• Communications for Statistical Applications and Methods
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• v.25 no.4
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• pp.385-396
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• 2018

Competing risks are commonly encountered in biomedical research. Regression models for competing risks data can be developed based on data routinely collected in hospitals or general practices. However, these data sets usually contain the covariate missing values. To overcome this problem, multiple imputation is often used to fit regression models under a MAR assumption. Here, we introduce a multivariate imputation in a chained equations algorithm to deal with competing risks survival data. Using pseudo-observations, we make use of the available outcome information by accommodating the competing risk structure. Lastly, we illustrate the practical advantages of our approach using simulations and two data examples from a coronary artery disease data and hepatocellular carcinoma data.

• The Journal of the Korea Contents Association
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• v.15 no.10
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• pp.669-678
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• 2015

This study aims at investigating students' perceptions and peer feedback to practicum for teaching English in the English Department at a Korean university. The participants were forty-two students at an elective course, 'Method for teaching English', and the data comprised questionnaire, 12 teams of practicum, and 15 sets of PF. A 'Word Count System (WCS)' was adopted to analyze the data. The findings show that students regarded 'practicum' (52.4%) as more important than 'teacher's lectures' (42.8%), and most students (80%) applied more than 70% of lesson plans to their practicums. The practicum gave them experience of a teacher, development of confidence, recognition on their weaknesses and values of teaching. While the strengths shown in PF were mainly 'teaching methods and technique', 'use of multimedia', and 'teaching materials', the weaknesses were 'classroom interactions', 'teaching methods and techniques' and 'use of blackboard'. Overall praises were 1.8 times more than the matters which needed to be developed. The conclusion suggest that the students had their own insights toward teaching practices and how learners can be motivated.

• KOREAN JOURNAL OF CROP SCIENCE
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• v.48 no.6
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• pp.534-539
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• 2003

The yield and quality characteristics of three rice varieties(Seojinbyeo, Ilpumbyeo, and Chuchungbyeo) in reclaimed saline paddy field were investigated under different cultural practices, three transplanting times (May 15, May 30 and June 15) and four harvest times (40, 50, 60 and 70days after heading) in order to obtain basic information for the production of high quality rice. Brown rice yield of three rice varieties were significantly higher in early and medium than late season cultivation. The protein content of milled rice showed high interaction effect between transplanting time and harvest time. Palatability values of Seojinbyeo and Ilpumbyeo were significantly higher in late than medium season cultivation, but Chucheongbyeo did not show any difference in its palatability value by different transplanting time. The palatability values of three rice variety was the highest in the harvest at 40 days after heading. The grain yield of three rice varieties were higher in early and medium than late season cultivation, whereas palatability values of three rice varieties were significantly higher in the early and late season cultivation than medium season cultivation. The palatability value measured by rice taster showed a highly negative correlation(r=$0.43^{**}$) with cumulative air temperature during ripening period.

• The Journal of the Korea Contents Association
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• v.19 no.9
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• pp.162-180
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• 2019

This study examined the effects of value-in-behavior toward pro-social consumption behavior on consumers' pro-social practices and the moderating effects of consumer's social capital based on trust and reciprocity that enhances collective actions to seek socially common values. The result showed that the value-in-behavior toward pro-social consumption was positive in general, and altruistic value was the highest, followed by emotional value, social value, and functional value. The pro-social behaviors of age groups were significantly different. In all pro-social behaviors, the older group was more active, except for the rejection of the unfair business. The result also showed that the functional value and emotional value have significant effects on consumer's pro-social practices. The interaction effects between trust and emotional value and between reciprocity and functional value were significant. Based on these results, the theoretical and practical implications for facilitating the transition to the direction of consumer's role in making positive social impacts.

• Korean Journal of Labor Studies
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• v.23 no.2
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• pp.141-167
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• 2017

This study carries out an empirical analysis of how workplace innovation affects employment growth. The theoretical model and hypotheses of this study are drawn from the previous research on the employment effects of innovation. I use the data on Workplace Innovation Indicators(2013-14) collected by Labor Foundation. As the regression models for this study, I adopt OLS models whose dependent variable is employment growth rate, and whose main independent variables are the adoption and the intensity(standardized values) of three innovative work practices such as TQM, employee suggestion plans and multi-skill training programs. The results of this study indicate that the adoption of workplace innovation does not have significant effects on employment growth, but that the intensity of workplace innovation has weakly positive effects on employment growth. Besides, the results of this demonstrate show that government-subsided organizational innovation consulting and training hours per capita have positive employment effects, but that wage level and prior employment size have negative ones. Finally the empirical results are outlined, and their limitations and the future direction of research on this topic are discussed.

• Korean journal of communication and information
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• v.62
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• pp.223-243
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• 2013

Value collision takes place in the news organization at times. The concept of social responsibility has been serving as the raison d'$\hat{e}$tre not just of individual reporters but eventually of journalism in general. But when the organizational interests are at stake, more realistic values contributing to the organization often override the normative values. This phenomenon occurs since there exists a clear discrepancy between the nominally highlighted values and the virtual values of press owner or news organization. Focusing on Chosun Ilbo, this paper tries to identify the values a news organization really underlines and pursues, and explores the nature of organizational culture embedded in these values. In specific, this study analyzes such performances as ceremonies and rituals, regular or occasional, in Chosun Ilbo, since these are cultural practices which produce and circulate particular meanings and values forming the basis of organizational culture. According to this study, 'strong unity' is the core value which the owner family in Chosun Ilbo has ever been spotlighting. As long as the strong unity is stressed, the role playing as members of news organization for its interest is more highly regarded than carrying out the normative missions given unto the journalists in general.

• Magazine of the Korean Society of Agricultural Engineers
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• v.45 no.3
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• pp.29-40
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• 2003

The objective of the paper is to compute the half-month rainfall-runoff erosivity factor for revised universal soil loss equation (RUSLE). RUSLE is being used to develop soil conservation programs and identify optimum management practices. Rainfall-runoff erosivity factor (R) is a key input parameter to RUSLE. Rainfall-runoff erosivity factor has been calculated for twenty six stations from the nationwide rainfall data from 1973 to 2002 in south Korea. The average annual Rainfall-runoff erosivity factor at the analyzed stations Is between 3,130 and 10,476 (MJ/ha)ㆍ(mm/h). According to the computation of the half-month Rainfall-runoff erosivity factor for locations, 66-85% of the average annual R value has occurred during the summer months, June-August. The half-month R values from this study can be used for RUSLE.

• The Journal of the Korea Contents Association
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• v.11 no.12
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• pp.690-699
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• 2011

Green Design is mostly discussed in the field of industry design on the concept basis, while less attention to environmental issues have been paid by neither designer nor manufacturer, which thereby adds to the necessity of the study on Green Design methods and process to a great extent. This article through the classification and analysis of DFX, researches on which kinds of designs in the Clock products market are invested with green design concept as piloted by the principle of DFMs, DFR, DFA and DFD. DFX means design for excellence, and also "design for X", where X is a variable with many values. Under the label Design for X, a wide collection of specific design guidelines are summarized. This article conducts DFX principle assessments on Clock by selecting 30 products of Clock market varieties as the samples, and conducts the field design practices centering on those materials of the least conformity with green design tenet amidst the Framework assessment results. In the course of field practices, DFMs principle is introduced, and embodies the significance of DFX method guidance by virtue of the ultimate results of conceptual designs conducted in the guidance of theoretical basis.

• Journal of KIISE:Computing Practices and Letters
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• v.14 no.5
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• pp.532-536
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• 2008

In this paper, we propose the method to measure tensions of character motions, using LMA (Laban Movement Analysis). Using tension values, we tan take advantage of them as a standard for synchronization of motion and BGM(Back Ground Music). In LMA, a motion is divided into 4 space-time factors which are called Efforts, and each Effort has two bases opposed to each other. We can analyze the motion by justifying which basis is stronger than the other in each Effort of motion. To measure quantitatively tension values, we propose some equations based on kinematics and dynamics. Then we can measure the tension value by the weighted sum of values calculated from those equations. Each weight can be determined by the optimization process which tries to minimize the difference between the calculated tension value and human's decision. The experimental result shows that the in creasing order of the motion tension value is similar to that of the tension score given by human.

• Journal of KIISE:Computing Practices and Letters
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• v.6 no.2
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• pp.265-273
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• 2000

In relational database management systems(RDBMS), a table consIn relational database management systems(RDBMS), a table consists of sets of records which are composed of a set of attributes. The number of distinct values(NDV) of an attribute denotes the number of distinct attribute values that actually appear in the database records, and is widely used in optimizing queries and supporting statistic queries. Object-relational database management systems(ORBBMSS), however, support the inheritance between tables which enforces an attribute defined in a super-table to be inherited in sub-tables automatically. Hence, in ORDBMSS, not only NDV of an attribute In a single table but also NDV of an attribute in multiple tables(HNDV) is needed. In this paper, we propose a method that calculates HNDV using arrays of attribute value intervals. In this method, an array of attribute value intervals is created for an attribute of interest In each table in a table hierarchy, and HNDV can be calculated or estimated by merging the arrays of attribute value intervals. The proposed method accurately calculates HNDV using small additional storage space and is efficient for an environment where only some of the tables in a table hierarchy are frequently updated.