458 research outputs found
PIXOR: Real-time 3D Object Detection from Point Clouds
We address the problem of real-time 3D object detection from point clouds in
the context of autonomous driving. Computation speed is critical as detection
is a necessary component for safety. Existing approaches are, however,
expensive in computation due to high dimensionality of point clouds. We utilize
the 3D data more efficiently by representing the scene from the Bird's Eye View
(BEV), and propose PIXOR, a proposal-free, single-stage detector that outputs
oriented 3D object estimates decoded from pixel-wise neural network
predictions. The input representation, network architecture, and model
optimization are especially designed to balance high accuracy and real-time
efficiency. We validate PIXOR on two datasets: the KITTI BEV object detection
benchmark, and a large-scale 3D vehicle detection benchmark. In both datasets
we show that the proposed detector surpasses other state-of-the-art methods
notably in terms of Average Precision (AP), while still runs at >28 FPS.Comment: Update of CVPR2018 paper: correct timing, fix typos, add
acknowledgemen
An Algorithm Based on Wavelet Neural Network for Garment Size Selection
Size fitting problem is a main obstacle to large scale online garment sales.It is the difficult to customers to find the fit garments when they couldn’t try on. In this paper, we present an algorithm base on wavelet neural network to help customer choosing their clothing specifications automatically. After the reasonable wavelet function is selected, we established the model structure and the initial parameters. The wavelet neural network is trained by the body measures and the result of AHP algorithm after normalization. The new data are used to test the network. As a result, the error from wavelet neural network is smaller, and the prediction accuracy is proved than that from the algorithm based on traditional BP network
Global solutions and large time behavior for some Oldroyd-B type models in
In this paper, we are concerned with global solutions to the co-rotation
Oldroyd-B type model and large time behavior for the general Oldroyd-B type
model. We first establish the energy estimate and B-K-M criterion for the 2-D
co-rotation Oldroyd-B type model. Then, we obtain global solutions by proving
the boundedness of vorticity. In general case, we apply Fourier spiltting
method to prove the decay rate for global solutions constructed by
T.M.Elgindi and F.Rousset
Large time behavior to a 2D micro-macro model for compressible polymeric fluids near equilibrium
In this paper, we mainly study the large time behavior to a 2D micro-macro
model for compressible polymeric fluids with small initial data. This model is
a coupling of isentropic compressible Navier-Stokes equations with a nonlinear
Fokker-Planck equation. Firstly the Fourier splitting method yields that the
logarithmic decay rate. By virtue of the time weighted energy estimate, we can
improve the decay rate to . Under the low-frequency
condition and by the Littlewood-Paley theory, we show that the solutions belong
to some Besov spaces with negative index and obtain the optimal decay
rate. Finally, we obtain the decay rate by establishing a new
Fourier splitting estimate
Global strong solutions and large time behavior to a micro-macro model for compressible polymeric fluids near equilibrium
In this paper, we mainly study the global strong solutions and its long time
decay rates of all order spatial derivatives to a micro-macro model for
compressible polymeric fluids with small initial data. This model is a coupling
of isentropic compressible Navier-Stokes equations with a nonlinear
Fokker-Planck equation. We first prove that the micro-macro model admits a
unique global strong solution provided the initial data are close to
equilibrium state for . Moreover, for , we also show a new
critical Fourier estimation that allow us to give the long time decay rates of
norm for all order spatial derivatives
Global existence and optimal decay rate of weak solutions to the co-rotation Hooke dumbbell model
In this paper, we mainly study global existence and optimal decay rate
of weak solutions to the co-rotation Hooke dumbbell model. This micro-macro
model is a coupling of the Navier-Stokes equation with a nonlinear
Fokker-Planck equation. Based on the defect measure propagation method, we
prove that the co-rotation Hooke dumbbell model admits a global weak solution
provided the initial data under different integrability conditions. Moreover,
we obtain optimal long time decay rate in for the weak solutions obtained
by the Fourier splitting method
Global existence and optimal decay rate of weak solutions to some inviscid Oldroyd-B models
This paper is devoted to global existence and optimal decay rate of weak
solutions to some inviscid Oldroyd-B models with center diffusion. By virtue of
the properties of Calderon-Zygmund operator and the Littlewood-Paley
decomposition theory, we firstly prove that the 2-D co-rotation inviscid
Oldroyd-B model admits global weak solutions with some large data under
different integrability conditions. Furthermore, we prove the energy
conservation of weak solutions for the co-rotation case. These obtained results
generalize and cover the classical results for the Euler equation. Moreover, we
establish global weak solutions with small data for the 2-D noncorotation
inviscid Oldroyd-B model without damping. Finally, we prove optimal decay rate
of global weak solutions for the noncorotation case by the improved Fourier
splitting method.Comment: 44 page
Heat shock protein 90: translation from cancer to Alzheimer's disease treatment?
Both malignant transformation and neurodegeneration, as it occurs in Alzheimer's disease, are complex and lengthy multistep processes characterized by abnormal expression, post-translational modification, and processing of certain proteins. To maintain and allow the accumulation of these dysregulated processes, and to facilitate the step-wise evolution of the disease phenotype, cells must co-opt a compensatory regulatory mechanism. In cancer, this role has been attributed to heat shock protein 90 (Hsp90), a molecular chaperone that maintains the functional conformation of multiple proteins involved in cell-specific oncogenic processes. In this sense, at the phenotypic level, Hsp90 appears to serve as a biochemical buffer for the numerous cancer-specific lesions that are characteristic of diverse tumors. The current review proposes a similar role for Hsp90 in neurodegeneration. It will present experimentally demonstrated, but also hypothetical, roles that suggest Hsp90 can act as a regulator of pathogenic changes that lead to the neurodegenerative phenotype in Alzheimer's disease
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