Sungwook Kim

10.5626/JOK.2025.52.11.923

Old Hangul input method editor continuous input 2-set keyboard Yeoneum (liaison) Bangjeom (dot tone mark)

The main difference between modern Hangul and Old Hangul input lies in continuity. There are three factors that make continuous input of Old Hangul difficult. First, the Old Hangul keyboard is unintuitive. The conventional layout of Old Hangul alphabets on the 2-set keyboard lacks a correlation between modern Hangul and Old Hangul alphabets. This misalignment makes it challenging to locate and input Old Hangul alphabets. Second, inputting Old Hangul initial compound consonants poses a challenge. Unlike modern Hangul, Old Hangul includes compound consonants in the initial position. Existing Old Hangul Input Method Editors (IMEs) can input initial compound consonants only after completing the composition, rendering continuous input of Old Hangul impossible. Third, inputting Bangjeom is problematic. Existing Old Hangul IMEs are difficult to input Bangjeom, and also finish composing when it is input, preventing further letter combinations. Due to these issues, inputting Old Hangul becomes difficult. As a solution to these issues, this paper proposes a placement of Old Hangul alphabets in accordance with the creation principle of Hunminjeongeum, and a method for continuous input of Old Hangul using the Yeoneum button and the Bangjeom button.