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쇄골 원위부 골절에 사용된 K-강선의 척추관 내로의 이동
이병일(Byung-Ill Lee),김용범(Yong-Beom Kim),최형석(Hyung-Suk Choi),김창현(Chang-Hyun Kim),지정우(Jung-Woo Ji) 대한정형외과학회 2013 대한정형외과학회지 Vol.48 No.3
저자들은 쇄골 원위부 골절에 사용된 K-강선의 경추부 척추관 내로의 이동을 경험하였다. 39세 남자 환자가 우측 쇄골 원위부 골절로 10년 전 타 병원에서 수술적 치료를 시행 받았으며, 내원 후 시행한 단순 방사선 사진상 우측 쇄골 원위부 3개의 K-강선 중 하나가 파단되어 있었고, 파단된 K-강선이 경추부 척추관 내로 이동한 것이 관찰되었다. 다행히 신경학적 증상을 야기하지는 않으나 척수 손상 등의 치명적인 합병증의 발생 가능성이 있었던 경우로, K-강선을 이용한 수술이 불가피할 경우 K-강선 제거 전까지 적극적인 방사선학적 추시 관찰이 필요하며, 충분한 고정기간 후에는 K-강선을 제거해야 할 것으로 생각한다. We report on migration of the K-wire, which is used in fixation of a distal clavicular fracture, to the spinal canal. A 39-year-old male was admitted to our hospital with pain in his right shoulder. He had undergone surgery for a right distal clavicular fracture (in another hospital) ten years ago. Plain radiographs showed an old right distal clavicle fracture fixed with three K-wires. One of the three K-wires had broken, and the broken K-wire had migrated to the spinal canal. Fortunately, the patient exhibited no neurological symptoms, however, there was a possibility of fatal complications, such as spinal cord injury. Therefore, we recommend close follow-up for patients who undergo repair of a distal clavicular fracture is fixed using a K-wire, with use of x-ray until the K-wire has been removed.
자유표면 유동해석을 위한 WMLS 기반 입자법 기술 개발
남정우(Jung-Woo Nam),박종천(Jong-Chun Park),박지인(Ji-In Park),황성철(Sung-Chul Hwang),허재경(Jae-Kyung Heo),정세민(Se-Min Jeong) 한국해양공학회 2014 韓國海洋工學會誌 Vol.28 No.2
In general, particle simulation methods such as the MPS(Moving Particle Simulation) or SPH(Smoothed Particle Hydrodynamics) methods have some serious drawbacks for pressure solution. The pressure field shows spurious high fluctuations both temporally and spatially. It is well known that pressure fluctuation primarily occurs because of the numerical approximation of the partial differential operators. The MPS and SPH methods employ a pre-defined kernel function in the approximation of the gradient and Laplacian operators. Because this kernel function is constructed artificially, an accurate solution cannot be guaranteed, especially when the distribution of particles is irregular. In this paper, we propose a particle simulation method based on the moving least-square technique for solving the partial differential operators using a Taylor-series expansion. The developed method was applied to the hydro-static pressure and dam-broken problems to validate it
지진해일 중 해안안벽 주변의 부유체 거동에 관한 입자법 시뮬레이션
박지인(Ji-In Park),황성철(Sung-Chul Hwang),남정우(Jung-Woo Nam),정세민(Se-min Jeong),박종천(Jong-Chun Park) 대한조선학회 2012 대한조선학회 학술대회자료집 Vol.2012 No.5
Tsunamis are ocean waves generated by movements of earth's crust. Several geophysical events can lead to this kind of catastrophe: earthquakes, landslides, volcano eruptions and other mechanisms such as underwater explosions. Most of the damage associated with tsunamis is related to their wave run-up at the shoreline. Therefore, well prediction of maximum wave run-up is an important aspect of any seismic sea wave mitigation effort. In this study, the numerical simulations of the behaviors of a floating body near quaywall during Tunami are investigated by using a particle method. First, the wave run-up with solitary waves are validated though the comparison with experiments and theoretical formulation. Then the behaviors of a floating body with different draft are investigate numerically.
지진해일 중 해안안벽 주변의 부유체 거동에 관한 입자법 시뮬레이션
박지인(Ji-In Park),황성철(Sung-Chul Hwang),남정우(Jung-Woo Nam),정세민(Se-min Jeong),박종천(Jong-Chun Park) 한국해양환경·에너지학회 2012 한국해양환경공학회 학술대회논문집 Vol.2012 No.5
Tsunamis are ocean waves generated by movements of earth"s crust Several geophysical events can lead to Ms kind of catastrophe: earthquakes, landslides, volcano eruptions and other mechanisms such as underwater explosions. Most of the damage associated with tsunamis is related to their wave run-up at the shoreline. Therefore, well prediction of maximum wave run-up is an important aspect of any seismic sea wave mitigation effort. In this study, the numerical simulations of the behaviors of a floating body near quaywall during Tunami are investigated by using a particle method. First, the wave run-up with solitary waves are validated though the comparison with experiments and theoretical formulation. Then the behaviors of a floating body with different draft are investigate numerically.
파랑 중 오일붐 성능 예측을 위한 2차원 입자법 시뮬레이션
남정우(Jung-Woo Nam),박지인(Ji-In Park),황성철(Sung-Chul Hwang),박종천(Jong-Chun Park),정세민(Se-Min Jeong) 한국해양공학회 2013 韓國海洋工學會誌 Vol.27 No.4
Oil booms are one of the most widely used types of equipment for the protection of coastal areas against oil spills. In some situations, however, there are several types of oil leaks from the oil boom. Important factors regarding these phenomena include the surrounding ocean environment, such as waves, the density and viscosity of oil, the length of the oil boom skirt, etc. To estimate the performance of the oil boom, it is necessary to predict the behavior of the spilled oil and oil boom. In the present study, the prediction of oil boom performance in waves was carried out using the Pusan?National?University?modified Moving Particle Semi?implicit (PNU?MPS) method, which is an improved version of the original MPS proposed by Koshizuka and Oka (1996). The governing equations, which consist of continuity and Navier?Stokes equations, are solved by Lagrangian moving particles, and all terms expressed by differential operators in the governing equations are replaced by the particle interaction models based on a kernel function. The simulation results were validated through a comparison with the results of Violeau et al. (2007).