In Chinese question answering system, because there is more semantic relation in questions than that in query words, the precision can be improved by expanding query while using natural language questions to retrieve ...In Chinese question answering system, because there is more semantic relation in questions than that in query words, the precision can be improved by expanding query while using natural language questions to retrieve documents. This paper proposes a new approach to query expansion based on semantics and statistics Firstly automatic relevance feedback method is used to generate a candidate expansion word set. Then the expanded query words are selected from the set based on the semantic similarity and seman- tic relevancy between the candidate words and the original words. Experiments show the new approach is effective for Web retrieval and out-performs the conventional expansion approaches.展开更多
Happiness may be'U-shaped,'but a recent survey suggests that,despite their problems,the Chinese may be the world’s leading optimists.In'What Worries the World,'a study by global market-research firm I...Happiness may be'U-shaped,'but a recent survey suggests that,despite their problems,the Chinese may be the world’s leading optimists.In'What Worries the World,'a study by global market-research firm Ipsos,87 percent of Chinese adults said their country was'heading in the right direction,'while 60 percent of citizens of 25 other surveyed countries considered theirs on the wane.Western Europe and other high-income nations—where contentment is said to decline between ages 18 and 40展开更多
基金the Specialized Research Program Fundthe Doctoral Program of Higher Education of China (20050007023)the Natural Science Foundation of Shandong Province(Y2004G04)
文摘In Chinese question answering system, because there is more semantic relation in questions than that in query words, the precision can be improved by expanding query while using natural language questions to retrieve documents. This paper proposes a new approach to query expansion based on semantics and statistics Firstly automatic relevance feedback method is used to generate a candidate expansion word set. Then the expanded query words are selected from the set based on the semantic similarity and seman- tic relevancy between the candidate words and the original words. Experiments show the new approach is effective for Web retrieval and out-performs the conventional expansion approaches.
文摘Happiness may be'U-shaped,'but a recent survey suggests that,despite their problems,the Chinese may be the world’s leading optimists.In'What Worries the World,'a study by global market-research firm Ipsos,87 percent of Chinese adults said their country was'heading in the right direction,'while 60 percent of citizens of 25 other surveyed countries considered theirs on the wane.Western Europe and other high-income nations—where contentment is said to decline between ages 18 and 40
