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CFRP 쉬트의 부분적 박락이 RC 보의 내하력에 미치는 영향
심원보,홍기남,연영모,정규산 한국복합신소재구조학회 2020 복합신소재구조학회논문집 Vol.11 No.2
본 논문은 CFRP 쉬트로 휨 보강된 철근콘크리트 보에서 보강재의 탈락이 구조물에 미치는 영향을 파악하기 위한 실험적 그리고 해석적 연구결과를 보고한다. 실험적 연구로 CFRP 시트의 비부착 수준 및 위치를 실험변수로 고려한 실험체들에 대한 휨파괴 실험이 수행되었다. 중앙부에 비부착구간을 갖는 실험체의 경우 비부착구간의 증가에도 불구하고 최대하중 및 강성의 변화는 크게 감소하지 않았다. 단부에 비부착 구간을 갖는 실험체의 경우 비부착 구간이 증가할수록 최대하중 및 강성이 크게 감소하였다. 이것은 보강재의 작은 보강길이로 인한 정착력의 부족으로 인해 철근의 항복 이후 보강재가 조기 박리되었기 때문으로 판단된다. 본 연구의 결과와 기존 제안된 부착강도 모델을 이용한 예측 결과의 비교를 통해 기존 부착강도 모델들은 단부 비부착 실험체들보다 중앙 비부착 실험체들의 내하력을 더 정확하게 예측하는 것으로 나타났다. This paper reports the experimental and analytical results to investigate the effect of carbon fiber reinforced polymer (CFRP) sheet delamination on the load capacity of reinforced concrete beams strengthened with CFRP sheets in flexure. As an experimental study, flexural failure tests were performed on specimens by considering the unbonded level and position of the CFRP sheet as experimental variables. For specimens with an unbonded section in the center, the maximum load and the stiffness did not decrease despite the increase in the unbonded section. However, for specimens with the unbonded section at the end, the maximum load and stiffness decreased significantly as the unbonded section increased. This could be because of the premature peeling of the CFRP sheet after the yielding of the rebar because of the lack of anchorage due to the small bond length of the CFRP sheet. The comparison between the results of this study and the prediction results using the existing proposed bond strength model showed that the existing bond strength models predicted the load capacity of the center unbonded specimens more accurately than the end unbonded specimens.
십이경근(十二經筋)과 근육(筋肉)과의 관계(關係)에 대한 연구
심원보,김용득,안영남,김경식,손인철,Sim Won-Bo,Kim Yong-Deuk,An Young-Nam,Kim Kyung-Sik,Sohn In-Chul 경락경혈학회 2003 Korean Journal of Acupuncture Vol.20 No.2
The Oriental Medicine is described with so many terms of its own theory causing misunderstand of the concept which is expressed with same term used in modern medicine. Muscular system is also used in the both medicines, the Oriental Medicine and modern medicine. For the purpose of resolving the misunderstand of using the medical terms, we referred to a large number of literature for the muscular system in both medicine. Although there are few references concerning about systematic components in the Oriental Medicine, among the concepts of the Oriental Medicine, there are comparatively many approaches to the Meridian muscular system, a muscular system related with the Meridian, Therefore, there are many similarities and differences in the interrelation between the muscular system which was stated at the time of the concept of the Meridian system was developed and anatomical muscular system in the modern medicine. As a result of survey the references, we found out that anatomical muscular system is limited to visual compartments, whereas the Meridian muscular system is covering not only visual components but also the relation with internal organs. We conclude that there are conceptual differences in the kyung-keun system in the past and anatomical muscular system in the present.
골유착 치과 임플란트를 이용한 상악 무치악부 치료의 예후에 관한 임상적 평가
심원보,이동근,최규환,Shim, Won-Bo,Lee, Dong-Keun,Choi, Kyu-Hwan 대한악안면성형재건외과학회 1999 Maxillofacial Plastic Reconstructive Surgery Vol.21 No.2
The use of osseointegrated implant has been reported that is an acceptable procedure for the restoration of totally or partially edentulous patient and that offers good predictability of long term success. It is difficult to get high success rate in edentulous maxillae with inadequate bony quality and quantity, and anatomic limitations such as pneumatic maxillary sinus and nasal floor. The various trials such as sinus lifting, bone grafting, guided bone regeneration, trabecular condensation with osteotome, and the use of wide-diameter implant have been introduced to solve these problems. This study was undertaken to assess the evaluation of clinical prognosis of the implant restorations with these various implantation techniques in the maxillary edentulous area. One hundred eight patients were treated with a total of 386 endosseous implants from March 1994 to January 1998 at Dept. of Dentistry, Korea Veterans Hospital in Seoul Korea. The various techniques for implantation in the edentulous maxillae were supplied to overcome the limitations of implant fixation. These techniques consist of sinus lifting, guided bone regeneration, onlay bone grafting, and osteotome trabecular condensation technique. The total success rate of implant restoration of this study was 93% in the maxillae. The success rate of implant restorations with conventional technique was 94.6%, with osteotome trabecular condensation technique was 94.1%, with guided bone regeneration technique was 93.3%, with bone grafting technique was 92.9%, with sinus lifting technique was 83.8%. The success rate on the maxillary anterior area was 95.2% and that on the posterior area was 91.9%. The failures were associated not only with surgical installation techniques but also bony quality and quantity, characteristics of implant, and stress distribution when in function.