基于电子商务网络应用体系的中间件构架研究

由于现有应用的不断扩充和新应用形式的不断增加,迫使电子商务网络应用体系越来越复杂,因而起着中间平台作用的中间件应运而生,同时中间件技术也是伴随电子商务应用的深化不断发展的。通过电子商务网络应用体系中间件构架的组成的分析,阐述了中间件技术在通信、系统应用开发及管理等方面的作用及关键技术。     

因特网体系结构和QoS机制

因特网体系结构所应用的端到端原则保证了因特网的灵活性、开放性和通用型,促进了因特网的快速发展。然而,传统的尽力而为的服务模型不能为日益增长的多媒体实时业务提供有效的QoS保障。在因特网本身的体系结构基础上构建QoS机制面临诸多困难。讨论因特网体系结构和QoS机制各自的概念和关系。     

语义Web和语义网格及数据资源整合的探讨

目前,许多电子政务系统面临着一个共同的问题,这就是所谓的＂信息孤岛＂问题,解决该问题的关键是如何将现有数据资源进行有效的整合。而语义网格理论的提出,为这一难题的解决提供了一个新的思路。应用语义网格理论,针对出租汽车管理信息化的应用需求,构造语义网格模型Tx-Grid,并且讨论一种利用本体整合分布式异构数据库资源的机制,有效地解决这一问题。     

基于SOA的制造业MRPⅡ系统的研究与实现

随着制造资源计划(MRPⅡ)在制造行业的推广和应用,如何设计一个业务敏捷的MRPⅡ系统已经成为一种发展趋势。本文依据某制造企业的实际情况,结合面向服务构架(SOA)理念,设计出一种基于SOA的MRPⅡ系统的实现方案,着重研究了生产管理模块的设计与实现,详细分析生产管理的主要模块如MRP计算等,最后详细介绍了该系统4层架构的实现。     

基于遗传算法的TSP问题求解算法及其系统

TSP问题为组合优化中的经典的NP完全问题。针对这一问题,首先设计了基于遗传算法的求解算法,包括编码设计、适应度函数选择、终止条件设定、选择算子设定、交叉算子设定以及变异算子设定等,给出了基于遗传算法求解TSP问题的一般性流程,然后设计并实现了基于遗传算法的TSP问题求解系统,给出了求解系统的体系结构,并给出了求解系统基于Ja-va语言的实现机制,最后通过实验结果的分析,表明了算法具有较好的寻优性能,系统具有较好的实用性。     

集成企业遗留系统到SOA方法研究

首先综述了SOA的思想与特点,以及与其相关的两种技术——Web服务和企业服务总线。在此基础上,讨论了基于SOA集成遗留系统问题,包括基于SOA的集成框架,制订集成目标与路线图,代码剥离与封装,构造虚拟组件和Web服务等几个方面。     

功耗限制下SOC互联总线测试完整性故障的结构的优化

本文提出了一种SOC互联总线测试完整性故障的结构优化方法,本方法是在功耗限制下通过分配TAM使测试时间最小,从而优化了系统测试结构。本文先对测试测试集进行二维压缩分割SI测试集成几个SI组初始化测试结构,为每个核分配一位TAM,通过为每个的TAM进行计算后找出关键TAM,再通过在功耗限制下,反复分配空闲TAM给关键TAM和共享TAM的方法进行测试时间的减少。对ITC‘02的试验结果表明,本方法能在功耗限制下大大减少了SOC测试时间。     

Agile Spectrum Imaging: Programmable Wavelength Modulation for Cameras and Projectors

We advocate the use of quickly‐adjustable, computer‐controlled color spectra in photography, lighting and displays. We present an optical relay system that allows mechanical or electronic color spectrum control and use it to modify a conventional camera and projector. We use a diffraction grating to disperse the rays into different colors, and introduce a mask (or LCD/DMD) in the optical path to modulate the spectrum. We analyze the trade‐offs and limitations of this design, and demonstrate its use in a camera, projector and light source. We propose applications such as adaptive color primaries, metamer detection, scene contrast enhancement, photographing fluorescent objects, and high dynamic range photography using spectrum modulation.     

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.     

A survey on the history of transaction management: from flat to grid transactions

Transactions have been around since the Seventies to provide reliable information processing in automated information systems. Originally developed for simple ‘debit-credit’ style database operations in centralized systems, they have moved into much more complex application domains including aspects like distribution, process-orientation and loose coupling. The amount of published research work on transactions is huge and a number of overview papers and books already exist. A concise historic analysis providing an overview of the various phases of development of transaction models and mechanisms in the context of growing complexity of application domains is still missing, however. To fill this gap, this paper presents a historic overview of transaction models organized in several ‘transaction management eras’, thereby investigating numerous transaction models ranging from the classical flat transactions, via advanced and workflow transactions to the Web Services and Grid transaction models. The key concepts and techniques with respect to transaction management are investigated. Placing well-known research efforts in historical perspective reveals specific trends and developments in the area of transaction management. As such, this paper provides a comprehensive, structured overview of developments in the area.