476 research outputs found
Likelihood Adaptively Modified Penalties
A new family of penalty functions, adaptive to likelihood, is introduced for
model selection in general regression models. It arises naturally through
assuming certain types of prior distribution on the regression parameters. To
study stability properties of the penalized maximum likelihood estimator, two
types of asymptotic stability are defined. Theoretical properties, including
the parameter estimation consistency, model selection consistency, and
asymptotic stability, are established under suitable regularity conditions. An
efficient coordinate-descent algorithm is proposed. Simulation results and real
data analysis show that the proposed method has competitive performance in
comparison with existing ones.Comment: 42 pages, 4 figure
Bilateral abducens nerve palsy in an infant case of fulminant acute disseminated encephalomyelitis: a case report
Supernova Neutrino in a Strangeon Star Model
The neutrino burst detected during supernova SN1987A is explained in a
strangeon star model, in which it is proposed that a pulsar-like compact object
is composed of strangeons (strangeon: an abbreviation of "strange nucleon"). A
nascent strangeon star's initial internal energy is calculated, with the
inclusion of pion excitation (energy around 10^53 erg, comparable to the
gravitational binding energy of a collapsed core). A liquid-solid phase
transition at temperature ~ 1-2 MeV may occur only a few ten-seconds after
core-collapse, and the thermal evolution of strangeon star is then modeled. It
is found that the neutrino burst observed from SN 1987A could be re-produced in
such a cooling model.Comment: 15 pages, 7 figures, 1 tabe
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