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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...

引用

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...

引用

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

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

引用

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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Compressed sensing data fusion of monitoring cyanobacteria bloom-forming

Compressed sensing data fusion of monitoring cyanobacteria b...

引用

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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A new TCP design for satellite-HAP networks

A new TCP design for satellite-HAP networks

引用

6th China Conference of wireless sensor networks, CWSN 2012

作者： Wang, Sudan Sun, Lijuan Xiao, Fu Ye, Xiaoguo Wang, Ruchuan 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 recent years, several new TCP congestion control algorithms have been proposed to improve TCP performance for networks of high bandwidth delay products. Satellite-HAP networks providing high-speed data transmissions (up to 1 Gb/s). This article aims to show that the proposed new TCP, as a modification of TCPs congestion control mechanism, allows it to achieve reasonable performance in Satellite-HAP networks. In this paper, we implement the performance simulation in NS-2, and the results demonstrate that the proposed new TCP for Satellite-HAP networks has a considerable performance improvement comparing with the other variations of TCP. © 2013 Springer-Verlag.

关键词： Satellites

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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...

引用

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

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

引用

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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Low-cost VR system based on wireless accelerometer sensor

Low-cost VR system based on wireless accelerometer sensor

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6th China Conference of wireless sensor networks, CWSN 2012

作者： Jiang, Lingyun Wang, Ruchuan Qian, Wenxiang Lv, Yachao 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

Virtual reality(VR) games have been popular in recent years, developed in the form of the games by capturing the body's various physiological activities, including the surrounding environmental factors to achieve a colorful variety of game features. This paper presents a system using acceleration sensor to capture the body movements to achieve gaming method. First the user's motion is captured by accelerometer sensor, then the signals collected by sensor can be processed and sent to computer. Finally the motion data of virtual character are synthesized to the VR game by the common interface processing these data. This motion-imitate system is diversity with combining various other appliances and the price and difficulty of development is reduced comparing with the recent mainstream VR games developing method. © 2013 Springer-Verlag.

关键词： Virtual reality

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The research of routing forwarding strategies in DTNs based on convergence point

The research of routing forwarding strategies in DTNs based ...

引用

6th China Conference of wireless sensor networks, CWSN 2012

作者： Wang, Luxuan Sun, Lijuan Xiao, Fu Ye, Xiaoguo Wang, Ruchuan 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

DTN is developed as an emerging network technology which is mainly used in network with long waiting time, intermittent connectivity, and other extreme environments network. It has be favored in the military, transportation, marine monitoring, wildlife tracking, satellites communications and have been applied in some aspects. Currently, there is a lot of research about the DTN. The study includes three hot issues: the routing nodes, DTN-based mobility model and the data distribution and retrieval. To better solve the problem of data distribution and retrieval in DTN, an improved routing algorithm is proposed in this paper. © 2013 Springer-Verlag.

关键词： network protocols

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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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