• 한국경영과학회지
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• 제35권3호
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• pp.59-68
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• 2010

Improving productive efficiency is important for strengthening a competitiveness of coastal fisheries. This paper examines the productive efficiency of a sample of coastal gillnet fishing business units by estimating a stochastic frontier analysis (SFA) and a data envelopment analysis (DEA) approaches and compares those estimates obtained from two approaches. The estimated mean productive efficiency by SFA is 77.6% and the mean productive efficiencies obtained for the VRS and CRS DEA are 75.9% and 45.7%, respectively. The joint use of SFA and DEA for estimating efficiency is also discussed.

• 수산경영론집
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• 제43권2호
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• pp.67-77
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• 2012

Based on the survey on aquaculture management status in Nohwa-eup, Bogil-myeon, Wando-eup in Wando region, this study aimed to estimate productive efficiencies of abalone aquaculture production using a stochastic frontier approach (SFA) and to find out their determinants. In the analysis, a Cobb-Douglas production function with an inefficiency term that follows an halfnormal distribution was assumed for the estimation of productive efficiencies. Then, based on the outcomes of productive efficiencies, determinants of productive efficiency were investigated using a tobit regression model. Results showed that the average inefficiency was estimated to be 10% and the production size would be a statistically significant variable for the production. In addition, it was shown that the cage installing method would be an important factor affecting to the level of productive efficiency.

• 한국항만경제학회지
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• 제18권1호
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• pp.3-26
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• 2002

The purpose of this paper is to Investigate the productive efficiency and competitive strength of world container ports using the DEA, Super-efficiency, and FDH methods with the raw data from previous research by Jun et al.(1993). The super-efficiency measure examines the maximal radial change In input, outputs for an observation to remain efficient. Therefore, it provides a means of distinguishing between efficient observations, which would otherwise seem identical. FDH provides a good test mechanism for examining the practical implications of the choice available among alternative efficiency measures and orientations, because of the lack of convexity of its production possibility set. Both methods are complementary to DEA. This paper follows the traditional productivity analysis method overcoming the limitation of previous studies by using the DEA, FDH and Super-efficiency methods, and proposing in measure the relative competitive strength of worldwide container ports. The main empirical results of this paper are as follows: Firstly the ports of Singapore, Hongkong, Kilrung, Busan, Tokyo. and Longbeach were found to be efficient In the CCR model. The ports of Felixstowe, Bangkok, Singapore, Hongkong, Kilung, Busan, Tokyo, and Longbeach were found to be efficient in the BCC model. Secondly, super. efficiency rankings under CRS and input-oriented model are as follows: Longbeach, Keelung, Singapore, Busan, Tokyo, and Honkong. However, it was difficult In differenciate the rankings under the VRS and input-oriented model. due to major difficulties posed by the ports of Singapore, Hongkong, and Longbeach. Thirdly, the FDH method shows that the inefficient ports are Bremerhaven, Antwerp, Le Havre, Kobe, Seattle, New York The policy Implications of this study are as follows: Firstly, when port authorities want to measure the international competitive strength of container ports and enhance their productive efficiency, they should consider the traditional method as well as introducing the Super-efficiency and FDH methods. Secondly, according to the analysis results of the super-efficiency and FDH methods, poll authorities should recommend benchmarks ports and dominated ports as reference ports in order to enhance the productive efficiency of their container ports that have an efficiency rating of less than 1. Efficient ports whose efficiency ratings are over 1 in the Input-oriented Super-efficiency model should also consider the usage of input and output elements used by more efficient ports.

• 보건행정학회지
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• 제9권4호
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• pp.87-119
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• 1999

The main purpose of this research is to measure and analyze how productive the health centers are and how much inputs(or outputs) in the inefficient health centers should be decreased(or increased) for efficiency. The evaluation of the performance of health centers gives a strong incentive to improve resource allocation in regional health planning. It has been, however, implemented very rarely until now. In this regard, this paper measures the performance of the health centers with a single indicator for multiple-outputs in terms of productivity(technical efficiency), based on Data Envelopment method. The 20 Kyungnam health centers which provide clinic services and specific primary health care services were analyzed. The results show that 50.0% of 20 health centers were productive with respective to overall technical efficiency, 65.0% were productive for pure technical efficiency, and 50.0% for scale efficiency. The inefficient group includes Geoje, Mahsan, Miryang, Sahchun, Tongyoung, Gosung, Nahmhae, Euryang, Hahmahn, Hahbchun health centers. The worst case was identified as Tongyoung health center which represented a 47.5% efficiency, compared with productive health centers. The empirical results for input-output analysis indicates that the low-productive health centers have excessive manpower in administration department, producing low outputs in clinical services and vaccination program. These findings imply that a systemic evaluation of the performance of the Korean health centers and the subsequent structural reform are strongly required.

• 한국항만경제학회지
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• 제17권1호
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• pp.27-51
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• 2001

The purpose of this paper is to investigate the productive efficiency of world container ports by using the DEA (Data Envelopment Analysis) method and raw data from previous research in measuring the international competitiveness of world container ports. Ports have to cope with rapid changes in shipping environments. In order for a port to compete in the global market, it must provide port services promptly and accurately. Basically, there are two approaches to measuring the international competitiveness of a container port. First, there is the traditional productivity analysis method, which analyzes productivity based on the container port's facilities (efficiency, selectivity, land availability), and by its general capacity (handling ability, storage capacity, terminal productivity). Second there is multi-attribute utility analysis, which considers several elements including the reasons for selecting particular container ports and factors determining international competitiveness. This paper follows the first method (traditional productivity analysis) and extends the limitation of previous studies by using the DEA method newly, and suggesting: the relative productive efficiency of container ports. The main results of this paper are as follows: First, the results of the DEA analysis in terms of world container ports matches that of a previous study (Jun et al., 1993) at a level of 35%. The low ratio is due to the constrained set of input-output elements, the result of only twenty container ports being analyzed in this paper. Second, the result of the DEA analysis in terms of North-East Asia's container ports matches with that of a previous study (Ha, 1996) at a level of 100 percent. Therefore we can conclude that the DEA analysis is the best measurement method for international competitiveness. Policy implications for this study are as follows: First, when port authorities want to measure the international competition power of container ports and enhance their productive efficiency, they should consider the traditional method and newly introduce the DEA method. Second, according to the analysis results of the DEA method, pen authorities should recommend benchmarking ports as reference ports in order to enhance the productive efficiency of container ports that show an efficiency score of below 1.

• 한국철도학회논문집
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• 제12권6호
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• pp.1030-1036
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• 2009

본 연구에서는 철도산업의 효율성을 측정하는데 있어 내부요인인 운영기관의 생산활동 뿐만 아니라 구조개혁으로 인한 조직유형, 사회경제적 관점에서 통제 불가능한 환경요인 등이 철도산업 효율성을 결정짓는데 어떠한 영향을 미치는지 분석하였다. 우리나라를 비롯하여 1990년 이후 구조개혁이 활발히 진행된 유럽국가와 일본을 대상으로, 철도산업 효율성 측정에 적합한 DEA방법을 이용하여 1990년~2006년까지의 효율성 값을 구하였다. 그 결과 우리나라는 모든 연도에 걸쳐 상대적으로 효율적으로 추정되었고, 전반적으로 평가대상국들의 효율성이 시간이 지남에 따라 향상되었음을 나타내었다. 또한 효율성 결정요인을 분석하고자 DEA방법으로 추정된 효율성 값을 종속변수로 하고, 구조개혁으로 인한 조직유형, 사회경제적 환경요인을 독립변수로 한 Tobit 분석에서는 시설과 운영을 분리하는 수직적 분리와 화물과 여객을 분리하는 수평적 분리가 효율성에 긍정적인 영향을 미치는 것으로 나타났다. 이는 철도산업의 경쟁력 강화와 경영효율성을 제고하기 위한 구조개혁은 그 과정과 결과에 대한 신중한 검토 및 평가가 이루어져야 함을 시사하였다.

• 한국항해항만학회지
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• 제32권1호
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• pp.73-80
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• 2008

본 연구의 목적은 DEA를 사용하여 지방해양수산청의 생산효율성과 경쟁력을 측정하고자 하는 것이다. 선형문제 분석기 EMS를 사용하여 기술적 효율성 프론티어로 부터 한 방향 또는 다른 방향의 거리를 측정한다. 투입지향 측정은 산출 요소를 유지한 상태에서 효율성을 위한 투입요소의 감소치를 측정한다. 이와 같이 산출지향 측정은 입력 요소를 유지한 상태에서 효율성에 필요한 산출수치를 측정하고 무지향 측정은 효율성 개선을 위하여 투입과 산출에 대해 양방향으로 필요한 수치를 측정한다. DEA를 사용한 분석결과에 따라 비효율적 지방해양수산청은 항만행정과 공공기관의 생산 효율성을 강화하기 위하여 상대적으로 효율적인 지방해양수산청을 벤치마킹할 것이 권고된다. 생산효율성에 관한 자료는 모든 활용영역에서 정책 입안자에게 방법론을 제공하고 다양한 체제에서 운용할 수 있는 기초가 될 것이다.

• 한국산학기술학회논문지
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• 제16권12호
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• pp.8719-8727
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• 2015

본 연구는 장미농가의 생산효율성을 측정하고, 경영의 비효율성에 영향을 미치는 요인을 파악하기 위한 연구이다. SFA(Stochastic Frontier Analysis) 기법과 DEA(Data Envelopment Analysis) 기법을 사용하여 생산효율성을 측정하였으며, 효율성에 영향을 미치는 요인을 분석하기 위하여 Tobit 회귀 분석을 실시하였다. 먼저, SFA 방법을 통한 생산효율성은 88.4%으로 측정되었으며, DEA 방법에서 불변규모수익(CRS) 모형과 변동수익규모(VRS) 모형을 통해서는 생산효율성이 각각 78.5%와 85.2%로 측정되었다. 특히 두 가지 방법의 생산효율성 측정결과는 각 경영체의 효율성 순위를 동일하게 설명하고 있어 상호보완적이다. 다음으로 Tobit 분석 결과, 투입한 6개의 변수가 모두 효율성에 영향을 미치는 것으로 나타났으며, 종묘비와 제재료비는 (+) 부호를 나타냄과 동시에 회귀계수가 가장 크게 나타나 효율성에 미치는 영향력이 가장 큰 경영 항목으로 분석되었다. 이러한 결과는 장미농가는 종묘비와 제재료비의 투입을 증대시켜 더욱 높은 소득을 창출하는 방식으로 경영 효율성을 증대시켜야 함을 시사한다.

• 자원ㆍ환경경제연구
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• 제17권1호
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• pp.121-146
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• 2008

본 연구의 목적은 OECD 국가의 환경제약을 포함한 기술효율과 생산성 상실을 추정하여 환경효율지수를 실증분석하고 국가별 지속가능 발전 정도를 비교해 보고자 함이다. 1985년부터 1999년까지의 기간 동안 OECD 20개국의 패널자료를 사용하여 쌍곡선효율척도(hyperbolic measure of productive efficiency)에 기초한 기술효율을 측정하였다. 나아가 각 국가의 환경제약으로 인한 생산성 상실률과 산출에 대한 상실정도를 계측하였다. 1985년부터 1999년 동안 OECD 각 국가들의 환경효율지수는 점차 하락하고 있는 추세를 보여준다. 일본, 독일, 프랑스 등의 국가에서 오염물 처리에 상당한 부담을 가지고 있는 것으로 나타났다. 한국은 전반적으로 환경경제효율성이 높지만 1990년대 후반에 환경효율성이 악화되었고 OECD 국가들과 비슷하게 질소산화물 처리에 대한 부담이 높았다.

• Animal Bioscience
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• 제36권7호
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• pp.1067-1074
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• 2023

Objective: Better feed efficiency can be achieved by selecting rabbit genotypes with lower residual feed intake (RFI) under high ambient temperatures. Methods: Two genotypes of rabbits (Jabali, Saudi local breed and imported, Spanish V-line) were used to derive RFI and to investigate the relationship between RFI and productive traits. In total, 250 animals (125 each) were housed in individual wire mesh cages in a semi-closed rabbitry. Growth performance, feed criteria, carcass evaluation, biochemical blood analysis, and immune responses were determined. Results: Superiority in growth performance, feed efficiency, carcass characteristics, and cellular immunity was recorded in the Jabali breed compared to the V-line genotype. According to regression analysis, a significant effect of daily body weight gain was found, upon computing the expected feed intake in both genotypes. Moreover, mid-body weight^0.75 had a significant effect only in the Jabali breed. Positive correlation coefficients between RFI and dry matter feed intake or feed conversion ratio were found. The same trend in this relationship between RFI and productive traits was observed in some cases for both genotypes. An opposite trend in correlations was observed in the studied genotypes for some traits. Conclusion: The results suggest that the relationship between RFI and productive traits must be taken into consideration in rabbit breeding programs under the prevailing environment. However, further studies are required to investigate the effect of rabbit genotype and environmental factors on computing RFI.