共查询到20条相似文献，搜索用时 796 毫秒
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介绍了语义Web的定义及其体系结构,以及实现语义Web的三大关键技术XML、RDF和Ontology(OWL),然后分析了如何使用这三大技术来描述Web信息的语义。 相似文献
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通常Web服务器能够对静态资源进行缓存设置,对动态资源无能为力。而动态网站在当今的Web应用系统中所占的比重越来越大。本文基于HTTP协议原理,实现了一种动态Web资源缓存机制,该机制具有应用效率上的高效性以及实现上的简单性,适用于任何基于HTTP协议的Web应用系统和网站。 相似文献
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元数据是对数字化地方文献资源进行组织和检索的基本信息，本文叙述了都柏林核心元数据的概念、特征、作用，并详细介绍了在RDF／XML框架下使用DC元数据对数字化地方文献资源进行描述的具体实现。 相似文献
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胡青 《湖北第二师范学院学报》2011,(2):62-65
本文基于语义桌面技术,提出类XPath的语义目录技术。首先将个人电脑的桌面资源转化成通过RDF(S)统一描述的语义资源。接着借助词汇-概念相似度计算及语义映射技术,将用户的类XPath的资源请求操作映射到RDF图。最后,形成语义级的类XPath的资源请求形式。通过类XPath的语义目录机制,一方面保持了用户传统分类目录结构的资源管理方式,另一方面,增强了本地资源的资源语义关联度,实现了本地资源的语义级分类和语义级资源定位,满足了个人电脑用户高效管理资源的要求。 相似文献
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本文讨论基于Web数据库技术的远程咨询型教学系统实现的关键技术，着重分析了Web数据库系统的工作原理，分布式PowerBuilder应用程序的工作机制，分布式PowerBuilder应用与Web技术结合实现Web数据库系统的途径和方法，以及有关实现远程咨询型教学系统的注意事项。 相似文献
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许红梅 《十堰职业技术学院学报》2010,23(2):107-109
语义Web是未来web的发展方向,是信息可以被机器理解和使用的新的信息环境,语义Web的出现彻底改变了web上信息的组织方式,对于各种网络信息应用都将产生巨大影响。本文首先对Semantic Web的概况进行了简要介绍,然后详细分析了语义Web体系的主要支持技术(XML RDF),最后探讨了语义Web技术对网络信息检索的影响。 相似文献
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对元数据的概念、相关格式、携带工具（RDF）,以及XML的相关概念、其主要应用资源描述框架（RDF）进行了探讨。并介绍了元数据在数字图书馆和数字博物馆中的应用。 相似文献
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针对教学单位教育资源分布的特点,以带有主节点的P2P（P2P with Super-peer）网络为基本架构;以RDF／S为资源描述结构。构建了一个教育资源整合平台。解决了基于关系数据模式的虚拟RDF视图的构建;解决了SPARQL查询向SQL查询的转换,从而实现了异构教学资源之间的跨模式、跨语义的集成。为解决数据孤岛问题和进一步发布资源的链接数据作好准备,丰富了资源的价值。 相似文献
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《海外英语》2007,(5):10-11
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? 相似文献
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邱崇丙 《唐山师范学院学报》2014,(1):21-23
汉字的六书,《说文》对“转注”一类,语焉不详。后世学者提及转注,也仅限于许慎所举出的例字。《汉字例说》一文,作者从转注的角度综合考虑,对部分现代常用字作了分析,跟传统的解释有所不同。希望能抛砖引玉,互相切磋,以推进学术研究。 相似文献
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《海外英语》2007,(4):36
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. 相似文献
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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. 相似文献
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Rachel Zupek 《海外英语》2007,(11):40-41
我们绝大部分人都同意一件事情——我们喜欢金钱。但是你对金钱的喜欢之情足够到让你创立一份事业么?.财富通常被人忽视,主要在于人们不能真正了 相似文献
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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. 相似文献
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RUZBEHANI Mohsen 《重庆大学学报(英文版)》2004,3(1):20-25
1.IntroductionOne-cyclecontrolmethod,whichwasproposedaboutonedecadeago[1],hasbecomeanattractivemethodinspecialfieldssuchaspowerfactorcorrection[2-6],switchingamplifiers[7,8],etc.Themainideaofthiscontrollerisbasedonintegrationofdiodevoltageinone-cycleandforcesittobeexactlyequaltothereferencevalue.Themainadvantageofthiscontrollerisitsrealtimeabilitytorejectthevariationofinputvoltage[1].Despitethisgreatability,ithasnogoodperformancesinrejectingofloaddisturbanceandfollowingreferencecommands.Espec… 相似文献