Mario Christ

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The geographic distribution and host range of Borna disease (BD), a fatal neurologic disease of horses and sheep, are larger than previously thought. The etiologic agent, Borna disease virus (BDV), has been identified as an enveloped nonsegmented negative-strand RNA virus with unique properties of replication. Data indicate a high degree of genetic(More)
The number and variety of Web sites offering information, commerce and services has multiplied since 1995. The number of users making use of the Internet and the Web has also grown tremendously. Yet at the level of the individual, little is known about the trajectory of change over time in number of visits to Web sites. Drawing upon recent advances in(More)
Even though we have seen an exponential growth in the number of Web sites and the number of users, little is known about Web usage at the level of the individual. This paper aims to overcome this lack of knowledge on individual usage patterns. Based on previous findings on saturation of Web usage, we use data from 1995-1998 on residential Web usage(More)
This paper reports the results of a study of Web usage of 139 users over a 8 month period of time. It uses a longitudinal Web log analysis of the URLs accessed during 33916 user-days of Web usage. It aims to detect changes in Web usage associated with increased experience of using the Web. Specifically, it answers the question whether or not users shift(More)
Metadata in environmental management systems support searching and browsing operations. XML-based metadata systems can store metadata in a flexible manner that is suitable also for small and medium size organizations. Our EcoExplorer software package consists of three closely cooperating programs for the management of XML-based environmental metadata. It is(More)
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