中间件Tuxedo在MES应用中数据传输的研究

简要介绍了流程工业MES体系结构和Tuxedo数据传输的类型,并对Tuxedo的FML缓冲格式进行了研究。根据MES业务的要求,用面 向对象的方法及相关技术,将Tuxedo的数据存取、传输和Service调用进行了封装,完成了ATMI类的实现,并在项目中成功地应用。     

采用中间件在MIDP移动设备上实现非HTTP协议

CLDC/MIDP的移动设备都支持HTTP协议，对于HTTP之外的协议是否支持要视具体平台而定，这使得基于非HTTP协议的应用无法在所有移动设备上通用。通过在WEB服务器端部署中间件，将移动设备的网络功能后移到服务器端，从而使得针对其他协议的应用通过HTTP协议间接实现，达到一次编写多次使用的目的，而且，将MIDLET的大部分处理交由中间件处理可以提高系统效率，增强网络安全。     

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。     

一种基于CCM构件模型的计算网格平台

如何聚合网络中分布异构的计算资源来解决大规模的科学计算问题,和如何减少并行程序设计的复杂性,一直是网格计算研究的难点之一。文章提出了一种基于CORBA构件技术的计算网格新思想,构造了一个计算网格的模型(CCGM)。该模型能够充分地利用构件技术带来的可组装和易管理的特性来形成网格计算。并通过问题的抽象定义和使用ParIDL工具将问题的定义映射到CCGM之上,简化了计算网格应用的开发。通过测试和分析CCG(ComponentbasedComputationalGrid)系统,表明CCG系统具有较好的加速比。     

PPACOM中间件在西门子历史数据库中的应用

开发基于西门子PPACOM组件的历史数据访问高效解决方案和可重用软件组件PPACOMLIB,经过系统的运行证明,SIMATIC IT Historian冗余服务运行稳定,基于PPACOM组件的数据查询方式高效方便。     

A secure and quality-aware prototypical architecture for the Internet of Things

The increasing diffusion of services enabled by Internet of Things (IoT) technologies raises several risks associated to security and data quality. Together with the high number of heterogeneous interconnected devices, this creates scalability issues, thereby calling for a flexible middleware platform able to deal with both security threats and data quality issues in a dynamic IoT environment. In this paper a lightweight and cross-domain prototype of a distributed architecture for IoT is presented, providing minimum data caching functionality and in-memory data processing. A number of supporting algorithms for the assessment of data quality and security are presented and discussed. In the presented system, users can request services on the basis of a publish/subscribe mechanism, data from IoT devices being filtered according to users requirements in terms of security and quality. The prototype is validated in an experimental setting characterized by the usage of real-time open data feeds presenting different levels of reliability, quality and security.     

Towards a trust evaluation middleware for cloud service selection

With the advent of cloud computing, employing various cloud services to build highly reliable cloud applications has become increasingly popular. The trustworthiness of cloud services is a critical issue that hinders the development of cloud applications, and thus is an urgently-required research problem. Previous studies evaluate trustworthiness of services via either QoS monitoring mechanisms or user feedback ratings, while seldom they combine both of them for enhancing service trust evaluation. This paper proposes a trustworthy selection framework for cloud service selection, named TRUSS. Aiming at developing an effective trust evaluation middleware for TRUSS, we propose an integrated trust evaluation method via combining objective trust assessment and subjective trust assessment. The objective trust assessment is based on QoS monitoring, while the subjective trust assessment is based on user feedback ratings. Experiments conducted using a synthesized dataset show that our proposed method significantly outperforms the other trust and reputation methods.     

面向智能家居的数据库中间件软件设计

文章旨在将不同无线网络、不同通信格式的设备结合起来,从而构建一个面向智能家居的异构网络控制系统。针对不同协议、不同厂家的无线设备难以互通互联、统一控制的问题,本文提出了一种基于Web的中间件软件架构。该中间件进行数据格式转换的同时还能结合Web界面控制设备呈现给用户。上层控制端通过对数据库的操作来实现对不同通信网络智能家居设备的控制和联动。异构无线网络-ARM网关-数据库中间件-控制端的架构能够使用户在避免接触底层硬件系统和软件编程的情况下,快速组网灵活控制智能家居设备,增强了智能家居的系统的易用性。     

基于混合通信模式的消息中间件设计与实现

将发布／订阅和点对点两种消息通信模式相结合,提出并设计了一种基于混合通信模式的消息中间件系统,并针对系统实现中的关键问题提出了相应的解决策略。测试结果表明,该系统综合了两种通信模式的优点,在保证灵活性和可靠性的同时,消息传输效率也得到了有效提高。     

数据访问中间件系统设计与实现

为了解决大型系统开发过程中数据访问的一致性、实时性以及数据透明性等问题,该文拓展了数据访问中间件的概念,重点介绍了一个能够适应分布式信息系统开发应用需要的数据访问中间件的设计方案以及软件实现技术。