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 ...

In spite of the intense efforts of metrics researches, the impact of object-oriented software metrics is for the moment still quite reduced. The cause of this fact lies not in an intrinsic incapacity of metrics to help assessing and improving the quality of object-oriented systems, but in an unsystematic, dispersed and ambiguous manner of defining and using the metrics. In this paper we define ...

This paper presents the EarthTutor authoring tool, a multi-layered system designed to remove the technical hurdles preventing teachers from having full control over the structure of their lessons, without sacrificing the power and technical flexibility required for an effective ITS implementation. EarthTutor reduces the ITS design problem to a series of related but independent layers. Each laye...

– The goal of this research was to design a multi-layered architecture for the detection of a wide range of existing and new botnets. By not relying on a single technique but rather building in the ability to support multiple techniques, the goal is to be able to detect a wider array of bots and botnets than is possible with a single technique. The open architecture and API will allow any techn...

Smart urban-level applications require high-fidelity and high-resolution models. This circumstance has raised the interest in computational models of mass, energy, and information flows in the urban context. Toward this end, we focus in the present contribution on a multilayered approach to urban energy computing. The variance in the spatial and temporal resolution of the queries' purpose and i...

XML Canonicalization enables reliable textual and binary comparison of XML documents through the removal of irrelevant differences in structure and content. Though XML Canonicalization is critical for XML Signatures, it also has value in other XML applications such as version control. Currently, the approach to XML Canonicalization is to write a single specification that details how all parts o...