Matthias Hemmje

From Integrated Publication and Information Systems to Information and Knowledge Environments

Advanced Technologies for Adaptive Information Management Systems.- An Overview on Automatic Capacity Planning.- Overview on Decentralized Establishment of Multi-lateral Collaborations.- Dynamic Maintenance of an Integrated Schema.- Efficient Evaluation of Nearest-Neighbor Queries in Content-Addressable Networks.- Semantic Web Drivers for Advanced Information Management.- Ontology-Based Query Refinement for Semantic Portals.- Towards Supporting Annotation for Existing Web Pages Enabling Hyperstructure-Based Searching.- Maintaining Dublin Core as a Semantic Web Vocabulary.- Securing Dynamic Media Content Integration and Communication.- A Peer-to-Peer Content Distribution Network.- Secure Production of Digital Media.- Data Communication Between the German NBC Reconnaissance Vehicle and Its Control Center Unit.- From Digital Libraries to Intelligent Knowledge Environments.- The Role of Digital Libraries in Moving Toward Knowledge Environments.- Scientific Work and the Usage of Digital Scientific Information - Some Notes on Structures, Discrepancies, Tendencies, and Strategies.- Queries in Context: Access to Digitized Historic Documents in a Collaboratory for the Humanities.- Separation of Concerns in Hypertext: Articulation Points That Increase Flexibility.- Towards a Common Framework for Peer-to-Peer Web Retrieval.- Comparative Evaluation of Cross-language Information Retrieval Systems.- Personalization for the Web: Learning User Preferences from Text.- Collaborative Machine Learning.- Visualization - Key to External Cognition in Virtual Information Environments.- Visualization in Digital Libraries.- Modelling Interactive, Three-Dimensional Information Visualizations.- A Knowledge Integration Framework for Information Visualization.- Visualizing Association Rules in a Framework for Visual Data Mining.- From Human Computer Interaction to Human Artifact Interaction.- From Human-Computer Interaction to Human-Artefact Interaction: Interaction Design for Smart Environments.- Cooperation in Ubiquitous Computing: An Extended View on Sharing.- A Metaphor and User Interface for Managing Access Permissions in Shared Workspace Systems.- Ambient Intelligence: Towards Smart Appliance Ensembles.- Application Domains for Virtual Information and Knowledge Environments.- Enterprise Information Integration - A Semantic Approach.- Ontology-Based Project Management for Acceleration of Innovation Projects.- Understanding and Tailoring Your Scientific Information Environment: A Context-Oriented View on E-Science Support.- TV Scout: Lowering the Entry Barrier to Personalized TV Program Recommendation.- Intelligent Home-Enjoying Computing Anywhere.

ADMIRE: an adaptive data model for meta search engines

Abstract Considering the diversity among search engines, efficient integration of them is an important but difficult job. It is essential to provide a data model that can provide a detailed description of the query capabilities of heterogeneous search engines. By means of this model, the meta-searcher can map users queries into specific sources more accurately, and it can achieve good precision and recall. Moreover, it will benefit the selection of target source and computing priority. Because new search engines emerge frequently and old ones are updated when their function and content change, the data model needs good adaptivity and scalability to keep in step with the rapidly developing World Wide Web. This paper gives a formal description of the query capabilities of heterogeneous search engines and an algorithm for mapping a query from a general mediator format into the specific wrapper format of a specific search engine. Compared with related work, the special features of our work are that we focus more on the constraint of/between the terms, attribute order, and the impact of logical operator restraints. The contribution of our work is that we offer a data model that is both expressive enough to meticulously describe the query capabilities of current World Wide Web search engines and flexible enough to integrate them efficiently.

Adaptively constructing the query interface for meta-search engines

With the exponential growth of information on the Internet, current information integration systems have become more and more unsuitable for this Internet age due to the great diversity among sources. This paper presents a constraint-based query user interface model, which can be applied to the construction of dynamically generated adaptive user interfaces for meta-search engines.

Virgilio: a non-immersive VR system to browse multimedia databases

The authors introduce Virgilio, a system which supports the construction of non-immersive VR-based visualizations of complex data objects representing the result of a query performed on a multimedia database. Virgilio takes as input the dataset resulting from a query, on a generic database, displays attribute values of the dataset on virtual world objects according to the capability of these objects to represent the proper type of data, represents semantic relationships among the objects in the dataset using the containment relationship and creates a corresponding visual representation composed of a collection of virtual reality modeling language scenes.

A 3D Based User Interface for Information Retrieval Systems

The paper describes how 3D-based visualization and interaction techniques can be used in information retrieval user interfaces. It demonstrates that information retrieval systems based on state of the art retrieval models can be supplied with an intuitive interface functionality by applying the cone-tree metaphor for the visualization of content spaces. The natural ability of humans for spatial perception, orientation and spatial memories is outlined as an advantage in the process of perceiving information spaces by means of spatial metaphors. It is shown how the models, concepts and mechanisms of the retrieval system underlying its user interface can become more transparent and perceptible for the user at the interface level and how some of the cognitive costs of navigations in information spaces can be reduced. This goal is achieved by transforming document-term networks with two levels of abstraction into hierarchical and directed cone trees that use the spatial depth of 3D to achieve an easy perception of their topological structure. Finally the paper presents a 3D-based information system user interface which gives the user intuitive control over content-oriented search paths resulting in a query generation for the underlying automatic retrieval mechanisms. In order to improve the presentation of the query results as well, it is shown that 3D-based graphical metaphors can provide very intuitive ways of perceiving the relevance of the result in accordance to the query.

Digital libraries in knowledge management: an e-learning case study

Knowledge and libraries – this conceptual symbiosis is as old as the idea of libraries itself: libraries collect artifacts of explicated knowledge and make them available for building up new knowledge in all areas of everyday life. Learning and qualification management support are further essential links in the knowledge supply chain, which starts at the expert knowledge of an author and ends at the targeted enhancement of another person’s individual knowledge. Digital libraries and e-learning systems are thus important enabling technologies for the knowledge supply chain in the digital age.The e-Qualification project presented in this paper combines digital library, e-learning, and authoring support into an adaptable qualification management framework that provides integrated support and mediation for the various stakeholders involved in the qualification management process.

LectureLounge – experience education beyond the borders of the classroom

Capturing presentations (lectures, seminars, etc.) on video is on the brink of becoming a normal event in educational environments. However, a breakthrough has yet to occur. Why is this so? First, it seems that capturing purely video is not enough to capture the whole educational experience [4]. Second, while equipment is relatively cheap, the amount and quality of manual work needed to operate capturing and publication systems is very high, and thus so are the costs. Third, systems that support the capturing process by including additional metadata tend to be intrusive on the presenter’s way of working.We would like to introduce LectureLounge [3], a presentation capturing, management, and publication system that shows that it does not have to be this way.

Using link types in Web page ranking and filtering

Corresponding to the evolution of the Web from the poorly structured towards more structured, semantic rich network, search methods that apply to it are also evolving from using little structural and semantic information to using more such information that is available. This paper proposes a ranking and filtering mechanism that makes use of link types that is representable with new Web standards. We suggest that page ranking can be propagational through links and the propagational rates depend on the types of the links and users specific set of interests. Page filtering can be decided based on link types combined with some other information relevant to links. For either a ranking or filtering task, a profile containing a set of ranking or filtering rules to be followed in the task can be specified to reflect users specific interests. Technical issues in implementing the mechanism in a search system are also discussed.

Towards the Virtual Internet Gallery

The still rapidly growing Internet offers new ways to reach an increasing number of people in all areas of life. More and more companies take advantage of this fact by advertising and selling their products through this new electronic media. Art is a great example for using this new approach, because the visualization is the most important aspect and the physical presence of the exhibited object has just a secondary significance for the buying process, in contrary to other products (e.g. instruments, perfume, cars, etc.). This paper introduces an electronic service for galleries and artists to exhibit their artwork on the Internet easily and efficiently. The Virtual Internet Gallery (TVIG) utilizes a database to offer fast search functionality and performs a 3D visualization of the users query result, applying VRML. Users, who are interested in the exhibited art, can contact the gallery or artist directly through the system.

Supporting dynamic information visualization with VRML and databases

Nowadays, many state-of-the-art user interfaces to complexly structured data collections require appropriate information visualization methods. With the increase in graphics performance available on client systems, methods for three-dimensional visualization can be applied more easily. The conceptual approach presented in this paper dynamically generates threedimensional VRML scenes from information stored in database systems. To achieve this, VRML is extended with new nodes for supporting the server side generation of VRML scenes and for supporting trigger mechanisms. An implementation of the introduced concept is introduced by means of an object relational database system which is extended with a new VRML data type and its related functions. Altogether, these concepts and software components provide a platform for server-based information visualization mechanisms.