142 research outputs found
The Influence Mechanism of Overseas Investment Bank Rating On Stock Fluctuation of Chinese Internet Enterprises in a Credit Crisis
Whether the efficiency information of China\u27s Internet enterprises which are listed overseas can be effectively transferred to capital market during a credit crisis, the rating information provided by investment banks should be a crucial bridge for listed firms and investors. In order to probe the influence mechanism of the rating information provided by investment bank, we choose Chinese concept stocks related to a credit crisis in the United States capital market in 2011 to do our empirical research. Our study found that, the timing of release of rating reports, target stock price and enterprise target market play significant influence on the fluctuation of stock prices, and the ranking of investment bank has played an important moderating role
Sharp bounds for a class of integral operators in weighted-type spaces on Heisenberg group
In this paper, we will use the conclusions and methods in \cite{1} to obtain
the sharp bounds for a class of integral operators with the nonnegative kernels
in weighted-type spaces on Heisenberg group. As promotions, the sharp bounds of
Hardy operator , Hardy Littlewood-P\'{o}lya operator and Hilbert operator are
also obtained
DPM-OT: A New Diffusion Probabilistic Model Based on Optimal Transport
Sampling from diffusion probabilistic models (DPMs) can be viewed as a
piecewise distribution transformation, which generally requires hundreds or
thousands of steps of the inverse diffusion trajectory to get a high-quality
image. Recent progress in designing fast samplers for DPMs achieves a trade-off
between sampling speed and sample quality by knowledge distillation or
adjusting the variance schedule or the denoising equation. However, it can't be
optimal in both aspects and often suffer from mode mixture in short steps. To
tackle this problem, we innovatively regard inverse diffusion as an optimal
transport (OT) problem between latents at different stages and propose the
DPM-OT, a unified learning framework for fast DPMs with a direct expressway
represented by OT map, which can generate high-quality samples within around 10
function evaluations. By calculating the semi-discrete optimal transport map
between the data latents and the white noise, we obtain an expressway from the
prior distribution to the data distribution, while significantly alleviating
the problem of mode mixture. In addition, we give the error bound of the
proposed method, which theoretically guarantees the stability of the algorithm.
Extensive experiments validate the effectiveness and advantages of DPM-OT in
terms of speed and quality (FID and mode mixture), thus representing an
efficient solution for generative modeling. Source codes are available at
https://github.com/cognaclee/DPM-OTComment: iccv2023 accepte
A Temporal Densely Connected Recurrent Network for Event-based Human Pose Estimation
Event camera is an emerging bio-inspired vision sensors that report per-pixel
brightness changes asynchronously. It holds noticeable advantage of high
dynamic range, high speed response, and low power budget that enable it to best
capture local motions in uncontrolled environments. This motivates us to unlock
the potential of event cameras for human pose estimation, as the human pose
estimation with event cameras is rarely explored. Due to the novel paradigm
shift from conventional frame-based cameras, however, event signals in a time
interval contain very limited information, as event cameras can only capture
the moving body parts and ignores those static body parts, resulting in some
parts to be incomplete or even disappeared in the time interval. This paper
proposes a novel densely connected recurrent architecture to address the
problem of incomplete information. By this recurrent architecture, we can
explicitly model not only the sequential but also non-sequential geometric
consistency across time steps to accumulate information from previous frames to
recover the entire human bodies, achieving a stable and accurate human pose
estimation from event data. Moreover, to better evaluate our model, we collect
a large scale multimodal event-based dataset that comes with human pose
annotations, which is by far the most challenging one to the best of our
knowledge. The experimental results on two public datasets and our own dataset
demonstrate the effectiveness and strength of our approach. Code can be
available online for facilitating the future research
The Protective Effects of Trypsin Inhibitor on Hepatic Ischemia-Reperfusion Injury and Liver Graft Survival
The aim of this study was to explore the protective effects of ulinastatin (urinary trypsin inhibitor, UTI) on liver ischemia-reperfusion injury (IRI) and graft survival. We employed mouse liver cold IRI and orthotopic liver transplantation (OLTx) models. UTI was added to lactated Ringer’s (LR) solution for liver perfusion and preservation in vitro or combined with UTI injection intraperitoneally to the liver graft recipient. Our results indicated that UTI supplementation protected the liver from cold IRI in a dose-dependent manner and prolonged liver graft survival from extended cold preserved liver donors significantly. The underlying mechanism of UTI on liver IRI may be mediated by inhibition of proinflammatory cytokine release, increasing the expression of the antiapoptotic gene Bcl-2 and decreasing the expression of the proapoptosis genes of Caspase-3 and Bax, and further protects hepatocytes from apoptotic death and improves liver function
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