1,611 research outputs found
Towards Robust Few-shot Point Cloud Semantic Segmentation
Few-shot point cloud semantic segmentation aims to train a model to quickly
adapt to new unseen classes with only a handful of support set samples.
However, the noise-free assumption in the support set can be easily violated in
many practical real-world settings. In this paper, we focus on improving the
robustness of few-shot point cloud segmentation under the detrimental influence
of noisy support sets during testing time. To this end, we first propose a
Component-level Clean Noise Separation (CCNS) representation learning to learn
discriminative feature representations that separates the clean samples of the
target classes from the noisy samples. Leveraging the well separated clean and
noisy support samples from our CCNS, we further propose a Multi-scale
Degree-based Noise Suppression (MDNS) scheme to remove the noisy shots from the
support set. We conduct extensive experiments on various noise settings on two
benchmark datasets. Our results show that the combination of CCNS and MDNS
significantly improves the performance. Our code is available at
https://github.com/Pixie8888/R3DFSSeg.Comment: BMVC 202
Synthetic-to-Real Domain Generalized Semantic Segmentation for 3D Indoor Point Clouds
Semantic segmentation in 3D indoor scenes has achieved remarkable performance
under the supervision of large-scale annotated data. However, previous works
rely on the assumption that the training and testing data are of the same
distribution, which may suffer from performance degradation when evaluated on
the out-of-distribution scenes. To alleviate the annotation cost and the
performance degradation, this paper introduces the synthetic-to-real domain
generalization setting to this task. Specifically, the domain gap between
synthetic and real-world point cloud data mainly lies in the different layouts
and point patterns. To address these problems, we first propose a clustering
instance mix (CINMix) augmentation technique to diversify the layouts of the
source data. In addition, we augment the point patterns of the source data and
introduce non-parametric multi-prototypes to ameliorate the intra-class
variance enlarged by the augmented point patterns. The multi-prototypes can
model the intra-class variance and rectify the global classifier in both
training and inference stages. Experiments on the synthetic-to-real benchmark
demonstrate that both CINMix and multi-prototypes can narrow the distribution
gap and thus improve the generalization ability on real-world datasets
Domain Adaptive Transfer Attack (DATA)-based Segmentation Networks for Building Extraction from Aerial Images
Semantic segmentation models based on convolutional neural networks (CNNs)
have gained much attention in relation to remote sensing and have achieved
remarkable performance for the extraction of buildings from high-resolution
aerial images. However, the issue of limited generalization for unseen images
remains. When there is a domain gap between the training and test datasets,
CNN-based segmentation models trained by a training dataset fail to segment
buildings for the test dataset. In this paper, we propose segmentation networks
based on a domain adaptive transfer attack (DATA) scheme for building
extraction from aerial images. The proposed system combines the domain transfer
and adversarial attack concepts. Based on the DATA scheme, the distribution of
the input images can be shifted to that of the target images while turning
images into adversarial examples against a target network. Defending
adversarial examples adapted to the target domain can overcome the performance
degradation due to the domain gap and increase the robustness of the
segmentation model. Cross-dataset experiments and the ablation study are
conducted for the three different datasets: the Inria aerial image labeling
dataset, the Massachusetts building dataset, and the WHU East Asia dataset.
Compared to the performance of the segmentation network without the DATA
scheme, the proposed method shows improvements in the overall IoU. Moreover, it
is verified that the proposed method outperforms even when compared to feature
adaptation (FA) and output space adaptation (OSA).Comment: 11pages, 12 figure
Generalized Few-Shot Point Cloud Segmentation Via Geometric Words
Existing fully-supervised point cloud segmentation methods suffer in the
dynamic testing environment with emerging new classes. Few-shot point cloud
segmentation algorithms address this problem by learning to adapt to new
classes at the sacrifice of segmentation accuracy for the base classes, which
severely impedes its practicality. This largely motivates us to present the
first attempt at a more practical paradigm of generalized few-shot point cloud
segmentation, which requires the model to generalize to new categories with
only a few support point clouds and simultaneously retain the capability to
segment base classes. We propose the geometric words to represent geometric
components shared between the base and novel classes, and incorporate them into
a novel geometric-aware semantic representation to facilitate better
generalization to the new classes without forgetting the old ones. Moreover, we
introduce geometric prototypes to guide the segmentation with geometric prior
knowledge. Extensive experiments on S3DIS and ScanNet consistently illustrate
the superior performance of our method over baseline methods. Our code is
available at: https://github.com/Pixie8888/GFS-3DSeg_GWs.Comment: Accepted by ICCV 202
17β-estradiol reduces inflammation and modulates antioxidant enzymes in colonic epithelial cells
Background/Aims: Estrogen is known to have protective effect in colorectal cancer development. The aims of this study are to investigate whether estradiol treatment reduces inflammation in CCD841CoN, a female human colonic epithelial cell line and to uncover underlying mechanisms of estradiol effects. Methods: 17 beta-Estradiol (E2) effect was measured by Western blot after inducing inflammation of CCD841CoN by tumor necrosis factor alpha (TNF-alpha). Expression levels of estrogen receptor alpha (ER alpha) and beta (ER beta), cyclooxygenase-2 (COX-2), nuclear factor-kappa B (NF-kappa B), heme oxygenase-1 (HO-1), and NAD(P)H-quinone oxidoreductase-1 (NQO-1) were also evaluated. Results: E2 treatment induced expression of ERO but did not increase that of ER alpha. E2 treatment for 48 hours significantly elevated the expression of anti-oxidant enzymes, HO-1 and NQO-1. TNF-alpha treatment significantly increased the level of activated NF-kappa B (p < 0.05), and this increase was significantly suppressed by treatment of to nM of E2 (p < 0.05). E2 treatment ameliorated TNF-alpha-induced COX-2 expression and decrease of HO-1 expression. 4-(2-phenyl-5,7-bis(trifluoromethyl) pyrazolo(1,5-a)pyrimidin-3-yl)phenol (PHTPP), antagonist of ER beta, removed the inhibitory effect of E2 in the TNF-alpha-induced COX-2 expression (p = 0.05). Conclusions: Estrogen seems to inhibit inflammation in female human colonic epithelial cell lines, through down-regulation of NF-kappa B and COX-2 expression and induction of anti-oxidant enzymes such as HO-1 and NQO-1.
The Effects of Heat and Massage Application on Autonomic Nervous System
∙ The authors have no financial conflicts of interest. © Copyright: Yonsei University College of Medicine 2011 This is an Open Access article distributed under the terms of the Creative Commons Attribution Non-Commercial Licens
Atomic Resolution Imaging of Rotated Bilayer Graphene Sheets Using a Low kV Aberration-corrected Transmission Electron Microscope
Modern aberration-corrected transmission electron microscope (TEM) with appropriate electron beam energy is able to achieve atomic resolution imaging of single and bilayer graphene sheets. Especially, atomic configuration of bilayer graphene with a rotation angle can be identified from the direct imaging and phase reconstructed imaging since atomic resolution Moir pattern can be obtained successfully at atomic scale using an aberration-corrected TEM. This study boosts a reliable stacking order analysis, which is required for synthesized or artificially prepared multilayer graphene, and lets graphene researchers utilize the information of atomic configuration of stacked graphene layers readily.ope
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