Windows Event Trace Log 포렌식 해석 및 활용

최요한(Yohan Choi),김준호(Junho Kim),박정흠(JungHeum Park),이상진(Sangjin Lee) 한국디지털포렌식학회 2021 디지털 포렌식 연구 Vol.15 No.3

초등학교 저학년의 인터넷 게임중독 예방을 위한 집단상담 프로그램 개발

최요한(Choi, YoHan),유형근(Yu, HyungKeun) 학습자중심교과교육학회 2014 학습자중심교과교육연구 Vol.14 No.12

본 연구의 목적은 초등학교 저학년 학생을 대상으로 인터넷 게임중독을 예방하기위한 집단상담 프로그램을 구안하여 그 효과를 검증하는데 있다. 프로그램의 개발절차는 조사, 분석, 설계, 구안, 적용의 5단계로 이루어졌다. 조사단계에서는 선행연구 를 고찰하고 인터넷 게임중독의 예방과 관련된 요구조사를 실시하였다. 분석단계에서는 프로그램의 목적, 영역별 목표, 회기별 목표를 설정하였고 설계단계에서는 전체 프로그램의 제시전략과 각 회기별 프로그램의 제시 방법을 결정하였다. 구안단계 에서는 프로그램 활동안을 수집, 평가, 선정, 보완하여 잠정안을 구안하였다. 적용단계에서는 실험집단에 프로그램을 적용하였고 사전, 사후검사 결과를 혼합변량분석(Mixed ANOVA)으로 효과를 검증하였으며 참가자의 경험보고서, 상담자의 관찰내 용 등도 함께 분석하였다. 그 결과, 프로그램에 참여한 실험집단과 통제집단의 게임중독 경향성에 유의한 차이가 있는 것으로 나타났다. 또한 내용분석에서도 실험 참가자들이 프로그램의 효과에 긍정적인 반응을 보였다. 본 연구는 초등학교 저학년의 인터넷 게임중독 예방을 위하여 그들의 특성과 요구에 부합하는 맞춤형 집단상담프로그램을 개발하여 게임중독 예방의 도구를 제시했다는 점에서 의의가 있다.

국민연금의 수급개시연령의 증가가 남성 고령자(58-60세)의 노동시장참여에 미치는 영향

최요한 ( Choi Yohan ) 한국보건사회연구원 2017 保健社會硏究 Vol.37 No.1

According to the reform in 1998 of the National Pension in South Korea, the pension eligibility age would increase, beginning in 2013, by one year every 5 years from the previous 60 until reaching 65. The increase in the pension eligibility age will lead to a net reduction in pension benefits, which is expected to result in a net income effect and increase the participation of the elderly in the labor market. The impact of pay incentives on people`s labor market behavior is information that is integral to the design of benefits. Therefore, in this study, we analyzed the effect of the increase in the pension eligibility age in South Korea on the labor market participation of the elderly, using a monthly Economically Active Population Survey, which is representative and provides sufficient number of observations. Specifically, we analyzed whether there is a difference in the labor market participation rate between the birth cohort 1945-52 with the pension eligibility age of 60 and the birth cohort of 1953-55 with the pension eligibility age of 61. Labor market participation was defined as `whether they worked more than 20 hours per week`, `more than 30 hours per week`, and `working more than 40 hours per week`. For this, we analyzed whether the trend of the labor market participation rate according to the cohort resulted in the discontinuity due to the difference in pension eligibility age after controlling for personal characteristics and labor market variables. However, there was no consistent evidence that the increase in the pensionable age from 60 to 61 had an impact on the labor market participation rate of the elderly.

한국어 자연어 추론을 위한 거대 언어 모델 기반 지식 생성

최요한(Yohan Choi),이창기(Changki Lee),배경만(Kyungman Bae) 한국정보과학회 2023 한국정보과학회 학술발표논문집 Vol.2023 No.6

주관적 건강인식은 실제 건강상태의 유효한 대리변수인가: 주관적 건강상태(SRH)와 주관적 건강변화상태(SACH)의 비교

최요한 ( Choi Yohan ) 한국보건사회연구원 2016 保健社會硏究 Vol.36 No.4

In numerous studies, subjective health is widely used as a proxy for actual health status. However, subjective health questions are exposed to reference group bias, adaptability bias, ceiling effect and floor effect, retention bias, and inter-individual heterogeneity, and may have significant measurement errors. Therefore, it is important to verify that subjective health is an effective proxy for actual health status. The purpose of this study was to examine whether self-rated health and self-assessed change in health predict the actual health status (diagnosis of disease and experience of hospitalization and accident) of middle-aged and older South Koreans, using the Korea Longitudinal Study of Aging. In order to control individual heterogeneity, we analyzed whether the subjective health of health status change between two time points effectively predicts the occurrence of actual health problems between two time points. To ensure the validity of the study, various health variables were analyzed. The analysis showed that the negative changes of SRH and SACH in all models without age group significantly predicted the occurrence of health problems. It was also found that SACH predicts health problems much better than SRH. However, by analyzing by age group, the predictive power of SRH decreased significantly, but the predictive power of SACH remained high. Therefore, it is effective to use subjective health as a surrogate variable of actual health status in Korea. However, if possible, using SACH as a proxy for actual health status would be preferable to using SRH.

심층강화학습에 은닉 상태 정보 활용을 통한 학습 성능 개선에 대한 고찰

최요한 ( Yohan Choi ),석영준 ( Yeong-jun Seok ),김주봉 ( Ju-bong Kim ),한연희 ( Youn-hee Han ) 한국정보처리학회 2022 한국정보처리학회 학술대회논문집 Vol.29 No.1

심층강화학습에 완전 연결 신경망과 합성곱 신경망은 잘 활용되는 것에 반해 순환 신경망은 잘 활용되지 않는다. 이는 강화학습이 마르코프 속성을 전제로 하기 때문이다. 지금까지의 강화학습은 환경이 마르코프 속성을 만족하도록 사전 작업이 필요했다, 본 논문에서는 마르코프 속성을 따르지 않는 환경에서 이러한 사전 작업 없이도 순환 신경망의 은닉 상태를 통해 마르코프 속성을 학습함으로써 학습 성능을 개선할 수 있다는 것을 소개한다.

지방의료원의 환경요인에 따른 공공성지표 차이 분석

최요한 ( Yohan Choi ),김영훈 ( Young-hoon Kim ),한휘종 ( Whi-jong Han ) 한국병원경영학회 2019 병원경영학회지 Vol.24 No.2

The aim of this study is to analyze the differences in the publicness indices depending on the environmental factors of regional public hospitals to derive the policy implications for improving management for regional public hospitals. The data of the 34 regional public hospitals from 2016 was used for the analysis. Major results of this study are as follows. First, the analysis of the differences in the scores of the medical safety net function showed significantly higher scores for regional public hospitals with a larger location, a larger number of hospitals in a unit area, a larger number of nurses per 100 beds, and the lower management fee ratio. Second, the analysis of the differences in the scores of the unmet healthcare needs showed significantly higher scores for regional public hospitals with a larger number of hospitals in a unit area, and a larger number of beds. Third, the analysis of the differences in the scores of the hospital-specialized services showed significantly higher scores for regional public hospitals with a larger location, a higher financial independence of the local government, a larger number of hospitals in a unit area, a larger number of beds, and a larger number of nurses per 100 beds. Major conclusions of this study are as follows. Consideration should be given to the appropriate number of nurses for each regional public hospital to maximize publicness by providing the appropriate amount of medical services, but not to incur unnecessary labor costs. In addition, efforts should be made to enhance profitability, which can be a means of strengthening publicness, by identifying the minimum administrative expenses required for efficient operation and reducing unnecessary administrative expenses. Finally, it is necessary to identify the appropriate number of beds to meet the needs of the customers and to create maximum profits.

사업장 폐업으로 인한 실업이 주관적인 건강상태에 미치는 영향: 한국노동패널(2003-2012년) 분석

최요한 ( Choi Yohan ) 한국보건사회연구원 2014 保健社會硏究 Vol.34 No.4

Rapidly increasing rate of unemployment in 1970-1980 greatly raised academic interests about the effects of unemployment on health. Many theories anticipated that unemployment would have negative effects on health. However, empirical studies mostly conducted in developed countries found that unemployment did not have the negative effects on health. To analyze causal effects of the unemployment on health, it is necessary to control the cause of unemployment. Existing studies have analyzed the effect of unemployment due to plant closure on health. Thus, this study analyzed the effect of the unemployment due to plant closure on self-rated health in Korea based on data from Korea Labor & Income Panel Study (2003-2012). The results of the study found that the unemployment due to plant closure had negative effects on self-rated health among unemployed men, whereas self-rated health of reemployed men were not affected by the unemployment due to plant closure. On the contrary, unemployment due to plant closure did not have negative effects on self-rated health among women.

0-1 배낭 문제에 대한 강화학습 에이전트의 확장성에 관한 연구

최요한(Yohan Choi),석영준(Yeong-Jun Seok),지창훈(Chang-Hun Ji),이재원(Jae-Won Lee),한연희(Youn-Hee Han) 한국통신학회 2023 한국통신학회 학술대회논문집 Vol.2023 No.6

국민기초생활보장제도의 수급이 우울에 미치는 영향

최요한 ( Choi Yohan ) 한국사회보장학회 2018 사회보장연구 Vol.34 No.4

This study estimates the impact of the basic livelihood benefit (the National Basic Livelihood Security System) on depression in South Korea. The 1st to 12th waves (2006-2017) of the Korea Welfare Panel Study are used as data sources, and the CES-D 11 scale is adopted to distinguish between depression and non-depression. In order to explore an appropriate estimation model, five models with different assumptions about (a) individual time-invariant unobserved heterogeneity; (b) conditional state dependence of dependent variables; and (c) feedback effects are analyzed. The results of analyzing those over and under 60 respectively show that receipt of the benefits does not appear to have affected their depression. This has resulted probably because the level of the benefits is not sufficient, or because it is difficult to reduce depression that easily. It also appears that an appropriate estimation model is needed to bring under control not only individual time-invariant unobserved heterogeneity but also conditional state dependence of dependent variables. It may be because depression itself increases the probability of being a basic livelihood benefit recipient, or because individual time-variant unobserved heterogeneity affects both depression and the probability of becoming a benefit recipient.