• 한국건축시공학회:학술대회논문집
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• 한국건축시공학회 2021년도 가을 학술논문 발표대회
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• pp.188-189
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• 2021

The technology of manufacturing freeform molds with S-LOM based 3D printer has advantages in the production period and the curvature range. However, there is no any support tool about productivity analysis of S-LOM technology because S-LOM technology is early-stage technology. There can be problems about increase of construction time and cost without any decision support tool like productivity analysis models etc. Therefore, in this study, the productivity analysis simulation model for freeform formwork based on S-LOM technology was developed using ARENA software. The process and logic of manufacturing freeform molds can be easily visualized in this model. Futhermore, the resource like labor, equipment and material can be easily optimized with this model. As a result, it can contribute to preventing the increase of construction time and cost in formwork with further productivity analysis.

• 한국항해항만학회지
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• 제44권4호
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• pp.338-346
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• 2020

본 연구에서는 국적외항선사를 대상으로 DEA에 의한 Malmquist 생산성지수를 측정하여 주요 재무비율(수익성, 재무안정성, 유동성, 효율성, 생산성 간에 영향 관계와 판별력을 규명하여 생산성을 개선할 방안을 제시하였다. 2017년에 비하여 2018년에 생산성(MPI)이 증대한 선사보다 감소한 선사가 11개 많다. 생산성 감소는 주로 내부환경의 영향을 받는 기술적 효율성 변화지수(TECI)의 감소가 주요인이며, 생산성이 증대된 선사는 외부환경의 영향을 받는 기술변화지수(TCI)의 증대로 나타나고 있다. 또한 생산성(MPI)과 경영효율성(CRS) 간의 강한 유의적인 상관관계를 보인다. 선사 내부요인에 의한 기술적 효율성변화지수(TEC)는 효율적인 선사가 유의적으로 높은데 순수효율성 변화가 아니고 규모효율성변화의 차이에 기인한다. 용선비/매출 비율은 생산성이 높은 선사(0.17)가 낮은 선사(0.21)에 비하여 낮고, 매출액영업이익률은 MPI>1인 선사는 7%인데 MPI<1인 선사는 1%에 불과하여 용선비 규모와 영업수익성은 생산성과 밀접한 관련이 있는 것으로 판명된다. 따라서 외항선사는 용선비중을 줄이고 내부적인 경영효율 개선을 통한 규모 효율과 생산성을 증대시켜야만 채산성을 높일 수 있는 것으로 확인하였다.

• 보건의료산업학회지
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• 제11권1호
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• pp.11-25
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• 2017

Objectives : The purpose of this study is to analyze the differences in financial performance, productivity, and patient care performance between metropolitan and non - metropolitan hospitals and examine the factors affecting profitability of both groups. Methods : The survey period consisted of three years of data that can identify the financial performance of the hospital. The survey subjects were selected from 58 metropolitan hospitals, 87 non - metropolitan hospitals and 147 hospitals. Results : There was a significant difference in stability, activity, cost index, productivity, and patient care performance between the metropolitan and non - metropolitan hospitals, and metropolitan hospitals showed a relatively higher ratio. Conclusions : In the metropolitan and non-metropolitan hospitals, the variables of productivity and cost index increase the profitability. However, if the factors with less influence on the results of the study are applied to the variables of various situations, it may have a great influence on the profitability increase.

• 한국건설관리학회논문집
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• 제6권5호
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• pp.139-147
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• 2005

During a typical construction project, a contractor nay often find that the time originally available or normally expected to perform its work has been severely reduced. To finish the project by the completion date, the contractor is forced to find a way to speed up the progress of its work to compensate for the reduction in available time. The most frequent initial reaction of contractors to this situation is to increase on-site manpower by working longer time (overtime), adding more workers (overmanning), or implementing shift work (shift work) to increase the rate of progress. The goals of this study were to investigate how these three methods affect labor productivity and to quantify their impact on labor productivity by analyzing real project data collected from sheet metal contractors and mechanical contractors in the US.

• 한국생산제조학회지
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• 제22권2호
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• pp.275-280
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• 2013

The tractor front axle has the lower standard for noise and vibration relatively and it increase the possibility to develop of the alternative straight bevel gear of the expensive spiral bevel gear. The purpose of this paper is to compare of the spiral vs. the straight bevel gear manufacturing process. The manufacturing cost and productivity are compared after the spiral bevel gear of the tractor front axle is replaced of to the straight bevel gear. If spiral bevel gear is replaced to straight bevel gear, the cost is reduce 4.6% and productivity is increase 18%.

• 디지털융복합연구
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• 제10권11호
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• pp.271-277
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• 2012

본 연구의 목적은 콘센트용 아크로 플레이트공정의 불량률을 줄이고 생산공정 개선을 통하여 생산성 향상시키는데 있다. 사출과정에서 사출시 온도와 압력에 대한 실험계획으로 최적의 조건을 찾아내고 아크로 플레이트 금형 개선을 하여 생산성을 향상시켰다. 본 연구에서는 사이클 타임은 70초에서 51초 줄었고 불량률은 20%에서 0.5%로 감소하였으며 생산원가 240원에서 201원으로 절감 효과를 가져왔다.

• 한국식품영양학회지
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• 제9권3호
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• pp.336-340
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• 1996

Rhizopus japonicus had the highest chitosan productivity compared with the chitosan productivity among Rhizopus sp. strains. To increase the productivity of microbial chitosan from Rhizopus faponicus, production medium and incubation conditions were optimized. The composition of the medium and the incubation conditions were as follows : starch 2%, yeast extract 2.5%, KH2PO4 0.05%, MgSO4 0.01%, FeSO4 0.002%, MnSO4 0.002%, ZnSO4 0.002%, CaC12 0.002%, PH 5.5, incubation temperature medium compared with chitosan productivity.

• 산업융합연구
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• 제13권1호
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• pp.11-23
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• 2015

Organizations use multiple team membership to enhance individual and team productivity and learning, but this structure creates competing pressures on attention and information, which make in difficult to increase both productivity and learning. My model describes how the number and variety of multiple team memberships drive different mechanisms, yielding distinct effects.

• 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.

• Journal of Applied Biological Chemistry
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• 제62권1호
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• pp.67-71
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• 2019

All countries, including Korea, are currently experiencing the effect of rapid climate change. As a result, the cultivation area of many crops including wheat is changing, or productivity is falling sharply. If enough nitrogen is present in the soil, the increase in atmospheric carbon dioxide due to the greenhouse effect can lead to increased photosynthesis of plants, resulting in increased productivity. By contrast, a low proportion of nitrogen in soil does not increase production, often leading to the use of nitrogen fertilizers to increase crop productivity: this causes serious environmental pollution due to the leakage of nitrogen fertilizers used by crops. Increasing the understanding of the molecular level of the plant nitrogen use efficiency mechanism may contribute to increased productivity of crops and reduced of environmental pollution by nitrogen. In Korea, cultivars have developed 35 kinds of wheat, such as 'keumgang' and 'Chokyeong', which can be used for specific purposes such as baking or noodles. In this study we investigate 'keumgang' and 'Chokyeong' in order to elucidate the mechanism of nitrogen use ability of wheat and contribute to the reduction of environmental pollution by providing guidelines for the proper use of nitrogenous fertilizer.