Perspectivas da representação documental: discussão e experiências

Access to information is at the heart of the discussions of contemporary society, whether due to the multiplicity of infotechnological mechanisms that are geared to its generation and use, or through the arguments for promoting information for social and cultural democratization through citizen education. The Information Science, for consecrating the information as its object of research, systematizes, in the Documentary Representation, the critical and analytical study of theories, instruments, methods and methodologies that allow to make the information accessible. It is in this scope that this book is proposed, since it adds knowledge, concepts and applications of the relationship between Technology, Information and Representation for the consolidation of the Documentary Representation and that aims to promote debates about the consolidation of discussions and actions that involve the organization and the representation of the information resources, as well as the processes of data management in automated environment and its use. The discussions also envision the technological and media resources, through computational structures, which permeate the production, organization, distribution, access, storage, preservation, use and reuse of information resources through representation methods and recovery. It is understood, above all, the plurality of epistemological, theoretical and methodological conceptions present in Information Science. This book is, therefore, the result of efforts of researchers of the Documentary Representation and reflects research and teaching actions that imply the descriptive and thematic treatment of information

Ontology-based text summarization. The case of Texminer

Purpose – The purpose of this paper is to look into the latest advances in ontology-based text summarization systems, with emphasis on the methodologies of a socio-cognitive approach, the structural discourse models and the ontology-based text summarization systems. Design/methodology/approach – The paper analyzes the main literature in this field and presents the structure and features of Texminer, a software that facilitates summarization of texts on Port and Coastal Engineering. Texminer entails a combination of several techniques, including: socio-cognitive user models, Natural Language Processing, disambiguation and ontologies. After processing a corpus, the system was evaluated using as a reference various clustering evaluation experiments conducted by Arco (2008) and Hennig et al. (2008). The results were checked with a support vector machine, Rouge metrics, the F-measure and calculation of precision and recall. Findings – The experiment illustrates the superiority of abstracts obtained through the assistance of ontology-based techniques. Originality/value – The authors were able to corroborate that the summaries obtained using Texminer are more efficient than those derived through other systems whose summarization models do not use ontologies to summarize texts. Thanks to ontologies, main sentences can be selected with a broad rhetorical structure, especially for a specific knowledge domain