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基于描述逻辑的本体导航 总被引:3,自引:0,他引:3
计算机支持的协同学习系统经常采用知识导航模块,该模块的核心是本体库。许多本体库采用框架表示法,但框架表示语义不精确。该文提出了本体的描述逻辑表示和框架表示相结合,给出了描述逻辑表示的本体转化为框架本体表示的算法。 相似文献
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基于本体DL的语义推理研究 总被引:3,自引:1,他引:2
随着Internet的迅速发展,语义Web作为新一代Web正倍受关注,因为语义表述与推理是语义网需要解决的关键问题。为了解决这一问题,文中在概述了本体语言、描述逻辑的概念和描述逻辑的原理的基础上,提出了一种新的方法:让本体表示语言与描述逻辑相结合,从而为语义推理的合理性和有效性提供了保证。文中重点介绍了通过对基于本体DL的语义推理机制进行阐述分析,较详细地探讨了在本体构建过程中,运用基于描述逻辑的语义推理进行一致性判定和相容性判定的重要性和实现技术,并以果品领域的本体构建为例,对构建过程中的推理判定进行了验证。 相似文献
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本体是概念模型的明确的规范说明,能够精确地描述概念体系和领域知识。为了将异构数据源中的数据识别出来并进行语义相关的集成,提出了一种基于本体集成异构数据源的方法。首先将各个数据源中的数据以XML文档形式进行描述,然后将各个XML文档的文档类型定义(DTD)转化为DIM数据模型表示,最后通过语义聚类、全局模式生成等步骤,实现XML文档的基于本体的语义集成。文中提出的方法以普林斯顿大学的心理学家、语言学家和计算机工程师联合设计的一种基于认知语言学的英语词典为本体库,可有效地识别出异构数据源中的具有等价语义或相近语义的数据,从而更准确地对异构数据源中的数据进行集成。 相似文献
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基于扩展序类逻辑的Ontology形式化描述与模型检验 总被引:2,自引:1,他引:1
本体一直是哲学中的词汇,后来随着计算机语义网络的发展,引入语义web领域,用来表示概念以及概念和概念之间的关系.用逻辑来形式化Ontology,并对形式化后的Ontology进行检验和推理一直是Ontology研究的热点和难点.参考描述逻辑描述本体的方法,提出了以扩展序类逻辑来描述本体,并对描述后的本体进行检验. 相似文献
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本体是概念模型的明确的规范说明,能够精确地描述概念体系和领域知识.为了将异构数据源中的数据识别出来并进行语义相关的集成,提出了一种基于本体集成异构数据源的方法.首先将各个数据源中的效据以XML文档形式进行描述,然后将各个XML文档的文档类型定义(DTD)转化为DIM数据模型表示,最后通过语义聚类、全局模式生成等步骤,实现XML文档的基于本体的语义集成.文中提出的方法以普林斯顿大学的心理学家、语言学家和计算机工程师联合设计的一种基于认知语言学的英语词典为本体库,可有效地识别出异构数据源中的具有等价语义或相近语义的数据,从而更准确地对异构数据源中的数据进行集成. 相似文献
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基于本体的推理机研究 总被引:3,自引:1,他引:3
语义网技术的兴起促进了本体技术的发展,本体作为语义网的基石,在知识表示与知识推理方面发挥着重要作用。本体表示语言与描述逻辑相结合,为本体推理的合理性和有效性提供了保证。介绍了本体语言、描述逻辑和描述逻辑推理的基本原理,重点介绍了基于SHIQ描述逻辑的推理机Racer的基本功能及其在智能信息检索中的应用。 相似文献
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One of the key promises of the Semantic Web is its potential to enable and facilitate data interoperability. The ability of data providers and application developers to share and reuse ontologies is a critical component of this data interoperability: if different applications and data sources use the same set of well defined terms for describing their domain and data, it will be much easier for them to “talk” to one another. Ontology libraries are the systems that collect ontologies from different sources and facilitate the tasks of finding, exploring, and using these ontologies. Thus ontology libraries can serve as a link in enabling diverse users and applications to discover, evaluate, use, and publish ontologies. In this paper, we provide a survey of the growing—and surprisingly diverse—landscape of ontology libraries. We highlight how the varying scope and intended use of the libraries affects their features, content, and potential exploitation in applications. From reviewing 11 ontology libraries, we identify a core set of questions that ontology practitioners and users should consider in choosing an ontology library for finding ontologies or publishing their own. We also discuss the research challenges that emerge from this survey, for the developers of ontology libraries to address. 相似文献
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Databases and cell-selection algorithms for VLSI cell libraries 总被引:1,自引:0,他引:1
The issues that must be addressed before commercial database management systems can be used to manage VLSI CAD data are defined. A survey is presented of approaches addressing four of the defined issues: design hierarchies and multilevel representations, design alternatives and version control, common interface between cell libraries and efficient cell selection based on given design constraints. A frame-based model is considered as a case study of the special-purpose design database management system approach. This framework for capturing design data is based on semantic networks. It is well suited for application-specific ICs, yet general enough for other CAD/CAM environments. Benchmark results for the selection algorithms that run on top of the frame-based database system are presented 相似文献
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基于本体的MAS黑板模型研究 总被引:3,自引:0,他引:3
探讨了基于本体的多智能代理黑板知识库系统(OMSBS)的体系结构及OMABS中Agent的模型、组织和交互方式。提出了一种描述混合知识类型的本体知识表达模型。本体在OMSBS中作为领域知识智能代理的知识库,是知识共享和智能代理之间通讯的基础,设计了一类调度智能代理以控制知识源智能代理的行为。OMSBS可以表达混合类型知识及其推理过程,具有良好的适应性和扩展性,呈现出开放结构。 相似文献
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刘芬 《计算机光盘软件与应用》2011,(16)
数字图书馆已经不再是一个崭新的概念,经历了相当一段时间的发展。在这一段时期之内,数字图书馆的建设在很多方面已经有了很大改进,这是一种概念和思想,便捷的服务是其中一个重要的组成要素。本文首先对数字图书馆的发展历史展开了阐述,其次结合数字图书馆的特点,强调了应用数据库技术对图书馆信息进行组织管理的必要性,最后着重探讨了数据仓库技术、关系数据库、多媒体数据库、面向对象的数据库技术、非结构化数据库技术等在数字图书馆信息组织的应用。 相似文献
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This paper reviews the use of computer ontologies for Internet data linking and knowledge representation. We discuss a trend in organizing ontology libraries and servers for the joint development of ontologies and their application. Ontology libraries are regarded as public Web resources. We pay special attention to the design of ontology libraries, their debugging, and directions for their development. 相似文献
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Natalya F. Noy Mark A. Musen Jos L. V. Mejino Jr. Cornelius Rosse 《Data & Knowledge Engineering》2004,48(3):788-359
One of the main threads in the history of knowledge-representation formalisms is the trade-off between the expressiveness of first-order logic on the one hand and the tractability and ease-of-use of frame-based systems on the other hand. Frame-based systems provide intuitive, cognitively easy-to-understand, and scalable means for modeling a domain. However, when a domain model is particularly complex, frame-based representation may lead to complicated and sometimes awkward solutions. We have encountered such problems when developing the Digital Anatomist Foundational Model, an ontology aimed at representing comprehensively the physical organization of the human body. We show that traditional frame-based techniques such as is-a hierarchies, slots (roles) and role restrictions are not sufficient for a comprehensive model of this domain. The diverse modeling challenges and problems in this project required us to use such knowledge-representation techniques as reified relations, metaclasses and a metaclass hierarchy, different propagation patterns for template and own slots, and so on. We posit that even though the modeling structure imposed by frame-based systems may sometimes lead to complicated solutions, it is still worthwhile to use frame-based representation for very large-scale projects such as this one. 相似文献
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Lamy J 《Computer methods and programs in biomedicine》2007,85(1):51-58
This paper describes a method to integrate digital topology informations in image-processing libraries. This additional information allows a library user to write algorithms respecting topological constraints, for example, a seed fill or a skeletonization algorithm. As digital topology is absent from most image-processing libraries, such constraints cannot be fulfilled. We describe and give code samples for all the structures necessary for this integration, and show a use case in the form of a homotopic thinning filter inside ITK. The obtained filter can be up to a hundred times as fast as ITK's thinning filter and works for any image dimension. This paper mainly deals of integration within ITK, but can be adapted with only minor modifications to other image-processing libraries. 相似文献
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针对当前高校图书馆数字资源配置存在合理性差和效率低等问题,提出一种基于云计算和深度信念网络的图书馆数字资源配置方法.首先采用云计算技术构建图书馆数字资源配置模型;其次采用深度信念网络对图书馆数字资源节点进行特征训练,并对资源进行合理配置;最后与图书馆数字资源配置的其他方法进行实验分析与比较.分析结果表明,所提方法既可提... 相似文献