3,315 research outputs found
Snap and Find: Deep Discrete Cross-domain Garment Image Retrieval
With the increasing number of online stores, there is a pressing need for
intelligent search systems to understand the item photos snapped by customers
and search against large-scale product databases to find their desired items.
However, it is challenging for conventional retrieval systems to match up the
item photos captured by customers and the ones officially released by stores,
especially for garment images. To bridge the customer- and store- provided
garment photos, existing studies have been widely exploiting the clothing
attributes (\textit{e.g.,} black) and landmarks (\textit{e.g.,} collar) to
learn a common embedding space for garment representations. Unfortunately they
omit the sequential correlation of attributes and consume large quantity of
human labors to label the landmarks. In this paper, we propose a deep
multi-task cross-domain hashing termed \textit{DMCH}, in which cross-domain
embedding and sequential attribute learning are modeled simultaneously.
Sequential attribute learning not only provides the semantic guidance for
embedding, but also generates rich attention on discriminative local details
(\textit{e.g.,} black buttons) of clothing items without requiring extra
landmark labels. This leads to promising performance and 306 boost on
efficiency when compared with the state-of-the-art models, which is
demonstrated through rigorous experiments on two public fashion datasets
Bosonic SET to SPT Transition under Dyonic LSM Theorem
Employing large-scale quantum Monte Carlo simulatoins, we study the phase
diagram of a quantum spin model which is subject to the recently developed
dyonic Lieb-Shultz-Mattis (LSM) theorem. The theorem predicts there are
symmetry enriched/protected topological (SET/SPT) phases in the phase diagram.
Our numerical results reveal a first order quantum phase transition between SET
and SPT phases, consistent with an anyon condensation mechanism that enforces
SPT phase according to the theorem. Also there exists in the phase diagram a
symmetry-breaking phase in the form of superfluid (SF). The transition between
SET and SF is continuous and that between SPT and SF is first order.
Interestingly, the SET, SPT and SF phases meet at a critical endpoint, whose
presence can be universally explained via theory contains emergent gauge field
coupled to vortex fields, and consequently reveals the exotic feature of our
model even beyond the realm of dyonic LSM.Comment: 14 pages, 7 figure
Mott insulating states and quantum phase transitions of correlated SU(2N) Dirac fermions
The interplay between charge and spin degrees of freedom in strongly
correlated fermionic systems, in particular of Dirac fermions, is a
long-standing problem in condensed matter physics. We investigate the competing
orders in the half-filled SU(2N) Hubbard model on a honeycomb lattice, which
can be accurately realized in optical lattices with large-spin ultra-cold
alkaline-earth fermions. Employing large-scale projector determinant quantum
Monte Carlo simulations, we have explored quantum phase transitions from the
gapless Dirac semi-metals to the gapped Mott-insulating phases in the SU(4) and
SU(6) cases. Both of these Mott-insulating states are found to be columnar
valence bond solid (cVBS) and to be absent of the antiferromagnetic Neel
ordering and the loop current ordering. Inside the cVBS phases, the dimer
ordering is enhanced by increasing fermion components and behaves
non-monotonically as the interaction strength increases. Although the
transitions generally should be of first order due to a cubic invariance
possessed by the cVBS order, the coupling to gapless Dirac fermions can soften
the transitions to second order through a non-analytic term in the free energy.
Our simulations provide important guidance for the experimental exploration of
novel states of matter with ultra-cold alkaline earth fermions.Comment: 20 pages, 26 figure
Try This Instead: Personalized and Interpretable Substitute Recommendation
As a fundamental yet significant process in personalized recommendation,
candidate generation and suggestion effectively help users spot the most
suitable items for them. Consequently, identifying substitutable items that are
interchangeable opens up new opportunities to refine the quality of generated
candidates. When a user is browsing a specific type of product (e.g., a laptop)
to buy, the accurate recommendation of substitutes (e.g., better equipped
laptops) can offer the user more suitable options to choose from, thus
substantially increasing the chance of a successful purchase. However, existing
methods merely treat this problem as mining pairwise item relationships without
the consideration of users' personal preferences. Moreover, the substitutable
relationships are implicitly identified through the learned latent
representations of items, leading to uninterpretable recommendation results. In
this paper, we propose attribute-aware collaborative filtering (A2CF) to
perform substitute recommendation by addressing issues from both
personalization and interpretability perspectives. Instead of directly
modelling user-item interactions, we extract explicit and polarized item
attributes from user reviews with sentiment analysis, whereafter the
representations of attributes, users, and items are simultaneously learned.
Then, by treating attributes as the bridge between users and items, we can
thoroughly model the user-item preferences (i.e., personalization) and
item-item relationships (i.e., substitution) for recommendation. In addition,
A2CF is capable of generating intuitive interpretations by analyzing which
attributes a user currently cares the most and comparing the recommended
substitutes with her/his currently browsed items at an attribute level. The
recommendation effectiveness and interpretation quality of A2CF are
demonstrated via extensive experiments on three real datasets.Comment: To appear in SIGIR'2
Reduced Low Dose Rate Sensitivity and its Mechanism in Bipolar Junction Transistors
It is surprising that only an enhanced low-dose-rate sensitivity (ELDRS), but
not its contrariety, a reduced low-dose-rate sensitivity (RLDRS), is
experimentally observed in bipolar junction transistors. In this work, we
attribute this strong asymmetry to an overwhelming superiority of hydrogen
cracking reactions relative to Shockley-Read-Hall recombinations. We
demonstrate that this situation can be completely reversed and an RLDRS effect
can occur by decreasing the concentration ratio between hydrogen and
recombination centers. We show that the decrease of recombination rate of holes
(generation rate of protons) with increasing dose rate is responsible for the
positive (negative) dose-rate dependence of RLDRS (ELDRS). We also find an
RLDRS-ELDRS transition for decreasing dose rate, in which the transition point
can be controlled by the concentration ratio. The proposed RLDRS effect and its
tunability pave a way for a credible acceleration test of the total ionizing
dose damage in different low dose rate environments.Comment: Reduced Low Dose Rate Sensitivity (RLDRS) as a contrariety to the
widely observed ELDRS is proposed for BJ
A global analysis for searching neutrinos associated with the black holes merging gravitational wave events
Several neutrino observatories have searched for coincident neutrino signals
associated with gravitational waves induced by the merging of two black
holes.No statistically significant neutrino signal in excess of background
level was observed.These experiments use different neutrino detection
technologies and are sensitive to various neutrino types.A combined analysis
was performed on the KamLAND, Super-Kamiokande and Borexino experimental data
with a frequentist statistical approach to achieve a global picture of the
associated neutrino fluence.Both monochromatic and Fermi-Dirac neutrino spectra
were assumed in the calculation.The final results are consistent with null
neutrino signals associated with a binary of black holes merging process.The
derived 90\% confidence level upper limits on the fluence and luminosity of
various neutrino types are presented for neutrino energy less than 110 MeV.Comment: 9 pages, 3 figure
A diagrammatic categorification of the fermion algebra
In this paper, we study the diagrammatic categorification of the fermion
algebra. We construct a graphical category corresponding to the one-dimensional
fermion algebra, and we investigate the properties of this category. The
categorical analogues of the Fock states are some kind of 1-morphisms in our
category, and the dimension of the vector space of 2-morphisms is exactly the
inner product of the corresponding Fock states. All the results in our
categorical framework coincide exactly with those in normal quantum mechanics.Comment: 10 pages, many TikZ figures. To appear in Chin. Phys.
Longitudinal Safety Analysis For Heterogeneous Platoon Of Automated And Human Vehicles
With the recent advancement in environmental sensing, vehicle control and
vehicle-infrastructure cooperation technologies, more and more autonomous
driving companies start to put their intelligent cars into road test. But in
the near future, we will face a heterogeneous traffic with both intelligent
connected vehicles and human vehicles. In this paper, we investigated the
impacts of four collision avoidance algorithms under different intelligent
connected vehicles market penetration rate. A customized simulation platform is
built, in which a platoon can be initiated with many key parameters. For every
short time interval, the dynamics of vehicles are updated and input in a
kinematics model. If a collision occurs, the energy loss is calculated to
represent the crash severity. Four collision avoidance algorithms are chosen
and compared in terms of the crash rate and severity at different market
penetration rate and different locations of the platoon. The results generate
interesting debates on the issues of heterogeneous platoon safety.Comment: 6 pages, 13 figures; The 21st IEEE International Conference on
Intelligent Transportation System
Fractionalized conductivity and emergent self-duality near topological phase transitions
The experimental discovery of the fractional Hall conductivity in
two-dimensional electron gases revealed new types of quantum particles, called
anyons, which are beyond bosons and fermions as they possess fractionalized
exchange statistics. These anyons are usually studied deep inside an insulating
topological phase. It is natural to ask whether such fractionalization can be
detected more broadly, say near a phase transition from a conventional to a
topological phase. To answer this question, we study a strongly correlated
quantum phase transition between a topological state, called a
quantum spin liquid, and a conventional superfluid using large-scale quantum
Monte Carlo simulations. Our results show that the universal conductivity at
the quantum critical point becomes a simple fraction of its value at the
conventional insulator-to-superfluid transition. Moreover, a dynamically
self-dual optical conductivity emerges at low temperatures above the transition
point, indicating the presence of the elusive vison particles. Our study opens
the door for the experimental detection of anyons in a broader regime, and has
ramifications in the study of quantum materials, programmable quantum
simulators, and ultra-cold atomic gases. In the latter case, we discuss the
feasibility of measurements in optical lattices using current techniques.Comment: 10+4 pages, 4+3 figures. v2: New results regarding emergent dynamical
self-duality due to visons. New figure of vison-pair spectra. Extended
discussion and appendice
Dynamical Signature of Symmetry Fractionalization in Frustrated Magnets
The nontrivialness of quantum spin liquid (QSL) typically manifests in the
non-local observables that signifies their existence, however, this fact
actually casts shadow on detecting QSL with experimentally accessible probes.
Here, we provide a solution by unbiasedly demonstrating dynamical signature of
anyonic excitations and symmetry fractionalization in QSL. Employing
large-scale quantum Monte Carlo simulation and stochastic analytic
continuation, we investigate the extended XXZ model on the kagome lattice, and
find out that across the phase transitions from Z2 QSLs to different symmetry
breaking phases, spin spectral functions can reveal the presence and
condensation of emergent anyonic spinon and vison excitations, in particular
the translational symmetry fractionalization of the latter, which can be served
as the unique dynamical signature of the seemingly ephemeral QSLs in
spectroscopic techniques such as inelastic neutron or resonance (inelastic)
X-ray scatterings.Comment: 8 pages,6 figure
- …