XML数据动态更新的索引技术

本文提出一种新的支持XML数据动态更新的编码方案（DUCX）,并建立了支持XML数据动态更新的索引,提高了查询效率,支持单支、多支查询和多文档。     

XML数据库模式匹配算法研究

XML文档采用了树型的数据模型,对其查询通常是用带有选择谓词的模式树在XML数据中进行匹配,因此找出XML文档中所有符合模式树结构的元素是XML查询处理的核心操作.本文提出了一种新的XML模式匹配算法,算法思想是利用第一个结点的编码和最后一个结点的编码得到中间结点,用中间结点的begin与DList表结点的begin比较进行连接.     

XML文档相似度量应用研究

为了满足基于Web的XML数据信息的近似搜索、数据挖掘、信息分类以及数据交换的需求,分析了XML文档相似性度量方法一集合度量方法、线性度量方法和代价度量方法。提出基于权重代价的机器学习的XML文档相似性度量算法。实验表明该算法扩展了XML文档查询范围,提高了文档的查全率和查准率。     

基于Dewey编码的XML多重索引

与标准的方法XQuery查询语言不同,XML文档的关键字查询能使用户方便地访问XML数据,不必考虑数据复杂模式和掌握复杂查询描述语言。文章对关键字查询中索引技术进行研究,提出了一种基于Dewey编码的查询索引进行解决,以综合分析XML数据的值信息和结构信息,达到子树返回和路径返回的精确查询的目标。     

XML技术剖析及其查询优化

结合XML技术及半结构化数据索引和Lore系统中的索引结构，提出了一种特殊的XML数据索引建立的方法，及利用索引实现对XML查询的优化。     

统一资源管理系统中查询模块的设计与实现

针对URMS的特点,在其查询组件中设计了一种基于流的XML查询算法.详细地介绍了由查询表达式构造查询自动机的步骤;实现了一个基于流的XML文档查询系统的原型.通过实验表明,提出的方法能够适应XML流的查询,在内存利用率上优于传统的基于内存的XML查询算法.     

基于元数据集成检索系统的设计与实现

文章应用XML Schema设计元数据字典的通用模型,建立一个XML统一逻辑视图,使用XQuery查询语言对XML文档进行查询处理,为用户提供一个统一的查询接口,实现对分布式异构数据源的透明访问和集成检索,并给出了主要环节的实现方法.     

基于XML电子病历的索引策略研究与实现

为了提高XML电子病历系统查询和处理时间,采用倒排索引方法,引入LRU替换算法,并引进更新策略。该索引策略花费少量空间索引,但却适应了电子病历的实时更新,大大地提高了查询和处理时间。给出了此策略实现算法的同时,通过实验验证了它的有效性和优越性。     

SXKS:一种基于栈的XML关键词查询算法

随着XML在数据交换和发布等领域的广泛应用,XML数据的查询问题变得越来越重要,尤其是对于XML数据的关键词查询更是当今数据处理领域的一个难点.本文提出了一种基于栈的XML关键词查询算法SXKS,该算法依照关键词对XML文档进行搜索,返回的结果是叶子结点分别取值为各个关键词的带权值的最小关键树DMKT,DMKT中包含所有的关键词并且这些关键词与叶子结点是一一对应的.那么,每一个DMKT就对应一个符合搜索条件的查询记录.     

XML文档与关系数据库的相互转换方法研究

XML文档数据的存储是目前XML相关研究的热点.提出一种基于模型映射的将XML文档中的数据映射到关系数据库中存储的方法,关系数据库中的数据亦可反向映射重新生成对应的XML文档,给出了映射的算法实现.实验结果表明,该映射方法生成的表结构简单且保留了XML文档的结构信息,能够实现XML文档与关系数据库的相互转换.     

卡思卡特城堡

It is worthy of noting that, whilst Crookston Castle witnessed the earlier and happier portion of Mary's variegated life,     

不同的吃喝玩乐

一、吃和喝吃苹果 eat an apple, 吃药 take medicine,吃糖 have some sweets,吃饭 have one's meals,吃馆子 dine out,吃惊 be surprised/     

漏洞百出的教育

Many college freshmen arrive woefully unprepared to do college work, and as disadvantaged populations continue to grow, the share of the American work force that has made it through college is expected to plummet. Many experts blame that educational failure not just on high schools but also on colleges. School & College, a special report by The Chronicle, looks at efforts to fix the system. What reforms would better prepare students for college? What should schools and colleges be doing differently? How should state and federal officials help?     

只要努力,不要后悔

There are numbers of crossroads on our long and unpredictable life journey where we totally have no idea about which direction to choose. No matter what our decision is, we should not turn back, but face the music and go ahead instead. I am this kind of girl who always does try without regretting, one example is how I dealt with my love.     

浅谈移民问题

Migration occurs behind a variety of reasons and has a great effect on the whole world. People may migrate in order to improve their economic situation, or in order to escape civil strife, persecution, and environmental disasters. The impact of migration is complex, bringing both benefits anddisadvantages. This paper briefly talks about the causes of migration, the allocation of benefits, and the ways in which individual countries and the international community deal with this important subject.     

Sister Carrie, an Adherent of Desires

Sister Carrie is one of the most controversial characters in American literature.Thought as a "fallen woman" firstly,she was defined as a "new woman" by some critics later. However, by digging into the motivaton behind the whole process of Carrie's "success", the relationship between Carrie and her creator (the author), the social conditions of then American, it can be found that Carrie has never been free-standing on her thought and she has never found her real-sdf even after becoming a famous actress. In a society dominated by mass consumerism Carrie is only an adherent of her own desires. She also is a representative of all those country girls flooded into cities, a symbol and a sacrifice of the urbanization of America in a time countryside was overcome by cities.     

Improvement of one-cycle controller by use of proportional integral differential controller

1.IntroductionOne-cyclecontrolmethod,whichwasproposedaboutonedecadeago[1],hasbecomeanattractivemethodinspecialfieldssuchaspowerfactorcorrection[2-6],switchingamplifiers[7,8],etc.Themainideaofthiscontrollerisbasedonintegrationofdiodevoltageinone-cycleandforcesittobeexactlyequaltothereferencevalue.Themainadvantageofthiscontrollerisitsrealtimeabilitytorejectthevariationofinputvoltage[1].Despitethisgreatability,ithasnogoodperformancesinrejectingofloaddisturbanceandfollowingreferencecommands.Espec…     

库克斯顿城堡

城堡, 是欧洲典型的建筑之一, 每个城堡都有一个美丽的传说或是一段历史。从本期开始, 我们将推出“城堡之旅”, 带各位读者去浏览、观赏欧洲各地的城堡, 开始一段文化与历史的旅途!     

胡主席在印度,我却在中国

Today, Sunday morning, I sit thinking and typing at my computer. My thoughts are in my homeland, India and my body is in China. The body is here and mind there for a good reason. Mr. Hu is president and I am resident and both are in each other's countries (what a difference the absence of one small letter makes!). Mr. Hu will return in a few days and I will stay on longer.