Keyphrases
- lower bound
- upper bound
- database
- response time
- query evaluation
- query processing
- user queries
- query expansion
- data structure
- branch and bound algorithm
- range queries
- relevance feedback
- data sources
- objective function
- query formulation
- np hard
- indexing techniques
- lower and upper bounds
- keywords
- branch and bound
- combinatorial optimization
- retrieval method
- data warehouse