Keyphrases
- information retrieval
- test collection
- question answering
- video clips
- social media
- retrieval effectiveness
- topic detection and tracking
- hot topics
- topic detection
- pseudo relevance feedback
- social networks
- low level features
- relevance feedback
- high level
- biomedical information retrieval
- evaluation campaigns
- document rankings
- expert search
- ir evaluation
- reuters corpus volume
- blog opinion retrieval
- information propagation
- ad hoc retrieval
- social influence
- relevant documents