Advances in Information Retrieval: 35th European Conference by Aleksandr Chuklin, Pavel Serdyukov, Maarten de Rijke

By Aleksandr Chuklin, Pavel Serdyukov, Maarten de Rijke (auth.), Pavel Serdyukov, Pavel Braslavski, Sergei O. Kuznetsov, Jaap Kamps, Stefan Rüger, Eugene Agichtein, Ilya Segalovich, Emine Yilmaz (eds.)

This ebook constitutes the lawsuits of the thirty fifth ecu convention on IR learn, ECIR 2013, held in Moscow, Russia, in March 2013. The fifty five complete papers, 38 poster papers and 10 demonstrations offered during this quantity have been rigorously reviewed and chosen from 287 submissions. The papers are equipped within the following topical sections: consumer features; multimedia and cross-media IR; information mining; IR conception and formal versions; IR procedure architectures; type; net; occasion detection; temporal IR, and microblog seek. additionally incorporated are four educational and a couple of workshop presentations.

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Extra info for Advances in Information Retrieval: 35th European Conference on IR Research, ECIR 2013, Moscow, Russia, March 24-27, 2013. Proceedings

Example text

We use I j to denote a hidden variable representing the intent for this session. M-step. At the M-step we estimate the vector of parameters θ from the previous estimation θt : P (Y = y | X, θt ) log P (X, Y | θ) , θt+1 = arg max θ (11) y where X and Y denote the sets of observed and hidden variables respectively. In our case: N 10 I(djk = u) (qAk (0, i) log(1 − a) + qAk (1, i) log a) + log P (a) aiu = arg max a j=1 k=1 N 10 I(djk = u, Gjk = b, P revClick = d) γkd (b, i) = arg max γ j=1 k=1 (qEk (0, i) log(1 − γ) + qEk (1, i) log γ) + log P (γ) where P (a), P (γ) are beta priors and qAk , qEk are calculated during the E-step.

When the cognitive events to be measured occur slowly, they can be measured in real-time through fMRI. In contrast, short time scale events may cause evoked fMRI signals to overlap, increasing the difficulty of determining individual events [18]. The design of the fMRI study itself may also alter the task context. For instance, the study employs a basic fMRI block-design that has proven useful in the detection of small differences in the BOLD signals between contrasting events [16]. However, one drawback of the block-design is that it is hard to ensure the average response to a trial-type is not biased by a specific context or history of preceding types [16].

When the cognitive events to be measured occur slowly, they can be measured in real-time through fMRI. In contrast, short time scale events may cause evoked fMRI signals to overlap, increasing the difficulty of determining individual events [18]. The design of the fMRI study itself may also alter the task context. For instance, the study employs a basic fMRI block-design that has proven useful in the detection of small differences in the BOLD signals between contrasting events [16]. However, one drawback of the block-design is that it is hard to ensure the average response to a trial-type is not biased by a specific context or history of preceding types [16].

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