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1.
李明  赵丽 《计算机工程与设计》2006,27(9):1575-1577,1580
Ontology作为一种描述概念与概念之间关系的模型,能够解决知识共享和重用问题,近年来已被广泛应用于计算机科学的众多领域中,如数字图书馆、软件复用、Web异构信息的处理和语义Web等.介绍了Ontology的定义、分类及组成,并且介绍了建立本体的步骤,通过一个具体的实例详细阐述了建立本体的过程,最后给出了建立本体的构造图.  相似文献   

2.
基于本体的城市交通的知识分析和推理   总被引:10,自引:0,他引:10  
以城市交通为研究和应用背景,基于本体模型的知识表示技术,建立城市交通本体。对城市交通领域知识进行规范描述,详细描述了定义类层次及类的属性和关系,以及实例的基本规则,并从领域知识中提取出类内公理和类间公理,建立公理库,用于领域知识的一致性分析和知识推理。解决了语义层次上信息共享和交互的问题,为上海城市交通信息网格的交通信息服务提供语义支撑。  相似文献   

3.
Web网上存在着大量题目资源,学生在学习过程中需要准确找到与其所学知识真正相吻合的题目。但是从题目的语言表述往往很难获得其语义信息,合适的题目难以找到。该文提出了一种基于Ontology和描述逻辑推理的Web题目资源检索方案。该方案通过为Web题目资源添加语义注释,并通过描述逻辑推理完成基于语义的题目资源检索,使学生获得与其所学知识语义相关的题目。采用OWL描述Ontology、使用推理机RACER实现描述逻辑推理。  相似文献   

4.
语义网是当前Web的扩展,是WWW发展的核心技术之一。为了实现语义网,需要有丰富的且及时更新的本体。本体作为语义网的知识表示模型很好地解决了语义层次上Web信息共享和交换的问题。而本体的构建及其形式表示方法,是建立语义web的基础和核心。论文从Ontology的基本理论出发,基于基本概念、角色和关系,探讨了Ontology领域概念化模型的建立。  相似文献   

5.
镇璐  蒋祖华  刘超  梁军 《计算机工程》2007,33(12):199-201
研究了如何在语义Web中,实现工程设计类知识的表示与应用。对工程设计类各种异构知识进行统一描述,在此基础上,运用RDF(S)技术,建立了语义Web环境下,工程设计类知识的Ontology。提出了基于语义Web的知识存储模型以及面向上层应用程序的接口设计,为语义Web环境下工程设计类知识管理系统的开发提供了底层平台。  相似文献   

6.
元数据的交换是实现语义网应用的基础。在语义网的架构中,Ontology语言利用自己的元级描述能力来建立元数据之间的联系,从而实现语义的交换。本文分析了DAML OIL语言的知识描述能力,并对它蕴含的关于类的知识建立了Prolog的推理规则,最后结合XSBProlog推理引擎和InterProlog接口用Java语言实现了对Ontology的推理,从而实现了不同Ontology之间的元数据交换。  相似文献   

7.
基于Ontology的Web信息检索系统研究   总被引:3,自引:0,他引:3  
传统的信息检索技术以关键字匹配为主,缺乏语义推理能力,对用户的查询请求没有提供语义制导,因此造成信息的误检、漏检.将Ontology用于Web信息检索,分析了Ontology的语义表达能力,提出了基于Ontology的信息检索系统模型(MIRSO).MIRSO能够对用户提供语义制导,将用户的查询条件映射为领域Ontology的概念和关系,使用户的需求表达和信息内容精确匹配.实验结果表明,该方法能够提高信息检索系统的查准率.  相似文献   

8.
基于语义推理的DSS模型研究与应用   总被引:1,自引:0,他引:1       下载免费PDF全文
基于语义网理论建立基于语义推理的DSS模型。该模型引用W3C提出的资源描述框架(RDF)以描述业务领域中各要素,形成领域本体。并对领域中业务数据进行语义标注,构建事实库。在所构建事实库的基础上,系统根据预设规则进行推理,以达到决策支持的目的。最后基于以上方法对施工项目设备推荐领域进行实例建模,建立设备推荐系统。该系统将Semantic Web与Ontology理论引入到施工项目领域,以解决施工项目过程中存在的设备选型推荐问题,并作为语义Web理论在该领域内应用的一次尝试。  相似文献   

9.
基于Ontology的自然语言理解   总被引:9,自引:0,他引:9  
本文分析传统意义上基于知识的自然语言理解(KB—NLU)和基于Ontolqgy的自然语言理解系统的基本模型,Ontology是概念化的描述,以及Ontology,与语言知识的结合方式的三种类型:世界知识型、词汇语义型、句法语义型。  相似文献   

10.
Ontology在网络信息交换中起着重大的作用,OIL是一种基于Ontology技术的Web环境下的领域模型语言。使用OIL定义的领域模型扩展了RDPS,可以实现在Web体系中的计算机可理解知识系统。将Onlology应用到Web上,就产生了语义化的Web。  相似文献   

11.
针对油井工程领域异构数据源,提出了一种基于语义的虚拟视图集成方法。通过本体抽取和本体合并分别构造数据源局部本体和全局本体实现基于语义的数据访问视图,并利用全局本体、局部本体和数据源模式之间的映射关系,将基于语义的查询转换为底层数据源的访问请求,提供统一、透明的数据访问视图,以避免数据加载和更新等问题。通过油井决策支持数据集成平台,该方法取得了很好的应用效果。  相似文献   

12.
SOA的关键是服务,它为WebService提供了一个架构,使用该架构组织家庭服务可以实现跨平台的服务访问。然而SOA架构大多数规范如SOAP、UDDI和WSDL等均是基于XML的,所描述的服务缺乏语义信息,因此在检索过程无法有效处理一词多义和多词一义等语法问题。通过引入本体技术,建立家庭服务领域本体,从服务的功能、内容和设备三个方面利用功能概念本体、内容本体和设备本体进行语义标注,并扩展WSDL为S-WSDL来描述家庭服务。基于本体的家庭服务发现过程分为三个阶段:查找功能、过滤服务和参数类型匹配,充分利用本体的语义优势实现了智能数字家庭服务发现。  相似文献   

13.
This work introduces an OWL-based upper ontology, called OWL-FC (Ontology Web Language for Fuzzy Control), capable to support a semantic definition of Fuzzy Control. It focuses on the fuzzy rules representation by providing domain independent ontology, supporting interoperability and favoring domain ontologies re-usability. The main contribution is that OWL-FC exploits Fuzzy Logic in OWL to model vagueness and uncertainty of the real world. Moreover, OWL-FC enables automatic discovery and execution of fuzzy controllers, by means of context aware parameter setting: appropriate controllers can be activated, depending on the parameters proactively identified in the work environment. In fact, the semantic modeling of concepts allows the characterization of constraints and restrictions for the identification of the right matches between concepts and individuals. OWL-FC ontology provides a wide, semantic-based interoperability among different domain ontologies, through the specification of fuzzy concepts, independently by the application domain. Then, OWL-FC is coherent to the Semantic Web infrastructure and avoids inconsistencies in the ontology.  相似文献   

14.
本体技术使得信息系统具有处理知识的能力,增强信息检索与共享,但是目前本体工具与本体语言对普通的用户具有较高的门槛,加上本体建立方式依赖于本体构造者所注重的知识领域的议题,这反而阻碍了本体的演化。本文提出了一种以本体知识库为核心,基于维基的协作式本体注记平台,利用维基方便,简单及共享的特性推动网络化的本体建设。  相似文献   

15.
Ontologies, which are formal representations of knowledge within a domain, can be used for designing and sharing conceptual models of enterprises information for the purpose of enhancing understanding, communication and interoperability. For representing a body of knowledge, different ontologies may be designed. Recently, designing ontologies in a modular manner has emerged for achieving better reasoning performance, more efficient ontology management and change handling. One of the important challenges in the employment of ontologies and modular ontologies in modeling information within enterprises is the evaluation of the suitability of an ontology for a domain and the performance of inference operations over it. In this paper, we present a set of semantic metrics for evaluating ontologies and modular ontologies. These metrics measure cohesion and coupling of ontologies, which are two important notions in the process of assessing ontologies for enterprise modeling. The proposed metrics are based on semantic-based definitions of relativeness, and dependencies between local symbols, and also between local and external symbols of ontologies. Based on these semantic definitions, not only the explicitly asserted knowledge in ontologies but also the implied knowledge, which is derived through inference, is considered for the sake of ontology assessment. We present several empirical case studies for investigating the correlation between the proposed metrics and reasoning performance, which is an important issue in applicability of employing ontologies in real-world information systems.  相似文献   

16.
An ontology is a crucial factor for the success of the Semantic Web and other knowledge-based systems in terms of share and reuse of domain knowledge. However, there are a few concrete ontologies within actual knowledge domains including learning domains. In this paper, we develop an ontology which is an explicit formal specification of concepts and semantic relations among them in philosophy. We call it a philosophy ontology. Our philosophy is a formal specification of philosophical knowledge including knowledge of contents of classical texts of philosophy. We propose a methodology, which consists of detailed guidelines and templates, for constructing text-based ontology. Our methodology consists of 3 major steps and 14 minor steps. To implement the philosophy ontology, we develop an ontology management system based on Topic Maps. Our system includes a semi-automatic translator for creating Topic Map documents from the output of conceptualization steps and other tools to construct, store, retrieve ontologies based on Topic Maps. Our methodology and tools can be applied to other learning domain ontologies, such as history, literature, arts, and music.  相似文献   

17.
In the context of technological expansion and development, companies feel the need to renew and optimize their information systems as they search for the best way to manage knowledge. Business ontologies within the semantic web are an excellent tool for managing knowledge within this space. The proposal in this article consists of a methodology for integrating information in companies. The application of this methodology results in the creation of a specific business ontology capable of semantic interoperability. The resulting ontology, developed from the information system of specific companies, represents the fundamental business concepts, thus making it a highly appropriate information integration tool. Its level of semantic expressivity improves on that of its own sources, and its solidity and consistency are guaranteed by means of checking by current reasoning tools. An ontology created in this way could drive the renewal processes of companies’ information systems. A comparison is also made with a number of well-known business ontologies, and similarities and differences are drawn, highlighting the difficulty in aligning general ontologies to specific ones, such as the one we present.  相似文献   

18.
基于本体的多主体网络协作学习模型研究   总被引:4,自引:0,他引:4  
协作学习是一种组学习方式,强调的是组成员之间的交流与合作,因此成员间的信息理解对协作的效率影响很大,本体论是概念化的明确表示和描述,因此本体可对学习资源进行语义标注.采用本体提供交流资源的统一语义描述,使学习者在语义基础上进行交流和查询,本体的引入保证了网络协作学习中知识理解和运用的一致性、精确性、不变性、可重用性和共享性.设计了基于本体的多主体网络协作学习模型,该模型不仅具有语义互操作性而且能有效支持知识的重用和共享,从而提高协作学习效率.  相似文献   

19.
Ontologies provide formal, machine-readable, and human-interpretable representations of domain knowledge. Therefore, ontologies have come into question with the development of Semantic Web technologies. People who want to use ontologies need an understanding of the ontology, but this understanding is very difficult to attain if the ontology user lacks the background knowledge necessary to comprehend the ontology or if the ontology is very large. Thus, software tools that facilitate the understanding of ontologies are needed. Ontology visualization is an important research area because visualization can help in the development, exploration, verification, and comprehension of ontologies. This paper introduces the design of a new ontology visualization tool, which differs from traditional visualization tools by providing important metrics and analytics about ontology concepts and warning the ontology developer about potential ontology design errors. The tool, called Onyx, also has advantages in terms of speed and readability. Thus, Onyx offers a suitable environment for the representation of large ontologies, especially those used in biomedical and health information systems and those that contain many terms. It is clear that these additional functionalities will increase the value of traditional ontology visualization tools during ontology exploration and evaluation.  相似文献   

20.
One of the goals of the knowledge puzzle project is to automatically generate a domain ontology from plain text documents and use this ontology as the domain model in computer-based education. This paper describes the generation procedure followed by TEXCOMON, the knowledge puzzle ontology learning tool, to extract concept maps from texts. It also explains how these concept maps are exported into a domain ontology. Data sources and techniques deployed by TEXCOMON for ontology learning from texts are briefly described herein. Then, the paper focuses on evaluating the generated domain ontology and advocates the use of a three-dimensional evaluation: structural, semantic, and comparative. Based on a set of metrics, structural evaluations consider ontologies as graphs. Semantic evaluations rely on human expert judgment, and finally, comparative evaluations are based on comparisons between the outputs of state-of-the-art tools and those of new tools such as TEXCOMON, using the very same set of documents in order to highlight the improvements of new techniques. Comparative evaluations performed in this study use the same corpus to contrast results from TEXCOMON with those of one of the most advanced tools for ontology generation from text. Results generated by such experiments show that TEXCOMON yields superior performance, especially regarding conceptual relation learning.  相似文献   

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