Chikano, M., Tomiyasu, F., Awai, S., Koyama, Y., & Konno, T. (2020, October). 

In the super-aged society, the number of elderly people who go missing due to dementia is increasing year by year. The police and local governments are speeding up efforts for early detection of the missing people, because cases of late detection and death are increasing. There are systems to collect location information by having elderly people carry smartphones, etc., but they don’t always carry these devices with them.

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