分布式网络入侵检测系统中的通信设计

为了更好的发现网络入侵,对分布式入侵检测系统的通信机制进行了深入探讨和分析,提出了分布式入侵检测系统控制中心与代理之间以及代理与代理之间的通信的内容、格式,并对分布式入侵检测系统的通信安全性进行了讨论和设计.较好地解决入侵检测系统各部分的通信联系问题,更快地发现入侵.     

基于移动代理的分布式入侵检测系统的研究

分析了现有入侵检测系统的不足,提出了一个基于移动代理的分布式入侵检测系统的模型,对系统中各个组件的功能进行了描述,同时对移动代理的安全问题进行了讨论.该模型采用无控制中心的协作式组件体系结构,完全避免了单点失效问题.移动代理之间各自独立,同时相互通信,协作完成入侵检测任务,真正实现了分布式的检测,增强了系统的灵活性和可扩展性.     

基于SNMP的入侵检测系统的设计与实现

将网络管理系统(NMS)与入侵检测系统(IDS)结合,提出了一种分布式入侵检测系统:简单入侵检测系统(Sim-pleIntrusionDetectionSystem简称SIDS),它引入分层过滤、分布处理、自治代理的思想。系统由收集器、分析器等多级实体组成,实体之间采用SNMPV3进行通信。文章还详细讨论了如何用SNMPV3实现SNMP代理与管理者之间高效、安全、可靠的通信问题。     

基于可信对等的分布式入侵检测通信框架设计

为了提高分布式入侵检测的实时性和安全性,提出了一种可信对等的分布式入侵检测通信框架的模型.该模型借鉴了P2P和代理技术,不同网络节点中的入侵检测代理是对等的,它们之间通过共享检测信息进行整体协防.该模型还借鉴了安全通信技术,在网络中建立了一个认证服务器,不在同一网络节点的任何两个网络进程的通信必须通过该认证服务器,提高了入侵检测自身的安全性.设计实现了一个原型系统,原型系统的实验结果表明了该模型的正确性和可行性.     

基于多代理技术可自检的分布式入侵检测系统模型

通过对现有多代理技术的分布式入侵检测系统的研究,提出了一种基于多代理技术可自检的分布式入侵检测系统模型,并且对该模型的结构,组成和代理的处理流程进行了描述,该模型是一个开放的系统模型,具有很好的可扩展性,易于加入新的入侵检测代理及相应的自检,也易于增加新的入侵检测模式,代理之间的协同采用代理守护进程来实现。     

基于多代理技术可自检的分布式入侵检测系统模型

通过对现有多代理技术的分布式入侵检测系统的研究,提出了一种基于多代理技术可自检的分布式入侵检测系统模型,并且对该模型的结构,组成和代理的处理流程进行了描述,该模型是一个开放的系统模型,具有很好的可扩展性,易于加入新的入侵检测代理及相应的自检,也易于增加新的入侵检测模式,代理之间的协同采用代理守护进程来实现.     

一种基于MA的分布式入侵检测系统研究

分布式入侵检测系统有许多优点,如可测量性和抗破坏性。然而,在具体实施过程中存在着许多障碍。移动代理(MA)技术有着适合分布式入侵检测系统具体实施的许多特性。基于移动代理的分布式入侵检测系统利用移动代理技术同等地处理来自每台被监视主机的信息,然后完成对入侵行为的全局信息提取。本文深入分析了一种基于移动代理的分布式入侵检测系统。     

高校办公网入侵检测系统研究

随着计算机和网络技术的发展,网络入侵事件的日益增加,人们发现只从防御的角度构造安全系统是不够的,入侵检测成为继“防火墙”、“数据加密”等传统安全保护措施后新一代的网络安全保障技术。本文首先介绍入侵检测原理和分布式入侵检测方面的相关工作,在分析已有分布式入侵检测系统模型的基础上,提出了一个基于代理的校园网入侵检测系统模型框架。该模型采用分布式的体系结构,由一个代理控制中心和若干代理组成,结合了基于网络和基于主机的入侵检测方法。使用代理技术在分布式环境下对入侵进行检测,可以有效地检测各种入侵,并具有很好的可扩充性。     

一种基于移动代理的分布式网络入侵检测系统模型

本文设计了一种基于移动代理的完全对等分布式网络入侵检测系统模型。并详细设计了模型中入侵检测代理、系统通信和报警信息日志等系统关键模块。分析结果表明。霞模型具有较好的可扩充性、较轻的通信负载和较好的检测性能。     

ADIDS安全通信模块的设计与实现

为了提高Ad Hoc网络的安全性,基于Snort入侵检测软件设计了一种安全的Ad Hoc分布式入侵检测系统(ADIDS),并实现了系统中各分布式节点上代理(Agent)之间的安全通信.介绍了其中的安全通信模块的设计与实现细节,包括入侵检测交换协议的改进、组播的实现、XML Encryption技术的应用等.实验结果表明,该模块能够适应Ad Hoc网络的特点,并满足ADIDS关于通信效率、通用性和安全性方面的要求.     

Only connect: teaching, technology and telesis

Abstract This paper describes an approach to the design of interactive multimedia materials being developed in a European Community project. The developmental process is seen as a dialogue between technologists and teachers. This dialogue is often problematic because of the differences in training, experience and culture between them. Conditions needed for fruitful dialogue are described and the generic model for learning design used in the project is explained.     

European Community policy and the market

Abstract This paper starts with some reflections on the policy considerations and priorities which are shaping European Commission (EC) research programmes. Then it attempts to position the current projects which seek to capitalise on information and communications technologies for learning in relation to these priorities and the apparent realities of the marketplace. It concludes that while there are grounds to be optimistic about the contribution EC programmes can make to the efficiency and standard of education and training, they are still too technology driven.     

一种自适应子融合集成多分类器方法

融合集成方法已经广泛应用在模式识别领域,然而一些基分类器实时性能稳定性较差,导致多分类器融合性能差,针对上述问题本文提出了一种新的基于多分类器的子融合集成分类器系统。该方法考虑在度量层融合层次之上通过对各类基多分类器进行动态选择,票数最多的类别作为融合系统中对特征向量识别的类别,构成一种新的自适应子融合集成分类器方法。实验表明,该方法比传统的分类器以及分类融合方法识别准确率明显更高,具有更好的鲁棒性。     

Avoiding semantic and temporal gaps in developing software intensive systems

Development of software intensive systems (systems) in practice involves a series of self-contained phases for the lifecycle of a system. Semantic and temporal gaps, which occur among phases and among developer disciplines within and across phases, hinder the ongoing development of a system because of the interdependencies among phases and among disciplines. Such gaps are magnified among systems that are developed at different times by different development teams, which may limit reuse of artifacts of systems development and interoperability among the systems. This article discusses such gaps and a systems development process for avoiding them.     

Designing economic np control charts: A programmed simulation approach

This paper presents control charts models and the necessary simulation software for the location of economic values of the control parameters. The simulation program is written in FORTRAN, requires only 10K of main storage, and can run on most mini and micro computers. Two models are presented - one describes the process when it is operating at full capacity and the other when the process is operating under capacity. The models allow the product quality to deteriorate to a further level before an existing out-of-control state is detected, and they can also be used in situations where no prior knowledge exists of the out-of-control causes and the resulting proportion defectives.     

The development of robot art

Going through a few examples of robot artists who are recognized worldwide, we try to analyze the deepest meaning of what is called “robot art” and the related art field definition. We also try to highlight its well-marked borders, such as kinetic sculptures, kinetic art, cyber art, and cyberpunk. A brief excursion into the importance of the context, the message, and its semiotics is also provided, case by case, together with a few hints on the history of this discipline in the light of an artistic perspective. Therefore, the aim of this article is to try to summarize the main characteristics that might classify robot art as a unique and innovative discipline, and to track down some of the principles by which a robotic artifact can or cannot be considered an art piece in terms of social, cultural, and strictly artistic interest. This work was presented in part at the 13th International Symposium on Artificial Life and Robotics, Oita, Japan, January 31–February 2, 2008     

Explanation and prediction: an architecture for default and abductive reasoning

Although there are many arguments that logic is an appropriate tool for artificial intelligence, there has been a perceived problem with the monotonicity of classical logic. This paper elaborates on the idea that reasoning should be viewed as theory formation where logic tells us the consequences of our assumptions. The two activities of predicting what is expected to be true and explaining observations are considered in a simple theory formation framework. Properties of each activity are discussed, along with a number of proposals as to what should be predicted or accepted as reasonable explanations. An architecture is proposed to combine explanation and prediction into one coherent framework. Algorithms used to implement the system as well as examples from a running implementation are given.     

Three Process Perspectives: Organizations, Teams, and People

This paper provides the author's personal views and perspectives on software process improvement. Starting with his first work on technology assessment in IBM over 20 years ago, Watts Humphrey describes the process improvement work he has been directly involved in. This includes the development of the early process assessment methods, the original design of the CMM, and the introduction of the Personal Software Process (PSP)^SM and Team Software Process (TSP){^SM}. In addition to describing the original motivation for this work, the author also reviews many of the problems he and his associates encountered and why they solved them the way they did. He also comments on the outstanding issues and likely directions for future work. Finally, this work has built on the experiences and contributions of many people. Mr. Humphrey only describes work that he was personally involved in and he names many of the key contributors. However, so many people have been involved in this work that a full list of the important participants would be impractical.     

基于复小波噪声方差显著修正的SAR图像去噪

提出了一种基于复小波域统计建模与噪声方差估计显著性修正相结合的合成孔径雷达(Synthetic Aperture Radar,SAR)图像斑点噪声滤波方法。该方法首先通过对数变换将乘性噪声模型转化为加性噪声模型,然后对变换后的图像进行双树复小波变换(Dualtree Complex Wavelet Transform,DCWT),并对复数小波系数的统计分布进行建模。在此先验分布的基础上,通过运用贝叶斯估计方法从含噪系数中恢复原始系数,达到滤除噪声的目的。实验结果表明该方法在去除噪声的同时保留了图像的细节信息,取得了很好的降噪效果。     

How do children do mathematics with LOGO?

Abstract  This paper considers some results of a study designed to investigate the kinds of mathematical activity undertaken by children (aged between 8 and 11) as they learned to program in LOGO. A model of learning modes is proposed, which attempts to describe the ways in which children used and acquired understanding of the programming/mathematical concepts involved. The remainder of the paper is concerned with discussing the validity and limitations of the model, and its implications for further research and curriculum development.