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system enables us to explore temporal changes in networks and
characteristics of relationships.
Four methods which use animation, a timeline in 3D, tiled views, and
overlaying views, have been proposed that have enabled the evolution of
information structures to become visualized [9][15][16][17][18]. Our
system integrates these techniques into a 3D environment to avoid
limitations of each method. The ViENA project provides prototypes that
integrate these four methods to analyse visually dynamic networks
including social networks [19][20]. Unlike their system, our system
enables us to visualize changes in the structure of network and changes in
characteristics of each connection between nodes. Erten et al. [21]
proposed methods for visualizing a series of related graphs, which shared
all or parts of the same nodes, to compare them. Their method could treat
time sequential graphs as simultaneous graphs. However, they did not
provide an interface to support the exploration of temporal changes in
graphs. It was also difficult to represent time sequential graphs for
multiple topics.
9 Conclusion
The objective of this research was to provide tools for visualizing a large
number of historical and chronological documents to support searches for
new knowledge. We have proposed a framework for visualizing time
varying structural changes in networks of historical figures and for
visualizing characteristics of relationships between them extracted from
records about their activities.
The historical events from 1560 to 1580 were used as a case study for
extracting clusters representing characteristics of relationships. Temporal
data expansion is the next stage of study, to extract clusters from the
Sengoku Jidai (from around 1450) to the early stage of the Edo period
(around 1650).
In future work we plan to evaluate the effectiveness of our system with
expert historians. We will try to check that our system can visualize
already-known knowledge and can extract new knowledge such as
different activities from well-known knowledge about particular people or
unexpected relationships between people.
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