• Proceedings of the Korean Society for Technology of Plasticity Conference
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• 2009.05a
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• pp.102-106
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• 2009

Thermal energy control is a important factor in a large size casting and forging. Good control of thermal energy makes characteristics and defect of large cast-forged part, such as large sized forged shell. We have studied about not only large size ring forging process and after heat treatment by FEM simulation. Also, changes of temperature and microstructure for forged shell were predicted. Therefore, we can choose the proper heat treatment condition by FEA. The sectional properties confirmed by practical experiment and evaluation have presented possibilities of process design by computational analysis.

• Journal of the Korea Safety Management & Science
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• v.9 no.1
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• pp.133-144
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• 2007

Quality management has been applied to the industry for strengthening the competitiveness regardless of the size of company. However, it has been argued that the operational models for quality management used in the large-sized enterprise could not be applied to the small & medium-sized enterprise (SME) directly. This paper analyzes the states and outcomes of movements for quality innovation in the SME and tries to give some suggestions for improving and spreading the movements within the framework of the cooperation with the large sized company. Survey results show that the preferable quality movements depends on the size of company. Especially, the Single PPM movement is most preferable in the SME. It contributes th decreasing the fraction defective and to vitalizing the communication and cooperation between large-sized company and SME.

• KSII Transactions on Internet and Information Systems (TIIS)
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• v.8 no.6
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• pp.2139-2151
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• 2014

Embedded system testing, especially long-term reliability testing, of flash memory solutions such as embedded multi-media card, secure digital card and solid-state drive involves strategic decision making related to test sample size to achieve high test coverage. The test sample size is the number of flash memory devices used in a test. Earlier, there were physical limitations on the testing period and the number of test devices that could be used. Hence, decisions regarding the sample size depended on the experience of human testers owing to the absence of well-defined standards. Moreover, a lack of understanding of the importance of the sample size resulted in field defects due to unexpected user scenarios. In worst cases, users finally detected these defects after several years. In this paper, we propose that a large number of potential field defects can be detected if an adequately large test sample size is used to target weak features during long-term reliability testing of flash memory solutions. In general, a larger test sample size yields better results. However, owing to the limited availability of physical resources, there is a limit on the test sample size that can be used. In this paper, we address this problem by proposing a self-adaptive reliability testing scheme to decide the sample size for effective long-term reliability testing.

• International Journal of Advanced Culture Technology
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• v.9 no.2
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• pp.91-99
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• 2021

In Korea, some pharmaceutical companies and agricultural machine manufacturers associate the length of the credit period with the retailer's order size. This kind of commercial practice is based on the principle of economy of scale from the supplier's point of view and tends to make retailer's order size large enough to qualify a certain credit period break. Also, the credit period allowed by the supplier makes it possible to reduce the retail price expecting that the retailer can earn more profits by the stimulating the customer's demand. Since the retailer's order size is affected by the end customer's demand, it is reasonable to determine the retail price and the order size simultaneously. In this regard, this paper analyzes the retailer's problem who has to decide his sales price and order quantity from a supplier who offers different credit periods depending on his order size. And we show that the retailer's order size large enough to qualify a certain credit period break. Also, it is assumed that the end customer's demand rate is represented by a linear decreasing function of the retail price.

• Journal of the Korea Academia-Industrial cooperation Society
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• v.21 no.12
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• pp.401-410
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• 2020

The purpose of this study is to reveal the magnitude of the correlation effect between variables related to empowerment of social workers. To this end, 30 studies published in Korea were analyzed through meta-analysis. The results are as follows. First, the overall effect size of the variable group was the median effect size; the job-related positive variables showed the largest effect size among the variable groups, and then came the organization-related variables, the personal psychology-related variables, the job-related negative variables, and the personal background variables in that order. Second, among the factors related to personal background variables, all factors except position were found to have a small effect size, or close to a small effect size. Self-esteem, which is an individual psychologically related variable, showed a medium effect size close to a large effect size. Among the organizationally related variables, organizational commitment and transformational leadership showed a large effect size, and organization culture showed a medium effect size. In addition, job satisfaction, which is a positive job-related variable, showed a large effect size, while burnout from job-related negative variables showed a large effect size, and turnover intention showed a medium effect size.

• Journal of the Korean Society of Manufacturing Technology Engineers
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• v.20 no.5
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• pp.523-527
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• 2011

Polycarbonate (PC) polymer is an engineering plastic which has large tensile strength and impact resistance and is wildly used as functional parts like micro mold. Direct machining of PC materials produces lots of burrs and rough surface due to large ductility and weak heat resistance and hence it is very difficult to machine PC materials using cutting tool to make micro-parts. In this study, elliptical vibration cutting (EVC) or 2-dimensional vibration cutting was performed to minimize the size of micro V-grooves on PC material. From the experimental results, it was observed that as the cutting depth and pattern size become smaller, the better machining quality was obtained, which is attributed to the positive effect of EVC that is dependent on the ratio of vibration amplitude to cutting depth. As the height of V-groove becomes less than $1.8{\mu}m$, however, the machining quality becomes lower as the pattern size decreases.

• Journal of Ginseng Research
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• v.5 no.2
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• pp.85-91
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• 1981

Ginseng seeds were gathered from 3,4,5 and 6 years of age and were classified into four qroups (below 4mm, 4∼5mm, 5∼6mm and above 6mm in across sieve). They were sown in seedling bed and some characters were investigated in each qroup of seed size. 1. The distribution of seed size of below 4mm, 4-5mm, 5-6mm and 6mm were 23.7%, 60.8%, 12.4% and 4.5%, respectively. 2. The ratio of seed coat dehiscence was not affected by seed size but emergence ratio and emerging vigor were superior in large seed. 3. The large seed showed superiority in stem length, stem diameter, leat and also in root length, root diameter and root weight. but diseased root was not affected by seed size. The effect of age(seed harvest) was not significant on all those characters.

• Journal of Korean Society of Industrial and Systems Engineering
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• v.18 no.36
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• pp.133-141
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• 1995

One of the problems brought up in the effective execution of genetic algorithms is that if they come under any influences according as the population size is large or small. In the case of small population size the opportunities of premature convergence are increased when the greatly powerful or no good individual is generated during search of the solution space. And searching the solution space in the case of large population size, the difficulties under the execution cause to searching all for one by one individual in every generation applied is limited, this gives the many interruptions to the convergence of final solution. Now this paper gives a suggestion to set up the adaptive population size which could compute the more correct solution and simplify the development of computation performance.

• Journal of The Korea Institute of Healthcare Architecture
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• v.6 no.10
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• pp.41-49
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• 2000

Today, medical system faces to two major flows of change. The first one changes to small-to-middle size special hospital from large size general hospital. The another one changes to the patient-focused hospital. In these two flows of change, women's hospital is a typical small-to-middle size special hospital. In Korea, several studies on the architectural planning of delivery-part designed with recent trends in large size general hospital have done with focusing on LDR type or LDR/P type, but few studies on the architectural planning of the recent trends in women's hospitals. Therefore, this study aims to propose improve way after analysis the developing circumstances and problems on the Architectural planning on women's hospital by case studies on Women's hospital builded recently in Korea.

• East Asian Economic Review
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• v.16 no.2
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• pp.205-225
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• 2012

I use panel data of sales by the foreign subsidiaries of the U.S. MNCs to examine whether trading blocs create more or less FDI and the impacts on FDI of the extended market size created by forming blocs. By employing a region-fixed effects model, I find that countries forming trading blocs attract more FDI, particularly from non-member countries, but that FDI does not always increase with the market size of the blocs. As the market size increases, FDI increases only for large blocs. However, these findings are sensitive to model specifications. A policy implication is that a country considering forming or joining a trading bloc with a view to attract FDI may want to form a trading bloc with a country or countries with a large market size.