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The umbrella has different uses, it can be used for blocking the sun, which needs to block totally. However, it needs to be saw-through when blocking the rain for safety issue. It can be more safety in the dark if the fabric of umbrella can be glowing.
The special fabric on the umbrella can change color or its opacity depended on the weather changing. It can be more safety and clear by using this new creation no matter it is sunny or raining day.
National Taipei University of Technology,
Taipei City, Taiwan
Hao Kuang-Chung Lai Tsung-Ping