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includes direct and indirect similarities. Given a direct similarity matrix that represents a patent citation network, the method calculates indirect similarity matrices and then obtains a compound similarity matrix. Keyword analysis in the text mining is employed to obtain a similarity for a pair of patents. In addition, two
is obtained by keyword analysis for different time periods and research field maps. The integrated method is applied on etching technology which is a material processing technology particularly important for semiconductor industry. On the basis of the results obtained in the practice of etching technology, six different
for patent queries because the inherent search systems come from traditional keyword-based models, which inevitably lead to too many unrelated items in the search results. Consequently, these systems cost the patent experts lots of time to iteratively refine search results manually. In this paper, we propose a
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