Ju Si-gyeong

Ju Si-Gyeong (December 22, 1876 - July 27, 1914) was one of the founders of modern Korean linguistics. He was born in Bongsan County, Hwanghae Province. He and his students helped standardize the Korean language, based spelling and grammar of the vernacular. 

He studied Classical Chinese from his childhood. After studying modern linguistics in Seoul, he established the Korean Language System Society in 1896. He hosted several seminars in the National Language Discussion Center of the Sangdong Youth Academy of the Korean language. 

He proposed that the Korean parts of speech include nouns, verbs, adjectives, adverbs, unconjugated exclamations, and sentence-final particles.

In his 1914 publication, Sounds of the Language, he promotes writing Hangul linearly rather than syllabically. This is one of is few proposals not to have been implemented, although there have been experiments with linear hangual, most notably in Primorsky Krai.