Keyphrases
- carnegie mellon university
- information retrieval
- retrieval effectiveness
- social media
- question answering
- test collection
- clef ip
- e learning
- case study
- biomedical information retrieval
- classifier systems
- engineering students
- patent retrieval
- pseudo relevance feedback
- social influence
- information propagation
- relevance feedback
- stanford university
- social networks
- neural network