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Aiming at finding the $k$ nodes with the highest readings among sensor nodes, top- $k$ query is a very important and useful query in wireless sensor networks (WSNs). Current studies about top- $k$ query in WSNs mainly focus on always-on WSNs (A-WSNs) where sensors always stay awake and little research pays attention to top- $k$ query in duty-cycled WSNs (D-WSNs) in which sensors are dynamically...
In recent years, there has been an increasing interest in P2P (Peer-to-Peer) streaming environments. There are various types of streaming contents. One of them is a content that can be separated into model and motion data like CG animations. The interruption times that occur during playing the data can be reduced by considering the time to start playing each type of data. However, previous researches...
In this paper, we propose an energy-efficient data gathering method, which is an extension of our previous method, to further reduce traffic in wireless sensor networks. Our previous method suppresses the energy consumption by traffic reduction utilizing spatial and temporal interpolation. In the extended method, each node appropriately utilizes either of spatial or temporal interpolation according...
In recent years, there has been an increasing interest in P2P (Peer-to-Peer) streaming environments. In P2P streaming environments, compared with the traditional server-client model, the load of the server can be reduced by transmitting the divided streaming data (pieces) among clients. However, when bandwidths between clients are narrow, interruption occurs since clients cannot receive the necessary...
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