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성승훈,조민수,김익용,박광호,김대성 대한대장항문학회 2006 Annals of Coloproctolgy Vol.22 No.2
A primary malignant fibrous histiocytoma (MFH) is a soft tissue sarcoma of mesenchymal origin. A primary MFH occurs most commonly in the extremities and the trunk in adults, but rarely in the alimentary tract. We report a case of MFH of the mesoappendix in a 49-year-old male who presented with a periappendiceal abscess. To the best of our knowledge, this is the first report of MFH in the large intestinal tract, including the appendix, in Korea. The patient recovered well after a right hemicolectomy and was given adjuvant chemotherapy.
D/B기반 외부폭발에 의해 기둥에 작용하는 폭압이력 예측 모델
성승훈,차정민 한국전산구조공학회 2022 한국전산구조공학회논문집 Vol.35 No.4
A prediction model is proposed for a blast load acting on a column component because of an external explosion. The model can predict the pressure–time histories acting on a column using the fitting curves established from a database composed of finite-element (FE) analysis results. To this end, 70 numerical simulations using the commercial software AUTODYN were performed by changing the column width. To confirm the performance of the proposed model, pressure-time histories estimated from an existing empirical formula and the proposed model were compared based on the FE analysis results. It was verified that the proposed model can more precisely predict the pressure–time histories compared with the existing model. 본 연구에서는 유한요소해석 D/B를 기반으로 보간식을 산출하여 개활지 폭발현상에 의해 기둥에 작용하는 폭압이력을 예측하는 모델을 개발했다. D/B 구성을 위해 7종류 기둥 너비에 대해 총 70회의 유한요소해석을 수행했다. 제안하는 방법의 성능확인을 위해, 기존에 제시된 경험식 기반의 예측식과의 비교연구를 수행했다. 또한, D/B를 구성하는 point 외의 영역에서의 예측 정확도 확인을 위해 유한요소해석 결과와의 비교/검증 연구를 추가로 수행했다. 제안하는 방법은 기존의 경험식 기반 예측식에 비해 유한요소해석 결과와 유사한 결과를 산출함을 확인했다.
지중파에 의한 지하 구조물의 부재피해평가를 위한 고속해석모델 적용 가능성 연구
성승훈,정진웅,Sung, Seung-Hun,Chong, Jin-Wung 한국군사과학기술학회 2018 한국군사과학기술학회지 Vol.21 No.3
This study investigated applicability of the fast running model for damage assessment of underground structures by ground shock. For this reason, the fast running model that consists of two main models such as the ground shock generation and propagation model and the underground structural damage assessment model was developed. The ground shock generation and propagation model was programed using theoretical formula and empirical formula introduced in TM5-855-1(US army manual). The single degree of freedom model of structural components was utilized to predict structural dynamic displacements which are used as index to assess damage level of components. In order to confirm the feasibility of the developed fast running model, underground structural dynamic displacements estimated from the fast running model were compared to displacements obtained from the finite element analysis.
Damage Detection in High-Rise Buildings Using Damage-Induced Rotations
성승훈,정호연,이정훈,정형조 한국비파괴검사학회 2014 한국비파괴검사학회지 Vol.34 No.6
In this paper, a new damage-detection method based on structural vibration is proposed. The essence of the proposed method is the detection of abrupt changes in rotation. Damage-induced rotation (DIR), which is determined from the modal flexibility of the structure, initially occurs only at a specific damaged location. Therefore, damage can be localized by evaluating abrupt changes in rotation. We conducted numerical simulations of two damage scenarios using a 10-story cantilever-type building model. Measurement noise was also considered in the simulation. We compared the sensitivity of the proposed method to localize damage to that of two conventional modal-flexibility-based damage-detection methods, i.e., uniform load surface (ULS) and ULS curvature. The proposed method was able to localize damage in both damage scenarios for cantilever structures, but the conventional methods could not.
토양 내 J-hook 궤적을 고려한 침투해석 모델 개발
성승훈,지훈 한국전산구조공학회 2022 한국전산구조공학회논문집 Vol.35 No.1
This study proposes a penetration model in soil considering the wake separation and reattachment based on the integrated force law (IFL). Rigid body dynamics, the IFL, and semi-empirical resistance function about soil are utilized to formulate the motion of the hard projectile. Themodel can predict the trajectory in soil considering the spherical cavity expansion phenomenon under various oblique angles and angles ofattack (AOA). The Mohr-Coulomb yield model is utilized as the resistance function of the soil. To confirm the feasibility of the proposedmodel, a comparative study is conducted with experimental results described in the open literature. From the comparative study, thepenetration depth estimated from the proposed model had about 13.4% error compared to that of the experimental results. In general, the finiteelement method is widely used to predict the trajectory in soil for a projectile. However, it takes considerable time to construct thecomputational model for the projectile and perform the numerical simulation. The proposed model only needs to the dimension of theprojectile and can predict the trajectory of the projectile in a few seconds. 본 연구에서는 토양-탄체 간 분리 및 재접촉을 고려한 IFL 기반 침투해석 기술을 개발하고 이를 기존 문헌의 실험결과와 비교하는연구를 수행했다. 탄체를 강체로 가정한 후, 토양 내로 침투 시 발생하는 구형공동팽창 현상을 고려함으로써 탄체의 궤적을 예측할 수있다. 토양에 대한 저항함수는 Mohr-Coulomb 항복 모델을 활용했으며, 입사각 혹은 AOA에 따른 J-hook 현상을 모사할 수 있다. 기존문헌에서의 실험결과(총 6회)와의 비교 결과, 수치해석으로부터 예측한 탄체의 침투 깊이는 실험대비 약 13.4%의 평균오차를 나타냈다. 일반적으로 탄체의 침투 경로를 예측하기 위해 유한요소법이 널리 활용된다. 하지만, 유한요소법 활용 시, 탄체의 모델링을 위해많은 시간과 노력이 필요하며, 해석 수행을 위해 수 시간이 소요된다. 본 연구를 통해 개발한 모델을 활용할 시, 탄체의 치수 입력만 필요하며 해석 시간도 수 초 이내이다.