5 research outputs found
Research on Key Technologies of Infrastructure Digitalization based on Multimodal Spatial Data
Since NASA put forward the concept of the digital twin in 2010, many
industries have put forward the dynamic goal of digital development, and the
transportation industry is also among them. With more and more companies laying
out on this virgin land, the digital twin transportation industry has grown
rapidly and gradually formed a complete scientific research system. However,
under the largely mature framework, there are still many loophole problems that
need to be solved. In the process of constructing a road network with point
cloud information, we summarize several major features of the point cloud
collected by laser scanners and analyze the potential problems of constructing
the network, such as misjudging the feature points as ground points and grid
voids. On this basis, we reviewed relevant literature and proposed targeted
solutions, such as building a point cloud pyramid modeled after the image
pyramid, expanding the virtual grid, etc., applying CSF for ground-point cloud
extraction, and constructing a road network model using the PTD (progressive
density-based filter) algorithm. For the problem of road sign detection, we
optimize the remote sensing data in the ground point cloud by enhancing the
information density using edge detection, improving the data quality by
removing the low intensity points, and achieving 90% accuracy of road text
recognition using PaddleOCR and Densenet. As for the real-time digital twin
traffic, we design the P2PRN network using the backbone of MPR-GAN for 2D
feature generation and SuperGlue for 2D feature matching, rendering the
viewpoints according to the matching optimization points, completing the
multimodal matching task after several iterations, and successfully calculating
the road camera position with 10{\deg} and 15m accuracy.Comment: 20 pages, in Chinese language, 12 figure
ClickINC: In-network Computing as a Service in Heterogeneous Programmable Data-center Networks
In-Network Computing (INC) has found many applications for performance boosts
or cost reduction. However, given heterogeneous devices, diverse applications,
and multi-path network typologies, it is cumbersome and error-prone for
application developers to effectively utilize the available network resources
and gain predictable benefits without impeding normal network functions.
Previous work is oriented to network operators more than application
developers. We develop ClickINC to streamline the INC programming and
deployment using a unified and automated workflow. ClickINC provides INC
developers a modular programming abstractions, without concerning to the states
of the devices and the network topology. We describe the ClickINC framework,
model, language, workflow, and corresponding algorithms. Experiments on both an
emulator and a prototype system demonstrate its feasibility and benefits
RR-LADP: A Privacy-Enhanced Federated Learning Scheme for Internet of Everything
While the widespread use of ubiquitously connected devices in Internet of Everything (IoE) offers enormous benefits, it also raises serious privacy concerns. Federated learning, as one of the promising solutions to alleviate such problems, is considered as capable of performing data training without exposing raw data that kept by multiple devices. However, either malicious attackers or untrusted servers can deduce users' privacy from the local updates of each device. Previous studies mainly focus on privacy-preserving approaches inside the servers, which require the framework to be built on trusted servers. In this article, we propose a privacy-enhanced federated learning scheme for IoE. Two mechanisms are adopted in our approach, namely the randomized response (RR) mechanism and the local adaptive differential privacy (LADP) mechanism. RR is adopted to prevent the server from knowing whose updates are collected in each round. LADP enables devices to add noise adaptively to its local updates before submitting them to the server. Experiments demonstrate the feasibility and effectiveness of our approach
Multi-omics analyses reveal bacteria and catalase associated with keloid diseaseResearch in context
Summary: Background: The pathology of keloid and especially the roles of bacteria on it were not well understood. Methods: In this study, multi-omics analyses including microbiome, metaproteomics, metabolomic, single-cell transcriptome and cell-derived xenograft (CDX) mice model were used to explore the roles of bacteria on keloid disease. Findings: We found that the types of bacteria are significantly different between keloid and healthy skin. The 16S rRNA sequencing and metaproteomics showed that more catalase (CAT) negative bacteria, Clostridium and Roseburia existed in keloid compared with the adjacent healthy skin. In addition, protein mass spectrometry shows that CAT is one of the differentially expressed proteins (DEPs). Overexpression of CAT inhibited the proliferation, migration and invasion of keloid fibroblasts, and these characteristics were opposite when CAT was knocked down. Furthermore, the CDX model showed that Clostridium butyricum promote the growth of patient's keloid fibroblasts in BALB/c female nude mice, while CAT positive bacteria Bacillus subtilis inhibited it. Single-cell RNA sequencing verified that oxidative stress was up-regulated and CAT was down-regulated in mesenchymal-like fibroblasts of keloid. Interpretation: In conclusion, our findings suggest that bacteria and CAT contribute to keloid disease. Funding: A full list of funding bodies that contributed to this study can be found in the Acknowledgements section