175 research outputs found
Local well-posedness and small Deborah limit of a molecule-based -tensor system
In this paper, we consider a hydrodynamic -tensor system for nematic
liquid crystal flow, which is derived from Doi-Onsager molecular theory by the
Bingham closure. We first prove the existence and uniqueness of local strong
solution. Furthermore, by taking Deborah number goes to zero and using the
Hilbert expansion method, we present a rigorous derivation from the
molecule-based -tensor theory to the Ericksen-Leslie theory.Comment: 44 page
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SAR object classification using the DAE with a modified triplet restriction
Aberrant resting-state brain activity in Huntington's disease: A voxel-based meta-analysis
IntroductionFunctional neuroimaging could provide abundant information of underling pathophysiological mechanisms of the clinical triad including motor, cognitive and psychiatric impairment in Huntington's Disease (HD).MethodsWe performed a voxel-based meta-analysis using anisotropic effect size-signed differential mapping (AES-SDM) method.Results6 studies (78 symptomatic HD, 102 premanifest HD and 131 healthy controls) were included in total. Altered resting-state brain activity was primarily detected in the bilateral medial part of superior frontal gyrus, bilateral anterior cingulate/paracingulate gyrus, left insula, left striatum, right cortico-spinal projections area, right inferior temporal gyrus area, right thalamus, right cerebellum and right gyrus rectus area. Premanifest and symptomatic HD patients showed different alterative pattern in the subgroup analyses.DiscussionThe robust and consistent abnormalities in the specific brain regions identified in the current study could help to understand the pathophysiology of HD and explore reliable neuroimaging biomarkers for monitoring disease progression, or even predicting the onset of premanifest HD patients
Dual Path Modeling for Semantic Matching by Perceiving Subtle Conflicts
Transformer-based pre-trained models have achieved great improvements in
semantic matching. However, existing models still suffer from insufficient
ability to capture subtle differences. The modification, addition and deletion
of words in sentence pairs may make it difficult for the model to predict their
relationship. To alleviate this problem, we propose a novel Dual Path Modeling
Framework to enhance the model's ability to perceive subtle differences in
sentence pairs by separately modeling affinity and difference semantics. Based
on dual-path modeling framework we design the Dual Path Modeling Network
(DPM-Net) to recognize semantic relations. And we conduct extensive experiments
on 10 well-studied semantic matching and robustness test datasets, and the
experimental results show that our proposed method achieves consistent
improvements over baselines.Comment: ICASSP 2023. arXiv admin note: text overlap with arXiv:2210.0345
Multiscale Superpixel Structured Difference Graph Convolutional Network for VL Representation
Within the multimodal field, the key to integrating vision and language lies
in establishing a good alignment strategy. Recently, benefiting from the
success of self-supervised learning, significant progress has been made in
multimodal semantic representation based on pre-trained models for vision and
language. However, there is still room for improvement in visual semantic
representation. The lack of spatial semantic coherence and vulnerability to
noise makes it challenging for current pixel or patch-based methods to
accurately extract complex scene boundaries. To this end, this paper develops
superpixel as a comprehensive compact representation of learnable image data,
which effectively reduces the number of visual primitives for subsequent
processing by clustering perceptually similar pixels. To mine more precise
topological relations, we propose a Multiscale Difference Graph Convolutional
Network (MDGCN). It parses the entire image as a fine-to-coarse hierarchical
structure of constituent visual patterns, and captures multiscale features by
progressively merging adjacent superpixels as graph nodes. Moreover, we predict
the differences between adjacent nodes through the graph structure,
facilitating key information aggregation of graph nodes to reason actual
semantic relations. Afterward, we design a multi-level fusion rule in a
bottom-up manner to avoid understanding deviation by learning complementary
spatial information at different regional scales. Our proposed method can be
well applied to multiple downstream task learning. Extensive experiments
demonstrate that our method is competitive with other state-of-the-art methods
in visual reasoning. Our code will be released upon publication
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