• 제어로봇시스템학회:학술대회논문집
• /
• 1990.10b
• /
• pp.1060-1065
• /
• 1990

In general it is difficult to determine a Liapunov function for a given asymptotically stable, nonlinear differential equations system. But, in the system with control inputs, it is feasible to make a given positive function, except for a small area, globally satisfy the conditions of the Liapunov function for the system. We call such a positive function a Liapunov-like function, and propose a method of nonlinear optimal regulator using this Liapunov-like function. We also use the periodic Liapuitov-like friction that suits the system whose equilibrium points exist periodically. The relationship between the Liapunov function and cost function which this nonlinear regulator minimizes is considered using inverse optimal method.

• Journal of Korean Academy of Fundamentals of Nursing
• /
• v.19 no.3
• /
• pp.374-382
• /
• 2012

Purpose: The study was done to influence of family function and degree of depression on impulsive behavior in adolescents. Method: Using convenience sampling 780 adolescents were recruited from October 29 and November 9, 2011. Data were collected using self-report questionnaires which included items on general characteristics, family function, depression, and impulsive behavior. Data were analyzed using t-test, ANOVA, Scheffe test, Pearson Correlation Coefficient, and hierarchical regression analysis. Results: The major findings of this study were as follow; 1) There was a significant negative relationship between family function and impulsive behavior (r=-.236, p<.001) and a positive relationship between depression and impulsive behavior (r=.342, p<.001). 2) Factors with a significant negative association with impulsive behavior were higher school records (${\beta}$=-.112, p<.001) and family function: positive resolution of family problems (${\beta}$=-.213, p=.008), while a significant positive association was found for unsatisfactory school life (${\beta}$=.103, p=.016), family function: emotional reactivity (${\beta}$=.159, p=.028), and depression (${\beta}$=.301, p<.001). These variables explained 20.1% of variance for impulsive behavior. Conclusion: The results of this study identify a relationship between family function, depression, and impulsive behavior in adolescents indicating variables to be addressed to reduce impulsive behavior. These variables can be used in developing intervention programs.

• Korean Journal of Childcare and Education
• /
• v.16 no.5
• /
• pp.47-67
• /
• 2020

Objective: The main purpose of this study was to investigate the direct effect of maternal parenting behavior and indirect effects through preschoolers'executive function on three types of social behavior, prosocial, aggressive and withdrawn behavior. Methods: A total of 299 mothers and their preschool-aged children were the subjects of this study. Mothers completed the questionnaire that included measures of their parenting behavior, preschoolers' executive function, and social behavior. Results: First, mothers' positive parenting behavior had a direct effect on preschoolers' prosocial behavior, and mothers' negative parenting behavior had direct effects on preschoolers' aggressive and withdrawn behavior. Second, mothers' positive parenting behavior had indirect effects on preschoolers' prosocial, aggressive and withdrawn behavior through preschoolers' executive function. In contrast, indirect paths from maternal negative parenting behavior to social behavior through preschoolers' execution function were not significant. Conclusion/Implications: These findings underscore the importance of executive function during early childhood and suggest the need for effective parenting programs to promote executive function.

• PNF and Movement
• /
• v.18 no.2
• /
• pp.159-172
• /
• 2020

Purpose: The study sought to determine whether goal achievement, performance, satisfaction, activities of daily living, and gross motor function in children with spastic cerebral palsy are positive affected by goal-oriented functional task training. Methods: In a single case study, two 7-year-old girls diagnosed with spastic cerebral palsy were given functional task training based on individualized goals for 24 60-minute sessions over a period of 6 months. The individualized goals reflected the needs of both children and parents. The Canadian occupational performance measure (COPM) and the goal attainment scale (GAS) were used to measure goal performance and satisfaction before and after intervention. Independence of activities of daily living before and after intervention were assessed using the functional independence measure for children (Wee-FIM). And change of gross motor function were assessed using gross motor function measure (GMFM). Results: Clinically significant changes were observed in COPM and GAS, as well as positive changes in independence of gross motor function and activities of daily living. Conclusion: The findings indicate that goal-oriented functional task training addresses the needs of children with spastic cerebral palsy, which increases treatment satisfaction and has a positive effect on independent activities and participation in daily life.

• Bulletin of the Korean Mathematical Society
• /
• v.47 no.2
• /
• pp.251-261
• /
• 2010

This paper deals with a predator-prey model with Holling type III response function and cross-diffusion subject to the homogeneous Neumann boundary condition. We first give a priori estimates (positive upper and lower bounds) of positive steady states. Then the non-existence and existence results of non-constant positive steady states are given as the cross-diffusion coefficient is varied, which means that stationary patterns arise from cross-diffusion.

• East Asian mathematical journal
• /
• v.39 no.1
• /
• pp.29-36
• /
• 2023

In this paper, we consider φ-Laplacian nonlocal boundary value problems with singular weight function which may not be in L¹(0, 1). The existence and nonexistence of positive solutions to the given problem for parameter λ belonging to some open intervals are shown. Our approach is based on the fixed point index theory.

• Human Ecology Research
• /
• v.60 no.1
• /
• pp.99-113
• /
• 2022

This study examined the effect of maternal cognitive empathy on children's executive function focusing on mediating effects of preschooler's caring behavior and happiness. The subject of this study was 460 five-year-old preschooler-their mother dyads in Korea. Data were collected by Korean Version of Questionnaire of Cognitive and Affective Empathy(K-QCAE), Caring Behaviors Scale for Young Children, Happiness Scale for Young Children and Behavior Rating Inventory of Executive Function-Preschool Version(BRIEF-P). Data were analyzed using descriptive statistics, independent samples t-test, Pearson correlation analysis, structural equation model and bootstrapping test with SPSS 25.0 and AMOS 23.0 program. The major results were as follows. 1) Maternal cognitive empathy had a positive influence on preschooler's caring behavior. 2) Preschooler's caring behavior had a positive influence on happiness and executive function. 3) Preschooler's happiness had a positive influence on executive function. 4) The effect of maternal cognitive empathy on preschooler's executive function was mediated by preschooler's caring behavior. 5) The effect of maternal cognitive empathy on preschooler's executive function was sequentially mediated by preschooler's caring behavior and happiness. This study revealed that maternal cognitive empathy, preschooler's caring behavior, and happiness have an important role in preschooler's executive function. Most of all, we suggest that maternal cognitive empathy should be improved to promote preschooler's executive function. The findings of this study will contribute to designing intervention programs to improve preschooler's executive function as well as maternal empathy.

• Journal of the Korean Society of Marine Environment & Safety
• /
• v.12 no.2 s.25
• /
• pp.145-150
• /
• 2006

This paper proposes an analysis to image of Inchon port using fuzzy theory. After analysis, positive opinion is mean membership function 0.73 and positive membership function 0.27, negative opinion is mean membership function 0.69, negative membership function 0.31 about Inchon port development. therefore, for port development need to accomodation of each opinion positive opinion is maximum decrease from 20 age to 30 age. and negative opinion is maximum increase from 10 age to 20 age. According to the results, port development need to high positive image as leisure and development of waterfront and low negative image as integrated port management and strategy of considered environment port.

• East Asian mathematical journal
• /
• v.38 no.1
• /
• pp.33-41
• /
• 2022

In this paper, we study singular Dirichlet boundary value problems involving ϕ-Laplacian. Using fixed point index theory, the existence of positive solutions is established under the assumption that the nonlinearity f = f(u) has a positive falling zero and is either superlinear or sublinear at u = 0.

• The Journal of Korean Medicine
• /
• v.31 no.2
• /
• pp.109-113
• /
• 2010

Objectives: Liver function tests are used as screening tests for liver injuries, but their inaccuracy on positive predictive values can result in numerous false positive results. We investigated the incidence of liver function test abnormalities of patients who came to an oriental medicine hospital, in order to present a practical way to rule out false positive results for other studies designed to investigate the safety of Korean herb medicine. Methods: We analyzed the medical records and liver function test results proceeded at admission of all in-patients admitted to Jaseng Oriental Medicine Hospital, from July 2008 to June 2009. Results: Among 1,117 inpatients, 941 executed liver function tests on admission, and 40 were excluded due to their diagnosed liver disease. 747 (82.9%) of 901 enrolled patients were within the normal range of all liver function tests, and 140 (15.5%) and 14 (1.6%) were classified as "abnormalities of liver tests" and "liver injury" respectively, according to the CIOMS (Council for International Organizations of Medical Sciences) criteria. Conclusions: According to the results, among the outcomes of liver function tests proceeded among the patients admitted to the oriental medicine hospital, excluding who were diagnosed with liver disease, 17.1% showed abnormality. This means simple liver function test results are not sufficient in determining liver toxicity of Korean herb medicine (KHM).