9,974 research outputs found
Face Recognition from Sequential Sparse 3D Data via Deep Registration
Previous works have shown that face recognition with high accurate 3D data is
more reliable and insensitive to pose and illumination variations. Recently,
low-cost and portable 3D acquisition techniques like ToF(Time of Flight) and
DoE based structured light systems enable us to access 3D data easily, e.g.,
via a mobile phone. However, such devices only provide sparse(limited speckles
in structured light system) and noisy 3D data which can not support face
recognition directly. In this paper, we aim at achieving high-performance face
recognition for devices equipped with such modules which is very meaningful in
practice as such devices will be very popular. We propose a framework to
perform face recognition by fusing a sequence of low-quality 3D data. As 3D
data are sparse and noisy which can not be well handled by conventional methods
like the ICP algorithm, we design a PointNet-like Deep Registration
Network(DRNet) which works with ordered 3D point coordinates while preserving
the ability of mining local structures via convolution. Meanwhile we develop a
novel loss function to optimize our DRNet based on the quaternion expression
which obviously outperforms other widely used functions. For face recognition,
we design a deep convolutional network which takes the fused 3D depth-map as
input based on AMSoftmax model. Experiments show that our DRNet can achieve
rotation error 0.95{\deg} and translation error 0.28mm for registration. The
face recognition on fused data also achieves rank-1 accuracy 99.2% , FAR-0.001
97.5% on Bosphorus dataset which is comparable with state-of-the-art
high-quality data based recognition performance.Comment: To be appeared in ICB201
Domain wall brane in a reduced Born-Infeld- theory
The Born-Infeld theory is reduced from the Born-Infeld determinantal
gravity in Weitzenb\"ock spacetime. We investigate a braneworld scenario in
this theory and obtain an analytic domain wall solution by utilizing the
first-order formalism. The model is stable against the linear tensor
perturbation. It is shown that the massless graviton is localized on the brane,
but the continuous massive gravitons are non-localized and will generate a tiny
correction with the behavior of to the Newtonian potential.
The four-dimensional teleparallel gravity is recovered as an effective infrared
theory on the brane. As a physical application, we consider the
(quasi-)localization property of spin-1/2 Dirac fermion in this model.Comment: 9 pages, 2 figures, published versio
Towards Bidirectional Hierarchical Representations for Attention-Based Neural Machine Translation
This paper proposes a hierarchical attentional neural translation model which
focuses on enhancing source-side hierarchical representations by covering both
local and global semantic information using a bidirectional tree-based encoder.
To maximize the predictive likelihood of target words, a weighted variant of an
attention mechanism is used to balance the attentive information between
lexical and phrase vectors. Using a tree-based rare word encoding, the proposed
model is extended to sub-word level to alleviate the out-of-vocabulary (OOV)
problem. Empirical results reveal that the proposed model significantly
outperforms sequence-to-sequence attention-based and tree-based neural
translation models in English-Chinese translation tasks.Comment: Accepted for publication at EMNLP 201
MSSM Anatomy of the Polarization Puzzle in B --> phi K* Decays
We analyze the polarization puzzle in the Minimal
Supersymmetric Standard Model (MSSM) including the neutral Higgs boson (NHB)
contributions. To calculate the non-factorizable contributions to hadronic
matrix elements of operators, we have used the QCD factorization framework to
the order. It is shown that the recent experimental results of the
polarization fractions in decays, which are difficult to be
explained in SM, could be explained in MSSM if there are flavor non-diagonal
squark mass matrix elements of 2nd and 3rd generations, which also satisfy all
relevant constraints from known experiments (, etc.). We have shown
in details that the experimental results can be accommodated with the flavor
non-diagonal mass insertion of chirality RL, RL+LR, RR, or LL+ RR when the NHB
contributions as well as corrections of hadronic matrix
elements of operators are included. However the branching ratios for the decay
are smaller than the experimental measurements.Comment: 15 pages, 5 figures, minor revision and references adde
El efecto de los letreros de información y la posición del diseño de la publicidad impresa en el comportamiento de compra: efecto moderador del conocimiento de la marca y el rango de precios
The purpose of this research is to discover the consumers’ buying behavior influence of information symbols in print advertisements, and also added the brand awareness and price range of the products as the interference, and to find out whether to increase or decrease the information symbols and page layout on purchasing behavior influence. A 3C electrical appliance retail channel in Taiwan has been applied as the research object, concentrating on the advertisement DM during the four promotions in 2013 and the sales volume. There were 1,196 product information and 136 3C electrical appliance brands. According to the variance analysis, the results indicated: First, some information symbols included the positive and negative effects on purchasing behavior; Second, overall, the interference effects only influenced low to medium brand awareness and low price range. In sum, the research generated both theoretical and practical implications and also provided future research advice.El propósito de esta investigación fue descubrir la influencia del comportamiento de compra de los consumidores de los sÃmbolos de información en los anuncios impresos, y también agregó el conocimiento de la marca y el rango de precios de los productos como la interferencia, para averiguar si aumentar o disminuir la información, asà como ver la influencia de los sÃmbolos y el diseño de la página sobre el comportamiento de compra. Se ha aplicado un canal minorista de electrodomésticos 3C en Taiwán como objeto de investigación, concentrándose en el DM publicitario durante las cuatro promociones en 2013 y el volumen de ventas. Según el análisis de varianza, los resultados indicaron: Primero, algunos sÃmbolos de información incluÃan los efectos positivos y negativos sobre el comportamiento de compra; En segundo lugar, en general, los efectos de interferencia solo influyeron en el conocimiento de la marca de bajo a medio y en el rango de precios bajo. En resumen, la investigación generó implicaciones tanto teóricas como prácticas y también brindó asesoramiento para futuras investigaciones
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