• Journal of Trauma and Injury
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• 제34권1호
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• pp.61-65
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• 2021

A Morel-Lavallée lesion is a closed degloving injury caused by traumatic separation of the skin and subcutaneous tissue from the underlying fascia. However, since physicians tend to focus on treating the bone fracture, hemodynamic instability accompanying a Morel-Lavallée lesion can sometimes be overlooked. We report the case of a hemodynamically unstable 73-year-old man who had a Morel-Lavallée lesion of the thigh, but no femur fracture. Angiography showed active bleeding from the muscular branch of the right deep femoral artery, which was then successfully embolized.

• 한국원자력학회:학술대회논문집
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• 한국원자력학회 2005년도 춘계학술발표회
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• pp.461-462
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• 2005

• Journal of Korean Neurosurgical Society
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• 제58권2호
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• pp.147-149
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• 2015

A Schmorl's node is defined as a simple endplate intravertebral herniation resulting from trauma or idiopathic causes. Although Schmorl's nodes have been considered clinically insignificant, they might indicate an active symptomatic process or cause serious complications. In this study, we report an interesting case of complete separation of a vertebral body caused by an untreated Schmorl's node accompanying severe osteoporosis. To our knowledge, this is the first clinical report in the published literature to evaluate the complete separation of a vertebral body associated with a Schmorl's node.

• 한국자원리싸이클링학회:학술대회논문집
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• 한국자원리싸이클링학회 2005년도 춘계임시총회 및 제25회 학술발표대회
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• pp.109-112
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• 2005

The electrical pulse separation of concrete samples for the recycling purpose has been investigated by the electrical disintegration method using the discharged high voltageimpulse. First, when the consumed energy increased in electrical crushing, fracture section area increased clearly. This result suggests that crushing energy was consumed efficiently. Secondly, when conventional crushing after electrical disintegration is compared with only conventional crushing, gravels are more stable after electrical crushing. Thus, electrical crushing makes it easy to recover gravels from wasted concrete. In the next year, more efficient recovery of gravel for wasted concrete by electrical disintegration will be investigated. Thus, actual wasted concrete crushing by electrical separation and combination of conventional crushing will be carried out.

• Restorative Dentistry and Endodontics
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• 제25권3호
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• pp.371-380
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• 2000

The effect of fiber reinforcing materials on the fracture strength of composite resin was evaluated. Each ten composite resin bars reinforced by glassfiber[Fiber-Splint ML$^{(R)}$(Polydentia SA, Switzerland)], polyethylene fiber [Ribbond$^{(R)}$(Ribbond Inc., U.S.A.)] and polyaramid fiber[Kevlar$^{(R)}$(DuPont, U.S.A.)] were loaded under the 3-point compression technique. Another ten pure composite resin bars without reinforcement were used as a control group. Then mean fracture strength and standard deviation were calculated and a ANOVA and Scheffe test were used in statistics. The results were as follows: 1. Kevlar group showed the highest fracture strength as 175.5MPa (p<0.05). Fiber-Splint ML group showed the lowest fracture strength as 112.7MPa. 2. The mean value of fracture strength in Ribbond group was 136.4MPa, and that of unterated control group was 143.6MPa. No difference was found between the two groups. 3. Ribbond and Kevlar reinforcement groups showed a catastrophic failure, where complete separation of pieces occurs to a unseparated fracture pattern. The use of Kevlar reinforcement fibers with composite resin showed significant increase in the average load failure and the presence of the fibers did prevent the catastrophic crack propagation present in the unreinforced samples. The use of Ribbond reinforcement fibers with composite resin showed no significant increase in the average load failure. However, the presence of the fibers did prevent the catastrophic crack propagation. Because high strength of glassfiber are rapidly degraded on exposure to moisture and humidity. The use of Fiber-Splint ML reinforcement fibers with composite resin showed significant decrease in the average load failure and displayed catastrophic fractures.

• 한국산학기술학회논문지
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• 제7권3호
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• pp.265-270
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• 2006

복합재로 된 판재에 대하여 동적 균열이 접합면을 따라서 진행되어 가면서 찢어져 나갈 때 그 계면 주위에서의 응력 상태 및 변형, 견인응력 등을 조사하였다. 최대의 등가응력 및 소성 변형율은 접촉이 바로 떨어지는 부분에서 그리고 판 끝부분의 휘어지는 부근에서 최대의 변형량이 되었다. 견인력은 0.015mm정도로 그 면이 떨어졌을 때 최대치 75 MPa로서 되었다가 서서히 낮아지면서 0.13mm이상 떨어졌을 때는 0으로 일정하게 되었다. 이러한 연구 자료로서 정확한 파괴강도 해석과 안전설계 및 새로운 고급재료의 개발에 필요한 자료를 제공할 수 있는 기초적인 연구를 수행함이 본 연구의 목적이다.

• Geomechanics and Engineering
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• 제7권3호
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• pp.233-246
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• 2014

Estimation of fracture initiation pressure is one of the most difficult technical challenges in hydraulic fracturing treatment of vertical or horizontal oil wells. In this study, the influence of in-situ stresses and pore pressure values on fracture initiation pressure and its profile in vertical and horizontal oil wells in a normal stress regime have been investigated. Cohesive elements with traction-separation law (XFEM-based cohesive law) are used for simulating the fracturing process in a fluid-solid coupling finite element model. The maximum nominal stress criterion is selected for initiation of damage in the cohesive elements. The stress intensity factors are verified for both XFEM-based cohesive law and analytical solution to show the validation of the cohesive law in fracture modeling where the compared results are in a very good agreement with less than 1% error. The results showed that, generally by increasing the difference between the maximum and minimum horizontal stress, the fracture pressure and its profile has been strongly changed in the vertical wells. Also, it's been clearly observed that in a horizontal well drilled in the direction of minimum horizontal stress, the values of fracture pressure have been significantly affected by the difference between overburden pressure and maximum horizontal stress. Additionally, increasing pore pressure from under-pressure regime to over-pressure state has made a considerable fall on fracture pressure in both vertical and horizontal oil wells.

• 한국방사선학회논문지
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• 제7권2호
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• pp.107-112
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• 2013

발목 병변을 관찰하는 단순 방사선촬영은 여러 가지가 있다. 그 중에서 Ankle Broden법은 발꿈치뼈(Calcaneus) 및 발목뼈(Ankle Joint)의 결합상태와 발목뼈의 발꿈치뼈 골절(Calcaneus Fracture), Subtentaculum Tali Frature를 관찰하기 위하여 촬영을 한다. 이 촬영법은 전 후면과 측면뿐 아니라, 사면 상(oblique view)이나 축 상(axial view)의 촬영을 하며 잦은 부상이 발생하는 목말뼈 발꿈치뼈간, 발꿈치뼈 발배뼈간 결합상을 보기 위해 주로 촬영을 한다. 본 연구는 석고처치 환자들은 발목관절이 영상에 잘 묘출되기가 어렵기 때문에 발목뼈 사이의 관계 및 연부조직의 구조적 변화와 Subtalar joint, Calcaneus Fracture, Subtentaculum Tali Frature에 따른 목말뼈 발꿈치뼈의 골 결합 (talocalcaneal coalition)을 관찰하기 위한 Harris-Beath View($30^{\circ}{\sim}55^{\circ}$) 촬영 시 평가에 유용한 발목뼈의 결합상을 얻을 수 있는 각도를 알아보고자 하였다. 연구의 진행은 40명의 환자에게서 획득한 영상을 평가하였으며, 평가결과 $25^{\circ}$의 촬영상은 목말밑 관절(subtalar joint)이 열려져 분리되지 않았고 또한, Subtentaculum Tali Frature에 중복되어 보였다. $30^{\circ}$의 촬영상은 발꿈치뼈 골절(Calcaneus Fracture), Subtentaculum Tali Frature, 목말밑관절(subtalar joint과 후방 관절면의 앞부분이 가장 잘 나타나고 Calcaneo Navicularcoalition, Talocal Canealcoalition, Naviculo Cuneiform coalition의 결합상태가 명확하게 보였다. $35^{\circ}$의 촬영상은 목말밑관절(subtalar joimt), 목말뼈(talus), 발뒤꿈치뼈의 뒤쪽관절면이 명확하고 발목발꿈치관절(talocalcaneal joint)의 분리정도가 좋고 발목뼈굴(sinus tarsi)이 넓게 나타나며 좋은 평가가 되었다. $45^{\circ}$영역에서는 연부조직과 석고 분리를 판별할 수 있었고 가쪽복사와 뼈 밀도가 명확하게 보였다. $35^{\circ}$에 비해 발꿈치뼈(Calcaneus)이 분리되었지만 영상이 왜곡되어 보였다. Calcaneus, Subtentaculum Tali Frature는 $25^{\circ}$에서 $1.20{\pm}0.414$, $30^{\circ}$에서는 $2.47{\pm}0.516$, $35^{\circ}$에서는 $2.87{\pm}0.352$, $45^{\circ}$에서는 $2.27{\pm}0.458$로 나타났고 통계적으로 유의한 차이가 나타났다(p<0.05). 왜곡의 정도를 포함시키면 $30^{\circ}$영역의 왜곡이 적게 나타났고, $40^{\circ}$ 영역은 심한 왜곡현상을 보였다. 따라서 Ankle(Broden)촬영에서 $30{\sim}35^{\circ}$상이 가장 좋은 영상이었으며, $30{\sim}40^{\circ}$상에서는 Calcaneus Fracture, Subtentaculum Tali Frature의 진단에 가장 좋은 영상을 묘출하였다.

• 대한금속재료학회지
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• 제48권1호
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• pp.1-7
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• 2010

Experiments have demonstrated that the addition of a moderate amount of V to $Fe_{52}Co_{(20-x)}B_{20}Si_4Nb_4V_x$ amorphous alloy enhances the plasticity of the alloy. In particular, $Fe_{52}Co_{17.5}B_{20}Si_4Nb_4V_{2.5}$ alloy withstood a maximum of 8.3% strain prior to fracture along with a strength exceeding 4.7 GPa. Energy dispersive x-ray spectroscopy conducted on the $Fe_{52}Co_{17.5}B_{20}Si_4Nb_4V_{2.5}$ alloy exhibited evidence of compositional modulation, indicating that nm-scale phase separation had occurred at local regions. In this study, the role played by nm-scale phase separation on the plasticity was investigated in terms of structural disordering and shear localization in order to better understand the structural origin of the enhanced plasticity shown by the developed alloy.

• Clinics in Shoulder and Elbow
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• 제15권2호
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• pp.143-147
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• 2012

상부 견갑 현수 복합체(Superior shoulder suspensory complex)의 3중 붕괴는 몇몇 저자들에 의해서만 보고된 극히 드문 손상이다. 저자들은 오구돌기, 견갑극 골절 및 견봉-쇄골 관절의 탈구가 동반된 상부 견갑 현수 복합체의 3중 붕괴 환자를 경험하였기에 보고하고자 한다. 본 환자의 경우 견봉-상완 및 오구-상완 간격을 유지하기 위하여 관혈적 정복 및 내고정을 시행하여 상부 견갑 현수 복합체의 3중 붕괴 모두를 해부학적으로 복원하여 치료하였다. 술 후 6개월에 증상 없이 관절운동범위를 모두 회복하였다. 최종 추시인 5년에는 상부 견갑 현수 복합체의 기능이 완전히 회복된 것을 확인할 수 있었으며, 환자는 수술 결과에 대하여 크게 만족하였다.