1,721,008 research outputs found
The map generator tool
No full textWe present the MaGe system, which helps users and developers to build maps of the Web graph. Maps abstract and represent in a concise and machine-readable way regions of information on the Web
Building knowledge maps of Web graphs
Full text linkWe research the problem of building knowledge maps of graph-like information. There exist well-consolidated cartographic principles and techniques for mapping physical landscapes. However, we live in the digital era and similarly to the Earth, the Web is simply too large and its interrelations too complex for anyone to grasp much of it through direct observation. Thus, the problem of applying cartographic principles also to digital landscapes is intriguing. We introduce a mathematical formalism that captures the general notion of map of a graph and enables its development and manipulation in a semi automated way. We present an implementation of our formalism on the Web of Linked Data graph and discuss algorithms that efficiently generate and combine (via an algebra) regions and maps. We present the MaGe tool, implementing the map framework, and discuss examples of knowledge maps
The swget portal: Navigating and acting on the web of linked data
Full text linkArtículo de publicación ISIThis paper presents the swget portal. By using the portal, users can instruct software modules to (virtually)
move from one place (data source) to another on theWebof Data, interpret knowledge and trigger actions
much in the same spirit of intelligent agents. Instructions are specified via navigational expressions in
the NautiLOD language. Such expressions are included into swget scripts that is, RDF documents that can
be shared, modified, and reused. We discuss examples with real data in different scenarios showing the
usefulness and potentialities of the portal. We also provide an evaluation of the performance of the portal
NautiLOD: A Formal Language for the Web of Data Graph
Full text linkArtículo de publicación ISIThe Web of Linked Data is a huge graph of distributed and interlinked datasources fueled by structured
information. This new environment calls for formal languages and tools to automatize navigation across
datasources (nodes in such graph) and enable semantic-aware and Web-scale search mechanisms. In this
article we introduce a declarative navigational language for theWeb of Linked Data graph called NAUTILOD.
NAUTILOD enables one to specify datasources via the intertwining of navigation and querying capabilities. It
also features a mechanism to specify actions (e.g., send notification messages) that obtain their parameters
from datasources reached during the navigation. We provide a formalization of the NAUTILOD semantics,
which captures both nodes and fragments of the Web of Linked Data. We present algorithms to implement
such semantics and study their computational complexity. We discuss an implementation of the features of
NAUTILOD in a tool called swget, which exploits current Web technologies and protocols. We report on the
evaluation of swget and its comparison with related work. Finally, we show the usefulness of capturing Web
fragments by providing examples in different knowledge domains
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
The logic of extensional RDFS (Extended abstract)
No full textThe normative version of RDFS gives non-standard (intensional) interpretations to some standard notions such as classes and properties. In this paper we develop the extensional semantics for the RDFS vocabulary, which surprisingly preserves the simplicity and computational complexity of deduction of the intensional case. This result will impact current implementations in a positive sense, as reasoning in RDFS will follow common set-based intuitions and be compatible with OWL extensions; moreover, the rule system that we present is easily embeddable in existing libraries such as Jena
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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