When some granular material contained into a silo is pushed upwards with a piston, an irregular stick-slip motion of the system of grains is observed. We show how one can adapt the 'Scalar Arching Model' (sam) – proposed as a model for giant stress fluctuations in silos – in order to describe this stick-slip phenomenon. As a function of the sensitivity of the system to mechanical noise, the sys...

A signiicant amount of software research for developing programming environments for distributed{memory systems (DMSs) is currently underway in both aca-demia as well as industry. This paper addresses the automatic parallelization of irregular codes for DMSs. We present the language constructs provided by Vienna Fortran to deal eeciently with irregular codes. They have been implemented within t...

Irregularity is an important aspect of the cardiovascular system dynamics. Numerical indices irregularity, such as largest Lyapunov exponent and correlation dimension estimated from interbeat interval time series, are early markers diseases. However, there no consensus on origin irregularity in system. A common hypothesis suggests importance nonlinear bidirectional coupling between respiratory ...

It is essential to generate multi-resolution triangulated irregular network (TIN) models dynamically and efficiently in three-dimensional (3D) visualization, virtual reality (VR), and geographic information systems (GIS), because the data processed is multiple in scale and large in volume. This paper proposes a new approach, which extends the iterative edge collapses and vertex splits algorithm...

Geographic information systems often represent terrains, or other height elds, by triangulated irregular networks (TINs). The visualization of TINs is therefore a task any GIS has to be able to perform. This survey paper discusses two aspects of this task: the hidden-surface removal problem, which is to determine which parts of the TIN are visible from a given view point, and the computation of...