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BetaEssential Guitar Chords — 218 searchable voicings across open chords, open-tension forms, alternate tunings, jazz drop-2/drop-3, and electric triads. Every diagram plays, labels its notes, and works offline.
BetaNurse shift scheduler built on a CP-SAT constraint solver — monthly rotas for multi-role wards, nurse shift requests, realtime updates, staff invites, and per-nurse calendar (ICS) export.
BetaWorshipFlow — run a worship service end to end: an 867-song library with versions, song forms and YouTube references, setlist (콘티) building, and a score viewer that follows the setlist order on stage.
Projects grouped by what they're about — badges show maturity (Live · Beta · Concept).

Essential Guitar Chords — 218 searchable voicings across open chords, open-tension forms, alternate tunings, jazz drop-2/drop-3, and electric triads. Every diagram plays, labels its notes, and works offline.
Interactive beginner's guide to worship drumming — bilingual (EN/KR), every pattern an audible looping GrooveGrid with a tempo trainer. Crash course first, then the fundamentals that earn it.

Guitar Builder — shape a build (TARGET) against a reference instrument (BASE) on the same ~110 parameters, hear the physics-simulated tone delta, and export real CAD. Pickups are modelled per instrument and by type (single/humbucker/P-90/piezo/mic) — a piezo or mic puts the soundboard itself in the loop. No modes: a 34" scale is a bass. (Merged TACO + PASTA.)

Nurse shift scheduler built on a CP-SAT constraint solver — monthly rotas for multi-role wards, nurse shift requests, realtime updates, staff invites, and per-nurse calendar (ICS) export.
A medical-device feasibility study for real-time IV insertion navigation in DIVA patients: a rule-based CV prototype that fell short of reliable localization, plus the MFDS productization dossier and medical-device RA study built around it.

WorshipFlow — run a worship service end to end: an 867-song library with versions, song forms and YouTube references, setlist (콘티) building, and a score viewer that follows the setlist order on stage.

An honest data-science study of the Korean lottery: a 9-stage curriculum (probability → testing → Bayesian → ML → unsupervised → backtest) whose conclusion is that no usable signal exists. Not a prediction tool — a proof of why prediction fails.