• Journal of Biomedical Engineering Research
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• v.35 no.5
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• pp.169-176
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• 2014

As body postures on bed affects various sleep related diseases, it is considered as important information when monitoring sleeping in daily life. Though there have already been a few approaches to monitor body postures on bed conventionally, the development for simple and unconstrained methods is still needed to realize the long-term daily monitoring. Focusing on the fact that ballistocardiogram changes depending on the body postures on bed, we developed a novel method to estimate body posturesusing extremely simple, film-type ballistocardiogram sensor which is based on polyvinylidene fluoride(PVDF) film. With 10 subjects, we performed two experiments. One was for an estimation test to show that body postures on bed can be estimated by ballistocardiogram, and the other was for a reproducibility test to present the feasibility of ballistocardiogram based body postures monitoring. To estimate body postures on bed, we made an individual template set of body postures by designating one ballistocardiogram (BCG) sample as a template in each postures. Then, we calculated Pearson's correlation coefficients between a sample and each templates and estimated the body posture of the sample by choosing a posture which corresponds to the most significant correlation coefficients. As a result, we estimated body postures on bed with 99.2% accuracy in average and found that the estimation using ballistocardiogram is reproducible.

• Journal of the Korean Society of School Health
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• v.20 no.1
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• pp.1-9
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• 2007

Purpose: The purpose of this study was to examine the effect of school-based preventive education on smoking-related knowledge, attitude and practice of health behaviors among elementary school children at a rural province in Korea. Methods: The subjects were 134 among the 4th -6th graders (exp. = 67, control = 67) from two schools at J province. Education program was conducted in 5-sessions for experimental group. And study instrument for smoking-related knowledge was developed 2-point 15-items (a = .82), for attitude was 3-point 15-items (a = .79), and for practice of health behavior was also 3-point 30-items (a = .86). Data were collected by interview from May 28th to July 10th 2003 and analyzed with the frequency, percentage, x2-test and t-test using SPSS-PC program, Results: The group of having smoking experiences was 14.2% and 52.2% of the subject had smoking family members. The first motive of smoking was curiosity in 78.9% and 36.8% of them started smoking before the third grade. School-based preventive education of smoking were affirmatively effective in smoking-related knowledge (t = 4.14, p = .001), smoking-related attitude (t = 3.654, p = .001), practice of health behavior, on the other hand, was not changed significantly by the education. Conclusion: Based on these findings, the authors recommend that school-based smoking prevention education should be started from lower graders in regular curricular basis and health promotion program for primary school children should be emphasized to lead healthy behavior in collaboration with public and private health sectors in community.

• Steel and Composite Structures
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• v.46 no.3
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• pp.385-401
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• 2023

Steel is becoming increasingly popular due to its high strength, excellent ductility, great assembly performance, and recyclability. In reality, steel structures serving for a long time in atmospheric, industrial, and marine environments inevitably suffer from corrosion, which significantly decreases the durability and the service life with the exposure time. For the mechanical properties of corroded steel, experimental studies are mainly conducted. The existing numerical analyses only evaluate the mechanical properties based on corroded morphology at the isolated time-in-point, ignoring that this morphology varies continuously with corrosion time. To solve this problem, the relationships between pit depth expectation, standard deviation, and corrosion time are initially constructed based on a large amount of wet-dry cyclic accelerated test data. Successively, based on that, an in-situ pitting evolution method for evaluating the residual tensile strength of corroded steel is proposed. To verify the method, 20 repeated simulations of mass loss rates and mechanical properties are adopted against the test results. Then, numerical analyses are conducted on 135 models of corrosion pits with different aspect ratios and uneven corrosion degree on two corroded surfaces. Results show that the power function with exponents of 1.483 and 1.091 can well describe the increase in pit depth expectation and standard deviation with corrosion time, respectively. The effect of the commonly used pit aspect ratios of 0.10-0.25 on yield strength and ultimate strength is negligible. Besides, pit number ratio α equating to 0.6 is the critical value for the strength degradation. When α is less than 0.6, the pit number increases with α, accelerating the degradation of strength. Otherwise, the strength degradation is weakened. In addition, a power function model is adopted to characterize the degradation of yield strength and ultimate strength with corrosion time, which is revised by initial steel plate thickness.

• KSCE Journal of Civil and Environmental Engineering Research
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• v.26 no.1D
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• pp.73-79
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• 2006

A major purpose of this study is to develop high modulus asphalt mixtures for perpetual asphalt pavements which can save maintenance cost by increasing the design and performance periods of the pavements. Various physical and mechanical laboratory tests are performed for the high modulus asphalt binder developed in this study. The test results show that the properties of the high modulus binder are similar to those of the French high modulus binders. In addition to the binder tests, various performance tests are conducted for the high modulus and conventional mixtures. The dynamic modulus test results indicate that the dynamic modulus values of the high modulus mixtures are higher than those of the conventional mixtures by 10~15% at $5^{\circ}C$, 20~25% at $15^{\circ}C$ and 100% at $30^{\circ}C$. It is observed from the performance tests that the high modulus mixtures yield better fatigue, rutting and moisture damage performance than the conventional mixtures.

• Journal of the Korea Concrete Institute
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• v.24 no.6
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• pp.677-684
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• 2012

In recent years, extension of life span of buildings is becoming an important issue in our society. To improve the life span of buildings, rhamen structure construction and long-spanned structures are advantageous. And in order to achieve this goal, structural elements of buildings must be light and slender. As an alternative method, general porous slabs are used frequently domestically and internationally. But the study on the porous slabs using T-deck plate and assembly of light weight precast construction is insufficient at present. In this study, flexural and fatigue tests were performed on six specimens to verify structural performance and serviceability. The main parameters of the specimens were light weight and T-deck plate construction possibility as well as slab thickness. The test results indicated that the strength of porous slabs using T-deck plate and assembly of light weight were much better than general RC slabs and porous slabs without T-deck plate. And stiffness was much better than that of other tested slabs.

• Journal of Korean Public Health Nursing
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• v.11 no.2
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• pp.57-72
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• 1997

The objectives of this study are : 1) To understand self-care ability, living habits, utilization patterns of medical facililties for the elderly in Puk-Cheju county which has the highest percent age of senior citizens among Cheju rural community: 2) To identify factors which influence living quality and long life for the eldely 3) To develop health care service with a view to guaranteering living quality The eldely population of Puk-Cheju county was $10.8\%$ in 1995. It will be increasing and is projeted $23.0\%$ by 2030. The result indicated that utilizations rate by out-patient were 5.89 claims and utilizations rate by in-patient were 0.17 claims per person. The highest disease among respondents were disease of musculoskeletal system and connective tissue. A total of 310 elderlys were responded to analyze self-care ability and health behavior. The most important factors of long life were to have peaceful mind$(50.0\%)$. The common disease of acute and chronic disease was musculoskeletal system disease. $66.8\%$ of respondents went to hospital and local clinic when they got sick. The most needed health care service was home visiting service among public health center, representing $31.4\%$. The repondent's self-care ability and self-efficacy were relatively superiority. A total of 92 elderlys were conducted the intelligence test for the rate of dementia and their average age was 74.3. The result of Minimental State Scale indicated that 25% of respondents were suspected to be dementia. The followings are recommendations based on the survey result. 1) Concidering every conditions of self-care ability and health status for elderly. It is important to embody appopriate health care service. 2) Considering concrete method, it is necessary to establish health service, which match health status and self-care ability, and various planning for sepecial facilities for the elderly. 3) It is desiable to make actual programs for the elderly in each community level. 4) It must be develop the better use of volunteers and programs for prevention of dementia. Finally, Concerning the orgarnization of public health center, community health center need to be reorganized for health service for the elderly. It is important to develop and operate health promotion for the elderly, and it is necessary to form the foundation for the support of facilities equipments. This contribute to promote health status for the rural elderly.

• The Korean Journal of Mycology
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• v.14 no.2
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• pp.149-163
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• 1986

To determine contents of general constituents of Ganoderma lucidum in Korea, the dried carpophores were analyzed. The contents of water, ash, crude lipid, crude protein and crude cellulose were 14.6, 2.0, 3.3, 23.6, and 59.0%, respectively. Among reducing sugars, maltose was the most abundant. Seventeen free amino acids were detected, showing alanine the highest value. The pH of hot water extract was 4.1-4.2. The spores of Ganoderma lucidum was flat and ovoidal long. Their size was $6.3-7.1{\times}3.5-4.3{\times}2.0-2.5\;{\mu}m$ long. To examine effects of life span against sarcoma-180 cells, Fractions A, B and C, were obtained from the extract of Ganoderma lucidum. The survival rates of Fractions A, B and C were 131.7, 162.5, and 141.7 %, respectively. In addition, to examine effects of Fraction B on cell-mediated immunity, delayed type hypersensitivity (=DTH) test was conducted. It restored the suppressed DTH in the sarcoma-180 bearing group up to 66.7%.

• Journal of Life Science
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• v.19 no.10
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• pp.1389-1395
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• 2009

Generally, it takes a long time to purify wood vinegar, and it contains toxic compounds such as tar, methanol, phenol and benzopyrene. To reduce the toxicity of wood vinegar itself, we have developed a new purification method of wood vinegar using an oxidation-cohesion reaction and distillation with an active carbon. We have investigated the physico-chemical change (pH, specific gravity, refractive index and dissolved tar), the change of amount of toxic compounds (carbonyl group, phenol, benzopyrene and residual solvents) and organic acids (formic acid (FA), acetic acid (AA), propionic acid (PA)) of the purified wood vinegar under the long term and accelerated storage conditions. Also, we have evaluated the effect of the purified wood vinegar on hair growth using an alopecia model of C57BL/6 mice. As a result, we could find out that the purified wood vinegar was stable and remained without decay under the storage conditions and benzopyrene, a carcinogenic agent, was not detected in the purified wood vinegar. After topical treatment of the purified wood vinegar solution or minoxidil (MXD) for 2 weeks to dorsal skin, the hair regrowth of the mice accelerated faster than that of the control, with no clinical signs. In conclusion, we could suggest a guideline for quality control of process to reduce the toxic compounds in wood vinegar and it might be a useful hair growth promoter in the treatment of baldness or alopecia.

• Journal of the Korean Institute of Landscape Architecture
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• v.51 no.1
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• pp.56-71
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• 2023

Citizens' needs for urban green spaces are on the rise due to improved quality of life and increased interest in environments. The garden is noteworthy because it is small in size, making it less controversial to create in the city, and it is adjacent to the residential area, improving citizens' daily environment. Moreover, recently gardens is attracting attention as a tool for urban regeneration, such as being created in declining areas as part of a government project. Therefore, it is time to study the role and value of urban gardens in deteriorated areas in terms of space welfare. However, there are few studies that quantitatively evaluate the effects of gardens, and many prior studies are limited to focusing the green space larger than a certain size (e.g., parks and forests). Therefore, the aim of this study is to examine the effect of garden and gardening quantitatively, paying attention to social aspects such as life satisfaction and community of inhabitants. The study was conducted in an old row housing complex in Gojan1-dong, Ansan-si, Gyeonggi-do. In there, some of the dwellers voluntarily created outdoor gardens and engaged in gardening for a long time. In addition, after the 2017 Gyeonggi-do Garden Fair, several gardens have been maintained and used by residents there. For the first step, the field trip was done to research the status of the garden in the area, and then, a survey was conducted on whether or not gardening has an impact on the life satisfaction and community of residents. The results were analyzed by t-test and ANOVA. As a result, residents who are engaged in gardening are more active in the "neighborhood exchange" and "resident participation" than those who are not engaged in gardening. In addition, if residents voluntarily create a garden, the level of "satisfaction of life" is higher than those staying in the garden which is constructed by the government. And a resident who is gardening in the complex shows higher life satisfaction than those who garden outside of the complex. These results confirmed that the garden has positive effects promoting "exchanges with neighbors", "participation in the community", and "life satisfaction" of residents. It shows that it is important to ensure the right of residents to participate in the garden-making process as much as possible, and the garden's location should be paid attention to maximize the positive effect of gardens.

• Korean Journal of Health Education and Promotion
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• v.22 no.4
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• pp.73-90
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• 2005

Objectives: Smokers who had failed to quit smoking were frequently reported that life stress mostly interrupted their abstention. Stress vulnerability model for smoking cessation has been considered, and most of contemporary smoking cessation programs help smokers develop coping strategies for stressful situations. This study aims to investigate the appropriate coping styles for stress of abstention from smoking. The result of investigating the relationship between abstention following smoking cessation program and coping styles would suggest useful information for those who want to stop smoking and health practitioners who help them. Methods: Participants were 69 smokers (62 males, 7 females) participated in a hospitalized smoking cessation program, whose mean age was 44.89 (SD=9.61). Participants took medical test and completed questionnaires and psychological tests including: Fagerstrom Test for Nicotine Dependence and Multidimensional Coping Scale. To identify participants' abstention, researchers followed them for 2 years. To identify whether abstained or not and encourage them to abstain, researchers called them on the telephone once a week for 3 months. After 3 months, they were contacted every other week till 6 months passed since they left smoking cessation program. And they were contacted once a month for other 18months. Researchers also contacted their family to identify their abstention. Data Mining Decision Tree was performed with 37 variables (13 variables for the coping styles and 24 smoking-related variables) by Answer Tree 3.0v Results: Forty four (63.8%) out of sixty nine for 2 weeks, 34 (49.3%) for 6 months, 25 (36.2%) abstained for 1 year, and 22 (31.9%) abstained for 2 years. Participants of this study abstained average of 286.77 days from smoking. Included variables of a Decision Tree model for this study were positive interpretation, emotional expression, self-criticism, restraint and emotional social support seeking. Decision Tree model showed that those (n=9) who did not interpret positively (<=7.5) and criticized themselves (>6.5) abstained 23 days only, while those (n=9) who interpreted positively (>7.5), expressed their emotion freely (>6.5), and sought social support actively (>11.5) abstained 730 days, till last day of the investigation. Conclusion: The results of this study showed that certain coping styles such as positive interpretation, emotional expression, self-criticism, restraint and emotional social support seeking were important factors for long-term abstention from smoking. These findings reiterate the role of stress for abstention from smoking and suggest a model of coping styles for successful abstention from smoking. Despite of limitation of this study, it might help smokers who want to stop smoking and health practitioners who help them.