• International Journal of Aeronautical and Space Sciences
• /
• v.14 no.3
• /
• pp.256-263
• /
• 2013

The saturation of the actuator impairs the response performance of the near space interceptor control system. A control system based on the properties of linear tracking system is designed for this problem. The properties are that the maximum value of the pseudo-Lyapunov function of the linear tracking control system do not present at the initial state but at the steady state, based on which the bounded stability problem is converted into linear tracking problem. The pseudo-Lyapunov function of the linear tracking system contain the input variables; the amplitude and frequency of the input variables affect the stability of the nonlinear control system. Designate expected closed-loop poles area for different input commands and obtain a controller which is function of input variables. The coupling between variables and linear matrices make the control system design problem non-convex. The non-convex problem is converted into a convex LMI according to the Shur complement lemma and iterative algorithm. Finally the simulation shows that the designed optimal control system is quick and accurate; the rationality of the presented design techniques is validated.

• International conference on construction engineering and project management
• /
• 2005.10a
• /
• pp.662-666
• /
• 2005

Using data gathered from expert opinion of plant and equipment professionals; this paper presents the key variables that may constitute a maintenance proficient plant operator. The Multivariate Discriminant Analysis (MDA) was applied to generate data and was tested for sensitivity analysis. Results showed that the MDA model was able to classify plant operators' proficiency at 94.10 percent accuracy and determined nine (9) key variables of a maintenance proficient plant operator. The key variables included: i) number of years of experience as equipment operator (PQ1); ii) eye-hand coordination (PQ9); iii) eye-hand-foot coordination (PQ10); iv) planning skills (TE16); v) pay/wage (MQ1); vi) work satisfaction (MQ4); vii) operator responsibilities as defined by management (MF1); viii) clear management policies (MF4); and ix) management pay scheme (MF5). The classification procedure of nine variables formed the general model with the equation viz: OMP (general) = 0.516PQ1 + 0.309PQ9 + 0.557PQ10 + 0.831TE16 + 0.8MQ1 + 0.0216MQ4 + 0.136MF1 + 0.28MF4 + 0.332MF5 - 4.387

• Journal of Digital Convergence
• /
• v.18 no.3
• /
• pp.207-215
• /
• 2020

This purpose of this study was to investigate sense of self-control, depression and factors influencing on state-anxiety in pregnant women and to identify factors influencing state-anxiety. Data were collected 160 pregnant women. Data were analyzed using ANOVA, t-test, Scheffe's test, Pearson's correlation coefficient, Stepwise Regression Analysis. There was statistically significant difference in sense of self-control on variable such as income. There were statistically significant difference in depression on variables such as occupation, living together with family-in-laws, planned pregnancy. There were statistically significant difference in state-anxiety on variables such as age, history of childbirth. State-anxiety was positively correlated with depression. State-anxiety was negatively correlated with sense of self-control. Depression was negatively correlated with sense of self-control. Factor influencing State-anxiety were sense of self-control, depression and history of childbirth, which explained 51.4%. Therefore, prenatal management programs need to be developed giving consideration to the emotional change in order to promote psychological stability in the pregnant women.

• Korean Journal of Psychosomatic Medicine
• /
• v.11 no.2
• /
• pp.205-213
• /
• 2003

Objectives: The authors intended to evaluate long-term outcome of group cognitive behavioral therapy(GCBT) for panic disorder and examined the variables to predict high end-state functioning in 12 months follow-up. Methods: 236 patients meeting DSM-IV criteria for panic disorder were assessed by STAI, ASI, BDI, BSQ, PBQ, ACQ at pre & post treatment, and were asked about the frequency of panic attacks during recent one month. We executed stepwise discriminant analysis on the clinical variables at pre treatment assessment to find the variables for discriminating between high end-state function(HES) and low end-state function(LES). Results: After GCBT, 82.6% of panic patients maintained high end-state functioning at 12 months follow-up. The results of discriminant analysis showed that BDI and BSQ at pre treatment assessment were significant variables to predict end-state functioning at 12 months follow-up. The hit ratio of discriminant analysis was 69.2%. Conclusion: These results suggest that the therapeutic effect of GCBT can be maintained through 12 months. Especially, it is likely that patients who were less depressed and who had less experienced the fear of physical symptoms at pre-treatment can maintain HES.

• 한국노년학
• /
• v.29 no.2
• /
• pp.547-562
• /
• 2009

The purpose of this study was to identify correlations between physical satisfaction and self-esteem of elderly women so as to provide information for finding out ways of developing their self-esteem. The subjects of this study were 387 elderly women in S city. The statistics used for data analysis were frequency, percentage, mean, standard deviation, reliability and multiple regression analysis through the SAS package program. The results of this study were as follows : 1) The physical satisfaction of elderly women were 11.6 which was low, And the self-esteem were 36 which was high. 2) The variables related to physical satisfaction were age, education, health state, income, economic state, household and religion. The variables related to self-esteem were spouse, household, religion, education, health state, income, economic state, physical satisfaction and age. 3) The variables affecting physical satisfaction were health state, income, spouse. The variables affecting self-esteem were physical satisfaction, economic state, age, household and religion.

• The Journal of Asian Finance, Economics and Business
• /
• v.7 no.6
• /
• pp.409-416
• /
• 2020

The research has been conducted to explore the combination of three intangible resources, including social capital, entrepreneurship, and resilience capability on the performance of State Capital Enterprises (SCEs) in Vietnam. Both qualitative and quantitative approaches are applied in the study. An in-depth interview of ten CEOs at SCEs in Vietnam was made to explore new indicators for the contextual latent variables in the research models. By employing the data from the authors' survey of 568 SCEs in Vietnam in 2019, using Cronbach's alpha, confirmatory factor analysis (CFA) and path analysis (SEM), the mechanism that social capital impacts on SCE performance has been analyzed. In addition to the direct role, social capital indirectly affects corporate performance through entrepreneurship and resilience capability. It was found that social capital has a larger impact on entrepreneurship than resilience capacity. However, the contribution of resilience capacity to the firm performance is much more than the entrepreneurship's in Vietnamese context. This study enriches the theory by proposing a measurement scale of the contextual latent variables as a result of in-depth interviews with experts using a qualitative analysis technique. In addition, the path analysis findings suggest practical implications for managers to effectively use their resources in SCEs.

• The Journal of Korean Academic Society of Nursing Education
• /
• v.18 no.2
• /
• pp.343-352
• /
• 2012

Purpose: The purpose of this study was to identify the factors influencing Health Promotion Lifestyle Profile of women college students. Methods: The sample consisted of 248 women college students in P city. Self report questionnaires were used to measure the variables. In data analysis, SPSSWIN 20.0 program was utilized for descriptive statistics, Pearson's correlation coefficients, and regression analysis. Results: The mean score for Health Promotion Lifestyle Profile was 2.27. In the the highest subcategories, the highest degree of performance was interpersonal relationships and the lowest degree was health responsibility. Health Promotion Lifestyle Profile was significantly different according to religion (F=3.48, p=.017), economic state(F=3.01,p=.031), perceived health state(F=8.07, p<.001), exercise frequency (F=16.02, p<.001), and self-rated knowledge about health (F=21.08, p<.001). In regression of analysis, perceived health state, exercise frequency, and self-rated knowledge about health were significant predictors explaining 30.5%. Conclusion: This study suggests that perceived health state, exercise frequency, and self-rated knowledge about health are significantly influencing factors in Health Promotion Lifestyle Profile in women college students. Therefore, the strategies of nursing intervention which improve these variables must be developed for women college students.

• KSII Transactions on Internet and Information Systems (TIIS)
• /
• v.12 no.8
• /
• pp.3888-3910
• /
• 2018

As an increasing number of defense methods against control-data attacks are deployed in practice, control-data attacks have become challenging, and non-control-data attacks are on the rise. However, defense methods against non-control-data attacks are still deficient even though these attacks can produce damage as significant as that of control-data attacks. We present a method to defend against non-control-data attacks using influence domain monitoring (IDM). A definition of the data influence domain is first proposed to describe the characteristics of a variable during its life cycle. IDM extracts security-critical non-control data from the target program and then instruments the target for monitoring these variables' influence domains to ensure that corrupted variables will not be used as the attackers intend. Therefore, attackers may be able to modify the value of one security-critical variable by exploiting certain memory corruption vulnerabilities, but they will be prevented from using the variable for nefarious purposes. We evaluate a prototype implementation of IDM and use the experimental results to show that this method can defend against most known non-control-data attacks while imposing a moderate amount of performance overhead.

• Proceedings of the KIEE Conference
• /
• 1998.07f
• /
• pp.1872-1875
• /
• 1998

In the industrial motor drive system, a shaft torsional vibration is often generated when a motor and a load are connected with a flexible shaft. This paper treats the vibration suppression control of such a system. Recently, there are new methods which estimate unknown state variables by using a reduced order observer and feedback these state variables by using a pole placement design method. But there is a trade-off between the fast command following property and the attenuation of disturbances and vibrations in these design methods. In this paper, the vibration suppression control of a two-mass system using a reference model is proposed. Because of using a reference model, the proposed control satisfy the fast command following property and the attenuation of disturbances and vibrations. Control parameter can be changed to maintain high system performance in control using a reference model. Experimental results show the validity of the proposed state feedback control using a reference model, and this controller is compared with the state feedback controller.

• Korean Journal of Human Ecology
• /
• v.4 no.1
• /
• pp.1-10
• /
• 2001

The purpose of the study was to investigate relationships among self-esteem of the elderly men and women in the economic state, health state, and degree of sex role identity. The subjects were 246 elderly men and women living in Chonnam. Statistics were Frequency, Percentage. Mean, Standard Deviation, Cronbach's ${\alpha}$, ANOVA and Regression analysis. Major results obtained were as follows ; 1) The mean scores of self-esteem in the elderly men and women were 19.26 and 18.84 respectively 2) There were meaningful differences in self-esteem according to health state. economic state. sex role identity in both elderly men and women. And. in the elderly men and Women. the highest influencing variables on their self-esteem were the economic state and health state, and the sex role identity respectively.