检索结果-南通市图书馆

维普期刊数据库

Protecting User Privacy in a multi-path Information-Centric Network Using multiple Random-Caches

在线全文

学校读者我要写书评

暂无评论

Journal of Computer Science & Technology 2017年第3期32卷 585-598页

作者： Wei-Bo Chu Li-Fang Wang Ze-Jun Jiang Chin-Chen Chang School of Computer Science and Technology Northwestern Polytechnical University Xi'an 710072 China Department of Information Engineering and Computer Science Feng Chia University Taichung Taiwan 40724 China

In-network caching is a fundamental mechanism advocated by information-centric networks （ICNs） for efficient content delivery. However, this new mechanism also brings serious privacy risks due to cache snooping attacks. One effective solution to this problem is random-cache, where the cache in a router randomly mimics a cache hit or a cache miss for each content request/probe. In this paper, we investigate the effectiveness of using multiple random-caches to protect cache privacy in a multi-path ICN. We propose models for characterizing the privacy of multi-path ICNs with random-caches, and analyze two different attack scenarios： 1） prefix-based attacks and 2） suffix-based attacks. Both homogeneous and heterogeneous caches are considered. Our analysis shows that in a multi-path ICN an adversary can potentially gain more privacy information by adopting prefix-based attacks. Furthermore, heterogeneous caches provide much better privacy protection than homogeneous ones under both attacks. The effect of different parameters on the privacy of multi-path random-caches is further investigated, and the comparison with its single-path counterpart is carried out based on numerical evaluations. The analysis and results in this paper provide insights in designing and evaluating multi-path ICNs when we take privacy into consideration.

关键词： information-centric network (ICN) user privacy cache snooping random-cache multi-path

A new method to estimate DOA in CDMA system in multi-path environment

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Journal of Central South University of Technology 2006年第3期13卷 270-274页

作者：单志勇周希朗张琪 College of Information Science and Technology Donghua UniversityShanghai 200051 ChinaDepartment of Electronic Engineering Shanghai Jiaotong University Shanghai 200030China Department of Electronic Engineering Shanghai Jiaotong University Shanghai 200030China

An algorithm for direction angle of arrival(DOA) estimation and array calibration of signals from multiple mobile users in the CDMA systems and multi-path environment was presented . The main idea is that the algorithm employs code-matched filter and model of the inter-symbol interference and multiple-access interference exactly. The correlation matrices of the received signals before and after code-matched filtering were employed to eliminate the effect of the additive white Gaussian noise, and a new mathematical problem was created, a new maximum likelihood method based on the strong law of large number was derived for DOA estimation and array calibration. Computer simulation results prove that the algorithm is effective.

关键词： DOA CDMA multi-path code-matched filter

维普期刊数据库

multi-access performance of DS UWB systemunder indoor dense multi-path channel

在线全文

学校读者我要写书评

暂无评论

Journal of Southeast University(English Edition) 2005年第4期21卷 393-397页

作者：樊祥宁倪剑强毕光国东南大学移动通信国家重点实验室南京210096

The performance of multi-user code to direct spreading bi-phase shift keying （DS-BPSK） direct impulse ultra wideband （UWB） systems under indoor multi-user and multi-path environment is analyzed and simulated. The system output signals with Rake receiver are derived, then a simple and practical code selection scheme is given; i. e., with a large occupation to empty ratio of the repeating pulses, directly choosing those random or pseudo-random user codes with enough length and good co-relative orthogonal features will make the performance of DS-BPSK approximate the optimum and, so there is no need to carefully design the code or its type. The system multi-access performances are simulated using Gold sequence and PN codes as multi-user codes under CMI-CM4 multi-path channels. Simulation results prove that the proposed scheme is feasible.

关键词： ultra wideband multi-access multi-path Gold code direct sequence Rake

维普期刊数据库

MRBCH: A multi-path Routing Protocol Based on Credible Cluster Heads for Wireless Sensor Networks

在线全文

学校读者我要写书评

暂无评论

International Journal of Communications, Network and System Sciences 2010年第8期3卷 689-696页

作者： Yang Yang Enjian Bai Jia Hu Wenqiang Wu 不详

Wireless sensor networks are widely used for its flexibility, but they also suffer from problems like limited capacity, large node number and vulnerability to security threats. In this paper, we propose a multi-path routing protocol based on the credible cluster heads. The protocol chooses nodes with more energy remained as cluster heads at the cluster head choosing phase, and then authenticates them by the neighbor cluster heads. Using trust mechanisms it creates the credit value, and based on the credit value the multi-path cluster head routing can finally be found. The credit value is created and exchanged among the cluster heads only. Theoretical analysis combined with simulation results demonstrate that this protocol can save the resource, prolong the lifetime, and ensure the security and performance of the network.

关键词： Wireless Sensor Network Clustering multi-path Routing Credit Value

QoS Based and Energy Aware multi-path Hierarchical Routing Algorithm in 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

Wireless Sensor Network 2012年第2期4卷 31-39页

作者： Mohammad Reza Mazaheri Behzad Homayounfar Sayyed Majid Mazinani Department of Technical and Engineering Mashhad Branch Islamic Azad University Mashhad Iran

In hierarchical networks, nodes are separated to play different roles such as CHs and cluster members. Each CH collects data from the cluster members within its cluster, aggregates the data and then transmits the data to the sink. Each algorithm that is used for packet routing in quality of service (QoS) based applications should be able to establish a tradeoffs between end to end delay parameter and energy consumption. Therefore, enabling QoS applications in sensor networks requires energy and QoS awareness in different layers of the protocol stack. We propose a QoS based and Energy aware multi-path Hierarchical Routing Algorithm in wireless sensor networks namely QEMH. In this protocol, we try to satisfy the QoS requirements with the minimum energy via hierarchical methods. Our routing protocol includes two phase. In first phase, performs cluster heads election based on two parameters: node residual energy and node distance to sink. In second phase, accomplishes routes discovery using multiple criteria such as residual energy, remaining buffer size, signal-to-noise ratio and distance to sink. When each node detect an event can send data to the CH as single hop and CH to the sink along the paths. We use a weighted traffic allocation strategy to distribute the traffic amongst the available paths to improve the end to end delay and throughput. In this strategy, the CH distributes the traffic between the paths according to the end to end delay of each path. The end to end delay of each path is obtained during the paths discovery phase. QEMH maximizes the network lifetime as load balancing that causes energy consume uniformly throughout the network. Furthermore employs a queuing model to handle both real-time and non-real-time traffic. By means of simulations, we evaluate and compare the performance of our routing protocol with the MCMP and EAP protocols. Simulation results show that our proposed protocol is more efficient than those protocols in providing QoS requirem

关键词： Clustering Lifetime multi-path Qos Requirement Energy Consumption Hierarchical Networks

Performance Study of multi-path in VANETs and Their Impact on Routing Protocols

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Wireless Engineering and Technology 2011年第3期2卷 125-129页

作者： Jing Wu Yuhao Wang 不详

Modeling complicated vehicular traffic behavior and analyzing effects on the communication performance of routing protocols taken by environmental factors have been a challenging task for the past several years. In this paper, we study the performance of multi-path routing protocol. Then, we investigate both multi-path and single-path routing protocol and analyze characteristics such as network connectivity, vehicle-node density etc. To better understand this phenomenon, we use mobility model with different parameters and evaluate the performance of routing protocols (Ad-hoc On-Demand Distance Vector and Ad-hoc On-demand multipath Distance Vector routing protocols) through NS2 platform. The simulation results show the significance of multi-path on the throughput, loss and average delay of VANETs. The results of this paper may be used to study designing route protocols and applications of VANET.

关键词： Vehicular Ad Hoc Networks(VANETs) multi-path AODV AOMDV

A Distributed Parallel QoS Routing Algorithm with multi-path Probing

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

A Distributed Parallel QoS Routing Algorithm with Multi-path...

A Location-Based multi-path Routing Approach in Ad Hoc Networks

2009中国控制与决策会议

作者： Zhuo Guo~1,Jianzhong Qiao~(1,2),Shukuan Lin~1 and Xueliang Cai~1 1.College of Information Science and Engineering,Northeastern University,Liaoning Province 110004,China 2.Key Laboratory of Software System Application and Development Generic Technology,Liaoning Province,110004,China

＜正＞The task of Quality-of-Service（QoS） routing is to find a path in the network that satisfies certain constraints on metrics such as bandwidth,delay,delay jitter and *** recently-published QoS routing algorithms consider one or two metrics and most of them require the maintenance of a global network state at each *** paper is proposed a distributed routing algorithm which require every node to maintain only its local *** state information of intermediate nodes is collectively used to guide the routing messages along the most appropriate paths in order to maximize the success *** not only keeps the merits of simplicity and low link overhead in traditional QoS routing algorithm,but also can reduce resource fragments and admit more services into a network with heavy load.

关键词： Quality-of-Service Routing Distributed Algorithms NP-Complete Problem multiple Constraints multi-path

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

A Location-Based Multi-path Routing Approach in Ad Hoc Netwo...

A QoS-aware routing algorithm based on ant-cluster in wireless multimedia sensor networks

2010 Chinese Control and Decision Conference

作者： Qinghui Wang,Yongjie Lu School of Information Engineering,Shenyang Institute of Chemical Technology,Shenyang,110041

＜正＞In QoS routing for wired networks,multiple path routing is popularly *** of excessive routing overhead,algorithms are not well suited for ad hoc networks.A Location-Based multi-path Routing（LBMR） approach in Ad hoc is provided in this *** approach gets a shortest path by limiting the search for a new route to a smaller "request zone" of the ad hoc network（as in the LAR protocol） and uses intermediate nodes’ location information to find another disjoint path by using Dijkstra’s algorithm at destination *** multiple routes helps to minimize route recovery process and to control message overhead.A per-packet allocation scheme is arranged to distribute data packets into two paths of active *** results of simulation show that this routing method has good network performance with high packet delivery ratio,low control overload and low average end-to-end delay.

关键词： Ad Hoc Routing Location multi-path

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

Science China(Information Sciences) 2014年第10期57卷 77-92页

作者： HUANG HaiPing CAO Xiao WANG RuChuan WEN YongGang College of Computer Nanjing University of Posts and Telecommunications Jiangsu High Technology Research Key Laboratory for Wireless Sensor Networks Key Lab of Broadband Wireless Communication and Sensor Network Technology of Ministry of Education Nanjing University of Posts and Telecommunications School of Computer Engineering Nanyang Technological University

QoS-aware routing algorithm is important in wireless multimedia sensor networks. This paper formulates a generalized QoS-aware routing model on the basis of multiple routing metrics and priorities of packets. We first introduce a 2D plain-based routing algorithm IPACR which improves the standard ant colony algorithm by optimizing the initial distribution of artificial pheromone in order to accelerate the algorithm convergence rate. Then a clustering-based routing algorithm ICACR is presented which can be well applied in a large scale network. ICACR is a variation of IPACR because it can be suitable for clustering cases to satisfy the larger scale situations. Both the numerical algorithm performance analysis and simulation of IPACR and ICACR are given. The results show that ICACR outperforms IPACR in terms of both network lifetime and QoS-aware routing metrics in large scale wireless multimedia sensor networks. Moreover, the simulation based on the real video traces shows that by extending the multi-path to ICACR for different priorities of video frames better performance can be achieved.

关键词： ant colony clustering-based multi-path QoS-aware routing algorithm wireless multimedia sensor networks