基于插件技术的企业应用集成架构研究

企业应用集成已经成为实现企业主要战略目标的必需手段和捷径。胜利油田物探研究院在实施企业信息化规划过程中遇到许多实际问题,不同时期实施的企业应用形成一个个信息孤岛,为企业应用集成带来诸多不便。插件式体系结构的灵活性给企业应用集成提供了一种实现途径。插件技术将应用程序分为主程序和插件程序2个部分,两者之间通过接口实现交互,使系统具有较高的可伸缩性。插件机制实现的技术手段之一是OSGi,OSGi规范的核心框架提供了一个通用、安全、可管理的支持以Bundle方式下载并扩展部署的.1ava框架。基于OSGi规范和框架的实现的插件式企业应用集成框架,具有灵活性、松耦合、跨平台、扩展性好等特点,能够很好的适应企业应用集成的需要。     

Architecture research of enterprise aipplication integration based on plugin

企业应用集成已经成为实现企业主要战略目标的必需手段和捷径.胜利油田物探研究院在实施企业信息化规划过程中遇到许多实际问题,不同时期实施的企业应用形成一个个信息孤岛,为企业应用集成带来诸多不便.插件式体系结构的灵活性给企业应用集成提供了一种实现途径.插件技术将应用程序分为主程序和插件程序2个部分,两者之间通过接口实现交互,使系统具有较高的可伸缩性.插件机制实现的技术手段之一是OSGi,OSGi规范的核心框架提供了一个通用、安全、可管理的支持以Bundle方式下载并扩展部署的Java框架.基于OSGi规范和框架的实现的插件式企业应用集成框架,具有灵活性、松耦合、跨平台、扩展性好等特点,能够很好的适应企业应用集成的需要.     

cwinOSGi:Windows平台下基于C++的OSGi框架设计与实现

OSGi(Open Service Gateway Initiative)服务平台规范定义了一个开放的一般性架构,为网络服务、软件的开发和部署提供一致性的协作环境,其核心是提供一个通用、安全并且可管理的Java框架.OSGi规范本身利用了Java语言的特性,非常适合用Java实现.但其Java实现对系统资源的消耗较大并且运行时依赖Java虚拟机环境(JVM),不适合在系统资源较少和未安装JVM的环境中使用,例如移动设备.本文在分析OSGi框架原理的基础上,提出了一种轻量级的Windows平台下基于C++的OSGi框架实现方案--cwinOSGi,重点解决了组件的打包方式、加载方法、组件间的可见性及动态更新等关键技术问题,实现了OSGi模型的主要功能.实验证明,与OSGi框架的Java实现相比,cwinOSGi的系统资源需求大幅降低,具有更广的适应性.     

一种基于OSGi的服务动态化模型应用

针对SOA应用系统构建过程中对服务动态部署、服务查找、需求变更的适应性以及系统可扩展性方面的要求,主要介绍了面向服务体系结构的特点和不足,阐述了OSGi的相关理论及应用优势,通过SOA与OSGi相结合,提出了一种支持服务动态化部署和应用的OSGi模型。并且结合具体案例详细描述了运用这种动态化模型的过程和策略,解决了应用系统业务集成中服务的动态化要求等方面的问题。     

基于OSGi面向服务的软件体系架构

为了实现企业应用的基础架构、开发方式、部署方式的统一,文中研究了OSGi服务组件模型. OSGi提供了一种面向服务的组件开发框架,具有高度模块化和动态化特点.根据SOA思想和OSGi技术特性,提出一种基于OSGi的面向服务的软件体系架构,包括基础设施层、服务组件层、服务编排层、应用层,基于J2EE、OSGi等开放技术开发了统一服务架构平台,平台采用SOA架构和标准规范,并通过组件化、图形化为设计、开发、调试、部署、运行、维护提供全生命周期的支持.在实际应用中,文中研究成果实现了企业应用即插即用的模块化管理,能够有效提高软件模块复用能力和复用程度.     

一种面向OSGi的构件化软件再工程方法

面向服务的构件模型可以解决当前大型软件系统难于管理、维护困难和缺乏动态性等问题,而OSGi框架为基于构件系统的服务化开发提供了有力支持。把OSGi作为基础框架对遗留软件系统进行再工程,设计了OSGi化软件的总体框架,提出了软件系统构件化方法,并针对再工程过程中普遍存在的问题给出了相应的解决方案。最后,通过对Web容器再工程的实例研究,验证了面向OSGi的构件化软件再工程方法的有效性。     

基于OSGi的面向服务软件体系结构设计

为了实现企业级应用的基础架构、开发方式和部署方式的统一,文中研究了O SGi服务组件模型。O SGi提供了一种面向服务的组件开发框架,具有高度模块化和动态化特点。根据SOA架构思想和OSGi框架特性,设计一种基于OSGi规范的面向服务的软件体系结构,开发了统一服务架构平台,并通过组件化、图形化为设计、开发及调试等过程提供全生命周期的支持,实现了企业应用即插即用的模块化管理,能够有效提高软件模块复用能力和复用程度。     

整合RTSJ的动态实时OSGi服务部署机制研究

针对当前OSCi规范没有对服务的实时性提出具体标准和详细解决方案的问题,试图将Java实时规范(Real-Time Specification for Java,RTSJ)整合到OSGi架构中,以提供一种在动态实时嵌入式环境下部署实时组件和服务的解决方案。通过分析RTSJ对OSGi框架的影响,针对OSGi事件机制在RTSJ中不能满足实时计算要求的现状,提出了基于RTSJ实时线程的事件机制,解决了OSGi在RTSJ中自适应环境变化所导致的服务之间的实时切换问题,从而确保了基于OSGi架构的实时嵌入式系统在动态不确定环境下的实时性。     

家庭网络环境下基于OSGi的灵活授权

在家庭网络环境下,OSGi平台在控制不同用户进行访问时,授权就显得非常重要。OSGi平台虽然支持基于角色的访问控制(RBAC),但并不支持RBAC模型中的所有功能。本文针对OSGi平台动态部署不足的问题,通过增加了相对角色的概念并使用委托模型激活了其访问控制,提出了一个多样化的访问控制机制,扩展了OSGi平台现有的授权机制。     

基于OSGi和动态QoS管理的家庭网关设计

OSGi规范定义了连接家庭内外的基于服务的框架，它通过家庭网关给终端用户提供各种具体的服务，比如家庭安全控制和智能家居监控等，本文分析了目前基于OSGi的家庭网关存在的服务质量问题，采用了一种动态自适应的QoS管理的解决方法，它在基于OSGi的框架中通过增加任务控制和动态参数转换模块提供灵活的QoS服务，文章给出了具体的设计模型，最后进行了有关的实验测试．     

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.