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In the context of sensor and ad hoc networks, wireless networking systems with mobile sensors have been studied enthusiastically for the applications to habitat and environment monitoring, and information communications between vehicles and portable devices. Since mobile objects move randomly and communicate each other wirelessly only on close ranges, it is possible to happen frequent disconnection...
In this paper, we propose two algorithms for broadcasting a large data set with limited loads of all nodes on a DHT-based P2P network using a de Bruijn graph. One of the broadcast algorithms is applied to de Bruijn graphs with the restricted number of nodes. We prove that this algorithm broadcasts a data set along a degree-constrained spanning tree without global knowledge of a P2P network and that...
The server mirroring method has extensively used as the technology for contents delivery networks. Several mirror servers that serve same contents are located in a network, and an access is navigated to one of the mirror servers based on the delay time and the load balance. The location of the mirror servers with high reliability against a failure and small delay times of accesses is important. In...
Open shortest path first (OSPF) is the most commonly used intra-domain Internet routing protocol. As the routes of paths are determined by basically only the link metrics, many paths may pass a link with small metric; therefore, there is high possibility that it causes the congestion of the link. It is essential that the number of the paths with large traffic in a link is limited to avoid a congestion;...
Random walk method has recently been proposed in signal integrity analysis such as power grid noise analysis. This paper proposes techniques to apply random walk method to signal noise analysis for the data path circuit containing non-linear buffers and coupling capacitors. In order to fix output voltages and currents of non-linear buffer outputs, relaxation process is employed. To analyze coupling...
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