576 research outputs found
Advancing Adversarial Training by Injecting Booster Signal
Recent works have demonstrated that deep neural networks (DNNs) are highly
vulnerable to adversarial attacks. To defend against adversarial attacks, many
defense strategies have been proposed, among which adversarial training has
been demonstrated to be the most effective strategy. However, it has been known
that adversarial training sometimes hurts natural accuracy. Then, many works
focus on optimizing model parameters to handle the problem. Different from the
previous approaches, in this paper, we propose a new approach to improve the
adversarial robustness by using an external signal rather than model
parameters. In the proposed method, a well-optimized universal external signal
called a booster signal is injected into the outside of the image which does
not overlap with the original content. Then, it boosts both adversarial
robustness and natural accuracy. The booster signal is optimized in parallel to
model parameters step by step collaboratively. Experimental results show that
the booster signal can improve both the natural and robust accuracies over the
recent state-of-the-art adversarial training methods. Also, optimizing the
booster signal is general and flexible enough to be adopted on any existing
adversarial training methods.Comment: Accepted at IEEE Transactions on Neural Networks and Learning System
Surface Roughness Gradients Reveal Topography‐Specific Mechanosensitive Responses in Human Mesenchymal Stem Cells
The topographic features of an implant, which mechanically regulate cell behaviors and functions, are critical for the clinical success in tissue regeneration. How cells sense and respond to the topographical cues, e.g., interfacial roughness, is yet to be fully understood and even debatable. Here, the mechanotransduction and fate determination of human mesenchymal stem cells (MSCs) on surface roughness gradients are systematically studied. The broad range of topographical scales and high‐throughput imaging is achieved based on a catecholic polyglycerol coating fabricated by a one‐step‐tilted dip‐coating approach. It is revealed that the adhesion of MSCs is biphasically regulated by interfacial roughness. The cell mechanotransduction is investigated from focal adhesion to transcriptional activity, which explains that cellular response to interfacial roughness undergoes a direct force‐dependent mechanism. Moreover, the optimized roughness for promoting cell fate specification is explored
hidden charm decays of in a molecule scenario
Inspired by the recent observation of a new structure, , in the
process , we evaluate the possibility of
assigning as a molecular state with
by investigating the hidden charm decays of .
The partial widths of , and
channels are evaluated to be about ,
and , respectively. Considering
the experimental observation and the present estimations, we proposed to search
in the process in Belle II.Comment: 7 pages, 5 figures, accepted for publication in Phys. Rev.
Coupled-channel interactions and the origin of
Motivated by the recent observation of and
in the invariant mass distributions, we
investigate interactions in a coupled-channel approach. We
show that the relativistic corrections could be significant for the energy far
away from the threshold. Within the hidden local symmetry formalism, a sizable
attraction interaction is found in the isospin triplet sector that can
form a bound or a virtual state, which is consistent with the experimentally
observed . By reproducing a -
bound/virtual state with the pole mass equal to that of the
measured by LHCb in the sector , we
determine the unknown parameter in the loop function, and then search for
possible poles in the sectors of , 2 and , , 1, 2. The
predicted resonances provide a useful reference for the future experimental
studies of the systems and can be also helpful to unravel the
nature of the .10Comment: 10 pages, 6 figures, 3 table
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