VISUALIZATION FOR CHANGES IN RELATIONSHIPS BETWEEN HISTORICAL FIGURES IN CHRONICLES - Information Visualisation: Techniques, Usability and Evaluation - page 148

Year Cluster name : frequency
1574 Battle: 2, Allowance: 1, Unknown: 1
1575 Battle: 5, Unknown: 1
1576 Peace: 1
Table 8.2. Clusters and frequencies for the edge between ODA Nobunaga and
TAKEDA Katsuyori in each year
6 Visualization of Changes in Relationships
between Historical Figures
The proposed visualization system allows interaction in exploration of
time varying changes in the structure of person dependency networks and
changes in characteristics of relationships among historical figures.
6.1 Visualizing Changes in Structure
TimeSlice [6] is used as a platform for visualizing temporal changes in the
structure of a network in a 3D space. It is used here for visualizing
networks of people extracted as described in Section 4.
A TimeSlice is a 2D plane for visualizing a snapshot of a network with
a specified timing (Figure 8.3), and implemented as a component of the
IntelligentBox system [13]. IntelligentBox is a component-based visual
software development system for interactive 3D graphics applications.
A given TimeSlice displays only the network belonging to a selected
year. It can be dragged along a timeline, represented by the third
dimension. Users can seamlessly change the positions of the TimeSlice
along the timeline to change the year being visualized. Such manipulation
generates an animated temporal change in the structure of a network.
Each node in the network on a TimeSlice represents a person, and each
edge represents a person dependency. Figure 8.4 shows the directed edge
from MIYOSHI Yasunaga 5 to ODA Nobunaga, and the bidirectional edge
between TOKUGAWA Ieyasu and ODA Nobunaga. The size of nodes
represents the attraction power of people, and the colours of nodes
represent the ratio of the number of in-links to out-links of the nodes
described in Section 4. Suitable edge length is defined by the difference in
person dependencies as described in Section 4. However, the layout
algorithm, which is described below, defines the final length of edges.
5. MIYOSHI Yasunaga was a military commander who fought against Nobunaga.