医疗卫生局域网内文件检索及共享系统研究

医疗卫生电子文档文件在局域网内进行文件检索、共享操作已经成为了电子化医疗办公的重要环节。本文首 先论述了FTP 技术与应用开发环境,然后从文件共享分级设计、用户操作客户端、系统支撑服务器端三方面分析了医疗卫生局 域网内文件检索及共享系统开发和功能实现。     

XML文档语义检索方法研究

由于半结构文档如XML越来越广泛的应用,在数据库和信息检索领域,对半结构XML数据相似度的研究也变得尤为重要。给定XML文档集D和用户查询q,XML检索即是从D中查找出符合q的XML文档。为了有效地进行XML信息检索,提出了一种新的计算用户查询与XML文档之间相似度的算法。该算法分为三步：基于WordNet对用户查询q进行同义词扩展得到q';将q'和D中的每一篇XML文档都进行数字签名,并通过签名之间的匹配对D进行有效过滤,除去大量不符合用户查询的文档,得到一个文档子集D',[D'?D];对q'与D'中的文档进行精确匹配得到检索结果。     

Oracle XML DB和DB2 pure XML在XML文档存储查询性能方面的比较分析

可扩展标注语言XML在计算机软件的数据接口定义中有着广泛的应用。分析Oracle XML DB和DB2 pure XML关于存储和查询XML文档的技术特点及其实现原理,并通过测试比较,分析这两种技术在存储和查询效率上的差异。在相同XML文档存储负荷下,Oracle XML DB与DB2 pure XML关于存储和查询的耗时之比分别约为2∶1和1.32∶1。     

XML,metadata and efficient knowledge discovery

This paper examines a software tool that assists Defence intelligence analysts in efficient discovery and assimilation of large volumes of information derived from a range of sources. The Health INTelligence System (HINTS) is a prototype that was developed during a collaborative Research and Development project between Computer Sciences Corporation (CSC) Australia and the Defence Science and Technology Organisation (DSTO). The paper discusses how advanced document analysis techniques were used to assists intelligence analysts to manage, analyse and assimilate large volumes of electronic documents. CSC worked with DSTO to integrate a range of Commercial Off The Shelf (COTS) products and several custom built components. The COTS products included a web search engine, a geo-spatial Graphical User Interface, and an eXtensible Markup Language (XML) server. The project team utilised the above technologies to provide a generic design and interface to ensure the prototype is readily configurable to suit a variety of domains.     

基于XSL-FO的XML文档到其他格式文档的转换

XML(eXtensible Stylesheet Language)是目前流行的内容存储格式,而PDF(Portable Document Format)是电子文档的内容载体格式,如何将XML文档转换成PDF及其他一些用于显示的文档格式越来越受到人们的关注。FOP(格式对象处理器Formatting Objects Processor)是由James Tauber开发的一个开源项目,目的是利用XSL-FO将XML文档转换成PDF、TXT、DOC等文档,该文仅以PDF文档为例,介绍如何利用FOP将XML文档转换为其他文档格式。     

基于XML的多Agent系统的研究与实现

作为构建开放和分布式应用系统的一种主流模式,多Agent系统有着广阔的研究前帚和应用价值。在统一建模语言（UML）的支持下,面向Agent的软件工程研究开始走向成熟。一些面向Agent的方法学提供了开发多A—gent系统的工具、应用方法或技术。随着Web服务技术的发展,XML成为Internet上数据组织和交换的标准。现有研究工作所提出的多Agent系统对XML文档提供很少的支持。针对上述问题,设计了一个基于XML的多Agent系统——XMAS。该系统采用带根连通有向图来表示XML文档数据模型,并给出相应的文档模式提取算法,XML文档数据的解析以及对Web服务的相关支持。在数据存储过程中的索引优化使得XMAS在数据查询上具有良好的性能。     

基于Ajax4jsf的XML设计器

研究了一种支持网络化协同设计、满足不懂XML编程用户设计需求的XML设计器.重点考虑其实时、异步的信息交互能力,基于Ajax4jsf框架设计Web接口,为XML文档批量设计提供技术支持.由Ajax引擎在客户端处理用户请求,减少了多用户并发访问情况下的服务器载荷,通过异步模式获取数据,提升了用户的体验效果.基于模型驱动实现数据在数据库和XML文档间的双向映射,通过解析器DOM实现XML文档与其他应用程序的数据转换.开发了XML设计器的原型系统,并测试其信息交互性能.实验表明,所开发的XML设计器的实时异步信息交互能力有了一定的提高.     

Rule-based XML

Legal contracts and litigation documents common to the American legal system were encoded in the eXtensible Markup Language (XML). XML also represents rules about the contracts and litigation procedure. In addition to an expert system tool that allows one to make inferences with that engine, a Graphical User Interface (GUI) generates the XML representing the rules. A rulebase is developed by marking up examples of the XML to be interpreted and the XML to be generated, analogously to Query By Example. This article provides a broader context of the synergy between XML and artificial intelligence by including discussions of: (1) the role of Artificial Intelligence in handling routine litigation; (2) how the use of XML enables legal expert systems to get their `input' without the user having to enter the same information again for the expert system;(3) the advantages of XML markup over other forms of markup for documents; (4) the relationship between XML and ontologies; (5) other projects using XML with rules or legal affairs.     

基于XML的PDF文档内容与结构的表示的实现

在对网络信息资源进行检索、过滤、提取的过程中,对于文档格式的转换是进行信息处理的必然途径。将PDF文档转换为XML文档,在对分析PDF文档的内容和结构方面具有重要意义。论文介绍了从PDF文档向XML文档转换的设计和实现原理。     

A query-oriented XML text summarization for mobile devices

Extensible Markup Language (XML) is a simple, flexible text format derived from SGML, which is originally designed to support large-scale electronic publishing. Nowadays XML plays a fundamental role in the exchange of a wide variety of data on the Web. As XML allows designers to create their own customized tags, enables the definition, transmission, validation, and interpretation of data between applications, devices and organizations, lots of works in soft computing employ XML to take control and responsibility for the information, such as fuzzy markup language, and accordingly there are lots of XML-based data or documents. However, most of mobile and interactive ubiquitous multimedia devices have restricted hardware such as CPU, memory, and display screen. So, it is essential to compress an XML document/element collection to a brief summary before it is delivered to the user according to his/her information need. Query-oriented XML text summarization aims to provide users a brief and readable substitution of the original retrieved documents/elements according to the user’s query, which can relieve users’ reading burden effectively. We propose a query-oriented XML summarization system QXMLSum, which extracts sentences and combines them as a summary based on three kinds of features: user’s queries, the content of XML documents/elements, and the structure of XML documents/elements. Experiments on the IEEE-CS datasets used in Initiative for the Evaluation of XML Retrieval show that the query-oriented XML summary generated by QXMLSum is competitive.     

Rhapsody模型库管理系统设计

介绍飞行控制系统虚拟样机开发平台的体系结构。针对Rhapsody模型,采用ActiveX数据对象技术开发了客户/服务器结构的分布式模型库管理系统,实现了复杂系统虚拟样机设计工程中模型、文档的规范化管理和可重用。该系统由显示层、逻辑层和数据层组成,其中逻辑层包括模型结构管理、文档管理、用户权限管理和系统信息管理四个模块。详细阐述了该系统的体系结构、功能、特点及实现方法,并结合Rhapsody飞行控制系统虚拟样机的设计流程,对模型库管理系统的应用进行了可行性验证。     

面向XML文档检索的索引技术

XML文档的查询索引是当前研究的热点.该文探讨XML文档的索引技术,包括索引结构的设计等问题,给出了一个高效的XML索引方法,采用独特的编码方法,对XML文档及其遵循的DTD同时建立索引,有效支持内容和结构的双重检索;该方法结合了区间编码、倒排表和路径索引的思想,利用DTD结构信息来提高查询的效率.实验结果表明,本文提出的方法可以有效地降低建立XML数据索引的代价,能够缩短查询的响应时间.     

网格GIS及其实现技术*

介绍了网格GIS的体系结构,详细讨论了使用Java语言完成客户与服务器的通信、服务器端实时处理XML文档的关键技术,以及数据库的设计,以实现网格GIS的全过程。     

Examining topic shifts in content-oriented XML retrieval

Content-oriented XML retrieval systems support access to XML repositories by retrieving, in response to user queries, XML document components (XML elements) instead of whole documents. The retrieved XML elements should not only contain information relevant to the query, but also provide the right level of granularity. In INEX, the INitiative for the Evaluation of XML retrieval, a relevant element is defined to be at the right level of granularity if it is exhaustive and specific to the query. Specificity was specifically introduced to capture how focused an element is on the query (i.e., discusses no other irrelevant topics). To score XML elements according to how exhaustive and specific they are given a query, the content and logical structure of XML documents have been widely used. One source of evidence that has led to promising results with respect to retrieval effectiveness is element length. This work aims at examining a new source of evidence deriving from the semantic decomposition of XML documents. We consider that XML documents can be semantically decomposed through the application of a topic segmentation algorithm. Using the semantic decomposition and the logical structure of XML documents, we propose a new source of evidence, the number of topic shifts in an element, to reflect its relevance and more particularly its specificity. This paper has three research objectives. Firstly, we investigate the characteristics of XML elements reflected by their number of topic shifts. Secondly, we compare topic shifts to element length, by incorporating each of them as a feature in a retrieval setting and examining their effects in estimating the relevance of XML elements given a query. Finally, we use the number of topic shifts as evidence for capturing specificity to provide a focused access to XML repositories.     

软件结构化文档编制工具的研究与实现

软件文档的编制是软件工程中的重要环节。本文描述了一个为软件工程实践教学平台所设计的文档工具SEEP-Doc，它采用了可扩展置标语言XML和Microsoft Word字处理工具，保证了文档开发的正确性和完备性，并做到了式样与内容的分离。Schema架构既保证了软件文档遵循相应的文档规范，又确保了可移植性和可扩充性，使用户可以动态加载或重新定义文档的结构而无须改动文档系统。VBA格式转换工具使XML文档可以按一致的：方式得以显现和打印。     

基于XSLT与SVG实现动态矢量WebGIS

设计了一种基于XSLT与SVG的动态矢量WebGIS实现方案。在该方案中,WebGIS服务器通过对客户端请求的分析,对于存储为XML/GML数据库的地理空间数据,通过XML查询进行数据抽取,接着对得到XML/GML文档进行整理,得到该文档对应的元数据,并通过查询GIS应用服务器上的XSL元数据库,得到该文档中元数据所对应的XSL元数据,然后将出现的XSL元数据进行集成,生成一个新的样式表（XSL）,根据这个样式表将XML/GML文档经XSLT转换转化为SVG图像,并经过GZIP压缩将其压缩为SVGZ格式传往客户端,从而实现了地理空间数据的矢量传输和显示。由于根据用户的请求动态下载数据生成包含SVGZ的Web页面传给客户端,所以这种WebGIS不仅安全可靠也具有较高的效率。     

基于贝叶斯网络的XML文档查询模型

目前XML查询语言及查询界面对Web用户过于复杂,该文描述了一种XML文档索引机制,在此基础上建立了一个通用的贝叶斯网络查询模型。用户只需在交互界面输入自然语言描述的查询,系统就能对其实现基于语义的构造,由它生成多个结构化查询;对这些查询建立贝叶斯网络,计算查询在给定文档下的概率,选择概率最大的前3个查询提交给系统执行。     

Xstream: a middleware for streaming XML contents over wireless environments

XML (extensible Markup Language) has been developed and deployed by domain-specific standardization bodies and commercial companies. Studies have been conducted on a wide variety of issues encompassing XML. In the use of XML for wireless computing, the focus has been on investigating ways to efficiently represent XML data for transmission over a wireless environment. We propose a middleware, Xstream (XML Streaming), for efficiently streaming XML contents over a wireless environment by leveraging the rich semantics and structural characteristics of XML documents and by flexibly managing units containing fragments of data into autonomous units, known as XDU (Xstream Data Unit) fragments. The concept of an XDU is fundamental to the operation of Xstream. It provides for the efficient transfer of documents across a wireless link and allows other issues and challenges pertaining to wireless transmission to be addressed. By fragmenting and organizing an XML document into XDU fragments, we are able to incrementally send fragments across a wireless link, while the receiver is able to perform look-ahead processing of the document without having to wait for the entire document to be downloaded. We propose a fragmenting strategy based on the value of the wireless link's Maximum Transfer Units (MTUs). In addition, we present and evaluate several packetizing strategies, i.e., strategies wherein a collection of XDUs are grouped into a packet to optimize packet delivery and processing. At the receiving end of this process, a reassembly strategy incrementally reconstructs the XML document as XDU fragments are being received, thereby facilitating client application implementation of look-ahead processing.