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탄소강 배관 재료의 DSA 거동에 미치는 노치 영향 평가
이사용(Sa Yong Lee),김진원(Jin Weon Kim),김홍덕(Hong Deok Kim) 대한기계학회 2012 大韓機械學會論文集A Vol.36 No.3
본 연구에서는 탄소강 배관 재료의 동적변형시효 거동에 미치는 노치에 의한 응력과 변형 집중효과를 파악하기 위해서, 표준 시편과 노치 시편을 이용하여 다양한 온도와 시험 속도에서 인장시험을 수행하였다. 또한, 시편의 형상에 따른 응력과 변형률 상태의 차이를 파악하기 위해서, 각 시편에 대한 유한요소 시뮬레이션을 수행하였다. 노치 시편을 이용한 인장시험 결과에서도 표준 시편에서 관찰된 것과 같은 동적변형시효의 증거인 serration과 인장강도의 증가 현상이 관찰되었다. 동일한 시험 속도에서 인장시험이 수행된 경우에 표준 시편에 비해 노치 시편에서 동적변형시효 현상이 고온에서 나타났다. 유한요소 해석 결과에 의하면 표준 시편에 비해 노치 시편에서 동적변형시효가 고온에서 나타나는 것은 노치부에서 응력과 변형의 집중으로 인한 높은 변형률 속도에 기인하는 것으로 확인되었다. In this study, tensile tests were performed using standard and notched-bar specimens under two different displacement rates and various temperatures, in order to investigate the effects of the stress and strain concentration at the notched section on the dynamic strain aging (DSA) behavior of carbon steel piping material. In addition, finite element simulations were conducted to evaluate quantitatively the stress and strain states for both types of specimen under uniaxial tensile loading. The results showed that serration and an increase in tensile strength, which are considered to be evidence of DSA in carbon steels, can be observed from tensile tests for notched-bar specimens. It was also found that the temperature region of DSA observed in the notched-bar specimens was higher than the DSA region observed in the standard tensile specimens tested under the same displacement rate. The results of finite element analysis showed that this behavior is associated with the high strain rate at the notched section, which is caused by the stress and strain concentration.
좁은 치조골에서 사다리꼴형 디자인으로 개발된 단폭경임플란트의 증례 보고
이사야(Sa Ya Lee),고미선(Mi-Seon Goh),고석영(Seok-Yeong Ko),윤정호(Jeong-Ho Yun) 대한치과의사협회 2018 대한치과의사협회지 Vol.56 No.5
Long-term survival and prognosis of narrow-diameter implants have been reported to be adequate to consider them a safe method for treating a deficient alveolar ridge. The objective of this study was to perform case report of narrow-diameter implants with a trapezoid-shape in anterior teeth alveolar bone. A 50-year-old male patient presented with discomfort due to mobility of all of the maxillary teeth and mandibular incisors. Due to destruction of alveolar bone, four anterior mandibular teeth were extracted. Soft tissue healing was allowed for approximately 3 months after the extraction, and a new design of implant placement was planned for the mandibular incisor area, followed by clinical and radiological evaluation. Implant placement was determined using an R2GATE surgical stent. The stability of the implants was assessed by ISQ measurements at the first and second implant surgery and after prosthetic placement. At 1 and 3 months and 1 year after implantation of the prosthesis, clinical and radiological examinations were performed. Another 50-year-old male patient presented with discomfort due to mobility of the mandibular central incisors. For the same reason as in the first patient, implant placement was carried out in the same way after extraction. ISQ measurements and clinical and radiological examinations were performed as in the previous case. In these two clinical cases, 12 months of follow-up revealed that the implant remained stable without inflammation or additional bone loss, and there was no discomfort to the patient. In conclusion, computer-guided implant surgery was used to place an implant in an optimal position considering the upper prosthesis. A new design of a narrow-diameter implant with a trapezoid-shape into anterior mandibular alveolar bone is a less invasive treatment method and is based on the contour of the deficient alveolar ridge. Through all of these procedures, we were able to reduce the number of traumas during surgery, reduce the operation time and total treatment period, and provide patients with more comfortable treatment.
이사야(Sa-Ya Lee) 연세대학교 신과대학(연합신학대학원) 2010 신학논단 Vol.60 No.-
??Abraham is presented as a symbolic image of faith who followed the commandment of God obediently in the entire Bible not only in the Old Testament. His resolute obedience raises him up to the forefather of faith to all Muslims and Christians not only to Jews, But it is true that Abraham had many traces of unfaith and disobedience together.<br/> ??There are four altar-building stories which Abraham had built in Genesis. It is worthy of notice that obedience and disobedience appear side by side around them, The first two stories appear as the parts of Abraham's journeys to the land of Canaan and each of last two stories appears as the completion of his jorneys after the seperation of Lot from Abraham and as the occurrence of Aqedah itself. Among the four altar-building stories of Abraham, The narrator delineates Abraham's dis-obedience against the commandment of God(Gen, 12:1-8; 12:9-13:4) through the first two stories, and his resolute obedience to the commandment which requests the severance of Abraham's paste(=Lot, Gen, 13:5-8) and the future(=Isaac, Gen. 22), And especially impf ???(Gen, 13:14), active part, ???(Gen, 13:15) and impf ????(Gen, 22:14) show that Abraham is turning from disobedient man to obedient one in the light of the com-manrment of Gen. 12:1-3.<br/> ??Although Abraham is individual person, the narrator presents him theologically as the representative of the (post) exilic community, In God's words that God will make Abraham to be a great nation, the narrator taught the descendants of Abraham to be obedient to the commandments of God because he attributed the disaster of the community to the disobedience to God. So he was looking forward the conversion of the community's circumstance through Abraham's change from disobedient unfaith to obedient faith. ??Abraham is presented as a symbolic image of faith who followed the commandment of God obediently in the entire Bible not only in the Old Testament. His resolute obedience raises him up to the forefather of faith to all Muslims and Christians not only to Jews, But it is true that Abraham had many traces of unfaith and disobedience together.<br/> ??There are four altar-building stories which Abraham had built in Genesis. It is worthy of notice that obedience and disobedience appear side by side around them, The first two stories appear as the parts of Abraham's journeys to the land of Canaan and each of last two stories appears as the completion of his jorneys after the seperation of Lot from Abraham and as the occurrence of Aqedah itself. Among the four altar-building stories of Abraham, The narrator delineates Abraham's dis-obedience against the commandment of God(Gen, 12:1-8; 12:9-13:4) through the first two stories, and his resolute obedience to the commandment which requests the severance of Abraham's paste(=Lot, Gen, 13:5-8) and the future(=Isaac, Gen. 22), And especially impf ???(Gen, 13:14), active part, ???(Gen, 13:15) and impf ????(Gen, 22:14) show that Abraham is turning from disobedient man to obedient one in the light of the com-manrment of Gen. 12:1-3.<br/> ??Although Abraham is individual person, the narrator presents him theologically as the representative of the (post) exilic community, In God's words that God will make Abraham to be a great nation, the narrator taught the descendants of Abraham to be obedient to the commandments of God because he attributed the disaster of the community to the disobedience to God. So he was looking forward the conversion of the community's circumstance through Abraham's change from disobedient unfaith to obedient faith.