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허재혁,이웅섭 한국정보통신학회 2023 한국정보통신학회논문지 Vol.27 No.8
In this paper, we explore customer churn in a telecommunication company, measuring the probability of users discontinuing their service. Our investigation employs various machine learning models, including Decision Tree, Random Forest, XGBoost, LightGBM, SVM, Logistic Regression, and Deep Neural Network. To accomplish this, we leverage data collected from a California-based telecommunication company, initially containing 38 feature data. In order to reduce complexity, we apply Lasso regression to select the five most crucial features for determining customer churn: household situation, service satisfaction, loyalty, payment capability, and contract type. Through performance evaluation, we demonstrate that accurate predictions of customer churn can be achieved even with five features, emphasizing the significance of feature selection.
건강보험심사평가원 자료를 이용한 5년간(2003-2007년) 치매 환자치료 추세동향
허재혁,김형수,배희준,이건세,배명훈,이정빈 대한치매학회 2010 Dementia and Neurocognitive Disorders Vol.9 No.1
In Korea, the elderly population and the prevalence of dementia has increased rapidly. The aim of this study is to describe and analyze the status in treatment of dementia for recent 5 yr in Korea. Methods: The Health Insurance Review & Assessment Service (HIRA)’s data which had various variables during 5 yr from 2003 to 2007 was used. Dementia was analyzed by the visit days, benefit amounts, and real patients in Out Patient Department (OPD) and admission. In addition, the distributions of the clinical department for dementia were presented. Results: The days of OPD visit and admission for dementia increased from 328,967 (2003,OPD) and 1,821,825 (2003, admission) to 765,599 (2007, OPD) and 7,433,913 (2007, admission). The benefit amounts of OPD and admission increased from 11,884,657,000 won (2003,OPD) and 64,742,232,000 won (2003, admission) to 40,849,297,000 won (2007, OPD) and 366,694,852,000 won (2007, admission). The real patients of OPD and admission increased from 59,861 (2003, OPD) and 18,515 (2003, admission) to 132,869 (2007, OPD) and 63,141(2007, admission). Among the clinical departments, in 2007, department of neurology had the greatest percentage in visit days (OPD). Conclusions: This study clarifies the magnitude of the dementia treatment in the viewpoint of visit days, benefit amounts, real patients, and the distribution of the clinical department treated at. Department of Neurology had a major role in dementia care, which had been increasing during 5 yr.