• Journal of the Korea Society for Simulation
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• v.28 no.3
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• pp.25-40
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• 2019

Today, container terminals are fiercely competing to attract an increasing number of containers. As a way to improve terminal productivity, this study proposes two dispatching rules for yard truck allocation priorities. First, Multi-Attribute Dispatching Rule(MADR) is an allocation method to calculate the weighted sum of multiple factors affecting container terminal productivity and priority them. Especially, the workload of the quay crane was considered one of the factors to reduce the residence time of the ship. Second, Cycling Dispatching Rule(CDR) is the effective way to increase the number of double cycles that directly affect terminal productivity. To identify the effects of combinations of pooling and dispatching, a comparative experiments was performed on 8 scenarios that combined them. A simulation environment has been developed for experiments and the results have demonstrated that the combination of terminal level pooling and Multi-attribute Dispatching could be an excellent combination in KPIs consisting of GCR and delayed departure of ships, etc.

• Journal of Convergence for Information Technology
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• v.8 no.4
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• pp.181-188
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• 2018

The purpose of this study is to investigate the effect of multicultural competence on the organizational effectiveness of daycare teachers and to provide basic data to improve organizational effectiveness of daycare facilities. To achieve this goal, 258 childcare teachers attending C university were sampled for convenience and statistical processing was performed using PASW. First, there was a positive correlation between organizational productivity, organizational adaptability, and job satisfaction in the relationship between multicultural knowledge and organizational productivity, organizational adaptability, organizational commitment, and job satisfaction. second. The relationship between multicultural awareness and organizational productivity, organizational adaptability, and organizational commitment were all statistically correlated. Third, multicultural knowledge and multicultural awareness have positive effects on organizational commitment, organizational adaptability, and organizational productivity. Fourth, multicultural knowledge has a positive effect on job satisfaction. Therefore, in order to improve organizational effectiveness of day care facilities in the era of convergence, education programs related to multicultural knowledge and multicultural awareness are needed for daycare teachers.

• Journal of Convergence for Information Technology
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• v.9 no.2
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• pp.34-42
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• 2019

In this study, we analyzed the effects of the automatic control system on the reactor operation. The Propyrene Reactor process is complex and typically is inefficient and costly due to the lack of productivity. In this study, a research model was presented with the aim of supplementing obstacles to enhance operational efficiency and increase productivity. The configuration of the existing processes was analyzed to complement the hardware and software systems with original models. The composition of the facility is applied to eight reactor units producing 600,000 ton/year propylene per year. As a result of applying the research model, efficiency of operation was increased, and production volume increased from 90 to 95%, along with 91% Reliability. Future studies will present a research model to improve productivity by 100 percent. In addition, we will study the stability and productivity improvement of PSA (Pressure Swing Adsorption) systems, which are the hydrogen production process of propylene by-products.

• Industry Promotion Research
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• v.8 no.1
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• pp.47-53
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• 2023

This study is an empirical study on the effect of eco-friendly management activities of small and medium-sized manufacturers on job improvement. The summary of the analysis results is as follows. first. Among the eco-friendly management activities of SMEs, it was analyzed that social activities did not have a statistically significant effect on job improvement, and second. Environmental activities were found to have a significant effect on work productivity with 𝛽= .394 (p<.001), and job satisfaction showed a low causal relationship with 𝛽=.216, p<.05, and third. Economic management activities were found to have a significant effect on job satisfaction, with 𝛽= .388 (p<.001). In addition, a low causal relationship was confirmed with 𝛽= .267 (p<.01) in work productivity. Therefore, among the effects on job improvement, it was found that environmental activities affect job productivity and economic management activities affect job satisfaction. This study is meaningful in creating an environment for SMEs' eco-friendly management activities, presenting competitive strategic directions, and providing basic data for research.

• 한국생물공학회:학술대회논문집
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• 2003.10a
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• pp.273-277
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• 2003

Batch culture of mutant derived from Pichia ciferrii ATCC 14091 was investigated for producing the intracellular tetraacetylphytosphingosine (TAPS). Composite experimental design was used to optimize the composition of the culture medium for maximizing the productivity of TAPS. In this experiment, various culture parameters were investigated that were the effects of temperature, the initial culture pH, the carbon-to-nitrogen ratio, the concentration of trace elements, and the concentration of cofactors. The optimal temperature for cell growth and TAPS synthesis appeared to be %25^{\circ}C$. An initial pH value of 7.5 gave the best results. Under the best condition, the maximum TAPS concentration indicated 7.2 g/L and its productivity was 0.06 g/L-hr in a 2.5 L jar

• KDI Journal of Economic Policy
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• v.38 no.3
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• pp.37-52
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• 2016

This paper analyzes the effects of allocative efficiency on productivity in the manufacturing sector of Korea following Hsieh and Klenow (2009). The results of this research indicate that the overall allocative efficiency declined from 1990 to 2012. Using the method of Oberfield (2013), which allows inter-industry resource movement as well as intra-industry reallocation, we confirm that intensified misallocation generally results from intra-industry allocative inefficiency. The potential loss from instances of worsening misallocation is estimated to be approximately 0.6% points for each year, which is considerable in terms of the overall TFP. In terms of the firm size distribution, initially large establishments are more likely to expand if distortions are removed in most countries. One notable feature in Korea is that this pattern is pronounced. This implies that subsidies to unproductive small-sized establishments are heavily implemented.

• 한국생물공학회:학술대회논문집
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• 2003.04a
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• pp.311-314
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• 2003

Under hyperosmotic stress, rCHO cells display decreased specific growth rate $({\mu})$ and increased specific antibody productivity $(q_{Ab})$. The effects of hyperosmotic stress on batch culture cellular dynamics are not well understood. To this end, we conducted a proteome profile of rCHO cells, using 2D-gel, MALDI-TOF-MS and MS/MS. As a result, the proteome profile of rCHO cells could be established using 41 identified proteins. Based on this proteome profile of rCHO cells, we have found at least 8 differently expressed spots at hyperosmotic osmolality (450 mOsm/kg). Among these spots, two metabolic enzymes were found to be up-regulated (pyruvate kinase and GAPDH), while down-regulated protein was identified as tubulin. It shows that hyperosmotic stress can alter metabolic state, by up-regulated activities of two glycolysis enzymes, which could lead to activate the generation of metabolic energy. Tubulin expression was down-regulated, suggesting a reduction of cell division. Finally, the increased conversion energy could leads to improve overall productivity.

• Asia pacific journal of information systems
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• v.10 no.3
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• pp.145-157
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• 2000

Economists have advocated that the market competitiveness improved the firm's productivity and eventually its service quality. However, the previous researches did not provide the empirical results enough to prove that the competitiveness do improve the service quality. In this paper, we conducted an empirical research to find whether the competition induces the quality of service. The telecommunication industry was chosen since it went through the increasing competition along with a high attention. We found that competition itself does not guarantee the quality of service. It is the intensity of competition that improves the service quality. The service quality depends mainly on the competitor's competence, i.e. the intensity of competition rather than the competition itself. In sum, when we want tc improve the service quality as well as the productivity, we had better increase the intensity of competition by allowing many new strong entities.

• Transactions of the Korean Society of Machine Tool Engineers
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• v.11 no.4
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• pp.102-106
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• 2002

Development of high speed feed drive system has been a major issue for the past few decades in machine tool industries. The reduction of the tool change time as well as rapid travel time can enhance the productivity. However, the high speed feed drive system generates more heat in nature, which leads thermal expansion that has adverse effects on the accuracy of machined parts. The detail of the model proposed is described in the paper together with the experimental methodologies using a proposed compact measurement system to examine the validity of the proposed approach. The results showed the machining accuracy could be maintained to better than $\pm$ 5$\mu\textrm{m}$ while using this sensor.

• Proceedings of the Korean Operations and Management Science Society Conference
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• 2005.05a
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• pp.207-214
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• 2005

Productivity and quality stability are very important competitive factors in PCB manufacturing lines that process the multiple types of products with the mixed process flows under frequent order information changes. MES is an appropriate IT solution to solve these problems in the medium-sized PCB manufacturing company. This paper introduces the MES development and its effects for a medium-sized PCB manufacturing company. The main functions of an implemented MES are delivery simulation, production scheduling, and production process monitoring. Productivity are improved up to $10{\sim}20%$ and manufacturing lead times per order are shortened up to 2 days according to the manufacturing scenarios.