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About

Areas of Interest:

  • Information Retrieval
  • Network Science
  • Information Science
  • Machine Learning
  • Web Technologies

Interest
Topics
Details

Details

  • Name

    José Luís Devezas
  • Cluster

    Computer Science
  • Role

    Research Assistant
  • Since

    08th November 2011
Publications

2017

Information Extraction for Event Ranking

Authors
Devezas, JL; Nunes, S;

Publication
6th Symposium on Languages, Applications and Technologies, SLATE 2017, June 26-27, 2017, Vila do Conde, Portugal

Abstract
Search engines are evolving towards richer and stronger semantic approaches, focusing on entity-oriented tasks where knowledge bases have become fundamental. In order to support semantic search, search engines are increasingly reliant on robust information extraction systems. In fact, most modern search engines are already highly dependent on a well-curated knowledge base. Nevertheless, they still lack the ability to e ectively and automatically take advantage of multiple heterogeneous data sources. Central tasks include harnessing the information locked within textual content by linking mentioned entities to a knowledge base, or the integration of multiple knowledge bases to answer natural language questions. Combining text and knowledge bases is frequently used to improve search results, but it can also be used for the query-independent ranking of entities like events. In this work, we present a complete information extraction pipeline for the Portuguese language, covering all stages from data acquisition to knowledge base population. We also describe a practical application of the automatically extracted information, to support the ranking of upcoming events displayed in the landing page of an institutional search engine, where space is limited to only three relevant events. We manually annotate a dataset of news, covering event announcements from multiple faculties and organic units of the institution. We then use it to train and evaluate the named entity recognition module of the pipeline. We rank events by taking advantage of identified entities, as well as partOf relations, in order to compute an entity popularity score, as well as an entity click score based on implicit feedback from clicks from the institutional search engine. We then combine these two scores with the number of days to the event, obtaining a final ranking for the three most relevant upcoming events. © José Devezas and Sérgio Nunes

2017

Graph-Based Entity-Oriented Search: Imitating the Human Process of Seeking and Cross Referencing Information

Authors
Devezas, J; Nunes, S;

Publication
ERCIM News

Abstract

2016

Index-Based Semantic Tagging for Efficient Query Interpretation

Authors
Devezas, J; Nunes, S;

Publication
EXPERIMENTAL IR MEETS MULTILINGUALITY, MULTIMODALITY, AND INTERACTION, CLEF 2016

Abstract
Modern search engines are evolving beyond ad hoc document retrieval. Nowadays, the information needs of the users can be directly satisfied through entity-oriented search, by ranking the entities or attributes that better relate to the query, as opposed to the documents that contain the best matching terms. One of the challenges in entity-oriented search is efficient query interpretation. In particular, the task of semantic tagging, for the identification of entity types in query parts, is central to understanding user intent. We compare two approaches for semantic tagging, within a single domain, one based on a Sesame triple store and another one based on a Lucene index. This provides a segmentation and annotation of the query based on the most probable entity types, leading to query classification and its subsequent interpretation. We evaluate the run time performance for the two strategies and find that there is a statistically significant speedup, of at least four times, for the index-based strategy over the triple store strategy.

Supervised
thesis

2017

Graph-Based Entity-Oriented Search

Author
José Luís da Silva Devezas

Institution
UP-FEUP

2016

Exploring the Sea: Heterogenous Geo-Referenced Data Repository

Author
Inês Davim Lopes Garganta Silva

Institution
UP-FEUP