The evaluation of the Fukushima Daiichi accident documents using keyword visualization

It is important for decision-making of companies or countries to acquire knowledge from a lot of documents. The analysis of the frequency of worlds and the co-occurrence of world pairs are the main strategy of document analysis in many cases. We propose the visualization interface of documents for the purpose of grasping how topics change in time series. In our visualization system, 'Stream Graph' visualizes the frequency of worlds, 'Word Graph' visualized the co-occurrence of wold pairs, and two graphs are placed in the same display. (author)