A Non-Oriented DEA Game Cross Efficiency Model for Supplier Selection

임성묵 한국산업경영시스템학회 2015 한국산업경영시스템학회지 Vol.38 No.2

This study intends to propose a non-oriented DEA based game cross-efficiency approach for supplier selection. With a discussion on the choice of DEA models and approaches that are most appropriate for supplier selection, we propose a game cross efficiency model based upon the non-oriented variable returns-to-scale RAM DEA by adapting the existing game cross efficiency model based upon the oriented constant returns-to-scale CCR DEA. We develop the RAM game cross efficiency model and a convergent iterative solution procedure to find the best game cross efficiency scores that constitute a Nash equilibrium. We illustrate the proposed model with two data sets of supplier selection, and demonstrate that significantly different results are obtained when compared with the existing approaches.

치과위생사의 비외과적 치주처치 업무에 대한 치과위생사와 치과의사의 인식 차이 비교 : 상호지향성 모델을 중심으로

문상은,홍선화,김윤정,김선영,조혜은,강현주,천혜원,김경선,장선옥,오혜영,문소정 한국치위생학회 2020 한국치위생학회지 Vol.20 No.1

Objectives: This study applied the co-orientation model to investigate the degree to which dental hygienists and dentists recognize the efficiency of dental hygienists’ non-surgical periodontal therapy work, the basic data can be provided as a systematic arrangement that can be applied and extended to dental clinics to raise mutual understanding. Methods: Independent sample t-tests, one-way ANOVA, and paired t-tests were conducted with a total of 888 subjects (530 dental hygienists and 358 dentists) using SPSS Statistics 22.0. Results: The analysis showed that, dental hygienists had higher recognition of the efficiency of their work (p<0.001) than dentists, with respect to all items(p>0.05). With respect to subjective agreement, dental hygienists estimated lower recognition among dentists than other dental hygienists and dentists estimated higher recognition among dentists than dental hygienists. With respect to accuracy, dentists’ estimation was lower than the actual recognition among dental hygienists and dental hygienists’ estimation was higher than the actual recognition among dentists in all cases except the efficiency of dental hygienists’ patient education work and constant learning. Conclusions: There was wide gap between dental hygienists and dentists in recognition of the efficiency of dental hygienists’ non-surgical periodontal therapy work. Actions must be taken to raise mutual understanding between dental hygienists and dentists regarding dental hygienists’ no-surgical periodontal therapy work, to spread this recognition throughout the dental industry, and to implement systematic support at dental clinics.

지방공기업의 효율성에 대한 통합운영의 효과 평가: 비소망산출물모형을 이용한 부트스트랩 단절회귀분석

유금록 한국정책분석평가학회 2019 政策分析評價學會報 Vol.29 No.1

This article measured the operational efficiency, scale efficiency, and returns to scale of 29 local public sewerage enterprises directly managed by Gyeonggi provincial government in 2014 with a non-oriented VRS non-radial undesirable outputs model, analyzed the effect of integrated management on the operational efficiency using a bootstrapped truncated regression, and then suggested academic and policy implications. Analytic results are summarized as follows. First, there exist large differences among inefficient sewerage enterprises. Second, two public sewerage enterprises operate in the area of decreasing returns to scale, while seven sewerage enterprises work in the region of constant returns to scale, and 21 sewerage ones run in the range of increasing returns to scale. Third, the unified operation of sewerage and water services improves the efficiency of sewerage enterprises. Fourth, the efficiency of sewerage enterprises managed by city is very higher than that of those managed by county. Finally, the efficiency of united sewerage enterprises managed by city is considerably higher than that of unconsolidated ones. 본 연구는 비방사적 비소망산출물모형을 사용하여 경기도 29개 하수도공기업의 운영효율성과 규모효율성, 규모수익(RTS)을 측정하고 통합운영이 효율성에 미치는 효과를 부트스트랩 단절회귀분석을 사용하여 분석한 후, 학술적·정책적 시사점을 제시하였다. 하수도공기업의 효율성을 분석한 결과는 다음과 같다. 첫째, 비효율적인 하수도공기업들 간에 효율성의 차이가 크다. 둘째, 2개의 하수도공기업이 규모에 대한 수익체감(DRS) 영역에서 운영되는 반면 7개 하수도공기업은 규모에 대한 수익불변(CRS) 영역에서 그리고 21개 하수도공기업은 규모에 대한 수익체증(IRS) 영역에서 운영되고 있다. 셋째, 하수도공기업과 상수도공기업의 통합운영이 하수도공기업의 효율성을 높인다. 넷째, 시 소속 하수도공기업의 효율성이 군 소속 하수도공기업의 효율성보다 높다. 마지막으로 일반시 소속 통합 하수도공기업의 효율성이 미통합 하수도공기업의 효율성보다 더 높다.

비정형 건축에 있어서 BIM(Building Information Modeling)의 적용방안에 관한 연구

박정근(Park Jung-Geun),이명식(Lee Myung-Sik) 대한건축학회 2008 대한건축학회 학술발표대회 논문집 - 계획계/구조계 Vol.28 No.1(계획계)

In the contemporary architecture, non-linear forms architecture that utilizes digital media possesses the potential of extracting creative architectural designs, but it poses a substantial level of technical difficulty ranging from initial design to actual construction due to its configurational characteristics. The objective of this study is to explore the possibility of solving the difficulties involved with the non-linear forms architectural construction through incorporating BIM(Building Information Modeling), which utilizes engineering modeler based on NURBS(non-uniform rational B'-spline) over the entire life of non-linear forms architectural construction project, and also possibility from the system aspect in the construction processes. The conclusions obtained in this study are as following. Firstly, expression and modeling with a wide range of freedom would become feasible in non-linear forms architectural forms. Secondly, in construction business processes, 3D-Based and Object-Oriented trends would be newly established. Thirdly, standardization and collaborative network would become possible. Fourthly, exchange and sharing of data would be proposed as an integration project delivery.

지방공기업의 효율성 및 규모수익 평가: 지방하수도공기업에 대한 방향거리함수모형의 적용

유금록 서울대학교 한국행정연구소 2012 行政論叢 Vol.50 No.1

This study analyzed the operational efficiency, input inefficiency, output inefficiency, and returns to scale of local public enterprises at sixty-nine local sewage utilities in local Korean governments using a non-oriented variable returns to scale directional distance function model that maximizes outputs and minimizes inputs. The results of the analysis show that the mean, standard deviation, maximum, and minimum of the sixty-nine sewage utilities are 77.08%, 24.08%, 100%, and 33.33%, respectively. The empirical results of the inputs and outputs inefficiencies indicate that most of the inefficiencies of sewage utilities are due to inputs rather than outputs. The results of the scale efficiency analysis show that most sewage utilities do not operate at optimal levels. The results of the analysis of the returns to scale of sewage utilities with an inefficient scale of operations reveal that twelve sewage utilities operate with increasing returns to scale, while forty-five operate with decreasing returns to scale. These results imply that sewage utilities operating with increasing returns to scale need to be expanded, while those operating with decreasing returns to scale should be reduced. 본 연구에서는 투입요소를 최소화하는 동시에 산출물을 최대화하는 투입산출지향적(non- oriented) 규모수익가변(VRS) 방향거리함수모형(directional distance function model)을 사용하여 우리나라 기초자치단체의 69개 지방하수도공기업을 중심으로 지방공기업의 운영효율성과 투입비효율성, 산출비효율성, 규모수익을 분석했다. 지방하수도공기업의 효율성을 분석한 결과, 69개 하수도공기업의 투입산출지향적 효율성점수의 평균과 표준편차, 최대치, 최소치는 각각 77.08%, 24.08%, 100%, 33.33%로 나타났다. 투입요소와 산출물의 비효율성을 분석한 결과, 하수도공기업의 비효율성이 거의 대부분 산출물보다는 투입요소에서 발생하는 것으로 나타났다. 하수도공기업의 규모효율성을 분석한 결과, 하수도공기업의 대부분이 최적규모에서 운영되지 않고 있는 것으로 나타났다. 비효율적으로 운영되고 있는 하수도공기업의 규모수익을 분석한 결과, 12개 하수도공기업이 규모수익체증(IRS) 영역에서 운영되고 있는 데 비해 45개 하수도공기업은 규모수익체감(DRS) 영역에서 운영되고 있는 것으로 나타났다. 따라서 규모수익체증 영역에서 운영되고 있는 하수도공기업의 운영규모를 확대하는 한편 규모수익체감 영역에서 운영되고 있는 하수도공기업의 운영규모를 축소해야 할 것이다.

Bootstrapped Malmquist 지수를 이용한 국내 의약품산업의 생산성 변화 요인 분석에 관한 연구

소순후 대한경영정보학회 2016 경영과 정보연구 Vol.35 No.4

본 연구는 Bootstrapped Malmquist 지수를 이용하여 국내 의약품산업의 생산성 변화 추이를 측정하고 이러한 변화를 기술효율성 변화와 기술변화 요인으로 분해함으로써 의약품산업의 생산효율성을 제고하기 위한 시사점을 제시하고자 한다. 특히 기존의 연구들과 달리 투입 및 산출요소의 여분을 반영하여 투입최소화와 산출최대화를 측정할 수 있는 투입산출지향 비방사적 Malmquist 지수를 분석에 활용한다. 또한 평활부트스트랩 방법을 적용하여 Malmquist 지수와 그 구성요인의 통계적 신뢰구간을 추정한다. 실증분석을 위해 2005년에서 2014년까지 10개년의 균형패널자료를 수집하였으며, 분석에 사용된 투입요소는 종사자수, 유형자산, 주요생산비를 선정하였고, 생산액을 산출요소로 사용하였다. 분석 결과, 의약품산업의 생산성은 분석기간 동안 하락한 것으로 나타났으며, 이러한 생산성 하락은 기술진보의 둔화에 기인한 것으로 나타났다. 또한 의약품산업의 기술적 효율성은 순수효율성보다는 규모효율성에 보다 많은 영향을 받은 것으로 분석되었다. 따라서 향후 의약품산업의 경쟁력 강화를 위해서는 효율적 R&D 투자와 산업구조의 선진화를 통해 기술혁신역량을 강화하는 정책적 지원이 요구된다. This study estimates the productivity change of pharmaceutical industry and decompose the change into technical efficiency change and technological change to explore ways to improve the productive efficiency. Unlike most previous studies, this study employs the non-radial and non-oriented slacks-based Malmquist productivity index which can deals directly with the input excesses and output shortfalls. In addition a smoothed bootstrap method is applied to estimate statistical confidence intervals for the Malmquist Index and its components. For the empirical analysis a balanced panel data set is constructed covering ten years over the period from 2005 to 2014. The input variables used in this study are number of workers, tangible assets and major production cost. The gross production is selected as a main output variable. The empirical results suggest that the productivity of pharmaceutical industry has decreased due mainly to decline in the technological progress rather than improvements in technical efficiency. An analysis result shows that the scale efficiency outweighs the pure efficiency in determining the technical efficiency of pharmaceutical industry. Therefore, in order to enhance the competitiveness of domestic pharmaceutical industry, it is important to continue supporting policies to promote the technology innovation capability through efficient R&D investment and industry reform strategy.