Si près, si loin du politique

Extensions du diagramme d'activité pour contrôler l'accès au SI

The evolution of organisations and their information systems towards more openness raises the challenge of their security. The definition of an access control policy is a major activity in the design of an Information System. This paper proposes an approach for the specification of security policies, based on the RBAC model, at the workflow level. This approach propagates permissions defined on...

Modèlisation graphique des SI. Du traitement visuel de modèles complexes

The problem of the management of the systems’ complexity is followed today by the problem of the increasing complexity of models. Despite recent significant advances in the design of models, it is clear that current solutions remain inoperative in the case of complex models, both heterogeneous and with multi business dimensions. After a state of the art of the various properties of complex syst...

Vers une aide à la spécification d’une politique d’échange d’information dans un SI

Today, with the intensification of information exchange, it becomes crucial to provide, in information systems, rules for the dissemination of information between partners, ie an information exchange policy. The aim of this approach is to have, from the design phase, a tool that helps the user to define the policy. We therefore propose to use constraint solvers to analyze generic properties of ...

Zwitterionic Si-C-Si-P and Si-P-Si-P four-membered rings with two-coordinate phosphorus atoms.

مشخصه‌یابی ‌ساختارهای دورآلائیده وارون p-Si/SiGe/Si با روشهای پرتو X و الکتریکی

In this work, the epitaxially grown, lattice–matched p-Si/Si1-xGex/Si inverted remote doped structures have been characterized using X-ray and electrical techniques. The Si cup layer thickness () and Ge content (x) have been determined from computer simulation of intensity and angular sepration of (004) peaks observed in the X-ray diffraction pattern due to misorientaion of corresponding Bragg ...