外刊

Sun试图推进Java的互用性Web服务规范成为努力的关键Sun公司正在努力改善Java和微软的.NET平台之间的互用性,他们计划开发和发布几个工业范围的Web服务规范的开源版本。Sun公司正在规划WS-*规范在消息、元数据、安全性和服务质量方面的实现。这些规范包括:·WS-Addressing(Web服务寻址)·MTO(MMessageTransmissionOpti-mizationMechanism,消息传输优化机制)·WS-MetadataExchang(eWeb服务元数据交换)·WS-Security(Web服务安全性)·WS-SecureConversation(Web服务安全对话语言)·WS-ReliableMessagin(gWS-可靠消息传递)·…     

基于WS-addressing构建SOAP消息调用

Web服务寻址定义了一种新的规范,为标准化指定Web服务的位置提供了方法.介绍了Web服务寻址的主要框架,并通过具体的例子详细展示了如何使用WS-addressing规范构建SOAP消息调用;在此基础上进一步分析了基于Web服务寻址实现SOAP消息的异步传输和跨多种协议传输;讨论了Web服务寻址对未来Web服务产生的深远影响.     

异构系统集成中基于WS Addressing的消息安全转发方案

由于Web Services原有的消息寻址规范WSRouting存在安全隐患,W3C制定了WSAddressing规范,用于替代WSRouting。提出一种基于WSAddressing规范的解决方案,使用一致的寻址模式发送事件消息来实现消息级的安全,提高异构系统集成的安全性。     

基于Web Services的动态B2B商务应用集成

传统企业应用集成是一种紧密耦合的、面向特定应用逻辑的应用集成模式.针对传统企业应用集成模式的弊端,提出了一种基于WebServices的动态应用集成模式,采用这种集成模式可以有效地屏蔽各种企业应用的具体开发平台.WS-Routing是SOAP协议的扩展规范.这个规范增加了消息发送的路由选择,把这种扩展规范引入到基于Web Services的应用集成模式中,可以建立一种动态、高效的应用集成模式.     

位置透明的MA可靠消息传递机制

移动Agent系统中的通信机制多由RMI加上消息发送机制实现，在现有的三种主流消息发送机制上进行改进，提出了新的消息转发策略——资源分散模型(Resource Distributed Model)。RDM提供了一种类似于结合了Homeagent和按路径转发方式的寻址策略，达到消息可达的目的，基于RDM的移动服务(Mobile Service)是一种在快速寻址后将消息快速转发的方式，MS减少了消息缓存部件的消息缓存量，并可用多个MS同时寻址从而提高消息发送速度。     

一种改进的移动Agent通信机制研究

通过对现有移动Agent通信机制的分析,将移动Agent名字解析机制与消息传递机制相结合,提出一种高效可靠的移动Agent通信模型.利用域名服务器(domain server)和移动Agent系统的通信部件(communicator)相结合来实现移动Agent通信.采用全局命名方式ADHN,以解决透明寻址问题.对于消息处理,则使用基于邮箱的消息缓存和转发机制,移动Agent状态、消息超时和优先级的引入很好地解决通信失效问题,提高了通信效率.     

基于主动通信的移动Agent消息保序机制

分析了现有各种移动Agent通信机制的缺陷,基于移动Agent主动通信机制,提出了一种系统并发下的消息保序机制,描述了数据结构和算法,并进行了算法分析.该机制支持移动自由和透明寻址,并能提高通信可靠性.     

实现LON网消息的显式寻址

关于网络消息的显式寻址，在有关的资料中都未给出枳共参考的例子，本文作者结合所研究的课题，在对ＬＯＮ网络软件结构进行详细深入的研究后，侧重通信部分通过实例介绍ＬＯＮ网的显式寻址的实现。     

高效可靠的移动Agent通信模型

为了解决移动警务通的通信效率和安全问题,将移动Agent名字解析机制与消息传递机制相结合,提出一种高效可靠的移动Agent通信模型.为构造该模型,引入全局命名方式UAID(univcrsal agent identity)来对环境中的所有Agent进行统一命名.然后基于该种命名方式给出其名字解析机制,以解决透明寻址问题;对于消息处理,别使用基于邮箱的消息缓存和转发机制,移动Agent状态、消息超时和优先级方案的引入能够很好地解决通信失效问题.     

物联网资源寻址模型

通过分析物联网资源寻址特性,对互联网资源寻址的层次迭代模型进行扩展.提出物联网资源寻址的通用层次模型,为解决由多种物品编码标准共存而引起的物联网资源寻址的特有问题提供理论模型依据.根据此模型,建立物联网资源寻址的应用结构模型,并通过对其功能性的实现,验证了通用层次模型的有效性及可行性.     

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     

煤矿井下安全监控分站的设计及其仿真实现

为了设计一种具有低成本、低功耗、易操作、功能强且可靠性高的煤矿井下安全分站,针对煤矿安全生产实际,文章提出了采用MCS-51系列单片机为核心、具有CAN总线通信接口的煤矿井下安全监控分站的设计方案;首先给出煤矿井下安全监控分站的整体构架设计,然后着重阐述模拟量输入信号处理系统的设计过程,最后说明单片机最小系统及其键盘、显示、报警、通信等各个组成部分的设计;为验证设计方案的可行性与有效性,使用Proteus软件对设计内容进行仿真验证,设计的煤矿井下安全监控分站具有瓦斯、温度等模拟量参数超标报警功能和电机开停、风门开闭等开关量指示功能;仿真结果表明:设计的煤矿井下安全监控分站具有一定的实际应用价值.     

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。