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韓永愚 ( Han Youngwoo ) 진단학회 2021 진단학보 Vol.- No.136
Scholar-officials in premodern Korea and China seldom doubted the existence of Kija Joseon in ancient Korean history. During the Japanese colonial period in the twentieth-century, the Japanese colonialist historians falsely claimed that Kija Joseon had been a Chinese colony. This prompted the nationalist historians at that time to deny the existence of Kija Joseon and to consider it as an outcome of historical fabrication. Since then, Kija Joseon had faded away in ancient Korean history. These scholars remain dubious of the authenticity of archaelogical remains and artifacts supposedly linked to Kija Joseon and emphasize that historical sources evidencing Kija’s migration to Korea only appeared much later in the sources of the Han Dynasty. The belated appearance of documents in the Han period testifying to Kija’s migration, in my view, however, may have been due to the facilitated influx of Korean historical information into China caused by the increasingly intimate relations between the two countries during the Han Dynasty. This article argues that the possibility of Kija Joseon’s actual existence should be taken more seriously. First, Koguryo that inherited the territory and tradition of Old Joseon venerated Kija as a local god along with Tan’gun. While Tan’gun was worshiped as the founder of Early Joseon, the cult of Kija was premised on the belief that he was the founder of Later Joseon. Second, numerous historical sources including official dynastic histories specifically mentioned that Seonu(鮮于), Han(韓), and Ki(奇) clans of Korea were the descendants of Kija. From early on, these clan members were aware of their descent from Kija and played important roles in building a Kija shrine in Pyongyang and boosting Kija worship during the Koryo and Joseon periods. Furthermore, this article traces the trajectory of how the perceptions of Kija evolved and how the studies on Kija Joseon were carried out by scholar-officials during the Koryo and Joseon periods. Their scholarly efforts demonstrate their on was a historical reality.
기계학습을 이용한 아파트 매매가격 예측 연구 : 한국 아파트의 내·외적 데이터 수집과 가격 예측 중심으로
주정민 ( Jeong-min Ju ),강선미 ( Sun-mee Kang ),최지웅 ( Ji-wung Choi ),한영우 ( Youngwoo Han ) 한국정보처리학회 2020 한국정보처리학회 학술대회논문집 Vol.27 No.2
본 연구에서는 아파트를 대표할 수 있는 내·외적 데이터를 수집하고 인공지능 기술들을 활용하여 아파트 가격을 예측하는 시스템을 구축하고자 한다. 구체적으로 웹크롤링 기법을 통해 수집한 아파트 내·외적 데이터의 변수들에 대한 특성 선택(Feature Selection)을 수행하였고, 다양한 인공지능 기법을 활용하여 부동산 가격 예측 모형을 개발하였다. 아파트 가격 예측 모형 생성을 위해 Linear Regression, Ridge, Xgboost, Lightgbm, Catboost 등의 기계학습 알고리즘을 사용하였고, RMSE를 사용하여 각 예측 모형 간의 성능 비교를 수행하였다. 가장 성능이 좋은 예측 모형은 Xgboost기반 예측 모형이였으며, RMSE값이 약 0.0366으로 가장 낮았으며 테스트 데이터에 대한 정확도는 약 95.1%였다.