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Aufsatz
Dual retrieval in conceptual information systems
(1999)
Conceptual Information Systems provide a multi-dimensional conceptually structured view on data stored in relational databases. On restricting the expressiveness of the retrieval language, they allow the visualization of sets of realted queries in conceptual hierarchies, hence supporting the search of something one does not have a precise description, but only a vague idea of.
Information Retrieval is considered as the process of finding specific objects (documents etc.) out of a large set of objects which fit to ...
Aufsatz
Hierarchies of conceptual scales
(1999)
Formal Concept Analysis allows to derive conceptual hierarchies from data tables. Formal Concept Analysis is applied in various domains, e.g., data analysis, information retrieval, and knowledge discovery in databases. In order to deal with increasing sizes of the data tables (and to allow more complex data structures than just binary attributes), conceputal scales habe been developed. They are considered as metadata which structure the data conceptually. But in large applications, the number of conceptual scales ...
Aufsatz
Das Jahr 2000 Problem - Sorgen mit der Zeit?
(1999)
Vortrag beim Treffen Lions Club Kassel Brüder Grimm am 20. August 1999.
In der Zeit vor der Jahrtausendwende gab es Bedenken, dass größere Probleme durch die übliche Darstellung der Jahresangabe mit nur zwei Ziffern entstehen würden, weil Rechner nicht zwischen 1900 und 2000 unterscheiden könnten. Als Beispiel genannt wurden Fahrstühle, die seit 100 Jahren nicht mehr gewartet wurden und daher stehenbleiben. Tatsächlich ist dann sehr wenig passiert, ob wegen der lebhaften Diskussion vorher oder nicht, ist umstritten. ...
Aufsatz
Conceptual structures represented by conceptual graphs and formal concept analysis
(1999)
Conceptual Graphs and Formal Concept Analysis have in common basic concerns: the focus on conceptual structures, the use of diagrams for supporting communication, the orientation by Peirce's Pragmatism, and the aim of representing and processing knowledge. These concerns open rich possibilities of interplay and integration. We discuss the philosophical foundations of both disciplines, and analyze their specific qualities. Based on this analysis, we discuss some possible approaches of interplay and integration.
Aufsatz
Acquiring expert knowledge for the design of conceptual information systems
(1999)
Conceptual Information Systems unfold the conceptual structure of data stored in relational databases. In the design phase of the system, conceptual hierarchies have to be created which describe different aspects of the data. In this paper, we describe two principal ways of designing such conceptual hierarchies, data driven design and theory driven design and discuss advantages and drawbacks. The central part of the paper shows how Attribute Exploration, a knowledge acquisition tool developped by B. Ganter can be ...
Aufsatz
Numerical aspects in the data model of conceptual information systems
(1999)
While most data analysis and decision support tools use numerical aspects of the data, Conceptual Information Systems focus on their conceptual structure. This paper discusses how both approaches can be combined.
Aufsatz
Reuse in the development process of TOSCANA systems
(1999)
TOSCANA is a graphical tool that supports the human-centered interactive processes of conceptual knowledge processing. The generality of the approach makes TOSCANA a universal tool applicable to a variety of domains. Only the so-called conceptual scales have to be designed for new applications. The presentation shows how the use of abstract scales allows the reuse of formerly defined conceptual scales. Furthermore it describes how thesauri and conceptual taxonomies can be integrated in the generation of conceptual scales.