Keyphrases
- average precision
- response time
- database
- query processing
- retrieval precision
- user queries
- information extraction
- relevance feedback
- boolean queries
- query expansion
- query formulation
- complex queries
- precision and recall
- recall precision
- retrieval accuracy
- automatic extraction
- search queries
- vector space
- data sources
- data structure
- communication cost
- range queries
- result set
- query execution
- retrieval systems
- efficient processing
- search engine
- databases