SilverStream AS 3.7.3简化Web Services应用开发

对任何致力于Java的Web Ser-vices开发者来说,简化J2EE应用的开发,提高Web Services的扩展性和协同性,都是迫在眉睫的技术要求。 SilverStream软件公司发布了行业领先的J2EE应用服务器SilverStream Application Server 3.7.3,它提供了一个高性能的Web Ser-vices引擎和工具,用于简化J2EE和基于Web Services的应用开发。SilverStream Application Server 3.7.3全面支持Web Services,包括XML、     

简化J2EE开发

Sun公司9月24日宣布,它将提供针对Java集成开发环境(IDE)的Forte 3.0版工具软件。该新版软件简化了基于J2EE平台的应用程序的开发过程。Java IDE支持J2EE应用服务器的配置,可使iPlanet Application Server 6.0的特性达到最佳化。JavaIDE是SunONE的核心组件之一。 Forte for Java 3.0企业版支持J2EE应用程序的创建和配置。此外,Forte for Java IDE与iPlanet Application Server之间的集成不断在加强,支持了企业Java应用和Web服务     

一个J2EE应用服务器的Web容器集成框架

针对J2EE(Java 2 platform enterprise edition)应用服务器集成Web容器的传统实现方式存在的不足,提出一个两层结构的Web容器集成框架:外层独立于Web容器实现,满足管理工具、部署工具等其他模块与Web容器的交互;内层则是对特定Web容器的包装、扩展或改良.该框架已在J2EE应用服务器PKUAS(Peking Universitv Application Server)上得以实现.测试结果表明,该框架具有良好的可插拔性,实现了应用服务器配置和管理机制的统一,且性能良好.     

与应用服务器平台无关的Web认证和授权方法

针对目前J2EE应用服务器安全模型存在的一些弱点，文中提出了基于LDAP目录服务和J2EE安全模型，与应用服务器平台无关的Web认证和授权的思想和方法，并设计了一个标准的、与应用服务器平台无关的核心认证程序。     

国产Java中间件问世

7月13日获悉,金蝶Apusic应用服务器V3.0产品成功通过Sun Microsystems公司的J2EE应用服务器测试认证,成为中国第一个通过J2EE认证的Java中间件产品。这意味着金蝶Apusic应用服务器产品遵循国际标准和规范。通过J2EE应用服务器测试认证,对企业而言,是一个学习和提高的过程,也是一个产品吸纳成熟技术并得到不断检验的过程。所有声称符合J2EE规范的J2EE类产品(应用服务器、应用软件、开发工具等),必须通过JCP组织(JCP,Java Community Process Java标准制定组织)提供的TCK技术兼容包的兼容性测试。测试通过后,方能在严格意义上宣…     

基于Sun Pet Stroe的J2EE应用开发技术研究

SunPet Stroe是一个基于J2EE技术开发Web应用系统的典型范例。该范例使用了多种Java和J2EE技术。文章基于该范例重点研究了采用J2EE开发企业应用系统的一些关键性技术。     

基于Sun Pet Stroe的J2EE应用开发技术研究

SunPetStroe是一个基于J2EE技术开发Web应用系统的典型范例。该范例使用了多种Java和J2EE技术。文章基于该范例重点研究了采用J2EE开发企业应用系统的一些关键性技术。     

J2EE应用服务器集群性能研究

J2EE集群可提供高可用性和可扩展性服务,J2EE应用服务器的集群性能备受关注.根据J2EE体系结构特征,分层阐述了J2EE集群的关键技术和实现.结合一个在线书店实例,基于JBoss应用服务器量化分析了Web层集群技术的性能.针对高可用性问题,提出了2×n拓扑结构集群机制,实验结果证明该结构能有效降低HTTPSession复制开销,提高系统性能.     

构筑应用基础平台

10月底,东方通科技发布自主研发的国内第一个支持 SUN J2EE 标准的纯JAVA 的企业级 Web 应用服务器——TongWeb 中间件产品及电子商务策略。东方通科技的 TongWeb 应用服务器就是基于 J2EE 的 Web 应用服务器,通过将用户应用的表示服务,商业逻辑和后端数据服务分割开来,形成3层或 N 层分布式Web 应用,为开发者提供一种创建、部署和管理企业网络商务应用的构件化模式。而且,TongWeb 应用服务器支持多种国     

支持EJB动态分布的组件迁移模型与算法

Web应用服务器是Web计算环境下的新型中间件,为基于组件的分布式Web应用提供了基础运行平台.组件静态分布限制了事务性Web应用在运行期间适应执行环境变化的能力.为了满足Web应用的动态分布需求,Web应用服务器需在底层为组件提供一种动态迁移的能力.如何维持组件迁移前后的一致性是组件迁移中最棘手的问题之一.为解决此问题,定义了组件迁移一致性约束CMC(component migration constrains),并给出了在J2EE(Java 2 platform enterpnse edition)应用服务器中支持EJB(enterprise Java Bean)动态分布的组件迁移模型和SLB Copy,SFB_Copy,EB_Copy 3个迁移算法.分析得出SLB_Copy,SFB_Copy和EB_Copy均满足CMC约束.迁移模型和算法已在自主研制的Web应用服务器WebFrame2.0中实现,并已应用到自适应负载平衡、失效恢复等多个方面.     

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.