132 research outputs found
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Chapter 2Â -Â Data-Driven Energy Efficient Driving Control in Connected Vehicle Environment
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Reinforcement Learning for Hybrid and Plug-In Hybrid Electric Vehicle Energy Management: Recent Advances and Prospects
Assessment of Research Efficiency in China\u27s Universities Based on Data Envelopment Method
To investigate the static and dynamic trends of scientific research efficiency of different types of universities in China during the period of 2016 - 2020. Methods: Based on the scientific research data of six types of universities nationwide from 2016 to 2020, which are classified by the Compendium of Science and Technology Information of Higher Education Institutions published by the Department of Science and Technology of the Ministry of Education. We selected the full-time personnel (person-years) of research and development personnel and Internal expenditure for the year of science and technology funds (thousand yuan) as input evaluation indexes, and the number of Academic papers published abroad (articles), the number of international projects acceptance (item), the number of patent authorizations (item), and the number of Actual income of technology patents in the current year (thousands of yuan) as output evaluation indexes, and constructed the evaluation index system of scientific research efficiency of six types of universities nationwide. SPSS version 23.0 software was used for descriptive data statistics, and DEA-BCC model and DEA-Malmquist index model of DEAP2.1 software were used for static and dynamic evaluation of its scientific research efficiency from 2016 to 2020, respectively. Results â Overall analysis: the level of scientific research efficiency of all types of universities is high, but the total factor productivity of scientific research shows a trend of rising and then declining during the 13th Five-Year Plan period, and the overall scientific research efficiency of universities has limited room for improvement. ⥠Comparative analysis: universities of comprehensive, science and technology, medicine and other universities have the highest level of scientific research efficiency, followed by universities of teacher training and lower universities of agriculture and forestry. âą From 2017 - 2020, full-time personnel, internal expenditures of agriculture and forestry universities are input redundancy, patent authorization number and the actual income of agriculture and forestry universities are insufficient output. In 2020, full-time personnel, internal expenditures of normal universities are input redundancy, patent authorization number of normal universities is output insufficient. Conclusion: During the period of 2016 - 2020, all kinds of universities nationwide have achieved high research efficiency with high input and high output, which provides a strong reference for the national research management to allocate university research funds more scientifically and reasonably. This result to optimize the allocation of resources of university\u27s scientific research in China and improve the economic benefit of university\u27s scientific research has important theoretical and practical significance
An invariant set bifurcation theory for nonautonomous nonlinear evolution equations
In this paper we establish an invariant set bifurcation theory for the nonautonomous dynamical system generated by the evolution equation \begin{equation}\label{e0}u_t+Au=\lambda u+p(t,u),\hspace{0.4cm} p\in \mathcal H=\mathcal H[f(\cdot,u)]\end{equation} on a Hilbert space , where is a sectorial operator, is the bifurcation parameter, is translation compact, and is the hull of . Denote by the cocycle semiflow generated by the equation. Under some other assumptions on , we show that as the parameter crosses an eigenvalue of , the system bifurcates from to a nonautonomous invariant set on one-sided neighborhood of . Moreover,
where denotes the Hausdorff semidistance in (here () defined below is the fractional power spaces associated with ).
Our result is based on the pullback attractor bifurcation on the local central invariant manifolds
An invariant set bifurcation theory for nonautonomous nonlinear evolution equations
In this paper we establish an invariant set bifurcation theory for the nonautonomous dynamical system (Ïλ, Ξ)X,H generated by the evolution equation ut + Au = λu + p(t, u), p â H = H[ f(·, u)] (0.1) on a Hilbert space X, where A is a sectorial operator, λ is the bifurcation parameter, f(·, u) : R â X is translation compact, f(t, 0) ⥠0 and H[ f ] is the hull of f(·, u). Denote by Ïλ := Ïλ(t, p)u the cocycle semiflow generated by the system. Under some other assumptions on f , we show that as the parameter λ crosses an eigenvalue λ0 â R of A, the system bifurcates from 0 to a nonautonomous invariant set Bλ(·) on one-sided neighborhood of λ0. Moreover, lim λâλ0 HXα (Bλ(p), 0) = 0, p â P, where HXα (·, ·) denotes the Hausdorff semidistance in X (here X (α â„ 0) defined below is the fractional power spaces associated with A). Our result is based on the pullback attractor bifurcation on the local central invariant manifolds Mλ loc(·)
FedDef: Defense Against Gradient Leakage in Federated Learning-based Network Intrusion Detection Systems
Deep learning (DL) methods have been widely applied to anomaly-based network
intrusion detection system (NIDS) to detect malicious traffic. To expand the
usage scenarios of DL-based methods, the federated learning (FL) framework
allows multiple users to train a global model on the basis of respecting
individual data privacy. However, it has not yet been systematically evaluated
how robust FL-based NIDSs are against existing privacy attacks under existing
defenses. To address this issue, we propose two privacy evaluation metrics
designed for FL-based NIDSs, including (1) privacy score that evaluates the
similarity between the original and recovered traffic features using
reconstruction attacks, and (2) evasion rate against NIDSs using Generative
Adversarial Network-based adversarial attack with the reconstructed benign
traffic. We conduct experiments to show that existing defenses provide little
protection that the corresponding adversarial traffic can even evade the SOTA
NIDS Kitsune. To defend against such attacks and build a more robust FL-based
NIDS, we further propose FedDef, a novel optimization-based input perturbation
defense strategy with theoretical guarantee. It achieves both high utility by
minimizing the gradient distance and strong privacy protection by maximizing
the input distance. We experimentally evaluate four existing defenses on four
datasets and show that our defense outperforms all the baselines in terms of
privacy protection with up to 7 times higher privacy score, while maintaining
model accuracy loss within 3% under optimal parameter combination.Comment: 14 pages, 9 figures, submitted to TIF
SGAT4PASS: Spherical Geometry-Aware Transformer for PAnoramic Semantic Segmentation
As an important and challenging problem in computer vision, PAnoramic
Semantic Segmentation (PASS) gives complete scene perception based on an
ultra-wide angle of view. Usually, prevalent PASS methods with 2D panoramic
image input focus on solving image distortions but lack consideration of the 3D
properties of original data. Therefore, their performance will
drop a lot when inputting panoramic images with the 3D disturbance. To be more
robust to 3D disturbance, we propose our Spherical Geometry-Aware Transformer
for PAnoramic Semantic Segmentation (SGAT4PASS), considering 3D spherical
geometry knowledge. Specifically, a spherical geometry-aware framework is
proposed for PASS. It includes three modules, i.e., spherical geometry-aware
image projection, spherical deformable patch embedding, and a panorama-aware
loss, which takes input images with 3D disturbance into account, adds a
spherical geometry-aware constraint on the existing deformable patch embedding,
and indicates the pixel density of original data, respectively.
Experimental results on Stanford2D3D Panoramic datasets show that SGAT4PASS
significantly improves performance and robustness, with approximately a 2%
increase in mIoU, and when small 3D disturbances occur in the data, the
stability of our performance is improved by an order of magnitude. Our code and
supplementary material are available at
https://github.com/TencentARC/SGAT4PASS.Comment: Accepted by IJCAI 202
An IonophoreâBased AnionâSelective Optode Printed on Cellulose Paper
A general anionâsensing platform is reported based on a portable and costâeffective ionâselective optode and a smartphone detector equipped with a color analysis app. In contrast to traditional anionâselective optodes using a hydrophobic polymer and/or plasticizer to dissolve hydrophobic sensing elements, the new optode relies on hydrophilic cellulose paper. The anion ionophore and a lipophilic pH indicator are inkjetâprinted and adsorbed on paper and form a âdryâ hydrophobic sensing layer. Porous cellulose sheets also allow the sensing site to be modified with dried buffer that prevents any sample pH dependence of the observed color change. A highly selective fluoride optode using an AlIIIâporphyrin ionophore is examined as an initial example of this new anion sensing platform for measurements of fluoride levels in drinking water samples. Apart from Lewis acidâbase recognition, hydrogen bonding recognition is also compatible with this sensing platform.Cellulose paper as a sole substrate allows adsorption of a lipophilic anion ionophore and pHâsensitive indicator dye to enable heterogeneous anion sensing via an anionâproton coâextraction mechanism. This platform also enables adsorption of a buffer salt as the sample pH adjuster to prevent pH dependence of the optical anion response.Peer Reviewedhttps://deepblue.lib.umich.edu/bitstream/2027.42/138373/1/anie201706147-sup-0001-misc_information.pdfhttps://deepblue.lib.umich.edu/bitstream/2027.42/138373/2/anie201706147_am.pdfhttps://deepblue.lib.umich.edu/bitstream/2027.42/138373/3/anie201706147.pd
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