Keyphrases
- lower bound
- upper bound
- database
- query processing
- query evaluation
- wide range
- branch and bound
- keywords
- response time
- user interaction
- data sources
- user queries
- constant factor
- query execution
- retrieval method
- relevance feedback
- optimal solution
- retrieval systems
- query expansion
- worst case
- range data
- branch and bound algorithm
- indexing techniques
- database queries
- minimum cost
- result set
- complex queries
- query interface
- similarity measure