4,594 research outputs found
Aesthetically Relevant Image Captioning
Image aesthetic quality assessment (AQA) aims to assign numerical aesthetic
ratings to images whilst image aesthetic captioning (IAC) aims to generate
textual descriptions of the aesthetic aspects of images. In this paper, we
study image AQA and IAC together and present a new IAC method termed
Aesthetically Relevant Image Captioning (ARIC). Based on the observation that
most textual comments of an image are about objects and their interactions
rather than aspects of aesthetics, we first introduce the concept of Aesthetic
Relevance Score (ARS) of a sentence and have developed a model to automatically
label a sentence with its ARS. We then use the ARS to design the ARIC model
which includes an ARS weighted IAC loss function and an ARS based diverse
aesthetic caption selector (DACS). We present extensive experimental results to
show the soundness of the ARS concept and the effectiveness of the ARIC model
by demonstrating that texts with higher ARS's can predict the aesthetic ratings
more accurately and that the new ARIC model can generate more accurate,
aesthetically more relevant and more diverse image captions. Furthermore, a
large new research database containing 510K images with over 5 million comments
and 350K aesthetic scores, and code for implementing ARIC are available at
https://github.com/PengZai/ARIC.Comment: Aceepted by AAAI2023. Code and results available at
https://github.com/PengZai/ARI
Postnatal maintenance of the 5-Ht1a-Pet1 autoregulatory loop by serotonin in the raphe nuclei of the brainstem
BACKGROUND: Despite the importance of 5-HT1A as a major target for the action of several anxiolytics/antidepressant drugs, little is known about its regulation in central serotonin (5-hydroxytryptamine, 5-HT) neurons. RESULTS: We report that expression of 5-HT1A and the transcription factor Pet1 was impaired in the rostral raphe nuclei of mice lacking tryptophan hydroxylase 2 (Tph2) after birth. The downregulation of Pet1 was recapitulated in 5-Ht1a( -/- ) mice. Using an explant culture system, we show that reduction of Pet1 and 5-HT1A was rescued in Tph2( -/- ) brainstem by exogenous 5-HT. In contrast, 5-HT failed to rescue reduced expression of Pet1 in 5-Ht1a( -/- ) brainstem explant culture. CONCLUSIONS: These results suggest a causal relationship between 5-HT1A and Pet1, and reveal a potential mechanism by which 5-HT1A-Pet1 autoregulatory loop is maintained by 5-HT in a spatiotemporal-specific manner during postnatal development. Our results are relevant to understanding the pathophysiology of certain psychiatric and developmental disorders
Edge Charge Asymmetry in Top Pair Production at the LHC
In this brief report, we propose a new definition of charge asymmetry in top
pair production at the LHC, namely the edge charge asymmetry (ECA). ECA
utilizes the information of drifting direction only for single top (or
anti-top) with hadronically decay. Therefore ECA can be free from the
uncertainty arising from the missing neutrino in the event
reconstruction. Moreover rapidity of top (or anti-top) is required to be
greater than a critical value in order to suppress the symmetric
events mainly due to the gluon-gluon fusion process. In this paper
ECA is calculated up to next-to-leading order QCD in the standard model and the
choice of the optimal is investigated.Comment: 10 pages, 6 figure
Discriminating Different s via Asymmetries at the LHC
In practice the asymmetry, which is defined based on the angular distribution
of the final states in scattering or decay processes, can be utilized to
scrutinize underlying dynamics in and/or beyond the standard model (BSM). As
one of the possible BSM physics which might be discovered early at the LHC,
extra neutral gauge bosons s are theoretical well motivated. Once
s are discovered at the LHC, it is crucial to discriminate different
s in various BSM. In principle such task can be accomplished by
measuring the angular distribution of the final states which are produced via
-mediated processes. In the real data analysis, asymmetry is always
adopted. In literature several asymmetries have been proposed at the LHC. Based
on these works, we stepped further on to study how to optimize the asymmetries
in the left-right model and the sequential standard model, as the examples of
BSM. In this paper, we examined four kinds of asymmetries, namely
rapidity-dependent forward-backward asymmetry, one-side forward-backward
asymmetry, central charge asymmetry and edge charge asymmetry (see text for
details), with (), and as the
final states. In the calculations with and final states,
the QCD-induced higher order contributions to the asymmetric cross section were
also included. For each kind of final states, we estimated the four kinds of
asymmetries and especially the optimal cut usually associated with the
definition of the asymmetry. Our numerical results indicated that the capacity
to discriminate models can be improved by imposing the optimal cuts.Comment: 17 pages, 20 ps file
Dynamics of Bid-ask Spread Return and Volatility of the Chinese Stock Market
Bid-ask spread is taken as an important measure of the financial market
liquidity. In this article, we study the dynamics of the spread return and the
spread volatility of four liquid stocks in the Chinese stock market, including
the memory effect and the multifractal nature. By investigating the
autocorrelation function and the Detrended Fluctuation Analysis (DFA), we find
that the spread return is lack of long-range memory, while the spread
volatility is long-range time correlated. Moreover, by applying the
Multifractal Detrended Fluctuation Analysis (MF-DFA), the spread return is
observed to possess a strong multifractality, which is similar to the dynamics
of a variety of financial quantities. Differently from the spread return, the
spread volatility exhibits a weak multifractal nature
Memory effect and multifractality of cross-correlations in financial markets
An average instantaneous cross-correlation function is introduced to quantify
the interaction of the financial market of a specific time. Based on the daily
data of the American and Chinese stock markets, memory effect of the average
instantaneous cross-correlations is investigated over different price return
time intervals. Long-range time-correlations are revealed, and are found to
persist up to a month-order magnitude of the price return time interval.
Multifractal nature is investigated by a multifractal detrended fluctuation
analysis.Comment: 11 pages, 4 figures
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