfanumerici, modelli matematici e sistemi informativi geografici, mediante un sistema esperto.
In questo lavoro viene presentata una applicazione di simulazione di aggravio di inquinamento atmosferico dovuto all’emissione di un ipotetico camino posto in un sito industriale situato nell’area fiorentina. I risultati ottenuti consentono di effettuare la valutazione del rischio industriale, con particolare riferimento ai rischi di incidenti rilevanti in grado di determinare un pericolo grave, immediato o differito, per la salute umana e per ‘ambiente (Direttiva CE 82/96, recepita in Italia con D.Lgs. n. 334 del 17.8.1999).The healthy and environmental risk management needs a decision support system able to evaluate consequences in a spatial and multi-temporal approach. The structure of this system is able to perform integrations from geographic and alphanumeric databases, mathematical models and geographic information systems through an expert system.
In this paper, a simulation of an atmospheric pollution episode due to a stack release placed in the neighbour of the city of Florence (Italy) is presented. The results of the application have long-term human and environmental hazards from major accidents due to dangerous substances (Directive CE 82/96, implemented in Italy with D.Lgs. n. 334 dated 17.8.1999)
Impianti industriali interessati ad incidenti connessi al trasporto di sostanze pericolose: proposta di metodologia per la valutazione del rischio basata sul danno economico
No full textConvegno VGR 2
An Integrated approach to the pollution hazard analysis and management
No full textThe risk analysis includes the detection of hazards, the assessment of risks and
their management. These three main aspects of environmental risk study are
strictly linked together in order to archive an effective mitigation of hazards and
to minimize consequences. In this work an integrated approach to the study of
the environmental system is presented to allow an effective management of risk
and the mitigation of possible hazards and a decision support to operators and
authorities. The aim of this paper is to present our approach to the study of
atmospheric pollution by using the environmental management platform
Terrapack® [4]. An application to the simulation of an air pollution episode due
to a smoke-stack placed in the neighbourhood of the city of Florence (Italy) is
shown. The analysis includes vector, raster and alpha-numeric data: groundbased
meteorological and pollutants concentration measurements from on-site
monitoring network, digital map of complex terrain, emission census, and
modelling data base which includes our dispersion code to simulate the air
pollution episode. In the simulation system, both the common used air pollution
models based on the Gaussian plume equation [1] and the mixed method [2]
describing the plume time evolution by means of elements, either segments or
puffs are included . The latter model being used in the calm or low-wind
situations and in both nonstationary and nonhomogeneous conditions. The time
evolution of the 2-3D pollutant (SO]) concentration maps will be shown. Results
of our simulation code have been compared to results of MODIA code, a
simulation software program validate from U.S. EPA [3]
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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