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更新日期：2017-09-07
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SOS is the International Morse code distress signal (Wikipedia).
Designed to be quick to use, the application installed on a wearable device may prove to be useful in a lifesaving situation.
SOS distress signal consists of three short, three long, and three more short stimuli.
The proposed mechanism generates in parallel three signal sources to increase the probability of being observed.
• light - visual distress signal
• sound - audio distress signal
• vibration - sensing vibrations can be easier in some cases