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===== UbiNet Students Project :  Reactive Adaptation in Middleware for Ubiquitous Computing =====

===== Who? =====

  * Name : **Jean-Yves Tigli,** and  **Stéphane Lavirotte** 
  * Mail: tigli@polytech.unice.fr, lavirott@unice.fr
  * Telephone: +33684245567
  * Web page: www.tigli.fr, www.lavirotte.com

===== Where? =====

  * Place of the project: I3S Laboratory, Site des Templier, 930, Route des Colles - BP 145, 06903 Sophia Antipolis Cedex
  * Address: 930 route des Colles, 06903 Sophia Antipolis cedex
  * Team: Rainbow
  * Web page: rainbow.i3s.unice.fr


===== What? =====

==== Title: Reactive Adaptation in Middleware for Ubiquitous Computing : Survey, characterization and  analysis. ====


  * Number of students: 1-2
  * Pre-requisites if needed:  good skills in software programming, distributed computing and classical middlewares.

==== Description: ====

Ubiquitous Computing, introduced by Mark Weiser in 1991, raised many challenges across computer science: in systems design and engineering, in systems modeling, and in user interface design. Initially the effective integration and interaction with the physical world sufficed to promote ubiquitous computing interest due to significantly increased real world visibility as well as real world control, towards ambient intelligence. But these first ubiquitous systems were often proofs of concept with a single static configuration with a priori known devices. Today mobility of users and an increasing heterogeneity of devices introduce a new significant challenge for Middleware for ubiquitous computing. We witness to a kind of inversion in the classical software methodology where the software applications levels are much more stable and stationary than the software infrastructure level. The operational environment is then tightly connected with the real world but is also partly unknown at design time and is always changing at runtime in uncountable manner.

In order to to adress ubiquitous services continuity (Cf. French national research project CONTINUUM, http://continuum.unice.fr) in spite of such constraints, recent researches are moving towards an era of emergent middleware that is middleware that emerges at run-time to match the current operational environment and application requirements.

The research group Rainbow focus on adaptive service oriented middleware for ubiquitous computing (Cf. main recent publications). Contrary to most of the researches in this domain, Rainbow studies, proposes and validates contributions for a reactive adaptation, i.e. when the time for adaptation remain compatible with the continuous evolution of the ubiquitous environment.

Its main contribution bases on the theory of the aspects of assembly (AA) to adapt reactively, semantically and independently assemblies of  components in Service Component Architecture (SCA) for example.
After a short survey on reactivity in adaptive middlewares, the students of this project will study various algorithms in the different steps (Pointcut Matching and Weaving Mecanism) of the AA application process. They will specifically study the algorithmic costs of each of these steps  and will propose a formal performance model that will allow to compare different policies in the application of AA.

To illustrate these results, some algorithms will  be able to be tested in real experiments on the CONTINUUM platform, in collaboration with the research engineer of the project.

==== References : ====
J.-Y. Tigli, S. Lavirotte, G. Rey, V. Hourdin, M. Riveill, “Lightweight Service Oriented Architecture for Pervasive Computing” IJCSI International Journal of Computer Science Issues, Vol. 4, No. 1, September 2009, ISSN (Online): 1694-0784, ISSN (Print): 1694-0814

J.-Y. Tigli, S. Lavirotte, G. Rey, V. Hourdin, M. Riveill, “Context-aware Authorization in Highly Dynamic Environments” IJCSI International Journal of Computer Science Issues, Vol. 4, No. 1,
September 2009, ISSN (Online): 1694-0784, ISSN (Print): 1694-0814

J.-Y. Tigli, S. Lavirotte, G. Rey, V. Hourdin, D. Cheung, E. Callegari, M. Riveill “WComp middleware for ubiquitous computing: Aspects and composite event-based Web services” dans la revue Annals of Telecommunications, éditeur Springer Paris, ISSN 0003-4347 (Print)
1958-9395 (Online), Vol. 64, No 3-4, March-April 2009

==== Useful Information: ====
A stage can follow the project period.