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

메타프론티어 맘퀴스트 생산성 지수를 이용한 상급종합병원과 대형종합병원의 생산성 변화 비교

양동현(Dong-Hyun Yang),장영재(Young-Jae Chang) 한국산업경제학회 2013 산업경제연구 Vol.26 No.6

본 연구는 2007년부터 2011년까지 5년 간 대한병원협회의 수련병원 경영실적자료를 이용하여 상급종합병원그룹과 대형종합병원그룹의 확률변경생산함수와 메타확률변경함수를 추정하여 그룹기술효율성과 메타효율성, 메타프론티어 맘퀴스트 생산성 지수를 측정하였으며 상급종합병원과 종합병원 간 기술격차, 규모수익, 그리고 생산성 변화를 비교분석하였다. 본 연구의 분석결과와 시사점을 정리하면 다음과 같다. 본 연구의 결과에서 상급종합병원은 대형종합병원에 비해 기술효율성과 기술격차는 선도적인 입장에 있으나 규모의 비효율성이 대형종합병원에 상대적으로 높으며 규모의 비효율성이 증가하고 있다. 상급종합병원은 규모의 비효율성이 증가함에도 불구하고 상급종합병원들은 지속적인 분원신축과 병상증설이 이루어지고 있다. 이로 인해 종합병원 간 과당 경쟁으로 의료시장의 왜곡이 더욱 심화되고 있다. 따라서 의료기관의 종별 기능을 제도화하고 상급종합병원의 병상증설과 병원신축을 억제함으로써 의료기관 종별로 환자분산을 통하여 균형 있는 병원산업으로 발전하여야 할 것이다 This study measured group technical efficiencies, meta technical efficiencies, and meta productivity indices with stochastic frontier production function and meta stochastic frontier functions for advanced general hospitals and large general hospitals of Korea using annual data from 2007 to 2011 of management performance collected by Korean Hospital Association and then analyzed technology gap ratio, returns to scale, and productivity changes. We found that advanced general hospitals were superior to large general hospitals in terms of technical efficiencies and technology gap ratios but their scale inefficiencies were increasing sharply. In the spite of the rising scale inefficiencies, advanced general hospitals built branches and increased hospital beds. The resulting overcompetition among advanced general and general hospitals distorted domestic medical service market further. For a balanced growth of Korean hospital industry with inducing patients to diversely consume general hospitals in terms of function and region, a policy of reorganization of general hospitals and constrain of both the construction of new general hospitals and the expansion of existing ones was necessary.

Mortierella isabellina IFO 8183에 의한 γ-Linolenic Acid 생산

양동현(Dong-Hyun Yang),남희섭(Hee-Sop Nam),이상협(Sang-Hyub Lee),방원기(Won-Gi Bang) 한국식품과학회 1989 한국식품과학회지 Vol.21 No.6

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

광통신망의 진화동향

양동현(Dong-Hyun Yang),한종기(Jong-Ki Han),이경근(Kyung Geun Lee) 한국통신학회 2001 한국통신학회 학술대회논문집 Vol.2001 No.11

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.

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.

초효율성 모형을 이용한 지방의료원의 환경요인별 효율성 차이 분석

양동현(Donghyun yang) 한국콘텐츠학회 2012 한국콘텐츠학회논문지 Vol.12 No.7

본 연구는 전국지방의료원연합회에서 발간하고 있는 경영평가통계편람에서 2005년부터 2009년까지 지방의료원의 운영실적자료를 이용하여 DEA의 CCR 모형, AP모형, superSBM 모형의 각 효율성을 측정하여 비교·분석하였다. 그리고 환경요인(지역, 종별형태, 운영형태, 교육수련여부, 수요와 공급여건, 의료급여 환자비율)별 superSBM 모형의 효율성의 차이를 확인하기 위하여 Willcoxon- Mann- Whitney 통계량을 이용하여 분석하였다. 분석결과, 첫째, SuperSBM 모형에서 15%∼17.1%, CCR 모형에서 13%∼15.5%, AP 모형에서 7%∼12.6%의 비효율을 보여 주고 있다. 둘째, 지역, 병원종별 형태, 병원운영형태, 수요와 공급여건, 저소득층의 진료비 비중 등 환경적 요인에 따라 효율성의 차이가 발생하였다. 셋째, 환경요인에 의해 발생되는 비효율을 해소하기 위해서는 병원내부의 독자적인 노력만으로 한계가 있으며 정부와 지방자치단체의 정책과 제도의 개선이 뒷받침되어야 한다. In the study, we estimate efficiencies using CCR model of DEA, Super efficiency(AP) model, and super-SBM model with the data of 32 regional public hospitals in Korea from 205 to 2009. With Wilcoxon-Mann-Whitney statistics, we analyze efficiency differences for environmental factors(regions, type of hospital, type of operations, type of education training, relative importanceof madicaids) among regional public hospitals. The results can be summarized as follows. Firstly, technical inefficiencies of regional public hospitals range from 15% to 17% in CCR model, 13% to 15% in AP model, 7% to 12.6% in SuperSBM model. Second, we confirm that environmental factors of hospitals cause different inefficiencies among them. The implication of this study is that policy and institutional change may need to improve the efficiencies along with internal managerial reform.

ISO 26262표준 대응을 위해 FTA를 이용한 소프트웨어 안전 분석 적용 방안

양동현(Donghyun Yang),김경훈(Kyounghoon Kim),정유진(Youjin Jeong) 한국자동차공학회 2023 한국자동차공학회 부문종합 학술대회 Vol.2023 No.5

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 ISO26262 standards are the functional safety related standards. ISO26262 standards provide the appropriate requirements and processes. As a part of the safety activities during the functional safety life cycle, ISO26262 standards require a software safety analysis at the architectural design level to identify the cause of failure and the effect of faults regardless of ASIL. The representative method for the safety analysis includes FMEA which is inductive analysis method and FTA which is deductive analysis method. In this paper, the general architecture design structure and analysis method of fault propagation path cause is presented and introduces an efficient software safety analysis method using the FTA to comply with the ISO26262 standards.