777 research outputs found
GFF: Gated Fully Fusion for Semantic Segmentation
Semantic segmentation generates comprehensive understanding of scenes through
densely predicting the category for each pixel. High-level features from Deep
Convolutional Neural Networks already demonstrate their effectiveness in
semantic segmentation tasks, however the coarse resolution of high-level
features often leads to inferior results for small/thin objects where detailed
information is important. It is natural to consider importing low level
features to compensate for the lost detailed information in high-level
features.Unfortunately, simply combining multi-level features suffers from the
semantic gap among them. In this paper, we propose a new architecture, named
Gated Fully Fusion (GFF), to selectively fuse features from multiple levels
using gates in a fully connected way. Specifically, features at each level are
enhanced by higher-level features with stronger semantics and lower-level
features with more details, and gates are used to control the propagation of
useful information which significantly reduces the noises during fusion. We
achieve the state of the art results on four challenging scene parsing datasets
including Cityscapes, Pascal Context, COCO-stuff and ADE20K.Comment: accepted by AAAI-2020(oral
Long-term in situ observations on typhoon-triggered turbidity currents in the deep sea
This work is supported by the National Science Foundation of China (grants 91528304, 41576005, and 41530964). We thank J. Li, X. Lyu, P. Li, K. Duan, J. Ronan, Y. Wang, P. Ma, and Y. Li for cruise assistance; G. de Lange and J. Hinojosa for editing an early version of manuscript; and E. Pope and two anonymous reviewers for their reviews.Peer reviewedPublisher PD
Rethinking Masked Language Modeling for Chinese Spelling Correction
In this paper, we study Chinese Spelling Correction (CSC) as a joint decision
made by two separate models: a language model and an error model. Through
empirical analysis, we find that fine-tuning BERT tends to over-fit the error
model while under-fit the language model, resulting in poor generalization to
out-of-distribution error patterns. Given that BERT is the backbone of most CSC
models, this phenomenon has a significant negative impact. To address this
issue, we are releasing a multi-domain benchmark LEMON, with higher quality and
diversity than existing benchmarks, to allow a comprehensive assessment of the
open domain generalization of CSC models. Then, we demonstrate that a very
simple strategy, randomly masking 20\% non-error tokens from the input sequence
during fine-tuning is sufficient for learning a much better language model
without sacrificing the error model. This technique can be applied to any model
architecture and achieves new state-of-the-art results on SIGHAN, ECSpell, and
LEMON.Comment: Accepted by ACL'202
Tuning the Dzyaloshinskii-Moriya Interaction in Pt/Co/MgO heterostructures through MgO thickness
The interfacial Dzyaloshinskii-Moriya interaction (DMI) in the
ferromagnetic/heavy metal ultra-thin film structures , has attracted a lot of
attention thanks to its capability to stabilize Neel-type domain walls (DWs)
and magnetic skyrmions for the realization of non-volatile memory and logic
devices. In this study, we demonstrate that magnetic properties in
perpendicularly magnetized Ta/Pt/Co/MgO/Pt heterostructures, such as
magnetization and DMI, can be significantly influenced through both the MgO and
the Co ultrathin film thickness. By using a field-driven creep regime domain
expansion technique, we find that non-monotonic tendencies of DMI field appear
when changing the thickness of MgO and the MgO thickness corresponding to the
largest DMI field varies as a function of the Co thicknesses. We interpret this
efficient control of DMI as subtle changes of both Pt/Co and Co/MgO interfaces,
which provide a method to investigate ultra-thin structures design to achieve
skyrmion electronics.Comment: 18 pages, 11 figure
Identification and characterization of bovine regulator of telomere length elongation helicase gene (RTEL): molecular cloning, expression distribution, splice variants and DNA methylation profile
BACKGROUND: The genetic basis of telomere length heterogeneity among mammalian species is still not well understood. Recently, a gene named regulator of telomere length elongation helicase (RTEL) was identified and predicted to be an essential participant in species-specific telomere length regulation in two murine species. To obtain broader insights into its structure and biological functions and to ascertain whether RTEL is also a candidate gene in the regulation of telomere length diversity in other mammalian species, data from other mammals may be helpful. RESULTS: Here we report the cDNA cloning, genomic structure, chromosomal location, alternative splicing pattern, expression distribution and DNA methylation profile of the bovine homolog of RTEL. The longest transcript of bovine RTEL is 4440 nt, encompassing 24.8 kb of genomic sequence that was mapped to chromosome 13q2.2. It encodes a conserved helicase-like protein containing seven characterized helicase motifs in the first 750 aa and a PIP box in the C-terminus. Four splice variants were identified within the transcripts in both the coding and 5'-untranslated regions; Western blot revealed that the most abundant splice variant SV-1 was translated to a truncated isoform of RTEL. The different 5'UTRs imply alternative transcription start sites in the promoter; Bovine RTEL was transcribed at the blastocyst stage, and expression levels were highest in adult testis, liver and ovary. DNA methylation analysis of tissues that differed significantly in expression level indicated that relatively low DNA methylation is associated with higher expression. CONCLUSION: In this study, we have identified and characterized a bovine RTEL homolog and obtained basic information about it, including gene structure, expression distribution, splice variants and profile of DNA methylation around two putative transcription start sites. These data may be helpful for further comparative and functional analysis of RTEL in mammals
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