19 research outputs found
Efficient Deep Spiking Multi-Layer Perceptrons with Multiplication-Free Inference
Advancements in adapting deep convolution architectures for Spiking Neural
Networks (SNNs) have significantly enhanced image classification performance
and reduced computational burdens. However, the inability of
Multiplication-Free Inference (MFI) to harmonize with attention and transformer
mechanisms, which are critical to superior performance on high-resolution
vision tasks, imposes limitations on these gains. To address this, our research
explores a new pathway, drawing inspiration from the progress made in
Multi-Layer Perceptrons (MLPs). We propose an innovative spiking MLP
architecture that uses batch normalization to retain MFI compatibility and
introduces a spiking patch encoding layer to reinforce local feature extraction
capabilities. As a result, we establish an efficient multi-stage spiking MLP
network that effectively blends global receptive fields with local feature
extraction for comprehensive spike-based computation. Without relying on
pre-training or sophisticated SNN training techniques, our network secures a
top-1 accuracy of 66.39% on the ImageNet-1K dataset, surpassing the directly
trained spiking ResNet-34 by 2.67%. Furthermore, we curtail computational
costs, model capacity, and simulation steps. An expanded version of our network
challenges the performance of the spiking VGG-16 network with a 71.64% top-1
accuracy, all while operating with a model capacity 2.1 times smaller. Our
findings accentuate the potential of our deep SNN architecture in seamlessly
integrating global and local learning abilities. Interestingly, the trained
receptive field in our network mirrors the activity patterns of cortical cells.Comment: 11 pages, 6 figure
Search for light dark matter from atmosphere in PandaX-4T
We report a search for light dark matter produced through the cascading decay
of mesons, which are created as a result of inelastic collisions between
cosmic rays and Earth's atmosphere. We introduce a new and general framework,
publicly accessible, designed to address boosted dark matter specifically, with
which a full and dedicated simulation including both elastic and quasi-elastic
processes of Earth attenuation effect on the dark matter particles arriving at
the detector is performed. In the PandaX-4T commissioning data of 0.63
tonneyear exposure, no significant excess over background is observed.
The first constraints on the interaction between light dark matter generated in
the atmosphere and nucleus through a light scalar mediator are obtained. The
lowest excluded cross-section is set at for
dark matter mass of MeV and mediator mass of 300 MeV. The
lowest upper limit of to dark matter decay branching ratio is
A Search for Light Fermionic Dark Matter Absorption on Electrons in PandaX-4T
We report a search on a sub-MeV fermionic dark matter absorbed by electrons
with an outgoing active neutrino using the 0.63 tonne-year exposure collected
by PandaX-4T liquid xenon experiment. No significant signals are observed over
the expected background. The data are interpreted into limits to the effective
couplings between such dark matter and electrons. For axial-vector or vector
interactions, our sensitivity is competitive in comparison to existing
astrophysical bounds on the decay of such dark matter into photon final states.
In particular, we present the first direct detection limits for an axial-vector
(vector) interaction which are the strongest in the mass range from 25 to 45
(35 to 50) keV/c
Biodegradable Electrospun Nanofiber Membranes as Promising Candidates for the Development of Face Masks
Aerosol particles, such as the widespread COVID-19 recently, have posed a great threat to humans. Combat experience has proven that masks can protect against viruses; however, the epidemic in recent years has caused serious environmental pollution from plastic medical supplies, especially masks. Degradable filters are promising candidates to alleviate this problem. Degradable nanofiber filters, which are developed by the electrospinning technique, can achieve superior filtration performance. This review focuses on the basic introduction to air filtration, the general aspects of face masks, and nanofibers. Furthermore, the progress of the state of art degradable electrospun nanofiber filters have been summarized, such as silk fibroin (SF), polylactic acid (PLA), chitosan, cellulose, and zein. Finally, the challenges and future development are highlighted
Data_Sheet_1_Association of caffeine intake with all-cause and cardiovascular mortality in elderly patients with hypertension.XLSX
BackgroundCaffeine is widely consumed not only in coffee but also in soft drinks and tea. However, the long-term health effects of caffeine are still controversial, especially in people with high cardiovascular risk such as elderly patients with hypertension.MethodsThis study analyzed data from the National Health and Nutrition Examination Survey 2003–2018. Caffeine intake was calculated by two 24-h dietary recall interviews. Complex sampling-weighted multivariable Cox proportional hazards models were used to compare the hazard ratios (HRs) of all-cause and cardiovascular mortality in elderly hypertensive patients with different caffeine intake (ResultsThis study included 6,076 elderly hypertensive patients. The mean ± standard error follow-up duration was 6.86 ± 0.12 years. During this period, a total of 2,200 all-cause deaths occurred, of which 765 were cardiovascular deaths. Taking patients with caffeine intake ConclusionModerate caffeine intake is associated with reduced risk of all-cause and cardiovascular mortality in elderly hypertensive patients.</p