Dynasty and Japanese colonial period using historical texts and dictionaries. For Mat-bae roofs, component-related terms include Bak-gong, Bak-poong, Poong-pan, and Poong-cha, while Bae-jip refers to the roof as a whole. Bak-gong was more commonly used than its synonym Bak-poong, and its Chinese character representation varied. Poong-pan, derived from Pung-cha, replaced it in the 19th century, while Bae-jip’s use in Joseon-era texts is unclear. For Pal-jak roofs, component terms include Chu-nyeo and Hap-gak, while Paljak refers to the entire roof. Chu-nyeo has both linear and planar meanings and appeared with diverse Chinese character forms and Korean spellings, evolving over time. Hap-gak, synonymous with Heo-ga, became recognized as a native term until the 1940s. Pal-jak, often written as 八雀 in Joseon texts, likely originated from the Korean mimetic word Pal-jjak, reflecting its meaning and sound.
In this paper, we examined how large beams were developed in Korea, China, and Japan in the 6th and 8th centuries, and how this pattern affected Korean architecture later. A large inner space was required to symbolize the authority of the emperor and king and to achieve the purpose of enshrinement of a large Buddha statue forming a cluster, and a large beam over 9m was used to implement this. The use of large beams is confirmed from the late 4th century in China and from the late 5th century at the Seoyeongchonsa Temple Site in Nanjing. In Korea, it is identified from the Lecture hall of Neungsan Risa Temple Site in Baekje(567) and from the middle Buddhist shrine Temple in Hwangnyongsa Temple in Silla(584). Goguryeo is presumed to be around the 6th century, a little earlier than that. In Japan, large beams were used for the first time at the the Lecture hall of Bijosa Temple in 588, which was built by a Baekje engineer. From ancient times to the modern era, the inner space length of the Korean, Chinese, and Japanese architecture was exceptional in some cases, but 9-12m was common. This is judged to be the result of the experience of the material limitation of wood and the size of the inner space established in ancient architecture affecting future generations as a precedent.
This study traces the origin and development of 8-cheok as a standard spatial unit in Korean architecture by examining historical texts. Rooted in ancient Chinese body-based measurement systems, 8-cheok originally represented the average human height. Although its direct anthropometric basis faded over time as measurement units lengthened, 8-cheok remained prominent in both literary and architectural contexts. The palcheok-bang (eight-cheok house), first mentioned in the Samguk Yusa , symbolized a hermit’s dwelling and retained its symbolic meaning throughout the Goryeo period. In the Joseon era, influenced by Neo-Confucian values of restraint and humility, the palcheok-kan (eight-cheok module) emerged as a spatial standard reflecting the moral ideals of the Confucian elite. However, the palcheok-kan competed with other modular units. During the construction of the Seoul city walls, a conversion of 10 cheok per kan was used, while land surveys in the city sometimes adopted 7 cheok per kan . From the 17th century onward, however, the 8-cheok -per-kan conversion gradually gained dominance and became the representative unit. Despite its widespread use, the palcheok-kan was never formally codified by law and remained a customary standard until it disappeared during modern measurement reforms.