• Journal of Ecology and Environment
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• 제35권4호
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• pp.291-299
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• 2012

This experiment was conducted to investigate the effects of the addition of wintering waterfowl's feces prior to planting rice on nutrient dynamics, rice growth, and decomposition of rice straws in a controlled mesocosm. Waterfowl's feces and rice straws were placed on paddy soils in a mesocosm and the water level maintained at 5 cm. The amounts of supplied feces were 0 (control), 222, and 444 g/$m^2$. While the addition of feces showed no immediate effects, nutrients in the surface water increased in the month following treatment. Nutrients increased to a greater degree in the treatments with more feces added. Simultaneously, the decomposition of rice straws was promoted, indicating that more nutrients would be made available over time. The rice showed high productivity in the period during which nutrient level was increased, when rice needs more nutrients for the tillering stage. Therefore, the wintering waterfowl's feces could be associated with increased productivity during the growing season of rice through promoting nutrient supply and rapid decomposition of rice residue.

• 노동경제논집
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• 제23권1호
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• pp.81-101
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• 2000

본 연구의 주목적은 종업원 경영참여제도의 경제적 효과를 분석하는 데 있다. 먼저 경영참여제도와 보완적 관행들-고용 안정성, 교육훈련제도, 합리적 보상체계, 정보의 공유 및 권한 위임-과의 유기적 결합을 통해 노사공동선 달성이 가능하다는 이론적 분석 들을 제시하고 있다. 그리고 이 분석 틀에 의거하여 회귀분석을 통하여 참여제도와 보완적 관행들의 결합에 의해 기업의 성과수준(1인당 부가가치생산성) 향상이 가능하다는 것을 구명하였다(가설 1). 그리고 t-test와 판별분석을 통하여 참여제도의 도입 및 운영수준이 높고, 보완적 관행들과의 상호결합이 잘 이루어지는 기업들과 그렇지 않은 기업들 간에는 기업의 성과수준과 근로자 삶의 질 수준에 뚜렷한 차이가 있다는 것을 구명하였다(가설 2). 이러한 연구결과는 참여제도 도입의 당위성올 제공한다고 볼 수 있다.

• 한국산학기술학회논문지
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• 제15권4호
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• pp.1971-1982
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• 2014

본 연구는 국내 IT 제조업과 IT 서비스업, 그리고 비IT 제조업을 대상으로 기업의 고객지향성, 기술혁신지향성, 사회적 책임지향성이 기업의 경영성과에 어떤 영향을 미치는가를 분석하였다. 그 결과 고객가치지향성이 기업의 업무생산성에 영향을 미치며, 간접적으로 경영성과지표 향상에 영향을 미치는 것으로 나타났다. 또한 기술혁신지향성은 업종이 조절작용을 하며, IT 서비스기업의 경우에만 경영성과에 유의적인 영향을 미치는 것으로 나타났다. 마지막으로 기업의 사회적 책임지향성은 업무생산성에는 직접 영향을 미치지 않으나, 경영지표 향상에는 영향을 미치는 것으로 나타났다.

• Journal of Korea Trade
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• 제23권3호
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• pp.1-19
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• 2019

Purpose - This research examines the effect of a foreign subsidiary on the productivity growth of a Two-way trading manufacturing firm in Korea. We explore firms engaged in both trade and FDI simultaneously to verify whether participation in GVC as a broad concept is an efficient internationalization strategy to increase the productivity of a Korean manufacturing firm. Design/methodology - Based on the firm-level data by utilizing the Survey of Business Activities from Statistics Korea, we examine the impact of vertically integrated foreign subsidiaries on the productivity of a manufacturing firm that exports and imports simultaneously. Findings - The results show that if a Two-way trading firm establishes one or more overseas subsidiaries, the total factor productivity growth increases. Moreover, the FDI effect is statistically significant when the destination country has an economically close relationship with Korea. However, these effects are disparate depending on the industrial competitiveness or market situation where the subsidiary is located. Nonetheless, the synergy effect resulting from industrial combination is represented in China and the USA only. Originality/value - As the importance of GVC has become more emphasized around the world. In spite of the scarcity of related domestic studies, we explored the effect of multinational manufacturing firms participating in GVC using firm-level data.

• 한국미생물·생명공학회지
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• 제2권1호
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• pp.29-35
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• 1974

We have studied the applicability of the principles and inherent advantages of the two-stage dontinuous uclture technique to an enzyme process for the purpose of improving and optimizing the productivity of 3-ketosteroid-delta-1-dehydrogenase. By using a two-stage continuous culture system, the growth st ageand enzyme produdtion stage are separated. In each stage an optimal set of toperaing conditions was determined, and this was tested for feasibility for the period of 10 days. During this period, at least 70％ of the maximum enzyme productivity could be maintained. The important design parameters studied are: (1) optimal specific growth rate in the first stage which corresponds to the maximal cell productivity, (2) the optimal dilution rate in the second stage which in turn determines the size of second stage fermentor and the mean residence time of cells in the second stage, (3) cell concentration in both stages, add (4) the specific enzyme productivity and enzyme productivity of the second stage. In addition, by using two-stage continuous culture system we have been able to reduce or eliminate the effect of catabolite repression due to high medium concentration and the adverse effect of the solvent used to dissolve the inducer. We have found the balance between the opposing effects of induction and repression in the second stage judging from the observation that the enzyme productivity goes through a maximum.

• 환경정책연구
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• 제8권3호
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• pp.115-138
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• 2009

본 연구의 목적은 중국의 28개 성과 자치주를 대상으로 성장회계분석에 기초하여 전통적 생산성 성장과 환경조정 생산성 성장을 비교함으로써 각 지역의 생산성에 미치는 환경요소의 효과와 경제성장의 주된 요소를 실증적으로 계측하고자 함이다. 추가적으로 환경조정 생산성 변화를 측정하기 위해서 중극 지역별 SOx의 존재가격을 측정할 것이다. 1997년~2005년 동안 중국은 장기적으로 10.06%인 고도의 경제성장률을 보였다. 지역별로 동부의 성장이 가장 빠르고 중부의 성장률이 가장 낮다. 전통적 총요소생산성은 평균적으로 3.56%로 나타났고 지역별로 동부가 가장 높았다. 환경조정된 생산성 증가율은 평균적으로 3.57%로서 전통적 생산성 증가율과 큰 차이는 나지 않았다. 이는 세 지역에서 오염저감활동이 적극적으로 이루어지지 못하고 있음을 보여준다. 따라서 정책적으로 중국 정부에서는 환경 규제를 부단히 강화시키거나 제정된 환경규제를 엄격히 집행할 필요가 있다.

• 한국항해항만학회지
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• 제46권6호
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• pp.547-553
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• 2022

본연구는 2019~2021년 14개 국적 외항 컨테이너 선사의 생산성 변화를 MPI(Malmquist Productivity Index)를 통해 분석하였다. 분석 기간 14개 선사의 MPI는 연평균 38.4% 증가한 것으로 분석되었다. MPI 변화 원인을 살펴보면, TCI(Technical Change Index)는 연평균 58.3% 증가하였으나 TECI(Technical Efficiency Change Index)는 연평균 12.6% 감소한 것으로 나타났다. 이는 선박의 효율성 또는 선대 규모 확대 효과보다는 운임상승에 의한 생산성 향상이 주원인임을 의미한다. 원양 해운선사인 HMM과 SM상선은 타 선사(아시아 역내 선사)와 달리 TECI와 TCI가 모두 생산성 향상에 긍정적인 영향을 미친 것으로 나타났다. 반면, 아시아 역내 선사의 경우 TCI(i.e. 운임상승) 값의 증가에 의한 생산성 향상이며, TECI값 중 SECI(Scale Effieicency Change Index) 값이 낮아 이들 선사는 선대 규모(규모의 경제) 변경에 따른 비용 절감 효과를 거의 누리지 못한 것으로 분석되었다.

• 기술사
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• 제42권4호
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• pp.62-67
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• 2009

Labor productivity issues within the construction industry are receiving increasing attention. With the improvement in the standard of living, domestic laborers are avoiding 3D (Difficult, Dirty, and Dangerous) jobs by degrees. Because of this situation, the problem of insufficient labor is exacerbating in several basic industries. In particular, insufficient labor is a serious problem in the construction sector, where the workers are ageing and labor costs are increasing. In this study, we adopt a systematic approach to identify factors that influence labor productivity and analyze the causality between the factors and their ripple effects with the aim that the results of the study will help improve labor productivity and ensure its effective management.

• Journal of the Korean Data and Information Science Society
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• 제19권4호
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• pp.1449-1463
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• 2008

This paper considers three different models with two functional forms, Cobb-Douglas and Translog, for the stochastic frontier production function of food manufacturing industry of Bangladesh over the period 1981-1982 to 1999-2000. The models are proposed by Battese and Coelli (1992, 1995) and Huang and Liu (1994). The technical efficiency, total factor productivity, technological change and technical efficiency change have been estimated in the frontier models. The results indicate that 41.47%, 59.30% and 70.98% of the potential output are being realized in this sector. The mean increments in total factor productivity are approximately 2%, 9% and 4% respectively.

• Animal Bioscience
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• 제36권4호
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• pp.540-554
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• 2023

Heat stress is a major challenge to animal production in tropical and subtropical climates. Rabbits suffer from heat stress more than farm animals because they have few sweat glands, and their bodies are covered with thick fur. Intensive farming relies on antibiotics as antimicrobials or growth promoters to increase animals' productivity and health. However, the European Union and many countries have banned or restricted the use of antibiotics in animal feed for human health concerns. Several studies have found that replacing antibiotics in rabbit feed with natural plants or feed additives increases productivity and improves immune capacity, especially under heat stress conditions. Growth performance, immune response, gut microflora, and carcass yield may be increased in rabbits fed a diet supplemented with some natural plants and/or propolis. In this review article, we discuss and summarize the effects of some herbs and plant extracts as alternative feed additives on rabbit productivity, especially for those raised under hot ambient temperatures.