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김명화 ( Myung Hwa Kim ),권순만 ( Soon Man Kwon ),김홍수 ( Hong Soo Kim ) 한국보건경제정책학회 2013 보건경제와 정책연구 Vol.19 No.3
The purpose of this study was to analyze the effect of long-term care utilization on health care utilization of the elderly. The sample in this study includes 23,269 people older than 65 who are extracted from 2009-2010 long-term care insurance and health insurance claim data. The study group was divided into two groups, namely acute care hospitals and long-term care hospitals. Two part model were used for statistical analysis and instrumental variables analysis were used for controlling endogeneity in the group of long-term care hospitals. This study evaluated the impact of long-term care costs on the probability of health care utilization experience and costs of health care utilization. The results showed that an increase in long-term care costs was associated with an increase in utilization of acute care hospitals, but it was associated with a decrease in utilization of long-term care hospitals. When 1% increase in long-term care costs was associated with 0.5% decrease in costs of long-term care hospitals. On the basis of results, this study concludes that long-term care utilization and utilization of long-term care hospitals for older people are substitutes.
건강보험 청구자료를 이용한 일반 질 지표로서의 위험도 표준화 재입원율 산출: 방법론적 탐색과 시사점
김명화 ( Myung Hwa Kim ),김홍수 ( Hong Soo Kim ),황수희 ( Soo Hee Hwang ) 한국보건행정학회 2015 보건행정학회지 Vol.25 No.3
Background: The purpose of this study was to propose a method for developing a measure of hospital-wide all-cause risk-standardized readmissions using administrative claims data in Korea and to discuss further considerations in the refinement and implementation of the readmission measure. Methods: By adapting the methodology of the United States Center for Medicare & Medicaid Services for creating a 30-day readmission measure, we developed a 6-step approach for generating a comparable measure using Korean datasets. Using the 2010 Korean National Health Insurance (NHI) claims data as the development dataset, hierarchical regression models were fitted to calculate a hospital-wide all-cause risk-standardized readmission measure. Six regression models were fitted to calculate the readmission rates of six clinical condition groups, respectively and a single, weighted, overall readmission rate was calculated from the readmission rates of these subgroups. Lastly, the case mix differences among hospitals were risk-adjusted using patient-level comorbidity variables. The model was validated using the 2009 NHI claims data as the validation dataset. Results: The unadjusted, hospital-wide all-cause readmission rate was 13.37%, and the adjusted risk-standardized rate was 10.90%, varying by hospital type. The highest risk-standardized readmission rate was in hospitals (11.43%), followed by general hospitals (9.40%) and tertiary hospitals (7.04%). Conclusion: The newly developed, hospital-wide all-cause readmission measure can be used in quality and performance evaluations of hospitals in Korea. Needed are further methodological refinements of the readmission measures and also strategies to implement the measure as a hospital performance indicator.
김명화,권순만,Kim, Myung-Hwa,Kwon, Soon-Man 대한예방의학회 2010 Journal of Preventive Medicine and Public Health Vol.43 No.6
Objectives: The purpose of this study was to analyze the effect of outpatient cost-sharing on health care utilization by the elderly. Methods: The data in this analysis was the health insurance claims data between July 1999 and December 2008 (114 months). The study group was divided into two age groups, namely 60-64 years old and 65-69 years old. This study evaluated the impact of policy change on office visits, the office visits per person, and the percentage of the copayment-paid visits in total visits. Interrupted time series and segmented regression model were used for statistical analysis. Results: The results showed that outpatient cost-sharing decreased office visits, but it also decreased the percentage of copayment-paid visits, implying that the intensity of care increased. There was little difference in the results between the two age groups. But after the introduction of the coinsurance system for those patients under age 65, office visits and the percentage of copayment-paid visits decreased, and the 60-64 years old group had a larger decrease than the 65-69 years old group. Conclusions: This study evaluated the effects of outpatient cost-sharing on health care utilization by the aged. Cost sharing of the elderly had little effect on controlling health care utilization.
비의 양이 지수분포를 따르는 경우 무한 댐의 최적 방출정책 연구
김명화,백지선,최승경,이의용,Kim, Myung-Hwa,Baek, Jee-Seon,Choi, Seung-Kyoung,Lee, Eui-Yong 한국데이터정보과학회 2011 한국데이터정보과학회지 Vol.22 No.6
본 논문에서는 댐으로 물이 복합 포아송 과정을 따라 유입되고, 댐 수위가 적정수준 ${\lambda}$를 넘어서게 되면 방출률 M으로 물을 방출하는 무한 댐 모형이 고려된다. 한번 내리는 비의 양이 지수분포를 따르는 경우, 정상상태에서 댐 수위의 확률적 성질들을 구한다. 댐 운영과 관리에 관련된 여러 비용을 고려한 후, 장시간에 걸친 단위시간당 평균 비용을 구하고, 이를 최소화하는 방출률 M과 적정수준${\lambda}$가 유일하게 존재함을 보인다. MATLAB을 이용하여 수치적인 결과도 함께 보인다. We consider an infinite dam with inputs formed by a compound Poisson process and adopt a $P^M_{\lambda}$-policy to control the level of water, where the water is released at rate M when the level of water exceeds threshold ${\lambda}$. We obtain interesting stationary properties of the level of water, when the amount of each input independently follows an exponential distribution. After assigning several managing costs to the dam, we derive the long-run average cost per unit time and show that there exist unique values of releasing rate M and threshold ${\lambda}$ which minimize the long-run average cost per unit time. Numerical results are also illustrated by using MATLAB.
김명화 ( Myung-hwa Kim ),이민수 ( Minsoo Lee ) 한국정보처리학회 2006 한국정보처리학회 학술대회논문집 Vol.13 No.1
최근 IT 분야의 가장 큰 화두인 유비쿼터스 혁명을 주도하고 있는 네트워킹 기술은 급격한 기술 변화로 다른 분야에 많은 영향을 끼치고 있다. 이러한 네트워킹 기술의 발달은 더 이상 정적인 네트워크가 아닌 움직이는 네트워크 즉, 네트워크 이동성 (network mobility) 개념을 등장시켰다. 조직 혹은 기업에서는 작업 프로세스의 향상뿐만 아니라 제품 생산 능력 향상의 기회를 제공해 줄 수 있는 워크플로우 시스템은 아직 모바일 네트워크간의 동적인 환경에서 사용상의 제약이 있다. 따라서 본 연구에서는 모바일 네트워크의 이동성을 고려하여 워크플로우를 지원하는 방법을 모색하고자 한다.