Kiyoshi Aiki

A 15 -- 15 mm, 1 μA, reliable sensor-net module: enabling application-specific nodes

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. We describe architecture and technologies for developing the ZN1 module. Moreover, we demonstrate two applications that we developed simultaneously: food sanitation and home healthcare. We also show results of the ZN1 module evaluation and discuss reliability of the ZN1

Life Microscope: Continuous daily-activity recording system with tiny wireless sensor

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 sleep. Safe packet ensures lossless data acquisition with low-cost storage and efficient data compression in wireless environments with interference. In our experiment using the life microscope system, we recorded lossless activity data of 20 participants for more than 4 months.

A 15/spl times/15 mm, 1 /spl mu/A, reliable sensor-net module: enabling application-specific nodes

Radiographic apparatus includes indicium means for indelibly imprinting computerized axial tomographs with identification data which relates to the position of the tomographic slice in relation to a fixed datum position such as the top of a patients head. The indicium comprises a member having characteristically varying radiopacity which is positioned in the vicinity of the radiographic slice so as to be scanned by the exploring radiation and is fixedly secured in relation to the datum position.