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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(Seong Jong Choi) 한국방송·미디어공학회 2011 한국방송공학회 학술발표대회 논문집 Vol.2011 No.7
재난이 발생하였거나 발생할 우려가 있을 경우 국민들에게 이에 대한 정보를 신속하게 제공하면 많은 인명 및 재산 피해를 줄일 수 있을 것이다. 본 고에서는 이러한 대국민 재난정보전달시스템의 모델을 제시한다. 본론에서는 이 모델을 구성하고 있는 요소들의 기능 및 이슈에 대해 기술한다. 본 고에서 제안한 모델은 현재 사용하고 있는 재난정보전달시스템의 특징을 분석하거나, 앞으로 개발할 재난정보전달시스템을 설계할 경우 참조모델로 활용할 수 있다. 또한 국가 재난정보전달시스템을 통합하기 위한 기본 모델로도 활용할 수 있을 것이다.
최성종(Sungjong Choi),최태규(Jongsung Kim),김종성(Taegyu Choi),권종완(Jongwan Kwon) 한국자동차공학회 2007 한국자동차공학회 지부 학술대회 논문집 Vol.- No.-
Fretting damage can be observed in automobile and railway vehicle, fossil and nuclear power plant, aircraft etc. In the present study, railway axle material RSA 1 used for evaluation of fretting fatigue life. Plain and fretting fatigue tests were carried out using rotary bending fatigue tester with proving ring and bridge type contact pad. Through these test, the following results are obtained: 1) it is found that the fretting fatigue limit of standard specimen decreased about 37% compared to the plain fatigue limit. 2) The early crack of Shinkansen type specimens initiated in contact area and final fractured below σamp=289 MPa. 3) The early crack of all TGV type specimens initiated in rounded area and fractured. 4) The wear debris is observed on the contact surface, and oblique cracks at an earlier stage are initiated in contact area. These results can be used as useful data in a structural integrity evaluation of railway axle.
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.
최성종(Sungjong Choi),김종성(Jongsung Kim),최태규(Taegyu Choi) 한국자동차공학회 2007 한국자동차공학회 지부 학술대회 논문집 Vol.- No.-
Fretting damage can be observed in automobile and railway vehicle, fossil and nuclear power plant, aircraft etc. In the present study, railway axle material RSA1 used for evaluation of fretting fatigue life. Plain and fretting fatigue tests were carried out using rotary bending fatigue tester with proving ring and bridge type contact pad. Through these test, the following results are obtained: 1) it is found that the fretting fatigue limit of standard specimen decreased about 37% compared to the plain fatigue limit. 2) The early crack of Shinkansen type specimens initiated in contact area and final fractured below σamp=214 ㎫. 3) The early crack of all TGV type specimens initiated in rounded area and fractured. 4) Tire tracks and rubbed scars were observed in the oblique crack region and fatigue crack growth region of fracture surface. 5) The wear debris is observed on the contact surface, and oblique cracks at an earlier stage are initiated in contact area. These results can be used as useful data in a structural integrity evaluation of railway axle.
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.
최성종(Choi Seong Jong),전인찬(Jeon Inchan),정현철(Jung Hyunchul) 한국방송·미디어공학회 2010 한국방송공학회 학술발표대회 논문집 Vol.2010 No.7
재난 상황에서 국민의 생명과 재산을 보호하기 위해서는 재난 관련 정보를 빠르고 정확하게 전달할 수 있는 시스템이 필요하다. 지상파 DMB는 개인용, 휴대용, 이동형, 디지털 멀티미디어, 방송 매체라는 특징을 가지는 재난경보를 전달하는 데 매우 적합한 매체로서, 이를 위해 지상파 디지털멀티미디어방송(DMB) 재난경보방송 표준이 2006년에 제정되었다. 현재 지상파 DMB를 통한 재난경보방송 송출은 기술적으로는 준비가 완료되었으나, 이를 지원하는 단말기는 출시되어있지 않다. 본 논문에서는 지상파 DMB 재난경보방송 수신기의 재난 메시지 처리과정 중 재난 정보 알림 단계를 분석하였다. 본 논문의 내용은 지상파 DMB 재난경보방송 수신기를 개발하는 데 활용할 수 있을 것이다.