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With the great progress of the Information Technologies, micro-processors are embedded into everywhere to make our daily life convenient, efficient and comfortable. However, how to integrate distributed resources existing among heterogeneous devices to build pervasive applications that can constantly adapt to the highly dynamic computing environment is still a challenge. On our previous work, by analyzing...
We consider an optimization problem in wireless sensor networks (WSNs) that is to find a multicast tree with maximum lifetime. While a recently proposed distributed algorithm for this problem guarantees to obtain optimal solutions, its high message complexity may prevent such contribution from being practically used in resource-constrained WSNs. In this paper, we proposed a new distributed algorithm...
Ubiquitous computing is a user-centric distributed computing paradigm, allowing users to access to their preferred services even while moving around. To make such a vision a reality, context-aware workflow management is one of key issues because the context of ubiquitous applications is highly varying. In this paper, we propose a context model for intelligent campus navigation applications, then present...
WANET (wireless ad-hoc network) is expected to be deployed in a wide range of civil and military applications. The communicating nodes in these networks might be distributed randomly and are assumed to have packet-forwarding capability in order to communicate with each other over a shared and limited radio channel. Building such networks usually poses a significant technical challenge because energy...
With the great progress of technologies, computers are embedded into everywhere to make our daily life convenient, efficient and comfortable. Ubiquitous society became so real for us with this fast development. However, how to integrate distributed resources existed among heterogeneous devices to build pervasive applications that can constantly adapt to the highly dynamic computing environment is...
With the great progress of technologies, computers are embedded into everywhere to make our daily life convenient, efficient and comfortable. Further more, most of them are small, powerful, intelligent and invisible. In a ubiquitous computing environment, support methods for learning are more effective than some traditional ways, such as WBT (Web-based training) and e-learning. In this paper, we proposed...
Energy efficiency for target tracking in wireless sensor networks is very important and can be improved by reducing the number of nodes involved in communications. We propose two algorithms, RARE-area and RARE-node to reduce the number of nodes participating in tracking and so increase energy efficiency. The RARE-area algorithm ensures that only nodes that receive a given quality of data participate...
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