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백서 두개골에서 이종골 이식 후 치유에 관한 실험적 연구
조용석,김경원,Cho, Yong-Seok,Kim, Kyoung-Won 대한악안면성형재건외과학회 1999 Maxillofacial Plastic Reconstructive Surgery Vol.21 No.1
The purpose of this investigation was to evaluate the acceptability of the collagen-based xenograft ($Laddec^{(R)}$). Full thickness bone defects were prepared in the calvaria of the rats. In the experimental groups the bone defects were filled with a kind of collagen based xenograft. And bone defects, which left without filling, were used as control groups. Sequential sacrifice was performed at the 1st, 2nd, 4th, 8th, and 16th weeks of experiment. 1. At the 1st week of experiment, infiltration of chronic inflammatory cell was observed in all groups. In the experimental group, resorption of the xenograft was initiated. 2. At the 2nd week of experiment, infiltration of chronic inflammatory cells was decreased in all groups. In the experimental group, active resorption of xenograft and new bone formation from the periphery of the xenograft was observed. 3. At the 4th and 8th weeks of experiment, more resorption of the xenograft and new bone formation with calcification was observed in the experimental group. 4. At the 16th week of experiment, small bone trabecula was formed partially in the control group but that couldn't fill the whole bone defect. In the experimental group, more advanced resorption of xenograft and more new bone formation was observed. However mid portion of the xenograft was still remained without resorption. 5. From this experiment, we concluded that the collagen-based xenograft had some osteoconductive but no osteoinductive property. So the xenograft would be used for the bone defect filling material where rapid bone remodeling is not required.
조용석(Cho, Yong-Seok),홍진근(Hong Jin Keun),한군희(Han Kun-Hee) 한국산학기술학회 2008 한국산학기술학회 학술대회 Vol.- No.-
최근 RFID 기술의 발달과 편의성으로 인하여 RFID 활용 시스템의 사용이 증가하고 있다. 본 논문에 서는 RFID와 더불어 전 세계적으로 많은 사용자를 확보하고 있는 Web과의 연동을 통하여 시스템 구 축 비용의 감소와 사용 편의성의 증대 그리고 활용의 확장성을 목표로 하였다.
배기가스 온도 및 조성 변화에 따른 CDPF의 재생 특성에 관한 실험적 연구
조용석(Yong-Seok Cho),이정섭(Jung-Sub Lee),윤여빈(Yu-Bin Yoon),박영준(Young-Joon Park),이성욱(Seang-Wock Lee) 대한기계학회 2008 大韓機械學會論文集B Vol.32 No.8
The catalyzed diesel particulate filter (CDPF) is widely used for collecting soot from the exhaust gas of diesel engine. However, the CDPF need being regenerated after the soot accumulation. It is important to know characteristics of regeneration for CDPF with variation of exhaust gas temperature and composition. This study presents characteristics of regeneration according to variable exhaust gas composition. Furthermore, the experiment were performed variable gas temperature of CDPF inlet gas at each exhaust gas composition. Test-rig is used to control at each in let gas temperature and composition during regeneration of CDPF. Reaction intensity(Ic) is used to compare with each result. Experimental results indicated that increased concentration of NOx and O₂ lead to regenerate more greatly. Also, higher temperature of exhaust gas leads to make CDPF cleaner.