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무지 외반증의 수술 중 시행하는 내측 관절낭 봉합술의 방법에 대한 고찰
최성종,김병철,은일수,허정욱,Choi, Sung-Jong,Kim, Byung-Cheol,Eun, Il-Soo,Huh, Jung-Wook 대한족부족관절학회 2008 대한족부족관절학회지 Vol.12 No.1
Purpose: Medial capsulorrhaphy is additional hallux reduction method following various hallux reduction procedures and we are going to report author's opinion about several methods of medial capsulorrhaphy. Materials and Methods: We performed three kinds of medial capsulotomy and imbricatory capsulorrhaphy in hallux valgus surgery. Through 8 cadavar study, we compared the easiness of sesamoid reduction and hallux valgus angle reduction. Also, we measured thickness of capsule in various portions. Results: Longitudinal capsule incision and imbrication was useful in sesamoid reduction and vertical procedures was useful in hallux valgus angle reduction. The capsule thickness was measured thickest in dorsal and distal portioin. Conclusion: The methods of medial capsulorrhaphy should be planned preoperatively considering individual hallux deformities. These selected medial capsulorrhaphy can help the reduction of hallux valgus deformity correction and its maintenance.
최성종(Sung Jong Choi),김병철(Byung Cheol Kim),류총일(Chong Il Yoo),최현수(Hyeon Soo Choi) 대한정형외과학회 2006 대한정형외과학회지 Vol.41 No.2
천추 신경초 낭종(sacral perineural cyst)은 척수 경막 내 신경근의 지주막(arachnoid membrane)으로 구성된 낭종으로서 Tarlov 등에 의해 최초로 보고되었다. 저자들은 요통 및 하지 방사통을 호소하였던 환자에게서 시행한 자기 공명 영상에서 천추 신경초 낭종을 우연히 발견하여 광범위 후방 감압술 및 낭종 절제술을 시행하였다. 추시 관찰상 임상증상이 호전되었기에 문헌 고찰과 함께 보고하는 바이다. A sacral perineural cyst is composed of an arachnoid membrane of the nerve root at the sacral region. We performed a wide posterior decompression and cystectomy in a patient who suffered from back pain with pain radiating in both lower extremities, and whose MRI findings coincided with those of a sacral perineural cyst. Clinical improvement was observed during the follow-up review. We report the surgical treatment with a review of the relevant literature.
최성종(Sung-Jong CHOI),권재도(Jae-Do KWON),Hitoshi ISHII 대한기계학회 2001 대한기계학회 춘추학술대회 Vol.2001 No.3
Atomic Force Microscope (AFM) was used to study cross sectional profiles and dimensions of fatigue striations in 2017- T351 aluminum alloy. Their widths (SW) and heights (SH, SH<SUB>h</SUB>, SH₁) were measured from the cross sectional profiles of three-dimension AFM images. The following results that will be helpful to understand the fatigue crack growth mechanism were obtained. (1) The relation of SH= a (SW)<SUP>1.2</SUP> was obtained. (2) The ratio of the striation height to its width SH/SW, SH<SUB>h</SUB>/SW and SH/SW did not depend on the stress intensity factor range △ K and the stress ratio R( =P<SUB>min</SUB>/P<SUB>max</SUB> = K<SUB>min</SUB>/K<SUB>max</SUB>). (4) Effect of precipitate on the morphology of striation was changed by the relative dimensional difference between the striation width SW and the precipitates. From these results, the applicability of the AFM to nano-fractography is discussed.
알루미늄 합금 적층물 마찰교반처리(FSP)의 실험적 연구
최성종(Sung-Jong Choi),김호찬(Ho-Chan Kim) 대한기계학회 2021 대한기계학회 춘추학술대회 Vol.2021 No.11
Friction stir welding is a technique mainly used for joining dissimilar materials. Recently, as a study on its application, its use as a means for surface modification and defect removal of metal castings is being considered. This field is called friction stir treatment (FSP). In this study, defects such as pores formed on the surface and inside of the aluminum alloy DED laminate were locally removed and the possibility of FSP application as a means of surface modification was explored.
최성종(Sung-jong Choi),권재도(Jae-do Kwon),배용탁(Yong-tak Bae) 한국자동차공학회 2003 한국자동차공학회 지부 학술대회 논문집 Vol.- No.-
Fretting is a kind of surface degradation mechanism observed in mechanical components and structures. The frettingdamage decreases in 50-70 % of the plain fatigue strength. In the present study, the degraded 1Cr-0.5Mo steel used for long period time at high temperature (about 515 oC) and artificially reheat-treated materials are prepared. These materials are used for evaluating an effect of thermal aging on the fretting fatigue behavior. Through the experiment, it is found that the fretting fatigue endurance limit of the reheat-treated 1Cr-0.5Mo steel decreased about<br/> 46 % from the non-fretting fatigue endurance limit, while the fretting fatigue endurance limit of the degraded 1Cr-0.5Mo steel decreased about 53 % from the non-fretting fatigue endurance limit. The maximum value of fatigue endurance limit difference is observed as 57 %(244 MPa) between the fretting fatigue of degraded material and non-fretting fatigue of reheat-treated material.
내열 금형강 DED 금속적층재의 조직, 결함 및 기계적 물성 평가
최성종(Sung-Jong Choi),김호찬(Ho-Chan Kim) 한국기계가공학회 2022 한국기계가공학회지 Vol.21 No.3
Directed energy deposition (DED) was adopted as a metal additive manufacturing method to develop a mold for the hot stamping process. The test piece was machined from Heatvar laminate material, and results were obtained through microstructure and defect observations, as well as hardness, tensile strength, and joint strength tests. 1) Spherical pores and irregular-shaped cavities were observed as lamination defects, and columnar dendrites formed in the structure, which tended to become coarse upon heat treatment. 2) The hardness of the heat-treated material (480HV) was slightly lower than that of the non-heat-treated material (500HV). 3) In the tensile test, the maximum tensile stress and strain of the heat-treated material were 1392 MPa and 15%, respectively, which were slightly higher than the values of 1381 MPa and 13%, respectively, for the non-heat-treated material. 4) In the case of the early final fracture in the tensile test, in most cases, pores or irregularly shaped cavities were observed at the fracture surface or near the surface. 5) In the joint strength test, most of the specimens finally fractured in the laminated metal area, and the fracture surface was intragranular. In addition, dimples formed over the entire area on the fracture surface of the fractured specimen after sufficient elongation.