https://www.yongwhan.io/writing.html Working notes on AI systems, competitive programming, practice, mentorship, and technical education. en-us Fri, 14 Aug 2026 12:00:00 -0400 https://www.yongwhan.io/writing.html#voice-agents https://www.yongwhan.io/writing.html#voice-agents Fri, 14 Aug 2026 12:00:00 -0400 AI systems The model matters, but the user experiences the entire system: latency, interruptions, tools, state, evaluation, and recovery. https://www.yongwhan.io/writing.html#practice https://www.yongwhan.io/writing.html#practice Fri, 14 Aug 2026 11:00:00 -0400 Practice A useful practice session should change how you approach the next problem, not merely add one more accepted solution to a profile. https://www.yongwhan.io/writing.html#mentorship https://www.yongwhan.io/writing.html#mentorship Fri, 14 Aug 2026 10:00:00 -0400 Mentorship Good mentorship improves the quality and timing of feedback while leaving ownership of the work with the person being mentored.