64 research outputs found
Semantic Role Labeling Guided Out-of-distribution Detection
Identifying unexpected domain-shifted instances in natural language
processing is crucial in real-world applications. Previous works identify the
OOD instance by leveraging a single global feature embedding to represent the
sentence, which cannot characterize subtle OOD patterns well. Another major
challenge current OOD methods face is learning effective low-dimensional
sentence representations to identify the hard OOD instances that are
semantically similar to the ID data. In this paper, we propose a new
unsupervised OOD detection method, namely Semantic Role Labeling Guided
Out-of-distribution Detection (SRLOOD), that separates, extracts, and learns
the semantic role labeling (SRL) guided fine-grained local feature
representations from different arguments of a sentence and the global feature
representations of the full sentence using a margin-based contrastive loss. A
novel self-supervised approach is also introduced to enhance such global-local
feature learning by predicting the SRL extracted role. The resulting model
achieves SOTA performance on four OOD benchmarks, indicating the effectiveness
of our approach. Codes will be available upon acceptance
Stock Market Prediction via Deep Learning Techniques: A Survey
The stock market prediction has been a traditional yet complex problem
researched within diverse research areas and application domains due to its
non-linear, highly volatile and complex nature. Existing surveys on stock
market prediction often focus on traditional machine learning methods instead
of deep learning methods. Deep learning has dominated many domains, gained much
success and popularity in recent years in stock market prediction. This
motivates us to provide a structured and comprehensive overview of the research
on stock market prediction focusing on deep learning techniques. We present
four elaborated subtasks of stock market prediction and propose a novel
taxonomy to summarize the state-of-the-art models based on deep neural networks
from 2011 to 2022. In addition, we also provide detailed statistics on the
datasets and evaluation metrics commonly used in the stock market. Finally, we
highlight some open issues and point out several future directions by sharing
some new perspectives on stock market prediction
A novel application of a polarization microscope for the study of microbiological specimens
Aspergillus niger was used to demonstrate a novel application of a polarization microscope for the study of microbiological specimens. The results showed that conidiophores of A. niger contain optically anisotropic material but hyphae and hyphal branches are optically isotropic. This method could become a useful tool in identification
Spinning the supercooled PET to obtain highly oriented and crystallized PET fibers at low speeds
An attempt has been made to investigate the feasibility for a novel concept of supercooled spinning to obtain orientation-induced crystallization at speeds lower than that for the high-speed spinning technology. This is achieved by setting the nozzle temperature lower than the melting point for PET, making the polymer a supercooled fluidic liquid, and then spinning the supercooled. The experimental results show that high orientation and high crystallinity can be achieved at a spinning speed of 2500 m/min, which is in good comparison with a speed of 5000-6000 m/min to obtain similar degree of orientation and crystallinity in the high-speed spinning. The properties of the as-spun fibers obtained by supercooled spinning were analyzed, and a rational theoretical account for the supercooled spinning is explored
Numerical simulation of DSC and TMDSC curves as well as reversing and nonreversing curve separation
The basic physical meaning of temperature modulation for DSC is an arguable research topic, and its interpretation affects the development of thermal analysis and polymer science. This article studies the basic physical meaning of TMDSC by numerical simulation. DSC and TMDSC output curves are computed for a sample with step changes in its specific heat and for a sample with crystallites melting over the temperature range. The TMDSC curves are further analyzed to obtain the reversing and nonreversing components. It is shown that separation of the reversing and nonreversing components from the underlying heat flow cannot be justified. Some common misconceptions regarding TMDSC are discussed as well
Obtaining the critical draw ratio of draw resonance in melt spinning for power law polymer fluids
A direct difference method has been developed for Non-Newtonian power law fluids to solve the simultaneous non-linear partial differential equations of melt spinning, and to determine the critical draw ratio for draw resonance. The results show that for shear thin fluids, the logarithm of the critical draw ratio has a well defined linear relationship with the power index for isothermal and uniform tension melt spinning. When the power index approaches zero, the critical draw ratio points at unity, indicating no melt spinning can be processed stably for such fluids. For shear thick fluids, the critical draw ratio increases in a more rapid way with increasing the power index
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