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While frameworks and application programming interfaces for virtual reality are commonplace today, designing scenarios for virtual environments still remains a tedious and time consuming task. We present a new authoring tool which combines scene assembly and visual programming in a desktop application with instant testing, tuning and planning in an… (More)
We present the prototype omVR, which is a Virtual Reality based safety training system in a petroleum refinery. It provides an advanced technique for personnel safety training and allows users to navigate through the training setup and interact with parts of the refinery. By using a head mounted display a high degree of immersion is achieved. omVR is the… (More)
Applying object-oriented technology to systems development is widely recognized as improving productivity and reducing system maintenance costs. At the same time, relational technology has gained leverage in most businesses. There exist already several proposals to combine object-oriented programming with relational database systems. Yet, existing… (More)
Online Analytical Processing (OLAP) data is frequently organized in the form of multidimensional data cubes each of which is used to examine a set of data values, called measures, associated with multiple dimensions and their multiple levels. In this paper, we first propose a conceptual multidimensional data model, which is able to represent and capture… (More)
This paper classifies a collection of semantic data models within a framework consisting of the following comparison-criteria: classification, aggregation, generalization and association (resp. cover aggregation).
A broad spectrum of tourism information is already distributed over various web sites. However, a major problem for the tourist is to find these web sites and to deal with the differences concerning information presentation and information access. At the same time, it is not feasible to store every kind of information a tourist might be interested in at one… (More)