An Experimental Ontology Server for an Information Grid Environment

Semantic web and grid technologies offer a promising approach to facilitate semantic information retrieval based on heterogeneous document repositories. In this paper the authors describe the design and implementation of an Ontology Server (OS) component to be used in a distributed contents management grid system. Such a system could be used to build collection document repositories, mutually interoperable at the semantic level. From the contents point of view, the distributed system is built as a collection of multimedia documents repository nodes glued together by an OS. A set of methodologies and tools to organize the knowledge space around the notion of contents community is developed, where each content provider will publish a set of ontologies to collect metadata information organized and published through a knowledge community, built on top of the OS. These methodologies were deployed while setting up a prototype to connect about 20 museums in the city of Naples (Italy).     

An Ontology-Based Approach to Personalized Situation-Aware Mobile Service Supply

Mobile devices such as personal digital assistants (PDAs) and mobile phones are in widespread use already today and converging to mobile smart phones. They enable users to access a wide range of services and information without guidance through their actual demands. Especially during mass events like the Olympic Games 2008 in Beijing—which was initially the context of our work—a large service space is expected to support all mobile visitors, being athletes, journalists, or spectators. Current approaches tackling such problems are location based, meaning that a user's location is central to service provision, and even context-aware, meaning that, beyond location, characteristics of a user's environment are taken into account. Such information obviously helps to deliver relevant information at the right time to the mobile users. Going one step further, a situation-aware system abstracts from the context dimensions by translating specific contexts into logical situations. Knowing the situation end users are in allows the system to better identify the information to be delivered to them and to choose the appropriate services with regard to their scope, which is referred to as service roaming. Even though many context frameworks have been introduced in the past few years, what is usually missing is the notion of characteristic features of contexts that are invariant during certain time intervals. This paper presents these concepts in the context of a platform development, namely FLAME2008, which is able to support its mobile users with personalized situation-aware services in push and pull mode.     

一种基于Ontology的数据集成方法

随着企业的应用系统、数据库系统、企业内部互联网及其互联网上分布式数据信息的爆炸式增长,如何集成数据库、信息系统及其它数据资源,是企业亟待解决的问题。该文主要讨论集成过程中的异构问题,尤其是语义异构问题。分析了利用本体解决语义异构的可能性。最后,该文描述了一种建立数据集成环境下本体的方法。     

基于语义Web的空间信息共享服务

存取、交换、集成空间信息是Web应用研究的热点之一。然而,Web是设计为人使用的,人们必须浏览、理解、选择和导航Web信息。此外,由于数据间的语义冲突和缺乏集成存取共享的空间信息的工具,空间信息很难得到利用。利用语义Web技术和常用本体,提出了查找互联网上的空间信息的方法。首先介绍了语义Web的主要概念;其次描述了语义冲突解决本体;最后详细地探讨了如何在语义Web上实现空间信息共享服务。     

本体动态工作流系统的研究与实现

为能对采办过程中的武器装备全生命周期进行管理,提供连续支持的集成环境,该文提出并部分实现了基于本体工作流模型的采办系统,即采用框架知识的表示方式对采办过程中所涉及到的各种资源和工作流定义进行描述,进而把整个采办过程中的资源保存到知识库中,采办人员根据工作流的引导和相应的权限使用知识库中的各类资源。采办过程中对本体的共同理解使参与采办的企业有共同集成和协作的基础,同时针对采办项目的知识库可进一步提供对项目分析、预测和决策的支持。     

基于本体的战场信息表示方法研究

提出了一种基于本体的战场信息表示方法,与现有的信息描述方法不同,该方法侧重于对战场信息内容和语义的表示,突出了战场事件、实体和关系。在对战场信息进行一体化描述的同时,增强了信息的可理解性、互操作性,尤其是对于基于语义的作战任务需求信息的挖掘和信息质量综合评估具有重要作用。     

基于本体的多智能体Internet动态路由研究

在Internet路由方面,传统采用的点对点或广播方式不能满足网络信息传输的效率要求,而采用组播方式缓解这个问题的相关研究大多为静态方法,不能很好地解决Internet提出的动态问题。为了实现高效率、自适应的Internet动态路由策略,在多Agent技术和本体论知识基础上,提出基于本体建立开放式多智能体Internet动态路由结构框架的思想。建立了基于多Agent的体系架构,并使用主体开发工具Protégé描述Internet主动路由的概念主体和任务主体模型,以支持Agent之间的知识共享和通信。根据该体系架构建立基于多Agent的Internet路由控制与分析系统（Multi-Agent Internet Routing System,MAIRS）。通过与相同实验环境下NS2的仿真结果进行比较,表明这个结合多Agent技术和本体方法的体系结构能够满足Internet路由的动态性和互操作性的需求。     

概念与文档的语义相似度计算

将本体作为背景知识引入到概念之间相似度和文档之间相似度的计算中。通过图模型表示本体中概念以及概念之间的语义关系,用来将一个概念和一个文档扩展为一个语义模糊集,并计算模糊集合之间的相似度。文档相似度的计算是在概念相似度计算的基础之上。在概念相似度的计算过程中引入了语义相似度矩阵以及基于共信息理论的模糊相似度方法。     

基于KQML面向虚拟企业合作伙伴选择的多Agent系统通信模型

给出了一个面向虚拟企业合作伙伴选择的多Agent系统基于KQML的通信模型。介绍了各Agent间通信时用到的KQML保留原语,并对KQML原语进行了适当的扩充以满足系统通信的要求。最后给出了在通信中使用较多的与数据操作有关的KQML消息到相关的数据操作SQL语句间的映射关系,较好地实现了KQML消息与SQL语句的衔接。     

知识表示及企业本体建模研究

在企业建模领域引入本体思想,介绍了企业本体的概念、作用和意义,然后阐述了企业知识表示和组织策略。最后通过一个实例给出了本体建模的详细步骤和方法体系。基于本体的企业建模从根本上解决了企业的知识共享和重用问题。