• KDI Journal of Economic Policy
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• v.27 no.2
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• pp.205-237
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• 2005

This paper analyzes a mechanism through which product market competition affects allocation of the managerial efforts. There are two types of firms, incumbents and entrants. Each incumbent firm delegates its control to a manager and cannot observe the manager's total effort. The managers of incumbent firms allocate their effort to two different activities: cost reduction (productive effort) and rent protection (unproductive effort). An increase in competition, measured by the number of incumbent firms, has two effects: an "output effect" which decreases the managerial incentive for productive effort, and an "effort substitution effect" that makes managers exert more productive effort and less unproductive effort. This paper identifies the conditions under which product market competition lowers the cost of providing incentives for productive effort and hence, to the conclusion that increased competition leads to increased efficiency.

• Proceedings of the Korean Institute of Navigation and Port Research Conference
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• 2020.11a
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• pp.20-22
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• 2020

한진해운 파산, 해운동맹 재편 이후 부산신항 컨테이너터미널의 운영 결과를 분석해 보고자한다. 이 연구에서는 DEA를 활용한 효율성 분석과 더 나아가 터미널 내부 자료를 활용한 생산성 분석을 통하여 터미널 운영사 간 비교를 통하여 시사점을 제공하였다.

• Journal of Navigation and Port Research
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• v.44 no.4
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• pp.338-346
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• 2020

In this study, we first measured the Malmquist productivity index by DEA among the Korean ocean carriers. Second, it was intended to present measures to improve productivity by identifying the influence and discriminating power between productivity and the major financial ratios (profitability, financial stability, liquidity, efficiency and value-added productivity). Compared to 2017, there are 11 more shipping carriers with decline in productivity (MPI) than those with an increase in 2018. The increase in productivity is attributed to an increase in the Technology Change Index (TCI) affected by the external environment. There is strong significant correlation between the productivity (MPI) and the management efficiency (CRS). Additionally, the TECI (TECHI) index of the technological efficiency changes from internal factors of the shipping carrier is significantly higher than that of the efficient shipping carrier. This is because of the differences in scale efficiency. The ratio of charter cost/sales is also lower than that of the carriers with high productivity (0.17) and with low productivity (0.21). With 7% of the shipping carrier with MPI>1, only 1% of MPI <1 is found to have a significant impact on its productivity.

• Journal of Ocean Engineering and Technology
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• v.15 no.4
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• pp.53-59
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• 2001

The Primary Production of phytoplanktons produces organic matter in high concentration in eutrophicated Hakata Bay, Japan, even during the winter season in spite of low water temperature. Phytoplanktons are considered to have any biological capabilities to keep activities of photosynthesis under the unfavorable conditions, and this affects water quality of the bay. In this study, seasonal variations in primary production efficiency were predicted by using a simple box-type ecosystem model, which introduced the concept of efficiency for absorption of solar radiation energy in relation to growth of phytoplanktons under the low solar radiation intensity. According to the simulation result of primary production, it was organic pollution comes from dissolved organic carbon (DOC) throughout the year, DOC of which is originated from the primary production of phytoplanktons on biological response of the seasonal variation of ambient conditions.

• Proceedings of the Korean Operations and Management Science Society Conference
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• 2003.05a
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• pp.71-75
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• 2003

오늘날 국내기업들은 국내$\cdot$외적인 경쟁 심화와 기술혁신 및 신제품개발, 정보화시대 도래에 따른 기업정보의 중요성 중대 등 급변하는 기업 환경 속에서 유연성 있는 경영조직 및 효율적인 관리시스템 확립을 통한 생산성 향상 및 경영효율화와 경영정보시스템 구축을 통한 정보자원의 효율적 관리 및 신속한 의사 결정 지원 등 기업내부의 경영혁신과 정보화를 위하여 많은 노력을 기울이고 있다. 그러나 여타 제조업체들에 비해 국내의 중소신발생산 기업들은 소수의 대형업체를 제외하곤 기업의 정보화 수준이 미미하며 체계적인 정보시스템 또한 전무한 실정이다. 이에 중소신발생산기업들이 활용할 수 있도록 수주에서 자재구매, 생산, 납품에 이르는 일관된 정보 흐름을 통해 기업의 주요한 정보인 주문정보, 제품정보, 자재발주 및 입고정보, 생산계획 및 생산실적정보를 관리할 수 있는 생산정보시스템을 개발 소개하고자 한다.

• Journal of the Korea Academia-Industrial cooperation Society
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• v.15 no.10
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• pp.6066-6075
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• 2014

The aim of this study was to analyze the productivity changes in government-funded research institutes for Economics & Humanities and Social Sciences. From Malmquist total factor productivity index analysis, the average productivity decreased 6.5% between 2006 and 2010. Further analysis showed that technical efficiency increased 4.7% annually while the technology change rate decreased 10.8% on average. Under pressure for innovation from the outside, research institutes responded to managerial efficiency improvement, which lead to increases in technical efficiency. On the other hand, for productivity improvement of government funded research institutes, they must pursue technological advances by securing an outstanding research workforce, expanding the R&D budget, and changing the R&D method. Each institute must perceive the cause of an individual institute's productivity change, and establish strategies for increasing productivity.

• Proceedings of the Korean Institute of Navigation and Port Research Conference
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• 2023.05a
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• pp.55-56
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• 2023

항만배후단지는 항만과 인접한 배후공간으로 항만의 기능이 더욱 활성화될 수 있도록 지원한다. 하지만, 국내 항만배후단지는 단순한 항만물류지원기능에 국한되어 있으며 인프라 시설, 정책 및 지원, 투자 미흡 등으로 인하여 항만배후단지 활성화에 어려움을 겪고 있다. 이에 본 논문은 국내 항만배후단지 업체별 내부자료를 바탕으로 DEA 분석 및 생산성 분석을 진행하여 국내 항만배후단지의 종합적인 정책방향을 도출하고자 하였다. DEA 분석결과 창고업의 경우 광양항 서측, 인천항 북항 항만배후단지가 효율적인 것으로 나타났으며, 제조업의 경우 인천항 북항, 울산항 1공구 항만배후단지가 효율적으로 나타났다. 또한, 외국인 투자규모별 생산성의 경우 광양항 서측, 평택당진항 1단계 항만배후단지가 높게 나타났으며, 시설 투자규모별 생산성은 광양항 서측, 인천항 북항 항만배후단지가 높은 생산성을 보였다. 마지막으로, 노동생산성은 인천항 북항, 부산항 웅동 항만배후단지가 가장 높은 생산성을 보였다. 이러한 결과는 항만배후단지 입주기업 선정 시 취급품목이 효율성에 중요한 영향을 주며, 외국인 투자규모, 시설 투자규모, 종업원 수가 항만배후단지의 생산성 향상으로 직결되고 있지 않다는 것을 나타낸다.

• Journal of Environmental Policy
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• v.14 no.2
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• pp.27-47
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• 2015

In this paper, we present a new empirical method to estimate the environmental efficiency of decision making units. We propose a model with a new approach that describes a network process consisting of two stages, production and wastewater abatement based on the data extracted from 51 Korean industrial complexes. Taking into account the inter-dependency of two stages, we show a process how to decompose the environmental efficiency into production efficiency and abatement efficiency. Moreover, our new proposed method can be used to explain the information on network relationship between economic growth and environmental protection.

• Proceedings of the Korea Information Processing Society Conference
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• 2012.11a
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• pp.927-930
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• 2012

현대 사회가 정보화 시대로 변화하면서 다양해진 데이터와 민감한 데이터를 생산, 유통, 소비 하고 있다. 이렇듯 데이터의 활용 방안이 다양해짐에 따라 처리하는 데이터의 양이 많아지게 되었으며 데이터의 안전한 관리 중요성 또한 커지게 되었다. 현재 사용되고 있는 데이터베이스 보안 시스템중 하나인 내부정보 유출 방지기술은 데이터베이스의 내부 데이터 유출을 미연에 방지하는 부분에 중점이 맞추어진 기술이다. 따라서 데이터가 유출되는 현상에 대해서 적절한 대응을 하지 못하고 있다. 이러한 취약점을 보완하기 위하여 데이터 유출을 방지하고, 효율적으로 관리할 수 있는 모니터링 시스템이 필요하다. 본 논문에서는 데이터베이스의 안전한 관리를 위하여 내부 정보 유출 탐지에 효율적인 데이터 베이스 내부자료 모니터링 시스템을 제안한다.

• KSBB Journal
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• v.8 no.3
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• pp.256-265
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• 1993

In this study, it was observed that hydrogen productivity varied with changes of input g1ucose concentration and dilution rate in FBR( Fixed Bed Reactor), and CSTR(Continuous Stirred Tank Reactor). We evaluated and compared reaction rate Parameters and internal external and overall mass transfer resistances of immobilized carrier in both reactors. Apparent $K_m$ decreased with increasing dilution rate in FBR but showed a constant value above $0.4h^{-1}$ of dilution rate in CSTR. The experimental results in FBR showed nearly analogous to those in CSTR, however, the performance of FBR resulted in lower hydrogen productivity and an external effectiveness factor but a higher internal effectiveness factor than in CSTR. The overall effectiveness factor obtained with various input 91ucose concentrations showed similar values in both reactors.