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With the introduction of trust mechanism into the wireless ad hoc network, security can be greatly improved, because trust information is shared among all nodes in the network. However, such a mechanism also has the potential vulnerability if the so-called 'big-mouth' nodes broadcast wrong trust information. Some measures have to be taken to filter the received trust information before it is fed to...
The ad hoc sensor network has been widely applied to various applications, such as environmental data collection and surveillance. To enable these applications, the accurate localization of sensor nodes is crucial. The DV-Hop [1] provides a basic scheme to retrieve the localization information without GPS. The DV-Hop scheme requires the anchor nodes to be localized in advance, and the locations of...
Most monitoring or tracking applications require the localization information in wireless sensor network. The DV-Hop provides a basic scheme to retrieve the localization without GPS information. DV-Hop scheme only uses the localizations of the reference nodes and the hop-count, so the fundamental estimation may cause the larger error than range-based schemes. The proposed scheme uses the neighbor...
From the channel assignment schemes in time division multiple access (TDMA) slot assignment protocols developed in previous studies, we have found that these protocols do not have a convenient frame length shrink scheme after the expansion of the frame length. As the network size grows, the frame length expands quickly, particularly when we set the frame length as a power of two. A very long frame...
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