• 대한임상전기생리학회지
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• 제3권1호
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• pp.31-47
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• 2005

Fatigue is a common experience in our daily life and in therapeutic exercises. Human muscle fatigue has been studied using a wide variety of exercise models, protocols and assessment methods. This study conducts quantitative evaluation of fatigue of knee extensor with surface electromyography and dynamometer and is to provide basic materials in physical therapy diagnosis and assessment of skeletal muscle. Measurement of two stages was conducted with 88 normal adults between their twenties and seventies, correlations and differences using collected data according to age was compared and correlations among measured items were analyzed and then the following conclusions were obtained. Analysis of sEMG and dynamometry of knee extensor showed that MDF, FI, MVIC, ET had the closest relations with age and MDF, FI, MVIC were significantly increase with aging. In addition, it was found that there were high correlation among items of analysis.

• 한국압력기기공학회 논문집
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• 제12권2호
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• pp.50-57
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• 2016

The study presents structural integrity assessment of ductility degradation of a baffle former assembly by performing finite element analysis considering real loading conditions and stress triaxiality. Variations of fracture strain curves of type 304 austenitic stainless steel with stress triaxiality are derived based on the previous study results. Temperature distributions during normal operation such as heat-up, steady state, and cool-down are calculated via finite element temperature analysis considering gamma heating and heat convection with reactor coolant. Variations of stress and strain state during long operation period are also calculated by performing sequentially coupled temperature-stress analysis. Fracture strain is derived by using the fracture curve and the stress triaxility. Finally, variations of ductility degradation damage indicator with the fracture strain and the equivalent inelastic strain are investigated. It is found that maximum value of the ductility degradation damage index continuously increases and becomes 0.4877 at 40 EFPYs. Also, the maximum value occurs at top and middle inner parts of the baffle former assembly before and after 20 EFPYs, respectively.

• Nuclear Engineering and Technology
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• 제49권2호
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• pp.349-359
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• 2017

During the past 25 years, in the context of probabilistic safety assessment, efforts have been directed towards establishment of comprehensive pipe failure event databases as a foundation for exploratory research to better understand how to effectively organize a piping reliability analysis task. The focused pipe failure database development efforts have progressed well with the development of piping reliability analysis frameworks that utilize the full body of service experience data, fracture mechanics analysis insights, expert elicitation results that are rolled into an integrated and risk-informed approach to the estimation of piping reliability parameters with full recognition of the embedded uncertainties. The discussion in this paper builds on a major collection of operating experience data (more than 11,000 pipe failure records) and the associated lessons learned from data analysis and data applications spanning three decades. The piping reliability analysis lessons learned have been obtained from the derivation of pipe leak and rupture frequencies for corrosion resistant piping in a raw water environment, loss-of-coolant-accident frequencies given degradation mitigation, high-energy pipe break analysis, moderate-energy pipe break analysis, and numerous plant-specific applications of a statistical piping reliability model framework. Conclusions are presented regarding the feasibility of determining and incorporating aging effects into probabilistic safety assessment models.

• 한국압력기기공학회 논문집
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• 제17권1호
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• pp.28-35
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• 2021

The flow accelerated corrosion (FAC) is one of significant aging and degradation mechanism and can affect structural integrity of CANDU feeder pipes. Pipe burst can occur under normal operation pressure (min. 10 MPa) if wall-thinning of the feeder pipe due to FAC is accumulated. Previous studies considered simple shapes of feeder pipe with local wall-thinning in order to conservatively assess structural integrity of wall-thinned feeder pipe. In this paper, a new FE model is developed, having an actual shape of the feeder pipe (double bent) as well as the actual wall-thinning shape and location based on the in-service inspection result. Then, the burst pressure assessment of the wall-thinned feeder pipe is performed using lower bound limit load analysis considering elastic-perfectly plastic material. In addition, an improved formulation to predict the burst pressure of the wall-thinned feeder pipe is presented and the safety margin is compared with an existing assessment method.

• 수산경영론집
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• 제53권4호
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• pp.27-49
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• 2022

This study focused on diagnosing and analyzing the level of sustainable development for each fishing communities by applying the sustainable development index in the fishing communities to support the policy of revitalizing the fishing communities. In terms of methodology, diagnostic indicators for rural areas were used through previous studies and literature surveys, and three categories, five fields and 27 indicators were finally selected through collecting opinions from experts. After deriving the weight for each indicator in detail, the final sustainable development index of the fishing communities was applied to fishing village fraternity. Based on the results of the analysis of the application of sustainable development cases in fishing communities, policy support should be implemented differentially according to regional decline factors and potential growth factors. In the population and social sector, it is necessary to consider ways to reduce population and reduce aging. In the industrial and economic sectors, fishing activation and systematic support for fishing-related industries should be provided. In the marine and built environment sector, the government's active project execution and budget support are required. In addition, it is expected to be used in various ways in the process of developing fishing communities and establishing revitalization plans that reflect the characteristics of the region.

• 한국간호교육학회지
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• 제3권2호
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• pp.163-192
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• 1997

As the population over the age of 65 increases, the demand for nurses who care for this group also continues to grow. Well-prepared nurses who are knowledgeable and skilled for the elderly can be prepared through systematic gerontological nursing curricula. This study was carried out to identify the needs for gerontological nursing curricular contents. The subjects for this study were two participant groups the educators who teach gerontological nursing in three-year and four-year baccalaureate nursing programs, and the nurses who are working with the elderly in hospitals, community health centers, social welfare agencies, and community health practioner's posts. The major findings of the study are as follows : 1. The differences between actual contents and essential contents of the educators : Concerning the actual contents that is actually taught, the educators showed the highest scores on the demographics of older adults and the lowest scores on the cultural variations affecting health care. Regarding the essential contents, the educators showed the highest scores on the demographics and the lowest scores on the economics of aging. Aside from the demographics, all of the items were found to have significant differences between essential and actual contents. This implies that all the content areas except demographics should be emphasized. 2. The differences between actual knowledge and essential knowledge of the nurses : Concerning the nurses' actual knowledge, the nurses showed the highest scores on the common health problems and their treatment and the lowest scores on the politics of aging. Regarding the essential knowledge, nurses showed the highest scores on the chronic illness and common health problems and the lowest scores on their roles and functions. However, they thought all the items to be essential. All of the items were found to have significant differences between actual and essential knowledge. The nurses who studied gerontological nursing in their school years and after graduating had more knowledge. However, they felt more knowledge was needed. This implies that the nurses need more education in all content areas of gerontological nursing. 3. The differences between educators and nurses : Concerning the essential contents, the educators showed higher scores on the demographics and growth and development than the nurses. Whereas, the nurses showed higher scores on the cultural variations, long-term care, economics of aging, politics of aging, legal and ethical issues, and common health problems than the educators. 4. Activities of nursing care for the elderly : Most common activities were related to direct nursing care such as giving physical care, counseling/teaching clients, and assessing and planning care for the clients. Nurses thought that all the items were critical, but they showed relatively low scores on the following :'serve on multidisciplinary committee', 'preparing reports', 'evaluation of outcomes of care', 'determine policy for nursing service', 'set patient care standards', and 'participate in nursing research' The constraints in providing better nursing service were time constraints, administrative restraints, social restraints, and inadequate knowledge.

• 한국지하수토양환경학회지:지하수토양환경
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• 제16권4호
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• pp.38-52
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• 2011

Sorption and sequential desorption experiments were conducted for Zn using a natural soil (NS) in background status by aging (1, 30 and 100 days). The sorption isotherm showed that Zn had high sorption capacity but low sorption affinity in NS. Sequential desorption was biphasic with appreciable amount of sorbed Zn residing in the desorption-resistant fraction after several desorption steps. The biphasic desorption behavior of Zn was characterized by a biphasic desorption model that includes a linear term to represent labile or easily-desorbing fraction and a Langmuirian-type term to represent desorption-resistant fraction. The biphasic desorption model indicated that the size of the maximum capacity of desorption-resistant fraction ($q^{irr}_{max}$) increased with aging in NS. Desorption kinetics and desorption-resistance of Zn in the soils collected from mine tailings (MA, MB and MC collected from surface, subsurface soils and mine waste, respectively) were investigated and compared to the bioavailability to earthworm (Eisenia fetida). Desorption kinetic data of Zn were fitted to several desorption kinetic models. The ratio ($q_{e,d}/q_0$) of remaining Zn at desorption equilibrium ($q_{e,d}$) to initial sorbed concentration ($q_0$) was in the range of 0.53~0.90 in the mine tailings which was higher than that in NS, except MA. The sequential desorption from the mine tailings with 0.01M Na$NO_3$ and 0.01M $CaCl_2$ showed that appreciable amounts of Zn are resistant to desorption due to aging or sequestration. The SM&T (Standard Measurements and Testing Programme of European Union) analysis showed that the sum of oxidizable (Step III) and residual (Step IV) fractions of Zn was linearly related with its desorption-resistance ($q^{irr}_{max}$) determined by the sequential desorption with 0.01M Na$NO_3$ ($R^2$= 0.9998) and 0.01M $CaCl_2$ ($R^2$= 0.8580). The earthworm uptake of Zn and the desorbed amount of Zn ($q_{desorbed}$ = $q_0-q_{e,d}$) in MB soil were also linearly related ($R^2$ = 0.899). Our results implicate that the ecological risk assessment of heavy metals would be possible considering the relation between desorption behaviors and bioavailability to earthworm.

• 대한지역사회영양학회지
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• 제19권2호
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• pp.142-162
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• 2014

Objectives: To evaluate the critical environmental factors on healthy-aging of Korean people, we investigated the significant factors influencing health status of septuagenarians living in rural area of Jeonla province, known to be one of the representative longevity regions in Korea. Methods: We divided subjects into healthy group (36M/25F) or poor-health group (26M/73F) based on self-reported health status, body mass index, a number of prescription, and blood test data. General characteristics, physical measurements, lifestyle, dietary behavior and nutrient intake, physical health and mental health data were statistically compared between the two groups. Results: Average age was not different between healthy group and poor-health group in men and women, respectively. In men, significantly favorable factors to health were observed to be higher education, regular exercise, higher grip strength and walking function, body mass index (${\geq}18.5kg/m^2$), moderate frequency of drinking and eating-out, non-smoking, normal red blood cell (RBC) count, higher serum dehydroepiandrosterone-sulfate (DHEAS) level, good digestive function and appetite, normal hearing function, regular meals, adequate vegetable and fruit intake, diverse food intake, adequate energy and nutrients (protein, vitamin $B_1$, $B_6$, C and E, folate, niacin, P, Zn and K) intake, higher mini-nutrient status assessment (MNA) score and low level of depression. On the other hand, in women, those were literacy, living arrangement, moderate frequency of drinking, healthy teeth, higher grip strength and walking function, bone mineral density, normal RBC and white blood cell (WBC) count, higher DHEAS concentration, higher MNA score, normal cognition and memory function, having snack and adequate fruit intake. Conclusions: These results could be useful to plan effective strategies to increase health-life expectancy of Korean old people living in rural areas.

• 한국전산구조공학회논문집
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• 제26권2호
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• pp.131-138
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• 2013

면진장치는 상부구조물의 지진력을 감소시키는데 크게 기여하지만, 고감쇠고무 적층받침에 사용되는 고무재료는 시간이 경과함에 따라 열화되어 상부구조물의 동특성과 기기들의 지진응답에 영향을 줄 수 있다. 따라서 면진장치의 경년열화를 고려한 구조물의 지진응답을 분석하는 연구가 필요하다. 본 연구에서는 기존 문헌을 통하여 분석된 고무의 경년열화 특성을 사용하여 면진장치를 모델링하였다. 면진된 원전의 지진응답을 평가하기 위하여 격납건물과 보조건물을 대상 구조물로 선정하고, 진동수 성분이 다양한 입력지진동을 사용하여 구조물의 고유진동수, 최대지진응답, 층응답스펙트럼을 시간의 경과에 따라 분석하였다. 해석결과에 의하면 면진장치의 경년열화에 의하여 지진응답이 소폭 증가하였으며, 면진장치가 설치된 후 20년까지 지진응답의 증가율이 크게 나타나므로 이 기간에 상세한 검사가 시행되어야 할 것이다.

• 한국지역사회생활과학회지
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• 제21권2호
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• pp.201-210
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• 2010

Over the past few decades, the proportion of elderly people in Korea has been rapidly increasing. In particular, rural areas are experiencing aging of communities more rapidly compared to urban areas. However, public policy for the elderly does not respond to the needs of rural elderly. To distribute health care resources equitably, it is necessary to gather reliable information on the health status of the elderly. The purpose of this study is to explore factors affecting Korean elderly people's ADL functional status. The data sources are from 2004 Elderly Living Condition Survey. The Analysis sample consists of 3,278 cases. Analysis results show that there is a significant residential variability in education, monthly stipend, living arrangement, subjective health status, regular food in-take, and regular exercise. Logistic regression analysis results also show that 'cognitive ability'(exp(B)=6.603), 'subjective health status'(exp(B)=4.576), 'age'(exp(B)=2.610), and 'living arrangement'(exp(B)=.589) are factors affecting ADLs. Namely, when a respondent's cognitive ability is limited, subjective health status is poor, or if their age is over 75, the probability of having a limited ADL has been 6.6 times, 4.6 times, and 2.6 times higher than otherwise. Among these variables, cognitive ability was the best explanation. In contrast, respondents who live with a spouse or adult children have a lower probability of having limited ADL compared with those who live alone. Considering that the most critical criteria in determining eligibility for social welfare services is ADLs, the development of appropriate ADL assessment tools is in an urgent need. Without the accurate assessment on ADLs, particularly on rural as well as the urban elderly, it seems to be hard to achieve effectiveness in the health care policy for the elderly.