1,004 research outputs found
USE OF THE STATE-TRAIT ANXIETY INVENTORY WITH CHILDREN AND ADOLESCENTS IN CHINA: ISSUES WITH REACTION TIMES
The State-Trait Anxiety Inventory (Form Y; STAI-Y) is a balanced scale with a complex factor structure. Using survey data from children and adolescents in Jiangxi Province, China (N = 1,275), we conducted confirmatory factor analysis to clarify the number of factors in this instrument and to investigate the relationship between reaction time (RT) and anxiety. Results revealed the following 3 dimensions for the STAI-Y: anxiety absent, anxiety present, and general anxiety. Compared with those who answered all the questions (58%), those who missed questions (42%) had a lower education level, a longer RT, and higher scores for items indicating the presence of state or trait anxiety. Our results could provide innovative directions for the improvement and expansion of research using the STAI-Y with children and adolescents
Hawking Radiation of Black p-Branes from Gravitational Anomaly
We investigate the Hawking radiation of black -branes of superstring
theories using the method of anomaly cancelation, specially, we use the method
of [S. Iso, H. Umetsu and F. Wilczek, {\sl Phys. Rev. Lett.} {\bf 96}, 151302
(2006); {\sl Phys. Rev. D} {\bf 74}, 044017 (2006)]. The metrics of black
-branes are spherically symmetric, but not the Schwarzschild type. In order
to simplify the calculation, we first make a coordinate transformation to
transform the metric to the Schwarzschild type. Then we calculate its
energy-momentum flux from the method of anomaly cancelation of the above
mentioned references. The obtained energy-momentum flux is equal to a black
body radiation, the thermodynamic temperature of the radiation is equal to its
Hawking temperature. And we find that the results are not changed for the
original non-Schwarzschild type spherically symmetric metric.Comment: 19 pages Latex, some mistakes correcte
Distributionally Adversarial Attack
Recent work on adversarial attack has shown that Projected Gradient Descent
(PGD) Adversary is a universal first-order adversary, and the classifier
adversarially trained by PGD is robust against a wide range of first-order
attacks. It is worth noting that the original objective of an attack/defense
model relies on a data distribution , typically in the form of
risk maximization/minimization, e.g.,
with
some unknown data distribution and a loss
function. However, since PGD generates attack samples independently for each
data sample based on , the procedure does not necessarily
lead to good generalization in terms of risk optimization. In this paper, we
achieve the goal by proposing distributionally adversarial attack (DAA), a
framework to solve an optimal {\em adversarial-data distribution}, a perturbed
distribution that satisfies the constraint but deviates from the
original data distribution to increase the generalization risk maximally.
Algorithmically, DAA performs optimization on the space of potential data
distributions, which introduces direct dependency between all data points when
generating adversarial samples. DAA is evaluated by attacking state-of-the-art
defense models, including the adversarially-trained models provided by {\em MIT
MadryLab}. Notably, DAA ranks {\em the first place} on MadryLab's white-box
leaderboards, reducing the accuracy of their secret MNIST model to
(with perturbations of ) and the accuracy of their
secret CIFAR model to (with perturbations of ). Code for the experiments is released on
\url{https://github.com/tianzheng4/Distributionally-Adversarial-Attack}.Comment: accepted to AAAI-1
FID: Function Modeling-based Data-Independent and Channel-Robust Physical-Layer Identification
Trusted identification is critical to secure IoT devices. However, the
limited memory and computation power of low-end IoT devices prevent the direct
usage of conventional identification systems. RF fingerprinting is a promising
technique to identify low-end IoT devices since it only requires the RF signals
that most IoT devices can produce for communication. However, most existing RF
fingerprinting systems are data-dependent and/or not robust to impacts from
wireless channels. To address the above problems, we propose to exploit the
mathematical expression of the physical-layer process, regarded as a function
, for device identification.
is not directly derivable, so we further propose
a model to learn it and employ this function model as the device fingerprint in
our system, namely ID. Our proposed function model characterizes
the unique physical-layer process of a device that is independent of the
transmitted data, and hence, our system ID is data-independent and
thus resilient against signal replay attacks. Modeling and further separating
channel effects from the function model makes ID channel-robust.
We evaluate ID on thousands of random signal packets from
different devices in different environments and scenarios, and the overall
identification accuracy is over .Comment: Accepted to INFOCOM201
A MATHEMATICAL MODEL OF THE CORRUGATED PLATES PACKING OIL-WATER SEPARATOR
A new high-efficiency oil-water separator was developed by the authors and their coworkers
[1]. The device appears like a horizontal container. Except for the parts of intake
and outlet for water and the oil collecting chambers, the main body of this device is the
separation chamber, in which the inclined corrugated plates are used as the separation
medium
Detecting a set of entanglement measures in an unknown tripartite quantum state by local operations and classical communication
We propose a more general method for detecting a set of entanglement
measures, i.e. negativities, in an \emph{arbitrary} tripartite quantum state by
local operations and classical communication. To accomplish the detection task
using this method, three observers, Alice, Bob and Charlie, do not need to
perform the partial transposition maps by the structural physical
approximation; instead, they are only required to collectively measure some
functions via three local networks supplemented by a classical communication.
With these functions, they are able to determine the set of negativities
related to the tripartite quantum state.Comment: 16 pages, 2 figures, revte
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