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Improving self‐organising information maps as navigational tools: a semantic approach

Yi‐ling Lin (School of Information Sciences, University of Pittsburgh, Pittsburgh, Pennsylvania, USA)
Peter Brusilovsky (School of Information Sciences, University of Pittsburgh, Pittsburgh, Pennsylvania, USA)
Daqing He (School of Information Sciences, University of Pittsburgh, Pittsburgh, Pennsylvania, USA)

Online Information Review

ISSN: 1468-4527

Article publication date: 21 June 2011

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Abstract

Purpose

The goal of the research is to explore whether the use of higher‐level semantic features can help us to build better self‐organising map (SOM) representation as measured from a human‐centred perspective. The authors also explore an automatic evaluation method that utilises human expert knowledge encapsulated in the structure of traditional textbooks to determine map representation quality.

Design/methodology/approach

Two types of document representations involving semantic features have been explored – i.e. using only one individual semantic feature, and mixing a semantic feature with keywords. Experiments were conducted to investigate the impact of semantic representation quality on the map. The experiments were performed on data collections from a single book corpus and a multiple book corpus.

Findings

Combining keywords with certain semantic features achieves significant improvement of representation quality over the keywords‐only approach in a relatively homogeneous single book corpus. Changing the ratios in combining different features also affects the performance. While semantic mixtures can work well in a single book corpus, they lose their advantages over keywords in the multiple book corpus. This raises a concern about whether the semantic representations in the multiple book corpus are homogeneous and coherent enough for applying semantic features. The terminology issue among textbooks affects the ability of the SOM to generate a high quality map for heterogeneous collections.

Originality/value

The authors explored the use of higher‐level document representation features for the development of better quality SOM. In addition the authors have piloted a specific method for evaluating the SOM quality based on the organisation of information content in the map.

Keywords

Citation

Lin, Y., Brusilovsky, P. and He, D. (2011), "Improving self‐organising information maps as navigational tools: a semantic approach", Online Information Review, Vol. 35 No. 3, pp. 401-424. https://doi.org/10.1108/14684521111151441

Publisher

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Emerald Group Publishing Limited

Copyright © 2011, Emerald Group Publishing Limited

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