业界信息

焦点关注第二届全国信息技术与产业发展论坛在南京举行由中国电子学会、江苏省计委、信息产业厅、通信管理局、南京邮电学院联合主办的第二届全国信息技术与产业发展论坛，２００２年１２月６—８日在南京举行。会议主题为中国信息化与经济发展，将重点就最新信息技术、无线通信网络、企业信息化等议题进行研讨。目前，江苏信息产业占国民经济产值为６％，２００５年将达到８％，软件产值占全国的１／１０，在全国率先启动信息化带动工业化具有良好的基础。当前，信息化带动工业化最现实的是制造业自动化，如采用嵌入式软件提高工业设备自动…     

有福同享 网络共享空间咱选谁

相信很多朋友都有这样的经历：想在论坛上与其他网友分享一些东东（图片，音乐，视频……），但由于论坛的附件大小限制，不能直接将文件上传到论坛上。这时，我们就需要借助网络共享空间了。 目前网络上提供文件共享服务的网站很多，有附带共享功能的网络硬盘，也有专业的文件交换空间。在这些网站中，究竟哪家最适合我们呢？[编者按]     

国门内外B2B之网络推广

提到网络推广，很多企业并不陌生，诸如关键词搜索、竞价排名、论坛发贴等方法早已流传甚久，但是，一样都是设立关键词、到论坛发贴，为何企业与企业之间的推广效果却是千差万别呢？     

“2005反互联网金融欺诈和网络钓鱼论坛”召开

6月15日，“2005反互联网金融欺诈和网络钓鱼论坛”在京举行。公安部、中国人民银行和中国证监会的有关领导出席，来自网上银行服务单位、网上证券服务单位和北京市网络行业协会会员单位的约100名代表参加了论坛。     

面向Web论坛的网络信息获取技术及系统实现

网络爬虫技术是网络信息获取的重要手段,面向Web论坛的信息获取则是网络爬虫技术所面临的新课题.在分析和研究面向Web论坛信息获取技术的基础上,本文设计和实现了一种用于Web论坛信息获取的主题网络爬虫系统,根据Web论坛信息组织结构,提出了基于遍历策略的信息搜索技术;根据正文信息分布及论坛自身特点,提出了基于DOM与分块...     

五步建立Discuz！论坛

酷热的夏天渐渐过去，网络产业的春天渐渐来临。火热的网络伴随渐凉的天气，成了这个夏末秋初最和谐的组合。昔日的过客们，逐渐从菜鸟的阶段走出来，在有了自己的网站后，又进发了自建论坛的念头。在线论坛是网站中最直接和最方便的和网友沟通的场所，因此拥有一个自己的网上论坛也成为很多网友梦寐以求的理想。有了这样的需求，近年来通用产品式的论坛软件逐步成熟起来，从最早期的UBB、到国外的     

带本小说随“身”看

一句“冬雷阵阵夏雨雪”让网络写手张嘉佳红遍大江南北，也再一次掀起了一股上网看小说的热潮。有经验的网虫应该知道，现在网络上最火的小说，一般不会最早出现在专业的书站中，反倒是天涯、西祠、猫扑等知名论坛才是这些原创小说的发迹之地。可是如何把这些论坛中的小说帖收藏起来，让自己走到哪里都能看呢？论坛的网络收藏夹，你快出来吧![编者按]     

网络视频接口论坛规范安全监控标准

日前，安讯士网络通讯有限公司联合博世安保有限公司（Bosch Security Systems：及索尼公司宣布三方将携手共同成立一个国际开放型网络视频产品标准网络接口开发论坛。该论坛被命名为ONVIF（开放型网络视频接口论坛）。此论坛将成为一家独立的非营利型组织，并保证以公开、开放的原则共同制定开放性行业标准。     

网络视频接口论坛规范安全监控标准

日前，安讯士网络通讯有限公司联合博世安保有限公司（Bosch Security Systems：及索尼公司宣布三方将携手共同成立一个国际开放型网络视频产品标准网络接口开发论坛。该论坛被命名为ONVIF（开放型网络视频接口论坛）。此论坛将成为一家独立的非营利型组织，并保证以公开、开放的原则共同制定开放性行业标准。     

网络论坛的自相似性及其模型

网络论坛是一种主要的互联网应用,人们对它的研究主要集中在话题分析、变化趋势分析等方面。该文研究网络论坛中文章数随时间变化的统计特性,通过方差分析、R／S分析方法发现自相似性存在于网络论坛中。为描述这种自相似性,提出一种基于时延厚尾分布的产生式模型,对该模型进行理论与仿真分析,验证了该模型具有表达网络论坛自相似性的能力,模型的计算复杂度小。     

应用于MOEMS集成的TSV技术研究

硅通孔(TSV)通过缩短互连长度可实现低延迟、低功耗等目的。对应用于微光机电系统(MOEMS)集成的TSV工艺进行了研究,通过ICP-DRIE参数优化获得了陡直TSV通孔;通过金-金键合及bottom-up法,实现了TSV的无缺陷填充;对填充后的TSV进行电学表征,测试结果表明,单个TSV的电阻平均值为0.199Ω、相邻两个TSV的电容在无偏压时为170.45 fF、TSV的漏电流在100 V时为9.43 pA,具有良好的电学特性。     

An Attack-Finding Algorithm for Security Protocols

This paper proposes an automatic attack construction algorithm in order to find potential attacks on ecurity protocols.It is based on a dynamic strand space model,which enhances the original strand space model by introducing active nodes on strands so as to characterize the dynamic procedure of protocol execution.With exact causal dependency relations between messages considered in the model,this algorithm can avoid state space explo-sion caused by asynchronous composition.In order to get a finite state space,a new method called strand-added on demand is exploited,which extends a bundle in an incremental manner without requiring explicit configuration of protocol execution parameters.A finer granularity model of term structure is also introduced, in which subterms are divided into check subterms and data subterms .Moreover,data subterms can be further classified based on the compatible data subterm relation to obtain automatically the finite set of valid acceptable terms for an honest principal.In this algorithm,terms core is designed to represent the intruder‘s knowledge compactly,and forward search technology is used to simulate attack patterns easily.Using this algorithm,a new attack on the Dolve-Yao protocol can be found,which is even more harmful beeause the secret is revealed before the session terminates.     

H.264视频解码的OpenMP并行优化

随着H.264视频格式得到广泛应用,对H.264解码的效率要求越来越高,对JM15.1模型中的H.264解码过程进行了分析.采用共享存储编程的工业标准OpenMP对解码过程进行了并行区的设置.设置私有变量防止数据竞争和调整了负载.解码效率提高了10%左右.     

基于距离修正及灰狼优化算法对DV-Hop定位的改进

无线传感器网络在实际应用中普遍存在节点布设不均匀的状况,导致使用经典DV-Hop(Distance Vector-Hop)方法实现节点定位存在较大的误差。为了提高定位精度,提出基于测距修正及灰狼优化算法的改进策略。首先,针对未知节点到每一目标锚节点的平均每跳距离校正值,采用一种相似路径搜索算法获得网络内一条最相似锚节点对间的多跳路径用于确定该值,以期提高未知节点到锚节点距离估计值的精度;进而,在使用Lateration算法获得未知节点初始位置后增加改进的灰狼群体智能算法优化步骤,以期提高定位精度。仿真实验结果显示,所提出的改进策略相对经典DV-Hop定位方法以及典型的改进方法,提高了对网络拓朴变化的鲁棒性,定位精度有了显著改善。     

A General Probability Formula of the Number of Location Areas＇ Boundaries Crossed by a Mobile Between Two Successive Call Arrivals

Mobility management is a challenging topic in mobile computing environment. Studying the situation of mobiles crossing the boundaries of location areas is significant for evaluating the costs and performances of various location management strategies. Hitherto, several formulae were derived to describe the probability of the number of location areas‘ boundaries crossed by a mobile. Some of them were widely used in analyzing the costs and performances of mobility management strategies. Utilizing the density evolution method of vector Markov processes, we propose a general probability formula of the number of location areas‘ boundaries crossed by a mobile between two successive calls. Fortunately, several widely-used formulae are special cases of the proposed formula.     

增强灰狼自适应阈值去噪法在变压器套管引线超声检测中的应用

超声检测作为一种新型的电力设备检测方式,回波信号极易受到噪声干扰,为了提高信号质量,提出了一种增强灰狼自适应阈值去噪法。首先,对信号进行多尺度小波分解,引入基于梯度下降自适应阈值法,用于估计不同小波分解层的阈值大小。然后改进传统灰狼算法的变异策略与收敛因子,优化自适应阈值函数梯度值,确定最优阈值并完成信号去噪。对仿真及实测超声回波信号的去噪结果表明,经本算法去噪后,超声回波信号的起振位置等有效信息得以保留,信号信噪比更高,均方误差更小,运行时间更短。本算法应用到变压器套管引线超声检测中,可提高超声检测的准确性,获取了变压器套管引线的状态,具有一定的应用价值。     

Sliding mode control for a class of nonlinear It ô stochastic systems with state and input delays

This paper deals with the problem of sliding mode control (SMC) for a class of nonlinear stochastic systems. The nonlinear uncertainties are unknown and unmatched. There exist state and input delays. A special switching function is designed such that the insensitivity of the system can be guaranteed throughout the entire response of the system from the initial time instance. Both the sliding surface and the sliding mode controller exist if a set of matrix inequalities is feasible. A simulation example is given to illustrate the proposed method. Recommended by Editorial Board member Poo Gyeon Park under the direction of Editor Young Il lee. The research was partially supported by NNSF under Grant (60674015, 60674089), the Technology Innovation Key Foundation of Shanghai Municipal Education Commission (09ZZ60), Shanghai Leading Academic Discipline Project (B504), China. Yugang Niu received the Ph.D. degree in Control Theory and Control Engineering Automation from Nanjing University of Science and Technology in 2001. His research interests include nonlinear control, stochastic control systems, sliding mode control and network congestion control. Bei Chen received the B.S. degree in Automation from East China University of Science & Technology in 2008. Her current research areas are sliding mode control, and networked control systems. Xingyu Wang received the Ph.D. degree in Industrial Automation from the East China Chemical Institute in 1984. His current research areas primarily cover control theory and applications, intelligent control, and brain control with its wide range of applications.     

基于低温SQUID瞬变电磁系统的涡流补偿方法

为了避免瞬变电磁法TEM(Transient Electromagnetic Method)系统中的金属成分受发射场激发带来的涡流干扰,本文利用传输函数与发射场卷积获得系统涡流大小,并进行抵扣,以获得真实的地下响应信号。文中介绍了瞬变电磁法工作原理,描述了涡流形态及对SQUID接收信号的影响,同时建立了SQUID系统传输函数的测量装置,并对该传输函数的卷积效果进行了验证,确保卷积结果与实测结果一致。实验结果证明该涡流补偿方法可以应用于实际探矿工作中,提高了探测精准度。     

Integrated Differentiated Survivability in IP over WDM Networks

The problem of differentiated Multi-Layer Integrated Survivability (MLIS) in IP over WDM networks is studied, which is decomposed into three sub-problems: survivable strategies design (SSD), spare capacity dimensioning (SCD), and dynamic survivable routing (DSR). A related work of network survivability in IP over WDM networks is firstly provided, and adaptive survivable strategies are also designed. A new Integrated Shared Pool (ISP) approach for SCD is then proposed, which is formulated by using integer-programming theory.Moreover, a novel survivable routing scheme called Differentiated Integrated Survivability Algorithm (DISA) for DSR is developed. Simulation results show that the proposed integrated survivability scheme performs much better than other solutions (e.g., “highest layer recovery” and “lowest layer recovery” schemes) in terms of traffic blocking ratio, spare resource requirement, and average traffic recovery ratio in IP over WDM networks.