This dissertation studies several security issues in data networks, to reveal the vulnerability, to propose defense mechanisms, to provide better tools for analysis, and to develop good security architecture. This dissertation consists of the following three parts: (1) Internet-like topologies...

This paper discusses a social process model for design activity in organizational IS development projects,based upon the findings of an interpretive, participant observation study of information system designprocesses in a mid-sized UK telecommunications equipment manufacturing company. The form...

This study was conducted on the premise that if quality business information is provided to business enterprises, socio-economic transformation could be achieved. The study emanated from the documented problem where business enterprises in northern Uganda were found to depend on "word of mouth"...

The purpose of this research was to address the shortcomings of the daily activity schedule model and introduce changes in the model system in order to more fully utilize the potential benefits of such a system. The major problem with the previously developed model was its full reliance on the...

In this dissertation we study problems associated with the sharing of computer and information resources. The first two essays examine optimal pricing mechanisms in Distributed Computing Systems from a theoretical and experimental perspective. We build a theoretical model of a computing grid...

ENGLISH ABSTRACT: Several studies have shown that abnormal returns can be generated simply by buying past winning stocks and selling past losing stocks. Being able to predict future price behaviour by past price movements represents a direct challenge to the Efficient Market Hypothesis, a...

In today’s business environment it is widely accepted that innovation is key to improving theeconomic performance of companies (Van der Panna et al. 2003) and for achieving andsustaining a competitive advantage in the market place.Based on the definition of radical innovation, a radical...

This thesis explores the innovation survival issue. As role players in an increasinglyglobal marketplace, businesses acknowledge that regular and constant innovation isthe key to remaining competitive. In other words, in order to be successful, businessesare compelled to operate and produce...

ENGLISH SUMMARY: The research documents the development of a conceptual framework, the improbable circumstances strategic (ICS) framework, which guides organisations in the preparation for improbable circumstances.Four fields include: strategic management, innovation, systems thinking and...

South Africa has an uneven distribution of economic wealth. The political history of recentdecades is the main reason for this phenomenon and has led to a situation where vastnumbers of citizens did not receive the necessary training and development to embark onself-employment or to be employed...