基于机器学习和NetFPGA的智能高速入侵防御系统

当前网络安全面临着日益多样化的威胁和挑战。入侵防御系统作为一种新兴的、能够动态监视并及时阻断异常网络传输行为的网络安全设备,成为目前主要的研究方向。目前主流的入侵防御系统主要通过人工预设的入侵规则集合对网络流进行匹配来发现、处理入侵,这种方法效率低下、维护困难,且存在严重的处理速度与成本的矛盾。针对上述问题,文章提出了结合基于硬件的网络数据流高速捕获过滤、经典机器学习技术以及当前人工智能领域前沿的深度学习自编码技术的入侵检测新思路,实现了基于NetFPGA的智能、高速的网络入侵防御系统,并在测试中取得了优于其他同一成本水平入侵检测系统的结果。     

入侵防御系统的研究与应用

入侵防御系统是网络安全领城为弥补防火墙及入侵检测系统(IntrusionDetectionsystem)的不足而新发展起来的一种计算机信息安全技术。本文首先介绍了入侵防御系统(IPS)工作原理、IPS的分类,并且对比了防火墙、IDS相对于IPS的局限,提出通过部署入侵防御系统(IPS)来提升网络安全,再就个人经验提出应该怎样在企业网络中部署IPS。最后总结了IPS的发展前景。     

入侵防御系统关键技术研究

随着计算机和网络技术的应用日益普及,各种网络安全问题也日益突出,网络环境日趋复杂,新的攻击方法和手段层出不穷,因此任何一种单一的安全技术都不可能实现真正意义上的网络安全。本文首先对目前第三代网络安全技术--入侵防御系统的概念、分类、工作原理及系统实现的关键技术作了初步的研究,然后在分析现有入侵防御系统优缺点的基础上对未来入侵防御系统的发展作了展望。     

无线局域网入侵防御系统的研究和设计

入侵防御系统是一种新型的网络安全技术,为了对无线局域网的入侵攻击行为进行实时监测和主动响应,设计了一个WLAN入侵防御系统模型--SmartWIPS.系统利用入侵诱骗技术和规划识别方法对无线网络数据包进行分析,能够智能识别攻击者的入侵意图,提供实时响应和主动阻断,从而有效提高WLAN的安全性.     

基于遗传神经网络的入侵防御系统研究

网络安全在今天社会中变得越来越重要。入侵防御系统是信息安全性保证的重要组成部分之一,使用新的方法提高其实时性和适应性已经成为热点。对入侵防御系统基本原理进行研究的基础上,讨论了遗传算法和神经网络相结合在入侵防御中的应用,给出了采用代理技术的系统结构。     

入侵防御系统的进程行为拦截技术研究

在网络安全问题日益严峻的今天,入侵防御系统是能够及时中断、调整或隔离一些不正常或是具有伤害性的网络资料传输行为的重要安全设备.入侵防御系统拦截技术的好坏直接关系到入侵防御系统的性能,分析了进程的攻击行为,对入侵防御系统的进程行为拦截技术进行了研究探讨,并给出了控制进程的实例.     

基于IPS的校园局域网安全体系研究与实现

在网络安全方面,入侵防御系统IPS是为了弥补网络防火墙及入侵检测系统IDS的不足而诞生的一种防御性质的网络安全技术.不同的入侵防御系统实现的方式各不一样,但其共同点是在威胁进入局域网之前进行防御检测。文章论述了目前校园局域网存在的安全隐患、IPS的概念和分类,校园中如何部署IPS及其IPS的优势。     

基于闭环控制的入侵诱骗系统的探讨与实现

当今,随着网络攻击手段的日趋复杂,被动的防御措施已经不能满足网络安全的需要。入侵诱骗作为一种主动的网络安全防御手段,能对入侵者进行实时监测,了解其动机、技术等,进行有针对性的防御和学习。文章首先引入了入侵诱骗的定义及入侵诱骗技术的现状,并提出了由IDS、防火墙和入侵诱骗系统组成互动的安全防护模型,最后对诱骗的技术及其实现作了介绍,提出了现阶段所面临的问题。     

面向物联网的Sybil入侵防御系统设计与实现

设计物联网中的Sybil入侵防御系统,进行入侵检测,保障物联网的网络安全,针对当前入侵防御系统拦截准确性不好的问题,提出基于网络入侵信号检测和前馈调制滤波设计的物联网Sybil入侵防御系统设计方法;首先进行Sybil入侵防御系统总体设计描述和功能分析,然后进行Sybil入侵信号检测算法设计,最后完成面向物联网的Sybil入侵防御系统硬件设计和软件开发,实现系统的集成设计;仿真测试表明,采用该系统进行物联网中的Sybil入侵检测的准确度较高,性能较好,具有较强的兼容性和友好性。     

网络协同安全系统的动态Honey及控制技术

主动式动态网络防御技术是当前网络安全中的一个热点。结合应用协同和联动技术,设计了动态Honey的网络防御系统。构建了两层的防御控制体系,使防火墙、入侵检测、Honey之间实现了有效的互动,提升了网络防御的能力。     

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.