... words oftheir original form, while they should be ofdifferent forms in different contexts. We exploitmorphology for this purpose, and expand eachword to all possible forms. For instance,inflections ... labelled all 964 sentences, weperformed the sentence retrieval module on thesentence set, that is, PENS retrieved examplesentences for each of the 50 queries. Therefore, for each query, we compared ... PAT-Tree-Based AdaptiveKeyphrase Extraction for Intelligent ChineseInformation Retrieval. Special issue on“Information Retrieval with Asian Language”Information Processing and Management, 1998.PENS:...