Journal of Big Data

Aims and scope

The Journal of Big Data publishes high-quality, scholarly research papers, methodologies and case studies covering a broad range of topics, from big data analytics to data-intensive computing and all applications of big data research. The journal examines the challenges facing big data today and going forward including, but not limited to: data capture and storage; search, sharing, and analytics; big data technologies; data visualization; architectures for massively parallel processing; data mining tools and techniques; machine learning algorithms for big data; cloud computing platforms; distributed file systems and databases; and scalable storage systems. Academic researchers and practitioners will find the Journal of Big Data to be a seminal source of innovative material.
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Os dados estão em toda a parte

Sérgio Mariano Dias, com colaboração de Gustavo Torres e Marcelo Pita, da divisão de Soluções Analíticas no Data Lake — 11 de dezembro de 2017
O que é ciência de dados? Qual o perfil e as competências do cientista envolvido nesse novo paradigma?

Formal Concept Analysis Applied to Professional Social Networks Analysis

Best Student Paper Award in area of Databases and Information Systems Integration for the paper entitled: Formal Concept Analysis applied to Professional Social Networks Analysis, 19th International Conference on Enterprise Information Systems (ICEIS). http://www.iceis.org/PreviousAwards.aspx?y=2018

Abstract: From the recent proliferation of online social networks, a set of specific type of social network is attracting more and more interest from people all around the world. It is professional social networks, where the users’ interest is oriented to business. The behavior analysis of this type of user can generate knowledge about competences that people have been developed in their professional career. In this scenario, and considering the available amount of information in professional social networks, it has been fundamental the adoption of effective computational methods to analyze these networks. The formal concept analysis (FCA) has been a effective technique to social network analysis (SNA), because it allows identify conceptual structures in data sets, through conceptual lattice and implication rules. Particularly, a specific set of implications rules, know as proper implications, can represent the minimum set of conditions to reach a specific goal. In this work, we proposed a FCA-based approach to identify relations among professional competences through proper implications. The experimental results, with professional profiles from LinkedIn and proper implications   extracted from PropIm algorithm, shows the minimum sets of skills that is necessary to reach job positions.

Silva, P., Dias, S., Brandão, W., Song, M. and Zárate, L. Formal Concept Analysis Applied to Professional Social Networks Analysis. In Proceedings of the 19th International Conference on Enterprise Information Systems (ICEIS 2017) – Volume 1, pages 123-134. ISBN: 978-989-758-247-9 Copyright © 2017 by SCITEPRESS – Science and Technology Publications, Lda. All rights reserved.

A methodology for analysis of concept lattice reduction

Abstract

Formal concept analysis (FCA) is a mathematical theory of data analysis with applications in many areas. The problem of obtaining a concept lattice of an appropriate size was identified in several applications as one of the most important problems of FCA. In order to deal with this problem several techniques with different characteristics were proposed for concept lattice reduction. However, there are currently no adequate methods to assess what types of knowledge transformations can result from a reduction. A methodology for analysis of concept lattice reduction is presented here. It is based on the use of sets of proper implications holding in the original and reduced formal contexts or concept lattices. Working with both sets of implications, the methodology is able to show what is preserved, eliminated, inserted or transformed by a reduction technique. Three classes of reduction techniques are analyzed from the standpoint of the methodology in order to highlight techniques of each class have in common with respect to the transformations performed. Such analysis is followed by specific examples in each class.

Keywords

  • Formal concept analysis;
  • Lattice reduction;
  • Proper implications 

Dias, Sérgio M.; Vieira, N. J. A methodology for analysis of concept lattice reduction, Information Sciences, Volume 396, August 2017, Pages 202-217, ISSN 0020-0255, http://dx.doi.org/10.1016/j.ins.2017.02.037.

Concept lattices reduction: definition, analysis and classification

Abstract

Formal concept analysis (FCA) is currently considered an important formalism for knowledge representation, extraction and analysis with applications in different areas. A problem identified in several applications is the computational cost due to the large number of formal concepts generated. Even when that number is not very large, the essential aspects, those effectively needed, can be immersed in a maze of irrelevant details. In fact, the problem of obtaining a concept lattice of appropriate complexity and size is one of the most important problems of FCA. In literature, several different approaches to control the complexity and size of a concept lattice have been described, but so far they have not been properly analyzed, compared and classified. We propose the classification of techniques for concept lattice reduction in three groups: redundant information removal, simplification, and selection. The main techniques to reduce concept lattice are analyzed and classified based on seven dimensions, each one composed of a set of characteristics. Considerations are made about the applicability and computational complexity of approaches of different classes.

Keywords

  • Formal concept analysis;
  • Concept lattices;
  • Reduction

Dias, Sérgio M.; Vieira, N. J. Concept lattices reduction: Definition, analysis and classification. Expert Systems with Applications, v. 42, p. 7084-7097, 2015. DOI: http://dx.doi.org/10.1016/j.eswa.2015.04.044