• International Journal of Air-Conditioning and Refrigeration
• /
• v.10 no.4
• /
• pp.177-183
• /
• 2002

A pulsed tracer gas technique is applied to measure the distributions of local mean age and local mean residual-life-time of air in a half-scale experimental chamber, The airflow patterns in the chamber are visualized by a Helium bubble generator for three different exhaust locations. A supply slot is located at the top of a right wall, and an exhaust slot is at either bottom-left (Case 1), bottom-right (Case 2), or top-left (Case 3) location. Results show that the distributions of local mean age and local mean residual-life-time are different from each other, but both of them are closely related to the airflow pattern in the space. Included are discussions on explaining the variations of overall room ventilation effectiveness depending upon airflow rates for three different supply-exhaust configurations.

• Asian Oncology Nursing
• /
• v.6 no.2
• /
• pp.104-110
• /
• 2006

Purpose: This study was to investigate the satisfaction for voluntary activity and the meaning of life in hospice volunteers. Method: Data were obtained by self-reported questionnaire from 102 volunteers and were analyzed using a t-test, ANOVA and Pearson's correlation. Result: The mean score of the satisfaction for hospice volunteer activity was $2.48{\pm}0.38$. Of the domains of the satisfaction, the experience domain had the highest mean score $(2.93{\pm}0.53)$, and the social exchange domain had the lowest mean score $(1.65{\pm}0.63)$. The mean score of the meaning of life was $3.20{\pm}0.33$. The score of satisfaction was significantly different by economic status, and volunteering time per week. The score of meaning of life was statically different by financial status. There was a positive correlation between satisfaction for voluntary activity and the meaning of life. Conclusion: Satisfaction for hospice volunteer activity was significantly related to their meaning of life. In order to increase the satisfaction of volunteers, it is important to consider their financial aspect and the volunteering time.

• The Korean Journal of Rehabilitation Nursing
• /
• v.12 no.2
• /
• pp.112-119
• /
• 2009

Purpose: The purpose of this study was to investigate leisure activities, leisure life satisfaction, perceived health status and depression in the elderly and to examine the relationships among those variables. Method: The subjects were 204 elderly visiting a senior welfare service center in G city. Data were collected from September 14 to 18 in 2009. All subjects agreed to participate and filled out the survey questionnaire after signing the consent form. Results: 1) The mean score of leisure activities was 2.81; the mean score of leisure life satisfaction was 4.14; the mean score of perceived health status was 8.92; the mean score of depression was 5.13 and 42.2% of the subjects belonged to the depression group. 2) The level of leisure activities was significantly different according to education level, religion, spouse and pocket money. The level of leisure life satisfaction was significantly different according to religion and pocket money. The level of perceived health status was significantly different according to sex, education level and pocket money. The level of depression was significantly different according to spouse and pocket money. 3) Leisure activities showed positive correlation with leisure life satisfaction and perceived health status, but showed negative correlation with depression. Conclusion: These findings showed the need for the health promotion program that increases leisure activities and leisure life satisfaction without economic burden.

• Journal of Korean Public Health Nursing
• /
• v.9 no.2
• /
• pp.69-79
• /
• 1995

This study analyzed the relationship between stressful life events and state of mental health among middle class non working housewives and working housewives (104 pair) by age from June 5 to June 19, 1995 in seoul. The results of this study are as follows. 1. The degree of stressful life events was not statistically significant, but the degree working housewives group (Mean 1. 448) was higher than that of non-working housewives group (Mean 1.509). 2. The state of mental health showed statistically significant (p<. 01) the degree of non-working housewives group (Mean 7.36) was higher than that of working housewives (Mean 5.52). 3. The correlation between stressful life events and state of mental health showed natural in both non-Working housewives group (r=.497, p<.001) and working housewives (r=.532. p<.000), so increased stress is related to lower mental health. 4. The degree of stressful life events based on social psychological factor, showed statistically significant (p<.05) in the feeling of life, and the state of mental health was statistically significant in the part of feeling of life (p<.05) and subjective health state (p=.000)

• Wind and Structures
• /
• v.31 no.3
• /
• pp.217-227
• /
• 2020

Based on translation models, both Gaussian and non-Gaussian wind fields are generated using spectral representation method for investigating the influence of non-Gaussian characteristics and directivity effect of wind load on fatigue damage of wind turbine. Using the blade aerodynamic model and multi-body dynamics, dynamic responses are calculated. Using linear damage accumulation theory and linear crack propagation theory, crack initiation life and crack propagation life are discussed with consideration of the joint probability density distribution of the wind direction and mean wind speed in detail. The result shows that non-Gaussian characteristics of wind load have less influence on fatigue life of wind turbine in the area with smaller annual mean wind speeds. Whereas, the influence becomes significant with the increase of the annual mean wind speed. When the annual mean wind speeds are 7 m/s and 9 m/s at hub height of 90 m, the crack initiation lives under softening non-Gaussian wind decrease by 10% compared with Gaussian wind fields or at higher hub height. The study indicates that the consideration of the influence of softening non-Gaussian characteristics of wind inflows can significantly decrease the fatigue life, and, if neglected, it can result in non-conservative fatigue life estimates for the areas with higher annual mean wind speeds.

• Journal of Korean Public Health Nursing
• /
• v.15 no.2
• /
• pp.314-323
• /
• 2001

The purpose of this study was to investigate the levels of hope and the influencing factors on the hope in the hemodialysis patients. The subjects of this study consisted 101 patients who had received hemodialysis In two hospitals affiliated with Catholic University from June to August, 2000. The instruments used for the study were the Hope scale by Miller(1998) and Quality of life scale, Self esteem scale and Social support scale. Cronbach's $\alpha$ of measurement tools used in the study were 0.93 for the hope, 0.96 for quality of life, 0.78 for self-esteem and 0.92 for the social support. The data were analyzed by mean, t-test, ANOVA. Scheffe test, Pearson correlation coefficients and Stepwise multiple regression using the SAS program. The results were as follows; 1. Out of a score of 164 the mean score of the hope was $107.3\pm16.7$. The mean quality of life score was 102.5 out of 160. The scores concerning social support turned out to have a mean of 67.8 out of 100. The levels concerning self-esteem and self respect had a mean of 25.1 out of 40. 2. There was a positive relation between the quality of life and social support. Furthermore, the hope level was proportional to factors such as quality of life and social support. 3. Social support accounted for $32\%$ of influential variable on the hope. If transportation way to the hospital and quality of life were added. the total predictors explained $45\%$. The results suggested that the hope levels of hemodialysis patients were influenced by their social support and quality of life. Therefore nurses are encouraged to elevate the levels of patients' hope by using the social support and quality of life in caring the patients receiving hemodyalysis.

• Journal of the Korean Data and Information Science Society
• /
• v.8 no.2
• /
• pp.225-230
• /
• 1997

We, in this paper, propose an estimator of mean residual life function by using the residual survival function under random censoring and prove the uniform consistency and weak convergence result of this estimator. Also an example is illustrated by the real data.

• Journal of the Korean Statistical Society
• /
• v.25 no.1
• /
• pp.133-144
• /
• 1996

We, in this paper, propose a nonparametric estimator of bivariate mean residual life function based on Lin and Ying's (1993) bivariate survival function estimator of paired failure times under univariate censoring and prove the uniform consistency and the weak convergence result of this estimator. Through Monte Carlo simulation, the performances of the proposed estimator are tabulated and are illustrated with the skin grafts data.

• Journal of the Korean Data and Information Science Society
• /
• v.8 no.1
• /
• pp.99-109
• /
• 1997

The estimation procedure of mean residual life function has been placed an important role in the study of survival analysis. In this paper, the product limit estimator on left truncated and right censoring model is proposed with asymptotic properties. Also, the small sample properties are investigated through the Monte Carlo study and the proposed product limit type estimator is compared with ordinary Kaplan-Meier type estimator.

• Journal of the Korean Data and Information Science Society
• /
• v.2
• /
• pp.11-21
• /
• 1991

A different approach to the evaluation of mean residual life function under the random censorship model is presented. For small sample sizes, the performances between the proposed estimator and other estimators for men residual life function are compared in terms of bias and mean square error via a Monte Carlo study.