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2012 International Conference on Web Information Systems and Mining, WISM 2012

作者： Zhu, Wei Yang, Geng Xu, Jian Yang, Xiao-Ling College of Science Nanjing University of Posts and Telecommunications Nanjing 210003 Jiangsu China Key Lab of Broadband Wireless Communication and Sensor Network Technology Ministry of Education Nanjing University of Posts and Telecommunications Nanjing 210003 Jiangsu China

ISBN: (纸本)9783642334689

A new scheme of information encryption is presented in this paper, which employs Chen's chaos to construct the random mask of the virtual optical imaging system instead of randomly generated by computer. The generation of random mask, the procedures of encryption and decryption are described in detail. Numerical simulations prove that the constructed random mask is uniformly distributed and the encryption algorithm is effective. The experimental results also demonstrate that the proposed encryption algorithm has advantages of large key space and high key sensitivities. © Springer-Verlag Berlin Heidelberg 2012.

关键词： Imaging systems

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Co-whitening of i-vectors for short and long duration speaker verification 19

Co-whitening of i-vectors for short and long duration speake...

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19th Annual Conference of the International Speech communication, INTERSPEECH 2018

作者： Xu, Longting Lee, Kong Aik Li, Haizhou Yang, Zhen Department of Electrical and Computer Engineering National University of Singapore Singapore Data Science Research Laboratories NEC Corporation Japan Broadband Wireless Communication and Sensor Network Technology Key Lab Nanjing University of Posts and Telecommunications China

An i-vector is a fixed-length and low-rank representation of a speech utterance. It has been used extensively in text-independent speaker verification. Ideally, speech utterances from the same speaker would map to an unique i-vector. However, this is not the case due to some intrinsic and extrinsic factors like physical condition of the speaker, channel difference, noise and notably the duration of speech utterances. In particular, we found that i-vectors extracted from short utterances exhibit larger variance than that of long utterances. To address the problem, we propose a co-whitening approach, taking into account the duration, while maximizing the correlation between the i-vectors of short and long duration. The proposed co-whitening method was derived based on canonical correlation analysis (CCA). Experimental results on NIST SRE 2010 show that co-whitening method is effective in compensating the duration mismatch, leading to a reduction of up to 13.07% in equal error rate (EER). © 2018 International Speech communication Association. All rights reserved.

关键词： Vectors

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A noval data collection approach for Wirelsee sensor networks

A noval data collection approach for Wirelsee Sensor Network...

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2nd Annual Conference on Electrical and Control Engineering, ICECE 2011

作者： Wang, Haiyong Yang, Geng Xu, Jian Chen, Zhengyu Chen, Lei Yang, Zhen College of Internet of Things Nanjing University of Posts and Telecommunications Nanjing 210003 Jiangsu China Key Lab of Broadband Wireless Communication and Sensor Network Technology Ministry of Education Nanjing University of Post and Telecommunications Nanjing 210003 China

ISBN: (纸本)9781424481637

The unmanned nature of wireless sensor networks make them very vulnerable to the malicious attacks. Therefore, how to complete secure data collection under different conditions is the crucial issue to wireless sensor networks. There have been a few on-going research efforts about multipath routing for secure data collection. In this paper, we make full use of the broadcast message when wireless sensor network initializes to construct secure multipath routing for secure data collection which will cause little overhead to the sensor nodes in the network. In accordance with the simulation results, the algorithm in this paper compares with other recent researches is better. © 2011 IEEE.

关键词： sensor nodes

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A new TCP design for satellite-HAP networks

A new TCP design for satellite-HAP networks

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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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An improved static B+ tree index adaptive to cloud environment for analytic application 5th

An improved static B+ tree index adaptive to cloud environme...

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5th International Conference on Environmental Science and Information Application technology, ESIAT 2014

作者： Wan, Mingxiang Ren, Chunshao Zhang, Dengyin Key Lab of Broadband Wireless Communication and Sensor Network Technology Nanjing University of Posts and Telecommunication Ministry of Education Nanjing China Sci-tech Park of Internet of Things Nanjing University of Posts and Telecommunication Nanjing210003 China

ISBN: (纸本)9781138028142

B+ Tree is a special balanced multiway tree with flexible structure and node pages linking to each other. It supports not only rapid random query, but also range query. But B+ Tree index cannot be directly migrated since data storage architecture is different in cloud environment. Based on the characteristics of cloud computing master-slave architecture and combined with the characteristics of the columnar storage in the cloud environment, this paper proposes an improved secondary index of B+ Tree. In this index, primary key still uses key-Value style hash index, which can not only get high search efficiency, but also maintain load balance;other property columns will apply improved B+ Tree index, which can solve the problem of high time complexity when querying non-primary key and also support range query of non-primary key property. © 2015 Taylor & Francis Group, London.

关键词： Flexible structures

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Performance analysis of data aggregation algorithms in wireless sensor networks

Performance analysis of data aggregation algorithms in wirel...

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2nd Annual Conference on Electrical and Control Engineering, ICECE 2011

作者： Xu, Jian Yang, Geng Chen, Zheng-Yu Chen, Lei Yang, Zhen College of Computer Science and Technology Nanjing University of Posts and Telecommunications Nanjing 210003 Jiangsu China Key Lab of Broadband Wireless Communication and Sensor Network Technology Ministry of Education Nanjing University of Posts and Telecommunications Nanjing 210003 Jiangsu China

ISBN: (纸本)9781424481637

Resource-constrained is a critical issue in wireless sensor networks (WSN) applications. Data aggregation (or data fusion) is one of the key techniques to solve the problem. Data aggregation can effectively reduce the data traffic, thereby reduce energy consumption, and extend the network's survival time. The research of data aggregation relates to many aspects of technology, so that the design of efficient data aggregation algorithm is a challenging task. In this paper, we investigate the effect of essential operations, scheduling algorithm and aggregation tree construction, has on data aggregation performance. The main performance such as end-to-end delay and energy-consumption of different aggregation schemes has been studied and measured by simulation experiment. © 2011 IEEE.

关键词： Scheduling algorithms

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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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Measurement-based entanglement purification for entangled coherent states

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Frontiers of physics 2022年第2期17卷 71-81页

作者： Pei-Shun Yan Lan Zhou Wei Zhong Yu-Bo Sheng Institute of Quantum Information and Technology Nanjing University of Posts and TelecommunicationsNanjing 210003China School of Science Nanjing University of Posts and TelecommunicationsNanjing 210003China Institute of Signal Processing Transmission Nanjing University of Posts and TelecommunicationsNanjing 210003China Key Lab of Broadband Wireless Communication and Sensor Network Technology Ministry of EducationNanjing University of Posts and TelecommunicationsNanjing 210003China

The entangled coherent states(ECSs)have been widely used to realize quantum information processing ***,the ECSs may suffer from photon loss and decoherence due to the inherent noise in quantum channel,which may degrade the fidelity of *** overcome these obstacles,we present a measurement-based entanglement purification protocol(MBEPP)for ECSs to distill some highquality ECSs from a large number of low-quality *** first show the principle of this MBEPP without considering the photon *** that,we prove that this MBEPP is feasible to correct the error resulted from the photon ***,this MBEPP only requires to operate the Bell state measurement without performing local two-qubit gates on the noisy pairs and the purified high-quality ECSs can be preserved for other *** MBEPP may have application potential in the implementation of long-distance quantum communication.

关键词： measurement-based entanglement purification entangled coherent state photon loss decoherence

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Interference Source Location Based on Spaceborne Multi-beam Antenna 11th

Interference Source Location Based on Spaceborne Multi-beam ...

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11th EAI International Conference on wireless and Satellite Systems, WiSATS 2020

作者： Ruan, Cen Zhao, Laiding Zhang, Gengxin Xie, Jidong Key Laboratory of Broadband Wireless Communication and Sensor Network Technology Nanjing University of Posts and Telecommunications Nanjing210003 China "Telecommunication and Network" National Engineering Research Center Nanjing University of Posts and Telecommunications Nanjing210003 China

ISBN: (纸本)9783030690687

Based on the frequency division multiplexing principle of the multi-beam antenna, this paper proposes a new method for locating interference sources by only one single satellite. According to the antenna pattern function expression of multi-beam antennas, the positioning equations are derived and established by analyzing the link that interfering signal arrives at the spaceborne multi-beam antenna from the ground. Importantly, the gain error is introduced in the positioning process when we evaluate the performance of this positioning method. Considering the difficulty of solving nonlinear positioning equations, a new algorithm combining the Particle Swarm Optimization (PSO) and grid search is proposed. At the same time, in this paper, in order to analyze the feasibility of this new algorithm, we introduce the Monte Carlo method in the process of this experiment. Finally, this new algorithm is compared with the traditional Particle Swarm Optimization in terms of speed and accuracy, which shows the superiority of this new algorithm. © 2021, ICST Institute for Computer Sciences, Social Informatics and Telecommunications Engineering.

关键词： Monte Carlo methods

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AN ID-based online/offline signature scheme without random oracles for wireless sensor networks

AN ID-based online/offline signature scheme without random o...

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作者： Wang, Zhiwei Chen, Wei College of Computer Nanjing University of Posts and Telecommunications Ministry of Education Jiangsu Province Nanjing 210003 Jiangsu China Jiangsu High Technology Research Key Laboratory for Wireless Sensor Networks Nanjing 210003 Jiangsu China Key Lab of Broadband Wireless Communication and Sensor Network Technology Ministry of Education Jiangsu Province Nanjing 210003 Jiangsu China

Online/offline signature schemes allow one to quickly compute a digital signature from a precomputed coupon. In this paper, we present an ID-based online/offline signature for wireless sensor networks (WSNs), which is based on Hohenberger' RSA signature (Crypto 09). We argue that due to significant reduction in costs of computation and storage, our scheme is particularly suitable for the WSNs environment with severely constrained resources. Our scheme can be proved secure under the factoring assumption without random oracles. © 2012 Springer-Verlag London Limited.

关键词： wireless sensor networks

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