校园网Web服务器的安全配置及防范对策

随着网络技术的快速发展,校园网Web服务器的安全越来越受到人们的重视,该文从Windows Server 2003操作系统、IIS6、ASP.NET和SQL Server 2000数据库管理系统等多方面详细阐述了校园网Web服务器的安全配置,并提出了一些防范对策。     

基于搜索的面向路径字符串测试数据自动生成方法

针对字符串测试数据自动生成,讨论了字符串间的距离,将不满足路径条件的字符串谓词表示成一个实值目标函数;利用快速下降搜索算法实施目标函数极小化,实现了基于搜索的面向路径字符串测试数据自动生成方法;探讨了其测试数据生成效率与初始输入、路径处理顺序之间的关系,并与遗传算法等几种算法进行了比较．实验结果表明：该方法是一种更经济有效的测试数据生成方法．     

基于MDA的Web服务组合的研究及应用

随着已有Web服务数量的不断增加,如何利用这些现有的Web服务创建新的更复杂的Web服务成为一项新的研究课题。特别地,利用MDA进行Web服务合成已经成为研究的热点。提出了一种基于模型驱动架构的Web服务组合方法,将模型驱动软件开发方法学应用到Web服务组合中。针对WSDL语言给出了一个UML Profile for WSDL来建立与WSDL平台相关的静态结构模型,并给出了与WSDL平台相关的静态结构模型和WSDL语言之间的模型转化规则。并通过一个旅行代理服务的实例说明了方法的应用情况,验证了方法的可行性。     

Design and Configuration Rationales for Digital Video Storage and Delivery Systems

Recent advances in computing technology have brought multimedia information processing to prominence. The ability to digitize, store, retrieve, process, and transport analog information in digital form has changed the dimensions of information handling. Several architectural and network configurations have been proposed for efficient and reliable digital video delivery systems. However, these proposals succeed only in addressing subsets of the whole problem. In this paper, we discuss the characteristics of video services. These include Cable Television, Pay-Per-View, and Video Repository Centers. We also discuss requirements for Video On Demand services. With respect to these video services, we analyze two important video properties: image quality and response time. We discuss and present configurations of a Digital Video Delivery System (DVDS) from three general system components - servers, clients, and connectivities. Pertinent issues in developing each component are also analyzed. We also present an architecture of a DVDS that can support the various functionalities that exist in the various video services. Lastly, we discuss data allocation strategies which impact performance of interactive video on demand (IVOD). We present preliminary results from a study using a limited form of mirroring to support high performance IVOD.     

受电弓离线电弧所引起的电磁干扰测试及分析

根据GB／T-24338-2（轨道交通电磁兼容）标准,提出了离线电弧所产生的电磁干扰的测试方案,并选择了在成灌高铁上实施测试。在车下进行EMI标准测试、外场步进EMI测试,并将测试结果分别与GB／T-24338和国家环保标准GB9175-88进行了对比分析,结果表明5倍冗余度下的动车环境磁场强度在特殊工业环境许可范围内。     

基于CIDOC概念参考模型的Web服务注释

在Web服务所提供的基本功能的基础上,应用语义注释的思想,给出一种对Web服务进行语义说明的方法。应用CIDOC CRM标准对Web数据规范进行注释,可为该规范加入语义信息,反映数据的含义,并揭示出数据之间的层次关系,从而使Web服务使用者更好地理解数据,并将所获取的数据准确地应用到数据处理中。     

一种障碍空间中不确定对象的连续最近邻查询方法

近年来,基于位置的服务获得了越来越广泛的关注,其中最近邻查询是最常用的一种查询方式.测量手段的不准确性以及数据本身的性质导致不确定性在位置数据中普遍存在,这种不确定性会对最近邻查询结果产生影响.空间中障碍物的存在也给空间数据查询带来了挑战.文中研究存在障碍物的空间中不确定对象连续最近邻查询的处理方法,设计了一种剪枝策略大幅降低需要计算的不确定对象数目,并进一步提出了障碍空间中不确定对象最近邻查询安全区域的概念及安全区域生成算法.设计了安全区域的索引存储方法.实验结果表明,文章所提出的方法具有良好的效率和可扩展性.     

Strategy, networks and systems in the global translation services market

The globalisation of markets has led to an increased demand for language translation services that support and enable communication between economic partners. For example, technical documents, software systems, business documents and web sites all need to be translated into multiple languages for individual national markets, and the information that they contain changes periodically. This paper sets out a theoretical framework that describes the architectures of business processes within and between separate firms that are used to support the delivery and management of services. This is done by coordinating the fit between externally generated problem complexity, from customers, and the internally generated complexity of different potential network configuration solutions. The theoretical framework is an architecture of how complexity is generated and managed at the different structural levels and across the different processual stages of an industry. A case study of thebigword, a major international translation services company, illustrates how the framework is applied in practice. The case study analyses the implementation of an electronic market platform which enables the coordination of the different stakeholders involved in the translation services market. These stakeholders include translators, translation services companies and their clients in a global business network.     

移动中间件在ERP系统中的应用

鉴于J2ME和Web Services技术在部署企业移动应用上的优势,本文在深入研究这两种技术的基础上结合实际项目构建了一个企业移动应用系统-移动ERP。它面向企业的工作人员,让他们随时随地查询企业进、销、存等信息,并可以对信息进行审批,实现了移动终端和企业信息的交互,具有一定的实用价值,同时验证了用这两种技术构建企业移动应用程序的可行性。