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신동준,배대경,권창혁,신능철 대한슬관절학회 2000 대한슬관절학회지 Vol.12 No.1
Purpose : To analyze the clinical and radiological results after revision total knee arthroplasty(TKA) using structural allograft for severe bone defect. Materials and Methods: Between l992 and 1997, we used structural allograft for revision TKA in 20 knees of 18 patients with severe bone defect, The average age at surgery was of 61.6 years. The follow-up period averaged 43 months(range, 13-80 months). All patients had severe bone defect of the femur and/or tibia. Ten distal femur and thirteen proximal tibia required allografting. Fresh frozen femoral heads were used in all patients. We used posterior stabilized stemmed PFC knee component in all cases except one case with constrained condylar type. Patients were evaluated with physical examination, radiographs and the Hospital for Special Surgery knee rating scale. Results: Average range of motion before surgery was 87° and after surgery 107°. Average knee score was 65 before and 90.4 after surgery. Preoperative alignment averaged 1.8° valgus, ranging from varus to 13° valgus, and postoperative alignment averaged 7.2° velgus, ranging from 3° valgus to 10 valgus, All patient improved pain and stability. Postoperatively average HSS score improved from 65(ranging from 46 to 92) to 90.4(ranging from 75 to 100). All of the allografts united with host bone. There was no radiolucent line, lysis, fracture and infection. Conclusion : Structural allograft can be a satisfactory method of managing large bone defects in the failed total knee arthroplasty.
OCDMA 시스템을 위한 새로운 2차원 광 직교부호의 설계 및 분석
신동준,박영춘,최진우 에스케이텔레콤 (주) 2006 Telecommunications Review Vol.16 No.3
광 부호 분할 다중접속방식 (OCDMA) 시스템의 용량을 결정하는 중요한 요소 중의 하나인 광 직교부호(OOC)는 좋은 성질의 자기상관관계와 상호상관관계를 가진 이진 수열이다. 본 논문에서는 조합론을 이용하여 자기상관관계 값이 0이고 상호상관관계 값이 1인 새로운 2차원 광 직교부호인 SNPR 부호를 설계 및 분석하고 부호 크기에 대한 상한값을 유도한다. 또한 SNPR 부호는 OCDMA 시스템에 적합한 부호로서 유연성이 있고 생성이 용이하며 상관기 구조를 간단히 하는 장점을 가지고 있음을 보인다.