• 건강소식
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• v.34 no.6
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• pp.14-15
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• 2010

어머니의 손맛이 예전 같지 않고 짜거나 맵거나 달다면 노년이 되었다는 결정적인 증거이다. 나이가 들어감에 따라 신체가 노화되고 미각 세포의 기능이 저하되어 맛에 대한 감각이 떨어졌기 때문이다. 미각이 떨어졌다는 것은 노년 건강을 위한 식탁관리가 되어야 한다는 말이기도 하다. 노년에는 영양상태가 건강상태를 좌우하는 결정적인 요인인데 노년이 되면 미각 저하는 물론, 식사와 직접적인 관련이 있는 장기 기관의 능력이 저하되어 올바른 영양상태를 유지하기 어렵게 되기 때문이다. 미각이 떨어진 노년기의 식탁관리에 대해서 알아본다.

• Proceedings of the Korean Society of Fisheries Technology Conference
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• 2000.05a
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• pp.192-193
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• 2000

우리나라 연안해역은 생물생산력이 높아 연안 양식어업이 옛부터 성행되어 왔다. 그러나 주변의 임해공단 건설과 인구집중화 현상, 집약적이고 장기적인 사용으로 인한 어장의 노화 및 그 수역의 환경조건하에서 한정된 먹이생산량에 비하여 양식시설의 과다설치로 인한 양식생물의 가용먹이량 저하 등으로 연안어장은 생산력이 날로 저하되고 있다. (중략)

• Proceedings of the Korean Society of Fisheries Technology Conference
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• 2000.05a
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• pp.508-509
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• 2000

우리나라의 굴 양식업은 1970년대 수하식 굴 양식기술 개발보급으로 계속 증대 발전하였으나, 연안의 산업화와 도시화에 의한 수질환경 악화 그리고 장기간의 집약적 양식에 의한 어장 노화와 양식 굴의 품종 열화 등에 원인하여 1990년대에 들어서면서 양식 생산량이 점차 감소하는 경향을 보이고 있다. 따라서 굴 양식의 지속적 생산 방안의 모색을 위하여 환경 적응력이 강한 굴 품종을 선발하고 변화된 어장환경을 이해하고자, 산지별 굴의 양성 해역별 양성시험을 실시하여 굴의 성장도, 비만도 및 생존율의 비교 조사와 그리고 환경조사 등을 실시하였다. (중략)

• Journal of the Korean Society of Hazard Mitigation
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• v.8 no.3
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• pp.51-58
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• 2008

Development of a new design guide which is based on empirical-mechanistic concept for pavement design is in action. It is called AASHTO 2002 Design Guide in USA and the KPRP(Korean Pavement Research Project) in Korea. The material characteristic of hot mix asphalt is a key role in the design guide. Therefore it is urgent to get a proper materials database, especially the dynamic modulus of hot mix asphalt. In this research, dynamic modulus test, which is based on aged asphalt binder, has been carried out and proposed the predicted equation of dynamic modulus. Nine different hot mix asphalt with three different asphalt binder have been used for the dynamic modulus test. Short-term aging, which is covers the time for the production of asphalt plant, transportation, lay-down, and compaction, can be simulated at $135^{\circ}C$ with 2 hour curing. Long-term aging has been carried out for a performance period of asphalt pavement. The dynamic modulus of asphalt pavement increases with aging time. As the nominal aggregate size increases, the change of dynamic modulus is not big.

• Journal of the Korea Academia-Industrial cooperation Society
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• v.17 no.10
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• pp.458-470
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• 2016

The purpose of this study was to understand and describe nurses' recognition regarding successful aging of hospitalized elderly in long-term care hospitals. Data were collected using focus group interviews in 2016. Three focus group interviews were held in three long-term care hospitals, and a total of 14 nurses participated. All interviews were recorded and transcribed as they were spoken, and data were analyzed using qualitative content analysis. A total of 25 concepts were identified, 15 subcategories, and five major categories emerged from the analysis. The five categories of the nurses' recognition about successful aging of hospitalized elderly in long-term care hospitals were "adjusting themselves to a lifestyle of long-term care hospital," "living positively in each situation," "communicating with each other and making a relationship," "obtaining interest and support of their families," and "maintaining economic independence". Therefore, further qualitative study will be performed and compared with this study results on successful aging of hospitalized elderly in long-term care hospitals. Moreover, based on these study results, it is necessary to develop and apply programs for successful aging of hospitalized elderly in long-term care hospitals.

• Journal of Life Science
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• v.29 no.1
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• pp.112-117
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• 2019

Herbal medicines are widely used as therapeutic products in many countries. Corni fructus (CF), the dried ripe sarcocarp of Cornus officinalis Sieb. et Zucc (Cornaceae), has been used for thousands of years in traditional medicine and has been reported to be effective for the prevention and treatment of various diseases, such as kidney diseases and diabetes. Recent research on CF has documented a wide spectrum of therapeutic properties, which include anti-inflammatory, ant-oxidative, immunomodulatory, and anti-cancer effects. However, there is no information on its safety. Therefore, in this study, the toxicity of water extract of CF to ICR mice was investigated. The mice received a single dose of water extract of CF (1,000, 2,000, and 5,000 mg/kg of body weight) via the oral route. Mortality, clinical signs, body weight changes, gross findings, and weights of the principal organs after 14 d were then assessed. The results revealed no adverse effects of CF as determined by clinical signs, body weights, or organ weights and no gross pathological findings in any of the treatment groups. These results suggest that the 50% lethal dose and approximated lethal dose of CF extract is over 5,000 mg/kg. The findings provide scientific evidence for the safety of CFs.

• Journal of the Korean Solar Energy Society
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• v.37 no.4
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• pp.35-47
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• 2017

Energy efficiency solutions are being pursued as a sustainable approach to reducing energy consumption and related gas emissions across various sectors of the economy. Vacuum Insulation Panel (VIP) is an energy efficient advanced insulation system that facilitates slim but high-performance insulation, based on a porous core material evacuated and encapsulated in a barrier envelope. Although VIP has been applied in buildings for over a decade, it wasn't until recently that efforts have been initiated to propose and adopt a global standard on characterization and testing of VIP. One of the issues regarding VIP is its durability and aging due to pressure and moisture dependent increase of the initial low thermal conductivity with time; more so in building applications. In this paper, the aging of commercially available VIP was investigated experimentally; thermal conductivity was tested in accordance with ISO 8302 standard (guarded hot box method) and long-term durability was estimated based on a non-linear pressure-humidity dependent equation based on study of IEA/ECBCS Annex 39, with the aim of assessing durability of VIP for use in buildings. The center-of-panel thermal conductivity after 25 years based on initial 90% fractile with a confidence level of 90 % for the thermal conductivity (${\lambda}90/90$) ranged from 0.00726-0.00814 (W/m K) for silica core VIP. Significant differences between manufacturer-provided data and measurements of thermal conductivity and internal pressure were observed.

• Journal of the Korea Academia-Industrial cooperation Society
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• v.11 no.5
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• pp.1735-1740
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• 2010

The propellant KM10, a single propellant manufactured nitrocellulose, is known to cause natural degradation phenomena at long term storage. The self-life was estimated using generally used high temperature acceleration aging tests to analyze the content of stabilizer and using the Arrhenius equation & Berthelot equation to calculate reaction rate constants. According to the result of this study, self-life of propellant KM10 using the Arrhenius equation & Berthelot equation appear significantly different as 43.73, 16.53years and when compared with the paper of E. R. Bixon, self-life of propellant KM10 predicted using the Arrhenius equation was reasonably determined.

• Proceedings of the Korea Concrete Institute Conference
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• 2008.11a
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• pp.105-108
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• 2008

For the early seismic isolation design in Korea, foreign products of isolation bearings were used. But these days, the application of domestic products of isolation bearings is increasing. However various experimental studies can be found very seldom on the extreme and lonr term behaviors of isolation bearings. In this study, we considered the laminated rubber type isolation bearings that have many application cases in Korea and we evaluated their shear strength, long term characteristics such as aging and creep affecting shear strength of bearings in long term period. For the reality of experiments, fabricated isolation bearing specimens are designed for a real structure and shear loading was applied under design compressive loads. To evaluated aging effect, the specimens were exposed to high temperature environment for certain period and their shear properties were measured to compare with their original values. Also we measured creep amount of isolation bearings under constant compressive load for 1,000 hours and estimated creep amount after 60 years compatible with general life cycle of bridges.

• Proceedings of the Korean Society of Propulsion Engineers Conference
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• 2017.05a
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• pp.513-516
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• 2017

When stored for long periods in a powder-based device (PMD), the explosive power in the device is aged and the explosive power is changed. Thus, The gunpowder used in the PMD must be chemically and physically stable for both internal and external factors. Since $BKNO_3$ and THPP are used as representative gunpowder, thermodynamic and kinetic analyzes were performed based on these gunpowders. Differential scanning calorimeter (DSC) was used to analyze the calorific value and reaction rate. As a result, there was no significant change in caloric value and reaction rate in THPP. In addition, XPS and TEM-EDS analyzes were performed to confirm the formation of oxide films directly related to aging, and no oxide films were observed as a result of thermal analysis. In addition, XPS and TEM-EDS analyzes were performed to confirm the formation of oxide films directly related to aging. As a results, no oxide films were observed. It can be concluded that THPP is the most famous gunpowder in terms of long-term stability.