For some computing systems failure is rare enough that it can be ignored. In others, failure is common and software design considerations can have a significant impact upon the performance of applications running on the systems. In this paper, we discuss software design issues that should be considered whenever jobs execute in unreliable computing environments. Specifically, we show that if pro...

Complementary to performance evaluation, performance testing of communicating protocols is a qualitative and quantitative test of a system, aiming at checking whether performance requirements of protocols have been satisfied under certain conditions. It raises an interesting issue of accurately formalizing specified performance requirements by taking consideration of data values of the protocol...

Contemporary approaches to software performance engineering su er from weak integration with the design process and provide little feedback to developers. An approach to software performance modelling is presented, based on annotating design speci cations with performance parameters and operational analysis of queueing networks representing the hardware. Analytical sensitivity analysis is provi...

Dynamic performance stubs provide a framework for the simulation of the performance behavior of software modules and functions, allowing many to be used as an extension to software performance engineering methodologies. The methodology of dynamic performance stubs can also be used for gain oriented performance improvements and it is also possible to identify “hidden” bottlenecks and to prioriti...

Objective: Information Retrieval (IR) is strongly rooted in experimentation where new and better ways to measure and interpret the behavior of a system are key to scientific advancement. This paper presents an innovative visualization environment: Visual Information Retrieval Tool for Upfront Evaluation (VIRTUE), which eases and makes more effective the experimental evaluation process. Methods:...

In many scientific disciplines and industrial fields researchers and practitioners are often faced with complex problems when dealing with comparisons between two or more groups using classical parametric methods although real problems rarely agree with the stringent assumptions required by such methods. The NPC methodology (Pesarin, 2001) offers an innovative but well tested approach that free...

 The Dubai police force currently trains its accident investigators using a mixture of theoretical training and on-the-job practical training. In this paper, we investigate the suitability of a virtual environment (VE) for training and performance testing traffic accident investigators. To justify the investment for virtual training we compare trainees’ performances against the less expensive ...

Software Performance Engineering is receiving increasing attention in today’s software dominated world. Compared to research work in performance evaluation in hardware and networks, this field is still in its nascent stage. Many methods have been proposed but majority of them are unable to adapt in the software development life-cycle dominated by professionals without substantial performance en...

This article describes the development and validation of the Sport Anxiety Scale-2 (SAS-2), a multidimensional measure of cognitive and somatic trait anxiety in sport performance settings. Scale development was stimulated by fi ndings that the 3-factor structure of the original Sport Anxiety Scale (SAS; Smith, Smoll, & Schutz, 1990) could not be reproduced in child samples and that several item...

Meshes are currently used to model objects, namely human organs and other structures. However, if they have a large number of triangles, their rendering times may not be adequate to allow interactive visualization, a mostly desirable feature in some diagnosis (or, more generally, decision) scenarios, where the choice of adequate views is important. In this case, a possible solution consists in ...