Abstract
The situation that most middle-aged people are not able to take care of their parents or children during working days leads to the high rate of in-door accidents threatening those with low self-care ability. Online and field investigations showed that the solution to develop a system with functions to warn users when an emergency occurs is highly supported by the working class. For further experiment and application, one prototype of indoor security system, with various sensors and text-message warning modules, was accomplished and trailed in several in-home experiments, and was proved to be practical and promising.
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