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Performance issues and error analysis in an open-domain question answering system
Dan Moldovan, Marius Paşca, Sanda Harabagiu, Mihai Surdeanu
This paper presents an in-depth analysis of a state-of-the-art Question Answering system. Several scenarios are examined: (1) the performance of each module in a serial baseline system, (2) the impact of feedbacks and the insertion of a logic prover,...
A hierarchical access control model for video database systems
Elisa Bertino, Jianping Fan, Elena Ferrari, Mohand-Said Hacid, Ahmed K. Elmagarmid, Xingquan Zhu
Content-based video database access control is becoming very important, but it depends on the progresses of the following related research issues: (a) efficient video analysis for supporting semantic visual concept representation; (b) effective video...
Region proximity in metric spaces and its use for approximate similarity search
Giuseppe Amato, Fausto Rabitti, Pasquale Savino, Pavel Zezula
Similarity search structures for metric data typically bound object partitions by ball regions. Since regions can overlap, a relevant issue is to estimate the proximity of regions in order to predict the number of objects in the regions'...