The emergence of inexpensive and low-power wireless communication hardware and various handheld, wearable, and embedded computing technologies is making computing and communication devices more mobile and ubiquitous. Due to the mobility and high-density of networkenabled devices, short range mobile ad hoc networks (MANET) are instantaneously and autonomously formed to facilitate exchange of information. In MANET, interactions among the devices are driven by constantly changing contextual and environmental conditions, rather than by the applications resident on the devices. This trend makes Autonomous Decentralized Systems (ADS) a desirable architecture for facilitating ad hoc communication among mobile devices. In this paper, Reconfigurable ContextSensitive Middleware (RCSM) is presented to facilitate ADS applications in MANET.

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Context-awareness is increasingly becoming an important capability in devices for ubiquitous computing environments. These devices use on-board sensors and history of user interaction to collect data that are used to adapt their behavior to suit with the current environment. There is a need to support realtime software in ubiquitous computing environments, especially in reactive systems, such as distributed and mobile sensors, location-based information services, etc. In these cases, both behavior and the interaction among devices depend on constantly changing environmental conditions, in addition to explicit user control. This characteristic requires specific system services to support the development and the runtime operation of real-time context-aware software. This implies that the underlying services must themselves be context-semi tive. In this paper, Reconfigurable Context-Sensi tive Middleware (RCSM) is presented to facilitate real-time context-aware software in ubiquitous computing environments.

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