This study examines the process to demolish official buildings of Joseon Dynasty in Suwon Hwaseong during Japanese colonial period. King Jeongjo built the new Suwon city and constructed the city fortress. Hwaseong Hawnggung and other official buildings were also built in Suwon Hwaseong. However Those buildings were demolished gradually and lost their identity during Japanese colonial period. The official buildings of Hwaseong Haenggung were classified into nine parts. 1) Central area of Hwaseong Haenggung 2)Nangnamheon(落南軒) 3)Uhwaguan(于華館) 4)Namgunyeong(南軍營) 5)Bukgunyeong(北軍營) 6)Gangmudang(講武堂) 7)Yiah(貳衙) 8)Jungyeong(中營) 9) Hoeryungjun(會寧殿). Bukgunyeong was the first demolished building in Suwon Hwaseong. Nangnamheon and Hwaryungjun were not destroyed during Japanese Colonial Period. from 1910s to 1930s most official buildings were demolished and new buildings were rebuilt.

Historical Experience Program is a certain type of a field trip for elementary and middle school students, which includes visiting a historical place and having various outdoor activities related to the historical events that actually happend in the area. Usually the students make a group to participate, but the education is only done with the printed handouts and the guidance teacher's verbal explanation. In this research, we would like to make use of both location-based system and gamification theories to advance the educational form. Each students will be given smart devices to perform the tasks that are conducted by gamifying the historical information and materials. Location-based system will be guiding them to find the missions and clues around the area. The guidance teacher will be also using a smart device to figure out each student's location and how well they are performing. We've also run the actual field test, and found out that it was a very effective method for Historical Experience Programs. Students were very motivated by cooperting and competing with other students on gamified educational material, and had been very ammused by having outdoor activities using location-based system, and it lead to a significantly effective education.

Many properties of Hwaseong were restored in 1970s. The existence of Hwaseong songyouk eugye has enabled restoration of Hwaseong in the short period of time. In addition, Hwaseong was enlisted on World Heritage by recognition of its authenticity. We have been making repairs constantly until it was restored 40 years ago and we dismantled and repaired Paldalmun lately. This year we decided to dismantle and repair Dongnamgagru of Hwaseong due to its leaning. I on this occasion studied on the original form of Dongnamgagru of Hwaseong and thereby I figured out the use of it and identified the differences from its present status by analyzing and synthesizing the contents of Eugye.

This study progressed an investigation on the cause of the efflorescence phenomenon of bricks in Suwon Hwaseong Fortress, which is designated as a UNESCO World Heritage by using diverse scientific analyses. The samples were taken in Hwaseong and analyzed using XRD and SEM-EDS for the material identification of efflorescence. We observed under a polarizing microscope and measured absorption factors for the basic investigation for traditional bricks. As a result of material identification, soluble salt(Na2SO4, KNO3) and insoluble salt(CaCO3) were detected. There was no big difference between original bricks and repaired bricks under the polarizing microscope. However, in terms of the water absorption rate, bricks which were used for repair nowadays showed low water absorption rate(1%). In conclusion, soluble salt and insoluble salt appeared due to an effect of an air pollution and joint mortar. Soluble salt was removed in the rainy season, but insoluble salt was not removed. As a result of the efficiency and safety tests for chemicals removing efflorescence, chemical E is likely to be the suitable chemicals for the efflorescence phenomenon of traditional bricks in Suwon Hwaseong Fortress. In the future, consideration whether the use of lime is available or not should be studied through comprehensive researches including repair work, construction work and the environment factor with lime. Also, physical, chemical identifications of repairing bricks will be required.