https://www.yongwhan.io/writing.html Working notes on AI systems, competitive programming, practice, mentorship, and technical education. en-us Sat, 12 Sep 2026 12:00:00 -0400 https://www.yongwhan.io/institutional-systems-case-study.html https://www.yongwhan.io/institutional-systems-case-study.html Sat, 12 Sep 2026 12:00:00 -0400 Institutional systems A public case study in connecting selection, contribution, mentorship, public products, measurement, shared ownership, and succession. https://www.yongwhan.io/contest-release-anatomy.html https://www.yongwhan.io/contest-release-anatomy.html Sat, 12 Sep 2026 11:00:00 -0400 Contest reliability A release-safe field guide to specifications, independent solutions, adversarial submissions, generated data, automation, and human sign-off. https://www.yongwhan.io/technical-leadership-playbook.html https://www.yongwhan.io/technical-leadership-playbook.html Sat, 12 Sep 2026 10:00:00 -0400 Technical leadership Concrete mechanisms for decision clarity, early risk communication, apprenticeship, sponsorship, recognition, and organizational memory. https://www.yongwhan.io/problem-solving-notebook.html https://www.yongwhan.io/problem-solving-notebook.html Sat, 12 Sep 2026 09:00:00 -0400 Problem solving An annotated AtCoder solution using reverse traversal on the divisibility order, affine operation counts, and a feasible interval. https://www.yongwhan.io/production-decision-framework.html https://www.yongwhan.io/production-decision-framework.html Fri, 11 Sep 2026 12:00:00 -0400 Decision systems Turn an ambiguous technical question into a reviewable choice across quality, cost, risk, delivery time, and reversibility. https://www.yongwhan.io/ending-systems-responsibly.html https://www.yongwhan.io/ending-systems-responsibly.html Fri, 11 Sep 2026 11:00:00 -0400 Technical stewardship A practical closeout checklist for infrastructure, cost, access, ownership, retained knowledge, and final operating state. https://www.yongwhan.io/fifteen-years-in-icpc.html https://www.yongwhan.io/fifteen-years-in-icpc.html Sat, 22 Aug 2026 12:00:00 -0400 ICPC Reflections across competing, coaching, judging, organizing, and teaching—and what those roles reveal about the real work of problem solving. https://www.yongwhan.io/building-a-competitive-programming-community.html https://www.yongwhan.io/building-a-competitive-programming-community.html Sat, 22 Aug 2026 11:00:00 -0400 Community An entry ramp, durable weekly rituals, leadership succession, and institutional memory matter more than one exceptional team. https://www.yongwhan.io/reviewing-an-icpc-contest.html https://www.yongwhan.io/reviewing-an-icpc-contest.html Sat, 22 Aug 2026 10:00:00 -0400 Coaching The scoreboard records outcomes. A useful review reconstructs decisions, failure modes, and team interactions. https://www.yongwhan.io/coaching-without-taking-ownership.html https://www.yongwhan.io/coaching-without-taking-ownership.html Sat, 22 Aug 2026 09:00:00 -0400 Coaching A coach should make reasoning visible and feedback precise—not become the hidden fourth contestant. https://www.yongwhan.io/choosing-problems-for-practice.html https://www.yongwhan.io/choosing-problems-for-practice.html Sat, 22 Aug 2026 08:00:00 -0400 Practice A four-stage sequence for isolating weaknesses, varying ideas, testing transfer, and finally adding pressure. https://www.yongwhan.io/from-editorial-to-technique.html https://www.yongwhan.io/from-editorial-to-technique.html Sat, 22 Aug 2026 07:00:00 -0400 Practice Turn an explanation into reconstructed reasoning, independent implementation, and evidence of transfer. https://www.yongwhan.io/reliable-voice-agents.html https://www.yongwhan.io/reliable-voice-agents.html 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/practice-that-compounds.html https://www.yongwhan.io/practice-that-compounds.html 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/mentorship-is-leverage.html https://www.yongwhan.io/mentorship-is-leverage.html 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.