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有这样一群人,他们喜欢音乐。但是,一开始,他们不懂得声音。
后来,他们学会了鉴别声音好与坏。慢慢地,他们开始懂得了欣赏音乐,追求声音的美妙。
但是,他们和纯粹的HlFler不同。对于声音,他们追求完美,但不苛求完美。所以,他们理性,不烧包。
于是,他们总在品质和价格之间,寻找平衡…… 相似文献
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许意 《数码设计:surface》2012,(5):86-87
他们视工具为自己的另一双手;有时他们和工具较劲,有时他们被工具征服:他们会经常改造甚至是发明某些工具,同时,他们的作品也会被工具改变。他们是一群与工具互为彼此、相依为命的人。 相似文献
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他们身处IT业,他们的顶头上司是本文的主角.他们与她们一起挥洒汗水、并肩作战。从他们的经历中,借用他们的视角,去感觉、去了解别样的IT女上司。 相似文献
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《家用电脑与游戏机》2012,(5):26-28
在山的那边海的那边有一群熊猫人,他们活泼又聪明,他们勇敢又善良,他们自由自在生活在那绿色的大森林,他们团结友爱相互多关心,我可爱的熊猫人,哦可爱的熊猫人,他们加入部落投身联盟拯救了全宇宙,他们唱歌跳舞快乐多欢喜。 相似文献
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田柱 《中国信息技术教育》2011,(17)
这是一些特殊的教师,他们组织学习小组,开展小班授课;他们成为学生中的一员,实行开放式教育,以导代表;他们带领小组队员在国内外各项赛中,寻找荣誉与激情;他们是教师,也是领队,又像班长,他们是每个机器人兴趣小组的灵魂人物,是每一个学生的定心丸。因此,让我们倾听他们的声音,倾听机器人教育的冲锋号角。 相似文献
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The Semantic Web application framework extends Ruby on Rails to enable rapid development of integrated Semantic Web mash-ups. Web applications are mostly database driven. Developers design a database schema and then construct the application logic (which generates Web pages for user interaction) on top of the schema. These applications are centralized and rely on their own relational database, limiting the possibilities for data integration. Mash-ups (often called Web 2.0 applications) are an emerging Web development paradigm that combines functionality from different Web applications. 相似文献
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基于《知网》的中文Deep Web模式匹配算法研究 总被引:1,自引:1,他引:0
随着数据库在Internet中的应用日益广泛,Deep Web集成(即Web数据库集成)成为当前信息领域的研究热点,模式匹配是Deep Web查询接口集成中的一个关键问题。目前大多数这方面的研究都是基于英文的,针对这种情况,探讨了中文Deep Web查询接口的模式匹配方法,并提出了一种基于《知网》、面向中文语义的模式匹配算法,并利用属性在查询接口上的相对位置信息解决语义冲突。手工收集查询表单对算法进行验证,实验表明该方法能使得接口之间属性匹配的正确率达到90 %以上。 相似文献
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Deep Web集成服务的不确定模式匹配 总被引:5,自引:0,他引:5
随着Deep Web的迅猛发展,从高度自治、异构及动态变化的Web数据库中,为用户提供高质量的数据逐渐成为当前Deep Web集成服务的一个研究热点.在大部分Web数据库只能通过查询接口为用户提供服务的前提下,如何建立用户请求与集成查询接口模式之间以及集成查询接口模式与Web数据库查询接口模式之间的匹配关系,是Deep Web集成服务中进行合理的用户请求转换的关键.之前的相关工作都是寻找最佳的匹配结果,回避匹配的不确定性,丢弃了可能有价值的其他匹配结果.文中首先剖析了请求转换中模式匹配的不确定性,提出了数字类型的相似度计算方法,给出了进行数字类型的模式匹配的有效的剪枝方法以及数据类型驱动的模式匹配优化方法,并在此基础上提出了一种基于相似度计算的不确定性模式匹配方法,最后通过大量的实验证明了该方法的有效性. 相似文献
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Many databases have become Web-accessible through form-based search interfaces (i.e., HTML forms) that allow users to specify
complex and precise queries to access the underlying databases. In general, such a Web search interface can be considered
as containing an interface schema with multiple attributes and rich semantic/meta-information; however, the schema is not
formally defined in HTML. Many Web applications, such as Web database integration and deep Web crawling, require the construction
of the schemas. In this paper, we first propose a schema model for representing complex search interfaces, and then present
a layout-expression based approach to automatically extract the logical attributes from search interfaces. We also rephrase
the identification of different types of semantic information as a classification problem, and design several Bayesian classifiers
to help derive semantic information from extracted attributes. A system, WISE-iExtractor, has been implemented to automatically
construct the schema from any Web search interfaces. Our experimental results on real search interfaces indicate that this
system is highly effective. 相似文献
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基于OWL本体论映射的数据库网格语义模式集成研究 总被引:3,自引:0,他引:3
本文提出了一种在数据库网格中OWL本体论映射机制如何用于基于语义的数据库模式集成。方法是首先把关系模式转化为RDF/OWL语义描述以完成局部映射,再通过把局部数据语义与全局共享本体建立联系来完成全局映射。本质是把异构数据库模式的语义通过本体显性地表达出来,并在语义Web层完成模式的集成。特点是实现了在统一的语义层次上进行共享与查询,同时采用了局部映射与全局映射松耦合的构架,其特有的分层结构使得在跨库/单库环境中进行语义查询变得更加灵活。 相似文献
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The Web as a global information space is developing from a Web of documents to a Web of data. This development opens new ways for addressing complex information needs. Search is no longer limited to matching keywords against documents, but instead complex information needs can be expressed in a structured way, with precise answers as results. In this paper, we present Hermes, an infrastructure for data Web search that addresses a number of challenges involved in realizing search on the data Web. To provide an end-user oriented interface, we support expressive user information needs by translating keywords into structured queries. We integrate heterogeneous Web data sources with automatically computed mappings. Schema-level mappings are exploited in constructing structured queries against the integrated schema. These structured queries are decomposed into queries against the local Web data sources, which are then processed in a distributed way. Finally, heterogeneous result sets are combined using an algorithm called map join, making use of data-level mappings. In evaluation experiments with real life data sets from the data Web, we show the practicability and scalability of the Hermes infrastructure. 相似文献
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基于OWL-S的Web服务发现系统的研究和实现 总被引:2,自引:0,他引:2
文中针对目前基于WSDL,UDDI等技术的Web服务发现存在的不足,提出了一种使用OWL-S进行Web服务描述的新的服务发现机制。介绍了Web服务的语义描述语言OWL-S,设计并实现了一个Web服务发现系统。同时,详细介绍了存储Web服务OWL-S描述信息的数据库结构的设计,以及服务请求时进行服务匹配使用的匹配算法。 相似文献
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This research investigates and approach to query processing in a multidatabase system that uses an objectoriented model to capture the semantics of other data models. The object-oriented model is used to construct a global schema, defining an integrated view of the different schemas in the environment. The model is also used as a self-describing model to build a meta-database for storing information about the global schema. A unique aspect of this work is that the object-oriented model is used to describe the different data models of the multidatabase environment, thereby extending the meta database with semantic information about the local schemas. With the global and local schemas all represented in an object-oriented form, structural mappings between the global schema and each local schema are then easily supported. An object algebra then provides a query language for expressing global queries, using the structural mappings to translate object algebra queries into SQL queries over local relational schema. The advantage of using an object algebra is that the object-oriented database can be viewed as a blackboard for temporary storage of local data and for establishing relationships between different databases. The object algebra can be used to directly retrieve temporarily-stored data from the object-oriented database or to transparently retrieve data from local sources using the translation process described in this paper. 相似文献