155 research outputs found
Semantic Communications for Image Recovery and Classification via Deep Joint Source and Channel Coding
With the recent advancements in edge artificial intelligence (AI), future
sixth-generation (6G) networks need to support new AI tasks such as
classification and clustering apart from data recovery. Motivated by the
success of deep learning, the semantic-aware and task-oriented communications
with deep joint source and channel coding (JSCC) have emerged as new paradigm
shifts in 6G from the conventional data-oriented communications with separate
source and channel coding (SSCC). However, most existing works focused on the
deep JSCC designs for one task of data recovery or AI task execution
independently, which cannot be transferred to other unintended tasks.
Differently, this paper investigates the JSCC semantic communications to
support multi-task services, by performing the image data recovery and
classification task execution simultaneously. First, we propose a new
end-to-end deep JSCC framework by unifying the coding rate reduction
maximization and the mean square error (MSE) minimization in the loss function.
Here, the coding rate reduction maximization facilitates the learning of
discriminative features for enabling to perform classification tasks directly
in the feature space, and the MSE minimization helps the learning of
informative features for high-quality image data recovery. Next, to further
improve the robustness against variational wireless channels, we propose a new
gated deep JSCC design, in which a gated net is incorporated for adaptively
pruning the output features to adjust their dimensions based on channel
conditions. Finally, we present extensive numerical experiments to validate the
performance of our proposed deep JSCC designs as compared to various benchmark
schemes
Novel silica filled deep eutectic solvent based nanofluids for energy transportation
Liquid range of nanofluids is a crucial parameter as it intensively determines their application temperature scope. Meanwhile, improved thermal conductivity and stability are of great significances and comprise the main fundamental research topics of nanofluids. In this work, 2- butoxy-3,4-dihydropyran (DP), produced from a convenient one-pot three-component reaction in water, was employed as dual lipophilic brusher and metal nanoparticle anchor. It was found that DP was able to enhance the dispersing ability and thermal conductivity of SiO2 nanoparticle filled deep eutectic solvent (DES) based nanofluids simultaneously. The key to the success of this protocol mainly relies on the electrophilic property and acetylacetonate moiety of DP, which ensures the formation of DP surficial modified and copper nanoparticle coated silica. Molecular dynamics simulation revealed that the hydrogen bonding effect between base solvent and alkane chain of nanoparticle was responsible for the enhanced affinity, which thus resulted in an improved stability. Viscosities of the nanofluids dropped within a certain range owing to the ruin of hydrogen bonding association among solvent molecules resulted by the hydrogen bonding effect between nanoparticle and solvent. Thermal conductivity of the copper modified silica filled DES nanofluids exhibits a maximum 13.6% enhancement, which demonstrated the advantages of this chemical covalent protocol. Additionally, study upon viscosity and convective heat transfer coefficient of the nanofluids with varies types of silica nanoparticle and DES base solvents indicated that a 24.9% heat transfer coefficient enhancement was gained that further revealed the superiority of this protocol
Novel Silica Filled Deep Eutectic Solvent Based Nanofluids for Energy Transportation
Liquid range of nanofluids is a crucial parameter as it intensively determines their application temperature scope. Meanwhile, improved thermal conductivity and stability are of great significances and comprise the main fundamental research topics of nanofluids. In this work, 2-butoxy-3,4-dihydropyran (DP), produced from a convenient one-pot three-component reaction in water, was employed as dual lipophilic brusher and metal nanoparticle anchor. It was found that DP was able to enhance the dispersing ability and thermal conductivity of SiO2 nanoparticle filled deep eutectic solvent (DES) based nanofluids simultaneously. The key to the success of this protocol mainly relies on the electrophilic property and acetylacetonate moiety of DP, which ensures the formation of DP surficial modified and copper nanoparticle coated silica. Molecular dynamics simulation revealed that the hydrogen bonding effect between base solvent and alkane chain of nanoparticle was responsible for the enhanced affinity, which thus resulted in an improved stability. Viscosities of the nanofluids dropped within a certain range owing to the ruin of hydrogen bonding association among solvent molecules resulted by the hydrogen bonding effect between nanoparticle and solvent. Thermal conductivity of the copper modified silica filled DES nanofluids exhibits a maximum 13.6% enhancement, which demonstrated the advantages of this chemical covalent protocol. Additionally, study upon viscosity and convective heat transfer coefficient of the nanofluids with varies types of silica nanoparticle and DES base solvents indicated that a 24.9% heat transfer coefficient enhancement was gained that further revealed the superiority of this protocol
Improvement of Printing Quality for Laser-induced Forward Transfer based Laser-Assisted Bioprinting Process using a CFD-based numerical model
As one of the three-dimensional (3D) bioprinting techniques with great application potential, laser-induced-forward-transfer (LIFT) based laser assisted bioprinting (LAB) transfers the bioink through a developed jet flow, and the printing quality highly depends on the stability of jet flow regime. To understand the connection between the jet flow and printing outcomes, a Computational Fluid Dynamic (CFD) model was developed for the first time to accurately describe the jet flow regime and provide a guidance for optimal printing process planning. By adopting the printing parameters recommended by the CFD model, the printing quality was greatly improved by forming stable jet regime and organized printing patterns on the substrate, and the size of printed droplet can also be accurately predicted through a static equilibrium model. The ultimate goal of this research is to direct the LIFT-based LAB process and eventually improve the quality of bioprinting
UniMa at SemEval-2018 Task 7 : semantic relation extraction and classification from scientific publications
Large repositories of scientific literature
call for the development of robust methods
to extract information from scholarly
papers. This problem is addressed by the
SemEval 2018 Task 7 on extracting and
classifying relations found within scientific
publications. In this paper, we present
a feature-based and a deep learning-based
approach to the task and discuss the results
of the system runs that we submitted for
evaluation
SongMASS: Automatic Song Writing with Pre-training and Alignment Constraint
Automatic song writing aims to compose a song (lyric and/or melody) by
machine, which is an interesting topic in both academia and industry. In
automatic song writing, lyric-to-melody generation and melody-to-lyric
generation are two important tasks, both of which usually suffer from the
following challenges: 1) the paired lyric and melody data are limited, which
affects the generation quality of the two tasks, considering a lot of paired
training data are needed due to the weak correlation between lyric and melody;
2) Strict alignments are required between lyric and melody, which relies on
specific alignment modeling. In this paper, we propose SongMASS to address the
above challenges, which leverages masked sequence to sequence (MASS)
pre-training and attention based alignment modeling for lyric-to-melody and
melody-to-lyric generation. Specifically, 1) we extend the original
sentence-level MASS pre-training to song level to better capture long
contextual information in music, and use a separate encoder and decoder for
each modality (lyric or melody); 2) we leverage sentence-level attention mask
and token-level attention constraint during training to enhance the alignment
between lyric and melody. During inference, we use a dynamic programming
strategy to obtain the alignment between each word/syllable in lyric and note
in melody. We pre-train SongMASS on unpaired lyric and melody datasets, and
both objective and subjective evaluations demonstrate that SongMASS generates
lyric and melody with significantly better quality than the baseline method
without pre-training or alignment constraint
Pushing AI to Wireless Network Edge: An Overview on Integrated Sensing, Communication, and Computation towards 6G
Pushing artificial intelligence (AI) from central cloud to network edge has
reached board consensus in both industry and academia for materializing the
vision of artificial intelligence of things (AIoT) in the sixth-generation (6G)
era. This gives rise to an emerging research area known as edge intelligence,
which concerns the distillation of human-like intelligence from the huge amount
of data scattered at wireless network edge. In general, realizing edge
intelligence corresponds to the process of sensing, communication, and
computation, which are coupled ingredients for data generation, exchanging, and
processing, respectively. However, conventional wireless networks design the
sensing, communication, and computation separately in a task-agnostic manner,
which encounters difficulties in accommodating the stringent demands of
ultra-low latency, ultra-high reliability, and high capacity in emerging AI
applications such as auto-driving. This thus prompts a new design paradigm of
seamless integrated sensing, communication, and computation (ISCC) in a
task-oriented manner, which comprehensively accounts for the use of the data in
the downstream AI applications. In view of its growing interest, this article
provides a timely overview of ISCC for edge intelligence by introducing its
basic concept, design challenges, and enabling techniques, surveying the
state-of-the-art development, and shedding light on the road ahead
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