5,667 research outputs found
Deep Dimension Reduction for Supervised Representation Learning
The success of deep supervised learning depends on its automatic data
representation abilities. Among all the characteristics of an ideal
representation for high-dimensional complex data, information preservation, low
dimensionality and disentanglement are the most essential ones. In this work,
we propose a deep dimension reduction (DDR) approach to achieving a good data
representation with these characteristics for supervised learning. At the
population level, we formulate the ideal representation learning task as
finding a nonlinear dimension reduction map that minimizes the sum of losses
characterizing conditional independence and disentanglement. We estimate the
target map at the sample level nonparametrically with deep neural networks. We
derive a bound on the excess risk of the deep nonparametric estimator. The
proposed method is validated via comprehensive numerical experiments and real
data analysis in the context of regression and classification
SQLdepth: Generalizable Self-Supervised Fine-Structured Monocular Depth Estimation
Recently, self-supervised monocular depth estimation has gained popularity
with numerous applications in autonomous driving and robotics. However,
existing solutions primarily seek to estimate depth from immediate visual
features, and struggle to recover fine-grained scene details with limited
generalization. In this paper, we introduce SQLdepth, a novel approach that can
effectively learn fine-grained scene structures from motion. In SQLdepth, we
propose a novel Self Query Layer (SQL) to build a self-cost volume and infer
depth from it, rather than inferring depth from feature maps. The self-cost
volume implicitly captures the intrinsic geometry of the scene within a single
frame. Each individual slice of the volume signifies the relative distances
between points and objects within a latent space. Ultimately, this volume is
compressed to the depth map via a novel decoding approach. Experimental results
on KITTI and Cityscapes show that our method attains remarkable
state-of-the-art performance (AbsRel = on KITTI, on KITTI with
improved ground-truth and on Cityscapes), achieves , and
error reduction from the previous best. In addition, our approach
showcases reduced training complexity, computational efficiency, improved
generalization, and the ability to recover fine-grained scene details.
Moreover, the self-supervised pre-trained and metric fine-tuned SQLdepth can
surpass existing supervised methods by significant margins (AbsRel = ,
error reduction). self-matching-oriented relative distance querying in
SQL improves the robustness and zero-shot generalization capability of
SQLdepth. Code and the pre-trained weights will be publicly available. Code is
available at
\href{https://github.com/hisfog/SQLdepth-Impl}{https://github.com/hisfog/SQLdepth-Impl}.Comment: 14 pages, 9 figure
PERFORMANCE COMPARISON OF SYNGAS METHANATION ON FLUIDIZED AND FIXED BED REACTORS
The performance was compared on Syngas Completely Methanation at atmospheric pressure on fluidized and fixed bed reactors. From space-time yield of CH4, coke content and hot spots of bed temperature, fluidized bed technology was demonstrated to be more applicable to Syngas Completely Methanation. Characterization results showed that different carbon deposition forms were presented on the two operation modes
Spectral Efficiency Analysis of Uplink-Downlink Decoupled Access in C-V2X Networks
The uplink (UL)/downlink (DL) decoupled access has been emerging as a novel
access architecture to improve the performance gains in cellular networks. In
this paper, we investigate the UL/DL decoupled access performance in cellular
vehicle-to-everything (C-V2X). We propose a unified analytical framework for
the UL/DL decoupled access in C-V2X from the perspective of spectral efficiency
(SE). By modeling the UL/DL decoupled access C-V2X as a Cox process and
leveraging the stochastic geometry, we obtain the joint association
probability, the UL/DL distance distributions to serving base stations and the
SE for the UL/DL decoupled access in C-V2X networks with different association
cases. We conduct extensive Monte Carlo simulations to verify the accuracy of
the proposed unified analytical framework, and the results show a better system
average SE of UL/DL decoupled access in C-V2X.Comment: 6pagaes,5 figures, globecom 202
Research on Remediation of Petroleum Contaminated Soil by Plant-Inoculation Cold-Adapt Bacteria
Protection effect of sanguinarine on whole-body exposure of X radiation in BALB/c mice
To investigate the effects of sanguinarine (SAN) on acute radiation induced injury in mice, 45 mice were randomly divided into control, 10 Gy and SAN+10 Gy groups. Mice in the 10 Gy and SAN+10 Gy groups were exposed to single X-ray radiation with an accumulated dose of 10 Gy. Mice in the SAN+10 Gy group were administered intraperitoneally with 2.5 mg/kg body weight of SAN before radiation. Five days after radiation exposure, 5 mice from each group were sacrificed and samples of the small intestine, lung, spleen and liver were fixed for histopathological examinations. Compared with the 10 Gy group, radiation sickness was obviously delayed or attenuated in the SAN+10 Gy group. Survival analysis showed a significant difference between 2 radiation groups (PPara investigar os efeitos da sanguinarina (SAN) em lesões induzidas em ratos por radiação aguda, 45 ratos foram aleatoriamente divididos em grupo controle, grupo 10 Gy e grupo SAN+10 Gy. Os ratos dos grupos 10 Gy e SAN+10 Gy foram expostos à radiação de raio-X simples com uma dose acumulada de 10 Gy. Aos ratos do grupo SAN+10 Gy administraram-se, intraperitonealmente, 2.5 mg/kg de peso de SAN antes da radiação. Aos 5 dias de exposição à radiação, sacrificaram-se 5 ratos de cada grupo e retiraram-se amostras do intestino delgado, pulmões, baço e fígado para exames histopatológicos. Comparando com o grupo 10 Gy, a doença por radiação foi claramente atrasada e atenuada no grupo SAN+10 Gy. A análise de sobrevivência mostrou diferença significativa entre os dois grupos de radiação (
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