| Publications of year 2006 |
| Books and proceedings |
| Thesis |
| Articles in journal, book chapters |
| Conference articles |
| Nowadays, application developers have to deal with increasingly variable execution contexts, requiring the creation of applications able to adapt themselves autonomously to the evolutions of this context. In this paper, we show how an aspect-oriented approach enables the development of self-adaptive applications where the adaptation code is well modularized, both spatially and temporally. Concretely, we propose SAFRAN, an extension of the Fractal component model for the development of the adaptation aspect as reactive adaptation policies. These policies detect the evolutions of the execution context and adapt the base program by reconfiguring it. This way, SAFRAN allows the development of the adaptation aspect in a modular way and its dynamic weaving into applications. |
| La puissance de calcul des syst\`emes mobiles rend possible l'exploitation d'application multim\'edia. C'est souvent au d\'etriment de l'autonomie. Le cas des bornes multim\'edia est particuli\`erement int\'eressant car elles traitent des flux de fa\c{c}on continue, l'historique de traitement ainsi obtenu peut {\~A}ªtre utilis\'e pour alimenter un algorithme de d\'ecision de gestion de l'\'energie du syst\`eme et augmenter l'autonomie. Cette approche permet de maximiser l'utilisation de la ressource \'energ\'etique fournie par des panneaux solairee ou des batteries. |
| Video kiosks increasingly contain powerful PC-like embedded processors, allowing them to display video at a high level of quality. Such video display, however, entails significant energy consumption. This paper presents an approach to reducing energy consumption by adapting the CPU clock frequency. In contrast to previous approaches, we exploit the specific behavior of a video kiosk. Because a kiosk plays the same set of movies over and over, we choose a CPU frequency for a given frame based on the computational requirements of the frame that were observed on earlier iterations. We have implemented our approach in the legacy video player MPlayer. On a PC like those that can be found in kiosks, we observe increases in battery lifetime of up to 2 times as compared to running at the maximum CPU frequency on a set of high resolution divx movies. |
| Internal reports |
| Distribution-related concerns, such as data replication, often crosscut the business code of a distributed application. Currently such crosscutting concerns are frequently realized on top of distributed frameworks, such as EJBs, and initial AO support for the modularization of such crosscutting concerns, \eg JBoss AOP and Spring AOP, has been proposed. Based on an investigation of the implementation of replicated caches using JBoss Cache, we motivate that crosscutting concerns of distributed applications benefit from an aspect language for explicit distributed programming. We propose \dhamaca, a new aspect language with explicit distributed programming mechanisms, which provides three contributions. First, remote pointcut constructors which are more general than those of previous related approaches, in particular, supporting remote sequences. Second, a notion of distributed advice with support for asynchronous and synchronous execution. Third, a notion of distributed aspects including models for the deployment, instantiation and state sharing of aspects. We show several concrete examples how \dhamaca can be used to modularly implement and extend replicated cache implementations. Finally, we present a prototype implementation of \dhamaca, which we have realized by extending JAsCo, a system providing dynamic aspects for Java. |
| Miscellaneous |
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