基于CORBA的分布式入侵检测模型的设计与实现

针对目前入侵检测系统中面临的平台异构、无统一通信机制和安全策略等问题,将分布式中间件的CORBA技术与入侵检测技术结合在一起,提出了一种新型的基于CORBA的分布式入侵检测系统模型(CDIDS)。从入侵检测系统的发展、分布式入侵检测系统和CORBA技术谈起,详细讲述了基于CORBA的分布式入侵检测系统模型的体系结构、实现方法和安全问题,并解决了基于CORBA的入侵检测系统的异步调用死锁问题。     

一种基于CORBA技术的分布式入侵检测系统

针对入侵检测对分布式计算越来越高的要求,该文提出了一种基于CORBA技术的分布式入侵检测系统模型。该模型采用“代理器-分析器-管理器”的结构,特点是弱中心的管理方式,可以提高入侵检测系统自身的安全性。在检测方法上,实现了分布式检测,有利于提高检测的准确度。最后分析了在入侵检测中采用CORBA技术带来的好处和应该注意的问题。     

分布式对象模型应用技术研究

通过介绍分布式计算十大范型中的分布式对象模型,并针对该模型下的远程方法调用技术、对象请求代理及基于构件技术进行了较为深入的分析和比较,就RMI、CORBA、COM、DCOM及EJB进行了探讨。对分布式对象技术今后的发展作了展望。     

基于CORBA技术的分布式入侵监测系统模型

网络技术迅速发展,网络规模曰益扩大,传统的入侵监测系统的功能受到很大限制。基于分布式计算的分布式入侵监测技术是解决问题的好方法。本文首先简要介绍网络安全现状、入侵检测技术和CORBA技术,然后给出应用CORBA建立的分布式入侵监测系统体系结构。     

CORBA技术在入侵检测系统中应用的探讨

从局域网的特点出发,提出了基于CORBA技术的分布式入侵检测系统模型。该模型采用基于WEB方式的入侵检测系统管理界面,在检测方法上,提出了服务器检测代理的概念,综合了传统的网络检测代理和主机检测代理的功能,有利于提高检测的准确度。最后分析了在入侵检测中采用CORBA技术带来的好处和应该注意的问题。     

一种基于CORBA分布式对象的容侵恢复策略

基于分布式对象容忍入侵系统的研究是入侵容忍的研究热点之一。国内外对分布式对象容忍入侵系统架构方面已做了一定的研究,但均未侧重于系统中对象恢复策略。该文在研究SITAR模型的基础上提出了一种基于CORBA中间件分布式对象容忍入侵系统的模型,在该模型下提出了分布式对象的对象恢复策略,和传统恢复策略相比,该恢复后的对象对原来的入侵攻击在某种程度上有一定的免疫力。通过一个实例验证了恢复策略,结果表明它可使对象向前恢复到正确结果。     

异构分布式对象互操作模型研究

分布式对象技术,如EJB(EnterpriseJavaBeans)、CORBA(CommonObjectRequestBrokerArchitecture)、COM(CommonObjectModel),允许运行在一台机器上的对象被不同计算机上的客户端应用程序使用。该文在研究上述三种主流分布式对象标准及其两两互操作技术的基础上,提出了一种三种标准间互操作的模型及总体设计,并实现了桥中当已经得到某种标准的客户调用请求后对另外标准对象的调用。     

CORBA服务的形式化分析

1 引言 CORBA,公共对象请求代理体系结构(Common ObjectRequest Broker Architecture,CORBA)是对象管理组织OMG(Object Management Group,OMG)在OMA(ObjectManagement Archtecture,对象管理体系结构)基础上定义的对象请求代理(ORB)的公共结构。CORBA是国际对象管理组织(OMG)遵循分布式对象技术,制定的一整套公认的基于可商用对象技术的标准,CORBA为建立大型复杂的分布式应用系统提供了新方法。 OMG定义了一套CORBA公共对象服务规范COSS(Common Object Serves Specification),为用户构建分布式大规模应用系统提供了标准的解决方案。CORBA服务包括命名服务、事件服务以及生命周期服务等通用的十多种服务,用     

基于CORBA的分布式网络行为监控系统的研究与设计

本文提出了一种基于CORBA的分布式网络监控系统的整体模型,监控来自于内部和外部两个方面的网络入侵行为,实现中采取了协议分析、多路入侵检测机制、分布式监控数据库等关键技术,使得系统自身具有良好的可扩展性、可重用性、可靠性以及具有较高的通信质量和处理效率等。     

基于人工免疫和CORBA的入侵检测系统设计

简述人工免疫和CORBA的主要技术特征,研究人工免疫与CORBA相结合的分布式入侵检测技术,给出一个系统模型,描述系统模型的工作机制,为下一步的研究工作打下了基础.     

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.