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The aim of this article is to present and discuss selected commercial user modeling systems against the background of deployment requirements in real-world environments. Following the recent trend towards personalization on the World Wide Web, these systems are mainly aimed at supporting e-commerce including customer relationship management. In order to(More)
Due to the tremendously increasing popularity of the WorldWide Web, hypermedia is going to be the leading online information medium for some years to come and will most likely become the standard gateway for citizens to the " information highway ". Already today, visitors of web sites are generally heterogeneous and have different needs, and this is likely(More)
Representation components of user modeling servers have been traditionally based on simple file structures and database systems. We propose directory systems as an alternative, which offer numerous advantages over the more traditional approaches: international vendor-independent standardization, demonstrated performance and scalability, dynamic and(More)
The N24 Web site [6] belongs to a network of sites operated by Kirch Group that complement associated television stations in Germany. The relaunch of the N24 site focuses on tighter integration with the N24 cable news brand, targeting managers in need of accurate real-time information delivery in the areas of investing, business, politics, and sports. The(More)
Users of publicly accessible information systems are generally heterogeneous and have different needs. The aim of the AVANTI project is to cater to these individual needs by adapting the user interface and the content and presentation of WWW pages to each individual user. The special needs of elderly and handicapped users are also partly considered. A model(More)
Before user modeling servers can be deployed to real-world application environments with potentially millions of users, their runtime behavior must be experimentally verified under realistic workload conditions to ascertain their satisfactory performance in the target domain. This paper discusses performance experiments which systematically vary the number(More)
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