一种基于agent的分布式集成框架的设计与实现

对象框架技术已成为当今分布异构环境下建立应用系统集成和软构件的核心技术,为支持分布式客户/服务器应用的开发和集成,我们开展了分布式集成框架CSE/MA的研究和开发,目的在于提供一种支持分布式客户/服务器应用开发的分布式集成框架.方便用户开发和集成分布式客户/服务器应用。     

分布式集成中间体CSE／MA的设计与实现

为扩展分布式计算环境，支持系统集成，本开展了基于多ａｇｅｎｔ的分布式集成中间件ＣＳＥ／ＭＡ的研究，试图为应用开发提供一种开发客户／服务器应用的通用开发框架，支持应用于开发方便灵活地建立各种客户／服务器应用。本着首先提出了ＣＳＥ／ＭＡ的框架结构，讨论利用ＣＳＥ／ＭＡ建立客户／服务器应用的组成成分，工作原理和工作过程，其次，讨论ＣＳＥ／ＭＡ的管理核心Ｒｅｇｉｓｔｅｒ所提供的服务及其实现算法，提     

移动Agent安全机制研究

1.引言近年来,移动agent技术已成为计算机网络和分布式系统最具活力的发展方向,同时移动agent系统也为分布式应用的开发提供了便利。现在,为用户工作站提供各种信息服务的方式以客户/服务器方式为主;将来,移动agent系统将成为主要的信息提供者,它能动态地为agent和网络服务提供支持。     

微软.NET Web服务的安全性

微软公司的NET框架为Web服务安全需求的关键——认证、授权、数据保护及认可提供了支持,这些特性用于确保Web服务的事务处理不被侦听。NET框架为开发者提供了必要的工具。下面将讨论.NET平台和基于.NET的服务器是如何为这些Web服务的安全需求提供支持的。     

基于移动Agent的无线移动计算模型及应用

传统的分布式计算模型客户/服务器模型不适应无线移动计算环境,文中详细分析了扩展的客户/服务器模型及其存在的问题。在此基础上将移动agent应用到扩展的客户/服务器模型,无线移动计算的性能得到了改善。文中还分析了基于移动agent的无线移动计算模型的特点,其中最重要的一点是信息和服务完全分离。最后将基于移动agent的无线移动计算模型应用到移动电子商务系统,设计了一个产品电子交易的原型。     

分布计算环境中冗余服务管理机制的研究与实现

本文以性能、可用性、可扩展性为目标 ,针对三层客户 /服务器体系结构 ,研究分布计算环境中冗余服务的失效管理、性能管理和配置管理 ,并在此基础上开发一个自动、自适应、透明和开放的冗余服务管理系统。本文的主要工作包括 :( 1 )针对现有的冗余服务概念模型的不足 ,本文首先利用分布对象技术定义 HORIS对象模型 ,通过它对分布计算环境中冗余服务的管理问题进行有效描述。基于HORIS模型 ,本文利用 agent技术创建了冗余服务的全局管理框架 AMA,并引入了基于“事件 -条件 -动作”规则的 agent模型实现 AMA框架的自动、自适应管理功能…     

基于可重用框架的软件开发模式及其应用

框架是可重用的特定领域应用软件的半成品，开发者通过定制可以建立具体的应用系统，一个好的框架可大大降低应用系统的开发成本。讨论了基于框架的应用系统开发模式，提出了一个基于多层结构的可重用的交易服务器框架，并给出了该框架的设计方法与实现技术。     

构造PC—LAN客户／服务器计算环境

在客户/服务器计算环境里,一个应用被分成两个部分:前端(客户)和后端(服务器),它们分别在不同的进程(或处理机)上运行。设计客户/服务器体系结构,就是将任务分配给相应的网络硬件及软件环境,得到最优化的计算。在这个环境里,客户的操作主要是完成请求数据访问服务的工作,服务器则实现资源的管理、提供资源的共享访问服务。 整个设计工作主要包括五个部分:构造PC-LAN硬件环境:选择合适的网络服务器软件;选用功能及性能良好的数据库服务器;选用能为最终用户所接受的客户平台;选用开发客户应用的开发环境。     

一种用于迁移工作流管理系统的消息服务框架

作为移动计算的一类应用,现有的迁移工作流模型遵守了按照移动agent范型构造迁移实例的方法。由于移动agent继承智能agent的基本属性,因此,上述方法往往导致迁移实例的代码臃肿和移动困难。考虑到实际上的迁移工作流管理系统,一般地都要求迁移实例工作于一个具有信任合约关系的环境中,因此,可以针对这种特定环境,令工作位置为迁移实例提供尽可能多的服务支持,以便减小迁移实例的代码体积,提高其迁移效率,而不必拘泥于移动agent范型。该文给出了一种嵌入工作位置服务器的消息服务框架,该消息服务框架可以有效降低迁移实例代码规模,实现其轻量化移动。     

计算机系统性能评测技术(下)

四、IBM 客户/服务器性能评测 Benchmark 随着计算机系统应用环境从集中处理逐步趋向分布处理过程中,客户/服务器计算模式已逐渐成熟,并得到广泛应用。很多企业都已建成或者正在建立符合各自应用要求的客户/服务器计算应用系统,因此在美国著名的从事计算机和通信研究及咨询机构Aberdeen集团公司的支持和推动下,IBM 公司于1994年11月开发出客户/服务器性能评测Benchmark,它可以测定客户/服务器计算环境中的事务处理,决策支持和文件服务的性能,它是目前第一个比     

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。     

基于QTE的蒙古文显示机制研究与实现

蒙古语言是中国蒙古族使用的通用语言,由于蒙古文区别于其他文字的书写方式和其自身变形机制等特点,在很多通用的文字处理引擎中都不被支持。在嵌入式产品开发与应用领域中Linux加QTE已经成为流行方式。该文给出了一种在QTE环境上实现基于标准Unicode的蒙古文点阵显示和变形算法, 并自定义了支持蒙古文的QTE组件,扩展了QTE功能,为在Linux加QTE方式的嵌入式体系结构中处理蒙古文提供了一种解决方法。