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A free-rider forecasting model based on gray system theory in P2P networks

Research Journal of Applied Sciences, Engineering and technology 2012年第21期4卷 4423-4428页

作者： Xu, He Zhou, Zhao-Xiong Wang, Suo-Ping Wang, Ru-Chuan College of Computer Nanjing University of Posts and Telecommunications Nanjing 210003 China College of Automation Jiangsu Nanjing 210003 China Jiangsu High Technology Research Key Laboratory for Wireless Sensor Networks Jiangsu 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

The aim of this study is to forecast the number of free-riders in P2P networks which can help network managers to know the status of the networks in advance and take appropriate measures to cope with free-riding behavior. Free-riding behavior is common in P2P networks, which has a negative impact on the robustness, availability and stability of the networks. Severe free-riding behavior may lead to the crash of the whole P2P application system. Based on the research of free-riding behavior in P2P networks, this paper constructs a free-rider forecasting model (GST model) using Gray System Theory. Simulation experiments show that this model has high feasibility, and can carry out reasonable predictions on the number of free-riders in P2P networks. © Maxwell Scientific Organization, 2012.

关键词： Forecasting

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Research of new real-time trust monitoring model base on multiple behavior attributes

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Information technology Journal 2013年第18期12卷 4776-4782页

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

In order to ensure the reliability and security of working environments under the open network environment dynamically,a fine-grain real-time and dynamic trust monitoring model is proposed which is based on behavior attribute factor, penalty factor of bad frequency, penalty factor of reputation, penalty factor of hazard-warning frequency, union-recommendation trust, etc. Through monitoring the behavior change in the context of service nodes, the calculating method about the behavior risk value is discussed which is based on the degree of damage about bad behaviors. This can provide convenience for making new *** work is completed, the updating method about trust encouragement or punishment is given. Experiment results show that the new real-time trust monitoring model is accurate and effective. © 2013 Asian network for Scientific Information.

关键词： Dynamic trust Open network environment Trust monitoring Trust updating

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Experimental certification randomness of two bits based on elegant Bell inequality

Experimental certification randomness of two bits based on e...

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第十八届全国量子光学学术会议

作者：刘晨曦 Tong-Jun Liu Si Wang Xiao-Run Wang Jian Li Qin Wang 南京邮电大学 Institute of Quantum Information and Technology Nanjing University of Posts and Telecommunications Key Lab of Broadband Wireless Communication and Sensor Network Technology Nanjing University of Posts and TelecommunicationsMinistry of Education

Quantum random numbers are a fundamental resource to security and cryptography. Based on the intrinsically random processes, quantum random number generators（QRNGs） provides an opportunity to certify genuine random numbers. All implementations of QRNGs that invoke device-independent（DI）, the violation of Bell inequality are necessary to guarantee that the outcomes of the measurements cannot be determined in advance. For the single Clauser-Horne-Shimony-Holt（CHSH） inequality, it is not optimal with respect to randomness certification. Since local projective measurement are performed, one random bit can be certified from the maximally entangled two-qubit states. Recently, Andersson et al. [Phys. Rev. A 97, 012314（2018）] had proven that the device-independent certification can obtain two random bits through the maximum quantum violation of Gisin’s elegant Bell inequality. Here, we report a proof-of-principle realization of optimal randomness certification with practical photonic apparatus. In our experiment, we implement two kinds of qubit measurement, mutually unbiased bases（MUBs） and symmetric informationally complete positive operator-valued measures（SIC-POVM） of four-outcomes, respectively. Through randomness extractor, including Toeplitz-hashing extractor and an improved linear feedback shift register（LFSR）, we finally extracted random bit string which have good uniformity and pass all randomness tests of the NIST.

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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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Online video synopsis method through simple tube projection strategy

Online video synopsis method through simple tube projection ...

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International Conference on wireless communications and Signal Processing (WCSP)

作者： Jing Jin Feng Liu Zongliang Gan Ziguan Cui Jiangsu Province Key Lab on Image Processing & Image Communications Nanjing University of Posts and Telecommunications Nanjing China Key Lab of Broadband Wireless Communication and Sensor Network Technology Ministry of Education Nanjing University of Posts and Telecommunications Nanjing China

ISBN: (纸本)9781509028610

Traditional video synopsis methods model the processing into an optimization formula where relations among objects such as collision cost are utilized while entire re-calculation is introduced under each possible temporal shift. Unlike the pairwise cost optimization, we propose a low-complexity and efficient online synopsis method where each tube is processed independently. Without tubes' comparison, the rearrangement is accomplished by a simple projection strategy and an updating projection matrix which records the newest information of the moving space. Furthermore, buffer and a predefined fitness condition also help to increase spatial and temporal utilization. Experiment results demonstrate that the proposed method is superior to other synopsis methods in the processing speed and temporal consistency.

关键词： Streaming media Electron tubes Trajectory Optimization Surveillance Telecommunications Cameras

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Channel measurement and modeling for the 15-GHz radio band in an indoor corridor environment

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Journal of communications and Information networks 2017年第2期1卷 102-108页

作者： Hui Xu Wuxiong Zhang Yang Yang Key Lab of Wireless Sensor Network and Communication Chinese Academy of Sciences Shanghai China Shanghai Institute of Microsystem and Information Technology Chinese Academy of Sciences Shanghai China Shanghai Research Center for Wireless Communications Shanghai China

Traditional mobile communication systems mainly work on the licensed frequency band near or below 3 GHz; however, this band is becoming increasingly crowded. On the other hand, there are abundant unlicensed spectrum resources in higher frequency bands, e.g., 6 GHz, 15 GHz, and 28 GHz, and if those bands are applied, the current spectrum shortage problem could be effectively alleviated. However, the wireless channel characteristics and models are important but still unknown, and thus in this study, extensive measurements and modeling have been conducted to study the characteristics of the high-frequency 15-GHz band. Specifically, a PN(Pseudo Noise) sequence based time-domain measurement system was built and applied to measure the propagation characteristics of the LOS (Line-of-Sight) and NLOS (Non-Line-of-Sight) scenarios in an indoor corridor at 15 GHz. Then, in-depth analysis and modeling on the large-scale characteristics of wireless channels, the relationship between distance and path loss, the path loss exponent, and the shadow fading standard variance are provided. Moreover, the relationship between received power and different elevation angles was studied. In the measurement, two 25-dBi horn antennas with a 10 half-power beam width are used to change elevation angles in the transmitting terminal and azimuth angles in the receiving terminal for all measurement points. The findings and results in this work will serve as a reference and basis for future theoretical studies of the 15-GHz band.

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Device-independent quantum secure direct communication against collective attacks

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Science Bulletin 2020年第1期65卷 12-20,M0003页

作者： Lan Zhou Yu-Bo Sheng Gui-Lu Long School of Science 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 Institute of Quantum Information and Technology Nanjing University of Posts and TelecommunicationsNanjing 210003China State Key Laboratory of Low-dimensional Quantum Physics Beijing 100084China Department of Physics Tsinghua UniversityBeijing 100084China

"Device-independent"not only represents a relaxation of the security assumptions about the internal working of the quantum devices,but also can enhance the security of the quantum *** the paper,we put forward the first device-independent quantum secure direct communication(DIQSDC)protocol and analyze its security and communication efficiency against collective *** practical noisy quantum channel condition,the photon transmission loss and photon state decoherence would reduce DI-QSDC’s communication quality and threaten its absolute *** solving the photon transmission loss and decoherence problems,we adopt noiseless linear amplification(NLA)protocol and entanglement purification protocol(EPP)to modify the DI-QSDC *** the help of the NLA and EPP,we can guarantee DI-QSDC’s absolute security and effectively improve its communication quality.

关键词： Quantum cryptography Device-independent quantum secure direct communication Information security communication efficiency

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Intra/Inter-frame Joint WPP Coding Algorithm on Multicore Platform

Intra/Inter-frame Joint WPP Coding Algorithm on Multicore Pl...

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2018 3rd International Conference on Electrical, Automation and Mechanical Engineering(EAME 2018)

作者： Chuanwei Yin Dong Hu Tao Gu Education Ministry's Key Lab of Broadband Wireless Communication and Sensor Network Technology Education Ministry's Engineering Research Center of Ubiquitous Network and Heath Service Jiangsu Province's Key Lab of Image Procession and Image Communications Nanjing University of Posts and Telecommunications

Although wavefront parallel processing(WPP) proposed in the HEVC standard and various inter frame WPP algorithms can achieved comparatively high parallelism, their scalability for its parallelism is still very limited due to various dependencies introduced in spatial and temporal prediction in HEVC. In this paper, through pixel correlation analysis, establishment of CTU node model, multi-core resource allocation strategy, we proposed an intra/inter-frame joint WPP coding algorithm for multi-core platform which can significantly improve the parallelism, while achieved good results in bit rate, PSNR, and acceleration ratio. Experiments on standard HD test sequence show that the proposed algorithm can lead to up to 2x, 1.3x speed up compared with the original WPP and IWF parallelism.

关键词： video coding HEVC multicore platform high parallelism WPP

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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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A Novel Multi-level Wavelet Image Coding Algorithm by Full Sub-band Compressed Sensing

A Novel Multi-level Wavelet Image Coding Algorithm by Full S...

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2018 3rd International Conference on Electrical, Automation and Mechanical Engineering(EAME 2018)

作者： Weiping Qiu Dong Hu Yongyang He Education Ministry's Key Lab of Broadband Wireless Communication and Sensor Network Technology Education Ministry's Engineering Research Center of Ubiquitous Network and Heath Service Jiangsu Province's Key Lab of Image Procession and Image Communications Nanjing University of Posts and Telecommunications

The performance of wavelet transform based image compressed sensing coding algorithms severely rely on the level of wavelet transform. To this end, this paper investigated the combination of mutil-level wavelet full sub-band in compressed sensing framework. Firstly, we constructed a full sub-band coefficient sparse vector of mutil-level discrete wavelet transform. Secondly, we designed a weight matrix to improve measurement matrix. Finally, sparsity vector was processed by compressed sensing to get the measured value. Compared with the exiting algorithms, the experimental results of the proposed algorithm show that the PSNRs of reconstructed images is improve up to 1～2 dB under the same objective quality.

关键词： image coding wavelet transform compressed sensing full sub-band coefficient sparsity vector

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