3,717 research outputs found
Neural Networks Architecture Evaluation in a Quantum Computer
In this work, we propose a quantum algorithm to evaluate neural networks
architectures named Quantum Neural Network Architecture Evaluation (QNNAE). The
proposed algorithm is based on a quantum associative memory and the learning
algorithm for artificial neural networks. Unlike conventional algorithms for
evaluating neural network architectures, QNNAE does not depend on
initialization of weights. The proposed algorithm has a binary output and
results in 0 with probability proportional to the performance of the network.
And its computational cost is equal to the computational cost to train a neural
network
Drifting diffusion on a circle as continuous limit of a multiurn Ehrenfest model
We study the continuous limit of a multibox Erhenfest urn model proposed
before by the authors. The evolution of the resulting continuous system is
governed by a differential equation, which describes a diffusion process on a
circle with a nonzero drifting velocity. The short time behavior of this
diffusion process is obtained directly by solving the equation, while the long
time behavior is derived using the Poisson summation formula. They reproduce
the previous results in the large (number of boxes) limit. We also discuss
the connection between this diffusion equation and the Schrdinger
equation of some quantum mechanical problems.Comment: 4 pages prevtex4 file, 1 eps figur
Lumped-Parameter Model and Nonlinear DSSI Analysis
A 2-.degrees-of-freedom discrete model with 8 constant lumped parameters is developed to equivalently simulate frequency-dependent dynamic impedances of the elastic halfspace. The equations of motion for the nonlinear dynamic soil-structure interaction (DSSI) analysis are established in the time domain and then nonlinear seismic responses of the coupling system are predicted by the proposed iterative procedure. Based on numerical results for three typical shear-type structures, effects of the shear stiffness of underlying soils and different ground motions on dynamic responses are examined
Early hospital readmissions post‐kidney transplantation are associated with inferior clinical outcomes
Unplanned hospital readmissions are common early post‐kidney transplantation. We investigated the relationship between early hospital readmissions and clinical outcomes in a single‐center retrospective study that included all adult kidney transplant patients between 2004 and 2008 with follow‐up to December 2012. The early hospital readmissions within the first 30 d were numbered and the diagnosis ascertained. Patients were grouped as none, once, and twice or more readmissions. Predictors of early readmissions were assessed, and clinical outcomes and patient and death‐censored kidney survival were compared. Among 1064 patients, 203 (19.1%) patients had once and 83 (7.8%) patients had twice or more readmissions within 30 d. Surgical complications, infections, and acute kidney injuries/acute rejection were three most common diagnoses. The length of initial hospital stay and African American race were among the variables associated significantly with readmissions. Patients with early readmissions had lower baseline renal function (p < 0.01) and more early acute rejection (p < 0.01). During follow‐up, only frequent readmissions, twice or more, within 30 d were associated with increased risk of death ( AHR 1.75, p = 0.01) and death‐censored kidney failure ( AHR 2.20, p < 0.01). Frequent early hospital readmissions post‐transplantation identify patients at risk for poor long‐term outcomes, and more studies are needed to understand the mechanisms.Peer Reviewedhttp://deepblue.lib.umich.edu/bitstream/2027.42/106830/1/ctr12347.pd
A Melnikov analysis on a class of second order discontinuous differential equations
This paper focuses in providing a Melnikov-like function that controls the
existence of periodic solutions bifurcating from period annuli present in some
families of the second-order discontinuous differential equation given by
. This
family has garnered extensive attention from various researchers, especially
when considering specific instances of . The interest in
studying this type of differential equation is due to its relevance in modeling
systems with abrupt state changes in both natural and engineering contexts
Effects of Dehydration on Freezing Characteristics and Survival in Liquid Nitrogen of Three Recalcitrant Seeds
The recalcitrant seeds rambutan( Nephelium lappaceum). durian (Durio zibethinus) and cempedak
(Artocarpus inleger) have a high critical moisture content (below which ·rapid loss of viability occurs of
27.0%, 26.0% and 37.9%,respectively. The critical moisture for embroys were higher at 39.0%
for rambutan, 53.9% for durian and 43.2% for Cempedak. Differential Thermal analysis of the embroyos
confirmed that their threshhold moistures (below which there is no freezable water) were lower than their critical
moistureS. The Threshhold moistures for rambutan, durian and cempedak embryos were approximately 30%,
32% and 33% respectively. It is suggested that unsuccessful attempts at cryopreservation of embroyos of
'recalcitrant seeds in the past maybe due to the absence of safe window between the high critical moisture
content and the threshhold moisture. This results in freezing injury at the higher moistures and dehydration
injury' at the lower moistures. Potential techniques to overcome this and improve cryopreservation of recalcitrant
seed embryos are discussed
Invariant tori and boundedness of solutions of non-smooth oscillators with Lebesgue integrable forcing term
Since Littlewood works in the 1960's, the boundedness of solutions of
Duffing-type equations has been extensively investigated.
More recently, some researches have focused on the family of non-smooth forced
oscillators , mainly because it represents a
simple limit scenario of Duffing-type equations for when is bounded. Here,
we provide a simple proof for the boundedness of solutions of the non-smooth
forced oscillator in the case that the forcing term is a -periodic
Lebesgue integrable function with vanishing average. We reach this result by
constructing a sequence of invariant tori whose union of their interiors covers
all the -space,
Desiccation and Cryopreservation of Embryonic Axes of Hevea brasiliensis Muell. - Arg.
Hevea embryonic axes were desiccated for a period of 1 - 5 hours and the moisture content was
determined at the end of each hour of desiccation. Another set of embryonic axes were aseptically
desiccated for the same period before they were cryopreserved for 16 hours by direct immersion in
liquid nitrogen (-196°C). At a moisture content between 14 - 20% (desiccation for 2 - 5 hours),
20 - 69% of the embryonic axes survived cryopreservation and formed seedlings with normal roots
and shoots when cultured in vitro. A bnormalities were deteched in some seedlings however, hence,
refinement of the technique is needed
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