77 research outputs found
Resource Allocation for Capacity Optimization in Joint Source-Channel Coding Systems
Benefited from the advances of deep learning (DL) techniques, deep joint
source-channel coding (JSCC) has shown its great potential to improve the
performance of wireless transmission. However, most of the existing works focus
on the DL-based transceiver design of the JSCC model, while ignoring the
resource allocation problem in wireless systems. In this paper, we consider a
downlink resource allocation problem, where a base station (BS) jointly
optimizes the compression ratio (CR) and power allocation as well as resource
block (RB) assignment of each user according to the latency and performance
constraints to maximize the number of users that successfully receive their
requested content with desired quality. To solve this problem, we first
decompose it into two subproblems without loss of optimality. The first
subproblem is to minimize the required transmission power for each user under
given RB allocation. We derive the closed-form expression of the optimal
transmit power by searching the maximum feasible compression ratio. The second
one aims at maximizing the number of supported users through optimal user-RB
pairing, which we solve by utilizing bisection search as well as Karmarka' s
algorithm. Simulation results validate the effectiveness of the proposed
resource allocation method in terms of the number of satisfied users with given
resources.Comment: 6 pages, 6 figure
MIMO Precoding Design with QoS and Per-Antenna Power Constraints
Precoding design for the downlink of multiuser multiple-input multiple-output
(MU-MIMO) systems is a fundamental problem. In this paper, we aim to maximize
the weighted sum rate (WSR) while considering both quality-of-service (QoS)
constraints of each user and per-antenna power constraints (PAPCs) in the
downlink MU-MIMO system. To solve the problem, we reformulate the original
problem to an equivalent problem by using the well-known weighted minimal mean
square error (WMMSE) framework, which can be tackled by iteratively solving
three subproblems. Since the precoding matrices are coupled among the QoS
constraints and PAPCs, we adopt alternating direction method of multipliers
(ADMM) to obtain a distributed solution. Simulation results validate the
effectiveness of the proposed algorithm
Semantic-aware Transmission for Robust Point Cloud Classification
As three-dimensional (3D) data acquisition devices become increasingly
prevalent, the demand for 3D point cloud transmission is growing. In this
study, we introduce a semantic-aware communication system for robust point
cloud classification that capitalizes on the advantages of pre-trained
Point-BERT models. Our proposed method comprises four main components: the
semantic encoder, channel encoder, channel decoder, and semantic decoder. By
employing a two-stage training strategy, our system facilitates efficient and
adaptable learning tailored to the specific classification tasks. The results
show that the proposed system achieves classification accuracy of over 89\%
when SNR is higher than 10 dB and still maintains accuracy above 66.6\% even at
SNR of 4 dB. Compared to the existing method, our approach performs at 0.8\% to
48\% better across different SNR values, demonstrating robustness to channel
noise. Our system also achieves a balance between accuracy and speed, being
computationally efficient while maintaining high classification performance
under noisy channel conditions. This adaptable and resilient approach holds
considerable promise for a wide array of 3D scene understanding applications,
effectively addressing the challenges posed by channel noise.Comment: submitted to globecom 202
Seismic response analysis on shear lag effect of continuous curved box girder with three spans
Shear lag effect of continuous curved box girder with three spans under seismic excitation is studied in this paper. Firstly, spatial shell finite element model is founded by ANSYS, and EL-centro seismic wave is chosen as seismic excitation. Secondly, the shear lag effect at different cross sections are investigated with dynamic time-history analysis, the results show that under seismic excitation there is prominent shear lag effect in continuous curved box girder, the maximum shear lag coefficient is 3.02, shear lag effect is severe, shear lag effect at mid-span cross sections are prominent than support cross sections, and inside peak shear lag coefficients are generally greater than outside. Finally, the numeric results are compared with the experimental results from a vibration table testing, which shows great consistencies
CINFormer: Transformer network with multi-stage CNN feature injection for surface defect segmentation
Surface defect inspection is of great importance for industrial manufacture
and production. Though defect inspection methods based on deep learning have
made significant progress, there are still some challenges for these methods,
such as indistinguishable weak defects and defect-like interference in the
background. To address these issues, we propose a transformer network with
multi-stage CNN (Convolutional Neural Network) feature injection for surface
defect segmentation, which is a UNet-like structure named CINFormer. CINFormer
presents a simple yet effective feature integration mechanism that injects the
multi-level CNN features of the input image into different stages of the
transformer network in the encoder. This can maintain the merit of CNN
capturing detailed features and that of transformer depressing noises in the
background, which facilitates accurate defect detection. In addition, CINFormer
presents a Top-K self-attention module to focus on tokens with more important
information about the defects, so as to further reduce the impact of the
redundant background. Extensive experiments conducted on the surface defect
datasets DAGM 2007, Magnetic tile, and NEU show that the proposed CINFormer
achieves state-of-the-art performance in defect detection
Long-term postoperative quality of life in childhood survivors with cerebellar mutism syndrome
BackgroundTo investigate the long-term quality of life (QoL) of children with cerebellar mutism syndrome (CMS) and explore the risk factors for a low QoL.ProcedureThis cross-sectional study investigated children who underwent posterior fossa surgery using an online Pediatric Quality of Life Inventory questionnaire. CMS and non-CMS patients were included to identify QoL predictors.ResultsSixty-nine patients were included (male, 62.3%), 22 of whom had CMS. The mean follow-up time was 45.2 months. Children with CMS had a significantly lower mean QoL score (65.3 vs. 83.7, p < 0.001) and subdomain mean scores (physical; 57.8 vs. 85.3, p < 0.001; social: 69.5 vs. 85.1, p = 0.001; academic: p = 0.001) than those without CMS, except for the emotional domain (78.0 vs. 83.7, p = 0.062). Multivariable analysis revealed that CMS (coefficient = −14.748.61, p = 0.043), chemotherapy (coefficient = −7.629.82, p = 0.013), ventriculoperitoneal (VP) shunt placement (coefficient = −10.14, p = 0.024), and older age at surgery (coefficient = −1.1830, p = 0.007) were independent predictors of low total QoL scores. Physical scores were independently associated with CMS (coefficient = −27.4815.31, p = 0.005), VP shunt placement (coefficient = −12.86, p = 0.025), and radiotherapy (coefficient = −13.62, p = 0.007). Emotional score was negatively associated with age at surgery (coefficient = −1.92, p = 0.0337) and chemotherapy (coefficient = −9.11, p = 0.003). Social scores were negatively associated with male sex (coefficient = −13.68, p = 0.001) and VP shunt placement (coefficient = −1.36, p = 0.005), whereas academic scores were negatively correlated with chemotherapy (coefficient = −17.45, p < 0.001) and age at surgery (coefficient = −1.92, p = 0.002). Extent of resection (coefficient = 13.16, p = 0.021) was a good predictor of higher academic scores.ConclusionCMS results in long-term neurological and neuropsychological deficits, negatively affecting QoL, and warranting early rehabilitation
CD8(+) T Cells Involved in Metabolic Inflammation in Visceral Adipose Tissue and Liver of Transgenic Pigs
Anti-inflammatory therapies have the potential to become an effective treatment for obesity-related diseases. However, the huge gap of immune system between human and rodent leads to limitations of drug discovery. This work aims at constructing a transgenic pig model with higher risk of metabolic diseases and outlining the immune responses at the early stage of metaflammation by transcriptomic strategy. We used CRISPR/Cas9 techniques to targeted knock-in three humanized disease risk genes, GIPR(dn) , hIAPP and PNPLA3(I148M) . Transgenic effect increased the risk of metabolic disorders. Triple-transgenic pigs with short-term diet intervention showed early symptoms of type 2 diabetes, including glucose intolerance, pancreatic lipid infiltration, islet hypertrophy, hepatic lobular inflammation and adipose tissue inflammation. Molecular pathways related to CD8(+) T cell function were significantly activated in the liver and visceral adipose samples from triple-transgenic pigs, including antigen processing and presentation, T-cell receptor signaling, co-stimulation, cytotoxicity, and cytokine and chemokine secretion. The similar pro-inflammatory signaling in liver and visceral adipose tissue indicated that there might be a potential immune crosstalk between the two tissues. Moreover, genes that functionally related to liver antioxidant activity, mitochondrial function and extracellular matrix showed distinct expression between the two groups, indicating metabolic stress in transgenic pigs' liver samples. We confirmed that triple-transgenic pigs had high coincidence with human metabolic diseases, especially in the scope of inflammatory signaling at early stage metaflammation. Taken together, this study provides a valuable large animal model for the clinical study of metaflammation and metabolic diseases.Peer reviewe
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