Web服务发现技术研究

Web服务近年来一直足学术界和工业界的研究热点,其中如何准确而高效地找到符合用户需求的Web服务,更是制约web服务应用发展的重要的问题.目前,为了提高Web服务发现的质量与效率,有很多新颖且有效方法被提出.文中根据Web服务发现技术的研究现状,主要从系统结构、服务描述、匹配方法方面对当前的Web服务发现技术进行归类和介绍,分析和比较了各种服务发现方法的优势和缺点,据此提出了Web服务发现技术面临的主要问题并指出了今后研究发展方向.     

Web服务编排描述语言WS-CDL的形式化模型框架

Web服务编排描述语言WS-CDL从全局的角度定义了一组Web服务之间的协作和交互必须遵守的规则。作为一个基于XML的描述性规范语言,WS-CDL缺乏形式化的模型和验证机制,难以保证协作和交互的正确性。本文针对WS-CDL规范提出了一个基于全局的形式化模型框架Abstract WS-CDL,包括语法、同构关系和操作语义,同时定义了一套从该模型框架到基于Pi-演算描述的局部模型的映射规则,最后通过案例分析给出了全局和局部2个层次的模型验证方法。     

WS-T协议族及其应用研究

介绍了Web服务和事务的相关概念,阐述了传统事务处理协议在Web服务处理环境中存在的问题;然后结合目前流行的WST协议族对Web事务处理作了分析;最后根据分析总结了解决问题的思路,以及在Web服务事务处理中建议采用的策略。     

用于科技基础条件平台的服务合成研究与应用

Web服务之间的交互是面向服务的体系结构(Service-Oriented Architecture,SOA,也称为面向服务架构)中的关键问题.单个Web服务提供的功能往往不能完全满足用户的实际需求,将多个Web服务进行合成实现功能更为强大的服务是SOA必须要解决的问题之一.分析了Web服务合成的研究现状,介绍了Web服务合成方式的分类和商业流程执行语言BPEIAWS,给出了"科技基础条件平台应用服务支撑系统"项目中SOA的设计方案,描述了Web服务合成的关键步骤.该研究成果成功地应用于科技基础条件平台应用服务集成之中,并已通过科技部的前期验收.     

语义Web服务及其在WWW上的应用研究

对语义Web技术和现行Web服务技术进行了简述，说明了将Web Services技术与语义Web技术的糅合可以大幅度地提高Web服务的质量，详细介绍了DAML—S语义Web服务语言，阐述了语义Web技术与Web服务技术结合的互补性和可行性。文中还给出了一个在现今WWW万维网上Web服务应用语义技术的一个简单的发现架构。     

基于Internet工作流的复合Web服务框架

实现灵活方便的企业业务集成一直是信息领域的核心问题，也是B2B电子商务应用的关键．为此将Web服务和传统的工作流技术相结合，设计并实现了支持复合Web服务运行和管理的框架WSFlow．给出了WSFlow的总体结构，描述了其中的关键技术，包括Web服务与工作流活动的动态配置和绑定技术，复合Web服务流程的动态修改以及复合Web服务的运行监控等技术．     

语义Web服务及其在WWW上的应用研究

对语义Web技术和现行Web服务技术进行了简述,说明了将Web Services技术与语义Web技术的糅合可以大幅度地提高Web服务的质量,详细介绍了DAML-S语义Web服务语言,阐述了语义Web技术与Web服务技术结合的互补性和可行性.文中还给出了一个在现今WWW万维网上Web服务应用语义技术的一个简单的发现架构.     

基于QoS的Web服务选择方法研究进展

基于QoS的Web服务选择是从功能相同的Web服务中以Web服务的QoS属性为评价指标选出最优服务的过程,其作为语义Web服务领域的关键技术正在蓬勃发展.文章考察了现有的Web服务选择方法,对其进行了归类,分析了各类方法的优缺点,讨论了这个方向的研究重点及未来的研究趋势.     

基于Web服务生命周期的测试技术研究进展

Web服务是一种新的分布式计算范型--面向服务的体系结构的具体实现之一.然而,Web服务的松耦合、动态性和可组合性等特点给Web服务测试带来了极大的挑战.如何寻求高效的Web服务测试技术和开发实用的测试工具,是当今软件业界一个亟待解决的课题.当前Web服务的测试方法已经贯穿于服务的开发、预发布、运行以及演化的整个生命周期.提出了从Web服务生命周期的角度分析Web服务测试的重要参数,在此基础之上归纳和比较了近年来出现的一些典型的测试方法和技术,最后展望并探讨了Web服务测试今后的研究方向.     

Web服务组合方法综述

Web服务组合通过重用已有的Web服务满足用户高质量的应用需求,是面向服务架构研究领域的热点问题。该文对当前Web服务组合的研究现状进行了综述,分析了WSC的概念和实现框架。根据研究侧重点及其依赖的技术基础,将WSC方法归为两大类别——基于工作流、状态演算和进程代数模型描述的过程驱动的组合方法和基于语义描述的自动服务组合方法。对WSC的评价模型及其研究与应用中所面临的挑战进行了论述。     

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.