基于移动代理的分布式并行计算中间件设计与实现

文中提出了一个基于移动代理(Mobile Agent)的分布式并行计算中间件，用于将Internet用户闲置的计算资源与其他成员共享。针对分布式并行计算中存在的问题，利用移动代理技术的特点，将中间件的体系结构分为两层，为分布式并行计算提供各种基础服务，尤其是任务迁移和容错机制。着重介绍了分布式并行计算中间件的主要实现技术，实现了一个分布式并行计算原型系统并给出实验结果。     

基于网格的分布并行计算策略

网格计算为用户处理很多复杂问题提供了新方法,用网格实现大规模分布并行计算是必然的趋势。文章给出了基于网格中间件Globus Toolkit来实现分布并行计算的两种策略：紧密耦合并行程序和松散耦台并行服务,并给出实现这两种策略的实现方法,为实现分布并行计算提供了新方法。最后根据所提出的并行计算策略,在网格计算环境下实现了一个分布并行计算实例,并给出了相应的试验结果。     

基于网络的并行计算系统模型

网络并行计算系统是以网络为基础的并行计算系统。近年来随着Internet的迅速发展它引起了人们越来越多的关注。基于这种情况，本文首先对并行计算环境进行了抽象的分析和描述，并建立了一个网络并行计算模型，然后给出了一个基于移动Agent的计算模型实例。     

普适计算环境下基于构件化中间件的上下文管理技术研究

上下文相关技术已经成为普适计算环境中用于应用服务的不可或缺的核心技术之一。对于基于构件的中间件来说,对高性能的上下文管理的需求更是必不可少,因为它构成了普适计算环境中构件适配和部署的重要基础。因此,在已有构件中间件的基础上,我们针对普适计算环境的特点提出了一种整体的上下文管理方法,将上下文管理集成在已有的构件化中间件中。应用表明,该方法能够更好地支持普适计算环境下上下文相关的构件化应用开发。     

基于代理的网格计算中间件

WADE系统是基于代理技术实现的一个可屏蔽异构和分布性的动态自适应的校园计算网格，提出了基于代理技术在校园网络内实现并行计算的方法，详细论述了基于代理的网格计算中间件的体系结构和主要模块功能，阐述了利用代理实现异构编译、协同计算的过程，给出了代理的Java实现方法，利用软件代理实现网格计算中间件，可以解决异构计算平台下多种并行编程环境的协同计算问题，为用户提供统一的服务接口，这将大大增强系统的可用性。     

2005年全国开放式分布与并行计算学术会议征文通知

由中国计算机学会开放系统专业委员会主办、上海大学计算机学院承办、上海计算机学会协办的“2005年全国开放式分布与并行计算学术会议”将于2005年10月27～29日在上海召开,有关信息如下:征文范围(论文范围包括但不限于下列方面)开放式分布与并行计算模型及体系结构;下一代开放式网络、数据通信、网络与信息安全、业务管理技术;开放式海量数据存储与Internet索引技术,分布与并行数据库及数据/Web挖掘技术;开放式机群计算、网格计算、Web服务、P2P网络及中间件技术;开放式移动计算、自组网与移动代理技术;分布式人工智能、多代理与决策支持…     

移动事务处理中间件的研究与设计

移动计算环境下,传统的事务处理中间件已不再适用,移动事务所具备的特性应设计支持移动计算环境的移动事务处理中间件.基于FM-Que移动事务模型,采用组件软件模型设计了移动事务处理中间件,此中间件达到两方面的效果:移动环境的复杂特征和变化对应用透明,移动事务应用可以类似常规应用一样进行开发;应用程序可以利用中间件方便的了解上下文环境信息,有效地实现应用相关的自适应.     

基于AOP和反射计算的动态自适应中间件

Internet为分布式应用提供了一种开放,动态的运行环境,为了使作为分布式应用主要基础设施的中间件能够支持运行时监测并调整系统的内部状态、结构和行为,能够根据运行过程中的环境变化对应用程序的属性和行为做相应的调整,结合使用AOP和反射计算技术的优点,并将AspectLua集成到中间件,中间件的应用配置信息用Lua编写,从而使得构造的中间件具有较好的自适应性。     

支持感知上下文网络操作平台中间件的研究

普适计算的出现将大大改变人类与各种设备交互的方式。支持感知上下文计算的网络操作平台是普适计算环境下重要的应用支撑平台,为基于传感器网络的应用提供操作服务。操作平台以中间件为核心,采用XMLWebServices技术。文章以满足包括智能家居普适上下文应用需求的网络操作平台为基础,介绍该网络操作平台的机制、层次结构和数据模型的研究,并实现了基于该平台模型的XMLWebServices中间件应用方案。     

基于上下文的自适应构件化中间件模型

由于普适计算环境越来越复杂对自适应软件开发要求越来越高,为了对普适计算环境下的自适应和构件化应用提供支持,提出了一种适用于普适计算环境的基于上下文的自适应构件化的CBACM中间件模型。最后,仿真实验结果表明了CBACM模型较传统中间件在自适应成功率、资源消耗和响应时间方面的优势。     

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.