IRIS (1978-2006)

Historical Reflection through Visual Analysis Co-authors:

Judith Molka-Danielsen (Molde University College, Norway)Matthias Trier (Technical University of Berlin, Germany)Vadim Shlyk (Technical University of Berlin, Germany)Annette Bobrik (Technical University of Berlin, Germany)Markku I. Nurminen (Turku University, Finland)

IRIS (Information Systems Research in Scandinavia) Conference is an annual meeting for researchers in Scandinavia. A social network of co-authorships and general research collaboration has emerged.

The complete IRIS 1978-2006 author and co-author relationship network. 

Goals of the analysis: – aggregate global network

measures – dynamically visualize the co-

authorship network development over selected time periods

– identify and visualize the most prominent actors over time and their  ego-networks

– capture the nature and characteristic of the research topics over time through visualizing  the network of keywords found in the conference paper titles.

Top Paper Count: Subset of 256 actors with a minimum of three contributed papers.

Ole HansethKarl Heinz Kautz

Carsten SørensenLars Mathiassen

Markku Nurminen

Lars Svensson

Kristin Braa

Pertti Järvinen

Peter Axel Nielsen

Per Flensburg

AuthorPaper count

Mathiassen 29

Nurminen 23

Järvinen 22

Sørensen 21

Flensburg 19

Kautz 19

Nielsen 17

Svensson 17

Nuldén 15

Hanseth 15

Urban Nuldén

Top Co-author count

Ole HansethKarl Heinz Kautz

Carsten SørensenLars Mathiassen

Markku Nurminen

Lars Svensson

Per Flensburg

Author

Co-author Count

Nurminen 36

Mathiassen 25

Svensson 20

Sørensen 20

Hanseth 19

Kautz 18

Savolainen 17

Goldkuhl 15

Jakobsson 16

Flensburg 16

Göran Goldkuhl

Matti JakobssonVesa Savolainen

Betweenness Centrality – creators of small worlds

Ole HansethKarl Heinz Kautz

Carsten SørensenLars Mathiassen

Markku Nurminen

Lars Svensson

Kristin Braa

Author

Between-ness

Centrality

Nurminen 31.29%

Braa 23.32%

Hanseth 18.46%

Kautz 17.54%

Sørensen 16.69%

Mathiassen 15.63%

Greenbaum 15.09%

Svensson 14.15%

Heikkilä 10.16%

Holmström 8.46%

Jukka Heikkilä

Jonny Holmström

Joan Greenbaum

Who works together?

The 256 most active authors are colored due to the country they come from:

light blue: Finlandblue: Norway yellow: Swedenred: Denmark green: non-Scandinavian

All authors from one Country

Total paper count

Sweden 574

Finland 424

Denmark 232

Norway 194

Time in Reverse: degrees of separation in time

2007 Papers are shown in color

Video of the forward evolving network.

Combined ego-network among the top 5 active authors: includes 84 authors in 198 relationships. The lighter nodes represents those top 5 central persons. Interestingly, only two of the top6-top10 active actors are found in direct relationship to the top5. The rest are positioned in different sectors of the network meaning that several independent collaborations arise. 12-Markku Nurminen

4- Pertti Järvinen

30-Per Flensburg

58-Lars Mathiassen

160-Carsten Sørensen

Active Period Author

Paper Count

83-04 L. Mathiassen 29

78-02 M. I. Nurminen 23

78-06 P. Järvinen 22

89-03 C. Sørensen 21

81-06 P. Flensburg 19

90-05 K. H. Kautz 19

86-05 P. A. Nielsen 17

97-06 L.Svensson 17

94-06 U. Nuldén 15

91-06 O. Hanseth 15

Ego-network among the top 5 central authors first vs. last years. Node 12 was central in 1st period. Node 58 in 2nd. Node 160 was in a very small peripheral component, but was very central position starting in 1993. Node 343 is the most connected node in 4th period had a first co-authorship link in 1997. There are obvious lifecycles of activity. Although three out of the top five authors have never collaborated directly, their respective groups of co-authors remain very separated.

12-Markku Nurminen4- Pertti Järvinen

30-Per Flensburg

58-Lars Mathiassen160-Carsten Sørensen 160

58

124

30

343-Lars Svensson

Line Charts of keyword occurrence (%) (trends) across time: decreases noticeably over time. This highlights reduced coverage of the selected top twenty and indicates increased pluralism and heterogeneity: The few initial topics differentiate.

•Co-authors, who employed the term information (1978-2006) in their papers, indicating the spread of these terms over time. •Co-authors, who employed the term knowledge (1985-2006) in their papers, indicating the spread of these terms over time.

The IRIS co-authors network 1978-2007

Summary: A major benefit of dynamic visualization is the abilty to examine the network relationships at different scale and from different perspectives.