Self-Adaptive Component-Based Transaction Commit Management

For years, transactional protocols have been defined for particular application needs. Traditionally, when implementing a transaction service, a protocol is chosen and it remains the same during the system execution. Nevertheless, the dynamic nature of nowadays application contexts (e.g., mobile, ad-hoc, peer-to-peer) and behaviour variations (semantic-related aspects) motivates the needs for application adaptation. Next generation of system applications should be adaptive or even better self-adaptive. This paper proposes (1) a component-based architecture of standard 2PC-based protocols and (2) a self-Adaptive Component-based cOmmit Management, named ACOM. Self-a\-dap\-tation is obtained by behaviour awareness and com\-po\-nent-based reconfiguration. This allows ACOM to select the most appropriate protocol according to the context. We show that using ACOM performs better than using only one commit protocol in a variable system and that the reconfiguration cost can be negligible

An investigation of smartphone applications: Exploring usability aspects related to wireless personal area networks, context-awareness, and remote information access

This thesis was submitted for the degree of Doctor of Philosophy and awarded by Brunel University.In this thesis we look into usability in the context of smartphone applications. We selected three research areas to investigate, namely Wireless Personal Area Networks, Context-awareness, and Remote Information Access. These areas are investigated through a series of experiments, which focuses on important aspects of usability within software applications. Additionally, we mainly use smartphone devices in the experiments. In experiment 1, Multi-Platform Bluetooth Remote Control, we investigated Wireless Personal Area Networks. Specifically, we implemented a system consisting of two clients, which were created for Java ME and Windows Mobile, and integrated with a server application installed on a Bluetooth-enabled laptop. For experiments 2 and 3, Context-aware Meeting Room and PainDroid: an Android Application for Pain Management, we looked closely at the research area of Contextawareness. The Context-aware Meeting Room was created to automatically send meeting participants useful meeting notes during presentations. In experiment 3, we investigated the use of on-device sensors for the Android platform, providing an additional input mechanism for a pain management application, where the accelerometer and magnetometer were used. Finally, the last research area we investigated was Remote Information Access, where we conducted experiment 4, Customised Android Home Screen. We created a system that integrated both a cloud-based server application and a mobile client running on the Android platform. We used the cloud-computing platform to provide context management features, such as the ability to store the user configuration that was automatically pushed to the mobile devices

An investigation of smartphone applications : exploring usability aspects related to wireless personal area networks, context-awareness, and remote information access

In this thesis we look into usability in the context of smartphone applications. We selected three research areas to investigate, namely Wireless Personal Area Networks, Context-awareness, and Remote Information Access. These areas are investigated through a series of experiments, which focuses on important aspects of usability within software applications. Additionally, we mainly use smartphone devices in the experiments. In experiment 1, Multi-Platform Bluetooth Remote Control, we investigated Wireless Personal Area Networks. Specifically, we implemented a system consisting of two clients, which were created for Java ME and Windows Mobile, and integrated with a server application installed on a Bluetooth-enabled laptop. For experiments 2 and 3, Context-aware Meeting Room and PainDroid: an Android Application for Pain Management, we looked closely at the research area of Contextawareness. The Context-aware Meeting Room was created to automatically send meeting participants useful meeting notes during presentations. In experiment 3, we investigated the use of on-device sensors for the Android platform, providing an additional input mechanism for a pain management application, where the accelerometer and magnetometer were used. Finally, the last research area we investigated was Remote Information Access, where we conducted experiment 4, Customised Android Home Screen. We created a system that integrated both a cloud-based server application and a mobile client running on the Android platform. We used the cloud-computing platform to provide context management features, such as the ability to store the user configuration that was automatically pushed to the mobile devices.EThOS - Electronic Theses Online ServiceGBUnited Kingdo

An investigation of smartphone applications : exploring usability aspects related to wireless personal area networks, context-awareness, and remote information access

In this thesis we look into usability in the context of smartphone applications. We selected three research areas to investigate, namely Wireless Personal Area Networks, Context-awareness, and Remote Information Access. These areas are investigated through a series of experiments, which focuses on important aspects of usability within software applications. Additionally, we mainly use smartphone devices in the experiments. In experiment 1, Multi-Platform Bluetooth Remote Control, we investigated Wireless Personal Area Networks. Specifically, we implemented a system consisting of two clients, which were created for Java ME and Windows Mobile, and integrated with a server application installed on a Bluetooth-enabled laptop. For experiments 2 and 3, Context-aware Meeting Room and PainDroid: an Android Application for Pain Management, we looked closely at the research area of Contextawareness. The Context-aware Meeting Room was created to automatically send meeting participants useful meeting notes during presentations. In experiment 3, we investigated the use of on-device sensors for the Android platform, providing an additional input mechanism for a pain management application, where the accelerometer and magnetometer were used. Finally, the last research area we investigated was Remote Information Access, where we conducted experiment 4, Customised Android Home Screen. We created a system that integrated both a cloud-based server application and a mobile client running on the Android platform. We used the cloud-computing platform to provide context management features, such as the ability to store the user configuration that was automatically pushed to the mobile devices.EThOS - Electronic Theses Online ServiceGBUnited Kingdo

Adaptabilité et reconfiguration des systèmes temps-réel embarqués

Les systèmes temps réel peuvent être grands, distribués et avoir un environnement dynamique. Cela exige la mise en place de différents modes de fonctionnement et techniques de fiabilité. Par ailleurs, ces différents changements dynamiques d'architecture et de comportement ont un impact sur les caractéristiques temporelles des systèmes qui nécessitent une étude particulière de la capacité des comportements d'adaptation à garantir les contraintes fixées aux systèmes. Le travail présenté dans cette thèse est focalisé sur la spécification de l'adaptabilité d'un système temps réel et l'étude sur de jeux de configurations prédéfinis de l'impact temporel des actions d'adaptation dynamique. Pour cela, nous présentons une méthodologie outillée basée sur la notion de Mode du profil MARTE. Chaque mode représente un comportement possible du système pour un environnement bien déterminé associé à une configuration logicielle. L'approche développée propose de modéliser le comportement adaptatif à travers la définition du contexte, de la variabilité, des opérations de reconfigurations et de la configuration de base. L'analyse d'ordonnançabilité est ensuite effectuée au niveau du modèle en intégrant l'impact des comportements d'adaptation. Deux paradigmes de modélisation peuvent alors être exploités pour effectuer cette analyse : les requêtes et les flots de données. Cela permet de vérifier que les contraintes temporelles de notre système resteront satisfaites en intégrant les opérations de reconfiguration issues du comportement adaptatif. Enfin, l'approche permet de générer des implantations des comportements adaptatifs à partir des modèles afin d'automatiser l'intégration des mécanismes d'adaptation dans les systèmes temps réel.Real-time systems can be large, distributed and have a dynamic environment. This requires the introduction of various operating modes and reliability techniques. Different operating modes are associated with a different architecture and behavior. Dynamic changes between these modes have an impact on the temporal characteristics of systems which requires an analysis whether the constraints of the system are also fulfilled during adaptations. The work presented in this thesis is focused on specifying the adaptability and the study of the temporal impact of dynamic adaptation actions on a predefined set of configurations. For this purpose, we present a tooled methodology based on the concept of Mode of the MARTE profile. Each mode represents a possible behavior of the system for a well determined environment associated with a software configuration. The influence of these operations on the temporal behavior of the system is done via schedulability analysis. This methodology proposes to model the adaptive behavior through the definition of the context, the variability, the reconfiguration operations and of the base configuration. The schedulability analysis is performed at the model level by incorporating the impact of the behavior of adaptation. Two paradigms of modeling can be exploited to perform this analysis: request/reply and data flow. This allows to verify that the temporal constraints of our system will remain satisfied even with the inclusion of reconfiguration operations executing the adaptive behavior. Finally, the approach allows generating the implementation of adaptive behavior from the model to automate the integration of adaptation mechanisms in real-time systems.PARIS11-SCD-Bib. électronique (914719901) / SudocSudocFranceF