Profile National Institute of Informatics. Research group on text media and content. Back in the university, belonged to Electrical Engineering department and engaged in a research on formal specification and verification techniques for communication software. After the graduation of the PhD course, spent two years at University of Illinois at Urbana-Champaign as a visiting researcher, started working in knowledge engineering research field. Following several years, engaged in researches in soft optimization methods including genetic algorithms (GA). Inspired by the similarity between genes in GA and words in natural languages, current research goal is to pursue both the statistical and semantic nature of information transferred over text-based media. Now is working on such topics as information retrieval, natural language processing, web information analysis.