• KSBB Journal
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• 제5권2호
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• pp.159-165
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• 1990

Ethanol fermentation by Scccharomyces cervisiae was carried out in the cell recycle filter system with a cheap fabric filter having a pore size of 10${\mu}$m. Maximum biomass concentrations up to 85g/1 were obtained, but in practice operational concentrations were between 50 and 80g/1. Ethanol productivity was 42g/1-hr, with an ethanol concentration of 66g/1 and an ethanol yield of over 86%. Continuous operation was possible by applying periodic backflushing. The ethanol fermentation could be carried out without difficulty at a dilution rate up to 0.8h-1 In order to obtain a high cell concentration and ethanol productivity, development of filter module with the larger filtration area is required.

• 한국건축시공학회:학술대회논문집
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• 한국건축시공학회 2013년도 춘계 학술논문 발표대회
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• pp.173-175
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• 2013

In tall building construction, the equipment operation plans have an effect on productivity. Equipment, used in tall building construction, has operating plans of each it and restrictively operate owing to the first placed equipment operation. Therefore the interference of equipment was occur frequently. As it, the productivity is less effective and the construction delay occurs. This research was analysis the interference elements between the equipment for constructing the efficient equipment associated operational processes. The interference elements between the equipment derive through expert advice and analysis using IPA. Through the IPA, this research deducted the interference elements located 'Concentrate Here' which is the highest importance and the lowest performance.

• 임상간호연구
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• 제19권2호
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• pp.169-180
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• 2013

Purpose: This study was performed to investigate nurses' experience of bullying in clinical fields. Methods: Participants were 309 nurses working in general hospitals. Data were collected using self- report questionnaires which were evaluated in terms of workplace bullying, burnout, organizational commitment, turnover intention and nursing productivity. Results: Of the participants 17.2% reported being victims of workplace bullying of nurses in general hospital, based on the operational definition of bullying. Coping response to workplace bullying was mainly passive such as enduring, ignoring, and evading. Experience of workplace bullying was positively correlated with burnout and turnover intention and negatively correlated with organizational commitment and productivity. Conclusion: The findings suggest that there is a need for assessment of the reality of workplace bullying of nurses in clinical areas as well carefully reviewing the problem and impact. A supportive system, education programs and improved workplace climate are recommended to reduce workplace bullying in clinical fields.

• Biotechnology and Bioprocess Engineering:BBE
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• 제11권6호
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• pp.544-549
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• 2006

The performance of immobilized fungal cells on celite beads for the production of gibberrelic acid was investigated in flasks and 7-L stirred-tank reactor. Repeated incubations of immobilized fungal cells increased cell concentrations and volumetric productivity. The maximum volumetric productivity obtained in the immobilized-cell culture was 3-fold greater than that in suspended-cell culture. The concentration of cotton seed flour (CSF), among the various nutrients supplied, most significantly influenced productivity and operational stability. Notably, insoluble components in CSF were found to be essential for production. CSF at 6 g/L with 60 g/L glucose was found to be optimal for gibberellic acid production and stable operation by preventing excessive cell growth.

• 대한교통학회지
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• 제22권4호
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• pp.7-18
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• 2004

지난 10년간 아시아 태평양 지역은 세계에서 가장 급속히 성장한 항공 운송 시장이며 1990년대에 수익성이 높은 항공사들은 대부분 아시아 지역의 항공사들이었다. 아시아 지역의 항공교통 수요가 빠른 속도로 증가할 것으로 예측됨에 따라 아시아 각국은 치열하게 전개되는 항공시장에서의 경쟁 우위를 점하고자 허브 공항을 목표로 신공항 건설 또는 공항 확장 사업을 추진하고 있다. 본 논문의 목적은 DEA를 이용하여 아시아 주요 공항들의 여객터미널 운영 효율성을 측정하고 비교 분석하는 데 있다. 분석대상 공항은 2001년 여객처리실적 상위 100위권 내에 있으며 아시아 지역의 허브 공항을 목표로 하는 공항 중 자료 수집이 가능한 11개의 공항을 선택하였다. 전문가 설문을 통해 5개의 투입 변수와 1개의 산출 변수가 실증 분석을 위해 선정되었고 분석대상 공항의 여객 터미널 운영 효율성을 측정하였다. 또한 에어사이드에 대한 DEA 분석도 추가로 시행하였다.

• 한국항만경제학회지
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• 제39권1호
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• pp.47-63
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• 2023

스마트 항만 및 항만 자동화에 수직 배치형 컨테이너 터미널을 적용하여 운영하는 사례가 늘고 있다. 본 연구는 수평 배치형과 수직 배치형 컨테이너 터미널에서의 본선작업 시간을 분석함으로써 각 터미널간 생산성을 비교하고, 향후 수직 배치형 컨테이너 터미널의 운영 효율성 증대 방안을 제시하고자 한다. 이를 위해 각각을 대표하는 터미널을 선정하여, 2018년부터 2022년까지 최근 5년 선석배정현황 데이터를 수집하였으며, 모수적 생존분석 기법인 가속실패시간모형(Accelerated Failure Time, AFT)을 활용하여 분석을 실시하였다. C/C 작업 조건이 '동일하다'는 가정 하에서, 수직 배치형 컨테이너 터미널에서의 본선 작업 생산성이 보다 좋은 것으로 나타났으며, 코로나19 기간에는 생산성이 감소한 결과를 나타냈다. 작업량이 많은 선박의 경우와 유럽 선사의 선박의 경우, 본선작업 시간이 감소하는 걸 알 수 있다. 적정 C/C의 투입 및 효율적 운영, 장비들 간 원활한 운영, shifting 작업은 증가, C/C를 포함한 하역 장비들의 준비시간 감소 및 고장/사고 최소화 등 수직 형태 컨테이너 터미널의 생산성을 높이기 위한 방안을 제시하였다.

• 한국의류학회지
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• 제31권6호
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• pp.942-954
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• 2007

본 연구는 의류기업의 공급사슬 기반활동과 마케팅 역량, 업무성과의 구성차원을 파악하고, 업무성과 향상을 위한 공급사슬 기반활동과 마케팅 역량의 효율적인 활용방안을 모색해 보았다. 공급사슬구조의 중간단계에 위치하고 있어 전체 산업의 전후방에 미치는 효과가 크고, 모든 가치활동을 수행할 능력을 가진 대규모 의류유통기업을 대상으로, 한국패션브랜드연감, 한국의류산업협회 등에 등록된 회원사 리스트를 바탕으로 단순무작위 표집하였다. 설문지 조사방법을 통해 총 95부를 자료분석에 이용하였고, 공급사슬 기반활동, 마케팅 역량, 업무성과 수준을 6점 척도로 측정하였다. 변수의 차원 분류 및 타당도, 신뢰도를 파악하기 위해 요인분석과 신뢰도분석을 실시하였고 공급사슬 기반활동, 마케팅 역량이 업무성과에 미치는 영향을 알아보기 위해 다중회귀분석을 실시하였다. 공급사슬 기반활동은 구조적, 물류적, 기술적 요인으로 분류되었고, 마케팅 역량은 차별화, 비용우위, 경영우위 요인으로 분류되었고, 업무성과는 재무시장, 생산, 고객만족으로 분류되었다. 공급사슬 기반활동이 업무성과에 미치는 영향은 기술적 활동강화를 통해 재무시장, 생산, 고객만족성과를 얻을 수 있었고, 구조적 활동강화를 통해서는 생산성과를 극대화 할 수 있었다. 마케팅 역량이 업무성과에 미치는 영향은 차별화 역량강화를 통해 재무시장과 고객만족성과를 얻을 수 있었고, 비용우위 역량은 생산성과에, 경영우위 역량은 재무시장성과에 영향을 미치는 것으로 나타났다.

• 대한영양사협회학술지
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• 제8권4호
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• pp.387-397
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• 2002

Foodservice information systems management practices were assessed in hospital foodservice operations. A total of 46 dietetic departments were responded for the study and their practices of foodservice information systems were analyzed. The respondents were questioned about general characteristics of respondents as well as hospital foodservices implementation status of information systems. Statistical data analysis was completed using the SPSS package program for descriptive analysis, factor analysis, t-test and ANOVA test. 43.2% of total respondents gained informations by benchmarking of other hospital foodservice operations, but 7.8% gained through career education. They expected the enhanced efficiency of their tasks through implementing information systems. Based on factor analysis, information systems were divided into 6 management areas such as database management, meal management, nutrition management, purchasing management, production management and foodservice management. The average implementing scores were : database management 3.77, meal management 3.26, nutrition management 3.52, purchasing management 3.26, production management 2.73 and foodservice management 3.70 (score 1 indicates very poor and score 5 is very good). Among database management areas, standard recipe database and food item specifications database build-up scores(3.91) were relatively very high, but meal assessment and foodservice management reporting scores(2.43) were very low. The results suggest that it is necessary to build up automated foodservice management reporting system for the improvement of efficiency and productivity of operational tasks.

• 사물인터넷융복합논문지
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• 제9권2호
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• pp.41-46
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• 2023

스마트공장 구축 사업은 국내 및 국외에서 지속적으로 수행되고 있다. 특히 불확실성이 증대하는 시기에는 기업의 생산성 향상을 위해 스마트공장에 대한 관심이 높아지기도 한다. 현재 국내에서도 정부 주도의 스마트공장 구축 사업이 지속적으로 추진되어 오고 있다. 이러한 구축사업의 가시적인 성과가 생산성 향상, 품질개선, 원가 절감 등의 지표들에서 매우 긍정적으로 나타나고 있다. 반면에 스마트공장 구축 후에 운영상의 어려움 등을 파악하는 설문조사에서는 다양한 내용들이 나타나고 있다. 본 연구에서는 2017년과 2020년에 시행된 설문조사 내용에 나타난 시스템 구축 후 운영상의 어려움(문제점)등을 분석하여 이들에 대한 개선 방안을 도출하였다. 이러한 개선 방안들이 스마트공장 구축 사업의 해당 과정에서 시행된다면 기업들이 느끼는 운영상의 어려움 등이 감소될 것으로 보이며, 기존보다는 만족도가 높은 시스템이 구축될 수 있을 것이다.

• 유통과학연구
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• 제11권8호
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• pp.5-14
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• 2013

Purpose - We live in a world of constant change and competition. Many airports have specific competitiveness goals and strategies for achieving and maintaining them. The global economic recession, financial crises, and rising oil prices have resulted in an increasingly important role for facility investment and renewal and the implementation of appropriate policies in ensuring the competitive advantage for airports. It is thus important to analyze the factors that enhance efficiency and productivity for an airport. This study aims to determine the efficiency levels of 20 major airports in East Asia, Europe, and North America. Further, this study also suggests suitable policies and strategies for their development. Research design, data, and methodology - This paper employs the DEA-CCR, DEA-BCC, and DEA-Malmquist production index analysis models to determine airport efficiency. The study uses data on the efficiency and productivity of the world's leading airports between 2006 and 2010. The input variables include the airport size, the number of runways, the size of passenger terminals, and the size of cargo terminals. The output variables include the annual number of passengers and the annual cargo volume. The study uses basic data from the 2010 World Airport Traffic Report (ACI). The world's top 20 airports (as rated by the ACI report) are investigated. The study uses the expanded DEA Model and the Super Efficiency Model to identify the most effective airports among the top 20. The Malmquist productivity index analysis is used to measure airport effectiveness. Results - This study analyzes longitudinal and cross-sectional data on the world's top 20 airports covering 2006 to 2010. A CCR analysis shows that the most efficient airports in 2010 were Gatwick Airport (LGW), Zurich Airport (ZRH), Vienna Airport (VIE), Leonardo da Vinci Fiumicino Airport (FCO), Los Angeles International Airport (LAX), Seattle-Tacoma Airport (SEA), San Francisco Airport (SFO), HongKong Airport (HKG), Beijing Capital International Airport (PEK), and Shanghai Pudong Airport (PVG). We find that changes in airport productivity are affected more by technical factors than by airport efficiency. Conclusions - Based on the study results, we offer four airport development proposals. First, a benchmark airport needs to be identified. Second, inefficiency must be reduced and high-cost factors need to be managed. Third, airport operations should be enhanced through technical innovation. Finally, scientific demand forecasting and facility preparation must become the focus of attention. This paper has some limitations. Because the Malmquist productivity index is based on the hypothesis of the, the identified production change could be over- or under-estimated. Further, as DEA estimates the relative efficiency. It also cannot generalize to include all airport conditions because the variables are limited. To measure airport productivity more accurately, other input variables and environmental variables such as financial and policy factors should be included.