检索结果-南通市图书馆

Study on An Absolute Non-Collision Hash and Jumping Table IP Classification Algorithms

在线全文

学校读者我要写书评

暂无评论

Wuhan university Journal of Natural Sciences 2004年第5期9卷 835-838页

作者： SHANG Feng-jun 1,2 ,PAN Ying-jun 1 1. Key Laboratory of Opto-Electronic Technology and System of Ministry of Education/college of Opto-Electronic Engineering,Chongqing university, Chongqing 400044,china 2. college of computer Science and Technology, Chongqing university of posts and telecommunications, Chongqing 400065,china Chongqing university Key Laboratory of Opto-Electronic Technology and System of Ministry of Education/College of Opto-Electronic Engineering Chongqing China (GRID:grid.190737.b) (ISNI:***) Chongqing university of posts and telecommunications College of Computer Science and Technology Chongqing China (GRID:grid.411587.e) (ISNI:***) Chongqing university Key Laboratory of Opto-Electronic Technology and System of Ministry of Education/College of Opto-Electronic Engineering Chongqing China (GRID:grid.190737.b) (ISNI:***)

In order to classify packet, we propose a novel IP classification based the non-collision hash and jumping table trie-tree (NHJTTT) algorithm, which is based on noncollision hash Trie-tree and Lakshman and Stiliadis proposing a 2-dimensional classification algorithm (LS algorithm). The core of algorithm consists of two parts: structure the non-collision hash function, which is constructed mainly based on destination/source port and protocol type field so that the hash function can avoid space explosion problem; introduce jumping table Trie-tree based LS algorithm in order to reduce time complexity. The test results show that the classification rate of NHJTTT algorithm is up to 1 million packets per second and the maximum memory consumed is 9 MB for 10 000 rules. Key words IP classification - lookup algorithm - trie-tree - non-collision hash - jumping table CLC number TN 393.06 Foundation item: Supported by the Chongqing of posts and telecommunications Younger Teacher Fundation (A2003-03).Biography: SHANG Feng-jun (1972-), male, Ph.D. candidate, lecture, research direction: the smart instrument and network.

关键词： IP classification lookup algorithm trie-tree non-collision hash jumping table

Scenarios analysis and performance assessment of blockchain integrated in 6G scenarios

在线全文

学校读者我要写书评

暂无评论

Science china(Information Sciences) 2024年第7期67卷 5-26页

作者： Bo LI Guanjie CHENG Honghao GAO Xueqiang YAN Shuiguang deng college of computer Science and Technology Zhejiang University college of computer Science and Technology Shanghai University 2012 Lab Huawei Technologies Co. Ltd.

Emerging applications such as smart city infrastructures and virtual reality landscapes are setting rigorous benchmarks for 6G mobile networks, requiring elevated levels of confidentiality, integrity, nonrepudiation, authentication, and stringent access controls. Blockchain technology is heralded as a transformative enabler for meeting 6G standards, owing to its intrinsic attributes. However, a gap exists in the holistic investigation of blockchain's applicability in 6G realms, particularly addressing the “whether”, “when”, and“how” of its deployment. Present research trails in developing robust methodologies to gauge blockchain's efficacy within 6G use cases. Addressing this, our study introduces a novel confluence of blockchain with 6G networks, where data resides in distributed Hash tables(DHTs) while their hashes are secured in distributed ledger technology(DLT), harnessing blockchain's core strengths-immutability, traceability, and fortified security. We delineate seven specific 6G use cases poised for enhancement through blockchain integration,and scrutinize the rationale, nature, and timing of this convergence. Furthermore, we devise a comprehensive methodology for assessing blockchain's performance metrics and scalability in 6G environments. Our extensive experimental analyses evaluate the synergistic performance of this integration, revealing that the Quorum blockchain satisfactorily supports 80% of 6G scenarios. The findings suggest that, with appropriate configurations, consortium blockchains are well-equipped to fulfill the demanding performance and scalability requisites of 6G networks.

关键词： blockchain distributed ledger technology (DLT) 6G performance assessment 6G scenarios analysis transaction arrival rate

Energy-efficient computation offloading assisted by RIS-based UAV

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

The Journal of china Universities of posts and telecommunications 2024年第1期31卷 37-48页

作者： Li Linpei Zhao chuan Su Yu Huo Jiahao Huang Yao Li Haojin School of Intelligence Science and Technology University of Science and Technology BeijingBeijing 100083China Institute of Artificial Intelligence University of Science and Technology BeijingBeijing 100083China Shunde Innovation School University of Science and Technology BeijingFoshan 528399China School of computer and Communication Engineering University of Science and Technology BeijingBeijing 100083China Research Department of 5G and Drone China Mobile(Chengdu)Institute of Research and DevelopmentChengdu 610200China college of Communication Engineering Chengdu University of Information TechnologyChengdu 610225China Research and Development Center Sony(China)LimitedBeijing 100027China

The new applications surge with the rapid evolution of the mobile *** explosive growth of the data traffic aroused by the new applications has posed great computing pressure on the local *** is essential to innovate the computation offloading methods to alleviate the local computing burden and improve the offloading *** edge computing(MEC)assisted by reflecting intelligent surfaces(RIS)-based unmanned aerial vehicle(UAV)is a promising method to assist the users in executing the computation tasks in proximity at low *** this paper,we propose an energy-efficient MEC system assisted by RIS-based UAV,where the UAV with RIS mounted relays the computation tasks to the MEC *** energy efficiency maximization problem is formulated by jointly optimizing the UAV's trajectory,the transmission power of all users,and the phase shifts of the reflecting elements placed on the *** that the optimization problem is non-convex,we propose a deep deterministic policy gradient(DDPG)-based *** combining the DDPG algorithm with the energy efficiency maximization problem,the optimization problem can be ***,the numerical results are illustrated to show the performance of the system and the superiority compared with the benchmark schemes.

关键词： mobile edge computing unmanned aerial vehicle reflecting intelligent surface

Outage Probability of Transmitter Antenna Selection/Receiver-MRC over Spatially Correlated Nakaga mi-Fading Channel

在线全文

学校读者我要写书评

暂无评论

Outage Probability of Transmitter Antenna Selection/Receiver...

BAR:a branch-alternation-resorting algorithm for locality exploration in graph processing

第八届国际信号处理国际会议

作者： Bao-Yun wang and Wei Xing Zheng college of Communication and Information Engineering nanjing university of posts and telecommunications nanjing 210003 china School of Computing and Mathematics university of Western Sydney Penrith South DC NSW 1797 Australia

＜正＞The deployment of multiple antennas at the receiver or transmitter will increase the complexity and thus the cost of the communication systems. To design an MIMO system with a reasonable complexity is a challenging task. Antenna selection is a very attractive technique in this field. In this paper, we investigate the outage performance of the transmitter antenna selection/ receiver MRC scheme over correlated Nakagami-fading channels. We utilize the characteristics function method to derive outage probability. computer simulation study is conducted to evaluate the derived expression.

关键词：

来源： cnki会议评论

在线全文

cnki会议

学校读者我要写书评

暂无评论

High Technology Letters 2024年第1期30卷 31-42页

作者：邓军勇 wang Junjie JIANG Lin XIE Xiaoyan ZHOU Kai School of Electronic Engineering Xi'an University of Posts and TelecommunicationsXi'an 710121P.R.China School of computer Xi'an University of Science and TechnologyXi'an 710054P.R.China School of computer Xi'an University of Posts and TelecommunicationsXi'an 710121P.R.China

Unstructured and irregular graph data causes strong randomness and poor locality of data accesses in graph *** paper optimizes the depth-branch-resorting algorithm(DBR),and proposes a branch-alternation-resorting algorithm(BAR).In order to make the algorithm run in parallel and improve the efficiency of algorithm operation,the BAR algorithm is mapped onto the reconfigurable array processor(APR-16)to achieve vertex reordering,effectively improving the locality of graph *** paper validates the BAR algorithm on the GraphBIG framework,by utilizing the reordered dataset with BAR on breadth-first search(BFS),single source shortest paht(SSSP)and betweenness centrality(BC)algorithms for *** results show that compared with DBR and Corder algorithms,BAR can reduce execution time by up to 33.00%,and 51.00%*** terms of data movement,the BAR algorithm has a maximum reduction of 39.00%compared with the DBR algorithm and 29.66%compared with Corder *** terms of computational complexity,the BAR algorithm has a maximum reduction of 32.56%compared with DBR algorithm and53.05%compared with Corder algorithm.

关键词： graph processing vertex reordering branch-alternation-resorting algorithm(BAR) reconfigurable array processor

Distributed reduction algorithm on grid service

在线全文

学校读者我要写书评

暂无评论

The Journal of china Universities of posts and telecommunications 2010年第2期17卷 122-126页

作者： deng Song wang ru-chuan FU Xiong college of computer Nanjing University of Posts and Telecommunications Nanjing 210003 China

Pretreatment of mass and high dimensional data for users plays an important role for data mining in grid environment. To solve optimal reduction effectively, a distributed reduction algorithm on grid service is present. It combines grid services with a novel reduction algorithm on gene expression programming （GEP）（RA-GEP）. Simulation experiments show that for mass or high dimensional data sets, the proposed algorithm has advantages in terms of speed and quality in contrast with traditional attribution reduction algorithms on intelligence computing.

关键词： gene expression programming distributed reduction grid service intelligence computing

在线全文

学校读者我要写书评

暂无评论

基于会话的局域网P2P流量识别方法的研究

计算机技术与发展 2010年第3期20卷 5-8页

作者：宫博王汝传南京邮电大学计算机学院江苏南京210003

随着P2P技术的发展,很多P2P软件采用了新的技术改善局域网用户的传输质量,导致P2P数据传输中出现了新的特征。针对STUN协议,在多元分类的基础上,提出了一种基于会话的P2P流量识别算法。首先介绍了STUN协议建立会话的消息格式,并描述了... 详细信息

随着P2P技术的发展,很多P2P软件采用了新的技术改善局域网用户的传输质量,导致P2P数据传输中出现了新的特征。针对STUN协议,在多元分类的基础上,提出了一种基于会话的P2P流量识别算法。首先介绍了STUN协议建立会话的消息格式,并描述了几种不同类型NAT建立地址映射的过程。算法采用多元组描述会话,建立二叉树结构对收发的数据包依次进行分析,识别P2P会话,最后以哈希表存储会话状态。在Linux环境下,以迅雷为例进行实验,结果表明采用本算法可以很好地识别P2P数据流。

关键词：识别 P2P 会话 NAT STUN

Achieving high power factor in GaSb with intrinsically high mobility via Ge doping

在线全文

学校读者我要写书评

暂无评论

Rare Metals 2024年第10期43卷 5435-5441页

作者： Yan-Ci Yan Guo-Wei wang Qi-Hong Xiong Xu Lu Peng Chen Wei Zou deng-Feng Li Hong Wu Yun Zhou Xiao-Yuan Zhou School of Science Chongqing University of Posts and Telecommunications college of Physics Chongqing University college of Ocean Science and Engineering Shanghai Maritime University

The thermoelectric power factor is as crucial as their overall thermoelectric ***-based compounds are deemed to achieve high power factor owing to their intrinsically high mobility compared to classical thermoelectric ***,the carrier concentration of pristine GaSb is considerably lower than the optimum value,which hinders its ability to attain high electrical *** this paper,we present the investigations on the thermoelectric performance of p-type *** experimental results reveal that Ge doping can effectively tune the carrier concentration.

关键词： Carrier concentration

基于C8051F020的PWM输出频率分析

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

数据采集与处理 2009年第B10期24卷 229-232页

作者：黄慧张庆武殷兴辉河海大学计算机及信息工程学院南京210098 南京邮电大学通信与信息工程学院南京210003

基于C8051F020芯片,研究了PCA模块的PWM信号产生原理以及软件实现的方法,并通过实验方法针对PCA模块,提出了PWM输出频率与PCA计数器/定时器时基的关系公式,结合计算与实验观察,分析了在不同设定下输出波形的频率范围以及频率与占空比的... 详细信息

基于C8051F020芯片,研究了PCA模块的PWM信号产生原理以及软件实现的方法,并通过实验方法针对PCA模块,提出了PWM输出频率与PCA计数器/定时器时基的关系公式,结合计算与实验观察,分析了在不同设定下输出波形的频率范围以及频率与占空比的准确性问题。实验结果表明,基于C8051F020产生的PWM信号具有控制精度高,响应快的优点,适于日常生活、工业生产和科学研究领域对控制系统的需要。

关键词： C8051F020单片机 PWM 可编程计数阵列