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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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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 ...

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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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Erratum to: Distributed beamforming designs to improve physical layer security in wireless relay networks

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EURASIP Journal on Advances in Signal Processing 2014年第1期2014卷 1-1页

作者： Mujun Qian Chen Liu Youhua Fu The Key Lab of Broadband Wireless Communication and Sensor Network Technology (Ministry of Education) Nanjing University of Posts and Telecommunications Nanjing Jiangsu China National Mobile Communications Research Laboratory Southeast University Nanjing Jiangsu China

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Average Level Crossing Rate and Fading Duration of Multiuser Single Relay Cooperation wireless Uplinks

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China communications 2013年第4期10卷 135-143页

作者：贾向东杨龙祥朱洪波 Wireless Communications Key Laboratory of Jiangsu Province Nanjing University of Posts and Telecommunications Key Laboratory of Broadband Wireless Communication and Sensor Network Technology Nanjing University of Posts and Telecommunications Ministry of Education College of Computer Science and Engineering Northwest Normal University

We investigate the average Level Crossing Rate （LCR） and Average Fading Duration （AFD） of multiuser single relay co- operation wireless uplinks over independent and non-identically distributed （***.d） Ray- leigh fading channels. We first present the statistical analyses of the first-hop equivalent envelope. Then, we investigate the LCR and AFD of an equivalent end-to-end envelope, and present the closed-form solutions to LCR and AFD, which are given with integral forms. Finally, we derive the Laplace approximations of LCR and AFD as well as the upper and lower bounds. The numerical results of LCR show that the upper bound is tight. For multi user systems with different number of mobile users, the analyses indicate that the LCRs are approximately the same at the low level of the envelope. envelope However, there are at the high level of the reasonable differences among the curves of LCRs. Due to that fact that AFD is the inverse function of LCR, the results for AFD are the opposite.

关键词： wireless communications multiuseruplinks level crossing rate average fadingduration

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A robust object tracking algorithm based on SURF

A robust object tracking algorithm based on SURF

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International Conference on wireless communications and Signal Processing (WCSP)

作者： Dan Zhou Dong Hu Education Ministry's Key Lab of Broadband Wireless Communication and Sensor Network Technology Nanjing University of Posts and Telecommunications 210003 China

In this paper, we propose a robust object tracking algorithm based on SURF. First, we adopt a two-stage matching method to improve the accuracy of SURF matching points. Then a template update method is used to deal with the problem of object appearance change. Next we use matching points between new template and candidate region to locate the initial position of object. As template update and object occlusion will cause the accumulation of tracking errors, therefore, at last fixed template is used to correct object's position. For those frames which have little matching points, we use Meanshift instead of SURF to track object. The experiments demonstrate that our work is robust and can track object accurately in complex environments.

关键词： Target tracking Object tracking Video sequences Robustness Mathematical model Vectors

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Server-Aided Verification Proxy Re-signature

Server-Aided Verification Proxy Re-signature

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IEEE International Conference on Trust, Security and Privacy in Computing and communications (TrustCom)

作者： Zhiwei Wang Wei Lv Key Lab of Broadband Wireless Communication and Sensor Network Technology Ministry of Education Nanjing Jiangsu Province P.R. China

Proxy re-signature is proposed by Blaze, Blemmer and Strauss (BBS), in which a semi-trusted proxy acts as a translator converts a signature from Alice into a signature from Bob on the same message. Proxy re-signature is a very useful tool for the interoperable DRM architecture and the proof of passed path in cloud computing. However, cloud users usually are mobile devices which are constrained with processing and power limitations. When a mobile user obtain the converted signature from the proxy (cloud server), it still can not verify it due to the heavy computation cost. We propose a new definition of server-aided verification proxy re-signature which consist of a proxy re-signature scheme and a server-aided verification protocol. With the server-aided verification protocol, some computational tasks for a proxy re-signature verification are carried out by the proxy (cloud server), which is generally untrusted, therefore, it is very useful for mobile devices. We present, on the basis of Ateniese and Hohenberger's unidirectional proxy re-signature scheme, two novel existential unforgeability server-aided verification proxy re-signature schemes.

关键词： Servers Protocols Cloud computing Mobile communication Public key

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Improvement on Ahn et al.'s RSA P-homomorphic signature scheme

Improvement on Ahn et al.'s RSA P-homomorphic signature sche...

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8th International ICST Conference on Security and Privacy in communication networks, SecureComm 2012

作者： Wang, Zhiwei College of Computer Nanjing University of Posts and Telecommunications Nanjing Jiangsu 210003 China State Key Laboratory of Information Security Institute of Information Engineering Chinese Academy of Sciences Beijing 100190 China Jiangsu High Technology Research Key Laboratory for Wireless Sensor Networks 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)9783642368820

P-homomorphic signature is a general framework for computing on authenticated data, which is recently proposed by Ahn et al. With P-homomorphic signature, any third party can derive a signature on the object message m′ from a signature of m, if m′ and m satisfy P(m,m′) = 1 for some predicate P which denotes the authenticatable relationship between m′ and m. Ahn et al. proposed a RSA P-homomorphic signature scheme by using a RSA accumulator, which is very efficient in space. However, the computational cost of verification and derivation is very heavy. We present an improved P-homomorphic signature scheme based on factoring problem. In our construction, the time efficiency of both verification and derivation are much better than Ahn's scheme. © 2013 ICST Institute for Computer Science, Social Informatics and Telecommunications Engineering.

关键词： Authentication

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Mining Frequent Itemsets in Data Streams Based on Genetic Algorithm

Mining Frequent Itemsets in Data Streams Based on Genetic Al...

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2013 15th IEEE International Conference on communication technology

作者： Chong Han Lijuan Sun Jian Guo Xiaodong Chen 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 Ministry of Education of Jiangsu Province

ISBN: (纸本)9781479900763

Stream data is a very common data type in big data and in many data streams applications,users tend to pay more attention to the mode information of the data *** mining frequent patterns in data streams is a significative ***,finding frequent itemests in a data set with predefined fixed support threshold could be seen as an optimization *** this paper,the problem of frequent itemsets mining is derived as a non-linear optimization problem,then genetic algorithm is adopted to solve *** the formal and bitmap representation of frequent itemsets,the non-linear optimization problem is transformed to 0-1 programming.A set of experimental results show that unlike typical Apriori algorithm,the complexity of time and memory space grows exponentially as the support decrease,our proposed algorithm has a high time and space efficiency even with a very low support.

关键词： Big data,data streams,genetic algorithm,frequent itemsets

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Virtual network embedding by node-splitting

Virtual network embedding by node-splitting

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2013 15th IEEE International Conference on communication technology

作者： Jiandong Huang Qian Wu Yu Liu Bing Wang Wennai Wang Key Lab of Broadband Wireless Communication and Sensor Network Technology Ministry of Education College of Telecommunication & Information Engineering Nanjing University of Posts and Telecommunications

network virtualization,as a fundamental technology of Future Internet Architecture,has been used to overcome the ossification of the current *** paper focuses on virtual nodes splitting for aggregating the diverse physical resources in the issue of virtual network embedding(VNE),which is used for the resource allocation in network virtualization.A mixed integer programming(MIP) problem has been proposed by taking both path-splitting and node-splitting into *** feasibility of virtual node splitting is analyzed and a corresponding formal expression is *** VNE performance is evaluated using by a generic MIP solver over a NSFNET *** numerical evaluations in this paper show that,comparing with the approaches for VNE without node-splitting,the proposed algorithm is beneficial to reduce VNE cost,as well as to increase VN acceptance ratio.

关键词： network virtualization Virtual network mapping Node splitting Performance simulation Acceptance ratio

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