1,720,959 research outputs found
Data issues at the Euro-Mediterranean Centrefor Climate Change
No full textClimate change represents an important and critical challenge for several scientists and researchers. Increasingly complex simulation models, management of petabytes of datasets (which are already too massive for current storage devices) are issues that must be faced up to in climate centres. Key elements that must be taken into account are strongly connected both with data and metadata management. Indeed, petabytes of climate data, big collections of datasets are continuously produced, delivered, accessed, processed by scientists and researchers from multiple sites at an international level. Despite the classical approaches, data-grid-enabled solutions greatly address scalability (users, data, queries, etc.), transparency (access, integration, management, presentation) and efficiency (performance) allowing the management of huge and distributed datasets. Taking into consideration the climate data growth rate, a full decentralized schema for the management of data and metadata (addressing data availability, scalability, site autonomy and efficiency) represents the most suitable solution in the proposed environment. This work presents the Euro-Mediterranean Centre on Climate Change (CMCC) initiative, discussing data and metadata issues and dealing with both architectural and infrastructural aspects concerning the adopted grid enabled solution. A complete overview of the grid services deployed at the Centre is presented as well as the client side support (CMCC data portal and monitoring dashboard)
GRelC Data Gather Service: a Step Towards P2P Production Grids
No full textCurrent production Grids involve hundreds of sites and thousands of machines. In this context, P2P solutions are well suited - with regard to existing centralized and hierarchical approaches - to implement highly scalable, decentralized, reliable and manageable grid services. In this paper we describe the GReIC Data Gather Service from an architectural and technological point of view. This service has been developed within the Grid Relational Catalog (GReIC) Project, at the Center for Advanced Computational Technologies (CACT) of the University of Lecce. The GReIC Data Gather architecture aims at integrating transparently and securely distributed and geographically spread heterogeneous grid data sources through Data Gather Service nodes connected in a P2P fashion
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
Advanced Grid DataBase Management with the GRelC Data Access Service
No full textMany data grid applications manage and process huge datasets distributed across multiple grid nodes and stored into heterogeneous databases; e-Science projects need to access widespread databases within a computational grid environment, through a set of secure, interoperable and efficient data grid services. In the data grid management area several projects aims at addressing these issues providing different solutions and proposing a set of data access and integration/federation services.
In this paper we present the GRelC Data Access, a WS-I based data grid access service developed by SPACI Consortium and the University of Salento. Its architectural design is discussed and experimental results related to an European testbed are also reported
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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