RDF Model Research Articles

Information Query and Integration Based on Distributed RDF(S) Model

在Web应用环境中,可以通过RDF(S)形式描述企业领域内分布信息资源的语义,以提高信息查询的准确性.提出了描述分布异构RDF(S)的分布RDF(S)模型,并基于这一模型给出了实现分布RDF(S)查询的方法,此查询方法既能实现实例层次的查询,也能实现概念层次的查询.基于这一方法,用户能够以统一的形式来查询,获取相关的信息资源,同时还可以实现分布RDF(S)的集成.;In the cases of Web applications, RDF(S) can be used to semantically describe the distributed information sources in enterprises to make the information retrieval more accurate. In this paper, a distributed RDF(S) model is presented to describe distributed and heterogeneous RDF(S)s. Based on this model, a method to query distributed RDF(S) descriptions is also presented, which can retrieve data of concepts as well as that of instances. By this method, users can retrieve RDF(S) descriptions and the information they describe in the same way and implement distributed RDF(S)s' integration.

Developing an agent‐based workflow management system for collaborative product design

PurposeThe purpose of this research is to develop a prototype of agent‐based intelligent workflow system for product design collaboration in a distributed network environment.Design/methodology/approachThis research separates the collaborative workflow enactment mechanisms from the collaborative workflow building tools for flexible workflow management. Applying the XML/RDF (resource description framework) ontology schema, workflow logic is described in a standard representation. Lastly, a case study in collaborative system‐on‐chip (SoC) design is depicted to demonstrate the agent‐based workflow system for the design collaboration on the web.FindingsAgent technology can overcome the difficulty of interoperability in cross‐platform, distributed environment with standard RDF data schema. Control and update of workflow functions become flexible and versatile by simply modifying agent reasoning and behaviors.Research limitations/implicationsWhen business partners want to collaborate, how to integrate agents in different workflows becomes a critical issues.Practical implicationsAgent technology can facilitate design cooperation and teamwork communication in a collaborative, transparent product development environment.Originality/valueThis research establishes generalized flow logic RDF models and an agent‐based intelligent workflow management system, called AWfMS, based on the RDF schema of workflow definition. AWfMS minimizes barriers in the distributed design process and hence increases design cooperations among partners.

Using TRIPLE for business agents on the Semantic Web

This paper presents TRIPLE [Sintek and Decker, First International Semantic Web Conference, 2002], a modular rule language for the Semantic Web [Weaving the Web, The Original Design and Ultimate Destiny of the World Wide Web by Its Inventor, 1999], and its usage for business agents. TRIPLE is based on Horn logic [Foundations of Logic Programming, 1984] and borrows many basic features from F-Logic [J. ACM 42 (1995) 741] but is especially designed for querying and transforming RDF models [ http://www.w3.org/RDF/]. TRIPLE can be viewed as a successor of SiLRI (Simple Logic-based RDF Interpreter [QL’98—The Query Languages Workshop, 1998]). One of the most important differences to F-Logic and SiLRI is that TRIPLE does not have fixed semantics for object-oriented features like classes and inheritance. Its modular architecture allows such features to be easily defined for different object-oriented and other data models like UML, Topic Maps, or RDF Schema [ http://www.w3.org/TR/2000/CR-rdf-schema-20000327/]. Description logics extensions of RDF (Schema) like OIL [ http://www.ontoknowledge.org/oil/] and DAML+OIL [ http://www.daml.org/2001/03/daml+oil-index.html] that cannot be fully handled by Horn logic are provided as modules that interact with a description logic classifier, e.g. FaCT [ http://www.cs.man.ac.uk/~horrocks/FaCT/], resulting in a hybrid rule language. This paper sketches syntax and semantics of TRIPLE and shows how it can be used to declaratively specify the behavior of (business) agents.

Analysis of the Fröhlich Metastable States

A detailed analysis of the metastable states of two interactingmonomer units, supplied with energy by an external energy pumpingsystem, assigned here as Fröhlich states, is presented, whichincludes the analysis of the criteria of the system stability as well.The basic starting point of this analysis is the hamiltonian of themicroscopic RDF model, which offers a unified theory of the well knownDavydov and Fröhlich models of energy transport in proteins. Ourresults show that Fröhlich’s metastable states could not beconsidered as a many body effect, because every pair of interactingcomplex monomer units, in which vibronic excitations could be excited,will prefer states with higher ordering of the dipole momenta,corresponding to lower system energy. This is a consequence of thesoftening of the dipole oscillation modes, caused by the monomerdeformation, which is connected with the vibrations of the monomerconstituents.

Atomic arrangement of a zinc-tellurite glass

By means of the neutron diffraction method the atomic arrangement of a zinc-tellurite glass with composition 80% TeO 2 + 20 mol% ZnO has been studied. Analysis of the radial distribution functions (RDF exp and RDF model) shows the presence of some changes in the basic structural units at the glass transition. Approximately 35% of the Te atoms conserve the same coordination state as in the α-TeO 2 crystal structure. The remaining Te atoms are of lower coordination. The Gaussian distribution of the OO distances of the first coordination sphere ( R = 2.95 Å) indicates an increasing assymmetry of TeO 4, TeO 3+1, TeO 3 and ZnO 4+1+1 polyhedra. The observed variations of the TeTe, Tesecond O and Osecond O distances greater than 3.0 Å have an essential contribution to tellurite melt amorphization. An attempt is made to give a stereochemical representation of the glass structure on the basis of the obtained RDF exp.