With the current technology of Information Retrieval, this paper proposes a method of automatic keyword extraction from massive data sets based on feature combination.
本文利用现有的信息检索技术，对海量数据集上自动抽取关键词问题进行了研究，给出了一个基于特征组合的关键词自动抽取方法。
Because human evaluation is time-consuming, we propose a new citation-based method for automatic evaluation of patent information retrieval.
专利信息是集技术、法律、经济信息于一体的综合性信息源。
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