106 research outputs found
Structural Deep Embedding for Hyper-Networks
Network embedding has recently attracted lots of attentions in data mining.
Existing network embedding methods mainly focus on networks with pairwise
relationships. In real world, however, the relationships among data points
could go beyond pairwise, i.e., three or more objects are involved in each
relationship represented by a hyperedge, thus forming hyper-networks. These
hyper-networks pose great challenges to existing network embedding methods when
the hyperedges are indecomposable, that is to say, any subset of nodes in a
hyperedge cannot form another hyperedge. These indecomposable hyperedges are
especially common in heterogeneous networks. In this paper, we propose a novel
Deep Hyper-Network Embedding (DHNE) model to embed hyper-networks with
indecomposable hyperedges. More specifically, we theoretically prove that any
linear similarity metric in embedding space commonly used in existing methods
cannot maintain the indecomposibility property in hyper-networks, and thus
propose a new deep model to realize a non-linear tuplewise similarity function
while preserving both local and global proximities in the formed embedding
space. We conduct extensive experiments on four different types of
hyper-networks, including a GPS network, an online social network, a drug
network and a semantic network. The empirical results demonstrate that our
method can significantly and consistently outperform the state-of-the-art
algorithms.Comment: Accepted by AAAI 1
Investigations of supernovae and supernova remnants in the era of SKA
Two main physical mechanisms are used to explain supernova explosions:
thermonuclear explosion of a white dwarf(Type Ia) and core collapse of a
massive star (Type II and Type Ib/Ic). Type Ia supernovae serve as distance
indicators that led to the discovery of the accelerating expansion of the
Universe. The exact nature of their progenitor systems however remain unclear.
Radio emission from the interaction between the explosion shock front and its
surrounding CSM or ISM provides an important probe into the progenitor star's
last evolutionary stage. No radio emission has yet been detected from Type Ia
supernovae by current telescopes. The SKA will hopefully detect radio emission
from Type Ia supernovae due to its much better sensitivity and resolution.
There is a 'supernovae rate problem' for the core collapse supernovae because
the optically dim ones are missed due to being intrinsically faint and/or due
to dust obscuration. A number of dust-enshrouded optically hidden supernovae
should be discovered via SKA1-MID/survey, especially for those located in the
innermost regions of their host galaxies. Meanwhile, the detection of
intrinsically dim SNe will also benefit from SKA1. The detection rate will
provide unique information about the current star formation rate and the
initial mass function. A supernova explosion triggers a shock wave which expels
and heats the surrounding CSM and ISM, and forms a supernova remnant (SNR). It
is expected that more SNRs will be discovered by the SKA. This may decrease the
discrepancy between the expected and observed numbers of SNRs. Several SNRs
have been confirmed to accelerate protons, the main component of cosmic rays,
to very high energy by their shocks. This brings us hope of solving the
Galactic cosmic ray origin's puzzle by combining the low frequency (SKA) and
very high frequency (Cherenkov Telescope Array: CTA) bands' observations of
SNRs.Comment: To be published in: "Advancing Astrophysics with the Square Kilometre
Array", Proceedings of Science, PoS(AASKA14
qPrimerDepot: a primer database for quantitative real time PCR
Gene expression studies employing high throughput real time PCR methods require finding uniform conditions for optimal amplification of multiple targets, often a daunting task. We developed a primer database, qPrimerDepot, which provides optimized primers for all human and mouse RefSeq genes. These primers are designed to amplify desired templates under unified annealing temperature. For most intron-bearing genes, primers flank one of the largest introns thus minimizing background noise due to genomic DNA contamination. The qPrimerDepot database can be accessed at and
Magneto hydrodynamic simulations of the supernova remnant G1.9+0.3
The youngest Galactic supernova remnant G1.9+0.3 shows a discrete feature
between its radio and X-ray morphologies. The observed radio morphology
features a single maximum in the north, while the X-ray observation shows two
opposite 'ears' on the east and west sides. Using 3D magneto hydrodynamical
simulations, we investigate the formation of the discrete feature of the
remnant. We have tested different parameters for better simulation and
reproduced similar discrete features under an environment with density gradient
and an environment with clump, which provides a possible explanation of the
observation
Disparity-preserved Deep Cross-platform Association for Cross-platform Video Recommendation
Cross-platform recommendation aims to improve recommendation accuracy through
associating information from different platforms. Existing cross-platform
recommendation approaches assume all cross-platform information to be
consistent with each other and can be aligned. However, there remain two
unsolved challenges: i) there exist inconsistencies in cross-platform
association due to platform-specific disparity, and ii) data from distinct
platforms may have different semantic granularities. In this paper, we propose
a cross-platform association model for cross-platform video recommendation,
i.e., Disparity-preserved Deep Cross-platform Association (DCA), taking
platform-specific disparity and granularity difference into consideration. The
proposed DCA model employs a partially-connected multi-modal autoencoder, which
is capable of explicitly capturing platform-specific information, as well as
utilizing nonlinear mapping functions to handle granularity differences. We
then present a cross-platform video recommendation approach based on the
proposed DCA model. Extensive experiments for our cross-platform recommendation
framework on real-world dataset demonstrate that the proposed DCA model
significantly outperform existing cross-platform recommendation methods in
terms of various evaluation metrics
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