Abstract
The efficiency of scheduling algorithms is essential in order to attain optimal performances from parallel programming systems. In this paper we use a portable parallel programming environment we have implemented, the pSystem, to evaluate and compare the performance of various scheduling algorithms on shared memory parallel machines. © Springer-Verlag Berlin Heidelberg 1994.

Abstract

Abstract

Abstract
We show that optical shock-wave solutions are possible in nonlinear dispersive amplifying media that exhibit a frequency-dependent gain and background loss. These shock-wave domains exist at lasing threshold and are permitted in both the normal and the anomalous dispersive regions.

Abstract
By means of an exact solution, we demonstrate that a Gaussian beam can undergo spatial compression when it traverses a photorefractive medium. This is possible provided that the external bias field exceeds the critical value necessary to establish photorefractive spatial solitons. In this regime and under paraxial assumptions our analysis indicates that a Gaussian beam tends to exhibit self-focusing collapse. Beam self-deflection effects that arise from the pi/2-phase-shifted component of the photorefractive grating are also considered in our study.

Abstract
Cooperative environments to support Software Development (CSD) have as main goal to enable several users connected over network to work together in order to develop software. They have to solve problems such as: coherence maintenance of the software project through the distributed system by managing possible conflicts between local versions of each group member and promote the necessary mechanisms for the inter-group awareness and integrity. We introduce in this paper a distributed solution to support CSD by describing our own prototype: a Computer-Supported Cooperative Work (CSCW) architecture for software development. It enables a group of developers (2 to 4), possibly located at remote places and connected over network, to develop software together. A cooperative multimedia editing environment is available during the development cycle, enclosing mechanisms of computer-conferencing (text, audio and video communications).