Keyphrases
- relevance feedback
- response time
- query processing
- query evaluation
- database
- query expansion
- user queries
- keywords
- communication cost
- user defined
- retrieval systems
- worst case
- complex queries
- query execution
- neural network
- object retrieval
- query formulation
- original query
- range queries
- query terms
- data sources
- query language
- dynamic programming
- search engine
- learning algorithm
- information retrieval
- databases