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강대일 대한성형외과학회 2002 Archives of Plastic Surgery Vol.29 No.4
Scalp avulsion is rare injury that has serious consequences, including hospitalization, economic loss, devasting disfigurement, and psychological effects on the patient.Microvascular surgery now allows an initial chance for successful replantation and one-stage reconstruction. The need for secondary reconstructive procedures after a successful replantation is minimal. Our one year experience with 2 patients who suffered from avulsion of partial scalp is reviewed. Each patient got long hair entangled in the uncovered rotated machines and underwent replantation using microsurgical technique. Replantations have been accomplished using only arterio-venous and venous-venous anastomosis, without arterio-arterial anastomosis in 2 cases, because of unidentification of suitable arteries. The possible explanation for the success of the operation is the paucity of valves that exist in the venous network of the scalp and forehead. The final results were good. In the follow-up period, both experienced regrowth of hair in the scalp with light touch sensation.
여성형유방증 치료에 있어서 절제술 전 초음파 지방흡입술의 역할
강대일,박상우,최재훈,Kang, Dae-Il,Park, Sang-Woo,Choi, Jae-Hoon 대한성형외과학회 2010 Archives of Plastic Surgery Vol.37 No.6
Purpose: The method of using ultrasound-assisted liposuction and excision of the remaining glandular tissue is the preferred method for treating gynecomastia and is currently used worldwide. Herein, this article described the role of ultrasound-assisted liposuction before a surgical excision in the treatment of gynecomastia. The cosmetic results were objectively evaluated. Methods: 11 patients (22 breasts) underwent ultrasoundassisted liposuction and suction-assisted lipectomy between April 2007 and January 2009. At the end of the liposuction, the remaining glandular tissue was removed through the incision used for liposuction. We evaluated the cosmetic results using ordinary scale methods on the basis of four categories (recurrence, symmetry, contour irregularity, and scar). Results: The volume of aspirates ranged between 50 and 200 cc per breast and the average weight of tissue removed by excision was 65g per breast. No complications were recorded. Regarding the cosmetic evaluation, the recurrence, contour irregularity, and scar were excellent, the symmetry was good, and the overall results represented all those cases were mostly excellent. Conclusion: Ultrasound-assisted liposuction has many advantages in the treatment of gynecomastia. When excising the remaining glandular tissue, bleeding is decreased by the use of a tumescent technique. The glandular tissue is easily mobilized and excised after being "morselized" with ultrasound-assisted liposuction. The glandular tissue is simply dissected via the suction surface. Compared the residual mound of glandular tissue beneath the nipple and areola to the periphery, it facilitates precise control of the excision.
안와관골 복합체 골절에서 술전 평가로서 눈깜박반사 검사의 유용성
강대일,박상우,최재훈,Kang, Dae-Il,Park, Sang-Woo,Choi, Jae-Hoon 대한성형외과학회 2010 Archives of Plastic Surgery Vol.37 No.6
Purpose: As the evaluation of the preoperative sensibility in the orbitozygomatic complex fracture, used by most surgeons, depends on the patient's subjective judgements, it is difficult to make generalization and to use it as an objective evaluation method. We used the blink reflex study to objectively evaluate injury to the infraorbital nerve. Methods: From December 2008 to November 2009, a total of 16 patients underwent the patient's subjective report on sensory symptoms and the blink reflex study preoperatively. Among patients having orbitozygomatic complex fracture of type III or more according to Henderson's classification and simultaneously suspected as being injured along the infraorbital nerve pathway, patients who had difficulty in checking preoperative sensibility and said 'normal sensibility' were selected as candidates. Results: Fifteen patients showed abnormal R1 on the fracture side. These results suggested that most of patients had injury to the infraorbital nerve. Conclusion: Contrary to the existing tests, the blink reflex study is a useful diagnostic tool in reflecting injury to the infraorbital nerve objectively.
새로운 모수추정법을 사용한 구조형 기업부도확률모형간 예측성과
강대일 한국재무학회 2010 한국재무학회 학술대회 Vol.2010 No.08
본 연구는 새로운 모수추정법(2단계반복갱신법)을 적용하여 구조형 기업부도 확률모형간 예측성과를 국내주식시장 자료를 가지고 실증분석한다. 본 연구에서 채택한 기업부도확률모형은 Leland (2004)에서 비교한 모형들(Longstaff and Schwartz(1995), Leland and Toft(1996), Merton(1974))과 Down and Out 콜옵션모형 (Brockman and Turtle (2003))이다. 본 연구의 2단계반복갱신법은 기존 반복갱신 법으로 추정할 수 없었던 Leland and Toft 및 Down and Out 콜옵션모형의 장벽 모수를 일별로 추정한다. 본 연구는 모수추정에 전진귀납방식뿐 만아니라 후진 귀납방식을 도입하여 2단계반복갱신법, 기존 반복갱신법, 역사적변동성법, 연립 방정식법간 부도확률 예측성과를 비교한다. 단기 시계열 및 횡단면 부도예측성 과와 Cox 비례위험모형 분석 결과에서 후진귀납방식 2단계반복갱신법을 사용한 Down and Out 콜옵션 모형이 우수하고 통계적으로 유의하였다. 전․후진귀납방식 과 관계없이 각 모형에 맞는 2단계 및 기존 반복갱신법을 적용할 때 해당 모형 의 부도확률 예측성과가 다른 모수추정방식에 비하여 통계적으로 유의하였다.