1,272 research outputs found
Admissibility of linear predictor in the extended growth curve model
In the present paper, we first give the definition of the extended growth curve model, then according to the definition of admissible linear predictor and some matrix properties, obtain the necessary and sufficient conditions for a linear predictor to be admissible in the classes of homogenous and inhomogeneous linear predictors, respectively
Impact of Macroeconomic Variables on Stock Price Index: Evidence from Vietnam Stock Market
Vietnam stock market after nearly 20 years of operation has undergone many ups and downs. In addition to the contribution to the development of the national economy, the Vietnam Stock market still has some certain shortcomings. Goods on the market have increased in size, quantity, and categories but not much of diversity. The potential risks due to many different causes, always hurt investors. Therefore, the study of Macroeconomic factors affecting the volatility of stock indexes has been paid special attention by society. Research results show that, in the long term, the VNI stock price index is affected by the oil price, money supply, interest rate, SJC gold price, and exchange rate. In the short term, the stock price index has a causal relationship with oil prices, interest rates, and the M2 money supply. When there are impacts of market shocks, short-term corrections affect extremely slow to the long-term balance. Keywords: macroeconomic factors, VNI, Vietnam stock market, ECM, VAR DOI: 10.7176/RJFA/10-12-04 Publication date:June 30th 2019
Long and Diverse Text Generation with Planning-based Hierarchical Variational Model
Existing neural methods for data-to-text generation are still struggling to
produce long and diverse texts: they are insufficient to model input data
dynamically during generation, to capture inter-sentence coherence, or to
generate diversified expressions. To address these issues, we propose a
Planning-based Hierarchical Variational Model (PHVM). Our model first plans a
sequence of groups (each group is a subset of input items to be covered by a
sentence) and then realizes each sentence conditioned on the planning result
and the previously generated context, thereby decomposing long text generation
into dependent sentence generation sub-tasks. To capture expression diversity,
we devise a hierarchical latent structure where a global planning latent
variable models the diversity of reasonable planning and a sequence of local
latent variables controls sentence realization. Experiments show that our model
outperforms state-of-the-art baselines in long and diverse text generation.Comment: To appear in EMNLP 201
A Dynamic Graph Interactive Framework with Label-Semantic Injection for Spoken Language Understanding
Multi-intent detection and slot filling joint models are gaining increasing
traction since they are closer to complicated real-world scenarios. However,
existing approaches (1) focus on identifying implicit correlations between
utterances and one-hot encoded labels in both tasks while ignoring explicit
label characteristics; (2) directly incorporate multi-intent information for
each token, which could lead to incorrect slot prediction due to the
introduction of irrelevant intent. In this paper, we propose a framework termed
DGIF, which first leverages the semantic information of labels to give the
model additional signals and enriched priors. Then, a multi-grain interactive
graph is constructed to model correlations between intents and slots.
Specifically, we propose a novel approach to construct the interactive graph
based on the injection of label semantics, which can automatically update the
graph to better alleviate error propagation. Experimental results show that our
framework significantly outperforms existing approaches, obtaining a relative
improvement of 13.7% over the previous best model on the MixATIS dataset in
overall accuracy.Comment: Submitted to ICASSP 202
Sirolimus increases tissue factor expression but not activity in cultured human vascular smooth muscle cells
BACKGROUND: Sirolimus-eluting stents (CYPHER stents) demonstrated remarkable efficacy in reducing restenosis rates in patients with coronary artery disease. There is a concern of sub-acute and late stent thrombosis. Tissue factor (TF) is critical in thrombosis. This study investigated the effect of sirolimus on TF expression and activity in cultured human vascular smooth muscle cells (SMCs). METHODS: SMCs were cultured from human saphenous veins and aortas. Quiescent cells were stimulated with sirolimus (0.1 – 20 ng/ml) over 24 hours. Cellular TF expression and activity released into culture medium were measured. The effect of sirolimus on activation of mammalian target of rapamycin (mTOR) was measured by phosphorylation of the substrate p70s6k at T389, and activation of RhoA was measured by pull-down assay. RESULTS: Sirolimus increased TF protein level in cultured human SMCs in a concentration and time-dependent manner (about 2-fold, p < 0.01) reaching maximal effect at 5 ng/ml. The stimulation of TF expression by sirolimus was associated with inhibition of basal activity of mTOR. No effects of sirolimus on RhoA or p38mapk activation that are positive regulators of TF in vascular wall cells were observed. The stimulation of TF expression by sirolimus (20 ng/ml) was prevented by the HMG-CoA reductase inhibitor fluvastatin (1 μmol/L). However, no increase in TF activity released from SMC into culture medium was observed after sirolimus treatment. CONCLUSION: Although sirolimus stimulates TF protein expression in human SMC associated with inhibition of mTOR, it does not enhance TF activity released from the cells, suggesting a relatively safe profile of CYPHER stents. The inhibition of TF expression by fluvastatin favors clinical use of statins in patients undergoing coronary stenting
Exploiting Prompt Caption for Video Grounding
Video grounding aims to locate a moment of interest matching the given query
sentence from an untrimmed video. Previous works ignore the \emph{sparsity
dilemma} in video annotations, which fails to provide the context information
between potential events and query sentences in the dataset. In this paper, we
contend that exploiting easily available captions which describe general
actions \ie, prompt captions (PC) defined in our paper, will significantly
boost the performance. To this end, we propose a Prompt Caption Network (PCNet)
for video grounding. Specifically, we first introduce dense video captioning to
generate dense captions and then obtain prompt captions by Non-Prompt Caption
Suppression (NPCS). To capture the potential information in prompt captions, we
propose Caption Guided Attention (CGA) project the semantic relations between
prompt captions and query sentences into temporal space and fuse them into
visual representations. Considering the gap between prompt captions and ground
truth, we propose Asymmetric Cross-modal Contrastive Learning (ACCL) for
constructing more negative pairs to maximize cross-modal mutual information.
Without bells and whistles, extensive experiments on three public datasets
(\ie, ActivityNet Captions, TACoS and ActivityNet-CG) demonstrate that our
method significantly outperforms state-of-the-art methods
G2L: Semantically Aligned and Uniform Video Grounding via Geodesic and Game Theory
The recent video grounding works attempt to introduce vanilla contrastive
learning into video grounding. However, we claim that this naive solution is
suboptimal. Contrastive learning requires two key properties: (1)
\emph{alignment} of features of similar samples, and (2) \emph{uniformity} of
the induced distribution of the normalized features on the hypersphere. Due to
two annoying issues in video grounding: (1) the co-existence of some visual
entities in both ground truth and other moments, \ie semantic overlapping; (2)
only a few moments in the video are annotated, \ie sparse annotation dilemma,
vanilla contrastive learning is unable to model the correlations between
temporally distant moments and learned inconsistent video representations. Both
characteristics lead to vanilla contrastive learning being unsuitable for video
grounding. In this paper, we introduce Geodesic and Game Localization (G2L), a
semantically aligned and uniform video grounding framework via geodesic and
game theory. We quantify the correlations among moments leveraging the geodesic
distance that guides the model to learn the correct cross-modal
representations. Furthermore, from the novel perspective of game theory, we
propose semantic Shapley interaction based on geodesic distance sampling to
learn fine-grained semantic alignment in similar moments. Experiments on three
benchmarks demonstrate the effectiveness of our method.Comment: ICCV202
- …