A grid shape is a set of boxes chosen from a square grid; any Young diagram is an example. This paper considers a notion of pattern-avoidance for 0-1 fillings of grid shapes, which generalizes permutation pattern-avoidance. A filling avoids some patterns if none of its sub-shapes equal any of the patterns. We focus on patterns that are pairs of 2 × 2 fillings. For some shapes, fillings that avo...

This paper demonstrates that multi-agent systems have the capacity to model a region in all its complexity. An example is developed to show that these tools are not only capable of spatializing and distributing the behaviour of individuals, but above all, that they allow individuals to integrate different perceptions of space as well as the constraints imposed on them by a community. A dialecti...

L’introduction des jeux-vidéo sérieux comme soutiens pédagogiques dans le domaine de l’enseignement est un processus de plus en plus démocratisé. En parallèle de cette introduction, la recherche en ”game studies” représente une discipline académique très active qui s’intéresse à l’analyse des systèmes vidéoludiques complexes, notamment en ce qui concerne la compréhension de l’expérience des jou...

In ebXML the choreography of a business process should be modeled by UMM (UN/CEFACT Modeling Methodology) and is finally expressed in BPSS (Business Process Specification Schema). Our analysis of UMM and BPSS by workflow patterns shows that their expression power is not always equivalent. We use the workflow patterns to specify the transformation from UMM to BPSS where possible. Furthermore, th...

land use optimization using linear programing is a method in watershed management for access to production sustainability and decreasing of soil erosion. the sensitivity analysis of the model can with investigation of results influence form changes in input parameters, lead to decrease the uncertainty in decision-making of management programs. so in this research, linear programming model using...

We show that for a given planar convex set K of positive area there exist three pairwise internally disjoint convex sets whose union is K such that they have equal area and equal perimeter. © 2009 Elsevier Inc. All rights reserved.

This paper presents the simulation of new shootthrough control methods for double stage quasi based Dc/Dc converters with high frequency stepup isolation transformer using matlab Simulink. The major goal is increase efficiency and also increase the stage of Quasi. The new shootthrough technique is used for inversion purpose this reduces the un equal switching frequencies of transistor in double...

Varioussoftware for Geographical Information Systems (GISs) have been developed and used in many different engineering projects. In GIS applications, map coverage is important in terms of performing reliable and meaningful queries. Map projections can be conformal, equal-area and equidistant. The goal of an application plays an important role in choosing one of those projections. Choosing the e...