基于CORBA的CRM开发

随着软件技术和信息技术的发展,CRM逐渐成为企业应用的焦点。以CORBA中间件技术为依托,给出了基于CORBA的CRM应用系统软件架构,并给出了具体的开发流程以及主要难点的解决方案。     

AOP在数据访问中间件中的应用

在开发数据访问中间件中,分布式应用开发是难以避免的。本文运用AOP(Aspect-Offented Programming)建立一种框架执行分布式,并运用于图书馆统一检索平台中。使用AOP的思想在于通过分离关注点,降低中间件开发的难度和复杂度。而且,系统拥有更好的模块化、可扩展性和可维护性。     

RFID室内实时定位系统的数据滤波方法

在射频识别室内实时定位应用中,由于场景的复杂性和定位系统的精度有限,定位系统报告的物品的连续两个位置可能出现在不同的区域内,物品的运动轨迹可能出现穿过墙壁等异常。为此,提出了一种避免这种异常的室内定位系统的数据滤波方法。首先,将场景离散化为一幅“灰度图像”,图像像素表示场景中的点,图像像素的灰度表示不同的区域/房间、墙壁或房门;在定位过程中,将物品的连续两个场景坐标分别映射到两个图像像素,利用连接这两个像素的线段上的像素的“灰度”来判断是否出现穿墙等异常,并修正物品当前在图像上的位置;最后,将图像中的位置映射回场景坐标。实验表明,所提方法快速且高效,能有效避免物品运动轨迹中的异常。     

一种移动定位支撑平台的设计和实现

为了适应移动定位应用对位置信息千差万别的要求，方便移动定位应用的开发，屏蔽各种具体定位系统的实现细节，我们设计并初步实现了面向对象的移动定位支撑平台MLSP。文章重点讨论了MLSP中的定位逻辑模型、定位信息模型及位置信息融合等问题。     

用基于JDBC的中间件实现铁道部DMIS系统的异构分布式数据库访问

本文通过对铁道部DMIS系统现有数据库应用中关键问题的分析,提出了采用基于JDBC的数据访问中间件实现异构分布式数据库访问的思想,并详细讨论了JDBC的工作原理、基于JDBC的数据访问中间件的解决方案和具体实现技术。     

基于中间件的企业计算模型

在分析中间件技术的基础上,提出在J2EE平台上引入SOA架构实现企业计算的模型,并围绕健壮、高效、复用和扩展等性能,重点阐述模型的设计模式、容器实例化组件的思想及组件间的通信技术.     

分布式Web系统结构的研究

本文提出了一种基于MTS／COM 中间件的分布式Web系统结构,通过切割企业逻辑成为企业对象并且在MTS中间件中执行,将整个分布式Web应用系统的工作平均分配在客户端浏览器、Web应用程序服务器、数据库以及中间件中。该结构在解决分布式Web系统的执行效率上获得了较好的效果。     

Using a data-centric event-driven architecture approach in the integration of real-time systems at DTP2

Integration of heterogeneous and distributed systems is a challenging task, because they might be running on different platforms and written with different implementation languages by multiple organizations. Data-centricity and event-driven architecture (EDA) are concepts that help to implement versatile and well-scaling distributed systems.This paper focuses on the implementation of inter-subsystem communication in a prototype distributed remote handling control system developed at Divertor Test Platform 2 (DTP2). The control system consists of a variety of heterogeneous subsystems, including a client–server web application and hard real-time controllers. A standardized middleware solution (Data Distribution Services (DDS)) that supports a data-centric EDA approach is used to integrate the system.One of the greatest challenges in integrating a system with a data-centric EDA approach is in defining the global data space model. The selected middleware is currently only used for non-deterministic communication. For future application, we evaluated the performance of point-to-point communication with and without the presence of additional network load to ensure applicability to real-time systems. We found that, under certain limitations, the middleware can be used for soft real-time communication. Hard real-time use will require more validation with a more suitable environment.     

Kernel software for efficiently building, re-configuring, and distributing an open CNC controller

Several open control architectures have been proposed to enable the incorporation of new technologies into existing CNC controllers. However, complex interfaces and communications among heterogeneous hardware and software platforms have yet to be resolved to reduce development time and cost. We propose a piece of kernel software that facilitates the development, reconfiguration, and distribution of CNC controllers. Assuming that various CNC control functions can be implemented and represented as software modules, the kernel software, acting as middleware, provides bridges between the software modules and the CNC machine by using the process and resource models. A resource model is created for each software module in order to represent its interface specification. A process model is used to represent the invocation sequence of software modules for a particular task received from the operators or other controllers. Based on the implementation of a prototype system, initial results look quite promising. The successful development of the kernel software will reduce the time and cost incurred in the development or modification of an open CNC controller .     

利用软、硬件中间件实现荒废测试仪器的替换

提出通过植入软、硬件中间件的方法实现对现有测试系统中荒废仪器的替换.介绍了国外运用该方法实现对原测试系统进行改造的成功范例,如通过植入硬件中间件实现替换的Winsoft公司的WISE(WinsoftInstrumentSystemEmulator)技术;通过在主控制器中植入软件测试模块适配器的Systems&Electronics公司的STMA(SoftwareTestModuleAdapter)方法以及美军利用IVI(InterchangeableVirtualInstrument)技术对现有LMIS(LockheedMartinInformationSystem)测试系统的升级改造.