1,721,021 research outputs found
A Formal Investigation of Mapping Language for Terminological Knowledge
Full text linkThe need for being able to talk about mappings between different ontologies has been recognized as a result of the fact that different ontologies may partially overlap or even represent the same domain from different points of view. Unlike for the case of ontology languages, work on mapping languages has not yet reached a state where a common understanding of the basic principles exists. In this paper we propose a formal comparison of existing mapping language by translating them into Distributed first order logic. We analyze underlying assumptions and differences in the interpretation of mapping
Reasoning about Ontology Mappings
Full text linkThe use of logic-based representations in distributed environments such as the semantic web has lead to work on the representation of and reasoning with mappings between distributed ontologies. Up to now the investigation of reasoning methods in this area was restricted to the use of mapping for query answering or subsumption reasoning. In this paper, we investigate the task of reasoning about the mappings themselves. We identify a number of properties such as consistency and entailment of mappings that are important for validating and comparing mappings. We provide formal definitions for these properties and show how the properties can be checked using existing reasoning methods by reducing them to local and global satisfiability testing in distributed description logics
Improving Automatically Created Mappings Using Logical Reasoning
No full textA lot of attention has been devoted to heuristic methods for discovering semantic mappings between ontologies. Despite impressive improvements, the mappings created by these automatic matching tools are still far from being perfect. In particular, they often contain wrong and redundant mapping rules. In this paper we present an approach for improving such mappings using logical reasoning in the context of Distributed Description Logics (DDL). Our method is orthogonal to the matching algorithm used and can therefore be used in combination with any matching tool. We explain the general idea of our approach informally using a small example and present the results of experiments conducted on the OntoFarm Benchmark which is part of the Ontology Alignment Evaluation challenge
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
Building An Integrated Formal Ontology for Semantic Interoperability in the Fishery Domain
Full text linkThis paper outlines a project (involving FAO, SIFAR, and CNR) aiming at building a formal ontology in the fishery domain. The ontology will support semantic interoperability among existing fishery information systems and will enhance information extraction and text marking, envisaging a fishery semantic web. The ontology is being built through the conceptual integration of existing fishery terminologies, thesauri, reference tables, and topic trees
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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