2,820 research outputs found
Adjacent Slice Feature Guided 2.5D Network for Pulmonary Nodule Segmentation
More and more attention has been paid to the segmentation of pulmonary
nodules. Among the current methods based on deep learning, 3D segmentation
methods directly input 3D images, which takes up a lot of memory and brings
huge computation. However, most of the 2D segmentation methods with less
parameters and calculation have the problem of lacking spatial relations
between slices, resulting in poor segmentation performance. In order to solve
these problems, we propose an adjacent slice feature guided 2.5D network. In
this paper, we design an adjacent slice feature fusion model to introduce
information from adjacent slices. To further improve the model performance, we
construct a multi-scale fusion module to capture more context information, in
addition, we design an edge-constrained loss function to optimize the
segmentation results in the edge region. Fully experiments show that our method
performs better than other existing methods in pulmonary nodule segmentation
task
Analysis of Speech Separation Performance Degradation on Emotional Speech Mixtures
Despite recent strides made in Speech Separation, most models are trained on
datasets with neutral emotions. Emotional speech has been known to degrade
performance of models in a variety of speech tasks, which reduces the
effectiveness of these models when deployed in real-world scenarios. In this
paper we perform analysis to differentiate the performance degradation arising
from the emotions in speech from the impact of out-of-domain inference. This is
measured using a carefully designed test dataset, Emo2Mix, consisting of
balanced data across all emotional combinations. We show that even models with
strong out-of-domain performance such as Sepformer can still suffer significant
degradation of up to 5.1 dB SI-SDRi on mixtures with strong emotions. This
demonstrates the importance of accounting for emotions in real-world speech
separation applications.Comment: Accepted by APSIPA ASC 202
Chinese Named Entity Recognition Method for Domain-Specific Text
The Chinese named entity recognition (NER) is a critical task in natural language processing, aiming at identifying and classifying named entities in text. However, the specificity of domain texts and the lack of large-scale labelled datasets have led to the poor performance of NER methods trained on public domain corpora on domain texts. In this paper, a named entity recognition method incorporating sentence semantic information is proposed, mainly by adaptively incorporating sentence semantic information into character semantic information through an attention mechanism and a gating mechanism to enhance entity feature representation while attenuating the noise generated by irrelevant character information. In addition, to address the lack of large-scale labelled samples, we used data self-augmentation methods to expand the training samples. Furthermore, we introduced a Weighted Strategy considering that the low-quality samples generated by the data self-augmentation process can have a negative impact on the model. Experiments on the TCM prescriptions corpus showed that the F1 values of our method outperformed the comparison methods
Gain-gain and gain-lossless PT-symmetry broken from PT-phase diagram
Parity-time (PT) symmetry and broken in micro/nano photonic structures have
been investigated extensively as they bring new opportunities to control the
flow of light based on non-Hermitian optics. Previous studies have focused on
the situations of PT-symmetry broken in loss-loss or gain-loss coupling
systems. Here, we theoretically predict the gain-gain and gain-lossless
PT-broken from phase diagram, where the boundaries between PT-symmetry and
PT-broken can be clearly defined in the full-parameter space including gain,
lossless and loss. For specific micro/nano photonic structures, such as coupled
waveguides, we give the transmission matrices of each phase space, which can be
used for beam splitting. Taking coupled waveguides as an example, we obtain
periodic energy exchange in PT-symmetry phase and exponential gain or loss in
PT-broken phase, which are consistent with the phase diagram. The scenario
giving a full view of PT-symmetry or broken, will not only deepen the
understanding of fundamental physics, but also will promote the breakthrough of
photonic applications like optical routers and beam splitters
Visualizing the elongated vortices in -Ga nanostrips
We study the magnetic response of superconducting -Ga via low
temperature scanning tunneling microscopy and spectroscopy. The magnetic vortex
cores rely substantially on the Ga geometry, and exhibit an unexpectedly-large
axial elongation with aspect ratio up to 40 in rectangular Ga nano-strips
(width 100 nm). This is in stark contrast with the isotropic circular
vortex core in a larger round-shaped Ga island. We suggest that the unusual
elongated vortices in Ga nanostrips originate from geometric confinement effect
probably via the strong repulsive interaction between the vortices and Meissner
screening currents at the sample edge. Our finding provides novel conceptual
insights into the geometrical confinement effect on magnetic vortices and forms
the basis for the technological applications of superconductors.Comment: published in Phys. Rev. B as a Rapid Communicatio
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