检索结果-南通市图书馆

Task Offloading Strategy with Emergency Handling and Blockchain Security in SDN-Empowered and Fog-Assisted Healthcare IoT

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Tsinghua Science and Technology 2022年第4期27卷 760-776页

作者： Junyu Ren Jinze Li Huaxing Liu tuanfa qin School of Electronic and Information Engineering South China University of TechnologyGuangzhou 510640China Guangxi University Xingjian College of Science and Liberal Arts Nanning 530004China Guangxi Key Laboratory of Multimedia Communications and Network Technology Guangxi UniversityNanning 530004China Guangxi Key Laboratory of Multimedia Communications and Network Technology School of ComputerElectronics and InformationGuangxi UniversityNanning 530004China Faculty of Earth Sciences&Geography Trinity CollegeUniversity of CambridgeCambridgeCB21TNUK

With the rapid advancement of the Internet of Things(IoT),the typical application of wireless body area networks(WBANs)based smart healthcare has drawn wide attention from all sectors of *** alleviate the pressing challenges,such as resource limitations,low-latency service provision,mass data processing,rigid security demands,and the lack of a central entity,the advanced solutions of fog computing,software-defined networking(SDN)and blockchain are leveraged in this *** the basis of these solutions,a task offloading strategy with a centralized low-latency,secure and reliable decision-making algorithm having powerful emergency handling capacity(LSRDM-EH)is designed to facilitate the resource-constrained edge devices for task ***,to well ensure the security of the entire network,a comprehensive blockchain-based two-layer and multidimensional security strategy is ***,to tackle the inherent time-inefficiency problem of blockchain,we propose a blockchain sharding scheme to reduce system time *** simulation has been conducted to validate the performance of the proposed measures,and numerical results verify the superiority of our methods with lower time-latency,higher reliability and security.

关键词： wireless body area networks(WBANs) healthcare IoT software-defined networking(SDN) fog computing blockchain task offloading blockchain sharding

An Energy-saving Algorithm for Wireless Sensor Networks E3ased on Network Coding and Compressed Sensing

在线全文

学校读者我要写书评

暂无评论

China Communications 2014年第A1期11卷 171-178页

作者： qin tuanfa SchoolofComputerandElectronicInformation GuangxiUniversityNanning530004China GuangxiKeyLaboratoryofMultimediaCommunicationsandNetworkTechnology GuangxiUniversityNanning530004China InformationSecurityCenter BeijingUniversityofPostsandTelecommunicationsBeijing100876China NationalEngineeringLaboratoryforDisasterBackupandRecovery Beijing100876China

An energy-saving algorithm for wireless sensor networks based on network coding and compressed sensing （CS-NCES） is proposed in this paper. Along with considering the correlations of data spatial and temporal, the algorithm utilizes the similarities between the encoding matrix of network coding and the measurement matrix of compressed sensing. The source node firstly encodes the data, then compresses the coding data by cot-npressed sensing over finite fields. Compared with the network coding scheme, simulation results show that CS-NCES reduces the energy consumption about 25.30/0-34.50/0 and improves the efficiency of data reconstruction about 1.56%- 5.98%. The proposed algorithm can not only enhance the usability of network coding in wireless sensor networks, but also improve the network performance.

关键词： wireless sensor networks network coding compressed sensing deterministic matrix network energy-efficiency.

Two-Stage Constructions for the Rate-Compatible Shortened Polar Codes

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Tsinghua Science and Technology 2023年第2期28卷 269-282页

作者： Chunjie Li Haiqiang Chen Zelin Wang Youming Sun Xiangcheng Li tuanfa qin School of Computer Electronics and Information and Guangxi Colleges and Universities Key Laboratory of Multimedia Communications and Information ProcessingGuangxi UniversityNanning 530004China Key Laboratory of Disaster Prevention and Structural Safety of Ministry of Education Guangxi UniversityNanning 530004China

In this paper,we propose the two-stage constructions for the rate-compatible shortened polar(RCSP)*** the Stage-I construction,the shortening pattern and the frozen bit are jointly designed to make the shortened bits be completely known by the ***,a distance-greedy algorithm is presented to improve the minimum Hamming distance of the *** design the remaining Stage-II frozen bits,three different construction algorithms are further presented,called the Reed-Muller(RM)construction,the Gaussian Approximation(GA)construction,and the RM-GA *** we give the row weight distribution numerical results of the generator matrix after the Stage-I and Stage-II constructions,which shows that the proposed constructions can efficiently increase the minimum Hamming *** results show that the proposed RCSP codes have excellent frame error rate(FER)performances at different code lengths and code *** specifically,the RM-GA construction performs best and can achieve at most 0.8 dB gain compared to the Wang14 and the quasi-uniform puncturing(QUP)*** RM construction is designed completely by the distance-constraint without channel evaluation thus has the simplest ***,it still has better FER performance than the existing shortening/puncturing schemes,especially at high signal noise ratio(SNR)region.

关键词： polar codes rate-compatibility Reed-Muller codes Hamming distance shortening

Blockchain-envisioned unmanned aerial vehicle communications in space-air-ground integrated network: A review

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Intelligent and Converged Networks 2021年第4期2卷 277-294页

作者： Zhonghao Wang Fulai Zhang Qiqi Yu tuanfa qin School of Computer and Electronic Information and the Guangxi Key Laboratory of Multimedia Communications and Network Technology Guangxi UniversityNanning 530004China

Unmanned Aerial Vehicle(UAV)communications have recently entered a new period of interest,motivated by technological advances and the gradual emergence of the Space-Air-Ground Integrated Network(SAGIN).The current survey aims to capture the use of UAVs in the SAGIN while highlighting the most promising open research *** traditional UAV network architecture is not adequate to meet the challenges presented by the SAGIN,and an effective and secure space-air-ground integrated UAV network needs to be *** its well-distributed management and consensus mechanism,blockchain technology can make up for the deficiency of the traditional UAV *** this work,we review the role of UAVs in the ***,three applications of the blockchain-envisioned UAV network are introduced through several *** challenges and the corresponding open research topics are also described.

关键词： Unmanned Aerial Vehicle(UAV) blockchain Space-Air-Ground Integrated Network(SAGIN) security Internet of Things(IoT)

Energy-saving PPM schemes for WSNs

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Science in China(Series F) 2008年第5期51卷 571-585页

作者： TANG QiuLing YANG Liuqing qin tuanfa ZHANG ShuYi School of Computer Electronics and Information Guangxi University Nanning 530004 China Department of Electrical and Computer Engineering University of Florida P. O. Box 116130 Gainesville FL 32611 USA Lab of Modern Acoustics Nanjing University Nanjing 210093 China

Energy conservation is a critical problem in recently-emerging wireless sensor networks （WSNs）. Pulse position modulation （PPM）, as an exploring-worthy modulation format for energy efficiency, is tailored for WSNs into two schemes, mono-mode PPM and multi-mode PPM, in this paper. Resorting to an idealized system model and a practical system model, which combine the power consumptions in transmission and reception modules of nodes with the idealized and real- istic battery characteristics, the battery energy efficiencies of mono-mode PPM and multi-mode PPM are evaluated and compared. To minimize the battery energy consumption （BEC）, these schemes are further optimized in terms of constellation size M for a link in path-loss channels. Our analytical and numerical results show that considerable energy can be saved by multi-mode PPM; and the optimization performances of these schemes are noticeable at various communication distances though their optimization properties are different.

关键词： wireless sensor networks (WSNs) mono-mode PPM multi-mode PPM battery energy consumption (BEC),parameter optimization

An Iterative Detection/Decoding Algorithm of Correlated Sources for the LDPC-Based Relay Systems

在线全文

学校读者我要写书评

暂无评论

China Communications 2017年第9期14卷 190-198页

作者： Haiqiang Chen Hang Cao Xiangcheng Li Youming Sun Haibin Wan tuanfa qin The School of Computer and Electronic Information Guangxi University Guangxi Key Laboratory of Multimedia Communications and Network Technology Guangxi University Guangxi Colleges and Universities Key Laboratory of Multimedia Communications and Information Processing Guangxi University

An iterative detection/decoding algorithm of correlated sources for the LDPC-based relay systems is presented. The signal from the source-destination(S-D) link is formulated as a highly correlated counterpart from the relay-destination(R-D) link. A special XOR vector is defined using the correlated hard decision information blocks from two decoders and the extrinsic information exchanged between the two decoders is derived by the log-likelihood ratio(LLR) associated with the XOR vector. Such the decoding scheme is different from the traditional turbo-like detection/decoding algorithm, where the extrinsic information is computed by the side information and the soft decoder outputs. Simulations show that the presented algorithm has a slightly better performance than the traditional turbo-like algorithm(Taking the(255,175) EG-LDPC code as an example, it achieves about 0.1 dB performance gains aroundBLER=10^(-4)). Furthermore, the presented algorithm requires fewer computing operations per iteration and has faster convergence rate. For example, the average iteration of the presented algorithm is 33 at SNR=1.8 dB, which is about twice faster than that of the turbo-like algorithm, when decoding the(961,721) QC-LDPC code. Therefore, the presented decoding algorithm of correlated sources provides an alternative decoding solution for the LDPC-based relay systems.

关键词： correlated sources iterative de-coding LDPC codes relay channel

在线全文

学校读者我要写书评

暂无评论

基于MPEG-7中主颜色提取的改进方法

计算机工程 2005年第16期31卷 185-187页

作者：王海霞覃团发广西大学计算机与电子信息学院南宁530004

针对实时性检索系统,结合MPEG-7标准的颜色评价准则,提出了一种基于MPEG-7中主颜色描述符提取的改进方法,实验结果表明改进效果明显。

关键词：图像检索 MPEG-7 主颜色改进方法

在线全文

学校读者我要写书评

暂无评论

基于多重假设的视频压缩感知分层重建

数据采集与处理 2013年第6期28卷 730-738页

作者：常侃覃团发唐振华广西大学计算机与电子信息学院南宁530004

为了改进视频压缩感知方案的性能,提出了一种基于多重假设的视频压缩感知分层重建方案。该重建方案以图像组为单位进行,首先对关键帧进行空域多重假设预测和残差重建;接下来对图像组中的每个非关键帧分配重建层级,并按照由低至高的顺序... 详细信息

为了改进视频压缩感知方案的性能,提出了一种基于多重假设的视频压缩感知分层重建方案。该重建方案以图像组为单位进行,首先对关键帧进行空域多重假设预测和残差重建;接下来对图像组中的每个非关键帧分配重建层级,并按照由低至高的顺序逐层重建;每个非关键帧的重建过程逐块进行,需要其参考帧中的时域假设预测集合及当前帧中的空域假设预测集合来对每个图像块做混合多重假设预测,并通过求解全变分最小化问题进行残差重建。实验结果表明,在相同采样率下,与已有的视频压缩感知方案相比,本文方案可以获得质量更高的重建图像。

关键词：压缩感知多重假设分层重建全变分最小化

在线全文

学校读者我要写书评

暂无评论

一种划分小区域的区块链频谱共享管理方法

西安电子科技大学学报 2020年第6期47卷 122-130页

作者：李金泽王中豪李孟恒覃团发广西大学计算机与电子信息学院广西壮族自治区南宁530004 广西多媒体通信与网络技术重点实验室广西壮族自治区南宁530004

针对传统无线接入网中频谱共享的系统架构容量低且易遭受攻击等问题,提出了一种基于小区域划分的区块链分布式频谱共享管理方法。采用区块链分布式账本存储技术,将完整数据保存在区块链节点中,保证用户交易数据的完整性与安全性;节点根... 详细信息

针对传统无线接入网中频谱共享的系统架构容量低且易遭受攻击等问题,提出了一种基于小区域划分的区块链分布式频谱共享管理方法。采用区块链分布式账本存储技术,将完整数据保存在区块链节点中,保证用户交易数据的完整性与安全性;节点根据功能进行分类,移动端用户仅作为轻量化节点,可降低其能耗与成本;将频谱资源提供者通过k均值算法自动划分到不同的区块链中,降低共识过程所带来的延迟。该方案将频谱资源提供者作为共识节点,移动端用户作为轻量化节点,对二者交易进行仿真。仿真结果表明,通过小区域划分方法增加了区块的确认次数,系统所有节点完成区块确认的平均时间为16 s;而未实施小区域划分的同类方案在保证系统安全性的前提下,最小次数的区块确认时间需36 s。这种方法在提高了系统安全性的同时,可大幅降低新区块确认过程的延迟。

关键词：频谱共享区块链 k均值算法区块链节点