一个松散耦合的多Agent系统通信框架

传统的Agent通信采用紧耦合方式,不利于多Agent系统的扩展和异质Agent之间的互操作.分析了Web服务和语义Web服务的基本模型,借鉴了语义Web服务的体系结构思想和实现手段,在此基础上给出了一个松散耦合的多Agent通信框架.框架强调慎思式多Agent之间合作的起点是Agent对自身能力的描述和发布,通过语法封装和语义映射解决使用不同ACL(Agent通信语言)的Agent交互问题,具有灵活性、可扩展性、简单性和通用性.     

基于QoS的语义Web服务组合研究

Web服务技术与语义网技术的发展,产生了一个新的研究领域——语义网服务。语义网服务利用本体技术增强了Web服务的语义表达能力,使服务的发现与执行,组合与交互更加自动智能化。关注Web服务的非功能属性,即服务的QoS属性,研究分析了基于QoS的语义网服务组合工作,提出了一个Web服务的QoS本体模型,并讨论了该模型在语义网服务组合工作中的应用。     

一种基于Agent的语义Web服务编制框架

针对动态、开放网络环境下复杂多变的业务需求,本文在前期语义编程语言SPL研究的基础上,提出一种基于Agent和本体的语义Web服务编制方法,形成一个以语义编程语言SPL为核心的、可适用于将语义Web服务与多A-gent技术无缝集成起来的,进行语义Web服务编制的技术框架。框架实现基于SPL开发和运行支撑平台,该平台为语义Web服务和软件Agent提供必要的运行支持。     

Semantic Web computing in industry

The Semantic Web has attracted significant attention during the last decade. On the one hand, many research groups have changed their focus towards Semantic Web research and research funding agencies particularly in Europe have explicitly mentioned Semantic Web in their calls for proposals. On the other hand, industry has also begun to watch developments with interest and a number of large companies have started to experiment with Semantic Web technologies to ascertain if these new technologies can be leveraged to add more value for their customers or internally within the company, while there are already several offers of vendors of Semantic Web solutions on the market. The essence of the Semantic Web is to structure Web-based information to make it more interoperable, machine-readable and thereafter to provide a means to relate various information concepts more easily and in a reusable way. The Semantic Web acts as an additional layer on the top of the Web, and is built around explicit representations of information concepts and their relationships such as ontologies and taxonomies. Furthermore, Semantic Web technologies are not only valuable on an open environment like the Web, but also in closed systems such as in industrial settings. Hence, these technologies can be efficiently deployed for domains including Web Services, Enterprise Application Integration, Knowledge Management and E-Commerce, fulfilling existing gaps in current applications. This paper focuses on this synthesis between Semantic Web technologies and systems problems within industrial applications. There will be a short review of Semantic Web standards, languages and technologies followed by a more detailed review of applications of Semantic Web computing in industry. The paper covers theoretical considerations as well as use cases and experience reports on the topic, and we also present some current challenges and opportunities in the domain.     

基于语义距离度量模型的语义Web服务匹配排序机制

随着语义Web服务技术研究工作的不断深入,因特网上语义Web服务数量急剧增加。如何快速便捷地定位可用语义Web服务已经成为一个迫切且关键的问题。在语义Web服务匹配技术研究中,其中一个重要的研究主题就是语义Web服务匹配结果的排序机制。本文在综合概括和分析各种关于语义Web服务匹配结果排序机制的基础上,提出了一种基于语义距离度量模型的语义Web服务匹配结果排序机制,利用该排序机制,计算待匹配语义Web服务的语义相似度量,并依据此度量对语义Web服务匹配结果进行排序。该度量模型将语义Web服务引用概念间的语义关系转换成可精确比较的量化度量值,对属于相同语义匹配类型的匹配候选服务也能够分别计算语义距离,区分出相同匹配类型的候选服务与服务请求的匹配程度,从而达到改善用户对语义Web服务的搜索体验的目的。     

基于本体的语义Web服务通信协议的研究

在简单介绍语义W eb服务、本体的同时,将本体与通信协议结合,提出建立通信协议本体的概念,并给出协议本体的简单模型。将语义W eb服务中的核心SOAP协议引入到协议本体中,在服务机制中将语义引入消息传输机制,提高服务的灵活性以及适应性。还可减少事务处理中产生的不确定性。     

An ontology,intelligent agent-based framework for the provision of semantic web services

Intelligent agents and semantic web services are two technologies with great potential. Striking new applications can be developed by using the tools and techniques they provide. However, semantic web services need for an upper software entity able to deal with them and, on the other hand agent technology has historically suffered from a number of drawbacks that must be addressed. Integrating these two technologies in a joint environment can overcome their problems while strengthening their advantages. In this paper, the necessity for integrating these technologies and the potential benefits of their combination are analyzed. Based on this study, we present SEMMAS, an ontology-based framework for seamlessly integrating Intelligent Agents and Semantic Web Services. The basics of the framework are detailed and a proof-of-concept implementation described.     

Web Services with generic simulation models for discrete event simulation

Today the Internet and the World Wide Web (WWW) are on the cusp of a paradigm shift. Up to now most actions in the WWW are sorts of human–computer interaction, but the introduction of the eXtensible Markup Language (XML) changed the perception. The Internet will be seen as a great space of information and with the use of XML and following technologies like Web Services, Grid Computing and Semantic Web the difference between human–machine interaction and machine–machine interaction vanishes. This work investigates the usefulness of XML in the simulation domain and uses Web Service technology to build the SimASP framework for discrete event simulation (DES).     

Mapping Relational Databases to the Semantic Web with Original Meaning

Most of nowadays Web content is stored in relational databases. It is important to develop ways for representation of this information in the Semantic Web to allow software agents to process it intelligently. The paper presents an approach to translation of data, schema and the most important constraints from relational databases into the Semantic Web without any extensions to the Semantic Web languages.     

Effektive Handhabung von Service-Informationen im Internet der Dienste

Business Webs apply the idea of value networks to the WWW. The underlying delivery platform is commonly referred to as the Internet of Services and will certainly have to deal with a great variety and amount of information about services along several service information dimensions. As soon as brokerage, discovery, or community feedback parts are decentralized, there emerge a number of service information challenges (modeling the information in a holistic way, documentation, interlinkage, tool interoperability, distributed querying, inconsistent information, and cooperation of different stakeholders). In this paper, we propose to counter such service information challenges by two artifacts. First, we contribute a Service Ontology based on a sound and rigid foundational ontology. The Service Ontology provides a holistic and consistent way of capturing service information. We apply the recommendations of the W3C Semantic Web Activity whose recent standardization has already opened new possibilities for tool interoperability, interlinkage of information, and distributed querying on the web. However, building and prescribing an ontology in standardized languages is not enough to address all service information challenges. Therefore, as a second contribution, we provide a method around the ontology including a governance framework, guidelines for applying the W3C Semantic Web recommendations, a lifecycle-spanning tool chain, and different levels of applicability. We label our method Semantic Business Web approach, since we build on W3C Semantic Web standards, use and extend them in the Business Web setting. Both artifacts are constructed in an interdisciplinary way by experts participating in the German lighthouse project THESEUS/TEXO. The project’s scenario also serves as a proof of concept evaluation of the artifacts.     

基于Petri网的Web服务流程建模方法研究

随着网络应用的蓬勃发展,Web服务越来越普及。在实际应用中,往往需要对已有Web服务进行集成。目前通常的企业Web服务集成过程,都是先根据企业的业务流程建立相应的Web服务流程模型,再由此建立应用系统。而目前已有的建模手段的共同问题是：无法确保模型的正确性和与具体业务的紧密吻合。该文提出一种基于Petri网的Web服务流程建模方法。该建模方法通过将Petri网引入建模过程弥补了原建模过程中无法直观感受模型的不足,通过建立一套完备的形式化定义保证了建立模型的正确性,通过将紧同步随机Petri网引入建模过程可以更好的描述实际业务。通过使用该方法, 可以很好地解决现在Web流程建模过程中存在的问题。此方法也为其他领域中的流程建模仿真提供了一种很好的解决问题的方法和思路。     

ActiveRDF: Embedding Semantic Web data into object-oriented languages

Semantic Web applications share a large portion of development effort with database-driven Web applications. Existing approaches for development of these database-driven applications cannot be directly applied to Semantic Web data due to differences in the underlying data model. We develop a mapping approach that embeds Semantic Web data into object-oriented languages and thereby enables reuse of existing Web application frameworks.We analyse the relation between the Semantic Web and the Web, and survey the typical data access patterns in Semantic Web applications. We discuss the mismatch between object-oriented programming languages and Semantic Web data, for example in the semantics of class membership, inheritance relations, and object conformance to schemas.We present ActiveRDF, an object-oriented API for managing RDF data that offers full manipulation and querying of RDF data, does not rely on a schema and fully conforms to RDF(S) semantics. ActiveRDF can be used with different RDF data stores: adapters have been implemented to generic SPARQL endpoints, Sesame, Jena, Redland and YARS and new adapters can be added easily. We demonstrate the usage of ActiveRDF and its integration with the popular Ruby on Rails framework which enables rapid development of Semantic Web applications.     

语义Web服务主流建模框架比较分析

传统的Web服务技术缺乏机器可理解的语义,限制了Web服务的自动化。结合了语义Web技术和Web服务技术的语义Web服务应运而生,其中,语义Web服务的建模框架是当前研究重点。基于语义Web服务的一般基础结构,本文从行为、体系结构和服务本体的角度分析了当前语义Web服务三大主流建模框架OWL-S、IRS-II和WSMF的特点,比较了它们的异同,展望了语义Web服务建模框架的发展趋势。     

语义Web服务发现模型研究

语义Web服务的目标是使Web服务成为计算机可理解的实体,以便完成服务的自动发现、选择、调用、组合等。利用本体方法和服务本体描述语言是达到该目标的有效途径。本文重点是构建一个语义Web服务模型,并在此基础上给出一个服务请求实例来验证该模型的可行性。     

CUSTOMIZING THE INSTRUCTIONAL GRID

The Web contains hundreds of thousands of educational resources available any time and any place. However no smart technology is available to help teachers and students locate appropriate resources customized to their needs and social characteristics. When educational resources are indexed, it is often done by demographics, such as student age and grade. This article describes customized Grid Learning Services (GLS) that will personalize instruction based on an individual's presumed knowledge and cognitive and learning needs. The customized GLS will use real-time student modeling, the Semantic Web, intelligent agents, and pre-tests of cognitive, affective, and social characteristics to personalize the selection of educational resources and problems. Components of the customized GLS include an ontology construction agent, goal-based retrieval mechanisms, a lesson planner, and student and pedagogical agents.     

Creating Semantic Web contents with Protege-2000

As researchers continue to create new languages in the hope of developing a Semantic Web, they still lack consensus on a standard. The authors describe how Protege-2000, a tool for ontology development and knowledge acquisition, can be adapted for editing models in different Semantic Web languages.     

Managing semantic content for the Web

By associating meaning with content, the Semantic Web will facilitate search, interoperability, and the composition of complex applications. The paper discusses the Semantic Content Organization and Retrieval Engine (SCORE, see vvww.voquette.com), which is based on research transferred from the University of Georgia's Large Scale Distributed Information Systems. SCORE belongs to a new generation of technologies for the emerging Semantic Web. It provides facilities to define ontological components that software agents can maintain. These agents use regular expression based rules in conjunction with various semantic techniques to extract ontology-driven metadata from structured and semistructured content. Automatic classification and information-extraction techniques augment these results and also let the system deal with unstructured text.     

ITtalks: a case study in the Semantic Web and DAML+OIL

Semantic Web markup languages will improve the automated gathering and processing of information and help integrate multiagent systems with the existing information infrastructure. The authors, describe their ITtalks system and discuss how Semantic Web concepts and DAML+OIL extend its ability to provide an intelligent online service.