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Formation and causes of NOx pollution on the east side of the Taihang Mountains in china

Science Bulletin 2011年第19期 2046-2051页

作者： TIAN HeZhong 1 , WANG Yan 1 , ZHAO Dan 1 , CHAI FaHe 2., XING ZiShan 3 & CHENG Ke 1 1 state key Joint {2. of Environmental Simulation & Pollution Control, School of Environment, beijing Normal University, beijing 100875, china 2.Chinese Research Academy of Environmental Sciences, beijing 100012. china 3 School of Computer Science and technology, beijing University of posts and telecommunications, {12., china

Tropospheric column amounts of NO 2.from OMI/Aura products were applied to investigate the seasonal variation of NO x on the east side of the Taihang Mountains (ESTM) in china. The NO 2.concentration varied seasonally, with winter maxima and summer minima. To explore the causes of the heavy NO 2.pollution in this region, wind field simulations were conducted by using the Fifth-Generation NCAR/Penn state Mesoscale Model (MM5). MM5 simulations showed that wind directions in the ESTM region were dominated by northeasterly and northwesterly winds throughout the year and to a lesser degree by southwesterlies. Elevated NO 2.concentrations (higher than 50×10 15 molec/cm 2.) occurred in three meteorological situations: convergent wind fields (5 days), northeasterly winds (2.days), and calm days (1 day) in January. Although the local anthropogenic NO x emission strength was not so high as that in other developed areas, the calms and frequent occurrence of convergent wind fields, as well as unfavorable terrains for diffusion, resulted in the accumulation of atmospheric pollutants and hence heavy NO x pollution. Furthermore, long-distance NO x transportation from the {2.-Tianjin-Tangshan region to the ESTM area could be seen when the wind was from a northeasterly direction, especially under high wind speeds.

关键词： east side of the Taihang Mountains (ESTM) remote sensing of air pollution satellite data tropospheric NO 2 pollution wind field china

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An Efficient Scheme of Authenticated Encryption with Associated Data

An Efficient Scheme of Authenticated Encryption with Associa...

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2.10 Chinese Control and Decision Conference

作者： Shaolan Zhang~(1,2. Guobo Xing~2.Yixian Yang~1 1.Information Security Center,state key {2. of networking and switching technology,beijing University of posts and telecommunications beijing 100876 2.School of Computer Science & technology,Shandong Jianzhu University,Shandong Jinan 2.0101

＜正＞An efficient scheme of authenticated encryption with associated data is provided by combining a collision resistant hash function with an authenticated encryption *** hash function is used to compress an arbitrary length header to a fixed length *** authenticated encryption scheme is the improvement of OCB mode of *** is believed to provide extremely high protection with encryption and message authentication in a most efficient ***,when OCB mode of operation is used to handle large amount of data,it is easy to find collision so that the mode will lose the authenticity capability with probability *** improved scheme on the checksum is proposed to avoid the existing collision attacks *** random element without additional complicated calculation is introduced to translate the segment plaintexts in the *** last,the security of the scheme of authenticated encryption with associated data is analyzed.

关键词： Block Cipher Collision Resistant Hash Function Collision attack Authenticated Encryption Mode Authenticated Encryption with Associated Data

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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 {2. 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)

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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 {2. 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

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IN/CORBA网关中的协议映射研究

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计算机工程与应用 2003年第31期39卷 11-13,40页

作者：胡晓娟苏森北京邮电大学程控交换技术与通信网国家重点实验室北京100876

文章首先对CORBA(CommonObjectRequestBrokerArchitecture)平台上分布式智能网IN(IntelligentNet-work)的基本体系结构及IN/CORBA网关在此体系结构中的位置及作用进行了介绍,之后在此基础上着重研究了IN/CORBA协作网关中协议映射的有关... 详细信息

关键词：智能网协议映射CORBA INAP IDL ASN.1

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移动智能网多媒体消息业务的体系结构及其协议

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通信学报 2004年第9期25卷 78-85页

作者：张磊廖建新陈俊亮北京邮电大学网络与交换国家重点实验室北京100876

多媒体消息业务(MMS, multimedia messaging service)作为一种新的移动数据业务已经得到了大规模的应用,在移动智能网上也可以支持这种业务。ITU-T、ETSI对移动智能网支持MMS并无相应的规范,目前国内计划采用的是SCP(service control po... 详细信息

多媒体消息业务(MMS, multimedia messaging service)作为一种新的移动数据业务已经得到了大规模的应用,在移动智能网上也可以支持这种业务。ITU-T、ETSI对移动智能网支持MMS并无相应的规范,目前国内计划采用的是SCP(service control point)与MMSC(multimedia messaging service center)互联的解决方案。本文在对此方案做详细分析的同时,提出了基于CAMEL(customized application for mobile enhanced logic)的MMS体系结构,并对此进行了深入的探讨。在此基础上,分析计算了智能多媒体消息业务对SCP及信令链路造成的影响。

关键词：移动智能网移动数据业务网络融合 MMS CAMEL GPRS

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Construction of Resilient Functions

Construction of Resilient Functions

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The 1st Chinese Conference on Trusted Computing and Information Security

作者： ZHANG Jie, WEN Qiao-yan School of Science, beijing University of posts and {2. , beijing 100876, china state key laboratory of Information Security, Chinese Academy of Sciences, beijing 100039, china

＜正＞ Based on the relationship between nonlinearity and resiliency of a multi-output function, we present a methodfor constructing nonintersecting linear codes from packing design. Through these linear codes, we obtain n-variable, m-output, t-resilient functions with very high nonlinearity. Their nonlinearities are currently the best results for most of

关键词： resilient functions packing design correlation-immune functions linear codes

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Mobile Ubiquitous Network Environment

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ZTE Communications 2007年第1期5卷 54-59页

作者： Zhang Ping, Ji Yang, Feng Zhiyong(Research Center for Wireless New technology, beijing University of {2. and telecommunications, beijing 100876, china)

The Mobile Ubiquitous Service Environment (MUSE), established through the coordination and integration of mobile telecommunications and ubiquitous network in the pursuit of Always Best Experience (ABE), represents the major development trend for the next generation mobile wireless network. Research on MUSE will involve the integration of computing model system, service platform system, operating system and terminal structure system, all of which involve exploration and innovation of new networking structure, its control and management as well as way of measuring. The change in network resources triggers the change in network computing models. To make readers have a basic understanding of mobile ubiquitous network environment, this lecture will introduce MUSE in two sections. The first section describes the background of MUSE and its future development prospect. The second section focuses on the design principles and {2. technologies in MUSE model, which make services realized, as well as the networking structure of MUSE model, and the {2. technologies and design principles of networking.

关键词： work Mobile Ubiquitous Network Environment WCDMA NSE GPP

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隐私保护的自适应垃圾邮件过滤方法研究

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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

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基于通用呼叫控制模型的软交换体系设计

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通信学报 2003年第3期24卷 78-85页

作者：李亚波陈俊亮苏森北京邮电大学程控交换技术与通信网国家重点实验室北京100876

分析了下一代智能化通信网的发展趋势及其体系结构,在这一大背景下,提出了面向下一代网络的基于通用呼叫控制模型的软交换体系,并阐述了该体系设计的原则和特色。

关键词：下一代智能网软交换呼叫控制模型多点控制应用服务器

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