KJCKorea
Journal Central

In this article, we reviewed the activities of Japanese warships thatweredispatchedtoJoseonfromthe1870sto1880stomeasure the coast to produce a nautical chart and collect regional information duringreconnaissanceactivities.ThewarshipsnotedhereareKasga, Takaomaru, and Amagi, and the records related to the voyage to Joseon remain well. The Kasuga was a warship used by Hanabusa Yoshimoto when he was dispatched to Joseon to take over the Waegwan.AtthetimeofthedispatchoftheKasugatoJoseon,Hanabusa and crew members carried and used books related to the system, history, and geography of Joseon, charts produced by U.S. ships as reference materials. By the time the Joseon-Japan Treaty of Amityweresignedin1876afterthewarshipUnyoincidentin1875, an opinion raising the need to measure the coast of Joseon came out in Japan. The coastal survey was reflected in subsection 7 of the Joseon-Japan Treaty of Amity. Japanese warships dispatched to Joseon along with diplomatic envoys to explore the treaty ports after the opening of Joseon included Takaomaru and Amagi. The survey record was prepared as a chart, and information on the area wasaddedasthesurveyworkwasrepeatedovertheyears.Inaddition, someofthecontentsofthenavigationlogwereeditedandprocessed

Thisarticleanalyzestheprocessandplansof Japantobuildrailroads on the Korean peninsula in order to invade the continent during the Sino-Japanese and Russo-Japanese wars. Japan built the railroad on the Korean peninsula in the name of countering Russia, so its purpose was military from the beginning. In addition, the Japanese realized from the First Sino-Japanese and Russo-Japanese wars that it was impossible to build a logistics system without railroads. As a result, not only the construction of the Gyeongbu Line and theGyeonguLine,butalsotheplansfortheKoreanPeninsulaRailway Network, which were centered on the Japanese Army after the Russo-Japanese War, gave priority to the role of logistics lines. Infact,therailwayplandrawnupbytheGeneralStaffoftheJapanese Army in 1909 was identical with the railway network that was eventually built on the Korean peninsula. This prioritization of the rail network for military purposes left behind a lack of east-west connectivity that remains a problem for Korea's railways to this day.

Kim Yu-shin's activities began after Daeya Castle fell in 642, whenhebecametheAbryangjugunju.ThismeansthatKimYu-shin became dedicated to the Daebaek Festival, and it later became an important turning point for the War against Baekje. Until 642, Silla was on the defensive, but began attacking Baekje in 644. Also, this was shown by Kim Yushin's active activities in the Jindeok period. TheWaragainstBaekjeof648wascarriedoutincloseconnection with Daedang diplomacy promoted by Kim Chun-chu. Therefore, Kim Yu-shin's activities at the War against Baekje influenced Kim Chun-chu's diplomacy policy toward Tang, and also played an important role in establishing the Silla-Tang Alliance. With the recapture of Daeya Castle in 648, the civil war between SillaandBaekjewasreversed.Baekje'spowerweakenedduetoheavy military damage, and this later became an important cause of its destruction.