888 research outputs found
Chinese National Day Civilian Parades And the signaling of policy change in the Reform Era
HonorsPolitical ScienceUniversity of Michiganhttp://deepblue.lib.umich.edu/bitstream/2027.42/167900/1/kccpliu.pd
Diffuse gamma-ray emission around the Rosette Nebula
The Rosette Nebula is a young stellar cluster and molecular cloud complex,
located at the edge of the southern shell of a middle-aged SNR Monoceros Loop
(G205.5+0.5). We revisited the GeV gamma-ray emission towards the Rosette
Nebula using more than 13 years of Fermi-LAT data. We tested several spatial
models and found that compared to the result using the CO gas template only,
the inclusion of the HII gas template can significantly improve the likelihood
fit. We performed spectral analysis using the new spatial template. With both
the gamma-ray observation and CO+HII gas data, we derived the cosmic ray
spectrum of different components in the vicinity of the Rosette Nebula. We
found the gamma-ray emissions from Rosette Nebula are substantially harder than
previously reported, which may imply that Rosette Nebula is another example of
a gamma-ray emitting young massive star cluster.Comment: 6 pages, 5 figures, published in MNRA
LSTM Pose Machines
We observed that recent state-of-the-art results on single image human pose
estimation were achieved by multi-stage Convolution Neural Networks (CNN).
Notwithstanding the superior performance on static images, the application of
these models on videos is not only computationally intensive, it also suffers
from performance degeneration and flicking. Such suboptimal results are mainly
attributed to the inability of imposing sequential geometric consistency,
handling severe image quality degradation (e.g. motion blur and occlusion) as
well as the inability of capturing the temporal correlation among video frames.
In this paper, we proposed a novel recurrent network to tackle these problems.
We showed that if we were to impose the weight sharing scheme to the
multi-stage CNN, it could be re-written as a Recurrent Neural Network (RNN).
This property decouples the relationship among multiple network stages and
results in significantly faster speed in invoking the network for videos. It
also enables the adoption of Long Short-Term Memory (LSTM) units between video
frames. We found such memory augmented RNN is very effective in imposing
geometric consistency among frames. It also well handles input quality
degradation in videos while successfully stabilizes the sequential outputs. The
experiments showed that our approach significantly outperformed current
state-of-the-art methods on two large-scale video pose estimation benchmarks.
We also explored the memory cells inside the LSTM and provided insights on why
such mechanism would benefit the prediction for video-based pose estimations.Comment: Poster in IEEE Conference on Computer Vision and Pattern Recognition
(CVPR), 201
Dynamic analysis and control of strip mill vibration under the coupling effect of roll and rolled piece
According to the “Hill rolling force formula”, taking particular account of the influence from horizontal vibration of rolled piece in roll gap, a dynamic rolling force model is analyzed. Considering the interaction between vibration of strip and roll, the dynamic vibration model of rolling mill is established. On this basis, the time delayed feedback is introduced to control the vibration of the roll system. The amplitude frequency response of the coupled vibration control equation is obtained by using the multiple scales method. Different time delay parameters are selected to test the control effect. Research results show that the unstable vibration of the roll system can be suppressed with appropriate time delay feedback parameters. Because it is simpler and has good control effect in solving nonlinear mechanical vibration, so these results will make a difference for the research of strip mill vibration, and provide theoretical basis for strip steel production
On symbology and differential equations of Feynman integrals from Schubert analysis
We take the first step in generalizing the so-called "Schubert analysis",
originally proposed in twistor space for four-dimensional kinematics, to the
study of symbol letters and more detailed information on canonical differential
equations for Feynman integral families in general dimensions with general
masses. The basic idea is to work in embedding space and compute possible
cross-ratios built from (Lorentz products of) maximal cut solutions for all
integrals in the family. We demonstrate the power of the method using the most
general one-loop integrals, as well as various two-loop planar integral
families (such as sunrise, double-triangle and double-box) in general
dimensions. Not only can we obtain all symbol letters as cross-ratios from
maximal-cut solutions, but we also reproduce entries in the canonical
differential equations satisfied by a basis of dlog integrals.Comment: 51 pages, many figure
Tai Chi Can Improve Postural Stability as Measured by Resistance to Perturbation Related to Upper Limb Movement Among Healthy Older Adults
Purpose: The aim of the study was to examine the effects of Tai Chi (TC) training on postural control when upright standing was perturbed by upper limb movement.
Methods: Three groups, TC, Brisk walk (BW), and sedentary (SE), of thirty-six participants aged from 65 to 75 years were recruited from local community centers. Participants performed static balance task (quiet standing for 30 s with eyes open and closed) and fitting task (two different reaching distances X three different opening sizes to fit objects through). During tasks, the COP data was recorded while standing on the force plate. Criteria measures calculated from COP data were the maximum displacement in anterior-posterior (AP) and medial-lateral (ML) directions, the 95% confidence ellipse area (95% area), and the mean velocity.
Results: No significant effect was observed in the static balance task. For fitting tasks, the group effect was observed in all directions on COP 95% area (p \u3c 0.05) and the TC group showed reduced area. The tests of subject contrasts showed significant trends for reaching different distances and fitting different openings conditions in all directions, the 95% area, and the mean velocity (p \u3c 0.05).
Conclusion: Compared to the other two groups, long-term TC exercise helps in reducing the effects of upper body perturbation as measured by posture sway
Accurate Single Stage Detector Using Recurrent Rolling Convolution
Most of the recent successful methods in accurate object detection and
localization used some variants of R-CNN style two stage Convolutional Neural
Networks (CNN) where plausible regions were proposed in the first stage then
followed by a second stage for decision refinement. Despite the simplicity of
training and the efficiency in deployment, the single stage detection methods
have not been as competitive when evaluated in benchmarks consider mAP for high
IoU thresholds. In this paper, we proposed a novel single stage end-to-end
trainable object detection network to overcome this limitation. We achieved
this by introducing Recurrent Rolling Convolution (RRC) architecture over
multi-scale feature maps to construct object classifiers and bounding box
regressors which are "deep in context". We evaluated our method in the
challenging KITTI dataset which measures methods under IoU threshold of 0.7. We
showed that with RRC, a single reduced VGG-16 based model already significantly
outperformed all the previously published results. At the time this paper was
written our models ranked the first in KITTI car detection (the hard level),
the first in cyclist detection and the second in pedestrian detection. These
results were not reached by the previous single stage methods. The code is
publicly available.Comment: CVPR 201
Enhancing Graph Collaborative Filtering via Uniformly Co-Clustered Intent Modeling
Graph-based collaborative filtering has emerged as a powerful paradigm for
delivering personalized recommendations. Despite their demonstrated
effectiveness, these methods often neglect the underlying intents of users,
which constitute a pivotal facet of comprehensive user interests. Consequently,
a series of approaches have arisen to tackle this limitation by introducing
independent intent representations. However, these approaches fail to capture
the intricate relationships between intents of different users and the
compatibility between user intents and item properties.
To remedy the above issues, we propose a novel method, named uniformly
co-clustered intent modeling. Specifically, we devise a uniformly contrastive
intent modeling module to bring together the embeddings of users with similar
intents and items with similar properties. This module aims to model the
nuanced relations between intents of different users and properties of
different items, especially those unreachable to each other on the user-item
graph. To model the compatibility between user intents and item properties, we
design the user-item co-clustering module, maximizing the mutual information of
co-clusters of users and items. This approach is substantiated through
theoretical validation, establishing its efficacy in modeling compatibility to
enhance the mutual information between user and item representations.
Comprehensive experiments on various real-world datasets verify the
effectiveness of the proposed framework.Comment: In submissio
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