基于智能防火墙的网络安全设计

本文分析了传统防火墙所存在的缺点,讨论了网络层与应用层信息在防火墙安全策略制定过程中综合应用的方法。研究了防火墙过滤规则自动产生与配置的途径,提出了一种基于智能防火墙网络安全的模型和实现方法。     

浅析攻击防火墙的几种方法及对策

本文分析了当前防火墙所存在的主要缺陷和几种攻击防火墙的技术原理,并给出了相应对策.     

防火墙的安全性分析

防火墙作为最广泛采用的安全产品为网络安全的不同方面提供了不同程度的防护功能。该文从防火墙的安全技术分析入手,对其安全防护性能进行评估,剖析了常见的防火墙攻击手段,深入阐述了四类防火墙技术的原理、特点以及实现方法,同时针对防火墙不同的安全性能,归纳并总结了防火墙所采用的常用安全措施,最后指出了目前防火墙技术存在的弱点。     

一种防火墙规则配置异常分析方法

从集合角度描述防火墙过滤规则及规则之间存在的异常类型,给出规则间异常类型判定方法。指出直接使用判定方法分析防火墙规则集时所存在的问题,提出一种基于规则顺序敏感性的防火墙规则配置异常分析方法,得到等效的不相关规则集,实现过滤规则的改写。     

基于智能型防火墙INTRANET网络安全技术的研究

论文先比较分析了传统防火墙所存在的缺点,讨论了Intranet的网络层与应用层信息在防火墙安全策略制定过程中综合应用的方法,研究了防火墙过滤规则自动产生与自动配置的途径,提出了一种基于智能型防火墙Intranet网络安全的方案及其模型和实现方法。它克服了传统防火墙对未列出的黑客攻击不予理会的等弊病。     

一种分布式防火墙过滤策略的异常检测模型

分布式防火墙的安全性很大程度上取决于过滤策略正确配置。过滤策略的异常可能导致分布式防火墙系统所保护的网络出现严重的访问漏洞。为了能够自动化地检测分布式防火墙过滤策略存在的异常,对分布式防火墙系统中各过滤节点上的过滤规则之间可能出现的异常进行分类,并建立了一个过滤策略异常检测的模型。该模型能够检测出分布式防火墙过滤规则之间的冗余、冲突、不完整等各种异常,从而保证了分布式防火墙过滤策略的完整性和一致性。     

新一代防火墙技术探索

近年来,网络病毒、黑客攻击肆虐,网络系统的安全性受到严重的威胁,而当前的防火墙技术已明显落后于安全形势的需要,而一些较先进的防火墙技术又为国外一些企业所垄断。本文从市场需求出发,对传统的防火墙的工作原理和存在的不足作了一定程度的剖析,并从技术层面对新一代防火墙的工作原理及应达到的技术要求作了一定的阐述。     

防火墙的研究与实现

介绍了防火墙的概念、原理、分类及比较,指出传统防火墙存在的不足之处,提出了一种新型防火墙系统—嵌入式防火墙系统,最后对防火墙的发展作了前景展望。     

网络安全之防火墙

网络信息系统的大量使用,使得信息的安全越来越为人所重视。本文主要介绍了利用防火墙技术保护网络中信息安全所存在的问题,并给出了一些解决办法。     

一种实现IPSec和主机防火墙的设计

该文考虑到主机通信安全和防护安全的整体性和一致性要求,对IPSec与软件防火墙在终端主机上的应用所存在的问题进行了分析;探讨了将两者进行框架整合的优势;给出了一种实现IPSec安全协议和主机软件防火墙的设计方案,以及关键技术。     

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.