This paper is concerned with performance analysis of the MIN (Multistage Interconnection Network) with virtual channel flow control under bursty traffic. In the past, many research efforts have been devoted to the performance analysis of buffered MIN switches. Most of these analyses, however, assume that a burst of cells is indivisible when transferred across stages of a MIN switch, or that the...

The process of styling virtual hair is a tedious task for 3D artists, who would significantly profit from more natural and intuitive ways of creating virtual hairstyles such as, for example, the possibility to simply comb virtual hair using a haptic device. However, despite significant advances in hair simulation during the last decades, physically based haptic interaction with hair is still an...

Virtual reality offers a new frontier for human interaction with simulation models. A virtual environment, such as that created with a CAVE, imposes either real-time or quasi-real-time performance on the simulation model. Beyond that general requirement, what others can be identified for simulation programs that drive a virtual reality or virtual environment interface? Based on experience with ...

Although organizational scholars have begun to study virtual work, they have yet to fully grapple with its diversity. We draw on semiotics to distinguish among three types of virtual work (virtual teams, remote control, and simulations) based on what it is that a technology makes virtual and whether work is done with or on, through, or within representations. Of the three types, simulations hav...

Virtual assembly simulation is one of the most challenging applications of virtual reality. Robust and natural interaction techniques to perform the assembly tasks under investigation are essential as well as efficient methods for choosing from a large number of functionalities from inside the virtual environment. In this paper we present such techniques and methods, in particular multimodal in...

We have proposed novel 3D virtual simulation software for breast plastic surgery. Our software comprises two processes: a 3D torso modeling and a virtual simulation of the surgery result. First, image-based modeling is performed in order to obtain a female subject’s 3D torso data. Our image-based modeling method utilizes a template model, and this is deformed according to the patient’s photogra...

Interactive Virtual Training (IVT) is a web-based interactive simulation system created to help early career teachers working in high-poverty schools learn effective classroom management skills. IVT simulates disruptive students’ behavior (aggressive, off-task, noncompliant), as defined in vignettes developed by pedagogical experts on our team. These simulations enable early career teachers to ...

This study lies in the context of cognitive ergonomy and virtual engineering. We propose to model and implement the behaviour of autonomous virtual agents, using ideas from psychology (fuzzy cognitive maps, affordances) and neurophysiology (active perception). We describe the basis for a behavioral model imitating human beings’ perceptive operation. The psychological notion of “affordance” will...