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토끼의 이개와 비중격에서 채취한 연골모세포의 단층배양 조건에 대한 영향인자
진경석,박소영,김병국,최하나,정영훈,오정훈 대한이비인후과학회 2015 대한이비인후과학회지 두경부외과학 Vol.58 No.2
Background and Objectives In tissue engineering of the cartilage, cellular expansion is an essential step for creating useful amounts of tissue required. Many variables such as media composition, growth factors and cell seeding density have been utilized to stimulate the ability of cellular proliferation and to reduce the number of expansion in monolayer. The object of this study was to evaluate the effects of human serum (HS) and rabbit serum (RS) on cellular proliferation of auricular and nasal septal chondrocytes of the rabbit. Materials and Method Auricular and nasal septal chondrocytes of the New Zealand White Rabbit were expanded in monolayer in medium supplemented with 2% RS, 5% RS, 10% RS, or 10% HS with or without adding of growth factors. The effect of the supplements on the cellular proliferation was compared. Results The proliferation yield of chondrocytes grown in RS was comparable to that with HS. Both serums results in increased proliferation; however, the amount of cellular proliferation was not correlated with the concentration of the serum. The proliferation rate of nasal septal chondrocytes was higher than that of auricular chondrocytes. Conclusion Both HS and RS resulted in the increased proliferation of rabbit auricular and nasal septal chondrocytes. The results show that the determination of appropriate types and concentrations of serum is required for cell expansion in constructing tissue-engineered cartilage.
이동하중을 고려한 활하중 설계기준 연구 (60m 이하 교량)
진경석,한만엽,Jin, Kyung Seok,Han, Man Yop 대한토목학회 2013 대한토목학회논문집 Vol.33 No.4
현행 국내 1등교 활하중 설계기준은 DB-24하중과 DL-24하중을 적용하고 있다. 특히 45m 이상의 장경간 교량에서는 DB-24하중보다 DL-24 하중에 의한 전단력, 모멘트가 지배적인 것으로 나타나 대부분 DL-24하중을 적용하여 설계하고 있다. 그러나 실제 교량에서트럭하중은 한 점에 머무르며 작용하지 않고 교량 위를 종방향으로 이동하며 작용하므로, 이러한 이동 효과를 고려하여 이동트럭하중(ML-24)을 정의하여 DL-24하중과 비교한 결과, DL-24하중은 50m 경간을 기준으로 이동트럭 하중(ML-24)에 의한 전단력을 전 구간에서 만족시키지 못하였고, 모멘트의 경우도 일부구간에서 만족하지 못하는 것으로 나타났다. 이에 본 논문에서는 경간 50m를 기준으로 현재 DL-24하중을 구성하는 하중 인자를 조정하여 새로운 활하중 모델인 RL-24하중을 제시하였으며, 이를 경간 45~60m 단순교에 적용시켜 검토한 결과, 실제 작용 하중과 유사한 ML-24하중에 의해 교량에 작용하는 모멘트와 전단력을 모두 만족하였으며, 특히 문제점으로 발견되었던 부재 중앙과 부재 단부에서의 전단력 비율이 일정하게 유지되는 결과를 얻었다. 또한 국내의 활하중 모델들과의 비교를 통하여 RL-24하중 조정안의 적절성과 그 적용성을 검토하였다. 본 연구에서는 최근 연구개발과 실용화가 활발한 60m 경간급의 1등급 교량에 대하여 실제 트럭의 이동 효과를 고려하여 모멘트와 전단력에 대하여 합리적인 설계가 이루어질 수 있도록 새로운 설계기준을 제시하였다. The current domestic design criteria of live load employs DL-24 load and DB-24 load. Particularly for long span bridges above 45meters, DL-24 load is forced to apply and design them, since the shearing force and the moment of DL-24 load appears more dominate than those of DB-24. But it appeared that this DL-24 load didn't meet the vehicles traveling load, which affected bridges in real use. Hence this paper defined ML-24 load similar to the load applied to real bridges and also defined a new live load model, RL-24 load, after adjusting the existing DL-24 load, which doesn't meet the moment and the shearing force of ML-24. As the result of applying and reviewing RL-24 load to simple bridges of span of 45~60m, the results satisfying both the moment and the shearing force applied to bridges in real use by traveling load were attained. Besides, the applicability of it was examined in comparison with live load models of home and abroad.
Effect of Holes and Segmentation on the Structural Behavior of a Prestressed Concrete Girder
한만엽,진경석,Dong-Hak Chang,Tae-Heon Kang,전세진 대한토목학회 2014 KSCE JOURNAL OF CIVIL ENGINEERING Vol.18 No.6
The developed Holed, Incrementally Prestressed Concrete (H-IPC) girder represents various advanced design concepts. First, theentire self-weight can be considerably reduced by introducing holes in the web, with minimal effect on the moment of inertia. Also,prestress can be efficiently introduced in an incremental way by distributing the anchorages at the holes. The girder can maintain thesame sections throughout the span by preventing concentration of the anchorages. This can further reduce self-weight, fabricatingtime, and cost. Furthermore, the spliced girder system makes it possible to extend the span to more than the conventional length sincethe segments can be transported and prefabricated on site. The objective of this study is to verify the various advantages of theoriginal design concepts by examining the structural behavior obtained from the loading tests of the 50 m-long full-scale girderspecimens. The effect of the holes in the web on overall behavior is one of the main concerns in the test. The test results of asegmented specimen are also compared with those of a non-segmented specimen to investigate the effect of segmentation. It isdemonstrated that the segmental H-IPC girder can be effectively used for the design and construction of long-span girder bridges.
시력 저하를 동반한 비·부비동에 발생한 미만성 거대 B세포 림프종 1예
진상균,진경석,오정훈,김병국 대한이비인후과학회 2014 대한이비인후과학회지 두경부외과학 Vol.57 No.4
Malignant lymphoma of the sinonasal tract is relatively uncommon. In particular, B-cell lymphoma is hardly found in the Asian population although the NK/T-cell type of lymphoma is relatively commonly found. The authors experienced a case of diffuse large B-cell lymphoma originating from the ethmoid sinus, which caused the unexpected visual disturbance without nasal symptoms and/or systemic B symptoms, such as fever, night sweat, and weight loss. Diagnosis of B cell lymphoma is often delayed because it does not always show the specific symptoms of lymphoma. Therefore, starting with careful physical and imaging studies are always important while higly suspecting malignancy. Furthermore, early precise biopsy is of great important for precise diagnosis and proper management for the treatment of malignant lymphoma. Korean J Otorhinolaryngol-Head Neck Surg 2014;57(4):266-9