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A Summary of the Large-Scale Access Convergence network Structure

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China Communications 2016年第S1期13卷 1-5页

作者： LAN Julong ZHANG Xiaohui SHEN Juan HU Yuxiang WANG Xiang MAO Zhenshan WANG Lingqiang LIANG Dong national Digital Switching System Engineering & Technological Research Center Zhongxing Telecommunication Equipment Corporation Henan Cable TV network Group Co. Ltd

Under the requirement of everything over IP, network service shows the following characteristics:(1) network service increases its richness;(2) broadband streaming media becomes the mainstream. To achieve unified multi-service bearing in the IP network, the largescale access convergence network architecture is proposed. This flat access convergence structure with ultra-small hops, which shortens the service transmission path, reduces the complexity of the edge of the network, and achieves IP strong waist model with the integration of computation, storage and transmission. The key technologies are also introduced in this paper, including endto-end performance guarantee for real time interactive services, fog storing mechanism, and built-in safety transmission with integration of aggregation and control.

关键词： network architecture large-scale access convergence flat structure ultra-small hops

Cryptanalysis and improvement of a quantum secret sharing scheme based on χ-type entangled states

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Chinese Physics B 2012年第1期21卷 1-5页

作者： Zhu zhen-Chao Zhang Yu-Qing Fu An-Min Information Security Research Center Southeast UniversityNanjing 210096China national Computer network Intrusion Protection Center Graduate University of Chinese Academy of SciencesBeijing 100049China

In the paper [2010 Chin. Phys. B 19 050306], Yang et al. put forward a novel three-party quantum secret sharing protocol of secure direct communication based on x-type entangled states, they claimed that the scheme is secure. However, in this paper, we study the security of the protocol and find that it is insecure. Applying intercept and resend attack, the agent Bob can obtain Alice＇s secret without the help from the other agent Charlie. In the end, we give our effective modification for its improvement.

关键词： quantum secret sharing quantum entanglement bell state nonorthogonal base

Switchable down-,up-and dual-chirped microwave waveform generation with improved time–bandwidth product based on polarization modulation and phase encoding

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Chinese Physics B 2022年第7期31卷 620-628页

作者： Yuxiao Guo Muguang Wang Hongqian Mu Guofang Fan Institute of Lightwave Technology Key Laboratory of All Optical Network and Advanced Telecommunication NetworkMinistry of EducationBeijing Jiaotong UniversityBeijing 100044China

A switchable down-,up-and dual-chirped microwave waveform generation technique with improved time–bandwidth product(TBWP)is proposed and demonstrated based on a dual-polarization dual-parallel Mach–Zehnder modulator(DPDPMZM)cascaded with a polarization modulator(Pol M).By properly controlling the phase shifts of the radio frequency signals applied to the DP-DPMZM,switchable down-,up-and dual-chirped waveforms with simultaneous frequency and bandwidth doubling can be *** enlarge the TBWP further,splitting parabolic signal and phase-encoding splitting parabolic signal are used to drive the Pol M for the enhancement of bandwidth and time *** results demonstrate the generation of down-,up-and dual-chirped microwave waveform with TBWP of 8,160 and *** proposed method may find applications in future multifunction radar systems due to the high performance and flexibility.

关键词： microwave photonics linearly chirped waveform generation time–bandwidth product

Deep Scattering Spectra with Deep Neural networks for Acoustic Scene Classification Tasks

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Chinese Journal of Electronics 2019年第6期28卷 1177-1183页

作者： ZHANG Pengyuan CHEN Hangting BAI Haichuan YUAN Qingsheng Key Laboratory of Speech Acoustics and Content Understanding Institute of Acoustics Chinese Academy of Sciences University of Chinese Academy of Sciences national Computer network Emergency Response Technical Team/Coordination Center of China

As one of the most commonly used features, Mel-frequency cepstral coefficients(MFCCs) are less discriminative at high frequency. A novel technique,known as Deep scattering spectrum(DSS), addresses this issue and looks to preserve greater details. DSS feature has shown promise both on classification and recognition tasks. In this paper, we extend the use of DSS feature for acoustic scene classification task. Results on Detection and classification of acoustic scenes and events(DCASE) 2016 and 2017 show that DSS provided 4.8% and 17.4% relative improvements in accuracy over MFCC features, within a state-of-the-art time delay neural network framework.

关键词： Acoustic scene classification Time-delay neural network Deep scattering spectrum Detection and classification of acoustic scenes and events(DCASE)

Efficient network immunization under limited knowledge

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national Science Review 2021年第1期8卷 127-134页

作者： Yangyang Liu Hillel Sanhedrai Gao Gao Dong Louis M.Shekhtman Fan Wang Sergey V.Buldyrev Shlomo Havlin Department of Systems Science National University of Defense Technology Department of Physics Bar-Ilan University Faculty of Science Jiangsu University network Science Institute Northeastern University Department of Physics Yeshiva University

Targeted immunization of centralized nodes in large-scale networks has attracted significant ***, in real-world scenarios, knowledge and observations of the network may be limited, thereby precluding a full assessment of the optimal nodes to immunize（or quarantine） in order to avoid epidemic spreading such as that of the current coronavirus disease（COVID-19） epidemic. Here, we study a novel immunization strategy where only n nodes are observed at a time and the most central among these n nodes is immunized. This process can globally immunize a network. We find that even for small n（≈10） there is significant improvement in the immunization（quarantine）, which is very close to the levels of immunization with full knowledge. We develop an analytical framework for our method and determine the critical percolation threshold p;and the size of the giant component P∞ for networks with arbitrary degree distributions P（k）. In the limit of n →∞ we recover prior work on targeted immunization, whereas for n = 1 we recover the known case of random immunization. Between these two extremes, we observe that, as n increases,p;increases quickly towards its optimal value under targeted immunization with complete information. In particular, we find a new general scaling relationship between |p;（∞）-p;（n）| and n as |p;（∞）-p;（n）| ～n;exp（-αn）. For scale-free（SF） networks, where P（k）～ k;, 2 network). Thus, for SF networks, having knowledge of ≈log N nodes and immunizing the most optimal among them can dramatically reduce epidemic spreading. We also demonstrate our limited knowledge immunization strategy on several real-world networks and confirm that in these real networks, p;increases significantly even for small n.

关键词： percolation complex networks network immunization critical phenomena

CLORKE-SFS:Certificateless One-Round Key Exchange Protocol with Strong Forward Security in Limited Communication Scenarios

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China Communications 2021年第7期18卷 211-222页

作者： Xiaowei Li Dengqi Yang Benhui Chen Yuqing Zhang Department of Mathematics and Computer Science Dali UniversityDali 671003China national Computer network Intrusion Protection Center University of the Chinese Academy of SciencesBeijing 100049China

Certificateless one-round key exchange(CL-ORKE)protocols enable each participant to share a common key with only one round of communication which greatly saves communication *** protocols can be applied to scenarios with limited communication,such as space *** CL-ORKE protocols have been researched for years,lots of them only consider what secrets can be compromised but ignore the time when the secrets have been *** CL-ORKE protocols,the reveal of the long-term key attacks can be divided into two different attacks according to the time of the long-term key revealed:the attack to weak Forward Security(wFS)and the attack to strong Forward Security(sFS).Many CLKE protocols did not take into account the sFS property or considered sFS as *** this paper,we first propose a new security model for CL-ORKE protocols which considers the sFS property as well as the Ephemeral Key Reveal ***,we give a CL-ORKE protocol which is called ***-SFS is provably secure under the proposed model provided the Elliptic Curve Computational Diffie-Hellman(ECCDH)and the Bilinear Computational Diffie-Hellman problem(BCDH)assumption *** security model and the protocol may give inspiration for constructing oneround key exchange protocols with perfect forward security in certificateless scenarios.

关键词： key exchange protocol strong forward security one-round certificateless

Intelligent outdoor video advertisement recommendation system based on analysis of audiences' characteristics

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High Technology Letters 2016年第2期22卷 215-223页

作者：刘鹏 Li Songbin Deng Haojiang Wang Jinlin Haikou Laboratory Institute of AcousticsChinese Academy of Sciences national network New Media Engineering Research Center Institute of AcousticsChinese Academy of Sciences

An integrated implementation framework of an intelligent recommendation system for outdoor video advertising is proposed, which is based on the analysis of audiences＇ characteristics. Firstly, the images of the scene and the people who view the video advertisements are captured by the net- work camera deployed on the video advertising terminal side. Then audiences＇ characteristics can be obtained by applying computer vision technologies ： face detection, face tracking, gender recogni- tion and age estimation. Finally, an intelligent recommendation algorithm is designed to decide the most fitting video ads for each terminal according to multi-dimensional statistical information of its reover, a novel face detection method and a new face tracking method have been proposed to meet the practical requirements of the system, of which the average Fl-score is O. 988 and 0. 951 respec- tively.

关键词： face detection face tracking intelligent recommendation system outdoor videoadvertisement

Detecting DNS Covert Channels Using Stacking Model

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China Communications 2020年第10期17卷 183-194页

作者： Peng Yang Ye Li Yunze Zang national Computer network Emergency Response Technical Team/Coordination Center of China Beijing 100029China Institute of Information Engineering Chinese Academy of SciencesBeijing 100093China

A covert channel is an information channel that is used by the computer process to exfiltrate data through bypassing security *** DNS protocol is one of the important ways to implement a covert *** covert channels are easily used by attackers for malicious ***,an effective detection approach of the DNS covert channels is significant for computer systems and network *** at the difficulty of the DNS covert channel identification,we propose a DNS covert channel detection method based on a stacking *** stacking model is evaluated on a campus network and the experimental results show that the detection based on the stacking model can detect the DNS covert channels ***,it can identify unknown covert channel *** area under the curve(AUC)of the proposed method reaches 0.9901,which outperforms existing detection methods.

关键词： DNS covert channel stacking model

Asymptotic Analysis and Precoding Design of Integrated Access and Backhaul in Full-Duplex mmWave networks

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China Communications 2022年第5期19卷 24-45页

作者： Yi Zhang Shuai Han Weixiao Meng Xunan Li Yue Chen Communications Research Center Harbin Institute of TechnologyHarbin 150001China national Computer network Emergency Response Technical Team/Coordination Center of China Beijing 100000China

In this paper,we consider a full-duplex(FD)millimeter wave(mmWave)multiuser integrated access and backhaul(IAB)system with massive MIMO,and the system asymptotic performance and interference cancellation schemes are ***,the asymptotic performance of the IAB system with massive MIMO is *** the number of macro base station(MBS)and small base station(SBS)antennas approaches infinity,the FD selfinterference(SI),inter-tier interference and noise can be eliminated,which means that only multiuser interference remains in the ***,multiuser interference can be suppressed by the base band(BB)*** all interference and noise are suppressed,the spectral efficiency of the SBS and users are infinite in ***,two interference suppression precoding schemes are proposed.A block diagonalization(BD)-based interference cancellation scheme is designed based on the channel characteristics and null space *** FD SI,intertier interference and multiuser interference are eliminated by BB *** of eliminating interference completely,a signal to leakage and noise ratio(SLNR)-based precoding scheme is derived to suppress both interference and *** utilizing the Rayleigh-Ritz theorem,the SLNRs of the SBS and users are *** results show that all the interference can be effectively eliminated by the BD-based scheme at the cost of spectral efficiency performance loss,while the SLNR-based scheme can balance interference and noise and achieve higher spectral efficiency with comparatively low interference ***,the BD-based scheme is more suitable for interference elimination cases,and the SLNRbased scheme can improve the system performance in low interference scenarios.

关键词： millimeter wave full duplex integrated access and backhaul precoding