• Journal of dental hygiene science
• /
• v.7 no.2
• /
• pp.81-87
• /
• 2007

This study, taking the children with a disorder as the subject, has an object of making an comparative analysis on the dental status according to a degree of recognition on dental hygiene and to the actional factors of home dental hygiene to search for its improving measure. As its analytical method, with the use of SPSS, I used a cross analysis and percentage to take statistics on them. 1.The higher educational level a child with a mental order has, the higher frequency of brushing teeth he(she) has. And then the higher monthly income resulted in the higher frequency of brushing teeth. 2. In a teeth inspection according to the times of snack-eating of a child with a mental disorder, there was a statistics that according to whether the child's mother has a job or not, the times of snack-eating is different. 3.In analyzing the importance of the education of dental hygiene according to the parents' social characteristics, he answered to participate in an educational program for dental hygiene.

• Smart Structures and Systems
• /
• v.9 no.6
• /
• pp.505-534
• /
• 2012

The present work deals with second order statistics of post buckling response of piezoelectric laminated composite cylindrical shell panel subjected to hygro-thermo-electro-mechanical loading with random system properties. System parameters such as the material properties, thermal expansion coefficients and lamina plate thickness are assumed to be independent of the temperature and electric field and modeled as random variables. The piezoelectric material is used in the forms of layers surface bonded on the layers of laminated composite shell panel. The mathematical formulation is based on higher order shear deformation shell theory (HSDT) with von-Karman nonlinear kinematics. A efficient $C^0$ nonlinear finite element method based on direct iterative procedure in conjunction with a first order perturbation approach (FOPT) is developed for the implementation of the proposed problems in random environment and is employed to evaluate the second order statistics (mean and variance) of the post buckling load of piezoelectric laminated cylindrical shell panel. Typical numerical results are presented to examine the effect of various environmental conditions, amplitude ratios, electrical voltages, panel side to thickness ratios, aspect ratios, boundary conditions, curvature to side ratios, lamination schemes and types of loadings with random system properties. It is observed that the piezoelectric effect has a significant influence on the stochastic post buckling response of composite shell panel under various loading conditions and some new results are presented to demonstrate the applications of present work. The results obtained using the present solution approach is validated with those results available in the literature and also with independent Monte Carlo Simulation (MCS).

• Korean Journal of Occupational Health Nursing
• /
• v.12 no.2
• /
• pp.134-145
• /
• 2003

Purpose: The present study examines symptoms of VDT syndrome perceived by those nurses reviewing the application of health insurance at hospitals. This study also investigates those factor influencing on the experience of VDT syndrome among those nurses. Method: Data were collected through mail questionnaire survey in April, 2003. Of the 250 questionnaires disseminated, 214 questionnaires were finally analyzed using descriptive statistics and multiple regression analysis through SPSS/PC version 10.0. Result: Of the VDT syndrome, the musculoskeletal symptom score was highest, followed by ophthalmologic symptoms. The musculoskeletal symptoms were higher among younger nurses, having smaller space under the desk, and feeling uncomfortableness of the chair. The ophthalmologic symptoms were higher among those with a bachelor's degree, younger nurses, and those having a light reflection on the computer monitor, and those maintaining less than 40cm between eyes and the monitor. Higher dermatologic symptoms were observed among younger nurses and those using unclear monitor. The psychological symptoms were higher among younger nurses, those having a light reflection on the monitor, those unable to control the height of their chair, and those using uncomfortable chair. The overall symptoms were higher among younger nurses, those having a light reflection on the monitor, and those smaller space under the desk. Conclusion: Primary intervention should be given to those nurses with symptoms of VDT syndrome in order to regain health and prevent further aggravation of the symptoms. In particular, self-care behaviors of the nurses using VDT should be promoted with administrative support.

• Journal of the Korean housing association
• /
• v.3 no.2
• /
• pp.63-74
• /
• 1992

This study to providing scientific information that can help the management staff in apartment house. For the purpose of this study, questionaire depends on the consultation of concerned reference and by direct interview with chief of management-office. It composed to question in order to residant's satisfaction and demand of management Question are were administered to 279 APT. residants living in Seoul, Pusan and Ulsan. Data were analized by the SPSS+PC. The statistics used were frequency, mean, X2, principal component analysis. The major findings obtained from this stuby are as follows: First, the work of the domestic apartment house was classified into two types: 1) administration management 2) maintenance managementSecond, in the case of maintenance management, residants' satisfaction is higher to higher residants' demand.

• Communications for Statistical Applications and Methods
• /
• v.5 no.2
• /
• pp.539-557
• /
• 1998

This article is concerned with the problem of estimating the mean of a one-parameter exponential family through sequential sampling in three stages under quadratic error loss. This more general framework differs from those considered by Hall (1981) and others. The differences are : (i) the estimator and the final stage sample size are dependent; and (ii) second order approximation of a continuously differentiable function of the final stage sample size permits evaluation of the asymptotic regret through higher order moments. In particular, the asymptotic regret can be expressed as a function of both the skewness $\rho$ and the kurtosis $\beta$ of the underlying distribution. The conditions on $\rho$ and $\beta$ for which negative regret is expected are discussed. Further results concerning the stopping variable N are also presented. We also supplement our theoretical findings wish simulation results to provide a feel for the triple sampling procedure presented in this study.

• Journal of Korean Society for Quality Management
• /
• v.38 no.1
• /
• pp.42-51
• /
• 2010

For the fractional factorial designs, the resolution-IV designs can be used when we want to estimate the main effects and to investigate the structure of the non-negligible two-factor interaction effects, when the three-factor and higher order interaction effects are all negligible. However we need to add the additional treatment combinations in order to identify the influential interactions for the resolution-IV fractional factorial designs. In this paper we investigate the statistical structure for 3-level resolution-IV designs constructed by fold-over scheme and introduce a method for analyzing the influential two-factor interactions.

• Proceedings of the Korean Society for Quality Management Conference
• /
• 2010.04a
• /
• pp.129-138
• /
• 2010

For the fractional factorial designs, the resolution-IV designs can be used when we want to estimate the main effects and to investigate the structure of the non-negligible two-factor interaction effects, when the three-factor and higher order interaction effects are all negligible. However we need to add the additional treatment combination in order to identify the influential interactions for the resolution-IV fracrtional factorial designs. In this paper we investigate the statistical structure for 3-level resolution-IV designs constructed by fold-over scheme and introduce a method for analyzing the influential two-factor interactions.

• Korean Journal of Childcare and Education
• /
• v.14 no.4
• /
• pp.25-41
• /
• 2018

Objective: The purpose of this study was to examine the effects of parent-teacher relationships on mothers' parenting efficacy especially for toddlers. Methods: 225 mothers of toddlers completed questionnaires on parent-teacher relationships and parenting efficacy. This study used technical statistics, Pearson's correlation analysis, and multiple regression analysis in order to analyze the collected data. Results: First, there was a significant correlation between parent-teacher relationships and mothers' parenting efficacy. Second, the parent-teacher relationships was an important factor in predicting mothers' parenting efficacy. In particular, when a teacher and mother develop practical collaboration for caring for and educating a child, the mothers' parenting efficacy was higher. Conclusion/Implications: These findings indicate that the parent-teacher relationship is a significant factor in order to improve the quality of parenting. The results especially support the importance of collaboration between teachers and parents and suggest that we need to find practical ways for collaborating in the field. Limitations of this study and implications for future research were discussed.

• The Korean Journal of Applied Statistics
• /
• v.35 no.3
• /
• pp.395-406
• /
• 2022

This paper studies the outlier detection method for multivariate long memory time series. The existing outlier detection methods are based on a short memory VARMA model, so they are not suitable for multivariate long memory time series. It is because higher order of autoregressive model is necessary to account for long memory, however, it can also induce estimation instability as the number of parameter increases. To resolve this issue, we propose outlier detection methods based on the VHAR structure. We also adapt the robust estimation method to estimate VHAR coefficients more efficiently. Our simulation results show that our proposed method performs well in detecting outliers in multivariate long memory time series. Empirical analysis with stock index shows RVHAR model finds additional outliers that existing model does not detect.

• Journal of Korean Clinical Nursing Research
• /
• v.17 no.2
• /
• pp.138-149
• /
• 2011

Purpose: The objective of this research was to explore levels of patient safety and safe nursing activities depending on the level of nurse staffing, in order to provide effective management of nurse personnel. Methods: The research was conducted with 455 nurses from eight hospitals in B city. Data were collected according to the level of nurse personnel from second (nurse vs. patient ratio of 2.0-2.5) to fifth (ratio of 3.5-4.0) rank. The survey tools were, 'Questionnaire on Patient Safety, a Hospital Survey on Patient Safety Culture developed by AHRQ (2007), and 'Questionnaire on Patient Safety Nursing Act, in which the questions were selected from nursing-related items (Medication 6 & Safety Nursing Assurance Act 4) in the Safety Evaluation developed by Evaluation Institute of Medical Institution. Data were analyzed with SPSS PC 12.0 program using descriptive statistics, $x^2$ test, ANCOVA and $Scheff{\grave{e}}$. Results: The nurses' overall cognition level on patient safety and safe nursing activities showed that nurses who are in the second and third rank had higher scores than those in lower ranks. Conclusion: The results of this study indicate that hospitals need a higher ratio level for nurse personnel in order to assure patient safety and safe nursing activities.