• Proceedings of the Korean Vacuum Society Conference
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• 2012.08a
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• pp.215-215
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• 2012

Sillicon Wafer는 순도 99.9999999%의 단결정 규소를 사용하여 만들어진다. 웨이퍼의 표면은 결함이나 오염이 없어야 하고 회로의 정밀도에 영향을 미치기 때문에 고도의 평탄도와 정밀도를 요구한다. 특히 실리콘의 순도는 효율성에 영향을 주는 주요 원인으로 금속의 오염은 실리콘 웨이퍼의 수명을 단축시켜 효율성을 떨어뜨린다. 표면에 흡착된 구리와 니켈은 Silicon 오염의 주요인 중 하나로 알려져 있다. 이 연구는 Silicon Wafer 표면에 흡착된 구리가 내부로 확산되는 메커니즘을 규명하는 것을 목표로 한다. 표면에 구리가 흡착된 상태는 AES 및 LEED로 관찰하였다. 표면에 흡착된 구리의 표면(수평)및 내부(수직)확산은 SIMS를 이용하여 연구하였다.

• 대한방사선방어학회:학술대회논문집
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• 2011.11a
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• pp.308-309
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• 2011

• 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 Digital Convergence
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• v.17 no.12
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• pp.129-137
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• 2019

The purpose of this study is to analyze the efficiency of budget utilization of science and technology by the Chinese autonomous province and to present the direction of improvement. Data were obtained from the 2013-2017 statistical yearbook of higher education published by the Ministry of Education of China, and efficiency was analyzed using the malmquist analysis method. The analysis found that the low technological progress caused changes in the productivity MPI index, and that cities affected by technological efficiency needed to improve internal factors such as internal coordination and restructuring of universities in the region to increase efficiency. And it was found that areas affected by technological change needed proper response to external factors such as government policy, economic environment, social environment or technological development. This study is meaningful in that it presented reference data in enhancing efficiency of budget utilization of science and technology by autonomy of China, and it is necessary to establish strategies and study essential factors to increase efficiency of inefficient areas in the future.

• Journal of Animal Science and Technology
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• v.49 no.2
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• pp.279-286
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• 2007

A submerged biofilm sequencing batch reactor (SBSBR) process, which liquor was internally circulated through sandfilter, was designed, and performances in swine wastewater treatment was evaluated under a condition of no external carbon source addition. Denitrification of NOx-N with loading rate in vertical and slope type of sandfilter was 19% and 3.8%, respectively, showing approximately 5 times difference, and so vertical type sandfilter was chosen for the combination with SBSBR. When the process was operated under 15 days HRT, 105L/hr.m3 of internal circulation rate and 54g/m3.d of NH4-N loading rate, treatment efficiencies of STOC, NH4-N and TN (as NH4-N plus NOx-N) was 75%, 97% and 85%, respectively. By conducting internal circulation through sandfilter, removal performances of TN were enhanced by 14%, and the elevation of nitrogen removal was mainly attributed to occurrence of denitrification in sandfilter. Also, approximately 57% of phosphorus was removed with the conduction of internal circulation through sandfilter, meanwhile phosphorus concentration in final effluent rather increased when the internal circulation was not performed. Therefore, It was quite sure that the continuous internal circulation of liquor through sandfilter could contribute to enhancement of biological nutrient removal. Under 60g/m3.d of NH4-N loading rate, the NH4-N level in final effluent was relatively low and constant(below 20mg/L) and over 80% of nitrogen removal was maintained in spite of loading rate increase up to 100g/m3.d. However, the treatment efficiency of nitrogen was deteriorated with further increase of loading rate. Based on this result, an optimum loading rate of nitrogen for the process would be 100g/m3.d.

• 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.

• 한국IT서비스학회:학술대회논문집
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• 2005.11a
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• pp.592-599
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• 2005

본 논문은 자료포괄분석(Data Envelopment Analysis, DEA)을 이용하여 국내 SI회사를 대상으로 효율성을 측정하고 효율성의 연도별 추세를 분석하여 개별기업 및 산업차원에서 변화의 방향을 파악하였다. 기업집단의 소속여부에 따른 비효율성의 차이와 효율성에 영향을 미치는 주요 요인에 관해 실증적으로 분석하였다. 평균적으로 국내 SI회사의 기술적 효율성은 약간 하락하고 있으며, TE 및 PTE의 표준편차와 최대값-최소값의 범위는 상당히 증가하고 있어 양극화가 심화되고 있음을 확인하였다. 또한 기업집단 소속인 기업과 그렇지 않은 기업의 효율성을 분석한 결과 그 차이는 통계적으로 유의함을 검증하였다. 한편, 효율성에 영향을 미치는 각종 요인과 TE 및 PTE 간의 상관관계를 분석한 결과, 내부매출비중, 정보생산성, 인당매출, EBITDA율, 부가가치율, 투하자본 수익률(ROIC) 등과 TE 및 PTE 간에 모두 강한 상관계수를 보이고 있다. 이와 같은 효율성의 분석을 통해 SI산업의 지속 가능한 경쟁력을 확보하고 개별 기업의 효율성을 향상하기 위한 전략적 벤치마킹과 정책적 의사결정에 기여할 수 있다.

• Journal of the Korea Convergence Society
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• v.11 no.2
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• pp.207-214
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• 2020

The objective of this study is to analyze the effect of the quality of the Internal Accounting Control System(IACS) on Executive compensation, and to determine whether this relationship depends on the effectiveness of corporate governance. For the analysis, 6,343 firm-year data listed on the Korea Exchange from 2011 to 2016 were used. The results are as follows. First, Executive compensation was decreased in companies with low quality of IACS to provide a penalty for management. Second, the negative relationship between the weaknesses of IACS and Executive compensation was found to be strengthened when the corporate governance was effectively operated. These findings suggest that information about the quality of the IACS can be usefully used to reasonably identify the executive compensation policy, and that corporate governance needs to be operated more efficiently.

• KSCI Review
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• v.10 no.2
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• pp.16-24
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• 2003

최근, 기업은 급변하는 비즈니스 환경 속에서 업무 효율성 극대화가 비즈니스를 수행하는데 필요로 한다고 인식하고, 이를 위한 해결책이 조직원간 정보공유를 활성화하기 위한 지식경영 시스템을 도입하고 있다. 지식경영 시스템의 근간이 되는 디지털 문서들은 복사 및 전달이 쉽고 빠르게 이루어 질 수 있다는 문제점이 있다. 이에 따라, 기업은 업무 효율성을 높이면서 동시에 기밀정보의 유출을 방지하기 위한 정보보안 정책을 세우고 있는 실정이다. 대부분 기업들의 초창기 정보화 과정에서는 네트웍 보안에 치중하여 대다수의 기업 내부 정보 유출 사레가 내부자의 소행이라는 것이 밝혀지면서 업무의 효율성이라는 측면과 기업 내부 정보 보안을 위한 보안 기술을 채택하고 있다. 이에, 본 논문에서는 누출차단과 식별을 위한 다큐먼트 보안을 디자인함으로써, 디지털 정보보안 체계 확립과 더불어, 디지털 정보자산을 안정적으로 관리할 수 있게 되었다. 또한, 발생할 수 도 있는 디지털 정보자산의 불법유출을 사전에 차단함으로써 기업/기관의 노하우 및 정보자산을 안정적인 보호로 피해를 방지할 수 있게 되었다.

• Journal of Korea Port Economic Association
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• v.24 no.4
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• pp.47-70
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• 2008

The purpose of this study is to estimate total factor productivity(TFP) growth by stochastic frontier function and to grasp contributing factors of its growth rate by decomposing the total factor productivity into efficiency change, technical progress, scale change, and allocation change. Annual growth rate of total factor productivity for 1990-2003 is 0.019 (1.9%), higher than that of overall industry (0.010). The main component of TFP growth is not efficiency change but technical progress. Contributing factors of total factor productivity growth are change of allocation efficiency in port industry, technical progress in sea-transportation industry, and change of scale efficiency in transportation-equipment industry. The change of total factor productivity shows a decreasing trend since late in the 1990s. The annual technical efficiency of port-logistics industry is less than that of overall industry. Capital elasticity for output (0.391) is higher than labor elasticity (0.227), but scale economy of port-logistics industry is 0.618, which is far from optimal scale economy.