Daiki Shitara

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A function alternation mechanism is proposed. It enables sensor nodes to take over the damaged functions of their neighboring sensor nodes automatically. By introducing the mechanism in a wireless sensor network (WSN), we can realize a WSN that never stops monitoring, and does not require maintenance after it is deployed, even if some sensor nodes suddenly(More)
We propose a new type of wireless sensor network system named die-hard sensor network. Conceptually, this system performs continuous monitoring without any maintenance, even if some sensor nodes die. A significant difference between our system and the ordinary wireless sensor networks is that each sensor node in our system should have an automatic(More)
In this paper, a new type of wireless sensor network system, called die-hard sensor network, is described. The system can automatically monitor a disaster-hit region by scattering many sensor nodes in the region. To realize the system, three new mechanisms have been developed. If a sensor node is unable to perform certain functions, the first(More)
We propose a distributed algorithm for function alternations, which enables sensor nodes to take over the damaged functions of their neighboring sensor nodes dynamically in a wireless sensor network. In this paper, after introducing the concept of the function alternation, the algorithm is explained in detail with some evaluation results. Comparing the(More)
We propose a distributed algorithm to realize an automatic function alternation among sensor nodes. With this algorithm, the function of a damaged sensor node is dynamically taken over by a neighboring sensor node in order to maintain the initial functionality of a wireless sensor network. Each sensor node calculates an indicator value that represents the(More)
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