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도재 냉각방법의 차이가 금속-도재간 열팽창 양상과 결합력에 미치는 영향
임애란,임호남,박남수,Lim, Ae-Ran,Lim, Ho-Nam,Park, Nam-Soo 대한치과보철학회 1990 대한치과보철학회지 Vol.28 No.1
Although a number of studies have been performed to assure that residual stress caused by a mismatch of alloy porcelain thermal expansion can contribute to clinical failure of a ceramometal restoration, the interactive influence of cooling rate on the magnitude of thermal expansion difference and on bond strength between them have not been extensively analyzed. The objective of this study was to determine the influence of cooling rate and the number of firing cycles on the expansion mismatch and the flexural failure resistance of metal porcelain strip. Tested alloys included one Pd-Ag alloy, one Ni-Cr-Be alloy with two kinds of porcelain, Vita and Ceramco. Metal specimens were cast into rods with a height of 13mm and a diameter of 5mm. Subsequently, the castings were subjected to scheduled firing cycles without porcelain. And the porcelain specimens after being fired were trimmed into a bar with a final dimension of $5{\times}5{\times}25mm$. Thermal expansions of the alloys and porcelains were measured by using a push rod or a differential dialometer respecitvely. Porcelain glass transition temperatures and expansion values were derived alloy-porcelain pairs were assessed by comparing expansion values of the components at a porcelain glass transition temperature. Calculations were made using combinations of a Ni-Cr alloy or Pd-Ag alloy with each of two porcelain products. Metal-porcelain strip specimens were subjected to four point loading in an Instron testing machine until crack occured at the metal-cramic interface at the time of sharp decrease of load on recorder. On the basis of this study, the following conclusions may be stated: 1. Regardless of the kinds of ceramometal combinations, both of calculated and experimental data revealed that the double fired specimens exhibited a significantly lower flexural strength. 2. By the rise of the amount of mismatch, bond strength were decreased. 3. Thermal expansion value of Pd-Ag alloys were higher than that of Ni-Cr alloys. 4. Expansion curves of metal were proportional to the increase of temperature and were not affected by the experimental conditions, however porcelains did not show the same magnitude of metal, and a shift of the glass transition temperature to higher temperatures was observed when cooled rapidly 5. Alloy-porcelain thermal compatibility appeared more dependent on the porcelain than the alloy.
도재 냉각방법의 차이가 금속-도재간 열팽창 양상과 결합력에 미치는 영향
임애란,임호남,박남수,Lim, Ae-Ran,Lim, Ho-Nam,Park, Nam-Soo 대한치과보철학회 1991 대한치과보철학회지 Vol.29 No.1
Although a number of studies have been performed to assure that residual stress caused by a mismatch of alloy porcelain thermal expansion can contribute to clinical failure of a ceramometal restoratoin, the interactive influence of cooling rate on the magnitude of thermal expansion difference and on bond strength between them have not been extensively analyzed. The objective of this study was to determine the influence of cooling rate and the number of firing cycles on the expansion mismatch and the flexural failure resistance of metal porcelain strip. Tested alloys included one Pd-Ag alloy, one Ni-Cr-Be alloy with two kinds of porcelain, Vita and Ceramco. Metal specimens were cast into rods with a height of 13mm and a diameter of 5mm. Subsequently, the castings were subjected to scheduled firing cycles without porcelain. And the porcelain specimens after being fired were trimmed into a bar with a final dimension of 5 x 5 x 25mm. Thermal expansions of the alloys and porcelains were measured by using a push rod or a differential dialometer respectively. Porcelain glass transition temperatures and expansion values were derived alloy- porcelain pairs were assessed by comparing expansion values of the components at a porcelain glass transition temperature. Calculations were made using combinations of a Ni-Cr alloy or Pd-Ag alloy with each of two porcelain products. Metal- porcelain strip specimens were subjected to four point loading in an Instron testing machine until crack occured at the metal-cramic interface at the time of sharp decrease of load on recorder. On the basis of this study, the following conclusions may be stated : 1. Regardless of the kinds of ceramometal combinations, both of calculated and experimental data revealed that the double fired specimens exhibited a significantly lower flexural strength. 2. By the rise of the amount of mismatch, bond strength were decreased. 3. Thermal expansion value of Pd-Ag alloys were higher than of Ni-Cr alloys. 4. Expansion curves of metal were proportional to the increase of temperature and were not affected by the experimental conditions, however porcelains did not show the same magnitude of metal, and a shift of the glass transition temperature to higher temperatures was observed when cooled rapidly. 5. Alloy- porcelain thermal compatibility appeared more dependent on the porcelain than the alloy.
Temperature Dependence of ²³Na NMR in a NaMnCl₃ Single Crystal
임애란(Ae Ran Lim),김지은(Ji Eun Kim),한태종(Tae Jong Han) 한국자기학회 1995 韓國磁氣學會誌 Vol.5 No.3
The temperature dependence of ²³Na nuclear magnetic resonance in a NaMnCI₃ single crystal grown by the Czochralski method has been investigated by employing a Bruker FT NMR spectrometer operating at 4.7 T. The quadrupole coupling constant of ²³Na in NaMnCI₃ increases as the temperature increases. The temperature dependence of e²qQ / h may be fitted with a linear equation of the form e²qQ / h = 155 + 0.117 (T-Tr) ㎑ for the temperature range of 140-380 K.
정보의 신뢰성 제공을 위한 Static RSS 구현 방안
신승중 ( Seung-jung Shin ),임애란 ( Ae-ran Lim ),곽계달 ( Kae-dal Kwack ) 한국정보처리학회 2008 한국정보처리학회 학술대회논문집 Vol.15 No.1
RSS는 Web2.0의 키워드중 하나인 공유를 위해 정보를 빠르고 쉽게 배포하기 위한 시스템이다. 그러나 현재 RSS주소는 정보제공자에 의해 빈번하게 바뀐다. 이때문에 서비스의 에러가 발생하게 되어 정보의 신뢰성이 떨어지게 된다. 따라서, Static RSS의 구현을 통해 이문제를 해결 하고자 한다. Static RSS는 고정적인 RSS Code를 이용하여 빈번히 변경되는 RSS 주소를 관리 할 수 있다. RSS 주소가 변경 되더라도 RSS 코드는 고정되기 때문에 서비스 에러가 발생 하지 않는다. 이로 인해 정보를 영속성을 유지 시키고 정보의 신뢰성을 제공 할 수 있다.