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ACM Transactions on Information Systems (TOIS), Volume 12 Issue 1, Jan. 1994

Evaluating hypermedia and learning: methods and results from the Perseus Project
Gary Marchionini, Gregory Crane
Pages: 5-34
DOI: 10.1145/174608.174609
The Perseus Project has developed a hypermedia corpus of materials related to the ancient Greek world. The materials include a variety of texts and images, and tools for using these materials and navigating the sytem. Results from a three-year...

A nested-graph model for the representation and manipulation of complex objects
Alexandra Poulovassilis, Mark Levene
Pages: 35-68
DOI: 10.1145/174608.174610
Three recent trends in database research are object-oriented and deductive databases and graph-based user interfaces. We draw these trends together in a data model we call the Hypernode Model. The single data structure of this model is the...

On the expressive power of query languages
Peter Schäuble, Beat Wüthrich
Pages: 69-91
DOI: 10.1145/174608.174611
Two main topics are addressed. First, an algebraic approach is presented to define a general notion of expressive power. Heterogeneous algebras represent information systems and morphisms represent the correspondences between the instances of...

Probabilistic information retrieval as a combination of abstraction, inductive learning, and probabilistic assumptions
Norbert Fuhr, Ulrich Pfeifer
Pages: 92-115
DOI: 10.1145/174608.174612
We show that former approaches in probabilistic information retrieval are based on one or two of the three concepts abstraction, inductive learning, and probabilistic assumptions, and we propose a new approach...