DEA-AR/AHP 결합모형을 이용한 지방의료원의 효율성 분석

양동현,Yang, Dong-Hyun 한국보건행정학회 2010 보건행정학회지 Vol.20 No.4

The purpose of this empirical study is to evaluate efficiency of the regional public hospitals, using DEA(Data Envelopment Analysis). to do this, we design a DEA-AR/AHP Hybrid model to evaluate efficiency of 34 Regional Public Hospitals. the proposed model is developed by adding Acceptance Region(AR). using analytical hierarchy process(AHP). this model is compared with those of typical DEA models. Financial data used in this study were obtained from Database of the Korea Association Regional Public Hospital and analyzed using DEA model. As a result of analysis, This study found that the DEA-AR/AHP Hybrid model was superior to those typical DEA models in determining the priority among efficient hospitals. the result of this study can provide helpful information to evaluate the efficiency of public hospitals for efficient operational management, to develop more precise measurement for the priority of the efficient hospitals.

IMF시대의 병원경영 전망과 대응전략

양동현,서영준,Yang, Dong-Hyeon,Seo, Yeong-Jun 대한병원협회 1998 대한병원협회지 Vol.27 No.3

화학축열을 통한 태양열 저장을 위한 메탄의 스팀개질 반응 특성

양동현(D.H.Yang),정찬화(C.H.Chung),한귀영(G.Y.Han),서태범(T.B.Seo),강용혁(Y.H.Kang) 한국태양에너지학회 2001 한국태양에너지학회 논문집 Vol.21 No.3

고온의 태양열을 저장학 위한 한 방편으로 화학반응을 이용한 태양에너지의 화학에너지로의 변환공정을 고려하였다. 태양에너지의 저장은 메탄의 수증기 개질반응으로 선정하였으며, 이 흡열반응에서 메탄의 전화율 특성을 살펴보았다. 반응기는 직경, 6.25mm, 그리고 길이 30cm인 stainless steel을 코일형태로 제작하였다. 반응온도 범위내에서 메탄의 전화율은 반응온도에 따라서 선형적으로 증가하였으며 반응온도 600℃ ~900℃ 범위에서 메탄의 전화율은 약 60% ~90% 로 측정되었다.이 실험을 통하여 태양열 저장을 위한 메탄의 수증기 개질반응의 타당성을 확인하였다. The chemical heat storage as the one way of utilization for high temperature solar energy was considered. The stram reforming reaction of methane was chosen for endothermic reaction. The reactor was made of stainless steel and the dimension was 6.25mm I.D. and 30cm long coiled tube because of the geometry requirement of solar receiver. The methane conversion was increased linearly with reaction temperature and nickel content of catalyst. The methane conversion was 60% at 6O0℃ and 90% at 9OO℃. The feasibility of steam reforming of methane as the conversion of solar energy to chemical heat storage was confirmed.

ISO 26262 기능안전 대응을 위해 FTA를 통한 효율적인 안전 분석 방법

양동현(Donghyun Yang),김수현(Suhyun Kim),김경훈(Kyounghoon Kim) 한국자동차공학회 2021 한국자동차공학회 부문종합 학술대회 Vol.2021 No.6

The recent rapid increase of electrical and/or electronic (E/E) controlled parts within road vehicles generated several risks such as failure modes caused by complex structures and high performance. In order to the risks from systematic failures and random hardware failures that may occur the electrical and/or electronic (E/E) systems within road vehicles, ISO26262 functional safety provides appropriate requirements and processes. In the performed safety activities during the safety life cycle, ISO26262 functional safety requires a qualitative safety analyses to identify the cause of failure and the effect of faults, and representative safety analysis methods include FMEA which is inductive analysis method and FTA which is deductive analysis method. In general, as a qualitative safety analysis method, FTA as highly recommendation is required when ASIL C or higher in ISO26262 functional safety, but it is necessary to perform FTA in ASIL A and ASIL B according to the functional safety requirements including DIA of each OEM. In this paper, the general architecture design structure and analysis method of fault propagation path cause are presented, and introduces an efficient safety analysis method through FTA to respond to ISO26262 functional safety based on the FTA methodology applying the P-S-C concept.

영동지방 강설량의 경년변화 특성 및 북태평양 SST와의 관계

양동현(Dong Hyun Yang),류찬수(Chan Su Ryu) 조선대학교 교과교육연구소 2001 교과교육연구 Vol.22 No.1

The characteristic of snowfall at Youngdong area is a key factor which determine the climatology of Korean peninsula. Although the location and characteristic of both cP and mT air-mass are an important factor which determine the snoefall, the Sea Surface Temperature(SST) of the North Pacific as a source of moisture can be a key factor too. To investigate the variation of snowfall at Youngdong area, therefore, we studied the intercorelation of variation between snowfall at Youngdong and SST at North Pacific. The period of dataset used in this study is for 18 years: from 1981 to 1998. The spatial distribution of SST at East-Sea depends on the movement of warm sea current caused by both Dongahn current and coastal current near Japan. According to this study, there were expanding of Siberia high pressure system toward both Younhaejoo and China, generation of mesoscale cyclone at Korean peninsula, and northerly wind which flow along coast line with partially north-easterly wind when there was a heavy snowfall at Youngdong area. This means that the high value of SST at Youngdong area during heavy snowfall dervie increasing of sensible heat flux over sea surface, increasing of easterly wind, and decreasing of air pressure. These processes were the main factors which played an important role for the increasing of moisture convergence and snowfall at Youngdong area. For the occurrence of heavy snowfall at Youngdong area, the following synoptic conditions are required: 1) The high pressure system of Siberia should be expanded toward Yonhaejoo, 2) development of cyclone over northern part of Korea, 3) there is a cyclone at East-Sea. In thoses synoptic condition, there are north-easterly wind influenced by strong sensible and latent heat fluxes from warm sea surface to the lower atmosphere. There heavy snowfall at Youngdong area can be expected in those situation.

확률변경모형(Stochastic Frontier Model)을 이용한 공공병원의 기술적 비효율성(Technical Inefficiency) 분석

양동현 ( Dong Hyun Yang ),장영재 ( Young Jae Jang ),노재확 ( Jae Whak Rho ) 한국보건경제정책학회(구 한국보건경제학회) 2012 보건경제와 정책연구 Vol.18 No.4

본 연구는 공공 의료기관인 지방의료원을 대상으로 2005년부터 2009년까지 5년간 32개 지방의료원의 운영실적자료를 이용하여 확률변경모형에 의해 효율성을 추정하고 시간적 흐름에 따라 지방의료원의 효율성 개선이 존재하는지를 확인하며, 지방의료원의 비효율성의 원인을 규명하는 데 연구의 목적을 두었다. 본 연구의 주요 연구결과를 정리하면 다음과 같다. 첫째, 공공병원인 지방의료원의 환자수를 의료활동의 최종 산출물로 인식할 때, 의료활동에 대한 생산함수 모형은 콥 더글러스(Cobb-Douglass)형 2변수 모형보다 트랜스로그(translog)형5변수 모형이 더 적합한 생산함수모형임을 확인하였다. 둘째, 기술적 비효율성이 확인 가능한, 입원환자의 경우 효율성이 지난 5년간 크게 개선이 된 것은 없다는 점이 밝혀졌다. 셋째, 병원의 입원환자 관련 효율성을 높이려면 잠재적 수요의 확장, 진료 능력의 향상 등이 요구됨이 증명되었다. 요약하면, 본 연구는 확률변경분석법에 의해 의료원의 기술비효율성이 존재하는 모형은 입원환자 모형임을 확인하였고, 지방의료원의 비효율성 개선이 시간에 따라 개선효과가 없으므로 의료원 자체의 내부경영개선 노력만으로 효율성을 개선시키는데 한계점이 있다는 것을 발견하였다. 따라서 지방의료원의 효율성 개선은 의료원의 병상을 얼마나 효율적으로 운영하느냐에 달려있으며 이를 위해 정부의 정책적 전환이 요구된다는 점을 확인하였다는 점에서 본 연구의 의미를 두고자 한다. This analysis studied on the technical inefficiencies of regional public hospitals using a stochastic production frontier model. For the empirical analysis the five year data from 2005 to 2009 of 32 regional public hospital data are used. The main focuses are given to reveal whether the technical inefficiency are improved as time goes by, and what is the prior causes of inefficiencies, if there exists. The results can be summarized as follows; First, the proper production model is the 5 elements translog production function rather than the simple labor and capital Cobb-Douglass production model. Second, the technical efficiency of in-patients has not being improved for the considered time of periods. Our findings have some policy implications. In case of in-patients, it is confirmed that there exists some inefficiencies, and those inefficiencies can not be overcome through just improving the inner management system. Rather than, the fact that the business environments which can be upgraded by the policy are needs to be improved is revealed.

공공병원의 생산성 변화와 결정요인 분석

양동현(Yang, Dong-Hyun),장영재(Chang, Young-Jae) 대한경영학회 2011 大韓經營學會誌 Vol.24 No.6

ISO 26262 기능안전 대응을 위한 종속 고장 분석 방법론

양동현(Donghyun Yang),김수현(Suhyun Kim),김윤탁(Yountak Kim),김경훈(Kyounghoon Kim) 한국자동차공학회 2022 한국자동차공학회 부문종합 학술대회 Vol.2022 No.6

The recent rapid increase of electrical and/or electronic (E/E) controlled parts within road vehicles generated several risks such as systematic failures and random hardware failures caused by complex structures and high performance. In order to avoid those risks, functional safety is one of the key issues in the development of road vehicles. Functional Safety represents the approach to reduce the risk of harm to people to an acceptable level and ISO 26262 standards are the functional safety related standards. ISO26262 standards provide the appropriate requirements and processes. As a part of the safety activities during the safety life cycle, ISO26262 standards require a dependent failure analysis to confirm the achievement the independence or freedom from interference and to mitigate the plausible dependent failures. In this paper, the identification method of dependent failures and the analysis method fault propagation path cause are presented and introduces an efficient dependent failure analysis method to respond to ISO26262 standards.

모수적·비모수적 기법을 활용한 베트남 공공종합병원의 규모수익과 생산효율성 변화 분석

양동현(Yang, Dong-Hyun) 한국산학기술학회 2014 한국산학기술학회논문지 Vol.15 No.2

본 연구는 베트남 호치민시 보건부 데이터베이스에서 추출한 20개 공공종합병원의 2006년부터 2010년까지 5 년간 패널자료를 이용하여 비모수적 기법과 모수적 기법을 활용하여 규모수익과 생산성 변화를 측정하였다. 그 결과 를 요약하면 다음과 같다. 첫째, 비모수 기법으로 측정된 생산성 증가율은 5년간 누적 증가율이 2.8%이며 이는 5.8% 의 기술효율성 증가와 기술효율성 개선에 기인하고 있다. 반면 규모효율성은 5.2% 감소하고 있다. 둘째, 모수적 기법 으로 측정한 생산성은 17.1% 감소를 보였으며 이는 17.1%의 기술 퇴보와 9.1%의 규모효율성 감소에 기인하고 있다. 두 기법에서의 공통적인 점은 베트남 공공종합병원에서 규모의 비효율성이 발생하고 있으며 규모의 비효율성 변화가 생산성 변화에 중요한 영향을 미치고 있었다. 즉 베트남 공공종합병원은 분석표본의 70%∼80%가 규모의 체증상태에 있으며 이는 환자 수에 비해 공공병원의 규모가 과잉공급 상태에 있음을 시사하고 있다. 이 연구는 베트남 공공병원 의 효율성과 생산성 변화를 측정한 국내 첫 연구이며 향후 베트남 병원산업 진출을 위한 기초 정보로 활용될 수 있 다는 점에서 의미가 있다. This study estimated productivity change and RTS using Parametric and Non-Parametric approach with 5 year annual data from 2006 to 2010 of 20 public general hospitals in Vietnam collected from Ho Chi Min City Health Department of Health Database. The results could be summarized as follows; First, by the Non-Parametric approach. cumulated productivity growth of 5 years was increased by 2.8% due to regress 5.2% of technical efficiency, 0.3% of pure technical efficiency, but scale efficiency was decreased 5.1% Second, by the Non-Parametric approach, cumulated productivity growth was decreased by 12.8% to due to drop of 17.1% of technical change, 9.1% of scale efficiency. In conclusion, the common result of both approaches was that scale inefficiencies occurs in public hospitals in Vietnam, and they affected productivity change of public hospitals in Vietnam. Namely, 70% to 80% of the analyzed Vietnam public hospitals were at the status of DRS(decreased returns to scale), which suggested that they had oversupply beds relative to the number of occupied patients, it was meaningful that this study was the first study in Korea to measure efficiency and productivity change of Vietnamese public general hospitals and so it could be utilized as the basic information needed to enter hospital industry of Vietnam in the future

3 차병원의 생산 효율성 측정 및 결정요인 분석

양동현(Dong Hyun Yang),서원식(Won Sik Suh),박광훈(Kwang Hoon Park) 한국병원경영학회 1997 병원경영학회지 Vol.2 No.1