• Journal of Korea Port Economic Association
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• v.26 no.4
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• pp.63-87
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• 2010

The purpose of this paper is to measure the efficiency of Korean container terminals by using SFA(Stochastic Frontier Analysis). Inputs[Number of Employee, Quay Length, Container Terminal Area, Number of Gantry Crane], and output[TEU] are used for 3 years(2002,2003, and 2004) for 8 Korean container terminals by applying both SFA and DEA models. Empirical main results are as follows: First, Null hypothesis that technical inefficiency is not existed is rejected and in the trasnslog model, the estimate is significant. Second, time-series models show the significant results. Third, average technical efficiency of Korean container terminals are 73.49% in Cobb-Douglas model, and 79.04% in translog model. Fourth, to enhance the technical efficiency, Korean container terminals should increase the handling amount of TEUs. Fifth, both SFA and DEA models have the high Spearman ranking of correlation coefficients(84.45%). The main policy implication based on the findings of this study is that the manager of port investment and management of Ministry of Land, Transport and Maritime Affairs in Korea should introduce the SFA with DEA models for measuring the efficiency of Korean ports and terminals.

• Journal of Service Research and Studies
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• v.9 no.1
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• pp.87-97
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• 2019

The key to the success of IT services is to ensure user-oriented strategic planning and system design capabilities to accurately read the user's mind. In order to establish a stable UI/UX strategy that provides user-oriented service, estimating the size of the relevant market and predicting the growth potential should be given priority, but there is no research on this. Therefore, this study estimated the relevant market based on the 'SW market size (IDC Worldwide Blackbook.') As a result of estimating the amount and the number of cases, the planning and design area of UI/UX is lower than that of overseas market The results of this study suggest that it is necessary to systemize the establishment of UI/UX strategy that depends on individual competence so far, It is possible to make economic value judgments by standardization and quantification of UI/UX by establishing an opportunity to access the interface. From the technical viewpoint of application of the user's viewpoint on the existing interface, We expect to be able to lead the UX strategy management through the occasion of access to UI/UX. Identify needs and to demonstrate the value of UX strategy applied is significant.

• Journal of Digital Convergence
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• v.13 no.5
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• pp.393-400
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• 2015

The purpose of this study to examine the effect of intermittent fasting and resistance exercise on sex hormone and glucose metabolism of middle-aged women for 12 weeks. The two groups classified that one group(EG) was done intermittent fasting and resistance exercise both, the other group(CG) was controled. The group of EG was applied doing intermittent fasting 1 time for 24 hours a week, and doing resistance exercise 3 times for 60 minutes a week. The intensity of the exercise was 60%. Each measurement variable measured before and after 12 weeks to investigate the effect. During this study got the result with this step. First, EG have shown small interaction with sex hormone. Second, EG have shown small interaction with resistance exercise. Therefore, this study give us positive result to effect of intermittent fasting and resistance exercise on sex hormone and glucose of middle-aged women for 12 weeks. However, it has limitation to verify effect of intermittent fasting and resistance exercise.

• Journal of Digital Convergence
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• v.11 no.10
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• pp.577-584
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• 2013

IGRT(Image Guided Radiation Therapy) in radiation therapy is a very useful technique in order to increase setup of patient and position reproducibility. Tomotherapy can increase accuracy of setup to take IGRT by MVCT, but it be for verified accuracy of Image guided, and MVCT occurs the exposure of patient. Through this study, IGRT accuracy of Tomotherapy is very accurate within 1.0mm. When MVCT using Tomotherapy phantom for QA, QC be taken, exposure dose is Fine(2mm Slice thickness) 3cGy, Normal(4mm Slice thickness) 1.5cGy, Corse(6mmSlice thickness) 1.0cGy. Measurement value of spatial resolution using AAPM CT performance phantom did't cause a big difference. As a result, ability of IGRT in Tomotherapy is very accurate. While obtaining image for IGRT, we should minimize expose range because patient's be exposed to radiation. We should make an effort to do accurate radiation therapy to minimize exposure of patient by selecting the appropriate thickness of MVCT depending on patient's body and treat area.

• Journal of Digital Convergence
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• v.11 no.9
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• pp.239-246
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• 2013

The purpose of this study was to identify the effects of family resilience on the positive attitudes toward a children with disabilities of non-disabled siblings. For this purpose, a survey data was collected from 110 siblings with disabled children. The general characteristics of the parent questionnaire, and the general characteristics of a child with a disability, non-disability sibling's general characteristics, be receptive attitude, consisted of family resilience, and the data were analyzed by frequency analysis, descriptive statistics, t test, ANOVA and regression analysis by SPSS 18.0. Structural equation was used for black AMOS18. The results of the measurement analysis were summarized as follows: 1. family resilience showed positive correlation with positive attitudes toward a children with disabilities of non-disabled siblings. 2. as a result of regression analysis for find out influence of family resilience on the positive attitude of non-disabled siblings, family resilience was statistically significant influence factors, which 50%, 50% explanatory power. In conclusion, these results reinforce the important of considering family context as a contributor to the positive attitudes toward a children with disabilities of non-disabled siblings, so it could be suggested that family resilience needs to be improve.

• Journal of Digital Convergence
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• v.15 no.2
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• pp.67-80
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• 2017

Today, Emotional Intelligence of the leader has become important in order to achieve the achievement of the organization. Especially, the automobile industry is somewhat conservative and the organizational culture of the subcontractor is still much more important than the service industry which has a flexible. In this context, I examine the Emotional Intelligence on Organizational Citizenship Behavior and Innovative Behavior in manufacture of automobile industry focusing on moderating effect of Authentic Leadership. This Study enhances the understanding of Emotional Intelligence and extends the research. Future research will needed to pioneer research methods such as various aspects of measurement and time series of various variables.

• Journal of the Korea Society for Simulation
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• v.23 no.1
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• pp.21-31
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• 2014

In this article, data mining simulation is applied to find a proper approach and results of analysis for study of variables related to organization. Also, turnover intention and organizational commitment are used as target (dependent) variables in this simulation. Classification and regression tree (CART) with ensemble methods are used in this study for simulation. Human capital corporate panel data of Korea Research Institute for Vocation Education & Training (KRIVET) is used. The panel data is collected in 2005, 2007, and 2009. Organizational commitment variables are analyzed with combined measure variables which are created after investigation of reliability and single dimensionality for multiple-item measurement details. The results of this study are as follows. First, major determinants of turnover intention are trust, communication, and talent management-oriented trend. Second, the main determining factors for organizational commitment are trust, the number of years worked, innovation, communication. CART with ensemble methods has two ensemble CART methods which are CART with Bagging and CART with Arcing. Comparing two methods, CART with Arcing (Arc-x4) extracted scenarios with very high coefficients of determination. In this study, a scenario with maximum coefficient of determinant and minimum error is obtained and practical implications are presented. Using one of data mining methods, CART with ensemble method. Also, the limitation and future research are discussed.

• Fire Science and Engineering
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• v.34 no.3
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• pp.141-149
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• 2020

The Korea Industrial Standards (KS) stipulates methods and test procedures for measuring the horizontal combustibility of cellular plastics exposed to small flames (KS M ISO 9772:2018) and recommendations regarding the magnetic digestion of extruded polystyrene insulation (XPS) for measurement results (KS M 3808:2020). Although products that are certified to conform to KS standards must have burning characteristics (self-extinguishing), they are incinerated and spread by welds at construction sites, causing significant human and property damages. In this study, XPS produced by five companies, certified by KS, and sold in the market were purchased and tested for ignition and diffusion caused by a weld bullion at a construction site. The results showed that the five products had differences in performance. Three out of the five products were found to be self-saturated, but the other two were easily ignited and diffused, making it difficult for them to be self-extinguishing. Based on the result of this experimental investigation in line with the KS regulations, all the three types of products, including two types of products that were incinerated through weld defects, were found to be non-self-extinguishing, as specified in KS M 3808.

• Journal of the Korean Geotechnical Society
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• v.36 no.7
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• pp.5-14
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• 2020

Kansai International Airport (KIX) was opened in September 1994. Although 26 years have passed since the completion of the first island, long-term settlement is still in progress. This settlement occurs in the Pleistocene layer. For it is not easy to determine the permeability of the Pleistocene sand layer because the thickness and the degree of fine content in the horizontal direction are constantly changing. In addition, it is also a difficult to predict the interactive behavior of the ground due to the construction of the second phase island adjacent to it. In order to solve this problem, a two-dimensional finite element analysis considering elasto-viscoplastic was performed to evaluate the long-term deformation, including the interactive behavior of the alternating Pleistocene foundation due to the construction of two adjacent reclaimed islands. In general, two-dimensional analysis can be used when a section can represent the entire sections. However, Kansai Airport is an artificial reclaimed island so two-dimensional analysis cannot solve the problem such as the stress deformation in the corners of the island. Additionally, the structure of the actual sub-ground through physical exploration is non-homogeneity and its thickness is also not constant. Therefore, there are limitations for the two-dimensional analysis to explain the phenomena. That is, three-dimensional analysis is strongly required. Due to these demands, the author extended the existing two-dimensional program capable of elasto-viscoplastic analysis to three-dimensional and completed the verification of the three-dimensional program developed through one-dimensional consolidation analysis. In order to demonstrate the validity of the developed 3D program that has been verified, an analysis is performed under the same analysis conditions as the existing research using a two-dimensional program. The effectiveness of the developed 3D numerical analysis program was demonstrated by comparing the analysis results with the 2D results and actual measurement data.

• Journal of Environmental Policy
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• v.6 no.2
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• pp.1-25
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• 2007

This paper attempts to measure the environmental value of the Seomjin-River estuary that has been comparatively well conserved but is confronted with the threat of its development. Especially, in order to elicit the environmental values of its four attributes, contingent valuation method(CVM) based on multi-attribute utility theory is applied and the CVM survey was rigorously designed to comply with the guidelines. for best-practiced CVM studies. We surveyed a randomly selected sample of 300 and 350 households in the Seomjin-River estuary-neighboring area(Gwangyang, Sooncheon, Yeosu, Hadong, Namhae) and seven large cities(Seoul, Busan, Incheon, Daegu, Daejeon, Gwangju, Ulsan), respectively and asked respondents questions in person-to-person interviews about what they would willing to pay for the estuary conservation and management program. Respondents overall accepted the contingent market and were willing to contribute a significant amount(5,763 won in the Seomjin-River estuary-neighboring area and 1,883 won in seven large cities), on average, per household per year, which implies that there is a large difference between the two. The aggregate values of the Seomjin-River estuary in the estuary-neighboring area and seven large cities amount to 1.52 and 14.05 billion won, respectively, per year. The quantitative values can be utilized in planning and decision-making about development versus conservation of the estuary.