Yasuharu Sakai

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Multicast routing problem is one of the essential problems for supporting multicast and broadcast communication services which are the most important services of the highspeed information networks. In packet type networks, a packet for multicast communication should be made its copies at each intermediate branching node and transmitted to the subsequent(More)
One of the most challenging issues in wireless sensor networks is extension of the overall network lifetime. Data aggregation is one promising solution because it reduces the amount of network traffic by eliminating redundant data. In order to aggregate data, each sensor node must temporarily store received data, which requires a specific amount of memory.(More)
This paper presents an ultra-low-power single-chip sensor-node VLSI for wireless-sensor-network applications. A communication centric design approach has been introduced to reduce the power consumption of the RF circuits and the entire sensor network system, through a vertical cooperative design among circuits, architecture, and communication protocols. The(More)
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