Shigeo Shimada

Learn More
This paper presents the information retrieval system that integrates concept-based retrieval, which focuses on the similarity of the meanings of words, with the characterstring-matching-based retrieval. The system provides a word association function, a concept retrieval function, and a document classification function, which are expected to help the user(More)
Two Lithium ion battery systems have already installed at practical traction substations, HAIJIMA SS and OKEGAWA SS, to utilize regenerative energy in d.c. 1.5kV traction power supply system of East Japan Railway Company. In this paper, the effect of energy storage system for energy saving by making use of regenerative energy is evaluated in detail.(More)
  • 1