Recently, we updated our academic map in Academic Map , in which a cycle means a paper and a link between cycles means the citation and reference relation. Generally it has 13 different layers, in each of which you can see different views of the Academic Map. At the same time, we use different color to identify the papers that have different fields.
In our previous academic map, we mainly use Gephi to produce our maps. It has some limitations: Gephi can not handle big data layout problem(up to 0.4M), so we must separate our data into several parts according to their fields and visualize them individually. But there are lots of papers that belong to several fields, so it will cause ambiguity. At the same time, we can not represent the relation among fields using the layout of the fields.
The generation of the layout of the new graph is done using an N-body simulation similar to that used to simulate galaxy formation in astrophysics. Computing is naively an N^2 operation, and this calculation dominates each iteration of the simulation. In order to make it run at reasonable speed the Barnes-Hut algorithm is used. At each iteration a quad-tree is built out of all the nodes (taking order N log N time) and then this quad-tree is used to compute an approximation (taking order N log N time again).
How to use
The top layer show the relation between field. For instance, you will find Mathematics and Computer Science share some similarities and highly influence each other.
The bottom layer show the relation between several papers that you want. The color of link means when the citation relation was established. And the redius of paper means the influence of the paper(the more citation the paper has, the larger the radius will be).
If you want to search the information of a particular paper, just click on it. Then you will see some extra information of the paper including the title, the author, citation count, reference count and so on.
You can also search where the related papers are by clicking the citation link or reference link.
See more details in Academic Map. If you have any question or advice, please contact Wjerry5@sjtu.edu.cn