21,259 research outputs found
Implication of BaBar's new data on the and
The strong decays of the and are investigated
in the framework of the model. Its decay properties newly reported by
the BaBar Collaboration can be reasonably accounted for in the presence of the
being a mixture of the and . The
orthogonal partner of the is expected to have a mass of about
GeV in quark models and a width of about MeV in the
model. The predicted decay properties turn out to be consistent with
the BaBar's new data in both the orthogonal partner of the and
the interpretations for the . The available
experimental information is not enough to distinguish these two possibilities.
The radiative transitions of the and are
also studied. We tend to conclude that the can be identified as
a mixture of the and , and the
could be either the orthogonal partner of the or the . Further experimental information on the in the
, , and channels is needed.Comment: 13 pages, 2 figures, version accepted for publication in Phys. Rev.
The Nature of Novelty Detection
Sentence level novelty detection aims at reducing redundant sentences from a
sentence list. In the task, sentences appearing later in the list with no new
meanings are eliminated. Aiming at a better accuracy for detecting redundancy,
this paper reveals the nature of the novelty detection task currently
overlooked by the Novelty community Novelty as a combination of the partial
overlap (PO, two sentences sharing common facts) and complete overlap (CO, the
first sentence covers all the facts of the second sentence) relations. By
formalizing novelty detection as a combination of the two relations between
sentences, new viewpoints toward techniques dealing with Novelty are proposed.
Among the methods discussed, the similarity, overlap, pool and language
modeling approaches are commonly used. Furthermore, a novel approach, selected
pool method is provided, which is immediate following the nature of the task.
Experimental results obtained on all the three currently available novelty
datasets showed that selected pool is significantly better or no worse than the
current methods. Knowledge about the nature of the task also affects the
evaluation methodologies. We propose new evaluation measures for Novelty
according to the nature of the task, as well as possible directions for future
study.Comment: This paper pointed out the future direction for novelty detection
research. 37 pages, double spaced versio
Does Design-Build (DB) Outperform Construction Management at Risk (CMAR)? A cost and schedule comparative study of DB projects and CMAR projects
Design-Build (DB) and Construction Management at Risk (CMAR) are two
widely used alternative project delivery systems in the construction industry. Previous
studies have found inconclusive results on which of the two has better cost and schedule
performances when applied in construction projects. This study chose unit cost, change
order factor, cost growth, schedule growth, and construction intensity as the metrics to
measure the cost and schedule performance of both DB projects and CMAR projects. Two
statistical analysis tools, Analysis of Variance and Wilcoxon Signed Rank Test, were
applied to see if there is any difference between the two project delivery systems’ means
of the five measurements. The test results were used to determine which project delivery
system has better performance in the real world. The results showed that Design-Build is
superior to Construction Management at Risk in construction intensity, while Construction
Management at Risk has better performance on change order, cost growth, and schedule
growth. And there is no difference on unit cost
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