Keyphrases
- information retrieval
- test collection
- case study
- clef ip
- question answering
- retrieval effectiveness
- e learning
- scientific databases
- stanford university
- okapi bm
- san francisco
- partial replication
- video sequences
- digital libraries
- pseudo relevance feedback
- real time tracking
- ad hoc retrieval
- question answering systems
- expert search
- neural network