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we design a public system to offer people to seek help when they are in danger in the alley. Only do you hold ID card, you can use the system. The machines set at the starting point and terminal point of alleys. When people need to go through a lane or alley, you can take out a device when you are swiping ID card atstarting point. If you arrived the terminal point safely, you can return the device to machines. If you happened to emergency, you could press the button at the middle of the device. The machine received a signal, it would bright light and sing a loud sound to attract passby’s attention.
Ningbo Institute of Technology
Ningbo Institute of Technology, Zhejiang University
Shengqi Lai Yuan Chen Hui Fang Jiajun Pan