基于自适应直觉模糊推理的入侵检测系统设计与实现

通过对入侵检测技术和自适应神经-直觉模糊推理系统的研究,设计并实现了基于自适应直觉模糊推理的入侵检测系统.首先,详细阐述了系统的总体框架设计及各模块的设计.其次,选用KDDCUP 99数据集作为入侵检测数据集,对设计的入侵检测系统进行实现,并详细叙述了具体的检测步骤.最后,通过获得的检测结果验证了系统的可行性.     

入侵检测系统可信问题研究及改进方法

误报率和漏报率影响入侵检测系统检测结果的可信性.通过从理论上分析误报和漏报产生的原因,提出了多检测系统协同工作提高检测可信度的方法.多检测系统结果融合时采用推进贝叶斯分类方法,给每个检测模型不同的权值,将分类结果加权求和,选择值最大的作为最终分类.实验分析表明,该方法降低了系统的漏报率和误报率,提高了报警的可信度.     

基于无线传感器网络的海水检测系统设计

针对海水检测恶劣环境提出了使用无线传感器网络的海水指标实时在线检测方案;探讨了传感器网络节能路由协议;实现了系统硬件与软件设计.系统将无线检测传感器布置于所检测水域,利用远程无线分组服务数据通信技术远程传输检测数据,通过因特网显示平台的检测点管理查询技术,全面提升了系统的自动化与检测水平.模拟实验结果表明该系统可以实现远程控制中心和监测控制节点的可靠、高速率的通讯.系统体积小、成本低,适用于现场海水污染程度连续检测.     

基于Petri网的入侵检测技术研究

Petri网是一种非常广泛的建模工具.文中研究了Petri网在入侵检测技术中的应用,分析了基于Petri网的入侵检测系统的主要优势以及随着网络的发展给入侵检测系统带来的问题.基于这些问题,提出了基于Petri网的入侵检测系统的改进方法,设计了一个入侵检测系统的原型并进行了实例分析.     

入侵检测系统研究进展

信息安全是人们高度关注的问题,我国信息安全与网络的防护能力尚处于发展的初级阶段.回顾了入侵检测系统的起源及其发展过程.在阐述入侵检测基本概念和类型的基础上,指出了目前各种入侵检测系统的优点和局限性.数据挖掘技术是克服目前入侵检测系统局限性的一种有效方法.介绍了数据挖掘的概念,并提出了一种基于数据挖掘的入侵检测系统框架.蜜罐系统和蜜网系统也是当前研究的热点问题,对其进行了分析,给出了应用实例.最后指出了下一步研究应该努力的方向.     

基于环腔光纤激光器的气体检测方法

基于内腔光纤激光器原理设计了气体检测系统,可以检测气室中待测气体的种类和浓度.在分析气体检测系统的基本构成原理基础上,以乙炔气体为例,进行了气体测试实验,并就检测灵敏度、浓度检测精度两方面分析和计算了该检测系统的性能.结果表明,基于内腔光纤激光器原理的气体检测系统重复性小于0.07,气体检测的灵敏度小于0.03%,气体检测的精度不小于0.17%.     

基于粒子群优化和免疫Agent的入侵检测算法研究

为解决传统入侵检测系统检测速度慢和误检率高的问题,结合量子粒子群优化算法、免疫原理和移动A-gent技术,提出了基于粒子群优化算法和免疫Agent的入侵检测模型.介绍了系统模型与体系结构,并对系统性能进行仿真实验.实验结果对比表明,系统能提高传统入侵检测系统的检测速度和降低误检率.     

数字式超声波无损检测和成像处理系统

论文介绍了一种数字式超声波无损检测和成像处理系统.分析了这一检测系统与传统超声波检测系统的不同点;阐述了系统的工作原理及关键技术部件.     

安防型GPS定位装置自动化检测系统的研制

安防型GPS定位装置的批量生产和检测是安防型GPS定位装置制造厂商面临的问题.本文提出了一种基于RS-485工业总线的计算机自动检测系统,制定了用于该检测系统的通讯协议.该检测系统的研制不仅可以进行生产检验,而且,该系统的设计方法可以应用于其他电子产品的检测.     

基于DM642的多姿态人脸检测实时系统

为满足在嵌入式系统领域上进行人脸检测的需要,采用Gentle Adaboost人脸检测算法设计基于Haar特征的级联型人脸分类器.提出并设计了基于DM642的人脸检测实时系统,以及工程与代码上的优化方案.优化后的系统进行人脸检测的时间为67ms,在系统上达到了13 f/s(帧/秒)的速度,并保证了较高的检测率,验证了在DSP系统上进行人脸检测的可行性.     

Hybrid transport solutions for TDM/data networking services

There is a growing demand for native data transport services for enterprises and corporations across public transport networks. Equipment vendors have begun to incorporate a variety of LAN and storage area network interfaces, notably Ethernet, Fibre Channel/FICON, and ESCON, on traditional metro and long-haul transport equipment. Embracing Ethernet and SAN technology enables the introduction of flexible high-capacity transport services optimized for data networking. Transport operators may thus offer both enterprise-centric connectivity services, such as transparent LAN connectivity and virtual LAN services, as well as traditional bandwidth services, such as private lines, while preserving the operations and management infrastructure of the existing public networks. We discuss the benefits of a hybrid Ethernet/TDM transport solution     

Provider link state bridging

Wide area communications technology has been challenged to virtualize large numbers of Ethernet LAN segments. This is a consequence of a mismatch between the broadcast nature of the LAN segment and the extremely constrained connectivity implied by the p2p connections or tunnels available in the WAN environment, which have been combined to create virtual LAN segments. PBB-TE has been a practical demonstration of how filtering applied to a broadcast media can result in a connection. This article introduces provider link state bridging (PLSB), which adds a control plane to the PBB data plane in order to extend the techniques for manipulation of Ethernet bridges for unicast paths pioneered by PBB-TE. PLSB solves the problem of largescale virtualization of LAN segments over an Ethernet infrastructure by applying advances in computation performance to the multicast capabilities inherent in the Ethernet data plane. The result is that the fundamental primitives of connectivity today, the broadcast LAN segment and the connection, can be virtualized in a scalable manner on a common (but substantially larger and better utilized) Ethernet-based infrastructure.     

基于ARM的电子负载网络监控系统

设计了一种基于ARM的电子负载网络监控系统。给出了以三星S3C2440为核心的嵌入式系统硬件结构和组成,以Windows CE作为嵌入式系统软件平台,采用Embedded VC++开发了可视化的通讯控制软件,实现了RS232总线与以太网的互联。上位机采用Delphi作为开发工具设计了电子负载监控软件,实现了远程监控,多负载控制,数据采集分析等功能。     

Traffic engineering for ethernet over SONET/SDH: advances and frontiers

Continued growth in data services coupled with the entrenchment of existing carrier infrastructures have inevitably forced a convergence of SONET/SDH and Ethernet technologies. As a result, the very notion of Ethernet connectivity has expanded beyond traditional local area domains into broader metro/wide area settings. The key enabling advances have come in the form of improved SONET/SDH provisioning features as well as new carrier Ethernet services standards. These provisions have allowed carriers to build and deploy much improved multigrade point-to-point Ethernet line services and have also opened up new challenges for extended multipoint offerings. This article looks at this evolving area and summarizes recent advances in EoS traffic engineering. It also highlights some key future challenges and presents a novel scheme for multipoint services provisioning in EoS settings.     

Characterization of a High Capacity Multi-User Optical Access Network Using 1 Gb/s 16 QAM Subcarrier Multiplexing

Error free operation assuming common FEC techniques is experimentally demonstrated for a multi-user optical access network based on 40 channel DWDM-PON infrastructure and Gigabit Ethernet 16 QAM subcarrier multiplexing transmission. Such a system would support 400 users with symmetrical 1.25 Gb/s connections and media independent final connectivity. To replicate actual working conditions, the experimental setup relied only on commercially available components and was tested with realistic distance reach and high sub-channel load.     

Optimized routing for providing ethernet LAN services

Ethernet's-move into metropolitan and wide area networks is driving a rapidly growing market opportunity. Current Ethernet services come in two basic flavors, Ethernet line and LAN, providing point-to-point and multipoint connectivity, respectively. The LAN services, although more cost effective, are lagging behind in deployments due to associated QoS and bandwidth provisioning issues. The Ethernet service provider needs to provision the network to meet current and future traffic demands, where the traffic is unpredictable and bursty. The goal is to minimize. overprovisioning and complexity. To add to the challenge, Ethernet routing is based on simple self-learning and relies on spanning tree routing. In this article we propose an Ethernet-specific load balanced routing mechanism, which is robust to dynamic traffic demand. It significantly reduces overprovisioning, is simple and static, and requires only bandwidth profiles associated with service level agreements at the ingress and egress links. Our simulation results show that our scheme provides performance improvements over a recently proposed approach for switched Ethernet as well as a related load balancing approach for Ethernet over MPLS networks.     

AX88180在嵌入式系统中的应用

AX88180是一款高性能低成本的Non-PCI千兆以太网控制器,适用于多种需要高速接入网络的嵌入式系统,如消费电子和家庭网络等.AX88180内置10/100/1000 Mb/s以太网媒体存取控制器(MAC),符合IEEE 802.3/IEEE 802.3u/IEEE 802.3ab协议,可与一般16/32位微控制器连接,其操作与SRAM相同.介绍了AX88180的原理与特性,并给出了具体的应用电路.     

Carrier scale ethernet

Ethernet's ubiquity in both the enterprise and residential markets coupled with the universal existence of mature low-cost technology to implement it is driving the need for Ethernet solutions in the wide area network (WAN) environment. Part of this challenge is to deliver scalable solutions that can support a basket of services from simple point-to-point connectivity through to virtual private LAN services. Today this is being achieved using a number of technologies including synchronous digital hierarchy (SDH), asynchronous transfer mode (ATM), multiprotocol label switching (MPLS), and of course native Ethernet.     

Bridge-on-chip: the enabler of next-generation mobile Internet andvoice-over-IP

A bridge-on-chip (BoC) is a highly integrated yet flexible microprocessor-based Ethernet bridging device. It integrates Bluetooth (technology that enables links between mobile computers, mobile phones, portable handheld devices, and connectivity to the Internet) baseband functionality and an Ethernet controller and on-chip memory in a single chip. It also provides a DSP-based media gateway in support of voice-over-IP (VoIP), and it comes with a full range of embedded TCP/IP software support for various applications. The BoC is a key enabler for real integration of the data and telecommunication networks and services     

Gigabit Ethernet and structured cabling

In today's commercial environment, many organisations depend upon their local-area networks (LAN) and information technology infrastructure for growth, competitiveness and also for sharing of resources, information and applications. More and more users are being networked to provide connectivity to an increasing number of complex and mission-critical corporate applications. More than 80% of the installed network connections were Ethernet by the end of 1996, making it the most popular networking technology in use today. Fast and Gigabit Ethernet have become the leading choices for high-speed LANs. As the use of Fast Ethernet connections to the desktop increases, an even higher speed networking technology at the backbone and server level will be required. Hence, early implementation of Gigabit Ethernet technology will be in high-speed backbones, server connections and specialised workgroups. The total shipments of Gigabit Ethernet products for 1999 exceed 1.5 million ports. This paper describes the Gigabit Ethernet technology, its design and cabling requirements