1) THE BEGINNING OF USE OF REBARRNRNTHE DEVELOPMENT OF REBAR IS INSEPARABLE FROM THAT OF CONCRETE. THEREFORE, THE ADVENT OF REBAR IS CONSIDERED IN LINE WITH THE DEVELOPMENT PROCESS OF REINFORCED CONCRETE. THE ADVENT OF CONCRETE IS TRACED BACK TO THE ANCIENT EGYPT, GREECE AND ROMA. BUT, MORE RECENTLY, PORTLAND CEMENT BY JOSEF ASPDIN IN UK IN 1824 IS CONSIDERED AS THE ORIGIN OF CONCRETE. RNRNIN 1855, FRANCE’S LAMBOT INTRODUCED A BOAT MADE OF STEEL MESH INTO CONCRETE (REINFORCED CONCRETE) AT THE 1ST EXPOSITION UNIVERSELLE AND GOT A PATENT. STARTING WITH JOSEPH MONIER WHO STRENGTHENED A CEMENT CONTAINER WITH EMBEDDED IRON MESH IN 1861 AND OBTAINED A PATENT FOR IRON-REINFORCED CONCRETE IN 1867, THE USE OF REINFORCED CONCRETE WAS EXPANDED TO PIPES AND TANKS IN 1868, FURTHER TO FLAT PLATES IN 1869, BRIDGES IN 1873 AND STAIRS IN 1875, RNLATER IN 1887 GERMANY G.A WAYSS, J.BAUSCHINGER AND M.KOENEN PUBLISHED A THESIS ABOUT AN INTERPRETIVE METHOD FOR REINFORCED CONCRETE. IN THE U.S., THE LELAND STANFORD JR.MUSEUM CONSTRUCTED BY RANSOME IN SAN FRANCISCO IN 1890 TRIGGERED A RAPID DEVELOPMENT OF REINFORCED CONCRETE.RNRNIN THE 20TH CENTURY, PRE-STRESSED CONCRETE AND PRECAST CONCRETE WERE DEVELOPED. MOREOVER, A LOT OF RESEARCH ON HIGH-STRENGTH CONCRETE AND HIGH-TENSILE STRENGTH STEEL WERE CARRIED OUT, AND THEY WERE COMMERCIALIZED IN REALITY. RNRNRN2) CHANGES IN THE CONSTRUCTION METHOD OF REINFORCED CONCRETE IN KOREA RNRNIN KOREA, REINFORCED CONCRETE STARTED TO BE USED IN THE 1910S. THE FIST BUILDING BUILT WITH REINFORCED CONCRETE IS THE BUSAN MAIN CUSTOMS CONSTRUCTED IN NOVEMBER 1910, BUT THE TWO-STOREY BUILDING DOES NOT REMAINS ANY LONGER. THE BANK OF KOREA WHOSE CONSTRUCTION WAS COMPLETED IN JANUARY 1912 IS A BUILDING WITH 1 FLOOR UNDERGROUND AND 3 FLOORS ABOVE AT THE SITE OF 7,575㎡ . IT HAS BEEN DESIGNATED AS HISTORICAL SITE NO. 280. RNRNA GROWING NUMBER OF BUILDINGS STARTED USING REINFORCED CONCRETE IN THE 1920S. IN 1925, THE SEOUL STATION WAS CONSTRUCTED AND THE SEOUL CITY HALL AND THE NATIONAL MUSEUM IN 1926. RNIN THE 1930S, REINFORCED CONCRETE BUILDINGS WERE DESIGNED BY KOREAN ARCHITECTURES. THE MAIN BUILDING OF KOREA UNIVERSITY WHOSE CONSTRUCTION WAS COMPLETED IN 1934 WAS DESIGNED BY PARK GIL-RYONG, AND THE HWASHIN DEPARTMENT STORE WAS BUILT IN 1937. AS THE COUNTRY’S TALLEST BUILDING UNTIL THE 1960S, THE BANDO HOTEL BUILT IN 1938 WITH 1 FLOOR UNDERGROUND AND 8 FLOORS ABOVE SERVED AS A LANDMARK.RN