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Pixel-Oriented Network Visualization: Static Visualization of Change in Social Networks

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The Influence of Technology on Social Network Analysis and Mining

Part of the book series: Lecture Notes in Social Networks ((LNSN,volume 6))

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Abstract

Most common network visualizations rely on graph drawing. While without doubt useful, graphs suffer from limitations like cluttering and important patterns may not be realized especially when networks change over time. We propose a novel approach for the visualization of user interactions in social networks: a pixel-oriented visualization of a graphical network matrix where activity timelines are folded to inner glyphs within each matrix cell. Users are ordered by similarity which allows to uncover interesting patterns. The visualization is exemplified using social networks based on corporate wikis.

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Notes

  1. 1.

    This chapter is based on a conference paper at ASONAM 2010.

  2. 2.

    See [32] for a detailed discussion of this measure.

  3. 3.

    For example UCINET (http://www.analytictech.com/ucinet/), JUNG (http://jung.sourceforge.net/), Graphviz (http://www.graphviz.org/), GUESS (http://graphexploration.cond.org/), Pajek (http://pajek.imfm.si/), Visone (http://visone.info/), and others. See also http://www.google.com/Top/Science/Math/Combinatorics/Software/Graph_Drawing/, http://www.graphdrawing.org/ and the INSNA software list (http://www.insna.org/software/).

  4. 4.

    http://www.stanford.edu/group/sonia/

  5. 5.

    http://sonivis.org

  6. 6.

    For an animated representation of the network shown in Fig. 5.1 see http://www.kinf.wiai.uni-bamberg.de/mwstat/examples/wiki_1_weekly_network.swf.

  7. 7.

    Bitmap of sorted adjacency matrix.

  8. 8.

    At least I hope this is visible in the printout.

  9. 9.

    Where the timeline was presented column by column.

  10. 10.

    Which could be flipped e.g. for Arabic readers who may prefer right → left.

  11. 11.

    For example CLIQUE [2]. For an overview on cluster analysis see Everitt et al. [12].

  12. 12.

    For indices outside the time range (e.g. a  − 1) the value 0 is substituted.

  13. 13.

    Which are in fact very similar, see e.g. [23].

  14. 14.

    Multidimensional scaling (MDS, [21]) in several variants [10].

  15. 15.

    POVNA [35] is written in Java. Not all features described are included in the current stable release.

  16. 16.

    In-depth case studies of the wikis used here including other types of (not pixel-oriented) visualizations are provided by Stein and Blaschke [31].

  17. 17.

    This is less a problem in interactive usage where we can scroll.

  18. 18.

    We may also see that they never edited the wiki on weekends.

  19. 19.

    Wiki Explorator is written in Ruby using R, Gnuplot, Graphviz and other open source software.

  20. 20.

    http://wiki-explorator.rubyforge.org. We also provide an online wiki analysis service based on this library at http://www.kinf.wiai.uni-bamberg.de/mwstat.

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Acknowledgements

Part of this work was supported by the Volkswagenstiftung through Grant No. II/82 509.

We thank the reviewers for their helpful comments.

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Correspondence to Klaus Stein .

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Stein, K., Wegener, R., Schlieder, C. (2013). Pixel-Oriented Network Visualization: Static Visualization of Change in Social Networks. In: Özyer, T., Rokne, J., Wagner, G., Reuser, A. (eds) The Influence of Technology on Social Network Analysis and Mining. Lecture Notes in Social Networks, vol 6. Springer, Vienna. https://doi.org/10.1007/978-3-7091-1346-2_5

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