17 research outputs found
Decay of correlations for maps with uniformly contracting fibers and logarithm law for singular hyperbolic attractors
We consider two dimensional maps preserving a foliation which is uniformly
contracting and a one dimensional associated quotient map having exponential
convergence to equilibrium (iterates of Lebesgue measure converge exponentially
fast to physical measure). We prove that these maps have exponential decay of
correlations over a large class of observables. We use this result to deduce
exponential decay of correlations for the Poincare maps of a large class of
singular hyperbolic flows. From this we deduce logarithm laws for these flows.Comment: 39 pages; 03 figures; proof of Theorem 1 corrected; many typos
corrected; improvements on the statements and comments suggested by a
referee. Keywords: singular flows, singular-hyperbolic attractor, exponential
decay of correlations, exact dimensionality, logarithm la
TB-Structure : Collective Intelligence for Exploratory Keyword Search
In this paper we address an exploratory search challenge by presenting a
new (structure-driven) collaborative filtering technique. The aim is to increase search effectiveness
by predicting implicit seeker’s intents at an early stage of the search process. This is
achieved by uncovering behavioral patterns within large datasets of preserved collective search
experience. We apply a specific tree-based data structure called a TB (There-and-Back) structure
for compact storage of search history in the form of merged query trails – sequences of
queries approaching iteratively a seeker’s goal. The organization of TB-structures allows inferring
new implicit trails for the prediction of a seeker’s intents. We used experiments to demonstrate
both: the storage compactness and inference potential of the proposed structure.peerReviewe