6,548 research outputs found
Combination of Multiple Bipartite Ranking for Web Content Quality Evaluation
Web content quality estimation is crucial to various web content processing
applications. Our previous work applied Bagging + C4.5 to achive the best
results on the ECML/PKDD Discovery Challenge 2010, which is the comibination of
many point-wise rankinig models. In this paper, we combine multiple pair-wise
bipartite ranking learner to solve the multi-partite ranking problems for the
web quality estimation. In encoding stage, we present the ternary encoding and
the binary coding extending each rank value to (L is the number of the
different ranking value). For the decoding, we discuss the combination of
multiple ranking results from multiple bipartite ranking models with the
predefined weighting and the adaptive weighting. The experiments on ECML/PKDD
2010 Discovery Challenge datasets show that \textit{binary coding} +
\textit{predefined weighting} yields the highest performance in all four
combinations and furthermore it is better than the best results reported in
ECML/PKDD 2010 Discovery Challenge competition.Comment: 17 pages, 8 figures, 2 table
The study of light invisible particles in decays
In this paper, we study the light scalar and pseudoscalar invisible particles
in the flavor changing neutral current processes of the meson. Effective
operators are introduced to describe the couplings between quarks and light
invisible particles. The Wilson coefficients are extracted from the
experimental results of the and mesons, which are used to predict the
upper limits of the branching fractions of the similar decay processes for the
meson. The hadronic transition matrix element is calculated with the
instantaneously approximated Bethe-Salpeter method. The upper limits of the
branching fractions when taking different values are presented. It is
found that at some region of , the channel has the largest upper limit which is of the order of
, and for , the largest value of the
upper limits can achieve the order of . Other decay modes, such as
and ,
are also considered.Comment: 24 pages, 35 figure
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