46,884 research outputs found
Software (Re-)Engineering with PSF III: an IDE for PSF
We describe the design of an integrated development environment (IDE) for
PSF. In the software engineering process we used process algebra in the form of
PSF for the specification of the architecture of the IDE. This specification is
refined to a PSF specification of the IDE system as a ToolBus application, by
applying vertical and horizontal implementation techniques. We implemented the
various tools as specified and connected them with a ToolBus script extracted
from the system specification
Software (Re-)Engineering with PSF II: from architecture to implementation
This paper presents ongoing research on the application of PSF in the field
of software engineering and reengineering. We build a new implementation for
the simulator of the PSF Toolkit starting from the specification in PSF of the
architecture of a simple simulator and extend it with features to obtain the
architecture of a full simulator. We apply refining and constraining techniques
on the specification of the architecture to obtain a specification low enough
to build an implementation from
How instructions modify perception: An fMRI study investigating brain areas involved in attributing human agency
Behavioural studies suggest that the processing of movement stimuli is influenced by beliefs about the agency behind these actions. The current study examined how activity in social and action related brain areas differs when participants were instructed that identicalmovement stimuli were either human or computer generated.Participants viewed a series of point-light animation figures derived frommotion-capture recordings of amoving actor, while functional magnetic resonance imaging (fMRI) was used to monitor patterns of neural activity. The stimuli were scrambled to produce a range of stimulus realism categories; furthermore, before each trial participants were told that they were about to view either a recording of human movement or a computersimulated pattern of movement. Behavioural results suggested that agency instructions influenced participants' perceptions of the stimuli. The fMRI analysis indicated different functions within the paracingulate cortex: ventral paracingulate cortex was more active for human compared to computer agency instructed trials across all stimulus types, whereas dorsal paracingulate cortex was activated more highly in conflicting conditions (human instruction, lowrealismor vice versa). These findings support the hypothesis that ventral paracingulate encodes stimuli deemed to be of human origin,whereas dorsal paracingulate cortex is involvedmore in the ascertainment of human or intentional agency during the observation of ambiguous stimuli. Our results highlight the importance of prior instructions or beliefs on movement processing and the role of the paracingulate cortex in
integrating prior knowledge with bottom-up stimuli
Discovery and Selection of Certified Web Services Through Registry-Based Testing and Verification
Reliability and trust are fundamental prerequisites for the establishment of functional relationships among peers in a Collaborative Networked Organisation (CNO), especially in the context of Virtual Enterprises where economic benefits can be directly at stake. This paper presents a novel approach towards effective service discovery and selection that is no longer based on informal, ambiguous and potentially unreliable service descriptions, but on formal specifications that can be used to verify and certify the actual Web service implementations. We propose the use of Stream X-machines (SXMs) as a powerful modelling formalism for constructing the behavioural specification of a Web service, for performing verification through the generation of exhaustive test cases, and for performing validation through animation or model checking during service selection
Leisure Is Hard Work: Digital Practices and Future Competencies
Part of the Volume on Youth, Identity, and Digital Media This chapter is based on two claims, namely that digital media are fundamental in nurturing human competencies for the future and that children's leisured media practices are critical catalysts in that process. These claims are documented by results from a recent case study on children's content creation of digital animation. Based on these results, the chapter discusses some of the fundamental challenges posed to educational institutions if they are to nurture future-directed competences for all pupils. These challenges include pupils' understanding of knowledge, their attitudes to learning resources and contexts of use, and the distribution of power relations. Like 300 million other kids around the globe, every Dane under the age of 20 knows that the protagonist of The Little Mermaid is Ariel, a fiesty redhead who manages to shape her fate and fortune. This fact is noteworthy only because Danish author Hans Christian Andersen, the author of the orignal fairy tale, composed a tragic tale of loss and redemption. The narrative and experiential discrepancies raise fundamental questions about the ways in which global and local media products frame children's everyday culture and the ways in which media operate as identity markers in a variety of sociocultural contexts. Moreover, Disney's figures, like many other media elements, are routinely appropriated by children in their own, increasingly digitized, media productions, from simple drawings to blogs, screen dumps, and home pages. These practices raise important issues about the role played by digital forms of media production for children vis a vis the more conventional and widespread forms of media reception
A survey of partial differential equations in geometric design
YesComputer aided geometric design is an area
where the improvement of surface generation techniques
is an everlasting demand since faster and more accurate
geometric models are required. Traditional methods
for generating surfaces were initially mainly based
upon interpolation algorithms. Recently, partial differential
equations (PDE) were introduced as a valuable
tool for geometric modelling since they offer a number
of features from which these areas can benefit. This work
summarises the uses given to PDE surfaces as a surface
generation technique togethe
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