• Proceedings of the Korean Information Science Society Conference
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• 2000.04a
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• pp.193-195
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• 2000

컴퓨터 하드웨어의 빠른 개발 주기에 맞춰 저 가격, 고 효율성, 높은 신뢰성, 호환성 등의 장점을 가진 PC가 현대의 컴퓨터 흐름을 주도하게 되었다. 이에, 산업분야 전반에 걸친 컴퓨터 적용이 증가는 많은 발전과 변화를 가져왔다. 특히, 자동화 시스템분야에서 그 효과가 두드러졌는데 이는 고 가격, 긴 개발기간 등을 필요로 했던 과거와 달리 저 가격, 짧은 개발기간, 다양한 개발환경 등을 이룰 수 있었다. 또한, 생산량 증가에만 의존하던 과거의 자동화 시스템은 현대에 이르러 시스템의 최적화, 효율의 극대화, 시스템의 안정성, 운용의 편리성, 호환성 등의 개념들이 도입되고 있다. 특히, 시스템의 생산성을 높이려는 노력도 많이 이루어지고 개발되었는데, 이를 위해서 시스템의 효율성은 그 기준이 되는 필수적인 요소가 되었다. 자동화 시스템에서 효율성을 평가하는 기법을 여러 가지가 있다. 그중 생산성과 직접 관계되는 효율 데이터는 UPEH(Unit per hour)를 들 수 있다. 따라서, 본 논문에서는 이러한 효율성에 관련하여 그 기준이 되는 생산 데이터에 대한 시스템 효율성을 자동으로 산출하며, 이를 사용자에게 제공함으로써 보다 정량화 되고 객관적인 평가 자료가 되도록 하였다. 본 논문이 적용된 자동화 시스템은 제어부 시스템과 GUI 시스템으로 나뉘어지는데 효율 데이터의 산출 및 관리는 GUI 시스템에서 담당하였다. 또한, 이를 위하여 Windows 98 운영체제를 사용하였다.

• Proceedings of the Korean Information Science Society Conference
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• 1998.10b
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• pp.54-56
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• 1998

동시에 다수의 사용자가 빠른 속도로 이미지 검색이 가능하도록 지원해주는 고차원 색인구조에 대한 효율적인 동시성 제어 방법은 매우 중요하지만 이에 대한 연구는 부족한 실정이다. 기존에 제안된 방법인 RLINK-트리는 링크를 적용시켜 다른 기법들에 비해 향상된 효율을 갖고 있지만 고차원 색인구조에 적용할 경우에는 문제가 발생한다. RLINK-트리에서는 고차원 색인구조의 효율적인 구성을 위한 재삽입 연산에 대한 동시성 제어를 고려하지 않고 있으며, 트리의 일관성을 유지하기 위해서 동시성 효율이 낮은 잠금 결합 방법을 사용하기 때문에 고차원 색인구조의 동시성 제어 기법에 그대로 적용하기에는 한계가 있다. 따라서, 본 논문에서는 고차원 색인구조의 효율적인 트리구성을 위해 수행되는 재삽입의 동시성 문제를 해결하면서 동시성 수준을 향상시킨 새로운 동시성 제어 알로리즘을 제안하고, 제안된 알로리즘을 고차원 색인구조에 적용시켜 동시성 제어가 효율적으로 제공될 수 있음을 증명한다.

• Journal of Korean Society of Forest Science
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• v.103 no.4
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• pp.639-645
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• 2014

This study was conducted to evaluate the management efficiency of oak mushroom farms in Korea using the Data Envelopment Analysis (DEA), which is one of the non-parametric estimation methods. The data that was analyzed in this study was from the result of 2013 survey entitled "Standard Diagnostic Table for Oak Mushroom Management", which was conducted from March 2012 to October 2012. This survey was based on the inputs and outputs of 20 oak mushroom farms. Specifically, this study analyzed the technical efficiency, pure-technical efficiency and scale efficiency using CCR and BCC model of the DEA methods. Furthermore, this study compares the management efficiency between the full time oak mushroom production farms and part time oak mushroom production farms. Results showed that mean value for the technical efficiency was 0.655 which is considered as inefficient in general. For the pure-technical efficiency and scale efficiency, the mean values were 0.830 and 0.747, respectively which showed that inefficiency in the management was observed in the mushroom farms. Results also showed that there were seven farms with a total efficiency of 1, namely Decision Making Unit(DMU)2, DMU5, DMU6, DMU8, DMU10, DMU15 and DMU20. The management efficiency of DMU7 specifically the inputs for production was analyzed and compared to DMU5 and DMU6 and results showed that the DMU7 had an excessive inoculation and site development cost. Lastly, it was also observed that the full time mushroom production farms were more efficient as compared to the part time mushroom farms because of the lower scale efficiency value or smaller area for mushroom production allotted in the part time farms.

• International Area Studies Review
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• v.20 no.2
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• pp.63-83
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• 2016

This paper examines the determinants of efficiency in a KOSDAQ-listed manufacturing firm. We use Data Envelopment Analysis (DEA) to estimate the efficiency of the export manufacturing firm. We employ two inputs (number of employees, equity) and one output (sales) in the DEA. The determinants of export manufacturing firm efficiency are estimated using the panel Tobit model. An analysis of 369 export manufacturing firms from 2013 to 2015 indicates the following results: First, the R&D intensity, the wage and salary intensity, total asset, and equity ratio each had a negative impact on both the CCR and BCC efficiency scores. However, export intensity had a negative impact on CCR efficiency scores in a KOSDAQ-listed total export manufacturing firm. Second, the R&D intensity had a positive impact on both the CCR and BCC efficiency scores, but export intensity, the wage and salary intensity, and equity ratio each had a negative impact on the CCR and BCC efficiency scores in a KOSDAQ-listed large export manufacturing firm. Third, the R&D intensity, the wage and salary intensity, total asset, and equity ratio each had a negative impact on both the CCR and BCC efficiency scores; respectively, in a KOSDAQ-listed small and medium export manufacturing firm.

• Journal of Korean Society of Transportation
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• v.27 no.4
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• pp.63-76
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• 2009

On the basis of a Stochastic Frontier Approach (SFA), this paper analyses revenue efficiencies for the same sample of Korean and Japanese railways in the papers which analyze cost efficiencies using a generalized translog functional form. The paper also compares the results of revenue efficiencies with cost efficiencies and evaluates the effects of managerial autonomy and privatization on the firm-specific efficiencies. The results show that the average estimate of revenue inefficiency is 7.02% when the term of inefficiency is assumed to be distributed as a half-normal and 6.98% as a exponential for the total sample. Also, standardized inefficiencies in revenues (7.5%) are greater than those in costs (2.1%). JR East and JR West are found to be most efficient on the revenue side and on the cost side respectively while JNR and JR Kyushu are worst efficient on the both sides. Finally, the correlations between efficiencies in revenues and costs also between efficiencies and privatization are positively correlated. The results suggest that the most independent companies, with increased managerial autonomy via privatization, are the most efficient in both revenues and costs.

• The Journal of the Korea Contents Association
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• v.19 no.5
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• pp.64-73
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• 2019

This study analyzed the efficiency by using the DEA model to evaluate the competitiveness of specialty construction firms. The target of the analysis is 300 firms with continuous data from 2010 to 2017 as listed and externally listed firms. Significant analysis results are as follows. First, the efficiency of specialty construction firms is lower than that of general construction industry. Second, efficiency by type was highest in facilities construction and dismantling work. This shows that the relevant industries such as reinforced concrete works and scaffolding and demolition work are relatively efficient in specialty construction industry. Third, the efficiency of specialty construction industry is affected by economic fluctuations. When the construction industry is in the expansion phase, the efficiency value is high and the efficiency value is low in the down phase. Finally, in the scale profitability analysis, specialty construction industry was most analyzed by DRS. This means that it is effective to scale down for the efficiency of the firm.

• Journal of Navigation and Port Research
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• v.29 no.6 s.102
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• pp.495-500
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• 2005

This paper presents an approach to the measurement of efficiency which is trunk route of global liners. Data envelopment analysis(DEA), as it is called, has particular applicability in the service sector. Applying mathematical programming techniques, DEA enables relative efficiency ratings to be derived within a set of analysed units(Iine services). This paper investigates the efficiency employing DEA Model of line services classified into routes( ex. America-asia line, Europe-asia line, Pendulum line etc). Results of this paper, suggests to some plans for improving the performance in the side of operating global liners.

• Knowledge Management Research
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• v.22 no.4
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• pp.173-187
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• 2021

In that economic growth strategy through maximizing input would not working anymore in the rapidly changing economic environment, now we should focus on the improvement of firms' efficiency. This study estimate the efficiency and determinants of the efficiency using the panel data of 938 Korean manufacturing firms which ranked in high R&D investment firms during 2005~2018. We found that both R&D intensity as R&D input and patent stock as R&D output increase the efficiency of firms independently. And firm size, debt ratio, profitability also affect the firm's efficiency.

• Journal of Service Research and Studies
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• v.11 no.4
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• pp.43-55
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• 2021

This study analyzed the efficiency of medical services in OECD member countries by dividing it into operational efficiency and quality efficiency. For this purpose, data from 2017-2019 OECD Health Statistics were used. As the analysis method, super efficiency was measured by applying an output-oriented Variable Returns to Scale (VRS) model. As a result of the analysis, Switzerland, Korea, and Italy were included in the high group of operational efficiency, Canada, Greece, Denmark, etc. in the medium group, and Belgium, Germany, and Spain in the low group. Based on quality efficiency, Norway, Switzerland, and Spain are in the high group, and Greece, Denmark, Mexico, etc. are in the medium group, and the Netherlands, Germany, Belgium, etc. were included in the low group. As a result of comparative analysis of efficiency by OECD member countries as of 2018, it was found that Korea's operational efficiency was the most efficient and quality efficiency was inefficient. Korea (0.998) should improve life expectancy by 0.2 (0.2%) and subjective health perception by 44.2 (138.1%) by benchmarking Greece (0.422), Switzerland (0.207), and Spain (0.371) to improve quality efficiency. Unlike most previous studies that focused on operational efficiency, this study measured quality efficiency together and analyzed the efficiency of the medical service industry in each OECD member country. Through this, this study has implications in that it confirmed the international competitiveness of the domestic medical service industry and suggested ways to improve efficiency.

• Proceedings of the Korean Institute of Navigation and Port Research Conference
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• 2015.07a
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• pp.194-196
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• 2015

우리나라 항만배후물류단지는 선진항만에 비해 활성화가 미흡하고 다양한 비즈니스모델 개발이 필요하다. DEA모형을 이용하여 우리나라 항만배후물류기업의 경영 효율성을 비교, 분석함으로써 항만배후물류기업의 효율성 수준을 파악하고, 비효율적인 항만배후물류기업의 효율성 개선방안을 제시하고자 하였다.