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In this paper, a ZigBee-based sensor network is realized and evaluations are carried out in order to clarify the fundamental performance of this sensor network. Life recording and management system is introduced as an example of ZigBee-based sensor networks, and the system is introduced into mobile WiMAX network in Azumino city in order to solve some medical problems in local cities. The following...
A continuous daily-activity recording system called ldquolife microscoperdquo is developed. Acceleration waveform data is acquired without any data loss for a week with a 150-mAh battery. This is made possible by two novel techniques: ldquocool senserdquo and ldquosafe packetrdquo. Cool sense reduces power by 98% during continuous sensing at frequencies such as 20 Hz by using a millisecond time-scale...
An ultra-small, low-power sensor-net module called ZN1 is developed. ZN1 integrates MCU, ZigBee RF into an ultra-small 15times15-mm module with an ultra-low standby current less than 1 muA. The and highly reliable operation for more than 15 years of the ZN1 enable low-cost practical application-specific sensor nodes for HVAC, structure monitoring, office management, security, medicine, and healthcare...
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