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The Journal of China Universities of posts and telecommunications 2010年第2期17卷 85-91页

作者： HE Qian ,MENG Xiang-wu,SHANG Yan-lei,CHEN Jun-liang state key laboratory of networking and switching technology,beijing university of posts and telecommunications,beijing 100876,China [a] state key laboratory of networking switching technology Beijing University of Posts telecommunications Beijing 100876 China

This article proposes a cooperative relaying strategy to efficiently utilize the relaying resources of Interact service providers （ISPs）, speedup distribution and save server bandwidth costs. ISPs cooperatively relay for each other, and peers assist in distributing and fetching the content as near as possible. Base on the fluid model, a constrained model is derived to get optimized global distribution performance in the channel-based system with limited relaying resources. The multi-objectives of the model are minimizing the average distribution time and the distribution time of the slowest channel. Genetic algorithm （GA） is designed to solve the optimization problem. The relaying strategy based on GA can be run periodically to update the allocation policy of ISPs. The distribution performance of the relaying strategy is analyzed in the experiments and results show that GA can provide proper solutions for various network topologies.

关键词： content distribution peer-to-peer genetic algorithm cooperative relaying resource allocation

Lightweight SOA-Based Twin-Engine Architecture for Enterprise Systems in Fixed and Mobile Environments

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China Communications 2016年第9期13卷 183-194页

作者： Tongguang Zhang Shuai Zhao Budan wu Maurizio Farina Bo Cheng Junliang Chen state key laboratory of networking and switching technology Beijing University of Posts and TelecommunicationsBeijing 100876China Adaptive Software Company Via Posillipo 255Naples 80123Italy

Mobile devices as a popular computing platform for enterprise systems have enabled certain tasks to be executed out of ***,the work may be interrupted due to the server shutdown or network disconnection when employees access traditional single-engine Business Process Management *** overcome this defect,we present a lightweight twin-engine architecture based on Service Oriented Architecture(SOA).In this paper,we discuss in detail the design and implementation of the architecture,and present a trigger mechanism to activate engines according to the states of hybrid environments since it is critical for the two types of engines to cooperate closely in hybrid environments with fixed and mobile computing *** experimental results validate the usability of the architecture.

关键词： twin-engine SOA enterprise system mobile environment

Topology Based Reliable Virtual Network Embedding from a QoE Perspective

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China Communications 2018年第10期15卷 38-50页

作者： Peiying Zhang Sheng wu Miao Wang Haipeng Yao Yunjie Liu College of Computer & Communication Engineering China University of Petroleum (East China) state key laboratory of networking and switching technology Beijing University of Posts and Telecommunications DFH Satellite Co. Ltd.

In the network virtualization environments, one of the most challenges is how to map the virtual networks(VNs) onto a shared substrate network managed by an infrastructure provider(In P), which is termed as virtual network embedding problem. Prior studies on this issue only emphasize on maximizing the revenue or minimizing the energy consumption while ignoring the reliability requirements of end-users. In our work, we incorporate the reliability probability into the virtual network embedding process with an aim to improve the Qo S/Qo E of end users from a new perspective. We devised two novel reliable virtual network embedding algorithms called RRW-Max Match and RDCC-VNE based on RW-Max Match and DCC-VNE, respectively. Extensive simulations demonstrated that the efficiency of our proposed algorithms is better than those of two primitive algorithms in terms of the reliability demands, the acceptance ratio of virtual networks and the long-term average revenue.

关键词： virtual network embedding reliability probability node mapping procedure link mapping procedure node ranking metric

A NEW DYNAMIC QUOTA-BASED ADMISSION CONTROL WITH SUB-NEGOTIATION FOR SOFTSWITCH-BASED CLUSTERED MEDIA SERVER

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Journal of Electronics(China) 2006年第5期23卷 675-682页

作者： wu Naixing Liao Jianxin Zhu Xiaomin state key Lab of networking and switching Beijing University of Posts and Telecommunications Beijing 100876 China

Based on the demand of the admission control of softswitch-based clustered media server, this pa- per proposed a new dynamic quota-based admission control algorithm that has a sub-negotiation process. The strongpoint of quota-based algorithm had been inherited in the algorithm and at the same time some new ideas had also been introduced into it. Simulations of the algorithm had been conducted on the Petri net model and the results show that this algorithm has excellent performance. In order to find the optimal resource quota set- ting in real time, the paper proposed two approximation analysis methods. It can be seen from analysis results that these two methods can be used to get sub-optimal quota values quickly and effectively. These two ap- proximation analysis methods will play important roles in implementation of the algorithm in system.

关键词： Admission control algorithm Clustered media server NGN (Next Generation Network) Stochastic Petri net

A LIMITED RESOURCE VECTOR LOAD-BALANCING ALGORITHM FOR SOFTSWITCH-BASED HETEROGENEOUS CLUSTERED MEDIA SERVER

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Journal of Electronics(China) 2006年第5期23卷 683-690页

作者： wu Naixing Liao Jianxin Zhu Xiaomin state key Lab of networking and switching Beijing University of Posts and Telecommunications Beijing 100876 China

Based on the system feature of softswitch-based heterogeneous clustered media server, this paper proposed a limited resource vector load-balancing algorithm. The purpose of the algorithm was to balance the load of clusters by utilizing all system resources effectively and to avoid violent shaking of the system per- formance. A lot of simulations on the Petri net model of load balance system are conducted and the algorithm is compared with some traditional algorithms on balancing ability for heterogeneity, system throughput, re- quest response time and performance stability. The results of simulations show that the algorithm achieves system higher performance and it has excellent ability to deal with the heterogeneity of clustered media server.

关键词： Load-balancing algorithm Heterogeneous cluster Media server Softswitch SPN (Stochastic Petri Net)

A quantum federated learning framework for classical clients

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Science China(Physics,Mechanics & Astronomy) 2024年第5期67卷 1-10页

作者： Yanqi Song Yusen wu Shengyao wu Dandan Li Qiaoyan Wen Sujuan Qin Fei Gao state key laboratory of networking and switching technology Beijing University of Posts and TelecommunicationsBeijing 00876China Department of Physics The University of Western AustraliaPerthWA 6009Australia School of Computer Science(National Pilot Software Engineering School) Beijing University of Posts and TelecommunicationsBeijing100876China

Quantum federated learning(QFL)enables collaborative training of a quantum machine learning(QML)model among multiple clients possessing quantum computing capabilities,without the need to share their respective local ***,the limited availability of quantum computing resources poses a challenge for each client to acquire quantum computing *** raises a natural question:Can quantum computing capabilities be deployed on the server instead?In this paper,we propose a QFL framework specifically designed for classical clients,referred to as CC-QFL,in response to this *** each iteration,the collaborative training of the QML model is assisted by the shadow tomography technique,eliminating the need for quantum computing capabilities of ***,the server constructs a classical representation of the QML model and transmits it to the *** clients encode their local data onto observables and use this classical representation to calculate local *** local gradients are then utilized to update the parameters of the QML *** evaluate the effectiveness of our framework through extensive numerical simulations using handwritten digit images from the MNIST *** framework provides valuable insights into QFL,particularly in scenarios where quantum computing resources are scarce.

关键词： client server quantum

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下一代网络中AAA服务器关键技术研究

计算机工程与应用 2004年第32期40卷 11-13页

作者：马旭涛朱晓民吴乃星廖建新北京邮电大学网络与交换国家重点实验室北京100876

研究在下一代网络中用于实现认证、授权、计费功能的AAA(Authentication,AuthorizationandAccounting)服务器所涉及的关键技术。在实现了AAA服务器的基础上讨论了AAA服务器的体系结构、前后台自适应负荷均衡机制、前台服务器中请求队列... 详细信息

研究在下一代网络中用于实现认证、授权、计费功能的AAA(Authentication,AuthorizationandAccounting)服务器所涉及的关键技术。在实现了AAA服务器的基础上讨论了AAA服务器的体系结构、前后台自适应负荷均衡机制、前台服务器中请求队列的入队和出队操作,以及在后台服务器中基于队列优先级的分时片调度机制。

关键词：下一代网络 AAA服务器认证计费

Multifunctional MXene/rGO aerogels loaded with Co/MnO nanocomposites for enhanced electromagnetic wave absorption,thermal insulation and pressure sensing

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Nano Research 2024年第9期17卷 7803-7813页

作者： Chan Guo Shiping Shao Xin Zhang Yunxiang Tang Luxue Wang Jiurong Liu Lili wu Ke Bi Fenglong Wang key laboratory for Liquid-Solid Structural Evolution and Processing of Materials Ministry of Education Shandong UniversityJinan 250061China state key laboratory of Information Photonics and Optical Communications School of ScienceBeijing University of Posts and TelecommunicationsBeijing 100876China

Aerogel-based composites hold promising application prospects as potential electromagnetic wave(EMW)absorption materials,yet the construction of such materials with ingenious microstructures,appropriate magnetic/dielectric multi-components,and integrated multifunctionality remains considerably ***,a multicomponent Co/MnO/Ti_(3)C_(2)T_(x) MXene/rGO(CMMG)hybrid aerogel featured with three-dimensional(3D)vertical directional channel architecture is *** from the synergistic effect arising from the 3D conductive networking structure,diverse heterogeneous interfaces,magnetic/dielectric multicomponent,and multiple loss pathways,the optimized CMMG-2 aerogel delivers fascinating EMW absorption capabilities,characterized by a minimal reflection loss(RL_(min))of-77.41 dB and an effective absorption bandwidth(EAB)of 6.56 ***,the remarkable hydrophobicity,exceptional thermal insulation capabilities,and outstanding photothermal properties of CMMG-2 aerogel make it highly promising for multiple application in diverse and demanding ***,the distinctive pore structure of hybrid aerogel also allows it for sensitive and reliable detection of electrical signals caused by pressure changes and human ***,this research provides a viable design strategy for the development of lightweight,efficient,and multifunctional aerogel-based EMW absorption materials for various application scenarios.

关键词： electromagnetic wave absorption Ti_(3)C_(2)qT_(x)MXene reduced graphene oxide magnetic-dielectric nanoparticles multifunctional aerogel

Privacy-Preserving Decision Protocols Based on Quantum Oblivious key Distribution

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Computers, Materials & Continua 2020年第9期64卷 1915-1928页

作者： Kejia Zhang chunguang Ma Zhiwei Sun Xue Zhang Baomin Zhou Yukun Wang School of Computer Science and technology Harbin Engineering UniversityHarbin150001China School of Mathematical Science Heilongjiang UniversityHarbin150080China state key laboratory of networking and switching technology Beijing University of Posts and TelecommunicationsBeijing100876China Center for Quantum Computing Peng Cheng LaboratoryShenzhen518055China College of Computer Science and Engineering Shandong University of Science and TechnologyQingdao266590China School of Artificial Intelligence Shenzhen PolytechnicShenzhen518055China Department of Electrical and Computer Engineering National University of Singapore117583Singapore

Oblivious key transfer(OKT)is a fundamental problem in the field of secure multi-party *** makes the provider send a secret key sequence to the user obliviously,i.e.,the user may only get almost one bit key in the sequence which is unknown to the ***,a number of works have sought to establish the corresponding quantum oblivious key transfer model and rename it as quantum oblivious key distribution(QOKD)from the well-known expression of quantum key distribution(QKD).In this paper,a new QOKD model is firstly proposed for the provider and user with limited quantum capabilities,where both of them just perform computational basis measurement for single *** we show that the privacy for both of them can be protected,since the probability of getting other’s raw-key bits without being detected is exponentially ***,we give the solutions to some special decision problems such as set-member decision and point-inclusion by announcing the improved shifting strategies followed ***,the further discussions and applications of our ideas have been presented.

关键词： Quantum cryptography quantum computing privacy-preserving quantum oblivious key distribution set-member decision point-inclusion decision