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순동표면상에 있어서의 방사성 동위원소 Au198 및 Cu64 의 표면확산
최재열 대한금속재료학회(대한금속학회) 1964 대한금속·재료학회지 Vol.2 No.2
The surface diffusion coefficients (D_s) for Au^(198) on (100) and (111) surfaces of copper have been determined between 1050˚and 780℃ using a new analysis and experimental procedure. The results are ; (111) : D_s (Au)=2.1×10^5 exp (-51,100/RT) sq cm per sec. (100) : D_s (Au)=3.6×10^5 exp (-52,000/RT) sq cm per sec. D_s has also been determined for Cu^(64) at 870℃ and the values found are 4.5 times larger than these by the grain boundary grooving technique for the same surface orientations. This difference is felt to result from the approximate nature of the mathematical solution used in the present work. Attempts to measure D_s for silver on copper and silver surface indicated a means of matter transport different from surface diffusion was dominant in missing tracer from the source out over the surface. Calculations and experiment both indicate that this is the flow of silver through the vapor phase which completely masks the much smaller flow due to surface diffusion. The previous self-diffusion studies of D_s for silver and copper are discussed in terms of our own analysis and found to yield values of D_s factors of 10^5 or more greater than found by the grain boundary grooving technique.
무지 외반증의 치료에서 단일 나사못을 이용한 근위 중족골 쐐기 절골술
최재열,신헌규,장일성,강동호,Choi, Jae-Yeo,Shin, Hun-Kyu,Chang, Il-Sung,Kang, Dong-Ho 대한족부족관절학회 2005 대한족부족관절학회지 Vol.9 No.1
Purpose: We conducted this study to examine the clinical results of the proximal metatarsal wedge osteotomy using a single screw fixation and the distal soft tissue procedure in patients with moderate to severe hallux valgus deformity. Materials and Methods: Between February 2002 and February 2004, we performed these procedures on 12 patients (15 cases). The 6 cases of all patients had mild to moderate instability in the first MTC (metatarsocuneiform) joint. We estimated the clinical outcomes, the radiological findings and complications. Results: AOFAS score was improved from preoperative 41.5 points to 87.7 points lastly on average. The mean correction angle of HVA and IMA was $23.8^{\circ}$ and $6.6^{\circ}$, respectively. The mean position of tibial sesamoid was 2.67 before surgery and 0.87 after surgery. The mean shortening of the first metatarsal bone was 3.07 mm after surgery. There was no pain and complications on the first MTC joint except the breakage of screw in one case and instability of the first MTC joint was improved postoperatively. Conclusion: We obtained good clinical and radiographic outcomes in our series. So, proximal metatarsal wedge osteotomy using a single screw fixation and distal soft tissue procedure seems one of the good surgical treatments for moderate hallux valgus deformity.
근위 중족골 절골술과 변형 chevron 절골술을 이용한 무지 외반증의 수술적 치료의 비교
최재열,신헌규,김영훈,김홍균,이호진,Choi, Jae-Yeol,Shin, Hun-Kyu,Kim, Young-Hun,Kim, Hong-Kyun,Lee, Ho-Jin 대한족부족관절학회 2004 대한족부족관절학회지 Vol.8 No.1
Purpose: We compared the result of a proximal metatarsal closed wedge osteotomy and soft tissue procedure with a modified chevron osteotomy and soft tissue procedure in the treatment of hallux valgus. Materials and Methods: Between March 1999 and February 2003, we performed proximal metatarsal closed wedge osteotomy and soft tissue procedure on 17 feet (12 patients), and modified chevron osteotomy and soft tissue procedure on 12 feet (9 patients). Results: According to Mayo clinic forefoot scoring system (FFSS), group 1, with proximal metatarsal closed wedge osteotomy, shows 67.2 points postoperatively and group 2, with modified chevron osteotomy, shows 68.5 points postoperatively. In group 1, the average correction of hallux valgus angle and intermetatarsal angle was 20.8 degrees and 4.8 degrees, respectively. In group 2, the average correction of hallux valgus angle and intermetatarsal angle was 19.9 degrees and 4.7 degrees, respectively. The average shortening was 3.15 mm in group 1 and 1.38 mm in group 2. Conclusion: We obtained relatively good clinical and radiographic result in this study. The effect on shortening of the first metatarsal was greater in the proximal metatarsal closed wedge osteotomy than modified chevron osteotomy, but the metatarsal shortening did not related with metatarsalgia. So, both techniques seems optimal surgical treatment for hallux valgus deformity.