• 대한가정학회지
• /
• 제33권5호
• /
• pp.187-196
• /
• 1995

This study was performed was performed to identify the predictability of maternal attitude from infant's temperament and mother's mental stability. It was focused on the comparison of the degree of predictability between infant's temperament and mother's mental stability. Data were collected from sixty-five mothers of infants. Mother's affective attitude was explained by both the maternal mental stability and the infant's temperament. After controlling the effect of mental stability, infant's temperament could explain the affective attitude. This result meant that infant's temperament showed the powerful effect on the maternal affective attitude. However, maternal controlling attitude was only explained by her mental stability but not by infant's temperament. This meant that infant's temperament could not explain mother's controlling behavior. However, interactive effect between infant's sex and temperament was found in the controlling attitude. Mothers showed more controlling attitude toward the difficult boys but not toward the difficult girls.

• 제어로봇시스템학회:학술대회논문집
• /
• 제어로봇시스템학회 1997년도 한국자동제어학술회의논문집; 한국전력공사 서울연수원; 17-18 Oct. 1997
• /
• pp.692-695
• /
• 1997

Nonlinear robust attitude controller for 3-axis stabilized spacecraft is designed. Robust stability analysis for nonlinear spacecraft system with disturbance is conducted. External disturbances and parametric uncertainties decrease Spacecraft's attitude pointing accuracy. Sliding Mode Control(SMC) provides stability of system in the face of these disturbances and uncertainties. The concept of quadratic boundedness and quadratic stability are applied to the robust analysis for the nonlinear spacecraft system subject to bounded disturbance torques. Numerical simulation is conducted to compare the analysis result and actual nonlinear simulation. The simulation show that analysis result is valid.

• 제어로봇시스템학회:학술대회논문집
• /
• 제어로봇시스템학회 1992년도 한국자동제어학술회의논문집(국내학술편); KOEX, Seoul; 19-21 Oct. 1992
• /
• pp.469-473
• /
• 1992

The conventional closed-loop guidance commands are generated from a simplified point mass model for real time operations. In real situations, the generated guidance commands are applied to the original rigid body. This can cause attitude instability of the vehicle. In this paper, in order to solve the attitude instability problem in the guidance system sense, the influence of the guidance commands on a launch vehicle attitude is derived quantitatively. The checking method of the attitude stability conditions that uses Liapunov theorem is proposed, and the attitude stabilizing method is also proposed. The attitude stability is accomplished by subtracting the influence of the guidance commands that destabilize the vehicle attitude. The closed-loop guidance commands generated from the simplified point mass model may destabilize the vehicle attitude, which is verified through simulations. In this case, the vehicle attitude can be always stabilized with the proposed attitude stabilizing method without additive fuel consumption.

• 가정과삶의질연구
• /
• 제8권1호
• /
• pp.171-183
• /
• 1990

The purpose of this study is to search a tendency of marital stability, and to identify the variables influencing on marital stability of urban couples. The sample was selected from the married couples living is Seoul. Total sample consisted of 476 spouses(238 couples) finally selected datum sources. The data were analyzed by the statistical method such as the fator analysis, frequency distribution, percentile, ANOVA, Pearson's correlation, and χ2 test analysis. The main results were as follows ; 1) In general the score of marital stability of urban couples was somewhat high. 2) Among the related variables, socio-demographic variables such as Socio-Economic Status(SES), religion, social background have turned out to be significant on the marital stability, Also, marital satisfaction and attitude toward divorce influenced marital stability. 3) The important influential variables on the marital stability were in the order of marital satisfaction, attitude toward divorce, ears of marriage. 4) Four types of marital stability are identified based on marital satisfaction and attitude toward divorce. Among the surveyed couples, 39.7% showed the most ideal pattern in the sense that they show high scores on marital satisfaction and negative attitude toward divorce. On the other hand, 25.2% showed high psychological instability that they show low scores on marital satisfaction and positive attitude toward divorce. After all the most signigicant variable relating to marital stability was marital satisfaction.

• 대한가정학회지
• /
• 제9권2호
• /
• pp.1-16
• /
• 1971

The purpose of this research is to clarify the effect on personality of the child which may be infuenced by occupation and rearing attitude of the mother. Conclusion I. Mother with occupation does not give good effect on personality of the child, that is general Activity, Stability and Sociality. Conclusion II. Child attitude of mother effects greatly on personality of the child ; i.e. (a) good relationship between husband and wife makes good effects on the personality of the child ; and (b) rejecting attitude renders effects on the Stability of the child ; and (c) dominating attitude gives effects on Reflectiveness and Sociability of the child ; i.e. (d) overprotective attitude gives effect on Stability and Dominance of the child. Conclusion III. Whereas attitude of mother with occupation is dominaning, attitude of the mother without occupation is rejective. This difference in attitude gives effect on Reflectiveness, Dominance, Impulsiveness and Sociability of the child. Conclusion IV. Economic status of the famuly renders great effects on personality of the child, and this status effects Reflectiveness, Impulsiveness and Sociability.

• 한국우주과학회:학술대회논문집(한국우주과학회보)
• /
• 한국우주과학회 2007년도 한국우주과학회보 제16권2호
• /
• pp.135-138
• /
• 2007

The present work is to estimate the stability region of the State-Dependent Riccati Equation (SDRE) controlled system, which is used for a decentralized coordinated attitude control in satellite formation flying. In this research, currently emerging methods which estimate region of attraction for the SDRE controllers are introduced and the methods are applied to attitude control systems. The results guarantee the stability of the given decentralized coordinated attitude control system in satellite formation flying.

• 가정과삶의질연구
• /
• 제5권2호
• /
• pp.145-162
• /
• 1987

The purpose of this study is to investigate the relations between Wives' marital satisfaction and Divorce attitude as a basis building in marital stability . A measurement tools used for this study are marital satisfaction scale, which was adapted and reproducted from Dyadic Adjustment Scale(DAS) developed by Spanier and Divorce attitude Scale, which was developed by researcher refer to preceding study connected with a cause of divorce. The subjects were 354 married women dwelling in Seoul. Statistical methods such as frequency, percentile. mean , standard deviation, one way ANOVA, and Pearson Correlation were used for data analysis. The results of this study are as follows; 1) there is the tendency to high marital satisfaction group rather more than low marital satisfaction group and to permissional attitude group rather more than negative attitude group about divorce attitude. 2) There was difference in marital satisfaction by number of children, wives's educational level, parents marriage happiness. While, there was no difference in marital satisfaction by length of marriage, family income, wives employments status, marriage pattern. 3) There was partially difference in wives' attitude toward divorce by wives educational level, family income. Both there was no difference in wives attitude toward divorce by the other factors. 4) wives' attitude toward divorce correlates with marital satisfaction. The correlation coefficients is 283 significantly of .001 level. The more satisfaction wife feels about her own matrimony. the more negative a attitude she has toward divorce. This menas that attitude toward divorce depends upon their matrimony. 5) The four type of marital stability are as follows; high marital stability type, high subjective unstability type, high objective unstability type, high marital unstability type.

• 대한가정학회지
• /
• 제44권12호
• /
• pp.53-64
• /
• 2006

The purpose of this study was to investigate the variables on employees' retirement expectations divided into imposed frustration, new beginning, transition to rest, and continuing. Independent variables were individual(gender, age, occupation, income, education, and health condition), psychological(self-esteem, locus of control, attitude of leisure, and attitude of family), and job-related variables(job attitude, job satisfaction, and job stability). In order to achieve this purpose, a survey was conducted with 515 employees from Daegu and Kyungpook. Retirement expectations were measured with questionnaire based on several studies. The data analyzed by frequency, percentage, mean, factor analysis, Cronbach's $\alpha$, correlation, and multiple regression. The major findings were as follows. First, imposed frustration was affected by income, self-esteem, locus of control, job satisfaction, job attitude, and job stability. Second, new beginning was affected by self-esteem, locus of control, attitude toward leisure and family, and job stability. Individual variables were not statistically significant predictors of new beginning. Third, transition to rest was affected by locus of control, attitude toward family, job satisfaction, job attitude, and job stability. Individual variables were not statistically significant predictors of transition to rest. Finally, continuing was affected by age, education, job satisfaction. Psychological variables were not statistically significant predictors of continuing.

• Journal of Mechanical Science and Technology
• /
• 제15권6호
• /
• pp.743-751
• /
• 2001

A Prototype reaction wheel, named the Hankuk Aviation University (HAU) reaction wheel, has been developed for KAISTSAT satellite series. Torque and force disturbances are inherent in reaction wheels, and thus the force and torque characteristics should be examined for every newly developed reaction wheel. The torque and force disturbance noises in the prototype HAU reaction wheel are measured with a torque-measuring table developed for the present study. A new measuring procedure based on a simple principle is applied for the measurements. The frequency characteristics of the torque and force noises are analyzed by examining the power spectral density. The effect of the torque noise on the attitude stability is also examined through numerical simulations with a single-axis attitude model. The noise-induced attitude error and jitter and found to be well below the specified error limits for the KAISTSAT satellite series.

• 대한전자공학회:학술대회논문집
• /
• 대한전자공학회 1999년도 추계종합학술대회 논문집
• /
• pp.720-723
• /
• 1999

For that the attitude control performance test of the satellite, dynamic analysis of satellite structure performed in reference with KOREASAT, and the equation of motion of rigid bodies was derivated. For attitude stability, Lyapunov's stability theorem and state space expression were applied to dynamic equation of satellite. To prove efficiency of our method, simulations are performed and result are shown.