As context-aware (and more specifically location-aware) computing enters the scene of Internet computing, different location determination techniques are widely accepted. Although accuracy of some of them is quite good for finegrained location data gathering, none of these techniques provides a good balance between cost of ownership (infrastructure), accuracy and ease of use. In this paper we p...

In many business and science applications, it is important to track trends over historical data, for example, measuring the monthly prevalence of influenza incidents at a hospital. In situations where a machine learning classifier is needed to identify the relevant incidents from among all cases in the database, anything less than perfect classification accuracy will result in a consistent and ...

Web services security is becoming a critical concern for any organization adopting the XML-based Web services approach to application integration. While many access control techniques for Web services are becoming available, several issues still need to be solved in order to correctly split the burden of securing Web services between the perimetral and the service level. In this paper, a techni...

This paper reports on an in-depth case study of a large and strategic IT development project facing business user disengagement and potential system rejection. Somewhat belatedly senior management recognised the threat and appointed a new project manager with a brief to rescue the project whilst keeping to the original implementation deadline. Much to almost everyone's surprise the new project ...

1 Abstract Two types of errors can be associated with classifying data into two categories A and B: misclassifying an item in A as one of B and, conversely, misclassifying an item in B as one of A. Tight control over these two errors is needed in many practical situations. For example, an error of one type may have far more serious consequences than one of the other type. Most previous work on ...

Treating control as an asset that can be bought and sold, we introduce a model of the simultaneous and separable trading of ownership and control in a private information setting. The model provides a novel explanation for the prevalence and persistence of the separation of ownership from control in modern corporations: efficiency in the market for corporate control is more easily achieved when...

This study examines the corporate investment behavior during China’s reform era. We apply the Generalized Method of Moments (GMM) estimation to the investment Euler equation models that characterize the Chinese firms’ investment decisions. Based on the estimated structural parameters, we derive the effective discount rate (“implied” cost of capital) perceived by the firm managers to decide inve...

The financial impact of IT involves both tangible and intangible social and technical costs. The problem of measuring “true” costs and benefits of IT investments is a complex problem and has caused researchers to focus on issues such as the productivity paradox, total cost of ownership, and cost taxonomies. This task becomes even more complicated when considering technologies that impact a vari...

The life of engine components is determined by a combination of the material properties and the applied stresses and temperatures. As a consequence of variability in these parameters, the component life is not fixed (deterministic) but stochastic (random) and may be characterised by a probability density function (PDF). In order to reduce the cost of ownership of ADF aircraft these PDFs need to...