基于xUML的MDA实现

MDA是一种以模型为中心的新的软件开发模式。可执行UML（xUML）是UML的一个扩展,通过在UML中加入精确的可执行的动作语义．使得建模者可以生成可执行的独立于平台的模型,并直接从该模型生成代码。该文将xUML与动作语言OAL结合讨论．目标是建立可执行的模型,使用这些模型最终可以为目标系统生成高质量的代码,并用一个实例说明了该方法的使用。     

基于普适服务的代码自动生成研究

基于MDA方法,使用UML profile建立企业应用模型,并应用模型转换工具实现代码自动生成,通过修改PSM模型自动实现代码的修改。详细探讨了PS_.NET UML profile的构成和转换过程,通过应用实例,证明该转换方法可以很好地应用于企业应用系统开发,提高开发效率,减少开发代价和维护。     

基于Hermite多项式的UWB脉冲形状调制

针对使用窄脉冲传输数据的超宽带系统,依据修正Hermite函数的正交、无直流分量等特性,提出了一种基于正交UWB脉冲的PSM超宽带系统.仿真结果表明该设计能改善系统性能,降低误码率.     

基于MDA的移动应用开发框架

手机应用软件开发需要耗费大量时间用于跨平台的移植,但该过程通常是重复的编码工作。为此,提出一种基于模型驱动架构的手机应用软件开发框架(MDMF)。利用模板将抽象出的平台无关模型转换为多个手机平台上的特定模型,进而生成对应的应用程序。应用结果表明了MDMF的有效性。     

模型驱动体系结构研究

模型驱动体系结构(MDA)是一种广泛用于多种学科领域的系统设计方法,能有效提高设计效率,解决了面向对象设计过程中模型设计与代码实现不符的问题。通过对文献的研究,分析了MDA关键技术的发展现状,并展望MDA在未来发展趋势。     

基于Polyflow的缓凝砂浆在螺旋槽中的流场模拟

针对缓凝预应力筋包覆装置连续作业的可靠性问题,在包覆试验研究基础上,采用流体力学和流变学理论与计算方法,运用Polyflow等软件,建立了螺旋输送的物理模型、几何模型以及有限元网格模型,结合假设和边界条件,对宾汉姆流体的缓凝砂浆在螺旋槽内的流动和变形进行了计算流体力学（CFD）模拟,并得到了可视化流场。分析结果表明,在不同螺杆转速下,缓凝砂浆在螺槽中出现完全流动状态或＂塞流＂的固体输送状态,验证了包覆试验现象,同时为机件的优化与设计提供了依据。     

Development of a novel starch-derived porous silica monolith for enhancing the dissolution rate of poorly water soluble drug

A novel starch-derived porous silica monolith (PSM) and porous starch foam (PSF) were developed as a carrier in order to improve the dissolution of lovastatin. PSM was prepared by the starch gel template method and PSF was prepared by the solvent exchange method. The morphology and structure of PSM and PSF were characterized by scanning electron microscopy (SEM) and nitrogen adsorption/desorption analysis. Lovastatin was loaded into PSM and PSF by immersion/solvent evaporation. Nano-pore spatial confinement effect on the drug dissolution was systematically studied by SEM, Fourier transform infrared spectroscopy (FTIR), thermogravametric analysis (TGA), x-ray powder diffraction (XRPD), differential scanning calorimetry (DSC), and in-vitro drug dissolution studies. Lovastatin adsorbed in PSM was amorphous and lovastatin absorbed on PSF was partially present as microcrystal in the pores of PSF and partially in crystalline form distributed on the surface of PSF. PSM and PSF allowed immediate release of lovastatin and enhanced the dissolution rate. These results provide important information about the mechanism of drug adsorption and release. Accordingly, PSM and PSF have a promising future as a vehicle for the oral delivery of poorly water soluble drugs. Moreover, the effect of PSM is better than that of PSF.     

模型驱动体系结构MDA的实例研究--病人观察系统的PIM模型建立和PIM到关系PSM模型转换

MDA是解决基于不同中间件系统的集成问题,它将不同的系统都结构化成PIM和PSM,并针对不同实现技术与平台制订多个映射规则,然后通过这些映射规则及辅助工具将PIM转换成PSM.本文应用MDA对病人观察系统进行PIM建模,并提出了一种PIM到关系数据库PSM的转换方法.     

基于MDA的社区电子服务开发平台设计与实现

通过对当前社区电子服务系统的现状进行分析,现有系统存在性能瓶颈,网络延迟,新业务融合慢等问题,设计了一个符合跨操作系统和网络平台、跨编程环境的、利于与现有系统集成、灵活可伸缩、支持系统快速重构及新服务快速接入的开放性社区电子服务平台。同时鉴于传统软件开发的各种弊端,在对OMG组织提出的MDA（Model Driven Architecture）架构思想进行了详细的分析和研究基础上,构建了社区电子服务开发平台的PIM和PSM,最终快速实现了一个新的社区电子服务开发平台。     

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.