13,216 research outputs found
Structured variable selection and estimation
In linear regression problems with related predictors, it is desirable to do
variable selection and estimation by maintaining the hierarchical or structural
relationships among predictors. In this paper we propose non-negative garrote
methods that can naturally incorporate such relationships defined through
effect heredity principles or marginality principles. We show that the methods
are very easy to compute and enjoy nice theoretical properties. We also show
that the methods can be easily extended to deal with more general regression
problems such as generalized linear models. Simulations and real examples are
used to illustrate the merits of the proposed methods.Comment: Published in at http://dx.doi.org/10.1214/09-AOAS254 the Annals of
Applied Statistics (http://www.imstat.org/aoas/) by the Institute of
Mathematical Statistics (http://www.imstat.org
Computational Simulation and 3D Virtual Reality Engineering Tools for Dynamical Modeling and Imaging of Composite Nanomaterials
An adventure at engineering design and modeling is possible with a Virtual
Reality Environment (VRE) that uses multiple computer-generated media to let a
user experience situations that are temporally and spatially prohibiting. In
this paper, an approach to developing some advanced architecture and modeling
tools is presented to allow multiple frameworks work together while being
shielded from the application program. This architecture is being developed in
a framework of workbench interactive tools for next generation
nanoparticle-reinforced damping/dynamic systems. Through the use of system, an
engineer/programmer can respectively concentrate on tailoring an engineering
design concept of novel system and the application software design while using
existing databases/software outputs.Comment: Submitted on behalf of TIMA Editions
(http://irevues.inist.fr/tima-editions
photoproduction on the quasi-free nucleons in the chiral quark model
A chiral quark-model approach is adopted to study the photoproduction
off the quasi-free neutron and proton from a deuteron target. Good descriptions
of the differential cross sections, total cross sections and beam asymmetries
for these two processes are obtained in the low energy region. For , the dominant resonances are ,
, , and . While for
the process, the dominant resonances are
, , , and
. Furthermore, the channel backgrounds have significant
contributions to the photoproduction processes. The configuration
mixings in the and can be extracted,
i.e. and . It shows that the
narrow bump-like structure around GeV observed in can be naturally explained by the constructive
interferences between and . In contrast, the
destructive interference between and produces the
shallow dip around GeV in . The wave
interfering behaviors in the proton and neutron reactions are correlated with
each other in the quark model framework, and no new exotic nucleon resonances
are needed in these two reactions.Comment: 12 pages, 11 figures, helicity amplitudes are added, to be published
in PR
On Random Walks with a General Moving Barrier
Random walks with a general, nonlinear barrier have found recent applications
ranging from reionization topology to refinements in the excursion set theory
of halos. Here, we derive the first-crossing distribution of random walks with
a moving barrier of an arbitrary shape. Such a distribution is shown to satisfy
an integral equation that can be solved by a simple matrix inversion, without
the need for Monte Carlo simulations, making this useful for exploring a large
parameter space. We discuss examples in which common analytic approximations
fail, a failure which can be remedied using the method described here.Comment: 6 pages, 7 figures, submitted to Ap
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