• Proceedings of the Korean Society of Marine Engineers Conference
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• 2005.06a
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• pp.228-232
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• 2005

Automobiles are very important as modern society is developed. Increase of the number of the automobiles cause environmental problem, that is, air pollution. So, many countries are adopting a environmental law. Automobile manufacturing companies have developing methods to prevent air pollution with increase of the efficiency of automotive engines. PCV(Positive Crankcase Ventilation) system which is one of them is made by the closed loop that consists of combustion chamber, crankcase, manifold suction tube and manifold. PCV valve is attached on manifold tube to control the flowrate of blowby gas. PCV valve is an important part in this system but it is difficult to design PCV valve which satisfies the required flowrate of blowby gas. In this study, our purpose is to help a PCV valve designer with the development of a design program. We used 4th order Runge-Kutta method and Bernoulli's equation to analyze the spool dynamic motion. By the comparison between our program and experiment, we think that a PCV designer can use our program in their work place.

• Journal of Korean Academy of Nursing
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• v.47 no.3
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• pp.431-444
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• 2017

Purpose: This study was conducted to verify the effects of a memory and visual-motor integration program for older adults based on self-efficacy theory. Methods: A non-equivalent control group pretest-posttest design was implemented in this quasi-experimental study. The participants were 62 older adults from senior centers and older adult welfare facilities in D and G city (Experimental group=30, Control group=32). The experimental group took part in a 12-session memory and visual-motor integration program over 6 weeks. Data regarding memory self-efficacy, memory, visual-motor integration, and depression were collected from July to October of 2014 and analyzed with independent t-test and Mann-Whitney U test using PASW Statistics (SPSS) 18.0 to determine the effects of the interventions. Results: Memory self-efficacy (t=2.20, p=.031), memory (Z=-2.92, p=.004), and visual-motor integration (Z=-2.49, p=.013) increased significantly in the experimental group as compared to the control group. However, depression (Z=-0.90, p=.367) did not decrease significantly. Conclusion: This program is effective for increasing memory, visual-motor integration, and memory self-efficacy in older adults. Therefore, it can be used to improve cognition and prevent dementia in older adults.

• Journal of Korean Public Health Nursing
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• v.16 no.1
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• pp.148-164
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• 2002

This study was performed to investigate the conditions of physical activity and exercise programs in Public Health Center. For this study 244 Public Health Centers in Seoul and all of the countries were surveyed from October 15 1999 to June 30 2000. The study was done by telephone, e-mail, fax and questionnaire. First, the 25 Public Health Centers in Seoul were investigated, and then 107 Public Health Centers in other cities were investigated. Public Health Centers in Seoul and Public Health Centers in other cities are very different in exercise program and equipment, budgets, personnel. There were many kinds of exercise program for people who have health problems, but a few exercise programs for healthy people. Exercise programs for people who have health problems were to prevent hypertension, arthritis. obesity, diabetes and back pain. Physical activity and exercise programs for healthy people were stretching for pregnancy and elderly. There were $24(96.0\%)$ Public Health Centers in Seoul which had physical activity and exercise program, $80(36.5\%)$ Public Health Centers in other cities which had physical activity and exercise program.

• Journal of the Korean Society of Propulsion Engineers
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• v.6 no.2
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• pp.53-63
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• 2002

The steady-state and transient performance simulation program for a turboprop engine(PT6A-62) was developed. Specially this program included some algorithms, such as flat-rated behaviors in performance and limit control algorithms to prevent the compressor surge and the compressor-turbine inlet limit temperature overshoot. In order to minimize analysis errors, on interpolation method in component characteristics using matching errors and specific heat and specific heat ratio, which are functions of temperatures were used. The developed steady state performance analysis program can handle various conditions such as altitude, bleed extraction, inlet temperature and pressure and part throttle, and the transient performance analysis program incorporated a general mode for transient simulation and a control mode for prevention of the compressor surge and the turbine inlet limit temperature overshoot.

• Smart Media Journal
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• v.8 no.4
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• pp.72-79
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• 2019

The automated demand response (DR) program encourages consumers to participate in grid operation by reducing power consumption or deferring electricity usage at peak time automatically. However, successful deployment of the automated DR program sphere needs careful assessment of appliances load profile (ALP). To this end, the recent method estimates frequency, consistency, and peak time consumption parameters of the daily ALP to compute their potential score to be involved in the DR event. Nonetheless, as the daily ALP is subject to varying with respect to the DR time ALP, the existing method could lead to an inappropriate estimation; in such a case, inappropriate appliances would be selected at the automated DR operation that effected a consumer comfort level. To address this challenge, we propose a more proper method, in which all the three parameters are calculated using ALP that overlaps with DR time, not the total daily profile. Furthermore, evaluation of our method using two public residential electricity consumption data sets, i.e., REDD and REFIT, shows that our energy management systems (EMS) could properly match a DR target. A more optimal selection of appliances for the DR event achieves a power consumption decreasing target with minimum comfort level reduction. We believe that our approach could prevent the loss of both utility and consumers. It helps the successful automated DR deployment by maintaining the consumers' willingness to participate in the program.

• International Journal of Advanced Culture Technology
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• v.6 no.4
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• pp.205-213
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• 2018

This research is about effects of obesity adults participating in 12weeks of boxing diets program on weight loss, blood pressure and blood sugar improvements. The exercise program was conducted three times a week with a maximum heart rate of 50 to 65 percent for first to forth weeks and 65 to 85 percent for fifth to twelfth. The study included 59 obese people in their 20s and 50s, with a BMI of 25kg/m2 or higher, blood pressure of 140/90mmHg, and high blood pressure and diabetes patients of 125 mg/dl per fasting blood sugar. The following results were obtained by observing the results before and after the boxing exercise program. High blood pressure, diabetes, high blood pressure + diabetes after 12 weeks showed significant weight, BMI and body fat reduction, as well as significant decrease in blood pressure and fasting blood sugar. Consequently, through this study, obese adults can lower their weight, blood pressure, and blasting fasting blood sugar through a 12-week high-strength boxing exercise program and it is believed to help improve and prevent obesity, cardiovascular disease and metabolic diseases.

• Journal of Korean Academy of Rural Health Nursing
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• v.14 no.1
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• pp.8-16
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• 2019

Purpose: The purpose of this study was to examine the effect of a multifactorial program for urinary incontinence, self-esteem and self-efficacy in older women. Methods: A one-group pretest-posttest with no control group was used. Nineteen women completed weekly 90-min group sessions for eight weeks. The group received a multi-factorial program comprised of Kegel exercise, education and psychosocial programs over 8 weeks. Data on urinary incontinence, self-esteem and self-efficacy were collected twice: before the intervention and 8 weeks after the intervention. Data were analyzed using paired t-test by non-parametric statistics. Results: Total scores for the International Consultation on Incontinence Questionnaire decreased significantly after the intervention (pretest $7.95{\pm}5.48$, posttest $5.15{\pm}4.72$, p<.05). The scores for self-esteem and self-efficacy improved significantly. Conclusion: These results indicate that a multifactorial program for older women is feasible to prevent urinary incontinence in women living in the community.

• Journal of Korean Academy of Rural Health Nursing
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• v.16 no.1
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• pp.18-28
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• 2021

Purpose: This study attempted to confirm whether the suicide prevention effect could be achieved by managing the frailty of the elderly in rural areas. Methods: This study is a single-group pre-post study design. The frailty management program was applied twice a week for 12 weeks for the vulnerable elderly in the rural area from 16th April to 31st May in 2020. The program consisted of physical exercise, health education on nutrition management and disease control, cognitive training, and protein drink provision. Results: The average age of the participants was 77.1 years, and they lived alone (88.6%). As a result of providing the program, there were positive results such as increase in body strength (pre 12.27: post 13.27) and weight (pre 58.51: post 59.13), and decrease in depression (pre 4.66: post 1.20), and there was no statistically significant change in quality of life, Time Up & Go, and BMI. Conclusion: Frailty should be managed to prevent suicide in the elderly. It is necessary to expand and apply various programs that combine physical functions and emotional interventions such as health education, and exercise to maintain muscle strength.

• Journal of The Korean Society of Integrative Medicine
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• v.8 no.4
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• pp.49-58
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• 2020

Purpose : This study examined the effect of a home visit cognitive training program that uses a tablet-based digital recognition rehabilitation application, Brain Doctor, on local elderly people's cognitive function and depression. Methods : This study featured 20 elderly people living in Busan Metropolitan City, South Korea, who received a voucher for a home visit service to prevent dementia. The subjects were evenly divided into an intervention group provided with Brain Doctor and a control group provided with a conventional cognitive training program. Korean version of Mini Mental State Examination (MMSE-K) and Korean version of Montreal Cognitive Assessment (K-MoCA) were used to assess cognitive function in each group. Patient Health Questionnaire-9 (PHQ-9) was used to evaluate the depression levels. Results : The intervention group showed a significant change in cognitive function and depression after the intervention (p<.05). There was a statistically significant change in cognitive function and depression between the intervention and control groups (p<.05). Conclusion : This study confirmed that Brain Doctor had a positive effect on the cognitive function and depression of elderly people in the local community. It is expected to become a useful home visit program for dementia prevention in the future.

• Journal of Korean society of Dental Hygiene
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• v.12 no.5
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• pp.999-1006
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• 2012

Objectives : The purpose of this study was to understand and compare the knowledge of the adolescents and adults among the residents of Seoul metropolitan city about water fluoridation program. Methods : A total of 613 adolescents and adults between the age of 15 and 31-49 was surveyed by the questionnaire. Among them, the source of drinking water, the source of cooking water, awareness of caries prevention effect of water fluoridation program, awareness of cost benefit of health insurance of water fluoridation program, approval of water fluoridation program, awareness of health safety of water fluoridation program were surveyed. Results : 85.5% of adolescents and 88.9% of adults were surveyed to use public water supply for drinking water, and 95.3% of adolescents and 96.8% of adults were surveyed to use public water supply for cooking water. But only 14.0% of adolescents, comparing to the 42.1% of adults, were surveyed to be aware of the caries prevention effect of water fluoridation, and only 6.0% of adolescents, comparing to the 24.6% of adults, were surveyed to be aware of the caries prevention effect of water fluoridation to reduce to health insurance expenditure. About 82.6% of adolescents, comparing to the 92.1% of adults, were surveyed to vote for the fluoridation program, and only 6.8% of adolescents, comparing to the 28.6% of adults, were surveyed to be aware of health safety of water fluoridation program. Conclusions : Extensive oral health education program to the adolescents are necessary about using water fluoridation to prevent the dental caries.