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Design of Efficient MDI Testing System

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Design of Efficient MDI Testing System

2010 Second International Conference on Communication Systems, Networks and Applications (ICCSNA 2010)

作者： Zujin Bai Zhengzhou university of Light Industry Zhengzhou china Junfei Huang state Key Laboratory of {3. and switching technology beijing university of posts and telecommunications beijing china

The MDI（Media Delivery Index） can indicate the instantaneous and longer-term *** design of an efficient MDI testing system which can support different network interfaces is *** class diagrams and the algorithms are *** alarm module is introduced in the system that will help to let administrators to know network problem *** experience of an internal streaming service deployed in campus network shows the correctness and validity of the system design.

关键词： Media Straming MDI DF MLR

A Novel IP Traceback Approach with Self-Adaptive Probabilistic Packet Marking

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A Novel IP Traceback Approach with Self-Adaptive Probabilist...

2011 IEEE International Conference on Information Theory and Information Security(ICITIS 2011)

作者： Dong Yan Yulong Wang Sen Su Fangchun Yang state Key Laboratory of networking and switching {3. beijing university of posts and telecommunications beijing china

IP traceback is an important step to defend the Internet against Denial of Service （DoS） *** packet marking is considered to be a promising approach to realize IP traceback with little *** this paper,we propose a novel and practical IP traceback approach with self-adaptive probabilistic packet marking called SAPPM,which can reconstruct the attack path with fewer packets and incur less impact to the performance of network and routers through the traceback *** particular,SAPPM includes two *** the first stage,it adopts a flexible marking scheme according to the router location in the transmission path,which can reconstruct the complete path with fewer *** the second stage,marking rate is adjusted to the change of some key indicators of routers,which can make routers avoid becoming *** on simulation demonstrate the feasibility and effectiveness of SAPPM in these fields.

关键词： Denial of Service (DoS) IP traceback probabilistic packet marking cyber security

Channel Adaptive Shortest Path Routing for Ad Hoc Networks

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The Journal of china Universities of posts and tele{3. 2003年第3期10卷 1-5页

作者： TIAN Hui, XIE Fang, HU Jian dong, ZHANG Ping (Wireless technology Innovation Labs, beijing university of {3. & telecommunications, beijing 100876, P. R. china) Wireless technology Innovation Labs Beijing University of Posts & Telecommunications 北京 100876

Routing in Mobile Ad Hoc Network (MANET) is a challenge owing to the dynamicnature of network topology and the resource constraints. To maximize the channel resourceutilization and minimize the network transfer delay along the path, the shortest path with theminimum hops approach is often adopted. However, the quality of wireless channels among the mobilenodes is time varying owing to fading, shadowing and path loss. Considering adaptive channel codingand modulation scheme, the channel state can be characterized by different link throughputs . Ifrouting selection based on the link throughput is implemented, the minimum transfer delay fromsource to destination and the. maximal throughput may be obtained. In this paper, a Channel AdaptiveShortest Path Routing (CASPR) is presented. Based on the adaptive channel coding and modulation,the CASPR transforms the link throughput into the channel quality factor Q and finds the shortestrouting according to the Q measure. Simulation results show that the average path length in theproposed routing scheme may be slightly higher than that of the conventional shortest path with theminimum hops approach, but it can reduce the average transfer delay and increase the packet deliverrate.

关键词： wireless networks ad hoc networks routing

Charge-Based Low Priority Congestion Control

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Charge-Based Low Priority Congestion Control

2008 11th IEEE International Conference on Communication technology(ICCT2008)

作者： Chi WANG Hongbo Wang Yu Lin and Shanzhi Chen Chunguang Wu state Key laboratory of networking and switching {3. beijing university of posts and telecommunications beijing 100876 china Dalian university of {3. Dalian 116024 Liaoning china

With the best-effort TCP transporting foreground traffic,below-best-effort transport protocols are developed to transport background ***,we argue in this paper that:1) two fixed levels of priority are not enough,and 2) the background and foreground transfers are subjective concepts which can only be decided by users but not arbitrarily determined by the network according to the application type of the *** we propose the charge-based low priority congestion control（TCP-CBLP）,an algorithm not only provide multiple flexible priority levels lower than best-effort TCP,but also helps users allocating their available bandwidths effectively to optimize their *** results show that the algorithm is fair,stable,and can optimize users’ utilities.

关键词： congestion control low priority congestion pricing background traffic utility function

支持时空约束的可信数字版权管理安全许可协议

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通信学报 2008年第10期29卷 153-164页

作者：马兆丰范科峰陈铭杨义先钮心忻北京邮电大学灾备技术国家工程实验室北京邮电大学信息安全中心中国电子技术标准化研究所国家数字音视频及多媒体产品质检中心

提出一种新的支持时空约束的数字版权管理安全许可协议(CPSec DRM),该协议将内容对象与版权对象相分离,通过内容加密密钥CEK保护数字内容本身,而通过与客户设备信息相关的设备密钥DEK保护每一份许可证。在用户与许可证中心之间采用动态... 详细信息

提出一种新的支持时空约束的数字版权管理安全许可协议(CPSec DRM),该协议将内容对象与版权对象相分离,通过内容加密密钥CEK保护数字内容本身,而通过与客户设备信息相关的设备密钥DEK保护每一份许可证。在用户与许可证中心之间采用动态实时密钥协商算法实现双向认证和动态许可申请,通过'时间、空间空约束相关联'、'终端、许可服务器相认证'、'许可证书实时动态生成与发布'机制实现许可证的可区分安全管理。考虑到离线版权安全许可,本协议中引入了许可证转换器的概念,通过许可倒计数机制实现为特定数量用户可按在线、离线模式进行版权二次分发。所提协议CPSec DRM支持在线、离线两种版权许可模式,用户在获得域许可证后,无需依赖原来的许可证中心即可完成版权的二次分发(包括在线和离线)。分析表明所提协议在内容保护、安全认证、许可授权和应用模式等方面满足DRM内容保护要求和目标。

关键词：数字版权管理安全协议许可证书有限分发

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IPTV关键技术分析及前景展望

china communications 2009年第2期6卷 47-50,83-87页

作者：王洪波程时端北京邮电大学网络与交换技术国家重点实验室

本文介绍了IPTV的基本概念、特点以及IPTV中的关键技术,基于IMS的IPTV系统架构以及Internet TV。阐述了IPTV中QoS和QoE以及二者的联系与区别,分析了IPTV发展中面临的技术挑战。最后,总结了IPTV在中国的发展现状,并对其发展前景进行了展望。

关键词： IPTV IMS P2P QoSI OoE

CYCLIC REDUNDANCY CODE CHECK ALGORITHM BASED ON SMALL LOOKUP TABLE

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CYCLIC REDUNDANCY CODE CHECK ALGORITHM BASED ON SMALL LOOKUP...

2009 IEEE International Conference on Communication technology and Applications（ICCTA2009）

作者： Jianfen Peng~(1 2 3. Yajian Zhou~(1 2 3. Yixian Yang~(1 2 3. 1National Engineering Laboratory for Disaster Backup and Recovery beijing university of posts and {3.communications 2Information Security Center state Key Laboratory of networking and switching technology beijing university of posts and {3.communications 3.ey Laboratory of network and information attack & defence technology of MOE beijing university of posts and {3.communications

＜正＞Real time and low occupation of memory must be satisfied in the error controlling of computer *** redundancy code Generation algorithm based on small lookup table（CRCGA） is presented in this paper,which is based on "slicing-by -4" algorithm proposed by *** ***. and uses the distributive property of mod function in modulo-2 arithmetic to reduce the size of cache demanded by the algorithm by *** reads 3.bits at a time,only needs 2-KByte cache *** results show that CRCGA can be applied to small control equipment in distributed control system.

关键词： algorithms cyclic redundancy codes precomputation lookup table

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隐私保护的自适应垃圾邮件过滤方法研究

通信学报 2009年第S1期30卷 145-149页

作者：杨震范科峰雷建军北京工业大学计算机学院北京100124 北京邮电大学网络与交换国家重点实验室信息安全中心北京100876 天津大学电子信息工程学院天津300072

在文本信息处理领域,随着信息网络化的发展使得获取海量的文本训练集不再困难。但在合理利用这些文本训练集进行数据挖掘的同时,必然遭遇到隐私保护方面的诸多问题,特别是针对涉及用户隐私的文本数据所进行的挖掘。针对垃圾邮件过滤中... 详细信息

在文本信息处理领域,随着信息网络化的发展使得获取海量的文本训练集不再困难。但在合理利用这些文本训练集进行数据挖掘的同时,必然遭遇到隐私保护方面的诸多问题,特别是针对涉及用户隐私的文本数据所进行的挖掘。针对垃圾邮件过滤中隐私保护问题进行了研究,在给出了基于隐私保护的自适应垃圾邮件过滤模型的基础上,讨论了一种基于简单散列变化的隐私数据保护方法,并给出了一种改进的数据部分属性隐藏的隐私数据保护方法。分析和实验结果表明,改进方法能够有效地解决在线自适应垃圾邮件过滤中隐私保护的问题。

关键词：隐私保护数据挖掘朴素贝叶斯分类垃圾邮件过滤特征重构

Decentralized Control of Dynamic Routing with a Neural Network Algorithm

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The Journal of china Universities of posts and tele{3. 2000年第1期7卷 46-50页

作者： XIN Zhan-hong, FANG Mei-qin (School of Management and Humanities, beijing university of posts and {3.communications, beijing 100876, P. R. china) School of Management and Humanities Beijing University of Posts and Telecommunications Beijing 100876 P. R. China

A state-dependent routing algorithm based on the neural network model, which takes advantage of other dynamic routing algorithm for circuit-switched network, is given in [1]. But, the Algorithm in [1] is a centralized control model with complex O (N 7), therefore, is difficult to realize by hardware. A simplified algorithm is put forward in this paper, in which routing can be controlled decentralizedly, and its complexity is reduced to O (10N 3.. Computer simulations are made in a fully connected test network with eight nodes. The results show that the centralized control model has very effective performance that can match RTNR, and the centralized control model is not as good as the centralized one but better than DAR-1.

关键词： neural network circuit-switched network dynamic routing decentralized control