4 Performance evaluation
In this section, the results which we have been ob- tained for the NTCIR-4 Patent fs task and thier evalu- ation by the human expert are shown.
The organizers of the task provided five topics. For each topic, the relevant patent document and criteria for the horizontal and vertical axes of the matrix are given. We use only the summary part of a patent doc- ument that is written in Japanese, as the main part of the document consist of too many irrelevant words to the topic, that will cause the document vector to be dis- torted. Though the relevant patents for each topic are given by the organizer, the patents which neither in- cluded “problem to be solved” or “solutions” section in the summary are omitted. Topics are as follws:
Topic12. Composed from the patent docu- ments that are related to the “blue light-emitting diode”.The number of patent documents is 97.
Topic24. Composed from the patent documents that are related to “solid high-polymer-type fuel”. The number of patent documents is 98
Topic25 is composed from the patent documents that are related to “Ultra hydrophilizationof plas- tic surfaces”. The number of patent documents is 99