• 한국유기농업학회지
• /
• 제19권spc호
• /
• pp.87-91
• /
• 2011

Eco-efficiency which is calculated by dividing economic productivity by the environmental load was made by synthesizing eco and efficiency from ecology and economy, proposed by World Business Council for Sustainable Development in 2000. Eco-efficiency by connection of resource efficiency with resource intensity is used as an indicator for evaluating green growth for minimizing the impact on the environment and achieving economic development as well by means of efficient use of resources. This research analyzes eco-efficiency with the case of organic agriculture promoted as a key green growth policy. Thirty questionnaires for farmers producing organic rice in Hongseong-gun, Choongcheongnam-do were used for the analysis. Eco-efficiency was measured by means of the amount of used nitrogen with respect to the amount of income, and was represented that organic agriculture was 32.0 higher than conventional agriculture. The analytical result of technical efficiency, using the (Data Envelopment Analysis (DEA) model showed that it is 0.765 which has a possibility of 21% in management improvement, and higher eco-efficiency was with higher technical efficiency. The analytical results showed that an organic agriculture contributes to green growth more than conventional agriculture. In addition, higher technical efficiency groups exhibited higher eco-efficiency indices.

• 한국복식학회:학술대회논문집
• /
• 한국복식학회 2001년도 19th International Costume Association Congress
• /
• pp.50-52
• /
• 2001

The main purpose of this study is to research ways for waste reduction in manufacturing, materials regeneration and clean production in apparel manufacturing in Taiwan, in order to achieve 3E: Efficiency, Economy and Environmental Protection. Specifically, this study hopes to address the following three areas: (1) To study the processing technologies which can turn apparel wastes to resources (2) To increase the efficiency in the use of energy and resources in apparel production (3) To establish a system for improving the recovery from unwanted apparel in Taiwan, in order to improve environmental protection and to reduce pollution.

• KDI Journal of Economic Policy
• /
• 제40권2호
• /
• pp.53-73
• /
• 2018

Using an overlapping generations model, this paper examines tax policy effects across generations. The model incorporates housing assets separately from capital assets and includes taxes on labor income, capital income, consumption and housing assets. Tax reforms for each tax rate have different effects on tax burdens across generations and the overall efficiency of the economy, leading to different welfare costs for generations. Specifically, raising housing property taxes results in the smallest welfare loss by future generations, as in the model it does not hurt economic efficiency and the tax burden increases mainly for the elderly, who have accumulated housing assets in preparation for retirement.

• 한국철도학회:학술대회논문집
• /
• 한국철도학회 2008년도 추계학술대회 논문집
• /
• pp.762-769
• /
• 2008

Each nation of the world is competing aiming for the growth of economy and quality of life, and, knowledge based economic system is accelerated. So, R&D is continuously propelled for possession of technology is core in the knowledge based economic system. Our government is investing R&D but efficiency is the continuous theme of the study. Also, government's railway R&D made visible fruits and analyze that.

• 아태비즈니스연구
• /
• 제5권1호
• /
• pp.1-11
• /
• 2014

The study provides new empirical evidence on the level of profit efficiency and returns to scale of the Bangladesh banking sector. We employ the Slack-Based Data Envelopment Analysis (SBM-DEA) method to assess the level of profit efficiency of individual banks over the years 2004 to 2011. The empirical findings indicate that the Bangladesh banking sector has exhibited the highest and lowest level of profit efficiency during years 2004 and 2011 respectively. We find that only eight banks have been profit efficient throughout the period under study. The empirical findings seem to suggest that most of the Bangladesh banks have been experiencing economies of scale due to being at less than the optimum size, or diseconomies of scale due to being at more than the optimum size. Thus, decreasing or increasing the scale of production could result in cost savings or efficiencies.

• 동력기계공학회지
• /
• 제9권3호
• /
• pp.26-32
• /
• 2005

The volumetric efficiency is significantly affected by the behavior of pressure wave in induction system and exhaust pipe. By the motion of the piston, there exist pressure fluctuation in induction system which produce waves. Waves are propagated along a pipe bi-directional as they propagated through it, making compression wave and rare-faction(expansion) wave. These wave phenomena can affect to the volumetric efficiency. As a method of improvement of the volumetric efficiency, fuel economy and pollutant emission reduction particularly in low engine speeds, a side-branch additional tunable helmholtz resonator on the secondary pipe of intake system is proposed by use of their acoustic vibrations. Some of results are presented which deal with their physical phenomena for the wave action of intake system in a four-stroke three cylinders diesel engine.

• 한국융합학회논문지
• /
• 제9권4호
• /
• pp.1-7
• /
• 2018

전기자동차용 전동기는 운전모드에 따라 효율특성이 차이가 나기 때문에 저속 및 고속의 운전모드에서 고효율특성을 평가하기 위한 연구는 매우 중요하다. 따라서 전기자동차 구동용 전동기의 고토크 및 고출력 밀도, 고효율특성을 변경할 수 있는 설계 방안이 필요하다. 본 논문에서는 매입형 영구자석 동기전동기의 고정자와 회전자의 직경비를 각각 0.62, 0.65, 0.68로 변경 설계하여 전 운전구간의 효율특성과 시내 및 고속도로 운전모드에서의 평균효율특성을 분석하였다. 전 운전구간의 효율특성을 분석한 결과, 직경비가 증가할수록 고효율 구간이 저속 저토크 구간으로 이동하고, 직경비가 감소할수록 고효율 구간이 고속 저토크 부근으로 이동함을 확인하였다. 시내 및 고속도로 운전모드에서의 평균효율특성을 분석한 결과, 직경비 0.68 모델이 직경비 0.63 및 0.65 모델보다 평균효율이 높게 분석되었으며 시내 및 고속도로 주행모드에 적합함을 확인하였다.

• 대한기계학회논문집B
• /
• 제35권9호
• /
• pp.947-954
• /
• 2011

차량에서 구동계의 의한 손실은 전체 연료 소비 손실에서 약 4%를 차지하며 그 중에서도 자동변속기는 구동계 손실에 큰 영향을 끼친다. ATF W/C 열교환기는 근래에 관심이 높아지고 있는 부품인데, 자동변속기 윤활유의 온도를 적정한 상태로 유지시켜 줌으로서 연비 개선 효과를 얻을 수 있다. 본 연구에서는 ATF W/C 열교환기 단품 특성을 실험적으로 파악하고, ATF W/C 열교환기가 실제 차에 장착되었을 때의 연비 개선 효과를 살펴보았다. 본 연구에서는 실험을 통하여 ATF 와 냉각수의 온도와 유량에 대한 유용도를 파악하고 유용도를 예측하기 위한 상관식을 도출하였다. MATLAB의 Simulink 프로그램을 통하여 실험의 결과를 바탕으로 ATF W/C 열교환기 유무에 따른 연료 소모량을 비교 하여 연비 개선 효과를 분석하였다. 그 결과 ATF W/C 열교환기가 장착된 자동차는 0.992% 연비 개선 효과가 나타났다.

• 아태비즈니스연구
• /
• 제12권2호
• /
• pp.1-24
• /
• 2021

Purpose - We aim to verify whether CSM activities increase investment efficiency, and to verify whether the influence of CSM activities on investment efficiency is discriminatory depending on whether or not they belong to chaebol. Design/methodology/approach - Using 4,701 Korean firm-year observations over the 2011-2017 period, we used multiple regression analysis. CSM is measured by the evaluation score of the Korea Corporate Governance Service (KCGS). Findings - Our study confirms that CSM is a significantly positive relationship with investment efficiency. This shows that, as a result of CSM, the increased earnings quality acts as an incentive to increase investment efficiency. Next, in analysis of a dataset into two groups (a chaebol, non-chaebol), the results show that the relationship between CSM and investment efficiency differs among detailed indicator activities depending on whether or not they belong to chaebol. Research implications or Originality - It is significant that this study focused on and analyzed CSM as a determinant of investment efficiency, and examined the effects of whether or not it belongs to chaebol in the relationship between CSM and investment efficiency. Our results, which suggested that CSM can increase investment efficiency, are expected to provide important implications not only for managers but also for investors and supervisors.

• 한국게임학회 논문지
• /
• 제9권2호
• /
• pp.81-93
• /
• 2009

본 논문은 21세기 지식기반 경제의 가치 창출 원천이 새로운 아이디어와 창의성의 주체인 인적자본에 있음을 근거로 국내 온라인게임 기업 인적자본 운영의 효율성을 연구해보았다. 온라인게임 산업은 최근 국가 신성장 동력으로 주목 받고 있는 문화콘텐츠 서비스업의 하나로, 세계 최고의 기술과 콘텐츠를 기반으로 하여 높은 연평균 성장률과 수출 공헌도를 보이고 있는 산업이다. 이런 맥락에서 본 논문은 인적자본이론, 지식경제이론, 경제성장이론에 기초하여 온라인게임 산업에서 인적자본이 지속적인 성장을 견인할 수 있음을 이론적으로 규명하였다. 또한 대표적인 비모수적 분석모형인 자료 포락 분석(DEA)을 통하여 국내 온라인게임 기업의 인적자원 운영 규모, 투자, 교육, 보상의 투입 효율성을 기업의 산출이라고 할 수 있는 매출을 기준으로 실증 분석 하였다. 이 연구를 통해 국내 온라인게임 기업들에게 미래의 지속 가능한 성장 동력인 인적자본을 운영함에 있어 최적의 효율성을 달성할 수 있도록 전략적 시사점을 제공할 수 있을 것이다