Pseudo relevance feedback-based query expansion is a popular automatic query expansion technique. However, a survey of work done in the area shows that it has a mixed chance of success. This paper captures the limitat...
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Pseudo relevance feedback-based query expansion is a popular automatic query expansion technique. However, a survey of work done in the area shows that it has a mixed chance of success. This paper captures the limitations of pseudo relevance feedback (PRF)-based query expansion and proposes a method of enhancing its performance by hybridizing corpus-based information, with a geneticfuzzy approach and semantic similarity notion. First the paper suggests use of a geneticfuzzy approach to select an optimal combination of query terms from a pool of terms obtained using PRF-based query expansion. The query terms obtained are further ranked on the basis of semantic similarity with original query terms. The experiments were performed on CISI collection, a benchmark dataset for information retrieval. It was found that the results were better in both terms of recall and precision. The main observation is that the hybridization of various techniques of query expansion in an intelligent way allows us to incorporate the good features of all of them. As this is a preliminary attempt in this direction, there is a large scope for enhancing these techniques.
Pressure controlled object of distilling tower iscomplicated, has more effective factors and strong interference, itsmodeling is difficult, so normal control algorithm can't control itwith satisfactory, quality. T...
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Pressure controlled object of distilling tower iscomplicated, has more effective factors and strong interference, itsmodeling is difficult, so normal control algorithm can't control itwith satisfactory, quality. To overcome this difficult, a kind ofgenetic fuzzy algorithm is put forward. While fuzzy logic mimicsthe human's imprecise reasoning, the geneticalgorithm mimics theevolution of the nature, an optimum point always can be found bythe genetic fuzzy algorithm. Experimental result proves that, eventhrough there is strong interference, the algorithm still can ensureactual pressure value to fellow the given pressure value quicklyand steadily,
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