This paper presents an approach to authoring support for Web courseware based on a layered ontological paradigm. The ontology-based layers in the courseware authoring architecture serve as a basis for formal semantics and reasoning support in performing generic authoring tasks. This approach represents an extension of our knowledge classification and indexing mechanism from a previously develop...

The omnipresent integration of computer technology in everyday applications introduces new opportunities to make software systems aware of the context in which they are used. Such context-aware systems can respond more adequately to user expectations. However, modelling the context influence inside of software systems burdens developers for several reasons. First, context-dependent behaviour mi...

The Web has become the largest available repository of data. The exponential growth and the fast pace of change of the web makes really hard to retrieve all relevant information. The crawling of web pages with speed for finding relevant set of document is perhaps the main bottleneck for Web search engines. There are many factors that affect web search such criteria

The simulation of computer systems requires representative, reliable workload models. When simulating computer systems or components that are influenced by user behavior, this very behavior has to be modeled by using mathematical means. In this article, we propose a user behavior model framework that is constructed in a top down manner, consisting of various layers. Layers offer services to the...

In this paper we consider techniques for designing and analysing distributed security transactions. We present a layered approach, with a highlevel security transaction layer running on top of a lower-level secure transport protocol. The secure transport protocol provides protection against dishonest outsiders, while the transaction layer can be designed to provide protection against dishonest ...