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The research on network traffic modeling based on chaotic time series

Journal of Computational Information Systems 2012年第8期8卷 3323-3330页

作者： Yin, Ansheng Zhang, Shunyi Qi, Jin Key Lab. of Broadband Wireless Communication and Sensor Network Technology Nanjing University of Posts and Telecommunications Ministry of Education Nanjing 210003 China Institute of Information and Network Technology Nanjing University of Posts and Telecommunication No. 66 Xin Mofan Road Nanjing 210003 China

Spurred by the need of network monitoring and security, network traffic modeling is a much discussed research topic. However, the classical Markov flow model is no longer suitable for packet-switched network because of such network properties as self-similarity and long-range dependence. This paper presents a network traffic model based on chaotic time series which can predict the network traffic with smaller error than other models through experiments. © 2012 Binary Information Press.

关键词： Packet switching

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Error concealment techniques for video transmission over error-prone channels: a survey

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Journal of Computational Information Systems 2012年第21期8卷 8807-8818页

作者： Cui, Ziguan Gan, Zongliang Zhan, Xuefeng Zhu, Xiuchang Image Processing and Image Communication Lab Nanjing University of Posts and Telecommunications Nanjing 210003 China Key Lab of 'Broadband Wireless Communication and Sensor Network Technology' Nanjing University of Posts and Telecommunications Ministry of Education China Institute of Physics and Communication Electronics Jiangxi Normal University Nanchang 330027 China

Efficient video transmission over unreliable channels may encounter huge challenge due to unavoidable bit error or packets loss. Error concealment (EC) techniques at the decoder side have been developed to recover the damaged regions utilizing spatial or temporal redundant information without changing the encoder structure or adding extra bandwidth. In this work the classic EC techniques and their developments are first reviewed, high-level semantics based EC schemes are also surveyed, and then the emphasis is focused on new EC features introduced by H.264/AVC. Finally, the challenges and future development directions in EC for advanced video coding schemes such as scalable video coding (SVC), multiple description coding (MDC), multi-view video coding (MVC) and stereo video coding are prospected, and future research directions are also indicated according to the current research status and existent problems. © 2012 Binary Information Press.

关键词： Scalable video coding

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Homomorphic Signature for Identity Authentication in Cloud Computing

Homomorphic Signature for Identity Authentication in Cloud C...

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中国密码学会2012年会

作者： Zhiwei Wang Wei Zhang Danwei Chen College of Computer Nanjing University of Posts and TelecommunicationsNanjingJiangsu 210003China Jiangsu High Technology Research Key Laboratory for Wireless Sensor Networks NanjingJiangsu 210003 Key Lab of Broadband Wireless Communication and Sensor Network Technology(Nanjing University of Post

In this paper,we introduce a new kind of homomorphic signature,which is suitable for identity authentication in cloud computing.A user firstly computes the full signature on its all identity attributes,and sends the full signature to the intermediate channel server (the intermediate channel server should check and verify it).During the valid period of his full signature,if the user wants to require a cloud service on a special identity (only involves part of identity attributes),he only needs to securely send a {0,1}n vector to the intermediate channel *** intermediate channel server who doesn't know the secret key can compute the partial signature on the special identity,and then sends it to the cloud *** give a formal secure definition of this homomorphic signature,and construct a scheme from GHR *** prove that our scheme is secure under GHR signature.

关键词： homomorphic signature identity authentication cloud computing GHR signature strong RSA assumption

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An efficient coverage control algorithm for three-dimensional underwater sensor networks

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Advances in Information Sciences and Service Sciences 2012年第10期4卷 393-399页

作者： Xiao, Fu Yang, Yang Sun, Li Wang, Ruchuan Nanjing University of Posts and Telecommunications Nanjing 210003 China Provincial Key Laboratory for Computer Information Processing Technology Soochow University Suzhou 215006 China Jiangsu High Technology Research Key Laboratory for Wireless Sensor Networks Nanjing 210003 China Key Lab of Broadband Wireless Communication and Sensor Network Technology Ministry of Education Nanjing 210003 China

Strategy of sensor nodes deployment is directly related to the cost and performance for underwater wireless sensor networks, which is largely determined the various service-quality improvement of wireless sensor networks. In order to improve the coverage of the target area, this paper presents a distributed algorithm of coverage control. Assume that nodes initially deployed on the surface of the water and can only move in vertical direction in 3-D space, the algorithm is first to control the nodes in-depth and relocate the nodes at different depths, then the nodes continue to adjust their depths until there is no augment for improving their coverage, and to achieve efficient coverage of the three-dimensional sensor networks ultimately. Experimental results show that compared with traditional random deployment method, the proposed coverage control algorithm can improve coverage of network effectively.

关键词： Quality control

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FoVs correlation model for wireless multimedia sensor networks based on three-dimensional perception

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Advances in Information Sciences and Service Sciences 2012年第3期4卷 27-34页

作者： Han, Chong Sun, Lijuan Xiao, Fu Guo, Jian Wang, Ruchuan College of Computer Nanjing University of Posts and Telecommunications Nanjing 210003 China Jiangsu High Technology Research Key Laboratory for Wireless Sensor Networks Nanjing 210003 China Key Lab of Broadband Wireless Communication and Sensor Network Technology Nanjing University of Posts and Telecommunications Ministry of Education Jiangsu Province Nanjing 210003 China

Wireless multimedia sensor networks have become the focus of research in a wide variety of areas in recent years. The camera sensor nodes observe the phenomenon at different locations in the field, and the spatially proximal cameras could have highly overlapped field of views (FoVs). Based on the three-dimensional sensing model of camera sensor node, a FoVs correlation model was proposed in this paper. Then, a grid-based and a relative position-based approach were respectively designed to calculate the correlation coefficient between two cameras. Simulation results and algorithm complexity analysis demonstrate that the relative position-based method has highly efficiency and nearly reduces two orders of magnitude of time complexity to the former.

关键词： sensor nodes

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A non-deterministic evaluation on SLA in cloud markets

International Journal of Digital Content Technology and its ...

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International Journal of Digital Content technology and its Applications 2012年第23期6卷 838-848页

作者： Xu, Jin-Song Yang, Geng Huang, Wan-Ming Xu, Xiao-Long Key Lab of Broadband Wireless Communication and Sensor Network Technology Ministry of Education China College of Computer Nanjing University of Post and Telecommunications China TongDa College Nanjing University of Post and Telecommunications China State Key Laboratory for Novel Software Technology Nanjing University China

The primary issue in dynamic cloud computing environments is how to select and schedule the ideal and different cloud resources to cooperation in order to guarantee the requirements of applications. This paper proposed a novel cloud services selection algorithm for hierarchy evaluation of SLA, which is selecting the proper resources to compromise services. The service level agreement can only ensure completion of the application. Through fuzzing the SLA attribute, this paper conducted a non-deterministic evaluation on the SLA attribute data provided by cloud service providers using variable weights. Based on the relationships among different SLA attributes, a better cloud service will be selected in a Service Oriented Architecture. The experimental results show the effectiveness of the algorithm: there is no force in the relationship between sub-tasks in the case, each cloud resource and service providers can effectively reduce the cost of application based on recommendations;with the introduction of mandatory use of strong relationships and recommendation of service resources, the effectiveness of the application is ensured while reducing the total consumption of services;the right way to use fuzzy variable cloud resources involved in service evaluation will help to cut the cost of commercial cloud services and providing users with better services.

关键词： Cloud computing

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Mean shift object tracking with modified LTP

Mean shift object tracking with modified LTP

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International Conference on Signal Processing Proceedings (ICSP)

作者： Shaona Zhang Dong Hu Yanting Hu Education Ministry's Key Lab of Broadband Wireless Communication and Sensor Network Technology Nanjing University of Posts and Telecommunications China School of Telecommunication and Information Engineering Nanjing University of Posts and Telecommunications China

A new scheme of object tracking with mean shift is put forward in this paper. At first, texture feature is fused in the processing by Local Ternary Pattern (LTP). Since LTP is sensitive to local noise, least median of squares (LMedS) algorithm is used to adaptively calculate the noise threshold for accurate estimation of the LTP texture information. Furthermore, target scale and orientation is estimated in case of partial occlusion or rotation, so as to realize robust object tracking. Experimental results show that the proposed algorithm can acquire robust tracking performance under complex background .

关键词： Histograms Target tracking Image color analysis Object tracking Heuristic algorithms Computational modeling Kernel

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Relay power allocation in auction-based game approach

Relay power allocation in auction-based game approach

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IEEE Global communications Conference

作者： Dan Wu Yueming Cai Zhou, Liang Rodrigues, Joel Institute of Communications Engineering PLA University of Science and Technology The Key Lab of Broadband Wireless Communication and Sensor Network Technology (Nanjing University of Posts and Telecommunications) Ministry of Education Institute de Telecomunicacoes University of Beira Interior

ISBN: (纸本)9781467309202

In this work, with respect to the uncertainty about the individual information, we investigate the relay power allocation problem from the energy-efficient, Pareto optimal, and competitive fairness perspective. At first, we design an easy-implementation energy efficiency metric, which aims at striking a balance between the QoS provisioning and the energy consumption. Then, an auction mechanism is proposed for relay power allocation. By transferring the auction mechanism into a game, we prove the existence, uniqueness, and Pareto optimality of the Nash equilibrium (NE) for our auction game, and show that the allocation strategies from the NE can achieve the energy efficiency in terms of the proposed metric. Next, we develop a distributed relay power allocation algorithm based on our best-response functions to reach the Pareto optimal NE. Importantly, we not only certify the convergence of the proposed algorithm, but also provide quantitative analysis on it. Extensive simulations results are conducted to confirm the validity of the analytical results.

关键词： Wireless cooperative networks Auction theory Energy efficiency Power allocation Outage probability

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A random linear coding algorithm for cognitive wireless mesh networks

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Journal of Convergence Information technology 2012年第6期7卷 112-120页

作者： Qi, Jin Zhang, Shunyi Li, Shujing Cao, Lu Key Lab of Broadband Wireless Communication and Sensor Network Technology Nanjing University of Posts and Telecommunications Ministry of Education Nanjing 210003 China Institute of Information and Network Technology Nanjing University of Posts and Telecommunication Nanjing 210003 China College of Information Engineering FuYang Teachers' College Fuyang 236000 China

In viewing of the problem that network coding can improve network throughput as well as increase network complexity, this paper proposed a special cognitive wireless mesh network topology while constructed a novel coding algorithm. In the multicast model based on wireless channel, the algorithm improved information transmission rate to some extent with random linear processing of data at intermediate nodes, therefore transported several combinations of data messages. Compared with traditional random message distribution algorithms, the proposed algorithm can reduce transmission number of source packets effectively and improve network throughput measured with network coding gain. The effectiveness of the algorithm has been verified by the theoretical deduction and experimental results.

关键词： network coding

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Cognitive networks available resource health assessment model based on intelligent agent

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Advances in Information Sciences and Service Sciences 2012年第5期4卷 226-234页

作者： Qi, Jin Zhang, Shunyi Li, Linguo Sun, Yanfei Key Lab of Broadband Wireless Communication and Sensor Network Technology Nanjing University of Posts and Telecommunication Ministry of Education Nanjing 210003 China Institute of Information and Network Technology Nanjing University of Posts and Telecommunication Nanjing 210003 China College of Information Engineering FuYang Teachers' College Fuyang 236000 China

Refers to the both dynamic and multivariate network environment, we proposed a cognitive networks(CNs) available resource health assessment model, did health assessment of CNs resource availability through comprehensive fuzzy assessment model based on intelligent agent according to user Quality of Service(QoS) combined with network real-time state. Finally, by taking video on demand (VOD) as an example, we assessed the health degree of VOD service. The experimental results represented that the proposed approach can real-timely assess overall network performance as well as CNs available resource health effectively, therefore further guarantee the CNs overall performance and service end to end QoS.

关键词： Health

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