The information in this document is subject to change without notice. The Members of the PROLEARN... more The information in this document is subject to change without notice. The Members of the PROLEARN Consortium make no warranty of any kind with regard to this document, including, but not limited to, the implied warranties of merchantability and fitness for a particular purpose. The Members of the PROLEARN Consortium shall not be held liable for errors contained herein or direct, indirect, special, incidental or consequential damages in connection with the furnishing, performance, or use of this material.
TRIPLE was designed as a practical rule language for data manipulation applications. Over the las... more TRIPLE was designed as a practical rule language for data manipulation applications. Over the last couple of years the language has been deployed in various applications and use case studies. In this paper we first introduce the design principles of TRIPLE and then present some of the applications for which this language has been used.
This chapter introduces the general vision of the Social Semantic Desktop (SSD) and details it in... more This chapter introduces the general vision of the Social Semantic Desktop (SSD) and details it in the context of the NEPOMUK project. It outlines the typical SSD requirements and functionalities that were identified from real world scenarios. In addition, it provides the design of the standard SSD architecture together with the ontology pyramid developed to support it. Finally, the chapter gives an overview of some of the technical challenges that arise from the actual development process of the SSD.
In current Information Society, being informed is a basic necessity. As one of the main news busi... more In current Information Society, being informed is a basic necessity. As one of the main news business actors, news agencies are required to provide fresh, relevant, high-quality information to their customers. Dealing with this requirement is not an easy task, but use of Semantic Web technologies can help news agencies in achieving this goal. This paper addresses the issues at hand as they have been treated in the NEWS project.
Peer-to-peer networks are envisioned to be deployed for a wide range of applications. However, P2... more Peer-to-peer networks are envisioned to be deployed for a wide range of applications. However, P2P networks evolving in an unorganized manner suffer from serious scalability problems, limiting the number of nodes in the network, creating network overload and pushing search times to unacceptable limits. We address these problems by imposing a deterministic shape on P2P networks: We propose a graph topology which allows for very efficient broadcast and search, and we describe a broadcast algorithm that exploits the topology to reach all nodes in the network with the minimum number of messages possible. We provide an efficient topology construction and maintenance algorithm which, crucial to symmetric peer-to-peer networks, does neither require a central server nor super nodes in the network. Nodes can join and leave the self-organizing network at any time, and the network is resilient against failure. Moreover, we show how our scheme can be made even more efficient by using a global ontology to determine the organization of peers in the graph topology, allowing for efficient concept-based search.
Proceedings of the 11th International Conference on World Wide Web, WWW '02, 2002
Metadata for the World Wide Web is important, but metadata for Peer-to-Peer (P2P) networks is abs... more Metadata for the World Wide Web is important, but metadata for Peer-to-Peer (P2P) networks is absolutely crucial. In this paper we discuss the open source project Edutella which builds upon metadata standards defined for the WWW and aims to provide an RDFbased metadata infrastructure for P2P applications, building on the recently announced JXTA Framework. We describe the goals and main services this infrastructure will provide and the architecture to connect Edutella Peers based on exchange of RDF metadata. As the query service is one of the core services of Edutella, upon which other services are built, we specify in detail the Edutella Common Data Model (ECDM) as basis for the Edutella query exchange language (RDF-QEL-i) and format implementing distributed queries over the Edutella network. Finally, we shortly discuss registration and mediation services, and introduce the prototype and application scenario for our current Edutella aware peers.
In the current Information Society, being informed is a basic necessity. As one of the main news ... more In the current Information Society, being informed is a basic necessity. As one of the main news bussiness actors, news agencies are required to provide fresh, relevant, high-quality information to their customers. Dealing with this requirement is not an easy task, but, as partners of the NEWS (News Engine Web Services) project, we believe that the usage of Semantic Web technologies could help news agencies in achieving that objective. In this paper we will describe the aims and main achievements of the NEWS project, that was ...
Personal Learning Environments (PLEs) are attracting increasing interest in the e-learning domain... more Personal Learning Environments (PLEs) are attracting increasing interest in the e-learning domain. PLEs may be characterised in a multidimensional space. Examples of PLEs are discussed.
THE RECOGNITION THAT KNOWLedge is one of an enterprise's most important assets, decisively influe... more THE RECOGNITION THAT KNOWLedge is one of an enterprise's most important assets, decisively influencing its competitiveness, has fueled interest in comprehensive approaches to the basic activities of knowledge management: the identification, acquisition, development, dissemination, use, and preservation of the enterprise's knowledge. Traditionally, enterprises have addressed knowledge management from either a management or a technological point of view. Managers understand that the knowledge their employees possess is one of their company's most valuable assets. They are concerned with the effective use of personal knowledge and the qualitative and quantitative adaptation of this knowledge toward a changing environment. The technological approach, by contrast, deals with questions about what information technology should be provided to support knowledge management. 1 We find that effective knowledge management requires a hybrid solution, one that involves both people and technology. 2 As this article shows, our long-term vision is a corporate or organizational memory at the core of a learning organization, supporting sharing and reuse of individual and corporate knowledge and lessons learned. Arranged around such an OM, intelligent knowledgemanagement services actively provide the user working on a knowledge-intensive operational task with all the information necessary and useful for fulfilling this task (see ).
An Organizational Memory is an enterprise-internal application-independent information and assist... more An Organizational Memory is an enterprise-internal application-independent information and assistant system. It integrates various techniques and tools to support knowledge management. Motivated by the growing need for enterprise-wide knowledge management we performed several studies and identified the functional requirements for an Organizational Memory. To cope with these we propose a three-layered architecture for representing the knowledge. On this basis, the Organizational Memory shall serve as an intelligent assistant to the user and process both formal and non-formal knowledge elements in a task-oriented way. The concepts described here are the object of ongoing research, but are employed and tested in several application projects which run in parallel.
The KnowMore project aims at providing active support to humans working on knowledge-intensive ta... more The KnowMore project aims at providing active support to humans working on knowledge-intensive tasks. To this end the knowledge available in the modeled business processes or their incarnations in specific workows shall be used to improve information handling. We present a representation formalism for knowledge-intensive tasks and the specification of its object-oriented realization. An operational semantics is sketched by specifying the basic functionality of the Knowledge Agent which works on the knowledge intensive task representation. The Knowledge Agent uses a meta-level description of all information sources available in the Organizational Memory. We discuss the main dimensions that such a description scheme must be designed along, namely information content, structure, and context. On top of relational database management systems, we basically realize deductive object-oriented modeling with a comfortable annotation facility. The concrete knowledge descriptions are obtained by...
An Organizational Memory (OM) captures, stores and disseminates valuable corporate knowledge and ... more An Organizational Memory (OM) captures, stores and disseminates valuable corporate knowledge and is thus a central prerequisite for enterprise knowledge management. For structuring, accessing, and maintaining large amounts of heterogeneous information, appropriate meta-level descriptions are needed which specify the structure, content, and potential usage of the object-level knowledge. Such meta-level descriptions are provided for data in the form of data models, for formal knowledge as ontologies, and for informal documents as document descriptors. In this paper, we sketch an ontology-based approach for comprehensive meta-modeling and retrieval of heterogeneous data, formal knowledge, and documents. We identify information ontology, domain ontology, and enterprise ontology as main contributors to a vocabulary for comprehensive information meta modeling. We elaborate a bit on the underlying representation formalism, sketch a sample scenario, and present ontology-based he...
From an IT point of view, a key objective of successful knowledge management is to provide releva... more From an IT point of view, a key objective of successful knowledge management is to provide relevant and necessary information at the right time to support humans in accomplishing their tasks. This paper presents a prototypical system which meets this objective in an enterprise environment. Based on context information associated with the enterprise's business processes, an integration of work¯ow engine and information assistant enables active presentation of relevant information to the user. We describe the functionality of the system and elaborate (i) on necessary extensions to the business process models, (ii) the ontologies used for information modeling, and (iii) the integration of work¯ow engine and active information assistant. The prototype system has been developed in the KnowMore project of the DFKI Knowledge Management Group.
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Papers by M. Sintek