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During the rush hour,the police have to go to each intersection to direct the traffic.In the rush hour , the vehicle pollution is much higher than the general.Unfortunately,they can'y wear mask when they directing traffic.When the air flow over the Windbeep,it can use principle of convection to make some noise.So the police were able to protect everyone's health and their own health.
Southern Taiwan University of Science and Technology
Kaohsiung, Taiwan
Southern Taiwan University of Science and Technology
Kaohsiung, Taiwan
Zhe-Ming,Lin
You-Hong,Ling
Yi-Zhen,Feng
Jyun-Sheng,Wu