427 research outputs found
Explore the Power of Dropout on Few-shot Learning
The generalization power of the pre-trained model is the key for few-shot
deep learning. Dropout is a regularization technique used in traditional deep
learning methods. In this paper, we explore the power of dropout on few-shot
learning and provide some insights about how to use it. Extensive experiments
on the few-shot object detection and few-shot image classification datasets,
i.e., Pascal VOC, MS COCO, CUB, and mini-ImageNet, validate the effectiveness
of our method.Comment: arXiv admin note: substantial text overlap with arXiv:2210.0640
Correlation between the strength of low-temperature T-linear normal-state resistivity and in overdoped electron-doped cuprate superconductors
The recently observed an intimate link between the nature of the strange
metallic normal-state and superconductivity in the overdoped electron-doped
cuprate superconductors is calling for an explanation. Here the intrinsic
correlation between the strength of the low-temperature linear-in-temperature
normal-state resistivity and superconducting transition temperature
in the overdoped electron-doped cuprate superconductors is studied within the
framework of the kinetic-energy-driven superconductivity. On the one hand, the
main ingredient is identified into a electron pairing mechanism involving {\it
the spin excitation}, and then has a dome-like shape doping
dependence with the maximal that occurs at around the optimal
electron doping. On the other hand, in the normal-state above , the
low-temperature linear-in-temperature normal-state resistivity in the overdoped
regime arises from the momentum relaxation due to the electron umklapp
scattering mediated by {\it the same spin excitation}. This {\it same spin
excitation} that governs both the electron umklapp scattering responsible for
the low-temperature linear-in-temperature normal-state resistivity and electron
pairing responsible for superconductivity naturally generates a correlation
between the strength of the low-temperature linear-in-temperature normal-state
resistivity and in the overdoped regime.Comment: 12 pages, 6 figures. arXiv admin note: text overlap with
arXiv:2211.0308
T-linear resistivity in the strange-metal phase of cuprate superconductors due to umklapp scattering from a spin excitation
The strange-metal phase of cuprate superconductors exhibits a linear in
temperature resistivity, however, the origin of this remarkable anomaly is
still not well understood. Here the linear temperature dependence of the
electrical resistivity in the strange-metal phase of cuprate superconductors is
investigated from the underdoped to overdoped regimes. The momentum dependence
of the transport scattering rate arising from the umklapp scattering between
electrons by the exchange of the spin excitation is derived and employed to
calculate the electrical resistivity by making use of the Boltzmann equation.
It is shown that the antinodal umklapp scattering leads to the linear in
temperature resistivity in the low-temperature with the temperature linear
coefficient that decreases with the increase of the doping concentration,
however, the nodal umklapp scattering induces a deviation from the linear in
temperature resistivity in the far lower temperature, and then the quadratic in
temperature resistivity in the far lower temperature is generated by both the
antinodal and nodal umklapp scattering. The theory also shows that the same
spin excitation that acts like a bosonic glue to hold the electron pairs
together also mediates scattering of electrons in the strange-metal phase of
cuprtae superconductors responsible for the linear in temperature resistivity
and the associated electronic structure.Comment: 16 pages, 11 figure
Visual Exploration of 3D Shape Databases via Feature Selection
We present a visual analytics approach for constructing effective visual representations of 3D shape databases as projections of multidimensional feature vectors extracted from their shapes. We present several methods to construct effective projections in which different-class shapes are well separated from each other. First, we propose a greedy heuristic for searching for near-optimal projections in the space of feature combinations. Next, we show how human insight can improve the quality of the constructed projections by iteratively identifying and selecting a small subset features that are responsible for characterizing different classes. Our methods allow users to construct high-quality projections with low effort, to explain these projections in terms of the contribution of different features, and to identify both useful features and features that work adversely for the separation task. We demonstrate our approach on a real-world 3D shape database
The mechanism of the irradiation synergistic effect of Silicon bipolar junction transistors explained by multiscale simulations of Monte Carlo and excited-state first-principle calculations
Neutron and -ray irradiation damages to transistors are found to be
non-additive, and this is denoted as the irradiation synergistic effect (ISE).
Its mechanism is not well-understood. The recent defect-based model [ACS Appl.
Electron. Mater. 2, 3783 (2020)] for Silicon bipolar junction transistors (BJT)
achieve quantitative agreement with experiments, but its assumptions on the
defect reactions are unverified. Going beyond the model requires directly
representing the effect of -ray irradiation in first-principles
calculations, which is not feasible previously. In this work, we examine the
defect-based model of the ISE by developing a multiscale method for the
simulation of the -ray irradiation, where the -ray-induced
electronic excitations are treated explicitly in excited-state first-principles
calculations. We find the calculations agree with experiments, and the effect
of the -ray-induced excitation is significantly different from the
effects of defect charge state and temperature. We propose a diffusion-based
qualitative explanation of the mechanism of positive/negative ISE in NPN/PNP
BJTs in the end.Comment: 11 pages, 7 figures. Accepted by J. Chem. Phy
Rethinking Pseudo-LiDAR Representation
The recently proposed pseudo-LiDAR based 3D detectors greatly improve the
benchmark of monocular/stereo 3D detection task. However, the underlying
mechanism remains obscure to the research community. In this paper, we perform
an in-depth investigation and observe that the efficacy of pseudo-LiDAR
representation comes from the coordinate transformation, instead of data
representation itself. Based on this observation, we design an image based CNN
detector named Patch-Net, which is more generalized and can be instantiated as
pseudo-LiDAR based 3D detectors. Moreover, the pseudo-LiDAR data in our
PatchNet is organized as the image representation, which means existing 2D CNN
designs can be easily utilized for extracting deep features from input data and
boosting 3D detection performance. We conduct extensive experiments on the
challenging KITTI dataset, where the proposed PatchNet outperforms all existing
pseudo-LiDAR based counterparts. Code has been made available at:
https://github.com/xinzhuma/patchnet.Comment: ECCV2020. Supplemental Material attache
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