Articles
7 articles in total
How I Used Dynamic Programming to Optimize Classroom Ventilation
My classroom got stuffy every winter afternoon. I modeled how CO₂ and temperature change in a closed room, then used dynamic programming to find when to open the windows.
How I Built a Fall Detection App with Kotlin
My grandfather fell at home and could not reach his phone. Apple Watch has fall detection, but most people cannot afford one. So I built an app that uses a phone's accelerometer to detect falls and send alerts.
How I Made Sunscreen from Green Tea
Traditional sunscreens can harm coral reefs and irritate skin. I pulled catechins out of green tea and made a UV protection setup with just a smartphone and a UV flashlight.
How I Cut Campus Server Latency by 73%
I copied our school server onto a Raspberry Pi and tried different load balancing tricks. The best one cut the worst-case latency by 73%.
How I Won the Structure Challenge by Breaking My Own Design
In the Maker Contest, we had to build a structure using the least material to hold the most weight. Halfway through gluing, I realized some sticks were in the wrong place. Then I looked at the base.
How I Got a Patent for a 3D-Printed Pen Holder
I bought a used 3D printer that was not perfect. Instead of buying a new one, I designed a pen holder that could survive printing errors. And I got a patent for it.
How I Built This Website for 8 RMB（1.2 USD）
I took an open-source blog project, put it on Cloudflare Workers, and only paid for the domain: about 8 RMB from Alibaba Cloud.