1,421 research outputs found
Solving the Cold-Start Problem in Recommender Systems with Social Tags
In this paper, based on the user-tag-object tripartite graphs, we propose a
recommendation algorithm, which considers social tags as an important role for
information retrieval. Besides its low cost of computational time, the
experiment results of two real-world data sets, \emph{Del.icio.us} and
\emph{MovieLens}, show it can enhance the algorithmic accuracy and diversity.
Especially, it can obtain more personalized recommendation results when users
have diverse topics of tags. In addition, the numerical results on the
dependence of algorithmic accuracy indicates that the proposed algorithm is
particularly effective for small degree objects, which reminds us of the
well-known \emph{cold-start} problem in recommender systems. Further empirical
study shows that the proposed algorithm can significantly solve this problem in
social tagging systems with heterogeneous object degree distributions
Tag-Aware Recommender Systems: A State-of-the-Art Survey
In the past decade, Social Tagging Systems have attracted increasing attention from both physical and computer science communities. Besides the underlying structure and dynamics of tagging systems, many efforts have been addressed to unify tagging information to reveal user behaviors and preferences, extract the latent semantic relations among items, make recommendations, and so on. Specifically, this article summarizes recent progress about tag-aware recommender systems, emphasizing on the contributions from three mainstream perspectives and approaches: network-based methods, tensor-based methods, and the topic-based methods. Finally, we outline some other tag-related studies and future challenges of tag-aware recommendation algorithm
Holographic Schwinger effect in spinning black hole backgrounds
We perform the potential analysis for the holographic Schwinger effect in
spinning Myers-Perry black holes. We compute the potential between the produced
pair by evaluating the classical action of a string attaching on a probe
D3-brane sitting at an intermediate position in the AdS bulk. It turns out that
increasing the angular momentum reduces the potential barrier thus enhancing
the Schwinger effect, consistent with previous findings obtained from the local
Lorentz transformation. In particular, these effects are more visible for the
particle pair lying in the transversal plane compared with that along the
longitudinal orientation. In addition, we discuss how the Schwinger effect
changes with the shear viscosity to entropy density ratio at strong coupling
under the influence of angular momentum.Comment: to be published in Chinese Physics
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