• 전기의세계
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• v.25 no.5
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• pp.70-74
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• 1976

In this paper, the problem of controlling deterministic contimuous linear system with a slightly modified quadratic performance criteria is studied. When the number of out put variables is much lesser then that of state variables, either the controller becomes complex or the performance measure becomes much higher with only output feedback. So the design philosphy treated in this paper lies in finding a compromising point between the controller complexity and the performance measure. thd controller is composed of stasic plus dynamic compensator with order equal to the mtmber of output variables. Several unknowns are unknown parameters are bundled into one, and using Pontryagin's minimum principle, conditions and formula for optimum control are induced which are different from that of Kalman optimal regulator.

• Journal of Family Resource Management and Policy Review
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• v.22 no.1
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• pp.63-78
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• 2018

This study examined the insolvency of debtors using multiple-indicator approaches and compared the outcomes across income levels with the 2016 'Household Financial and Welfare Survey'. This study used (1) the total debt to total assets ratio (DTA), (2) the total debt service ratio (DSR), and (3) the Household Default Risk Index (HDRI) recently developed by the Bank of Korea. Households in the lowest income quintile were more likely to be insolvent than any other income group. Demographics, such as age and gender of the household head, and most of the financial variables significantly increased the likelihood of insolvency based on the DTA. The number of household members and job status increased the likelihood of insolvency based on the DSR. Also, age, gender of the household head, and most of the financial variables increased the likelihood of household insolvency based on the HDRI after controlling for other demographics and financial variables.

• Journal of Biosystems Engineering
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• v.25 no.1
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• pp.11-18
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• 2000

In precision chemical application increment of biological efficacy with less chemical is the virtue. spraying rate and droplet size is closely related to biological efficacy. this study was performed to develope a spray-control-system that could control spraying rate and droplet size independently. Twin-fluid nozzles were selected and tested to certify if the nozzles were suitable for the objective of this study. Characteritics of the nozzles i.e., spraying rte and droplet size change u8nder the changes of spraying pressure and air pressure were statistically modeled. The model had I to 1 matching property between dependent variables and independent variables. Using the property and the model, inverse relationship could be determined between variables. A feedback spray control system was developed and tested with predetermined error of 5 % in pressure. The system showed 4 % error in spraying rate and 9 % error in droplets size. Performance of the system could be upgraded by fine tuning but, in practical sense keeping air pressure in the field sprayer was the bottle neck of commercialization of the spray system.

• The Korean Journal of Applied Statistics
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• v.25 no.4
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• pp.589-603
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• 2012

Mahalanobis-Taguchi system(MTS) is a statistical tool for classifying the normal group and abnormal group in multivariate data structures. In addition to the classification itself, the MTS uses a method for selecting variables useful for the classification. This method can be used efficiently especially when the abnormal group data are scattered without a specific directionality. When the feedback adjustment procedure through the measurements of the process output for controlling process input variables is not practically possible, the reset procedure can be an alternative one. This article proposes a reset procedure using the MTS. Moreover, a method for identifying input variables to reset is also proposed by the use of the contribution. The identification of the root-cause parameters using the existing dimension-reduced contribution tends to be difficult due to the variety of correlation relationships of multivariate data structures. However, it became possible to provide an improved decision when used together with the location-centered contribution and the individual-parameter contribution.

• Journal of the Korean institute of surface engineering
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• v.44 no.1
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• pp.1-6
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• 2011

A NiW functional alloy plating was investigated as variables of metal ion concentration, complexing agent, temperature, pH and applied current density. Even if numerous studies on reaction mechanism of NiW induced codeposition were carried out during couples of decade, it has not been acceptable reaction mechanism. This study was focused on the effect of the plating variables on the alloy composition in the NiW alloy plating. Applied current density could control mainly the alloy composition rather than other plating variables. It has also been confirmed that the functional alloy plating such as layered or gradient plating was possible by controlling applied current density.

• SUVANNABHUMI
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• v.13 no.1
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• pp.65-87
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• 2021

This study attempted to investigate the effects of collectivism as an individual cultural value and leadership practices on employees' organizational commitment of six commercial banks in Vietnam. The study used collectivism and the implementation of five leadership practices as the independent variables, the three components of organizational commitment as the dependent variables and employees' personal factors served as controlling variables. The study utilized a quantitative method of research with questionnaires as the main data collection instrument. The findings of the study have revealed that the individual cultural value of collectivism positively, but to a marginal degree, affected the level of employees' organizational commitment. Among five leadership practices, only the implementation of encourage the heart, positively, but to a marginal degree, influenced employees' affective and normative commitment. The leadership practice of challenge the process had a negative impact on the employees' affective commitment. The personal factors of employees did not have an impact on organizational commitment. The findings and conclusions of this study may be used by the leaders to create the favorable working environment, improve the relationship between leaders and followers and to increase organizational commitment.

• Journal of Korean Academy of Nursing
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• v.34 no.2
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• pp.307-314
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• 2004

Purpose: This cross-sectional survey was undertaken to examine the differences of BSE (breast-self examination) performance and health beliefs between Korean and Korean-American women and to identify which factors influence the BSE based on the HBM variables. Method: The study subjects were recruited from both Korea(189 women) and Cleveland in Ohio, USA(I46 women). The HBM variables were measured using a reliable and valid Health Belief Model Scale. The subjects were also asked whether or not they did a BSE in the last year. Result: The Korean-American women who performed the BSE was statistically higher than that of Korean women. Regarding to the BSE-related health belief, the scores of benefits, confidence, and health motivation was significantly higher in Korean-American. After controlling for living places, age, education, and job, barriers and confidence variables significantly explained the BSE performance of Korean and Korean-American women. Conclusion: There was a differences in BSE-related health belief and performance between Korean and Korean-American women. Among health belief variables, barriers and confidence were core variables predicting the BSE performance of Korean and Korean-American women together.

• Korean Journal of Occupational Health Nursing
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• v.22 no.4
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• pp.314-323
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• 2013

Purpose: The purpose of this study was to figure out influences of supervisor's and colleague's supports, nursing work environment, ego-resilience, organizational commitment and burnout on turnover intention of nurses working in general hospitals. Methods: The data were collected from 379 nurses working in general hospitals with more than 500 beds in S city from July 1 to August 31, 2012. The collected data were analyzed with independent t-test, one-way ANOVA, Pearson's correlation and Hierarchial regression analysis by using SPSS 19.0. Results: In case the subject was young, with work experience of 1~5 years, single, female and position of general nurse, turnover intention was statistically significantly higher. Turnover intention, supervisor's support, nursing work environment, organizational commitment and ego-resilience showed significantly negative correlations, but burnout showed significantly positive correlations. In case of controlling general characteristics, higher correlational variables with turnover intention accounted for 30.2%. Conclusion: In order to reduce turnover intention of general nurses who showed higher intention with 1~5 years' work experience, situational variables such as organizational commitment and nursing work environment and interpersonal relation variables such as supervisor's support as well as personal variables such as ego-resilience should all be considered.

• Korean Journal of Human Ecology
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• v.8 no.2
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• pp.227-243
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• 1999

The purpose of this study was to analyze a causal relations of children's learned helplessness, stress, perception of self-competence and mother's childrearing attitudes. The subjects were 370 of 4th and 6th grade in elementary school and the second grade in junior high school in Busan and their's mothers. The instruments used for this study were learned helplessness scale, stress scale, self-perception profile for children, and childrearing attitude scale. The data was analyzed with pearson's correlation, multiple regression and path analysis. The major findings of this study were as follows : 1. Children's global self-worth, social self, age and mother's controlling childrearing attitudes predicted children's stress. 21% of the variance of children's stress was explained by these variables. 2. Children's stress, global self-worth, academic and social self predicted children's learned helplessness. 54% of the variance of children's learned helplessness was explained by these variables. 3. 1) Global self-worth was the first contribution and had a indirect effect through stress as well as a direct effect on children's learned helplessness. 2) Children's stress and academic self had direct effect on children's learned helplessness. 3) Children's social self had a indirect effect through stress as well as a direct effect on children's learned helplessness. 4) Mother's affectionate childrearing attitudes had indirect effect through academic, and social self and global self-worth on children's learned helplessness. Mother's controlling childrearing attitudes had indirect effect through stress on children's learned helplessness. Children's age had a indirect effect through global self-worth and stress and children's sex had a indirect effect through social self on children's learned helplessness.

• Journal of the Korean Home Economics Association
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• v.47 no.9
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• pp.71-82
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• 2009

The purpose of this study was to explore the effects of child gender and temperament, husbands’ support, and mothers’ psychological well-being on maternal parenting behaviors toward toddlers. Mothers of 214 toddlers responded to questionnaires on the following variables: child temperament, husbands’ support, psychological wellbeing and parenting behaviors. Hierarchical regression analysis revealed that: 1) Children being negative emotionality linked with mothers’ high controlling and rejective parenting behaviors and low responsive parenting behaviors directly and indirectly via mothers’ psychological well-being; 2) Husbands’ support was linked with mothers’ low controlling and rejective behaviors through mothers’ high psychological well-being; 3) Mothers’ low psychological well-being was linked to high mothers’ controlling and rejective parenting. The results of this study underscore mothers’ psychological well-being and husbands’ parenting support in predicting mothers’positive parenting.