• 제목/요약/키워드: Long-term Aging

검색결과 448건 처리시간 0.028초

Effects of Dietary Treatment, Gender, and Implantation on Calpain/Calpastatin Activity and Meat Tenderness in Skeletal Muscle of Korean Native Cattle

  • Choi, B.H.;Ahn, B.J.;Kook, K.;Sun, S.S.;Myung, K.H.;Moon, S.J.;Kim, K.H.;Kim, J.H.
    • Asian-Australasian Journal of Animal Sciences
    • /
    • 제15권11호
    • /
    • pp.1653-1658
    • /
    • 2002
  • The objectives of this study were to examine calpain activity and meat tenderness by three different feeding patterns in Korean native cattle (KNC). Total forty-five animals were assigned each fifteen in long term restriction feeding (LTFR), long-term restriction feeding and hormone treatment (LTFR-tH), and short term non-restriction feeding (STFNR), respectively. Concentrate was restricted based on body weight in exp 1 and 2. However, it was fed ad libitum in exp. 3. Hormonal implantation was made with $M-PO^{TM}$ for bulls and with $F-TO^{TM}$ for heifers at 18, 20, 22 months of age in exp. 2. Animals were purchased (3-5 month old) from local cattle market and managed in two local farms and university research unit at three different years. Animals were slaughtered at 24 months for long-term trial and at 18 month for short term-trial. Loin and tender loin muscle was used for calpain activity and meat quality. Calpain proteolytic system was not changed by treatment. However, calpastatin activity was low in short-term trial. The calpain and calpastatin activity is reciprocal relationship, therefore, the high calpain activity may effect on quality grade. The shear force value was decreased as the processing of aging after postmortem. On the other hand, the cooking loss was significantly higher in short-term than in long-term trial, and then gradually decreased by the aging. Hormone implants to increase meat yield influenced to calpastatin activity more powerfully than calpain activity to meat tenderness. In meat color-a*, there was not significant difference in loin. Meat color-b* was decreased as postmortem aging time increased in tenderloin. Western blots were done to learn whether these proteins are degraded during postmortem storage and whether this degradation temporally parallels the decrease of shear force value. Vinculin was detected at 0 day and 1 day and degraded after 3 day. In conclusion, Calpain activity was affected slightly on meat tenderness. But meat tenderness was influenced by calpastatin, more effectively.

Prediction of Long-Term behavior of polyethylene pipe buried underground (지중매설 폴리에틸렌 관의 장기거동 예측)

  • Lee, Jae-Ho;Kim, Bin;Yoon, Soo-Hyun;Kim, Eung-Ho
    • Journal of Korean Society of Water and Wastewater
    • /
    • 제31권1호
    • /
    • pp.7-12
    • /
    • 2017
  • Most of existing buried pipes are composed of reinforced concrete. Reinforced concrete pipes have many problems such as aging, corrosion, leaking, etc. The polyethylene (PE) pipes have advantages to solve these problems. The plastic pipes buried underground are classified into a flexible pipe. National standard that has limited the long-term vertical deformation of the pipe to 5% for flexible pipes including PE pipe. This study presents a prediction for the long-term behavior of the polyethylene pipe based on ASTM D 5365. This prediction method is presented to estimate by using the statistical method from the initial deflection measurement data. We predict the behavior of long-term performance on the double-wall pipe and multi-wall pipe. As a result, it was found that the PE pipe will be sound enough more than 50 years if the compaction of soil around the pipe is more than 95% of the standard soil compaction density.

Analysis of Binder Aging Levels in Asphalt Mixture Caused by Short-term Aging Conditions Using the GPC Technique (GPC를 이용한 아스팔트 혼합물의 단기노화 조건에 따른 노화도 분석)

  • Kim, Yeongsam;Yun, Jiyeon;Jeong, Seungho;Kim, Kwangwoo
    • International Journal of Highway Engineering
    • /
    • 제18권3호
    • /
    • pp.1-9
    • /
    • 2016
  • PURPOSES : This study aims to show the difference of the binder aging level in the hot-mix asphalt (HMA) mixture after short-term aging (SA) under different aging conditions, such as mixture temperature and duration in hour. METHODS : Three SA times (i.e., 1 h, 2 h, and 4 h) at two temperatures (i.e., $160^{\circ}C$ and $180^{\circ}C$) were used for the normal mixtures prepared using a PG64-22 asphalt. The field long-term aging (LA) was simulated by applying the same LA procedure (65 h at $110^{\circ}C$) to all compacted specimens, prepared at the air void of 7% using each SA-treated mixture, in a convection oven. The binder aging level was measured in terms of large molecular size by gel-permeation chromatography (GPC) from the mixture and the absolute viscosity (AV) from the recovered binder. The aging levels were evaluated using those two properties after SA and LA, and then compared based on the normal SA (NSA) mixture (1 h at $160^{\circ}C$). The service life reduction caused by SA in various conditions was estimated based on the aging level of the field cores from different locations in various service lives. RESULTS : The results of the laboratory evaluation indicated that the binder of the mixture, which was treated at longer SA time and higher temperature, showed a significantly higher aging level than the NSA mixture. The binder aging level from a longer time, such as 2 h and 4 h SA, or at a higher temperature ($180^{\circ}C$), were estimated to be similar to that of the mixtures, which had already been in field service for several years. CONCLUSIONS : The HMA mixture should be produced at a moderate temperature, such as $160^{\circ}C$, and placed within a limited hauling and queuing time to avoid a significant short-term aging of the binder before placement in the field pavement. The SA for a longer time at a higher temperature than the NSA condition was found to be detrimental to the service life of the asphalt pavement.

An application and evaluation of Alzheimer's Garden Audit Tool(AGAT) to assess outdoor space of the long-term care facility in Korea (국내 노인전문시설 옥외공간 평가를 위한 외국도구(AGAT)의 적용 후 평가)

  • Tak, Young Ran;An, Ji Yeon;Jung, So Young
    • Journal of The Korea Institute of Healthcare Architecture
    • /
    • 제19권1호
    • /
    • pp.9-22
    • /
    • 2013
  • Purpose: The aging population is the quickly increasing in Korea. Since 2008, the National Long term Care Insurance, a number of long term care facilities have established during short time in Korea. Especially, the environmental assessment tool is important for managing healing environment in a long term care facility for the elderly. Alzheimer's Garden Audit Tool (AGAT) is used to assess whether a garden incorporates those elements and qualities as healing outdoor space. In this paper, we discuss the benefits, limitations, and future directions of the assessment tool for long-term care facilities. Methods : The AGAT audit was done through content analysis by 5 experts from diverse discipline as post occupancy evaluation of a long term care facility located in suburban area. The expert group was asked to describe their comments for modification and improvement in application of AGAT. Results : The results of this study show that it is necessary to refine the instrument's items to better meet the needs of the criteria and items for Korean culture-friendly tool. Especially, greenhouse elements (various plants, birds etc.), multisensory experiences, users-oriented space, programmed activities in garden, and hazards on pathway has somewhat limitation as measurement to assess outdoor of long-term care facilities in Korea. Implications : Consequently, AGAT could be applicable to evaluate the outdoor space of long term care facility in Korea with culturally sensitive revision.

A Comparative Study of Korea and Qingdao's Long-term Care Insurance Policy and its Enlightenment (청도와 한국의 장기요양보험 제도 비교연구와 시사점 검토)

  • Kim, Keunhong;MENG, Xiangqi
    • 한국노년학
    • /
    • 제38권3호
    • /
    • pp.453-466
    • /
    • 2018
  • The purpose of this study is to explore the enlightenment of the Korean long-term care insurance policy on Qingdao's long-term care insurance policy through policy comparison. China and Korea are very similar in terms of cultural background, living habits, and population structure. Therefore, the successful experience of Korean long-term care insurance has great implications for Qingdao even China to build a long-term care insurance system. Through the literature review, this article compares the long-term care insurance policy implemented by Qingdao City and Korea in Gilbert & Terrell's social welfare policy analysis framework. With the comparison this article discusses about the existing problems of the current pilot policy system in Qingdao, such as lack of legislation support and financial independence, assessment standards are not detailed, and human resources are insufficient. The author raises five suggestions to improve Qingdao's long-term care policy as the conclusion of this paper: legislation support, detailed assessment standard, expand categories of benefits, enrich delivery network, optimize financing sources.

A study on the change of microstructural and mechanical properties by the long-term thermal aging of dissimilar metal welds in nuclear power plants (원전 이종금속 용접부의 장기 열적 시효에 따른 미세조직 및 기계적 특성변화에 관한 고찰)

  • Choi, Kyoung Joon;Yoo, Seung Chang;Kim, Ji Hyun
    • Transactions of the Korean Society of Pressure Vessels and Piping
    • /
    • 제10권1호
    • /
    • pp.82-89
    • /
    • 2014
  • In this study, the metallurgical analysis and mechanical property measurement have been performed to investigate the effect of long-term thermal aging on the microstructural evolution in the fusion boundary region between weld metal and low alloy steel in dissimilar metal welds. A representative dissimilar weld mock-up made of Alloy 690-Alloy 152-A533 Gr. B was fabricated and aged at $450^{\circ}C$ for 2,750 hours. The microstructural characterization was conducted mainly near in a weld root region by using optical microscopy, scanning electron microscopy, transmission electron microscopy. And the mechanical properties were measured with Vickers microhardness test and nanoindentation method. A steep gradient was shown in the chemical composition profile across the interface between A533 Gr. B and Alloy 152. Type-II boundaries were found in weld side of DMW and the hardness was the highest at the narrow zone between Type-II boundary and fusion boundary.

A Study on the Ultraviolet Aging Characteristics of Outdoor Polymeric Insulating Materials (옥외용 고분자 절연재료의 자외선 열화특성 연구)

  • Kim, Yeong-Seong;Jeong, Sun-Ok
    • Korean Journal of Materials Research
    • /
    • 제9권4호
    • /
    • pp.409-413
    • /
    • 1999
  • Recently, the polymeric insulators have been accepted in several countries for the outdoor high voltage applications. In comparison with the conventional porcelain, polymeric insulators offer various advantages such as light weight, superior vandal resistance and better contamination performance. The outdoor polymeric insulating materials such as silicone rubber, ethylene propylene diene monomer(EPDM), ethylene vinyl acetate(EVA) and epoxy are aged such as silicone rubber, ethylene propylene diene monomer(EPDM), ethylene vinyl acetate(EVA) and epoxy are aged under the various natural environment with the long-term performance in outdoor. In this paper, the effects of UV-under the various natural environment with the long-term performance in outdoor. In this paper, the effects of UV-ray on the surface of silicone rubber were investigated by using the weather-Ometer. The accelerated aging stresses were simulated by UV radiation, high temperature and humidity as well as water spray. These aging characteristics were examined through contact angle measurements, tracking resistance test, FT-IR and SEM/EDS analysis. The experimental results showed that tracking resistance decreases with increase in the UV-ray irradiation period. But the surface of silicone rubber kept hydrophobicity. It is found that the inorganic filler such as)$ Al(OH_3$ improves tracking resistance and the $Tio_2$is very effective in preventing degradation of silicone rubber surface from UV-ray.

  • PDF

A Study on the Support System of the Elderly in Japan for the Realization of Aging in Place (에이징 인 플레이스 실현을 위한 일본의 고령자 지원체계 연구 - 지역포괄케어시스템의 구축을 중심으로 -)

  • Yoon, Hye-Yeong
    • Journal of the Korean housing association
    • /
    • 제25권2호
    • /
    • pp.99-107
    • /
    • 2014
  • This study attempts to provide implications for developing more efficient and effective community-based support system with AIP perspective for the elderly in Korea. The main purpose of this study is to analyze Japan's community-based integrated care system that respond to the concept of aging in place (AIP) and its cases. In Japan, they have offered Community-Based Service since 2005, and the advanced system which include integrated support categories and consolidated community/local resources will started in 2015 by The revision of Long-term Care Insurance policy, 2012. The result of policy analysis and case studies are as follows: 1) The suggestion for ideal support system model promoted a relationship of multiple agents include private sectors even resident and senior and specified responsibility sharing, 2) the system proposed Not only health and medical care support, living care and residence are also addressed as a comprehensive support. and 3) the amount of available community resource is different by each local government, but the effort to get the understanding of community residents and to connect with a potential community resource is also essential aspect to set effective community-based support system.

A Study on Welfare Policy for the Aged for the Elderly and Jeong Yak-Yong's Awareness in the Mokminsimseo

  • Kim, Kyung Hwan;Kim, Taek
    • International Journal of Advanced Culture Technology
    • /
    • 제10권2호
    • /
    • pp.79-85
    • /
    • 2022
  • Article 10 of the Constitution All citizens have dignity and values as humans and have the right to pursue happiness. There is a need for support measures such as a means to realize the respect of dignity and values as humans, and how to efficiently maintain policies on welfare for the elderly classified as the socially disadvantaged. It was considered necessary to develop an elderly-friendly city for economic, physical, and social life. Dasan Jeong Yak-yong's respect for adults was to practice the ideology of Confucianism, so this was the most important thing in the past Joseon Dynasty. In particular, it was considered important to think of adults first in practicing filial piety.This study focuses on the long-term care insurance system for the elderly, one of the welfare policy measures for the elderly. The significance of implementing the long-term care insurance system for the elderly is to benefit not only the elderly, but also all generations, including the middle-aged and children who were in charge of long-term care. To this end, the government should properly manage the factors of the social insurance financial crisis caused by the low birth rate and aging population.In addition, concerns about health insurance are high, so it is necessary to secure an appropriate level of government budget for health insurance financial management and minimize unnecessary non-benefit. In addition, it is necessary to induce appropriate medical use through connection with construction medical insurance.