共查询到20条相似文献，搜索用时 250 毫秒
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近年来,语义Web逐渐成为WWW领域的研究热点以及智能化网络服务和应用开发中的关键技术之一.本文在分析了典型的语义Web概念后,给出了语义Web的定义.通过讨论语义Web构想的层次框架模型,指出了各个层次扮演的角色以及它们在语义Web构架中的作用,同时对语义Web的技术基础做了详细的介绍,并指出了国内语义Web研究中存在的不足. 相似文献
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自万维网创始人Tim Bemers—Lee提出语义Web概念及相应的参考模型以来，现已由当初的语义Web研究转向智能Web服务的研究．在研究W3C组织提出语义Web服务框架的基础上，这里给出了一个可行的语义Web服务发现的分层agent模型，为研究语义Web服务发现的上层建模提供参考． 相似文献
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研究语义Web服务匹配问题,提高匹配效率。传统Web服务基于关键字匹配,灵活性差,查准率和查全率偏低;语义Web服务引入机器可理解的语义信息,提高了信息共享程度及服务检索成功率,但服务响应慢,系统开销大。为了提高Web服务匹配效率,降低系统成本,提出一种基于语义相似度的Web服务混合匹配策略。首先对语义Web服务匹配问题进行分析,然后建立基于语义相似度的Web服务混合匹配模型,最后在西江物流平台中设计了一个基于语义Web服务的混合匹配框架。实际应用效果表明,混合匹配策略实现了语义Web的更好匹配,为客户提供更为快捷、准确的“寻车配货”服务。 相似文献
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通过研究Agent技术与语义Web服务技术在应用中结合的方式和Agent在语义Web服务技术体系中需要扮演的角色,以及Agent与语义Web服务结合的具体实现,提出了一种基于Agent的语义Web服务框架。在此框架的原理基础上,利用扩展逻辑C&L意图理论描述了框架中Agent的工作过程以及语义Web服务的内容。 相似文献
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在传统Web服务的中,基于关键词的Web服务匹配缺乏语义支持,搜索效率低.语义Web技术与Web服务的结合,开辟了语义Web服务的研究领域,本文以所提出的匹配策略为主线,围绕语义Web服务层次松弛匹配机制,依次展开服务类别、服务文本描述、服务功能、服务质量四个层次的匹配研究,实现了从语法相似度、语义相似度和QoS相似度上对Web服务的选择. 相似文献
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信任对于语义Web来说是非常重要的。受人类社会信任使用的启发,本文提出了一个主观的语义Web信任模型。文中首先对语义Web中的信任相关概念进行了讨论,接着对信任表述,信任度量等关键问题进行了详细地分析,最后是语义Web信任的展望和信任面临的关键技术。 相似文献
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为了提高语义Web服务的发现性能,从Web服务描述上下文中抽取语义标注的约束信息并生成新的更精确的语义标注,从而减少语义标注与参数之间的语义偏差,精化Web服务的语义描述.首先,从本体定义中抽取概念的约束模板,并对Web服务的描述文本进行句法分析;然后,根据约束模板,从句法分析树中抽取语义标注的约束信息,并构造新的概念表达式作为对应参数的新的语义标注.最后,提出了一种新的语义相似度度量方法以度量概念表达式的相似度.实验结果表明：该方法能够提高语义Web服务发现的平均准确率,且计算代价相对较小.从描述文本中抽取概念的约束信息,能够减少标注的语义偏差,更精确地表达语义Web服务的语义,提高Web服务的发现性能. 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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罗艳萍 《读与写:教育教学刊》2008,5(6)
The communication of people partially is the communication of cultures. Culture has a direct effect on international commercial activities in all aspects. Different conceptions about time, space, equality, law and the like, lead people to deal with things in different ways. So to know cultures of the counterpart is to facil-itate our enterprises so as to have a smooth and successful communication in commercial activity. 相似文献
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Richard Denner 《海外英语》2007,(4):14-15
Rosco and I wait for the fishermen to return.I sit at a wooden bench near the store at Mt.Baker Resort and watch the clouds change shape. Rosco has my belt around his neck and an eight foot tow chain hooked to a tree. Dogs must be on a leash. Ducks and rabbits are loose. 相似文献
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Given a graph G,a subgraph C is called a clique of G if C is a complete subgraph of G maximal under inclusion and |C|≥2. A clique-transversal set S of G is a set of vertices of G such that S meets all cliques of G. The clique-transversal number, denoted as TC (G), is the minimum cardinality of a clique-transversal set in G. The clique-graph of G, denoted as K (G), is the graph obtained by taking the cliques of G as vertices, and two vertices are adjacent if and only if the corresponding cliques in G have nonempty intersection. Let F be a class of graphs G such that F={G|K(G) is a tree}. In this paper the graphs in F having independent clique-transversal sets are shown and thus TC (G)/|G|≤1/2 for all G ∈ F. 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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陈美曦 《山东教育学院学报》2008,23(2):103-107
Different nations have different social cultures, and the social culture of every nation is developing with the development of the nation, language is greatly influenced by social culture, which enables language to possess national and historical characteristics. Word is the smallest, independent, meaningful linguistic unit of language. It can well reflect the national and historical characteristics. From synchronic aspect, the social and cultural influence on word meaning is mainly embodied in conceptual and associative meanings of word. The incorrespondence of word meaning is a phenomenon that exists in both conceptual and associative meanings of word among different languages. From diachronic aspect, the development of social culture causes some changes of word meaning to some extent. Therefore, social culture plays a key role in vocabulary learning and mastery of a language. 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