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역전파 알고리즘을 응용한 인구통계학 기반 서울 주택가격 변화 예측 연구
송영서(Young Suh Song),김현우(Hyunwoo Kim),조원선(One-Sun Cho) 대한전자공학회 2020 전자공학회논문지 Vol.57 No.10
본 논문에서는 대한민국의 연도별 출생아 수 데이터와 머신러닝 알고리즘을 활용하여 서울 주택가격 변화를 예측하였다. 더 정확한 예측을 위하여 머신러닝 알고리즘 중에서 역전파 (Back propagation) 알고리즘을 사용하였으며, 가상 GDP 성장률과 예상 수명 연장률이 고려되었다. 예측 결과, 서울 주택가격은 2025년까지 꾸준히 증가하며, 2025년부터 2033년까지는 큰 상승없이 유지가 되다가 2033년 이후부터는 다시 하락할 것으로 예측되었다. 결국, 2040년경에는 2020년 현재의 주택가격과 비슷한 수준으로 돌아올 것이 전망되었는데, 이는 저출산 영향으로 앞으로 만 25세 이상의 인구수가 점차 감소하여 주택의 수요 또한 감소할 것이기 때문으로 해석되었다. In this paper, housing price in Seoul of Republic of Korea was predicted by utilizing annual birthrate data in Republic of Korea and machine learning algorithm. In order to conduct more accurate prediction, a back propagation algorithm was used among machine learning algorithms, and virtual GDP growth rate and expected life extension rate were considered. As a result, house price in Seoul is expected to increase steadily until 2025, and remain almost unchanged from 2025 to 2033, and then fall again after 2033. Eventually, it was expected that the house price of Seoul will return to a level similar to current house price of Seoul. This result was due to decrease in the number of people over the age of 25 from low fertility phenomenon, which results in decrease in demand for house.
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김진규,김원록,이영근,김재성,송희섭,정철영,김기남,서원선,홍광표 ( Jin Kyu Kim,Won Rok Kim,Young Keun Lee,Jae Sung Kim,Hi Sup Song,Cheorl Young Jeong,Ki Nam Kim,One Sun Suh,Kwang Phyo Hong ) 한국환경생물학회 1998 환경생물 : 환경생물학회지 Vol.16 No.2
Tradescantia in BNL 4430 is a hybrid clone heterozygous for its flower color and extremely sensitive to ionizing radiation. Such a fact made people around nuclear power plants be interested in Tradescantia, a botanical tester of radiation effects. The pur pose of this study is to provide the botanical supplement to physical radiation monitor systems and also to ascertain biological safety regarding environmental radiation around nuclear power plants. Flowers collected periodically from three Tradescantia gardens (in Youngkwang NPP Jeonsigwan. City office and KAERI. respectively) were scored for pink mutation frequencies in stamen hair cells. Pink mutation frequencies in the study area were in the range of 0.82∼1.14. which were slightly lower than the annual mean background mutation frequency of 1.16. Statistical analysis of scoring data showed that there was no significant difference between three Tradescantia gardens (p>0.05). From the result, the environmental radiation level around Youngkwang nuclear power plant can be said biologically safe. Further study for verifying safety will make a role for improving public acceptance related to the peaceful use of nuclear power.
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