3,105 research outputs found
A Novel Model of Working Set Selection for SMO Decomposition Methods
In the process of training Support Vector Machines (SVMs) by decomposition
methods, working set selection is an important technique, and some exciting
schemes were employed into this field. To improve working set selection, we
propose a new model for working set selection in sequential minimal
optimization (SMO) decomposition methods. In this model, it selects B as
working set without reselection. Some properties are given by simple proof, and
experiments demonstrate that the proposed method is in general faster than
existing methods.Comment: 8 pages, 12 figures, it was submitted to IEEE International
conference of Tools on Artificial Intelligenc
Physical properties of noncentrosymmetric superconductor RuB
Transition metal boride RuB was found to be a noncentrosymmetric
superconductor with equal to 3.3 K. Superconducting and normal state
properties of RuB were determined by a self-consistent analysis through
resistivity( and ), specific heat, lower critical field
measurement and electronic band structure calculation. It is found that
RuB belongs to an s-wave dominated single band superconductor with
energy gap 0.5 meV and could be categorized into type II superconductor with
weak electron-phonon coupling. Unusual 'kink' feature is clearly observed in
field-broadening resistivity curves, suggesting the possible mixture of spin
triplet induced by the lattice without inversion symmetry.Comment: 11 pages, 16 figures. submitted to Phys. Rev.
Evidence for Two Gaps and Breakdown of the Uemura Plot in BaKFeAs Single Crystals
We report a detailed investigation on the lower critical field of
the superconducting BaKFeAs (FeAs-122) single crystals.
A pronounced kink is observed on the curve, which is attributed to
the existence of two superconducting gaps. By fitting the data to
the two-gap BCS model in full temperature region, a small gap of
meV and a large gap of meV
are obtained. The in-plane penetration depth is estimated to
be 105 nm corresponding to a rather large superfluid density, which points to
the breakdown of the Uemura plot in FeAs-122 superconductors.Comment: 5 pages, 4 figure
Polychromatic drivers for inertial fusion energy
Although tremendous achievements have been made toward inertial confinement
fusion, laser plasma instabilities (LPIs) remain to be an inevitable problem
for current drive schemes. To mitigate these instabilities, significant efforts
have been paid to produce high-power broadband ultraviolet lasers. However, no
practical scheme has been demonstrated up to now for efficient triple-frequency
conversion of broadband laser. Here we propose the design of polychromatic
drivers for the generation of multicolor beams mainly based upon the optical
parametric amplification, which can significantly enhance the third-harmonic
conversion efficiency. Each polychromatic light has four colors of
monochromatic beamlets with a full spectrum width of 3\%, and the beamlet
colors of any two adjacent flanges are different. The suppression effects of
such polychromatic lights have been investigated via large scale
particle-in-cell simulations, which indicate that more than 35\% of the
incident energy can be saved from the LPIs compared with monochromatic lasers
for the direct-drive scheme, or high-density filled target for the
indirect-drive scheme. The proposed polychromatic drivers are based on the
matured technologies, and thus may pave the way towards realization of robust
and high-efficiency fusion ignition
Xanthogranulomatous Inflammation of the Female Genital Tract: Report of Three Cases
Purpose and Methods: This is a series of three cases diagnosed with xanthogranulomatous inflammation of the female genital with emphasis on the etiology, clinical-pathologic features and biological behavior. Clinical, pathologic, radiologic and follow up data are reported
Quaternion-Based Graph Convolution Network for Recommendation
Graph Convolution Network (GCN) has been widely applied in recommender
systems for its representation learning capability on user and item embeddings.
However, GCN is vulnerable to noisy and incomplete graphs, which are common in
real world, due to its recursive message propagation mechanism. In the
literature, some work propose to remove the feature transformation during
message propagation, but making it unable to effectively capture the graph
structural features. Moreover, they model users and items in the Euclidean
space, which has been demonstrated to have high distortion when modeling
complex graphs, further degrading the capability to capture the graph
structural features and leading to sub-optimal performance. To this end, in
this paper, we propose a simple yet effective Quaternion-based Graph
Convolution Network (QGCN) recommendation model. In the proposed model, we
utilize the hyper-complex Quaternion space to learn user and item
representations and feature transformation to improve both performance and
robustness. Specifically, we first embed all users and items into the
Quaternion space. Then, we introduce the quaternion embedding propagation
layers with quaternion feature transformation to perform message propagation.
Finally, we combine the embeddings generated at each layer with the mean
pooling strategy to obtain the final embeddings for recommendation. Extensive
experiments on three public benchmark datasets demonstrate that our proposed
QGCN model outperforms baseline methods by a large margin.Comment: 13 pages, 7 figures, 6 tables. Submitted to ICDE 202
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