• Journal of the Korea Academia-Industrial cooperation Society
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• v.17 no.10
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• pp.509-519
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• 2016

This study intends to examine how the subjective health perception of drinkers influences the depression trajectory change by using longitudinal data for elderly drinkers. This study has set up a balanced panel by combining the results from "Aging study panel research" conducted in the year 2006 (1st), 2008 (2nd), 2010 (3rd), 2012 (4th). A total of 543 elderly drinkers, who have responded to each research have been selected as targets for the final analysis. In the analyses, descriptive statistics and Latent Growth Modeling were conducted to examine the causal relationship between the observed and latent variables. The results are as follows: First, it was found that there was a negative correlation-with statistical significance-between the initial value of subjective health perception and the initial status of depression symptom. Second, there was a positive correlation between the initial value of subjective health perception and the changes of depression symptom. This indicates that elderly drinkers with high health perception usually have high degree of depression change; however, this does not mean it was statistically significant. Third, there was a statistically significant correlation between subjective health perception change and depression symptom change. It was found that the depression change level would be low if the subjective health perception change level was high. Thus, we can assume that the depression symptoms of elderly drinker c would slow down if the subjective health perception level increases.

• Journal of the Korea Academia-Industrial cooperation Society
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• v.19 no.12
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• pp.717-724
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• 2018

To prepare for the explosive increase in maintenance costs of bridges according to the aging of infrastructure, future maintenance costs of bridges should be predicted. For this purpose, the management status of bridges was investigated and modeled as the upper limit of the performance level and the target management level according to the life cycle. This paper proposes methodologies and procedures for estimating the bridge maintenance costs using two models and existing cost and performance prediction models that consist of unit repair cost model according to the safety score, performance degradation model of bridges, unit reconstruction cost, and average reconstruction time. To verify the applicability, future maintenance costs can be forecasted for specific management agency considering the number of bridges, degree of aging, and current management status. As a result, it is possible to obtain the maintenance cost and safety level of an individual bridge level for each year. In addition, by summing them up to the agency level, the average safety score, ratio of the safety level, inspection costs, repair costs, and reconstruction costs can be obtained. In a further study, the changes in maintenance costs can be analyzed according to the changes in the target management levels using the developed method. The optimal management level can be suggested by reviewing the results.

• Journal of the Korean Society of Food Science and Nutrition
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• v.42 no.2
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• pp.195-202
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• 2013

This study was carried out to identify the relationship of biochemical bone turnover markers, bone mineral density (BMD), and general characteristics in Korean women. One hundred eighty healthy women, 20 to 50 years of age, living in Gwangju and Chonnam participated. Serum bone-specific alkaline phosphatase (BAP) and osteocalcin (OC) were used as bone formation markers and N-telopeptide of type 1 collagen (NTx) was used as a bone resorption maker to evaluate the state of bone turnover. T-scores were measured to evaluate BMD. We analyzed general characteristics, including age, menopause status, osteoporosis history, alcohol consumption, physical activity level, and degree of obesity (BMI, percent of fat). The BAP level significantly decreased in the group of twenty-year olds and increased in the non-alcohol consuming group, the group with a family history of osteoporosis, the menopause group, and the obese group (p<0.05). The OC level was lower in the group of twenty-year olds and increased in the non-alcohol intake group and the menopause group (p<0.05). BMD significantly decreased in the obese group (p<0.05). In conclusion, BAP and OC were affected by age, alcohol consumption, osteoporosis history, menopause status, and obesity. BMD was affected by obesity degree. These results suggest that the management of alcohol consumption and obesity are important for maintaining bone status during aging in Korean women.

• Journal of Life Science
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• v.27 no.4
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• pp.471-475
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• 2017

Freezing pretreatment can destroy the cell membrane of garlic and may improve some food-quality of garlic. Therefore we investigated the effect of freezing pretreatment at $-20^{\circ}C$ and $-70^{\circ}C$ on quality of aged black garlic, compared with traditional processing methods. Our results showed that freezing pretreatment at $-70^{\circ}C$ had the greatest impact on qualities and antioxidant activities of black garlic. Browning degree and pH of black garlic after both the freezing pretreatment and aging process were 3.14 and 3.55, respectively. Furthermore, 2,2-diphenyl-1-picrylhydrazyl (DPPH) free radical scavenging activity and reducing power of aged black garlic can be enhanced by pre-freezing processing. Reducing sugar and 5-hydroxymethyl-2-furaldehyde (5-HMF) contents of freezing pretreated and aged black garlic were increased by 1.69 and 1.14 fold, respectively, compared with the control samples. The results indicated that freezing pretreatment had improved the overall qualities (such as browning degree, pH, reducing sugar) and functional materials of black garlic.

• Korean Journal of Food Science and Technology
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• v.28 no.3
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• pp.552-557
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• 1996

Gels of rice starches isolated from jinmibyeo, llpoombyeo and Dongjinbyeo were prepared with $60{\sim}65%$ water content (based on the total weight) and stored at $-18^{\circ}C,\;4^{\circ}C,\;20^{\circ}C,\;30^{\circ}C,\;and\;37^{\circ}C$ for 6 days. The effects of varieties, water content and storage temperature on the degree of retrogradation (DR) of gels were measured by ${\alpha}$-amylase-iodine method. DRs of rice starch gels increased rapidly during the initial stage of storage, but slowly after that. DRs were highest with 60% water content and lowest with 65% water content at any storage temperature. Regarding the storage temperature, DRs of gels increased in the following order : $4^{\circ}C>20^{\circ}C>30^{\circ}C>37^{\circ}C>-18^{\circ}C>$. As the storage temperature was increased, DR per $10^{\circ}C$ increased above refrigerated temperature decreased in the following order : jinmibyeo>llpoombyeo>Dongjinbyeo.

• Journal of Oral Medicine and Pain
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• v.26 no.2
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• pp.107-114
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• 2001

Oral malodor is a problem that traverses history, culture, race and sex. But, up to the present the study on prevalence of oral malodor in normal popualtion is short, especially there is no study on oral malodor prevalence in Korean. In our study, we investigated self-evaluation of oral malodor, self-rating intensity of oral malodor, patients efforts for curing their oral malodor, and degree of satisfaction with their efforts. Investigation was carried out on 368 public Koreans resident in a big city(174 males, 194 females), by method of self-reporting to prepared questionnaire. There was no difference in self-reporting prevalence of oral malodor in sexes(57.5% in male, 58.8% in female), and the prevalence rate was increased with aging. Self-rating intensity of oral malodor in oral malodor patients group(by self-reporting) was ranked in order of slight, weak, middle, strong in both sexes, but the number of self-rating strong female group is significantly larger than that of self-rating strong male group(9.3% in male, 17.9% in female). In question on duration of oral malodor, most subjects answered that their oral malodor was developed in certain circumstances(61.3% in male, 76.3% in female), and oral malodor-developing circumstances was ranked in order of in the early morning, in hunger state, in fatigue, in stressful situations. Subjects effort for curing their oral malodor was ranked in order of more tooth brushing, gum chewing, use of commercial product for oral hygiene, visit dental clinic, and rates of no effort subjects were 15.3% in males and 10.7% in females. The degree of satisfaction with their efforts for curing their oral malodor was very low, only 5.6% of males and 6.6% of females were answered that there were satisfactory improvement in their oral malodor. Collectively, our result revealed that prevalence of oral malodor in public Koreans and their interest in oral malodor were much higher than our anticipation, and that patients satisfaction with improvement in oral malodor was short of their expectations. Considering the life quality of patients suffering from oral malodor, we conclude that developments of more improved diagnostic tools and treatment methods for oral malodor is indispensable in future.

• Journal of the Korea Academia-Industrial cooperation Society
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• v.13 no.8
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• pp.3544-3551
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• 2012

As Korean society is quickly aging and experiencing longer life-spans, there has been increasing interest in the quality of life of the elderly. Depression has been indicated as an significant factor in the later years of one's life. The purpose of this study is to seek ways to improve the quality of life of the elderly in senior welfare center as it examines the quality of life and the extent of depression in them. One-on-one interviews were conducted with 127 subjects from the senior welfare center from November, 2011 to January, 2012, using Korean versions of WHOQOL-BREF and the Beck Depression Inventory. Among the interviewees were 62 males and 65 females. The study showed that the quality of life measured 85.82(${\pm}16.35$) points out of 130 and the extent of depression measured 9.45(${\pm}8.02$) points. The quality of life showed significant differencies according to education, degree of health, type of health insurance, occupation, and financial independence; while the depression varied according to gender, education, degree of health, type of health insurance, occupation, means of daily living, financial independence and leisure activities. Significant correlation was shown statistically between quality of life and depression. It is recommended that local communities develop programs for the promotion of the aged health and active social participation as well as job creation for the elderly, in order to improve the quality of life.

• Journal of Mechanical Science and Technology
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• v.16 no.7
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• pp.919-926
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• 2002

In this study, the numerical prediction of the thermal fatigue lie? of a $\mu$BGA (Micro Ball Grid Array) solder joint was focused. Numerical method was performed using the three-dimensional finite element analysis for various solder alloys such as Sn-37%Pb, Sn-3.5%Ag, Sn-3.5%Ag-0.7%Cu and Sn-3.5%Ag-3%In-0.5%Bi during a given thermal cycling. Strain values obtained by the result of mechanical fatigue tests for solder alloys, were used to predict the solder joint fatigue life using the Coffin-Manson equation. The numerical results showed that Sn-3.5%Ag with the 50-degree ball shape geometry had the longest thermal fatigue life in low cycle fatigue. A practical correlation for the prediction of the thermal fatigue life was also suggested by using the dimensionless variable γ. Additionally Sn-3.5Ag-0.75Cu and Sn-2.0Ag-0.5Cu-2.0Bi were applied to 6$\times$8$\mu$BGA obtained from the 63Sn-37Pb Solder. This 6$\times$8$\mu$BGA were tested at different aging conditions at 130$\^{C}$, 150$\^{C}$, 170$\^{C}$ for 300, 600 and 900 hours. Thickness of the intermetallic compound layer was measured thor each condition and the activation energy thor their growth was computed. The fracture surfaces were analyzed using SEM (Scanning Electron Microscope) with EDS ( Energy Dispersive Spectroscopy).

• Journal of the Korea Institute of Building Construction
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• v.3 no.1
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• pp.107-114
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• 2003

This study aims to find methods that prevents aging of buildings paint coating and that limits defects in construction. Defects in painting can occur in four stages: pure paint, during painting, after the paint coating has dried, and after some period of time has passed after coating. Paint may become bad due to precipitation of pigments, formation of membranes, and seeding during manufacturing. Therefore, it is important that the paint is well mixed and kept airtight at a cool, dark place. Indents, paint brush strokes, orange peel, separation of colors, and paint running and spreading during the paint work process can be prevented by using high quality materials and applying a high-level of construction method. After the paint coating has dried, boiling, yellowing, poor drying, poor bonding, and/or glen deficiency may occur. These are influenced by the levels of cleanness of the dried product, drying temperature and hydration. Then, when the coating has been left dried for some period of time, cracking, peeling, scaling, swelling, discoloring, and/or rusting may develop due to the ultraviolet and contaminants in the air. Since these defects occur due to inappropriate construction schedule and/or hot and humid condition, one must use weatherproof materials. Furthermore, poor paint color may be caused by contamination in the sample plate, discoloration, and/or discrepancies in colors which are due to material differences, level of glossiness, degree of dispersion, dual color property of metallic colors, precipitation of pigments, etc. One should achieve reduction in construction cost and effectiveness in paint work by limiting contaminations in the construction site and strictly observing to construction regulations.

• Journal of agricultural medicine and community health
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• v.20 no.2
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• pp.121-131
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• 1995

This study aims 1) To explicate the multidimensional structure of a widely used measure of subjective well-being, the Philadelphia Geriatric Center(PGC) Morale Scale is used to measure health in elderly populations and 2) To examine the relationship between the socioeconomic status and related variables, health and physical disability and subjective well-being in elderly populations. The selection of subjects was determined through a survey of 672 rural dwelling elderly persons(269 males and 403 females) aged 60 years and over. The respondents were interviewed by 18 trained health workers using the questionnaire from July 4 to July 9 in 1994. The subjects were surveyed again during the period from August 1 to August 6 in 1994 to conform the questionnaire's reliability. Subjective well-being was evaluated using the Revised Questionnaire of the Philadelphia Geriatric Center(PGC) Moral Scale(17 items, Lawton, 1975). The results are as follows : 1) The item scores were intercorrelated and subjected to a principal component analysis. A rotated three-factor solution was done, accounting for 40.9% of the total variance. Thus, the PGC morale Scale can be derived from three stable factors : Factor 1 was explained "Lonely Dissatisfaction(7 items)", Factor 2 was explained "Agitation (5 items)", Factor 3 was explained "Attitude Towards Own Aging (5 items)". Further, these factors have a high degree of internal consistency, as determined by Cronbach's alpha : 0.7852. 2) The total mean score of PGC Morale Scale was 8.73. Sex, Age, Education, Current disease, Family type, Economic status, ADL, IADL were significantly difference in mean scores of PGC morale scale. 3) In the results of stepwise multiple regression analysis of subjective well-being. the most contributing factors were economic status, IADL, current disease, family type, sex and the R square was 0.23.