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백서 좌골신경의 동종이식후 조직반응에 관한 실험적 연구
정형배,임창준,이동근,김수남 원광대학교 치의학연구소 1990 圓光齒醫學 Vol.1 No.1
Nerve allografts as a bridge through which lost nerve can regenerate is useful in the repair of peripheral nerve defect resulting from trauma, and leprosy. But immunological rejection and complicated scar formation is an unavoidable problem in the application of allogenic nerves. This article is intended to study of the regeneration of allogenic nerve grafts in rats with histopathologically, scanning electron microscopically. 24 adult male Sprage-Dawley rats were used as the experimental animals. A 2㎝ skin incision was made on the lateral aspects of limb, parallel to femur. Segemnts of sciatic nerve trunk taken from rats, 10㎜ was resected at the middle of the thigh, nerve graft was inserted between the ends of gaps with perineural and epineural suture method with 10-0 prolene. Obsrevation was made simultaneous at 3 day, 1, 2, 3, 4, 6, 8 weeks after surgery. The results were as follows. 1. In light and electronic microscopic studies, marked degenerative change of the graft nerves were observed at 2 weeks after surgery. 2. After surgery, blood clot fromation was observed at 3 day, granualtion tissue formation was observed at 2 week & fibrous tissue proliferation was observed at 3 week. 3. In change of nerve fiber, there were wallerian degeneration at early stage, decrease in degeneration at 4 week and degeneration of myeline was continuded at 8 week. 4. At 4 week, schwann cells proliferate at its cut ends to join with the distal and proximal stump of the damaged nerve. 5. Fibrous scar tissues are formated at 2 weeks and increased progressively in 8 weeks, which was interrupted the regeneration of grafted nerve.
An interpolation method of b-spline surface for hull form design
정형배 대한조선학회 2010 International Journal of Naval Architecture and Oc Vol.2 No.4
This paper addresses the problem of B-spline surface interpolation of scattered points for a hull form design, which are not arbitrarily scattered, but can be arranged in a series of contours permitting variable number of points in the contours. A new approach that allows different parameter value for each point on the same contour has been adopted. The usefulness and quality of the interpolation has been demonstrated with some experimental results.
정형배,김재중,김찬석 국립7개대학공동논문집간행위원회 2004 공업기술연구 Vol.4 No.-
This paper suggests a method about how to get the NC code of intersection curve of rudder free form surface automatically. Suggested method uses NURBS interpolation and intersection in order to get the data of cutting lines and converts them in AutoLISP format to visualize in AutoCAD. This method has been tested by application in real rudder and shown the reliable results.
정형배 국립7개대학공동논문집간행위원회 2004 공업기술연구 Vol.4 No.-
This paper adresses the alternative challenge of hull form modeling fore-and after-body of ship based on NURBS interpolation and NURBS skinning. The presented applied experiments are used to illustrate effectiveness and usefulness of the proposed approach. As the results of experiments we propose approach for ship hull form design subject to advanced research. On the contrary to traditional lines modeling, surface modeling has a lot of advantages especially for producing production dada.
백서 좌골신경의 동종이식후 조직반응에 관한 실험적 연구
정형배,임창준,이동근,서재덕,Chung, Hyung-Bai,Yim, Chang-Joon,Lee, Dong-Keun,Se, Jae-Deok 대한악안면성형재건외과학회 1991 Maxillofacial Plastic Reconstructive Surgery Vol.13 No.2
Nerve allografts as a bridge of regeneration is useful in the repair of peripheral nerve defect resulting from trauma, and leprosy. But immunological rejection and complicated scar formation is an unavoidable problem in the application of allogeneic nerves. This article is intended to study of the regeneration of allogeneic nerve grafts in rats with histopathologically, scanning electron microscopically. 24 adult male Sprague-Dawley rats were used as the experimental animals. A 2cm skin incision was made on the lateral aspects of limb, parallel to femur. Segments of sciatic nerve trunk taken from rats, 10mm was resected at the middle of the thigh, nerve graft was inserted between the ends of gaps with perineural and epineural suture method with 10-0 prolene. Obsrevation was made simultaneously at 3 day, 1, 2, 3, 4, 5, 6, 8 weeks after surgery. The results were as follows. 1. In light and electronic microscopic studies, marked degenerative change of the graft nerves were observed at 2 weeks after surgery. 2. After surgery, blood clot fromation was observed at 3 day, granualtion tissue formation was observed at 2 week, and fibrous tissue proliferation was observed at 3 week. 3. In change of nerve fiber, there were Wallerian degeneration at early stage, decrease in degeneration at 4 week but degeneration of myeline was continuded at 8 week. 4. At 4 week, schwann cells proliferate at its cut ends to join with the distal and proximal stump of the damaged nerve. 5. Fibrous scar tissues are formed at 2 weeks and increased progressively in 8 weeks, which was interrupted the regeneration of grafted nerve.