一种基于扩展UML的企业应用软件PIM模型

针对UML在企业应用软件建模中可用性差和效率低的问题,提出一种基于扩展UML的企业应用软件PIM模型.通过对企业应用软件特点的分析,建立了一个以业务对象为中心的多视图集成PIM模型,对UML进行扩展,在它的元模型中增加了描述企业应用软件PIM模型中的概念及其之间关系的元类、版型和标记,并采用包对这些概念和关系进行不同视点的划分.基于扩展UML的企业应用软件PIM模型通过业务对象的丰富语义实现了UML中各种图之间基于语义的集成,改善了UML的可用性,提高了企业应用软件的建模效率.结果表明:通过实际案例验证了该模型的可行性和有效性.     

Sustainable interoperability on space mission feasibility studies

The evolution of ICT towards fast and robust data exchange promoted the blooming of successful technical and business concepts like cloud computing and virtualisation of enterprise assets. The escalation of service providers enabled the specialisation of enterprises (particularly SMEs) and the building of provider networks. This move from enterprise-concentric to service-dispersed strategies is leading to concerns about reaching and maintaining the interoperability between customer–provider pairs and their associated business networks. This is particularly true in the aerospace industry: a highly-competitive and demanding business supported by numerous applications, which may be general-purposed, specific, proprietary or open-sourced, all needing to be interoperable with the lowest impact on the business itself. This paper addresses the need for improving the sustainability of enterprise interoperability via the application of negotiations, with the objective of reducing the impact of changes and achieving the best solutions in the interoperability between the enterprises and their surrounding environment. It proposes a framework that features a negotiation mechanism for the management of changes towards the sustainability of the seamless business-to-business interactions, and describes its application on the real business case of the ESA-CDF space mission feasibility studies.     

JSP页面启动Java应用程序的原理与实现

由JSP页面启动Java应用程序在Web应用中有时可能是一件很有意义的工作。在某些专用的Web应用系统中,服务器往往既要响应客户端的页面请求,又要做一些后台的处理工作。有些处理可能还需要人工的参与和操作,比如启动和关闭一个Java后台程序等等。通过用户自定义的标签,在标签的处理类中加入启动Java程序的代码,同时对Java程序作必要的调整,即可实现由JSP页面启动Java程序,可以使所有管理和使用系统的操作全部通过JSP页面来完成。当这样的Java程序很多时,会给管理、维护和使用系统带来很大的便利,对于不熟悉Java语言的用户尤为如此。实现了对系统的集中化管理,提高了系统的集成度和专业化程度。这种方法还有一个明显的优点就是它与平台无关。     

Validating a size measure for effort estimation in model-driven Web development

Web development is moving towards model-driven processes whose goal is the development of Web applications at a higher level of abstraction based on models and model transformations. This brings new opportunities to the Web project manager to make early estimates of the size and the effort required to produce Web applications based on their conceptual models. In the last few years, several studies for size and effort estimation have been performed. However, there are no studies regarding effort estimation in model-driven Web development. In this paper, we present the validation of a model-based size measure (OO-HFP) for Web effort estimation in the context of a model-driven Web development method. The validation is performed by comparing the prediction accuracy that OO-HFP provides with the accuracy provided by the standard function point analysis (FPA) method. The results of the study (using industrial data gathered from 31 Web projects) show that the effort estimates obtained for projects that are sized using OO-HFP are more accurate than the effort estimates obtained using the standard FPA method. This suggests that by following a model-driven development approach, the size measure obtained at the conceptual model of a Web application can be considered a suitable predictor of effort.     

跨平台嵌入式开发环境研究

本文主要研究了几个有代表性的嵌入式开发平台,并在这个基础上提出了代码平台无关的解决方法,主要解决由于平台的多样性带来跨平台开发的困难,通过研究提出一个跨平台的嵌入式开发的概念,即通过封装了平台底层提供的系统函数来使得基于操作系统上的开发实现平台无关,减少了由于平台变化带来的移植的问题。     

跨平台实时数据库中间件的研究

数据库中间件是电力调度自动化平台的核心技术,目前国内尚没有很好地同时解决数据库中间件的跨平台、实时性、扩展性三方面问题的技术方案。文章介绍了在SpanOS-2000系统中使用最新Java技术来解决此问题的尝试,试验证明,该方案可行而且有很大发展潜力。     

平台无关的访问控制框架研究与实现

为了使开发的访问控制模块可以在不同的平台上实施,通过总结不同平台异同点以及现有安全系统中访问控制实现方法,抽象出访问控制机制对平台的依赖,设计了一个平台无关灵活的访问控制框架PIFAC,且已经被实施在Windows、Linux以及Rtems系统上。