• Food Science and Biotechnology
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• 제17권1호
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• pp.26-30
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• 2008

This study was conducted to identify the effect of chilling temperature (-3 and $6^{\circ}C$) and aging (1- and 7-day) on objective meat quality, collagen solubility, and free amino acids in pork (longissimus muscle of Yorkshire). Warner-Bratzler (WB)-shear force indicated that variation in chilling temperature had no detectable effect on meat tenderness and tenderization during the 7-day aging period. Among the 13 detected free amino acids, only 3 amino acids (histidine, valine, leucine) were significantly affected by the temperature treatment (p<0.05). Collagen solubility was significantly increased at $6^{\circ}C$ treatment (p<0.05). There was a significant linear relationship (r=0.67, p<0.05) between changes in free amino acids and WB-shear force during the 7-day aging period. These results confirmed that chilling conditions had significantly affected collagen solubility, and meat tenderization occurred in direct proportion to an increase in free amino acids.

• 지역연구
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• 제34권3호
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• pp.43-54
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• 2018

본 논문에서는 고령화의 진행이 초래하는 산업집적 패턴의 변화에 대해 신경제지리학적 접근을 통하여 분석하였다. 은퇴인구 변수의 추가는 단기적으로 지역별 물가, 소득, 명목임금 및 실질임금에 영향을 미친다. 일반적으로 장기균형 조건으로 채택되는 지역 간 실질임금의 균등화는 은퇴인구를 고려하지 못하므로 간접효용의 균등 조건을 추가하였으며, 새로운 장기균형을 달성케 하는 최적 세액을 제시한다. 은퇴인구의 발생은 모든 지역의 실질임금을 하락시킴과 동시에 효용기준을 만족시키는 특정 지역 제조업 종사자 비율의 지점을 하락시켜 제조업의 집적을 방해하는 반면, 세금은 은퇴인구가 발생한 지역의 효용과 실질임금을 높이고 다른 지역의 효용과 실질임금을 낮춘다. 이러한 상황에서 지역 간 실질임금 및 간접효용 비율이 같아지는 제조업 인구의 비율과 세금의 조합이 존재한다. 정부가 정액세의 부과를 통해 실질임금을 적절히 조정한다면 모든 지역에서 실질임금의 급격한 하락을 막으면서 효용수준을 안정시킬 수 있다.

• 농촌계획
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• 제21권4호
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• pp.85-94
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• 2015

The purpose of this study is to investigate how the hollowization in rural villages which causes marginal villages appears in Korean rural villages and whether the hollowization has relation with decrease and aging of population or not. For achieving the research objective, survey was carried out focused on Geumsan-gun. As a result, it confirmed that rural out-migration and rural decline especially in 'people', 'land(economic situation)' and 'community' have being progressed. Also variance analysis and regression analysis were executed with using the number of population and the ratio of people over 65 as dependent variables and using each survey contents(variables) as independent variables. The results of analysis showed that the ratio of people over 65(+), the income level per household(-), the rate of fallow lands(+), the number of empty houses(+), programs for urban-rural interchange(+), and the implementing public projects(+), etc. have a relation with the number of population(-) and the number of population(-), the income level per household(-), the rate of fallow lands(+), the number of empty houses(+), activities of communities(+), and the implementing public projects(+), etc. have a relation with the ratio of people over 65(+) (+: increase, -: decrease). So the hollowization in people', 'land(economic situation)' and 'community' has direct relation with decrease and aging of population in rural areas.

• 보건교육건강증진학회지
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• 제27권4호
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• pp.73-81
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• 2010

Objectives: The purpose of this study was to evaluate the effects of 12 weeks walking exercise program participation on changes in aging-related hormones concentration in elderly men. Methods: 16 elderly men(above 65 years old) were participated in 12 weeks walking exercise program by group types(exercise group ; n=8 & control group ; n=8), and their aging-related hormones(GH, testosterone and melatonin) levels were assessed before program(0 week) and after program(12 weeks). Regularly walking exercise program(field walking exercise) performed for 12 weeks(3days/week, 60~70min/day, HRR 55~65%). All data were expressed as mean and standard deviation by using SPSS/$PC^+$(ver. 13.0) program, and to evaluate the differences before and after treatment by groups, data were analyzed by paired t-test(a${\leq}$.05) and 2-way ANOVA was performed to examine the differences between groups and within groups by variables. Results and Conclusion: The conclusions obtained from this study were as follows ; In growth hormone. testosterone and melatonin response after 12 weeks exercise was increased significantly in walking exercise group(p<.01; p<.001; p<.001). And in result of 2-way ANOVA analysis for group, exercise, group${\times}$exercise, as compared with the exercise, there is significant difference in all items. Interaction effect of between group and exercise is difference significantly on GH(F=5.915, p<.05), testosterone(F=15.117, p<.01) and melatonin(F=8.131. p<.01) in all groups. We observed a direct relationship(positive improvement) between the regular physical activity and aging-related hormones(growth hormone, testosterone and melatonin concentrations) in elderly men.

• 치위생과학회지
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• 제23권2호
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• pp.169-175
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• 2023

Background: Although microbial infection is direct cause of periodontal disease, various environmental factors influence the disease severity. Aging is considered a risk factor for oral diseases, with the prevalence of periodontal diseases increasing with age. Moreover, senescence-associated secretory phenotype (SASP) expressed in age-related diseases is a key marker of chronic inflammation and aging phenotypes. Therefore, this study aimed to understand the relevance of senescent cells to periodontal health and disease, investigate the possibility of regulating the expression of aging- and osteolysis-related factors in gingival fibroblasts, and investigate the effect of senescence induction in gingival fibroblasts on osteoclast differentiation in mouse bone marrow-derived macrophages (BMMs). Methods: After stimulation with 400 nM hydrogen peroxidase, human gingival fibroblasts (HGFs) were examined for senescence-associated β-galactosidase. Western blot and enzyme-linked immunosorbent assays were performed to assess the expression of SASP. Osteoclast formation was assessed in BMMs using a conditioned medium (CM) from hydrogen peroxide-stimulated HGFs. Osteoclastic differentiation was investigated using tartrate-resistant acid phosphatase (TRAP) staining and activity. Data analysis was performed using SPSS version 25.0. Results: The expression of senescence-related molecules, including p53, p16, and p21, and the expression of osteolytic factors, including IL-6, IL-8, and IL-17, were found to be significantly higher in the hydrogen peroxide-stimulated HGF than in the control group. Regarding the indirect effects of senescent gingival cells, the number of osteoclasts and TRAP activity increased according to the differentiation of BMM cultured in CM. Conclusion: Our results on the of between osteolytic factors and cellular senescence in gingival fibroblast cells helped to reveal evidence of pathological aging mechanisms. Furthermore, our results suggest that the development of novel therapies that target specific SASP factors could be an effective treatment strategy for periodontal disease.

• 한국건축시공학회지
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• 제8권2호
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• pp.53-61
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• 2008

It is expected that the market of residential facility for retired seniors will be a new investment field for construction firms. This study describes the questionnaire survey analysis results of potential customers' demand for the facility. For comparison purpose, direct construction cost was estimated by estimation experts. In addition, a case analysis was conducted to compare direct cost and indirect project cost with the experts' estimation. According to the questionnaire survey analysis, it is observed that there were significant differences in demand between groups which are classified by the regions, living expenditures, the level of property ownership and the scales of residence. From an investor's perspective, investment decision on residential facility for retired seniors should be made considering bothe the level of returns which can be generated from the investment and the customers' needs.

• Journal of Dairy Science and Biotechnology
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• 제33권4호
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• pp.277-280
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• 2015

Acid- and acid/heat-coagulated cheese are cheeses made from direct acid- or acid/heat coagulation, consumed fresh without aging and have a soft texture. Despite of its short shelf-life, acid- and acid/heat-coagulated cheese are widely produced in all over the world due to their relatively easy manufacturing step and their popularity among consumers. Nowadays, acid- and acid/heat-coagulated cheese are used a lot as an ingredient of various foods as well. Therefore, understanding the characteristics of acid- and acid/heat-coagulated cheese is necessary to have more challenged application in food industries.

• 한국생활과학회지
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• 제18권5호
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• pp.995-1008
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• 2009

This study investigated the causal relationships among the elderly, looking at social participation, depression, self-reported health, and life satisfaction. It was especially focused on the mediating effects of depression and self-reported health on the relationship between social participation and life satisfaction. From the 2006 Korean Longitudinal Study of Aging, data for 4,155 elderly over age 65 was analyzed with structural equations modeling with Amos 7.0 and sobel test. Major findings were as follows. First, social participation of the elderly has a negative influence on depression and a positive influence on self-reported health and life satisfaction. Second, self-reported health has a partial mediating effect on the relationship between social participation and life satisfaction. Third, the direct effect of depression on life satisfaction was not statistically significant, while the direct effect of social participation was significant. Therefore, depression was not proved as a significant mediator. This study tested the effects of social participation on depression, self-reported health, and life satisfaction empirically and confirmed the partial mediating model, in which social participation improves the elderly's self-reported health, which in turn improves the elderly's life satisfaction. These results suggest the importance of an integrated approach for the healthy and successful aging and the diverse types of social participation in an elderly person's quality of life.

• 한국콘텐츠학회논문지
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• 제21권3호
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• pp.80-87
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• 2021

고령화가 전 세계적으로 급속히 진행되고 있다. 본 연구는 증가하는 노인을 대상으로 하는 디자인을 위해 인간 중심 디자인 철학을 바탕으로 노인의 필요와 욕망을 구체적으로 파악하기 위한 정성적 사용자 조사 방법을 모색하고 제안한다. 특히 실제 디자인 현장에서 노인이 사용하는 제품을 디자인 할 때 편리하고 손쉽게 사용할 수 있는 사용자 조사 방법을 제안하는 것을 목적으로 한다. 이를 위해 본 연구는 지팡이 디자인을 실제로 진행하면서 쉐도잉, 인터뷰, 직접 체험을 활용하여 그 사용과 함의를 살펴보았다. 쉐도잉은 AEIOU 프레임을 통해 정리하였으며, 인터뷰는 최근의 실버 세대의 경향을 반영하기 위해 의미성 항목을 특별히 추가하여 진행하였다. 직접 체험은 실내외 각각 4개의 사용자 행위 시나리오를 설정하여 디자이너들이 직접 체험해봄으로써 디자인 시사점을 도출하였다. 이 연구는 노인을 위한 디자인 수요가 다변화되고 증가하는 상황에서 중요하게 사용할 수 있는 사용자 조사 지침이 될 수 있을 것으로 기대한다.

• Safety and Health at Work
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• 제15권1호
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• pp.42-52
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• 2024

Background: The lack of headforms that accurately reflect the head characteristics of Koreans and the demographic composition of the Korean population can lead to inadequate FFR testing and reduced effectiveness of FFRs. Method: Direct measurements of 5,110 individuals and 3D measurements of 2,044 individuals, aged between 9 and 69 years, were sampled from the data pool of Size Korea surveys based on the age and gender ratios of the Korean resident demographics. Seven head dimensions were selected based on the ISO 16976-2, availability of Size Korea measurements, and their relevance to the fit performance of FFRs. A principal component analysis (PCA) was performed using the direct measurements to extract the main factors explaining the head characteristics and then the main factors were standardized and remapped to 3D measurements, creating five size categories representing Korean head shapes. Lastly, representative 3D headforms were constructed by averaging five head shapes for each size category. Results: The study identified two main factors explaining Korean head characteristics by the PCA procedure specified in ISO 16976-2 and developed five representative headforms reflecting the anthropometric features of Korean heads: medium, small, large, short & wide, and long & narrow. Conclusion: This study developed representative headforms tailored to the Korean population for conducting total inward leakage (TIL) tests on filtering facepiece respirators (FFRs). The representative headforms can be used for TIL testing by employing robotic headforms to enhance the performance of FFRs for the Korean target population.