114 research outputs found
A study on the relationships between playfulness, physical self-efficacy, and school happiness among middle school students participating in “0th-period physical education class” in South Korea
The purpose of this study is to create a scientific basis for the establishment of “0th-period physical education class” activities in schools in the future, with the expectation that the associations of morning exercise can be activated in the Korean educational community. To achieve this goal, the present study aimed to determine the relationship between the playfulness experienced during the early morning exercise of middle school students and their physical self-efficacy and education for happiness. To examine the model, questionnaires were collected from 296 middle school students located in Seoul and Gyeonggi-do, South Korea. Correlation analysis and standard multiple regression analysis were performed to analyze the data using the SPSS 21.0. The findings were as follows: First, the playfulness of the middle school “0th-period physical education class” had a significant effect on physical self-efficacy. Second, playfulness had a significant effect on education for happiness. Thirdly, physical self-efficacy was found to have a significant effect on education for happiness. Based on the results of this study, we suggest that a “0th-period physical education class” with various activities should be held during the legally required time in South Korea
DiffFace: Diffusion-based Face Swapping with Facial Guidance
In this paper, we propose a diffusion-based face swapping framework for the
first time, called DiffFace, composed of training ID conditional DDPM, sampling
with facial guidance, and a target-preserving blending. In specific, in the
training process, the ID conditional DDPM is trained to generate face images
with the desired identity. In the sampling process, we use the off-the-shelf
facial expert models to make the model transfer source identity while
preserving target attributes faithfully. During this process, to preserve the
background of the target image and obtain the desired face swapping result, we
additionally propose a target-preserving blending strategy. It helps our model
to keep the attributes of the target face from noise while transferring the
source facial identity. In addition, without any re-training, our model can
flexibly apply additional facial guidance and adaptively control the
ID-attributes trade-off to achieve the desired results. To the best of our
knowledge, this is the first approach that applies the diffusion model in face
swapping task. Compared with previous GAN-based approaches, by taking advantage
of the diffusion model for the face swapping task, DiffFace achieves better
benefits such as training stability, high fidelity, diversity of the samples,
and controllability. Extensive experiments show that our DiffFace is comparable
or superior to the state-of-the-art methods on several standard face swapping
benchmarks.Comment: Project Page: https://hxngiee.github.io/DiffFac
Layered Antiferromagnetism Induces Large Negative Magnetoresistance in the van der Waals Semiconductor CrSBr
The recent discovery of magnetism within the family of exfoliatable van der
Waals (vdW) compounds has attracted considerable interest in these materials
for both fundamental research and technological applications. However current
vdW magnets are limited by their extreme sensitivity to air, low ordering
temperatures, and poor charge transport properties. Here we report the magnetic
and electronic properties of CrSBr, an air-stable vdW antiferromagnetic
semiconductor that readily cleaves perpendicular to the stacking axis. Below
its N\'{e}el temperature, K, CrSBr adopts an A-type
antiferromagnetic structure with each individual layer ferromagnetically
ordered internally and the layers coupled antiferromagnetically along the
stacking direction. Scanning tunneling spectroscopy and photoluminescence (PL)
reveal that the electronic gap is eV with a
corresponding PL peak centered at eV. Using magnetotransport
measurements, we demonstrate strong coupling between magnetic order and
transport properties in CrSBr, leading to a large negative magnetoresistance
response that is unique amongst vdW materials. These findings establish CrSBr
as a promising material platform for increasing the applicability of vdW
magnets to the field of spin-based electronics
Invariant imbedding theory of mode conversion in inhomogeneous plasmas. II. Mode conversion in cold, magnetized plasmas with perpendicular inhomogeneity
A new version of the invariant imbedding theory for the propagation of
coupled waves in inhomogeneous media is applied to the mode conversion of high
frequency electromagnetic waves into electrostatic modes in cold, magnetized
and stratified plasmas. The cases where the external magnetic field is applied
perpendicularly to the direction of inhomogeneity and the electron density
profile is linear are considered. Extensive and numerically exact results for
the mode conversion coefficients, the reflectances and the wave electric and
magnetic field profiles inside the inhomogeneous plasma are obtained. The
dependences of mode conversion phenomena on the magnitude of the external
magnetic field, the incident angle and the wave frequency are explored in
detail.Comment: 11 figures, to be published in Physics of Plasma
Optimum Power Controller for Random Number Generator in the Crypto Module of Ubiquitous Computing Environment
Abstract. Critical cryptography applications require the production of an unpredictable and unbiased stream of binary data derived from a fundamental noise mechanism, which is quite difficult to create with a stable random bit stream, as required for statistical randomness, when using a random generator with only a hardware component. However, since all electronic systems are influenced by a finite bandwidth, 1/f noise, and other non-random influences, perfect randomness cannot be preserved by any practical system. Thus, when generating random numbers using an electronic circuit, a low-power white noise signal is amplified, then sampled at a constant sampling frequency. Yet, it is quite difficult to create an unbiased and stable random bit stream, as required for statistical randomness, when using a random generator with only a hardware component and in especially it has occur the drift phenomena of input power. Therefore if the randomness of output bit stream is beyond limits range, it is applied the regulation of input power range to take the output bit stream, through the evaluation of randomness by constant period of output bit stream. Accordingly, this paper proposes a method for stabilizing the input power of a random number generator using optimum power control mechanism in crypto module hardware. As such, the proposed scheme is designed to reduce the statistical property of a biased bit stream and optimize the input power to a random number generator engine in crypto module engine for ubiquitous computing
Reflection coefficient and localization length of waves in one-dimensional random media
We develop a novel and powerful method of exactly calculating various
transport characteristics of waves in one-dimensional random media with (or
without) coherent absorption or amplification. Using the method, we compute the
probability densities of the reflectance and of the phase of the reflection
coefficient, together with the localization length, of electromagnetic waves in
sufficiently long random dielectric media. We find substantial differences
between our exact results and the previous results obtained using the random
phase approximation (RPA). The probabilty density of the phase of the
reflection coefficient is highly nonuniform when either disorder or absorption
(or amplification) is strong. The probability density of the reflectance when
the absorption or amplification parameter is large is also quite different from
the RPA result. We prove that the probability densities in the amplifying case
are related to those in the absorbing case with the same magnitude of the
imaginary part of the dielectric permeability by exact dual relationships. From
the analysis of the average reflectance that shows a nonmonotonic dependence on
the absorption or amplification parameter, we obtain a useful criterion for the
applicability of the RPA. In the parameter regime where the RPA is invalid, we
find the exact localization length is substantially larger than the RPA
localization length.Comment: 16 pages, 9 figure
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