一种基于安全操作系统的防火墙设计与买现

介绍了将Ｂ２安全操作系统与防火墙技术结合,设计了一个包括过滤、应用代理、身份认证和访问控制、完整性相结合的实用防火墙系统。这种防火墙不仅能阻止外部不安全因素蔓延到内部网,而且能解决系统内部安全问题。     

一种网络安全体系的结构

防火墙已经成为人们解决安全问题的一种常用的方法,但是目前的防火墙技术不能有效地解决网络内部的安全问题,并且防火墙的效率问题也越来越多的受到人们的重视。本文提出了结合并行防火墙与入侵检测系统的一种网络安全体系结构。     

一种网络安全体系结构

防火墙已经成为人们解决安全问题的一种常用的方法,但是目前的防火墙技术不能有效地解决网络内部的安全问题,并且防火墙的效率问题也越来越多的受到人们的重视.本文提出了结合并行防火墙与入侵检测系统的一种网络安全体系结构.     

一种混合型防火墙的设计与实现

针对目前中小型企业和事业单位的内部网接入Internet所面临的各种各样的网络安全问题而设计的一种混合型防火墙。该防火墙依据TCP／IP协议的分层结构原理,结合目前Internet网络安全发展的最新技术,从企业网、企业单位信息网和校园网的实际需要出发,借助于目前最流行的一种中小型服务器操作系统－－Linux,设计并实现的一种功能齐全、操作简单、兼容性好而且易于扩展的混合型防火墙。     

网络安全防护体系的研究

随着网络感染病毒、遭受攻击的速度日益加快,以及网络受到攻击做出响应的时间却越来越滞后.解决这一矛盾,传统的防火墙或入侵检测技术显得力不从心,本文在目前的入侵检测,防火墙研究基础上,提出了一种网络安全综合解决方案,该体系结合了另一种主动防御的安全技术-蜜罐,它能够在网络防火墙、入侵检测系统等安全措施的配合下,弥补原有安全防御的不足,抵御外部和内部的攻击,增强网络安全性能.     

Windows2000主机防火墙的设计

针对网络内部的安全问题，对边界防火墙的不足进行了分析与研究，对主机防火墙工作原理和关键技术进行探讨研究，并结合Windows 2000操作系统给出一种设计方案。     

安全WEB隧道技术

当前 ｉｎｔｅｒｎｅｔ应用中,存在着企业组织的网络边界和防火墙的范围不完全一致的问题。企业的职员希望能从防火墙外部访问内部的ＷＥＢ服务,就如同在内部网中访问一样的简便和安全,同时,防火墙能够执行充分的访问控制,记录和监听功能。本文讨论的安全ＷＥＢ隧道技术可以用于解决这个问题。     

安全WEB隧道技术

当前的Ｉｎｔｅｒｎｅｔ应用中存在着企业组织的网络边界和防火墙的范围不完全一致的问题。企业的职员希望能从防火墙外部访问内部的 ＷＥＢ服务,就如同在内部网中访问一样的简便和安全,同时,防火墙能够执行充分的访问控制,记录和监听功能。文中讨论的安全 ＷＥＢ隧道技术就用于解决这个问题。     

基于Kerberos分布式防火墙技术研究

随着计算机网络技术的迅猛发展和Internet/Intranet用户数量的激增,以及新型网络服务的研究、实施和应用,计算机网络安全问题日益突出.使得计算机安全问题成为影响计算机互连网络进一步发展的一个重要因素.以往采用的安全保护中使用的最多的是传统的防火墙机制,可是随着网络技术的不断发展,传统的防火墙已经逐渐不能,满足安全的需要.本文针对传统防火墙所带来的问题,提出了一种基于Kerberos认证的分布式防火墙的新型体系结构,在保留传统防火墙优点的基础上,以Kerberos协议为主要基础,综合网络安全软件算法合理运用防火墙相关知识,实现内部网安全分布式防火墙系统,解决了传统防火墙的安全隐患.为众多内部网络用户的需要重点保护的网络资源提供一个可管理的、分布式的安全网络环境.     

基于Kerberos分布式防火墙技术研究

随着计算机网络技术的迅猛发展和Interilet／Intranet用户数量的激增。以及新型网络服务的研究、实施和应用。计算机网络安全问题日益突出。使得计算机安全问题成为影响计算机互连网络进一步发展的一个重要因素。以往采用的安全保护中使用的最多的是传统的防火墙机制．可是随着网络技术的不断发展。传统的防火墙已经逐渐不能．满足安全的需要：本文针对传统防火墙所带来的问题。提出了一种基于Kerberos认证的分布式防火墙的新型体系结构，在保留传统防火墙优点的基础上．以Kerberos协议为主要基础，综合网络安全软件算法合理运用防火墙相关知识，实现内部网安全分布式防火墙系统，解决了传统防火墙的安全隐患。为众多内部网络用户的需要重点保护的网络资源提供一个可管理的、分布式的安全网络环境。     

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.