• Korean Journal of Applied Biomechanics
• /
• v.22 no.2
• /
• pp.237-242
• /
• 2012

The purpose of this study was (a) to develop carbon nanotube-based shock absorbers for reducing potentially harmful impact forces and excessive foot pronation, and (b) to briefly determine how the effects of carbon nanotube-based shock absorbers on biomechanical variance during drop landing. A university student(age: 24.0 yrs, height: 176.2 cm, weight: 679.5 N) who has no musculoskeletal disorder was recruited as the subject. Hardness, specific gravity, tensile strength, elongation, 100% modulus, tear strength, split tear strength, compression set, resilience, vertical GRF, and loading rate were determined for each material. For each dependent variable, a descriptive statistics was used for different conditions. The property test results showed that tensile strength, tear strength, split tear strength, compression set, and resilience in carbon nanotube-based shock absorbers were greater than general Ethylene Vinyl Acetate(EVA). These indicated that resistance against variable strength in developed carbon nanotube-based shock absorbers were greater than general EVA. In vertical GRF of CNTC was less than those of EVA during drop landing and loading rate of CNTC was greater than EVA. It seems that the use of CNT can be a effective way of reducing and controlling shock from impact.

• Transactions of the Korean Society of Automotive Engineers
• /
• v.21 no.3
• /
• pp.142-147
• /
• 2013

Over the past few years, intelligent tire is developed very actively for more accurate measurement of real-time tire forces generated during vehicle driving situation. Information on the force of intelligent tire could be used very usefully to chassis control systems of a vehicle. Intelligent tire is based on deformation of tire's inner surface from the waveform of a SAW, or Surface Acoustic Wave. The tire vertical force is estimated by using variance analysis of sensor signals. The estimated tire vertical force is compared with the tire vertical force generated during vehicle driving situation in real-time environment. The scope of this paper is a correlation study between the measured sensor signals and the tire vertical force generated during vehicle driving situation.

• Journal of the Korea Computer Industry Society
• /
• v.2 no.2
• /
• pp.203-210
• /
• 2001

To estimate relational models and test the theoretical hypotheses of binary tree search algorithms, we built binary search trees with random permutations of n (number of nodes) distinct numbers, which ranged from three to seven. Probabilities for building binary search trees corresponding to each possible height and balance factor were estimated. Regression models with variables of number of nodes, height, and average number of comparisons were estimated and the theorem of O(1g(n)) was accepted experimentally by a Lack of Test procedure. Analysis of Variance model was applied to compare the average number of comparisons with three groups by height and balance factor of the trees to test theoretical hypotheses of a binary search tree performance statistically.

• Journal of the Korean Institute of Electrical and Electronic Material Engineers
• /
• v.18 no.9
• /
• pp.856-862
• /
• 2005

A flux-lock type SFCL consists of two coils, which are wound in parallel each other through an iron core, and a HTSC thin film connected in series with coil 2. If the current of the HTSC thin film exceeds its critical current by the fault accident, the resistance generated of the HTSC thin film, and thereby the fault current can be limited by the impedance of the flux-lock type SFCL. The amplitude of fault current can be set by the impedance of the flux-lock type SFCL. In this paper, we investigated the variance of the limiting current due to the ratio of inductances between coil 1 and coil 2 in the flux-lock type SFCL through the computer simulations and short circuit tests. In addition, both the simulation results and experimental ones were compared each other. From the comparison of both the results, the simulation results agreed well with the experimental ones.

• Journal of Korean Academy of Nursing
• /
• v.41 no.6
• /
• pp.733-741
• /
• 2011

Purpose: The purpose of this study was to identify factors influencing maternal identity of Korean primiparas. Methods: The data were collected by a self-report questionnaire in 2006. The participants were 210 healthy primiparous women who delivered at one of three medical centers and revisited the outpatient department for follow up between 4 to 6 weeks after childbirth. Data were analyzed using the SPSS WIN 17.0 program with descriptive statistics, t-test, one way ANOVA, Pearson correlation coefficient, and stepwise multiple regression. Results: Maternal identity was significantly correlated with Taekyo accomplishment, the culturally based prenatal preparation (p<.001). Transitional gratification to motherhood (p<.001), postpartum depression (p<.001), childcare stress (p<.001), infant temperament (p<.001), and social support (p<.001) were also significantly correlated with maternal identity. The stepwise multiple regression analysis showed that maternal identity was significantly predicted by transitional gratification to motherhood, infant temperament, childcare stress, and Taekyo accomplishment. These variables explained 31.0% of the variance of maternal identity. Conclusion: The results of this study suggest that postpartum nursing interventions to promote maternal identity should focus on reinforcing education and support for reducing childcare stress and infant difficulty, and increasing transitional gratification to motherhood. Also, prenatal encouragement and education for improving Taekyo accomplishment may be helpful to promote maternal identity after birth.

• Journal of Computational Design and Engineering
• /
• v.3 no.1
• /
• pp.63-70
• /
• 2016

Deep drawing is a forming process in which a blank of sheet metal is radially drawn into a forming die by the mechanical action of a punch and converted to required shape. Deep drawing involves complex material flow conditions and force distributions. Radial drawing stresses and tangential compressive stresses are induced in flange region due to the material retention property. These compressive stresses result in wrinkling phenomenon in flange region. Normally blank holder is applied for restricting wrinkles. Tensile stresses in radial direction initiate thinning in the wall region of cup. The thinning results into cracking or fracture. The finite element method is widely applied worldwide to simulate the deep drawing process. For real-life simulations of deep drawing process an accurate numerical model, as well as an accurate description of material behavior and contact conditions, is necessary. The finite element method is a powerful tool to predict material thinning deformations before prototypes are made. The proposed innovative methodology combines two techniques for prediction and optimization of thinning in automotive sealing cover. Taguchi design of experiments and analysis of variance has been applied to analyze the influencing process parameters on Thinning. Mathematical relations have been developed to correlate input process parameters and Thinning. Optimization problem has been formulated for thinning and Genetic Algorithm has been applied for optimization. Experimental validation of results proves the applicability of newly proposed approach. The optimized component when manufactured is observed to be safe, no thinning or fracture is observed.

• Journal of Korean Academy of Nursing Administration
• /
• v.12 no.4
• /
• pp.555-563
• /
• 2006

Purpose: This study was aimed at examining the relationships of transformational and transactional leaderships that nurse managers demonstrate to creative activity that nurses excercise at caring for patients. Method: Using 11 items of the Creative Nursing Practice Index and 18 items of Multifactor Leadership Questionnaire Form, a descriptive study was conducted with a sample of 425 nurses working more than six months at nursingcare units in a university hospital of Korea. Data were analyzed, using independent t-test, ANOVA, Pearson correlation, and stepwise multiple regression analysis methods. Result: Creative activity had positive relationships to transformational leadership and transactional leadership(p<.01). The factor influencing on creative activity was not transactional leadership(p>.05), but transformational leadership(10.7%, p<.001). Intellectual stimulation accounted for 9.7% of information building-activity and 1.1% of idea creating & communicating idea. About 5.8% of the variance in idea validating-activity was explained by inspirational motivation, and 1.2% by contingent reward. Conclusion: For support for nurses' creative activity at work, leadership training programs would be needed to build up nurse manager's transformational leadership.

• Research in Community and Public Health Nursing
• /
• v.31 no.2
• /
• pp.156-165
• /
• 2020

Purpose: This study was performed to identify the factors influencing the fear of dementia in middle-aged and older adults. Methods: Data on the characteristics, dementia knowledge, dementia attitude, dementia health beliefs, and fear of dementia of 156 participants were collected from January 20 to March 22, 2018, using a structured questionnaire. The data were analyzed with the SPSS/WIN 21.0 program for descriptive statistics, using an independent t-test, one-way analysis of variance, Pearson's correlation coefficient, and stepwise multiple regression. Results: Significant factors associated with fear of dementia among middle-aged and older adults were subjective life satisfaction (F=3.72, p=.006) and regular exercise (t=6.05, p=.015). Fear of dementia has positive correlations with dementia attitude, perceived susceptibility, perceived severity, and perceived barrier. The determining factors affecting fear of dementia in middle-aged and older adults were perceived severity (β=.46, p<.001), followed by a perceived barrier (β=.20, p=.004) and perceived susceptibility (β=.17, p=.023), and the explanation power was about 47.8%. Conclusion: The results suggest that perceived severity, perceived barrier, and perceived susceptibility be considered in developing the nursing interventions to increase perceived severity, perceived susceptibility, and to decrease perceived barrier to dementia by evaluating dementia health beliefs to manage the fear of dementia among middle-aged and older adults.

• Child Health Nursing Research
• /
• v.23 no.1
• /
• pp.61-69
• /
• 2017

Purpose: The purpose of this study is to examine the relationship between social capital, labor intensity and incivility and effects the job burnout in pediatric nurses. Methods: A survey is conducted with 186 nurses working in pediatric units at 10 hospital in B, Y, K city. The data was analyzed with SPSS 21.0 program using descriptive statistics, t-test, ANOVA, Pearson's correlation coefficient, $Scheff\acute{e}s$ test and multiple linear regression analysis. Results: A score of 3.31 out of 5 for the level of social capital, a score of 3.16 out of 5 on the labor intensity, and 2.20 points on a 5point on incivility, 4.15 points on a 7 point on job burnout. Job burnout explained 21.7% of the variance in incivility, social capital-shared values, job satisfaction, and labor intensity. Conclusion: The findings indicate that the major factors effecting pediatric nurses job burnout are incivility. Thus, in order to reduce pediatric nurses job burnout are to investigate degree of incivility, it is nesessary to develop intervention programs to incivility and labor intensity that reduced organizational level of measures need to establish.

• The Journal of Korean Academic Society of Nursing Education
• /
• v.24 no.1
• /
• pp.61-71
• /
• 2018

Purpose: The purpose of this study is to explore subjective perceptions of good nurses' images perceived by nursing students using Q-methodology and to identify characteristics by types and reflect them in nursing education. Methods: Between December 21 and November 30, 2017, using Q-methodology, 31 nursing students from two universities sorted and rated 34 Q-statements on a nine-point scale according to the degree of their agreement. A data analysis was conducted using the PC-QUANL program. Results: The images of good nurses, as perceived by nursing college students, were extracted into three types, each of which had unique characteristics; the cumulative variance was 55%. Three types were identified as "Task-oriented health professional type," "Emotional companion type," and "Flexible mediator type" respectively. Conclusion: This study investigated the significant differences of subjectivity in images of good nurses perceived by nursing college students. The results of this study can be applied to the development and application of a nursing education curriculum that helps nursing college students form positive nursing images and grow into competent nurses.