• Journal of Mechanical Science and Technology
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• v.19 no.10
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• pp.1846-1855
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• 2005

This paper presents a new stochastic controller applied on the vibration control system under irregular disturbances based on the mode selection scheme. Measured displacement and frequency characteristics are simultaneously used in designing a mode selecting controller. This technique is validated by applying to the suppression problem of a flexible beam with randomly vibrated circumstances. The presented method, called Mode Selecting Stochastic Controller, uses the frequency measurement of the flexible system based on a Fast-Fourier transformation algorithm. This controller is constructed by combining mode selection method with previous known Stochastic Controller in real time: Numerical simulations and several experiments are conducted to validate the proposed method. The performance of the proposed method is compared with a stochastic controller developed recently. This method was improved compared with previous one.

• Proceedings of the Korean Institute of Building Construction Conference
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• 2007.04a
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• pp.37-40
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• 2007

As a demand for underground structure is increasing with more parking and retail spaces required. Various construction methods are reviewed and selected for each specific site for economical and fast construction. In this study, factors for selecting construction methods were categorized for substructure construction. Construction processes of substructure are consisted of methods for excavation, earth retaining systems, and placement of slabs. Factors for the selection of substructure construction method are the condition of surrounding, geotechnical, information and constraint by comfortness for others nearby. After survey for the construction data of 5 different sites, analysis about reliable substructure construction selection method was suggested.

• Hwankyungkyoyuk
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• v.17 no.1
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• pp.133-143
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• 2004

This study aims to explore the ways in spreading and maturing of environmental Education(EE) in secondary school. To deal with this issue, researchers investigate the actual conditions of EE and grope for the ways in spreading and maturing of EE. According to investigation, the selecting rate of environment subject in secondary school is about 3%(compared selecting rate of other subject matters) in 2003. Based on the result, this study suggests followings. First, sequencing strategy of EE curriculum will be expected very efficaciously. Secondly, there is need to empasize daily experiences of EE beyond the formal subject matter. Thirdly and ultimately, thers is need to reform school curriculum centered EE. Moreover, there is need to empasize teacher education for the environment not only pre service but also in-service teacher training.

• International Journal of Quality Innovation
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• v.4 no.2
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• pp.16-31
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• 2003

A reducing variation of quality characteristics is a typical example of quality improvement. In such a case, we treat the quality characteristic, as a response variable and need to find active factors affecting the response from many candidate factors since reducing the variation of the response will be achieved by reducing variation of the active factors. In this paper, we first derive a method of selecting an active factor by linear regression. It is well known that correlation between factors deteriorates the precision of estimators. We, therefore, examine robustness of the selecting method against the correlation in the data set and derive an evaluation method of the deterioration brought by the correlation. Furthermore, some examples of selecting and evaluation methods are shown to demonstrate practical usage of the methods.

• The Journal of Asian Finance, Economics and Business
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• v.9 no.10
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• pp.97-104
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• 2022

The purpose of the existing work is to inspect the impact of knowledge management on organizational performance. Business experts now appreciate how important knowledge management is for organizational performance. Earlier studies have investigated the research model with causal linkages, however, only a few of them have considered sample-selecting bias problems when analyzing the model of knowledge management on organizational performance. The number of 312 executives related to knowledge management from 312 enterprises that have been approved with quality management systems offered suitable responses for analyses. The data was employed to investigate the effect of knowledge management on organizational performance, considering sample-selecting bias. The empirical outcomes indicate that sample-selecting bias exists in the causal impact of knowledge management on organizational performance. The empirical findings are helpful to scholars of knowledge management as well as business executives by giving an insight into the casual effect of knowledge management on organizational performance with the intervention of sample-selecting bias. The acceptance of knowledge management should be tailored to improve competitive advantages that will lead to better organizational performance.

• Journal of Korean Society for Quality Management
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• v.11 no.1
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• pp.24-29
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• 1983

A criterion is developed from the integrated sum of weighted squared bias and variance for use in selecting regressors. Some properties of this criterion are discussed and an example illustrating its use is included.

• Human Ecology Research
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• v.55 no.3
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• pp.221-232
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• 2017

This study analyzes the motivation for selecting child-care profession, job environment, director's transformational leadership associated with child-care center teacher's (lead teacher and head teacher) role performance. The subjects of this study were 336 teachers (lead teacher and head teacher) who worked in a child-care center located in Seoul and Gyeonggi-do. Data were collected through self-report questionnaires. Collected data were analyzed using the IBM SPSS Statistics ver. 23.0 program using t-test, F-test, analysis of variance, post-hoc analysis (Duncan), Pearson's correlation analysis, and multiple regression analysis. The results of the study are as follows. First, the study inquired on if the child-care center teacher's general characteristics (year) influence the child-care center teacher's role performance. Consequently, significant differences were not found in overall role performance according to teacher's career but not in the child-care center teacher's age, academic ability, and licensing. Second, the motivation for selecting profession (teaching aptitude, teacher's desire for social respect, and possibility of self-realization), job environment, and director's transformational leadership had a significant positive correlation with overall role performance. The motivation for selecting profession (without motives) had a significant negative correlation with overall role performance. Third, the strongest predictors of 'overall role performance' were teaching aptitude, variable of motivation for selecting child-care profession, and director's transformational leadership variable.

• Journal of the Korea Academia-Industrial cooperation Society
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• v.13 no.7
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• pp.2964-2970
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• 2012

The objective of this paper is to understand the characteristics of highschool students in selecting a career. The subject included 750 students from, who became a university student in 2011. The most of number of students answered that they applied to 3 to 4 universities and they decided their major and university on their last year of high school. Many placed weight on the major rather than the school. Among types of selecting career, family-type received the most voted. In selecting a major, the most answered that they consider their aptitude and then career opportunity. Most students said they were equipped with information and knowledge about the major they applied for beforehand. In selecting a university, many mainly applied for the ones with the highest chance of getting accepted. Many said they learned of the university from their high school/teacher or through the internet. A very few answered that they learned of the university through media such as TV/radio and newspaper. Therefore, appropriate information should be provided to the ones who have the greatest influence on students in selecting a career, family. Also, universities need to develop a promotion strategy that utilizes high schools as well as the internet and smartsphones.

• Journal of Science Education
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• v.37 no.2
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• pp.245-260
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• 2013

The purpose of the research is to examine the teachers' cognition about the math textbook selecting and to provide the implications about the rational process of the textbook selection and criteria based on the research. In terms of the research result about the inner and outer criteria of the actual process of the textbook selecting, they utilized the standard selection criteria distributed by Office of Education, and they considered 'Organization of learning contents' and 'Learning evaluation' as the most important factors. The selection method was that the answer 'After scoring the grade with matching standards, selecting by adding the total score' was the highest. In case of the actual selection, the most considerable inner criteria appeared 'Learning quantity and propriety of the difficulty level'. The outer criteria showed 'Awareness', and the difficulty in the selection process was 'in sufficient time for reviewing'. Based on this research result, we draw the implication that needs to be improved in the process of the textbook selection and the criteria.

• Communications for Statistical Applications and Methods
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• v.13 no.2
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• pp.267-272
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• 2006

A procedure for selecting regressors in the linear regression model is suggested using local influence approach. Under an appropriate perturbation scheme, the effect of perturbation of regressors on the profile log-likelihood displacement is assessed for variable selection. A numerical example is provided for illustration.