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Domain-epidemic spray and forward routing algorithm of opportunistic networks

International Journal of Information and communication technology 2013年第3-4期5卷 332-342页

作者： Zhang, Deng-Yin Cui, Lei Key Lab of Broadband Wireless Communication and Sensor Network Technology Nanjing University of Posts and Telecommunications Ministry of Education Nanjing 210003 China

For the current opportunistic networks routing algorithms, their message arrival rate is not high and the delivery delay is large. This paper proposes a domain-epidemic spray and forward routing algorithm. The algorithm integrates redundancy and encounter prediction strategy. According to the probability of encounters between nodes, the nodes are divided into different domains. The spray and forward strategy is used between domains and the epidemic strategy is used to forward messages within a domain. Using the message confirmation mechanism and a list which is used to record the messages that have arrived to their destination, the new algorithm can effectively reduce redundant messages. Simulation results show our algorithm can effectively improve message arrival rate and reduce end-to-end delay to some extent. © 2013 Inderscience Enterprises Ltd.

关键词： Routing algorithms

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Distributed multi-sensor tracking in wireless networks using nonparametric variant of sum-product algorithm

Distributed multi-sensor tracking in wireless networks using...

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Asia-Pacific Conference on communications

作者： Wei Li Zhen Yang Haifeng Hu Key Lab of Broadband Wireless Communication and Sensor Network Technology Nanjing University of Posts and Telecommunications Nanjing China

Graphical models have been widely applied in solving distributed inference problems in wireless sensor networks (WSNs). In this paper, we formulate the distributed multi-sensor tracking problem in a WSN as an inference problem on a factor graph. Using particle filtering methods, we propose a nonparametric variant of sum-product algorithm (SPA), called sequential particle-based SPA (SPSPA), for factor graphs to infer the multi-sensor target states over time. In the proposed algorithm, importance sampling methods are used to sample from message products, and the computational complexity of SPSPA is thus linear in the number of particles. We apply the SPSPA to a distributed multi-sensor tracking problem, and evaluate its performance in terms of the measurement noise and the number of particles.

关键词： wireless sensor networks wireless communication Filtering Noise measurement

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Design and Optimization of Socket Mechanism for Services in Internet of Things

Design and Optimization of Socket Mechanism for Services in ...

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2013 22nd wireless and Optical communication Conference

作者： Kun Wang Yuhua Zhang Yue Yu Yan Li Key Lab of Broadband Wireless Communication and Sensor Network Technology(Nanjing University of Posts and Telecommunications) Ministry of Education

ISBN: (纸本)9781467356985

It is necessary for a server oriented to the Internet of Things(IOT) applications to provide countless connections with efficient andreliable *** the communication layer should try to lower the *** a highly efficient design for a socket server with buffer pool and a thread pool for concurrent request on the IOT platform is *** reduces the system overhead and buffer usage to the largest extent while faced with a large number of connections and digital *** simulation shows that a socket server with a thread pool and buffer pool could lower the overhead on the context switch of threads as well as the I/O *** creates and destroys threads so as to energize the system.

关键词： IOT platform,thread pool,socket,modeling,optimization,simulation

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Content Centric networking: A New Approach to Big Data Distribution

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ZTE communications 2013年第2期11卷 3-10页

作者： Yi Zhu Zhengkun Mi Key Lab of Broadband Wireless Communication and Sensor Network Technology Nanjing University of Posts and Telecommunications School of Computer Science and Telecommunication Engineering University of Jiangsu

In this paper, we explore network architecture anal key technologies for content-centric networking （CCN）, an emerging networking technology in the big-data era. We descrihe the structure anti operation mechanism of tl CCN node. Then we discuss mobility management, routing strategy, and caching policy in CCN. For better network performance, we propose a probability cache replacement policy that is based on cotent popularity. We also propose and evaluate a probability cache with evicted copy-up decision policy.

关键词： big data content-centric networking caching policy, mobility management routing strategy

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A new variant of sum-product algorithm for sensor self-localization in wireless networks

A new variant of sum-product algorithm for sensor self-local...

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IEEE International Conference on communications in China (ICCC)

作者： Wei Li Zhen Yang Haifeng Hu Key Lab of Broadband Wireless Communication and Sensor Network Technology Nanjing University of Posts and Telecommunications Nanjing China

Graphical models have been widely applied in solving distributed inference problems in wireless sensor networks (WSNs). In this paper, we formulate the sensor self-localization problem in a WSN as an inference problem on a factor graph. Using a sequential schedule of message updates, a sequential uniformly reweighted sum-product algorithm (SURW-SPA) is developed for self-localization problems. The proposed algorithm combines the distributed nature of belief propagation (BP) with the improved performance of sequential tree-reweighted message passing (TRW-S) algorithm. We apply the SURW-SPA to sensor self-localization in large-scale static networks, and evaluate its performance in terms of localization accuracy and convergence speed.

关键词： wireless sensor networks Message passing Schedules Belief propagation Sum product algorithm wireless networks

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Image Hiding Algorithm in Discrete Cosine Transform Domain Based on Grey Prediction and Grey Relational Analysis

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China communications 2013年第7期10卷 57-70页

作者：黄海平黄世超陈九天王汝传 College of Computer Nanjing University of Posts and Telecommunications Jiangsu High Technology Research Key Laboratory for Wireless Sensor Networks Key Laboratory of Broadband Wireless Communication and Sensor Network Technology of Ministry of Education Nanjing University of Posts and Telecommunications Jiangsu Provincial Key Laboratory for Computer Information Processing Technology Soochow University

Traditional information hiding algorithms cannot maintain a good balance of capacity,invisibility and *** this paper,a novel blind colour image information hiding algorithm based on grey prediction and grey relational analysis in the Discrete Cosine Transform(DCT) domain is ***,this algorithm compresses the secret image losslessly based on the improved grey prediction GM(1,1)(IGM) *** then chooses the blocks of rich texture in the cover image as the embedding regions using Double-dimension Grey Relational Analysis(DGRA).Finally,it adaptively embeds the compressed secret bits stream into the DCT domain mid-frequency coefficients,which are decided by those blocks' Double-Dimension Grey Correlation Degree(DGCD) and Human Visual System(HVS).This method can ensure an adequate balance between invisibility,capacity and *** results show that the proposed algorithm is robust against JPEG compression(46.724 6 dB when the compression quality factor is 90%),Gaussian noise(45.531 3 dB when the parameter is(0,0.000 5)) etc.,and it is a blind information hiding algorithm that can be extracted without an original carrier.

关键词： image information hiding IGM DGRA blind information hiding DCT

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A dynamic web services selection algorithm based on trust model for grid environment

A dynamic web services selection algorithm based on trust mo...

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6th China Conference of wireless sensor networks, CWSN 2012

作者： Zhang, Lin Liu, Zhengbang Wang, Ruchuan Wang, Haiyan College of Computer Nanjing University of Posts and Telecommunications Jiangsu Province Nanjing 210003 China Jiangsu High Technology Research Key Laboratory for Wireless Sensor Networks Nanjing University of Posts and Telecommunications Jiangsu Province Nanjing 210003 China Key Lab. of Broadband Wireless Communication and Sensor Network Technology Ministry of Education Nanjing University of Posts and Telecommunications Jiangsu Province Nanjing 210003 China

ISBN: (纸本)9783642362514

In order to find the service nodes, which the users are satisfied with, in a high speed and efficiency in open network environment, a new grid-oriented multi-level service selection model is proposed, which is based on the concept of user-similarity group. On this condition, direct trust calculation based on time decay is given and fine-grained recommendation trust calculation is studied, which can distinguish the ability of honesty. In addition, based on activity level of nodes, dynamic weight-allocation method is proposed, which can make the prediction results be closer to the fact. After job-interaction, the update algorithm about honesty ability of recommendation nodes is researched, which will provide more reasonable and reliable reference for the next prediction. Simulation results show that the service selection model and trust calculation methods are reasonable and accurate. © 2013 Springer-Verlag.

关键词： Grid computing

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R-AODV: A cognitive AODV routing algorithm in wireless network

R-AODV: A cognitive AODV routing algorithm in wireless netwo...

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6th China Conference of wireless sensor networks, CWSN 2012

作者： Ye, Xiaoguo Dong, Feifei Wang, Ruchuan College of Computer Nanjing University of Posts and Telecommunications Nanjing Jiangsu 210003 China Jiangsu High Technology Research Key Laboratory for Wireless Sensor Networks Nanjing University of Posts and Telecommunications Nanjing Jiangsu 210003 China Key Lab. of Broadband Wireless Communication and Sensor Network Technology Nanjing University of Posts and Telecommunications Ministry of Education Jiangsu Province Nanjing Jiangsu 210003 China

ISBN: (纸本)9783642362514

wireless communication system plays a more and more important role in many fields. wireless network using traditional AODV algorithm only considers the minimal hop of all routes and can not meet specific QoS requirements. Some network resources will be wasted to some extend using traditional algorithm. A cognitive routing algorithm, R-AODV, which is based on the AODV algorithm, is proposed in this paper. The new proposed algorithm collects network status and chooses different routing strategy to make the best use of network resources. It may collect network status before having routing algorithm and according to different conditions of current network to choose different routing algorithm, which may make the best use of network resources. © 2013 Springer-Verlag.

关键词： Quality of service

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Compressed sensing data fusion of monitoring cyanobacteria bloom-forming

Compressed sensing data fusion of monitoring cyanobacteria b...

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6th China Conference of wireless sensor networks, CWSN 2012

作者： Zou, Zhiqiang Li, Zeting Zhao, Hao Hu, Cunchen Zhang, Fei College of Computer Nanjing University of Posts and Telecommunications Nanjing Jiangsu 210003 China Jiangsu High Technology Research Key Laboratory for Wireless Sensor Networks Nanjing University of Posts and Telecommunications Nanjing Jiangsu 210003 China Key Lab. of Broadband Wireless Communication and Sensor Network Technology Nanjing University of Posts and Telecommunications Ministry of Education Jiangsu Province Nanjing Jiangsu 210003 China

ISBN: (纸本)9783642362514

wireless senor networks have more and more applications while fundamental constraint still exists, such as limited power supply and bandwidth. When the sensing signal exhibits spare, we can sampling only a part of signal corresponding to nonzero coefficients. Inspired by recent results in theory of compressive sensing (CS), we propose a data fusion method based on CS. First, we describe the distributed data fusion in UWSNs based on CS. Then, we present a monitoring model of the cyanobacteria bloom-forming (CBF). Finally, we demonstrate the performance analysis and provide concluding remarks. © 2013 Springer-Verlag.

关键词： Compressed sensing

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AR-HS: Ant routing optimized algorithm on HAPs-satellite integrated networks

AR-HS: Ant routing optimized algorithm on HAPs-satellite int...

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6th China Conference of wireless sensor networks, CWSN 2012

作者： Ye, Xiaoguo Cheng, Huimin Wang, Ruchuan College of Computer Nanjing University of Posts and Telecommunications Nanjing Jiangsu 210003 China Jiangsu High Technology Research Key Laboratory for Wireless Sensor Networks Nanjing University of Posts and Telecommunications Nanjing Jiangsu 210003 China Key Lab. of Broadband Wireless Communication and Sensor Network Technology Nanjing University of Posts and Telecommunications Ministry of Education Jiangsu Province Nanjing Jiangsu 210003 China

ISBN: (纸本)9783642362514

The routing optimized problem in HAPs-Satellite integrated network is focused on this paper. A novel routing algorithm(AR-HS) based on the swarm intelligence by changing the pheromone updating strategy is proposed. In order to build an optimal solution, the proposed algorithm make use of ant agents that consist of probe packets sent on the HAPs-Satellite integrated network that allow to find the optimization problem solution. In this work we have performed a comparison of a classical shortest path algorithm with our the proposed algorithm ,and the simulation results show that our routing algorithm can reduce end to end delay and drop ratio, and improve performance of network. © 2013 Springer-Verlag.

关键词： Satellites

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