• 대한족부족관절학회지
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• 제9권2호
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• pp.167-172
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• 2005

Purpose: We report our results of arthroscopic treatment of symptomatic avulsion fracture of the malleolus in chronic ankle pain, and also analyzed the clinical and radiological features for evaluating the good candidate for arthroscopic treatment. Materials and Methods: Fourteen patients who were diagnosed with intra-articular avulsion fractures of the malleolus received arthroscopic surgery and were followed up for at least a year. The clinical and radiological characters including MRI and arthroscopic findings were reviewed. Clinical assessments were done according to the AOFAS score system. Results: There was a history of inversion type of the injury in most cases and local tenderness of lesion site was a unique. MRI study showed thickened anterior talofibular ligament (ATFL) in 8 cases (57%) and discontinued ATFL in 3 cases (21%). Enhanced signal surrounding soft tissue corresponding to synovial inflammation and impingement was found in 12 cases (86%). Preoperative score of all patients were $74.0{\pm}5.5$, which improved to $89.3{\pm}6.7$ at the follow-up after the treatment (P<0.001). Conclusion: Most patients had history of injury and localized tenderness in the area coinciding with radiological findings. Thickened ATFL and contrast enhancement around the ossicle were frequently found. Symptomatic avulsion fractures of the malleolus associated with the clinical and radiological findings above could be a good candidate for arthroscopic treatment.

• 비파괴검사학회지
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• 제22권4호
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• pp.386-392
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• 2002

골다공골증은 해면골의 골소주 두께 감소 및 파단에 기인한 전체적인 골질이 저하되는 질병이다. 골다공증의 진단은 X-ray 및 초음파를 이용하는 방법이 있다. 그러나 X-ray 방법은 인체에 해로우며 단지 골밀도만을 평가한다. 대부분 골다공증 진단 초음파 시스템은 heel뼈를 통과하는 초음파 속도 및 감쇠 파라미터를 측정하고 있다. 한편, 기존의 초음파 시스템들은 heel뼈의 한 점에서만 측정을 실행하므로 측정 위치에 따른 오차로 인하여 골다공증의 진단 예측성이 매우 낮다. 본 연구에서는 두 개의 초음파 탐촉자를 이용하여 선형 스캐닝 방식에 의한 heel뼈 전체 영역에 대한 초음파 파라미터 값들은 2차원 영상처리기법을 통하여 골다공증을 진단하는 기법을 수행하였다.

• Archives of Reconstructive Microsurgery
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• 제16권1호
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• pp.48-51
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• 2007

There could be several methods for trochanteric reconstruction including local flap, pedicled perforator flaps, free flap, etc. We performed greater trochanteric reconstruction with lumbar artery perforator free flap in some aberrant method. So we report this experience with review of literatures. A 42-year-old man visited our hospital with a large soft tissue defect in his left greater trochanteric area by traffic accident. The patient had wide skin and soft tissue defect combined with open femur fracture. During one month period of admission, he underwent femur open reduction and wound debridement four times. After that we planned thoracodorsal perforator free flap reconstruction. The flap was outlined as large as $20{\times}15\;cm$ and elevated in a suprafascial plane from the lateral border. During intramuscular perforator dissection, we found that two 1.5 mm diametered perforator vessels coursed inferomedially toward second lumbar region. Finally the flap became lumbar artery perforator flap based on second lumbar artery perforator as a main pedicle. After flap transfer, the perforator vessels were connected with inferior gluteal artery and vein microsurgically. The operation was successful without uneventful course. We found no significant postoperative complication and donor site morbidity during six months follow up periods. Lumbar artery perforator flap could be an alternative procedure for thoracodorsal perforator flap in some patients with anatomic variant features.

• Archives of Reconstructive Microsurgery
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• 제2권1호
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• pp.20-28
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• 1993

From 1981 to 1991, twenty one vascularized bone grafts had been performed for the treatment of large bone defects of the extremities, with average follow-up of 65.4 months. Fibulae were used in 15 patients Including two cases of osteocutaneous flap, iliums in 5 including two of osteocutaneous flap, and osteocutneous rib in one. Ten of these patients were treated for segmental defects derived from trauma or infection sequelae of long bones, while eight for locally aggressive benign or malignant bone tumors ; and three for congenital pseudarthrosis of tibia. The location of the lesions were 8 cases in tibia; 7 in humerus ; 3 in forearm bone ; 2 in foot ; and 1 in femur. The length of bone defects were averaged as 10 cm, ranging from 3 to 17.5. In eighteen patients(85.7%), the operation was successful. The duration from operation to bony union was average 5.1 months on successful cases, and three of them needed additional procedures, such as bone graft and electrical stimulation to promote bony union. Local recurrence was found in one case of chondrosarcoma, resulting in AK amputation. Wound infections were noted each one case on donor or recipient site. In five cases, the fracture of grafted bone, which united with cast immobilization in four, occurred average 16.7 months after operation.

• Archives of Reconstructive Microsurgery
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• 제2권1호
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• pp.29-41
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• 1993

고려대학교 의과대학 정형외과학 교실에서 광범위한 연부조직결손을 동반한 감염된 경골결손 34례에 대하여 생비골 및 생피부편이식을 시행하고 얻은 결과는 다음과 같다. 1. 국소염증이 완전히 조절되지 않은 상태에서도 생비골 및 생피부편 이식이 가능하였다. 2. 생비골 및 생피부편 이식술을 동시에 시행함으로써, 생피부편의 임상상태로 생비골 이식의 성공여부를 간접적으로 알 수 있었다. 3. 추시기간동안 이식된 비골은 비후되었으며, 이식골의 흡수는 없었다. 4. 경골을 부분절제한 경우에는 이식비골의 골절은 발생되지 않았다. 5. 이식된 비골의 비후는 수술부위의 국소염증 상태에 영향을 받는 것으로 사료되었다.

• 한국철도학회논문집
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• 제13권2호
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• pp.179-185
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• 2010

장대레일 좌굴과 파단에 대한 안정성을 확보하고 효율적인 유지관리를 위해서는 레일온도의 특징을 파악하는 것이 매우 중요하다. 최근 들어, 기후변화에 의해 여름철 최고 대기온도는 상승하고 겨울철 최저 대기온도는 점점 하강하고 있다. 이러한 현상은 연간 레일온도의 변화량에 영향을 미치게 되고 설정온도와 관리온도의 변화를 일으킬 수 있다. 본 연구에서는 기후 및 온도 측정시스템을 구축하여 기후요소를 포함한 레일온도를 실측하였다. 실측자료의 심층적인 분석을 통하여, 기존 레일온도 추정식은 특정한 조건(기후요소들의 특정 조합) 에서만 적용이 가능함을 알 수 있었다. 현장의 실제 기후요소를 고려한 레일온도를 확률론적 접근으로 예측하는 것이 더욱 합리적일 것이다.

• 한국해양공학회지
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• 제4권1호
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• pp.88-100
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• 1990

Among the test methods to evaluate stress-corrosion cracking(SCC) on the basis of fracture mechanics, constant displacement(bolt) loading method using modified-WOL specimen is practically convenient. In this test method, compliance formula is generally required to calculate load(consequently $K_{ISCC}$). There are many problems in using the analytic compliance formula to calculate $K_{ISCC}$, so we had proposed the experimental $K_{ISCC}$ evaluation technique in the previous report. This study has employed the slightly altered configuration of modified-WOL specimen made of weldable structural stee(BS360-50D). With these specimens, stress-corrosion tests have been performed in $H_2S$ gas saturated 20% HCl solution. Through the test, the problems as mentioned earlier have been discussed again, and the proposed evaluation technique has been verified. And the stress-corrosion cracks and hydrogen blisters have been investigated in the initiation step with the aids of metallurgical micrographs, SEM fractographs, and EPMA analysis. The inclusions segregated in the mid-thickness region traps hydrogen to produce the hydrogen blistering. The applied or residual stress does not contribute the occurrence of the blister. Hydrogen absorbed into the mid-thickness region is consumed to produce the blistering so that stress-corrosion crack could hardly be detected at that region. The stress-corrosion cracks initiate from the inclusions and propagate in radial pattern. And the initiation site is remote from the crack tip and is inclined from the crack plane, which is assumed to be caused by the triaxial stress and the amount of the absorbed hydrogen.

• Archives of Plastic Surgery
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• 제33권6호
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• pp.688-694
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• 2006

Purpose: Reconstruction of the craniofacial defects can be carried out with autogenous tissues, allogenic implants, or alloplastic materials. Titanium mesh systems have been used for bony reconstruction in non load-bearing areas. They offer several advantages: immediate availibility without any donor site morbidity, easy handling, stable 3-D reconstruction, and low susceptibility to infection. The aim of this study is to evaluate the usefulness and complications of titanium mesh system in the reconstruction of the craniofacial defects. Methods: From Jan. 2000, to Dec. 2004, we performed reconstruction of craniofacial bone defects in 21 patients who had benign or malignant tumor and fracture events in the cranium, orbit, nasal bone, maxilla, zygoma and the mandible. The size of the defects ranged from $1.0{\times}1.5cm$ to $12{\times}10cm$. Two different mesh systems, micro-titanium augmentation mesh and dynamic mesh was used for bony reconstruction in non load-bearing areas. The patients were evaluated from 1 to 4 yrs clinically and radiographically with a mean follow up period of 1.5 yrs. Results: There were no serious complications, including wound infection, foreign body reaction, exposures or loos of the mesh, central infection and pathologic findings of bone around mesh exception of one patient, who had expired of skull base tumor recurrence. Long-term stability of the reconstructions and the overall functional and aesthetic outcome was excellent. Conclusion: Our experiences demonstrate that the Titanium mesh system is a relatively safe and efficient method in the craniofacial reconstruction and have broadens our choices of therapeutic procedures in the craniomaxillofacial surgery.

• 대한안전경영과학회지
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• 제18권1호
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• pp.9-15
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• 2016

In this study, the current regulations to be adequate in industrial site have to be renew in order to prevent the fatal injuries by mobile cranes. Fatal injury analyses were conducted with several accident cases by the mobile cranes. For each accident, the causes of the injuries were examined and proper safety measures were proposed. This study proposed a revision of the standard guideline as an accident prevention measures through in-depth analysis of fatal accidents. First, fatality rate per 10,000 persons by the mobiles cranes was 0.57 in 2011. Second, the in-depth analysis of the mobile crane accidents showed that the main factors of the accidents were the overturn of mobile crane, the fracture of connection part between mobile crane boom and rope, the breaking of rope and the misunderstanding over the signal between a mobile crane driver and workers around a mobile crane. Third, the order of high defection of connecting parts was bucket bolt, bracket and extension parts. Fourth, since there were several cases of overturn of mobile crane by itself in the in-depth analysis of the mobile crane, the over slop-proof device was proposed as the main alternative in this study. Fifth, the revision of standards of safety factor that shall be more than 10, of connecting parts of mobile crane was proposed.

• Composites Research
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• 제26권5호
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• pp.328-333
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• 2013

본 연구에서는 유리섬유/폴리프로필렌 복합재료 고정판을 인조골에 체결하여 실제 골절치료 시술 상황을 모사하였으며, 고정판의 적합성을 판단하기 위하여 수분 흡수율, 스크류의 체결 상태, 하중 조건의 변화에 따른 피로 실험을 진행하였다. 실험 결과 0~12주 동안 수분 흡수가 이루어진 모든 시편에서 기대 수명인 65만 사이클을 넘는 100만 사이클 이상의 피로 수명을 가짐을 확인하였다. 스크류 체결 상태는 골절부의 변형률 차이에 주목할만한 영향을 미치지 못하였다. 본 논문에서는 유리섬유/폴리프로필렌 복합재료 고정판을 다양한 환경조건 하에서 압축-압축 피로실험을 수행하여 기계적 우수성을 입증하였으며, 이 결과는 향후 금속 고정판을 복합재료 고정판으로 대체하기 위한 관련 연구에 유용한 정보를 제공할 것으로 기대된다.