• 제어로봇시스템학회:학술대회논문집
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• 제어로봇시스템학회 1991년도 한국자동제어학술회의논문집(국내학술편); KOEX, Seoul; 22-24 Oct. 1991
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• pp.213-218
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• 1991

A new model which contains the dynamics of the motor system and the kinematics of the timing belt system is derived for an inverted pendulum system in FAPA Lab. Generalized standard compensator configuration(SCC) which contains the variable design parameters Kl, K2, .., K5 is proposed so that any desired design specification can be achieved. The robust controller which has robust property against the influence of sensor noise, system parameter variation and model uncertainty is designed minimizing the H$_{\infty}$-norm of transfer function from exogenous input to controlled output. The method of solving the two Riccati equations in state space and determining the controller uses on iteration method where the unique stabilizing solution to two algebraic Riccati equation must be positive definite and the spectral radius of their product less than .gamma.$^{2}$. Some cases are derived by varying the design parameter for simulation on a digital computer and experimenting the H$_{\infty}$- controller on an analog computer. The design parameters of controller which satisfies the desired control specification is selected on the basis of the simulation result and experimenting. The reasonableness and validity of the simulation and the robustness of the controller is established.d.

• 대한가정학회지
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• 제48권8호
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• pp.13-26
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• 2010

This study tested the path model with regard to how certain variables (control attribution, demand-control-support of activity, and control strategy) affected the elderly workers' subjective well-being(swb). In the path model, the exogenous variables were internal and external control attribution. We used demand-control-support of activity, and primary and secondary control strategies as mediating variables. The endogenous variable was each elderly worker's swb. Study participants were 205 elders participating in an "education activity". We used descriptive statistical analysis, Pearson's correlation and hierarchical multiple regression to examine data collected from structured interviews with the participants. Path analysis revealed the followings: First, secondary control strategy was the strongest predictor of participants' swb but internal control attribution, demand of activity, and support of activity also positively affected participants' swb. Second, internal control attribution indirectly affected the participants' swb. Finally primary control strategy negatively affected on the participants' swb.

• 한국식품조리과학회지
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• 제20권2호
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• pp.196-203
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• 2004

The current study addresses the issue of whether the extent of cooperation between purchase and production departments relied on the food-items management, purchase process and cook's own job satisfaction. A self-administered questionnaire comprised of 61 statements was presented to the anonymous cooks to assess their perception of inter-departmental cooperation. Also, we asked them to evaluate the performance of food-items management, satisfaction with purchase process, i.e. purchase process, food-items, food suppliers, and job satisfaction. Out of 367 responses, 342 (93.2%) were available for analysis. The demographic characteristics of the respondents are presented and six hypotheses were tested using SPSS 11.0 and AMOS 5.0. The structural equation analysis revealed that the departmental cooperation between purchase and production departments, the exogenous variable, was not directly related with the respondents' job satisfaction. However, it was indirectly related with the job satisfaction through the two endogenous variables: -satisfaction with purchase process and performance of food-items management.

• 간호행정학회지
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• 제22권4호
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• pp.362-372
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• 2016

Purpose: The aim of this study was to investigate whether job satisfaction in clinical nurses was dependent on work intensity and whether physical discomfort mediated the relationships between these variables. Methods: Structural equation modeling was used with a sample of 253 clinical nurses from four general hospitals. In the model, absolute work intensity, relative work intensity, and flexibility were considered as exogenous variables and physical discomfort as a mediating variable. Data were collected using self-report measures such as the Labor Intensity Questionnaire, the Rating of Perceived Exertion, and the Index of Job Satisfaction. Results: The results of the structural equation modeling found that the higher scores on absolute and relative work intensity were positively associated with physical discomfort but only relative work intensity was significantly related to job satisfaction. Physical discomfort mediated the relationships between absolute work intensity and job satisfaction and between relative work intensity and job satisfaction. Among three kinds of work intensity, only relative work intensity had direct and indirect effects on job satisfaction. Conclusion: The findings suggest that increase in relative work intensity might play an important role in decreasing job satisfaction in clinical nurses and a reasonable reward system considering relative work intensity could be necessary.

• 대한안전경영과학회지
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• 제17권3호
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• pp.53-63
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• 2015

This study highlights empirically the relationship among major constructs such as accident, fear and anxiety emotion, self-efficacy, and negative spillover of work, focused on the railway drivers. The differentiated factor of this study is in that the experience of accident was posed as exogenous variable. The main statistical tool was Regression. Hypothesis tests based on 201 samples verified that the experience of accidents showed a significant effect on negative spillover of work mediated by fear and anxiety, with moderating effect of self-efficacy between fear and anxiety and negative spillover of work. However, the moderating effect was shown as increasing the degree of negative spillover of work, since the drivers recognized their fear and anxiety accrued by accident experience as uncontrollable. This findings suggest the need for mitigating driver's negative emotion - fear and anxiety - through an introduction of practice such as exemption of settlement obligation in accident site and lowering of the penalty for accident responsibility.

• 대한간호학회지
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• 제49권3호
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• pp.241-253
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• 2019

Purpose: This study aimed to develop and test a model of the happiness of mothers with young children based on the stress-coping-adaptation model of Lazarus and Folkman. Methods: The data collection period was from May to July 2016. A self-report questionnaire was used to collect data from 210 mothers with children under 5 years of age living in Seoul, Gyeonggi, and Gangwon provinces. The exogenous variable was parenting stress, and the endogenous variables were parenting alliance, depression, optimism, ways of coping, and happiness. Data from 201 questionnaires were analyzed using the SPSS 22.0 and AMOS 20.0 programs. Data analyses included descriptive statistics, factor analysis, and structural equation modeling. Results: The final modified model showed a reasonable fit to the data, and out of 25 paths, 13 were statistically significant. This model explained 78.4% of the variance in the happiness of mothers with young children and confirmed that depression, optimism, parenting alliance, and social support-focused coping have a direct effect on the subject's happiness. Parenting stress also influenced happiness through parenting alliance, depression, and optimism. Conclusion: In order to bolster the happiness of mothers with young children, positive psychological interventions that can minimize psychological vulnerabilities, such as depression, and that can enhance their strengths, such as optimism, may serve as effective ways of coping with and adapting to stress.

• International journal of advanced smart convergence
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• 제10권3호
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• pp.172-180
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• 2021

The purpose of this study is to analyze the structural relationship among perfectionism and dance achievement of middle and high school students majoring in dance. Specifically, this study aims to investigate the effects of perfectionism on dance achievement through the medium of dance commitment and career decision-making self-efficacy. For this purpose, a structural equation model based on the previous studies was constructed with perfectionism as an exogenous variable and dance commitment, career decision-making self-efficacy, and dance achievement as endogenous variables. The final subjects of this study were 279 middle and high school students majoring in dance. The data were processed by frequency analysis to find out personal characteristics using SPSS 23 and exploratory factor analysis and reliability analysis were conducted on the research tools. In addition, AMOS 21 was used for confirmatory factor analysis, correlation analysis and structural equation model analysis. As a result of data processing on the research model. First, the sub-dimensions of perfectionism tendency 'worry about mistakes', 'personal standard', and 'doubt about behavior' had a statistically significant effect on dance commitment. Second, the sub-dimensions of perfectionism 'worry about mistakes', 'personal standard', and 'doubt about behavior' had statistically significant effects on career decision-making self-efficacy. Third, dance commitment did not have a statistically significant effect on dance achievement, but career decision-making self-efficacy had a statistically significant effect on dance achievement. These results provide implications.

• The Journal of Asian Finance, Economics and Business
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• 제8권5호
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• pp.761-768
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• 2021

The Islamic capital market in Indonesia is currently developing rapidly marked by the massive growth of sharia stock investors. It is followed by the development of an online sharia trading platform by stock brokerage companies so that investors can transact online sharia shares. From the number of existing stock investors, however, there are still very few Islamic stock investors who repurchase shares after the previous purchase. This really attracted the attention of researchers to investigate the repurchase intention of sharia share in the Indonesia stock market. 415 samples who are Islamic stock investors in the Indonesia stock market have filled out distributed questionnaires. Then, the data was processed using SEM Amos. The results of this study found that perceived enjoyment, perceived ease to use, and expectation have a positive and significant effect on investor satisfaction. Then, perceived enjoyment and expectation have a positive and significant effect on repurchase intention, while perceived ease to use has a negative and insignificant effect on repurchase intention, but has a positive effect through the mediating variable investor satisfaction. Investor satisfaction has a positive and significant effect on repurchase intention, and investor satisfaction is a good mediator for the exogenous variables in this study.

• The Journal of Asian Finance, Economics and Business
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• 제8권4호
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• pp.929-937
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• 2021

This present research seeks to explore the empirical evidence about the relation between quality of destination and Islamic attribute of destination on tourist satisfaction. This research was conducted at the tourism sector in West Java, Indonesia. The participants were Muslim foreign tourists who were traveling to West Java, Indonesia. The total number of participants in the research was 200. Data collection was carried out using a questionnaire. Hypotheses were tested using structural equation modeling methods with AMOS version 23. The exogenous variables in this research consisted of the quality of the destination and Islamic attribute of destination. Tourist satisfaction was an endogenous variable in this research. We used a quantitative approach and structural equation modeling to examine the research hypotheses. The results showed that there was a positive and significant effect of the quality of destination on the tourist satisfaction, and the quality of destination positively affected Islamic attribute of destination, but Islamic attribute of destination had no significant effect on tourist satisfaction. We also found that Islamic attribute of destination did not mediate the relation between quality of destination and tourist satisfaction. We provided recommendations to strengthen or improve the quality of destination in order to increase tourist satisfaction.

• The Journal of Asian Finance, Economics and Business
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• 제9권3호
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• pp.217-227
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• 2022

Predicting return and volatility in the global Capital Market during a pandemic is challenging, and it is more difficult for a specific sector, particularly if that sector has a positive outlook. The goal of this research is to look at the impact of COVID-19 on the mean and volatility of the Information Technology Indexes of the best nine technology-driven countries based on return performance using an econometric GARCH model that is widely used. The daily returns of information technology indexes are evaluated for the same from November 2018 to February 2021. Data is taken from Yahoo Finance for CAC Tech (France), DAX Tech (Germany), FTSE All Tech (UK), KOPSI 200 IT (Korea), NIFTY IT (India), S&P 500 IT (US), S&P TSX (Canada), SSE_IT (China) and TOPIX17 (Japan). The results show daily positive mean returns for 8 countries' IT Indices and further, an uptrend in mean daily returns is observed in the crisis period for 6 countries' IT Indices. The exogenous variable COVID-19 which was taken as a regressor for the GARCH model was found to be positively significant for IT indices of all the countries. The overall results confirm the presence of the mean-reverting phenomenon for IT indices of all the countries.