• 제목, 요약, 키워드: Aging

검색결과 8,653건 처리시간 0.044초

Incorporating Station Related Aging Failures in Bulk System Reliability Analysis

  • Billinton Roy;Yang Hua
    • KIEE International Transactions on Power Engineering
    • /
    • v.5A no.4
    • /
    • pp.322-330
    • /
    • 2005
  • This paper proposes methods to incorporate station related aging failures in composite system reliability assessment. Aging failures of station components, such as circuit breakers and bus bars, are a major concern in composite power system planning and operation as an increasing number of station components approach the wear-out phase. This paper presents probabilistic models for circuit breakers involving aging failures and relevant evaluation techniques to examine the effects of station related aging outages. The technique developed to incorporate station related aging failures are illustrated by application to a small composite test system. The paper illustrates the effects of circuit breaker aging outages on bulk system reliability evaluation and examines the relative effects of variations in component age. System sensitivity analysis is illustrated by varying selected component parameters. The results show the implications of including component aging failure considerations in the overall analysis of a composite system.

대학생의 노화 지식, 노인에 대한 태도 및 노인 부양 의식 (A study on Aging Knowledge, Attitudes and Awareness about Supporting the Aged in Undergraduate Students)

  • 양야기
    • 한국간호교육학회지
    • /
    • v.19 no.4
    • /
    • pp.498-507
    • /
    • 2013
  • Purpose: This study was conducted to investigate the relationship of aging knowledge, attitudes and awareness about supporting the aged in undergraduate students. Method: The participants were 385 undergraduate students in H University in G city. Data were collected from March 1 to April 30, 2012, and analyzed using SPSS/WIN 18.0. Results: The mean of the aging knowledge score was 51.40, the mean of aging attitudes score was 3.06, and the mean of awareness about supporting the aged score was 4.11. Awareness about supporting the aged showed a positive correlation with aging knowledge (r=.299, p<.001). Awareness about supporting the aged showed a positive correlation with aging attitudes (r=.244, p<.001). Conclusion: The findings of this study indicate a need to develop programs for undergraduate students to increase correct aging knowledge, to encourage appropriate aging attitudes and awareness about supporting the aged. In addition, the need for further studies to examine effects of programs are needed.

고령사회 대응 연구개발 지원방안 연구 (A Study on R&D program for the aging society)

  • 유재성
    • 대한안전경영과학회지
    • /
    • v.18 no.3
    • /
    • pp.109-116
    • /
    • 2016
  • The purpose of this study is to explore the research and development(R&D) programs for effectively response of population aging. We analyzed of aging-related R&D support status by National Science and Technology Information Services(NTIS) and reviewed of foreign aging-related R&D programs. It was found that the overall lack of support systems, the R&D support status for Korea's aging society is very low performance and the difference appears in the annual support status, etc. It is very important to enhance the effectiveness of R&D programs in order to effectively prepare for aging society. I suggested support measures of the R&D for aging society by survey research. The result of this study will help in planning of the R&D for aging society and contribute to increasing of welfare for the aged.

How Environmental Agents Influence the Aging Process

  • Karol, Meryl H.
    • Biomolecules & Therapeutics
    • /
    • v.17 no.2
    • /
    • pp.113-124
    • /
    • 2009
  • Aging is a multifaceted biological process that affects all organs and organ systems of the body. This review provides an up-to-date analysis of this highly exciting, rapidly changing field of science. The aging process is largely under genetic control but is highly responsive to diverse environmental influences. The genes that control aging are those that are involved with cell maintenance, cell damage and repair. The environmental factors that accelerate aging are those that influence either damage of cellular macromolecules, or interfere with their repair. Prominent among these are chronic inflammation, chronic infection, some metallic chemicals, ultraviolet light, and others that heighten oxidative stress. Other environment factors slow the aging process. Included among these agents are resveratrol and vitamin D. In addition, dietary restriction and exercise have been found to extend human lifespan. The various mechanisms whereby all these agents exert their influence on aging include epigenetic modification, chromatin maintenance, protection of telomeres, and anti-oxidant defense, among others. The complex process of aging remains under continued, intense investigation.

CURRENT STATUS AND PROSPECT FOR PERIODIC SAFETY REVIEW OF AGING NUCLEAR POWER PLANTS IN KOREA

  • Jin, Tae-Eun;Roh, Heui-Young;Kim, Tae-Ryong;Park, Young-Sheop
    • Nuclear Engineering and Technology
    • /
    • v.41 no.4
    • /
    • pp.545-548
    • /
    • 2009
  • Korean utility has utilized a Periodic Safety Review (PSR) that assesses the cumulative effects of plant aging, modifications, operating experience, technical developments, and site characteristics since 2000. In particular, the assessment and management of plant aging is one of the major areas in PSR. It includes identification of critical Systems, Structures, and Components (SSCs) for aging, assessment of aging effects, and implementation of aging management programs. Since the PSR system was introduced based on the atomic energy acts and related laws, PSRs of eight sets for 12 Nuclear Power Plants (NPPs) that have been operating more than 10 years have been completed. PSRs of two sets for 4 NPPs are currently being carried out. The utility has confirmed that domestic NPPs have been operated safely through these PSRs and have implemented the follow-up corrective activities to increase the nuclear safety. In this paper, the status of PSR implementation is discussed and improvement programs to conduct PSR follow-up corrective activities efficiently for NPPs are suggested based on experiences with aging assessments.

Aging 효과에 따른 모래의 비배수 정적전단거동 특성 (Characteristics of Undrained Static Shear Behavior for Sand Due to Aging Effect)

  • 김영수;김대만
    • 한국지반공학회논문집
    • /
    • v.20 no.6
    • /
    • pp.137-150
    • /
    • 2004
  • 모래의 aging 현상은 점성토에 비하여 무시할 정도로 매우 작아서 최근까지 연구되지 않았다. 그러나 퇴적이나 교란 후 시간경과에 따라 관입저항치의 증가가 관찰되면서 현장시험을 중심으로 모래의 aging 효과에 대하여 활발한 조사가 이루어졌고, 최근에는 현장시험뿐만 아니라 실내시험에서도 여러 연구자들에 의해 모래의 aging 효과가 규명 되어지고 있다. 본 연구에서는 모래의 비배수 정적전단거동에 대한 aging 효과를 살펴보기 위해 낙동강 모래를 이용하여 상대밀도 $(D_r)$, 압밀응력비$(K_c)$ 그리고 압밀시간을 달리하여 비배수 정적삼축압축시험을 실시하였다. 그 결과 응력-변형률의 탄성구간내 탄성계수가 압밀시간 경과에 따라 증가하는 것으로 나타났으며, 또한 상전이점 강도$(S_{PT})$와 한계응력비점 강도$(S_{CSR})$도 압밀시간 경과에 따라 증가하였다. 그러나 간극수압비$(u/{p_c}')$는 압밀시간에 비례하게 감소하는 등 모래의 정적전단에서 나타나는 aging 효과를 관찰할 수 있었다.

노화 분자마커로서 노화기전에 관여하는 타켓 단백질 (Target Proteins Involved in Aging Mechanism as an Aging Molecular Marker)

  • 김문무
    • 생명과학회지
    • /
    • v.26 no.8
    • /
    • pp.983-989
    • /
    • 2016
  • 체내를 구성하는 모든 세포는 시간이 흐름에 따라 그들의 주위환경에 좌우되어 분화, 괴사, 세포자살, 세포노화와 같은 운명을 경험한다. 이러한 세포과정에서 발생하는 실수가 암, 염증, 노화 및 질병과 같은 표현형에서의 여러가지 이상을 발생시킨다. 천연물로부터 유래한 항 노화 화합물을 탐색하기 위해서는 새로운 전략과 접근방식이 요구된다. 그러므로, 여기서는 핵심적인 역할을 하는 타켓 단백질에 대하여 설명한다. 먼저 기질금속단백질분해효소(MMPs)는 노화마커로 암전이, 만성염증 및 피부노화에 관여한다. 특히 히스톤 탈아세틸화효소(HDACs)는 모델동물의 수명을 연장시키려고 노력하는 노화연구원들에게 큰 관심의 대상이다. 뿐만 아니라, 여기서 p53, IGF-1 및 SIRT1이 중요한 역할을 하는 세포노화와 관련된 신호경로에 대하여 기술한다. 더욱이, 자가포식과정이 노화와 관련한 신호경로에도 관여하고 있다. 세포노화의 신호경로를 조절할 수 있는 여러가지 새로운 화합물도 본 총설논문에서 소개된다. 여기서 우리는 노화기전에 대한 분자기반 및 노화마커 개발에 대한 새로운 통찰력을 제공하려고 한다. 뿐만 아니라 소개되는 화합물은 노화와 관련 있는 질병의 예방 및 치료를 위하여 의학적으로 응용이 가능하다.

Dry aging of beef; Review

  • Dashdorj, Dashmaa;Tripathi, Vinay Kumar;Cho, Soohyun;Kim, Younghoon;Hwang, Inho
    • Journal of Animal Science and Technology
    • /
    • v.58 no.5
    • /
    • pp.20.1-20.11
    • /
    • 2016
  • The present review has mainly focused on the specific parameters including aging (aging days, temperature, relative humidity, and air flow), eating quality (flavor, tenderness and juiciness), microbiological quality and economic (shrinkage, retail yields and cost) involved beef dry aging process. Dry aging is the process where beef carcasses or primal cuts are hanged and aged for 28 to 55 d under controlling environment conditions in a refrigerated room with $0^{\circ}$ to $4^{\circ}C$ and with relative humidity of 75 to 80 %. However there are various opinions on dry aging procedures and purveyors of such products are passionate about their programs. Recently, there has been an increased interest in dry aging process by a wider array of purveyors and retailers in the many countries. Dry aging process is very costly because of high aging shrinkage (6 to 15 %), trims loss (3 to 24 %), risk of contamination and the requirement of highest grades meat with. The packaging in highly moisture-permeable bag may positively impact on safety, quality and shelf stability of dry aged beef. The key effect of dry aging is the concentration of the flavor that can only be described as "dry-aged beef". But the contribution of flavor compounds of proteolysis and lipolysis to the cooked dry aged beef flavor is not fully known. Also there are limited scientific studies of aging parameters on the quality and palatability of dry aged beef.

중년여성의 노화관리 프로그램이 회복탄력성과 성공적 노화에 미치는 영향 (Effects of an Aging Management Program for Middle-aged Women on Resilience and Successful Aging)

  • 정혜윤;성경미
    • 여성건강간호학회지
    • /
    • v.25 no.4
    • /
    • pp.392-408
    • /
    • 2019
  • Purpose: The purpose of this study was to examine the effects of an aging management program on the resilience and successful aging of middle-aged women. Methods: A quasi-experimental study with a non-equivalent control and pre-post test design was used. The participants were 39 middle-aged women living in urban areas in Korea. The experimental group (n=22) received the aging management program for a total of 10 weeks, 90 minutes to 120 minutes per week. The aging management program consisted of strategies to enhance the behavior, promotion conditions, and habits of the program, including various activities for middle-aged women. The data were analyzed using χ2 tests, independent t-tests, and repeated measures analysis of variance with the SPSS/WIN 21.0 program. Results: The resilience score of the experimental group was significantly higher level than the score of the control group in the time-to-group interactions (F=3.70, p=0.029). The successful aging score of the experimental group was significantly higher than the score of the control group in the time-to-group interactions (F=5.86, p=0.004). However, the sub-hypotheses of resilience (self-regulation and interpersonal relationships) and successful aging (physical aging adaptation and psychological age adaptation) were partially accepted. Conclusions: The aging management program for middle-aged women was identified as an effective intervention for promoting resilience and successful aging in middle-aged women. Therefore, this suggests that the aging care program could be a useful intervention program to improve the mental health of middle-aged women living in communities.

Electric Field Induced Super-cooling System for Long Term Dry-aged Beef Loin

  • Park, Sin-Young;Kim, Hack-Youn
    • 한국축산식품학회지
    • /
    • v.40 no.2
    • /
    • pp.286-296
    • /
    • 2020
  • This study investigates the utilization of an electric-field-induced super cooling system in long-term dry aging of beef loin. Analyzed quality properties of dry-aged beef loin applied with electric field refrigeration (EFR) versus commercial refrigeration (CR). Quality properties was including aging loss, pH, water holding capacity (WHC), cooking loss, color, warner-bractzler shear force (WBSF), total plate count (TPC), and thiobarbituric acid reactive substances (TBARS). Aging loss of wk 1 EFR was significantly lower than CR (p<0.05). pH of EFR was slow change tendency compared CR. WHC of both aging methods were higher with increase in aging duration. Cooking loss of wk 1, 2, 4, and 10 EFR were significantly lower than CR (p<0.05). Lightness and redness of EFR was slow change tendency compared CR. However, yellowness of EFR was increased until wk 2, 3, and significantly decreased at wk 10 (p<0.05), but yellowness of CR was decreased until wk 3 and significantly increased with an increasing aging weeks (p<0.05). Both aging methods of WBSF was decreased with increase in aging weeks; however, wk 10 of CR was significantly lower than EFR (p<0.05). TPC after wk 3 EFR groups were significantly lower than CR groups (p<0.05), and TBARS of EFR groups were significantly lower than CR (p<0.05). The present results show that application of the EFR system for dry aging beef loin can extends its shelf life and induce changes of several aging properties in similar to commercial aging.