• Title, Summary, Keyword: Aging

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Performance Evaluation of Polymer Insulator using Tracking Wheel and Multi-Aging Test (트래킹 휠과 복합열화시험에 의한 폴리머 애자의 성능 평가)

  • 조한구;안명상;한세원;허종철;이운용
    • Proceedings of the Korean Institute of Electrical and Electronic Material Engineers Conference
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    • pp.119-122
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    • 2000
  • Recently polymer insulators are being used for outdoor high voltage applications. Polymer insulators for transmission line have significant advantages over porcelain and glass insulators, especially for ultra-high voltage transmission lines. Their advantages are light weight, vandalism resistance and hydrophobicity. Polymer insulators are a relatively new technology, but their expected life is still unknown. Therefore these estimating technique are very important. Their life time is related to weathering and operating condition. Multi-aging test is requested because aging factor is occurred by multi-aging than unique aging. The aging test about polymer insulators have mainly carried out by IEC 61109. This paper presents multi-stress chamber experiments and tracking wheel test to examine the tracking and erosion performance of polymer insulator for transmission. Multi-stress testing is able to demonstrate deficiencies of polymer insulator materials and designs, including the nature of interfaces in insulation design. We have investigated IEC 61109 Annex C (5000h aging test) and CEA tracking wheel test as test methods of artificial accelerated aging. The aging degree of polymer insulator is estimated by leakage current, measurement of hydrophobicity degree, damage conditions of insulator surface, withstand voltage test etc.

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PRECIPITAlON BEHAVIOR OF 8090 ALUMINIUM ALLOY BY HERMOMECANICAL AND DUPLEX AGING TREAMENT (가공열처리 및 2단시효처리에 의한 8090알루미늄 합금의 석출거동)

  • Lee, Hag-Yong;Kim, Sug-Woo;Woo, Kee-Do
    • Journal of the Korean Society for Heat Treatment
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    • v.7 no.4
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    • pp.270-276
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    • 1994
  • The effects of thermomechanical and duplex aging treatment on precipitation behavior were investigated for the 8090 aluminium alloy by tensile test, hardness test, plane-strain fracture toughness test and electron microscope. Both pre-aging stretch and duplex aging with pre-aging stretch were effective to homogenize the distribution of S' phase in this alloys. The latter makes more homogeneous distribution of S' phase than that of the former, but the sizes of S' phase in both specimens are almost same. The size and distribution of 0' phase were not changed by thermomechanical or duplex aging treatment. The strength was increased by thermomechanical treatment, but the elongation was decreased. Duplex aging treatment couldn't change the strength and elongation. Pre-aging stretch and duplex aging with pre-aging stretch have same effect on the strength and elongation. The increase of strength by thermomechanical treatment in 8090 alumunium alloy was caused by homogeneously precipitated S' phase.

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A Study on Anxiety about Aging of Middle Aged and Elderly Women (중년 이후 여성의 노화에 대한 불안감)

  • Kim, Eun-Ha
    • The Journal of Korean Academic Society of Nursing Education
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    • v.13 no.2
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    • pp.192-202
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    • 2007
  • Purpose: This study was to examine the degree of anxiety about aging for middle aged and elderly women and to identify the overall degree of anxiety about aging and general characteristics of middle aged and elderly women. Method: The subjects of the study were 674 women who lived in Busan city, Korea. The sampling was at the researcher's convenience and data was collected from April to August, 2007. The instrument for the study was questionnaires consisting of the general characteristics, and Anxiety about Aging for Elderly by Watkins, Coates, and Ferroni(1998). Descriptive statistics, t-test or ANOVA with Scheffe's test were used for data analysis. Result: The results of this research were as follows: The mean score of anxiety about aging was 50.32$\pm$5.75. The results reveal that middle aged women are more anxious about aging than old women. Anxiety about aging was the most common psychological dimension of the six factors. According to the general characteristics, there was a significant difference in education, subjective economic status, composition of family and job status in anxiety about aging. Conclusion: The results of this study help in explaining psychological health. In addition, development of adequate interventions to decrease anxiety about aging in women is needed.

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Cross-Cultural Study of Successful Aging in Korean and Western Society (한국사회와 서구사회의 성공적 노화의 구성요소에 대한 비교 문화적 연구)

  • Paik, Jee-Eun;Choi, Hye-Kyoung
    • Journal of Korean Home Management Association
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    • v.25 no.2
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    • pp.137-153
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    • 2007
  • The purpose of this study was to explore the similarities and differences of elements of successful aging in Western and Korean society using a background of time and dominant values of each society. Content analysis of concepts and components of 'successful aging' was performed based on 12 Korean articles and 23 Western articles. The major findings were: (1) The studies of successful aging accomplished since 2001 and the studies that explore the elements of successful aging perceived by the elderly mentioned diverse elements as essential to successful aging. (2) There were both common and distinct components of successful aging in Western and Korean society. Some of the essential components for successful aging were commonly accepted, but others were varied and unique, reflecting the period of experience and cultural values. These results could be used to better understand unique successful aging of the Korean elderly, as well as to establish a basis of intervention that meets the specific demands of this population.

The Analysis of Older Driver's Traffic Accident Characteristic at Express-way using Logit model (로짓모델을 이용한 고령운전자 고속도로 교통사고 특성 분석 연구)

  • Park, Jun-Tae;Kim, Young-Suck;Lee, Soo-Beom
    • International Journal of Highway Engineering
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    • v.11 no.4
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    • pp.1-7
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    • 2009
  • Traffic accident by aging drivers is expected to be on the rise rapidly as the number of aging drivers is rising along with the aging trend being progressed. In this study, traffic accident features depending on the classification of aging population and non aging one was evaluated. As a result of this evaluation, effect factors influencing over the aging population was found to be expressed differently from that of the non aging one. Odds ratio between the aging population and non aging one was evaluated through logit model and a model with potential accident probability of the aged drivers was developed. Accident risk of the aged drivers under the condition of curved road, cutting section and moistured road was revealed to be higher than that of the non aging population.

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Development and Evaluation of Online Aging and Health Management Education for Undergraduate Students (대학생을 위한 온라인 노화와 건강관리 교육의 개발 및 평가)

  • Park, Myong-Hwa
    • Journal of Korean Academy of Nursing
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    • v.37 no.4
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    • pp.540-548
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    • 2007
  • Purpose: The purpose of this study was to develop online aging and health management education for undergraduate students and to evaluate its effects analyzing the differences in knowledge and attitude toward aging and the elderly. Method: An Online aging and health management education program was established through analysis, planning, content framing and production, program application, and evaluation stages. The study sample consisted of 98 undergraduate students in one university in D city. The instruments used were FAQ I for knowledge of aging and a 20 item semantic differential scale for attitude toward aging and the elderly Results: The results of this study were as follows. First, undergraduate students' knowledge level was low and attitudes were negative at the baseline. Second, after the class, knowledge scores improved significantly from 14.44 to 20.12. In addition, the attitudes toward elderly and aging changed from negative to a more positive way showing a 23.57 point difference. Conclusion: This study shows that the online aging and health management education program was an effective educational method to improve knowledge and attitude of aging for the young generation such as college students.

An Analysis of Urban Preference in Urban type Elderly Housing in Aging in Place - Around Housing Survey and Future Population Projection and Elderly Survey -

  • Kang, Moon-Chul;Kim, Young-Hoon
    • KIEAE Journal
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    • v.17 no.5
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    • pp.5-14
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    • 2017
  • Purpose: In korea, Aging in Place is underway as an alternative to elderly housing for the aging population. Currently, research is being actively conducted mainly for the baby boomer generation and older generation. There is not much research on various ages that will be needed continuously in elderly housing and aging in place in the future. Therefore, this study suggests aging in place of urban elderly housing through analysis of urban preference of all ages. Method: An analysis of prior studies related to elderly housing, Field interpretation about Aging in Place, An analysis of the city preference through the survey of the elderly, Existing Literature Survey, Housing Survey, Future Population Projection, Survey of the elderly and confirmed the necessity of the Aging in Place of urban elderly housing. Result: As there are many generations living in the city and many people prefer it, studies on urban elderly housing should be actively conducted and should be studied as Aging in Place that can be used for all ages. In addition, it is necessary to study the advantages and disadvantages of using Aging in Place in the city through domestic or overseas case analysis.

Early Germination Response of Soybean Seed to Accelerated Aging and Low Dose Gamma Irradiation

  • Hwangbo, Jun-Kwon;Kim, Jae-Sung;Lim, Ji-Hyeok;Baek, Myung-Hwa;Chung, Byung-Yeoup;Kim, Jin-Hong
    • KOREAN JOURNAL OF CROP SCIENCE
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    • v.49 no.1
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    • pp.25-29
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    • 2004
  • The responses of soybean seeds were evaluated to accelerated aging and gamma irradiation with regard to germination, seed leakage, seed leachate component and dry weight of hypocotyl and primary root of the germinating seed. Accelerated aging significantly reduced the final germination rate while gamma irradiation increased the final germination rate. Furthermore, the interactive effects occurred that the final germination rate of 5-day aged seeds increased considerably in response to 4 Gy of gamma irradiation. The extent to which the electrolyte was leaked from the seeds (conductivity) was significantly affected by accelerated aging and showed a close negative correlation with the germination rate. Gamma irradiation, however, did not significantly affect the electrical conductivity of seed leachate. The accelerated aging significantly increased the concentrations of the particular electrolytes leaked from the seeds while the gamma irradiation did not affect those concentrations. Of the electrolytes leaked from the seeds, Ca and Mg showed relatively lower concentrations while K showed greater concentrations than others. Moreover, N and P showed similar responses to aging treatment. Aging treatment significantly affected dry weight (DW) of hypocotyls and primary root. Also, gamma irradiation decreased DW of hypocotyls and primary root, particularly for 8 Gy associated with 5 days aging treatment. The data were discussed in terms of the relationships of seed vigor with aging treatment and gamma irradiation.

Evaluation of Nuclear Plant Cable Aging Through Condition Monitoring

  • Kim, Jong-Seog;Lee, Dong-Ju
    • Nuclear Engineering and Technology
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    • v.36 no.5
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    • pp.475-484
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    • 2004
  • Extending the lifetime of a nuclear power plant [(hereafter referred to simply as NPP)] is one of the most important concerns in the global nuclear industry. Cables are one of the long-life items that have not been considered for replacement during the design life of a NPP. To extend the cable life beyond the design life, it is first necessary to prove that the design life is too conservative compared with actual aging. Condition monitoring is useful means of evaluating the aging condition of cable. In order to simulate natural aging in a nuclear power plant. a study on accelerated aging must first be conducted. In this paper, evaluations of mechanical aging degradation for a neoprene cable jacket were performed after accelerated aging under tcontinuous and intermittent heating conditions. Contrary to general expectations, intermittent heating to the neoprene cable jacket showed low aging degradation, 50% break-elongation, and 60% indenter modulus, compared with continuous heating. With a plant maintenance period of 1 month after every 12 or 18 months operation, we can easily deduce that the life time of the cable jacket of neoprene can be extended much longer than extimated through the general EQ test. which adopts continuous accelerated aging for determining cable life. Therefore, a systematic approach that considers the actual environment conditions of the nuclear power plant is required for determining cable life.

Effect of Aging Treatment on the Mechanical Properties and Damping Capacity of 12Cr Heat Resistant Steel with Ferrite Phase (페라이트 상을 갖는 12Cr 내열강의 기계적성질 및 감쇠능에 미치는 시효처리의 영향)

  • Kang, C.Y.;Choi, H.G.;Park, H.K.;Sung, J.H.;Lee, D.H.
    • Journal of the Korean Society for Heat Treatment
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    • v.24 no.1
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    • pp.23-30
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    • 2011
  • This study was carried out to investigate the effect of aging treatment on the mechanical properties and damping capacity of 12Cr heat resistant steel with ferrite phase. While hardness values in ferrite phase was not changed, that in martensite phase was dramatically dropped in early stage of aging treatment and then gradually decreased with increase of aging time. As aging treatment was carried out, the precipitation was not detected in ferrite phase, while carbides were precipitated in martensite phase. With increasing the aging time, tensile strength eventually decreased while impact toughness increased rapidly in the early stage of aging and then gradually increased. Besides, it was confirmed that damping capacity was not changed in the early stage of aging and then gradually increased with increase of aging time.