Two robust nonlinear controllers along with a nonlinear observer have been developed in this study to control a 1D nonlinear flexible spacecraft. The first controller is based on dynamic inversion, while the second one is composed of dynamic inversion and µ-synthesis controllers. The extension of dynamic inversion approach to flexible spacecraft is impeded by the non-minimum phase characteristi...

Current approaches to programming cause external information to be encoded into components. When this information is not of importance to the implementation of these components, but is an arti-fact of programming mechanisms, system structure suuers, resulting in greater diiculties in software evolution and reuse. We are investigating an approach to lessen the eeects of such extraneous embedded ...

The present work deals with dynamic vehicle routing problems in which new customers appear during the design or execution of the routing. We propose a parallel Adaptive Large Neighborhood Search (pALNS) that produces high quality routes in a limited computational time. Then, we introduce the notion of driver inconvenience and deVne a bi-objective optimization problem that minimizes the cost of ...

Intelligent agents are powerful tools for complex and dynamic problems. Belief Desire Intension (BDI) is one of the most popular agent architectures for reactive goal directed agents. Planning is intrinsic for intelligent behaviour. But planning from first principle is costly in terms of computation time and resources. BDI agents retain their reactive property by avoiding planning from real-tim...

This paper presents the design and implementa tion of dynamic distributed data structures to sup port parallel adaptive multigrid nite di erence codes based on hierarchical adaptive mesh re nement AMR techniques for the solution of partial di eren tial equations The abstraction provided by the data structures is a dynamic hierarchical grid where oper ations on the grid are independent of its di...

One of the objectives of the DRAMA project it to develop a public domain library for parallel mesh re-partitioning. In this library, three families of re-partitioning techniques will be included, based on (a) graph partitioning, (b) direct element mesh migration and (c) coordinate partitioning. Section 1 of this report gives a brief overview of the various mesh re-partitioning algorithms. Secti...