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.

ABSTRACT
1. 서 론
    1-1. 연구 배경 및 목적
    1-2. 연구 내용 및 방법
2. 고대 전각의 평면 규모와 유형
    2-1. 궁궐 정전
    2-2. 사찰 금당과 강당
3. 고대 전각의 대형 보 사용
    3-1. 중국
    3-2. 한국
    3-3. 일본
4. 중세 이후 전각의 대형 보 사용
    4-1. 중국
    4-2. 한국
    4-3. 일본
5. 한국 고대 전각에서 대형 보 사용의 전개와 의의
    5-1. 고대 전각에서의 대형 내진 공간의 출현 과정
    5-2. 중세 이후 대형 보 사용의 전개 양상
    5-3. 고대 전각에서의 대형 보 사용의 기술사적 의의
6. 결 론
참고문헌

• 이상명(국립문화유산연구원 건축문화유산연구실 연구원, 공학박사) | Lee Sang-Myeong (National Research Institute of Cultural Heritage. 132, Munji-ro, Yuseong-gu, Daejeon, Republlic of Korea) Corresponding author