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(2007)Book ChapterThe possible variability of project delay is useful information to understand and mitigate the project delay risk. However, it is not sufficiently considered in the literature concerning effort estimation and simulation in software product line development. In this paper, we propose a project delay simulation model by introducing a random variable to represent the variability of adaptive rework. The model has been validated through stochastic simulations by comparing generated adaptive rework to an actual change effort distribution, and by sensitivity analysis. The result shows that the proposed model is capable of producing reasonable variability of adaptive rework, and consequently, variability of project delay. Analysis of our model indicates that the strength of dependency has a larger impact than the number of residual defects, for the studied simulation settings. However, high levels of adaptive rework variability did not have great impact on overall project delay.
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(2007)Book ChapterIn many modern enterprises, explicit business process definitions facilitate the pursuit of business goals in such ways as best practice reuse, process analysis, process efficiency improvement, and automation. Most real-world business processes are large and complex. Successfully capturing, analysing, and automating these processes requires process definition languages that capture a variety of process aspects with a wealth of details. Most current process modeling languages, such as Business Process Modeling Notation (BPMN), focus on structural control flows among activities while providing inadequate support for other process definition needs. In this paper, we first illustrate these inadequacies through our experiences with a collection of real-world reference business processes from the Australian lending industry. We observe that the most significant inadequacies include lack of resource management, exception handling, process variation, and data flow integration. These identified shortcomings led us to consider the Little-JIL language as a vehicle for defining business processes. Little-JIL addresses the afore-mentioned inadequacies with a number of innovative features. Our investigation concludes that these innovative features are effective in addressing a number of key reference business process definition needs.
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(2006)Book ChapterThis paper describes a subjective experiment in progress to study human sound localization using mobile audio augmented reality systems. The experiment also serves to validate a new methodology for studying sound localization where the subject is outdoors and freely mobile, experiencing virtual sound objects corresponding to real visual objects. Subjects indicate the perceived location of a static virtual sound source presented on headphones, by walking to a position where the auditory image coincides with a real visual object. This novel response method accounts for multimodal perception and interaction via self-motion, both ignored by traditional sound localization experiments performed indoors with a seated subject, using minimal visual stimuli. Results for six subjects give a mean localization error of approximately thirteen degrees; significantly lower error for discrete binaural rendering than for ambisonic rendering, and insignificant variation to filter lengths of 64, 128 and 200 samples.
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(2008)Book ChapterReactive transport models were developed to explore the evolution in groundwater chemistry along the ow path in three aquifers; the Triassic East Midlands aquifer (UK), the Miocene aquifer at Valréas (France) and the Cretaceous aquifer near Aveiro (Portugal). All three aquifers contain very old groundwaters and variations in water chemistry that are caused by large-scale geochemical processes taking place at the timescale of thousands of years. The most important geochemical processes are ion exchange (Valreas and Aveiro) where freshwater solutes are displacing marine ions from the sediment surface, and carbonate dissolution (East Midlands, Valréas and Aveiro). Reactive transport models, employing the modelling code PHREEQC (Parkhurst and Appelo 1999; Appelo and Postma 2005), which included these geochemical processes and one-dimensional solute transport were able to reproduce the observed patterns in water quality. These models may provide a quantitative understanding of the evolution in natural baseline properties in groundwater.
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