基于Ontology的跨媒体检索技术

针对如何在相似媒体之间进行有效关联,描述跨媒体的相似性等问题,提出一种新的跨媒体检索方法。提取多媒体对象的低层特征,利用Ontology对其进行组织,在语义层次实现多媒体关联。实验结果证明,基于Ontology的方式可以有效完成跨媒体检索。     

基于语义技术的软件用户访问控制方法

在应用软件中广泛使用的访问控制模型不能根据用户上下文来动态改变资源的访问权限。针对上述问题提出一种基于语义技术的访问控制方法,实现了对用户的动态授权。提出基于语义信息的用户模型和资源模型并构建面向用户模型和资源模型的基础本体,定义一组与访问控制相关的语义规则及推理规则,并设计基于语义推理过程的判定算法。访问控制过程是接收并分析访问请求,根据语义规则从显示的本体知识中获取相关联的用户信息,调用判定算法得出用户与资源间的访问权限关系。最后通过某综合减灾应用系统案例来验证该方法的有效性。     

模式级链接关联数据集上的关联规则挖掘研究

针对关联数据集合呈现出的大数据特性和蕴含的语义信息,提出了首先建立关联数据集的模式级链接,再进行关联规则挖掘的方法。在同领域RDF数据集上定义RDF数据项模式并提出数据项模式的产生规则;利用RDF数据查询技术从数据项模式获得RDF数据项集合,进而再推导出特定领域内的关联规则。提出的基于关联数据RDF数据项模式的关联规则挖掘方法将关联规则挖掘扩展到同一领域内的数据集合而不再局限于单一数据集,同时给出了基于Hadoop的大规模RDF数据集上的关联规则挖掘的实现方案。实验结果验证了模式级链接对于关联规则挖掘的价值和所提方法的有效性。     

Closed-loop PLM for intelligent products in the era of the Internet of things

With the advent of the information and related emerging technologies, such as RFID, small size sensors and sensor networks or, more generally, product embedded information devices (PEID), a new generation of products called smart or intelligent products is available in the market.Although various definitions of intelligent products have been proposed, we introduce a new definition of the notion of Intelligent Product inspired by what happens in nature with us as human beings and the way we develop intelligence and knowledge. We see an intelligent product as a product system which contains sensing, memory, data processing, reasoning and communication capabilities at four intelligence levels. This future generations of Intelligent Products will need new Product Data Technologies allowing the seamless interoperability of systems and exchange of not only Static but of Dynamic Product Data as well. Actual standards for PDT cover only lowest intelligence of today’s products. In this context, we try to shape the actual state and a possible future of the Product Data Technologies from a Closed-Loop Product Lifecycle Management (C-L PLM) perspective.Our approach is founded in recent findings of the FP6 IP 507100 project PROMISE and follow-up research work. Standards of the STEP family, covering the product lifecycle to a certain extend (PLCS) as well as MIMOSA and ISO 15926 are discussed together with more recent technologies for the management of ID and sensor data such as EPCglobal, OGC-SWE and relevant PROMISE propositions for standards.Finally, the first efforts towards ontology based semantic standards for product lifecycle management and associated knowledge management and sharing are presented and discussed.     

Semantic-based web service discovery and chaining for building an Arctic spatial data infrastructure

Increasing interests in a global environment and climate change have led to studies focused on the changes in the multinational Arctic region. To facilitate Arctic research, a spatial data infrastructure (SDI), where Arctic data, information, and services are shared and integrated in a seamless manner, particularly in light of today's climate change scenarios, is urgently needed. In this paper, we utilize the knowledge-based approach and the spatial web portal technology to prototype an Arctic SDI (ASDI) by proposing (1) a hybrid approach for efficient service discovery from distributed web catalogs and the dynamic Internet; (2) a domain knowledge base to model the latent semantic relationships among scientific data and services; and (3) an intelligent logic reasoning mechanism for (semi-)automatic service selection and chaining. A study of the influence of solid water dynamics to the bio-habitat of the Arctic region is used as an example to demonstrate the prototype.     

流程可定制本体匹配框架:RiMOM2

本体作为语义Web中的语义表示形式,是语义Web体系结构中的核心元素,是实现知识共享、协同工作的关键。然而现实世界中本体自身与生俱来的分布性和异构性,又极大地限制了数据的共享与集成。为了实现知识的共享、数据的集成,近年来针对本体匹配方法的研究得到了广泛的重视。随着本体匹配研究的深入,许多有效的本体匹配方法被提出。RiMOM2正是一种集成了多种有效本体匹配方法的多策略本体匹配框架。它尽可能地向初级用户隐藏不必要的阂值设定和参数设置,而向高级用户提供匹配流程的可定制功能,以期针对不同用户实现一种既能适用于普遍本体匹配任务,操作简易,又能达到具有针对性匹配效果的本体匹配工具。同时该框架具有匹配方法组件的易扩展性。     

基于语义的领域虚拟数据中心研究与实现

油井工程领域涉及的数据具有分布、异构和自治性强等特点,并且存在复杂的语义关联,无法为全局决策提供有效的数据支持。利用本体和虚拟视图集成技术,提出了油井工程虚拟数据中心解决方案,通过构造领域全局本体并利用本体抽取、本体映射和查询转换实现领域数据语义集成,提供了统一和基于语义的数据查询与共享服务。实际应用表明,虚拟数据中心能够为油井生产决策提供全面和实时的数据支持。     

一类基于知识的通信中介代理

介绍了一类基于知识的通信中介代理,它为网上通信各方提供智能中介服务。通过这类代理,网上通信各方可以以信息需求驱动的通信方式替代传统地址驱动的通信方式。同时,还对共享本体论等进行了讨论。     

IRS-III: A broker-based approach to semantic Web services

A factor limiting the take up of Web services is that all tasks associated with the creation of an application, for example, finding, composing, and resolving mismatches between Web services have to be carried out by a software developer. Semantic Web services is a combination of semantic Web and Web service technologies that promise to alleviate these problems. In this paper we describe IRS-III, a framework for creating and executing semantic Web services, which takes a semantic broker-based approach to mediating between service requesters and service providers. We describe the overall approach and the components of IRS-III from an ontological and architectural viewpoint. We then illustrate our approach through an application in the eGovernment domain.