• 콘크리트학회지
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• 제24권4호
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• pp.48-52
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• 2012

• 한국건설관리학회:학술대회논문집
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• 한국건설관리학회 2007년도 정기학술발표대회 논문집
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• pp.364-367
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• 2007

도심지에서 수행하는 공사가 확대되면서 소음, 진동 등을 최소화하는 공법으로, 지하연속벽 공법이 제안되어 많은 활용이 이뤄지고 있다. 지하연속벽 공법은 기존 공법에 비해 대심도 굴착이 가능하며, 소음과 진동이 적어 활용도가 높음에도 불구하고 굴착 작업 간 수직도 확보를 위해 많은 시간이 소요된다. 공법의 적용이 이뤄지고 있는 현장방문 결과 건설기계를 통해 작업이 진행됨에도 불구하고 장비를 조작하는 조작자의 경험과 직관에 더 높은 의존도를 갖고 있는 것이 큰 문제로 조사되었다. 본 연구는 지하연속벽 공법의 주요 장비인 트렌치커터 운전기사 및 관련된 기술자들과의 인터뷰를 바탕으로 공법과 장비의 특성을 조사하고 Cost-oncern Matrix를 통해 굴착장비의 자동화 도입 타당성을 검토하였다. 연구를 통해 지하연속벽 공법에서 굴착 작업을 수행하는 트렌치커터를 자동화 하는 것이 타당한 것으로 판단된다.

• Journal of Trauma and Injury
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• 제20권1호
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• pp.47-51
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• 2007

Penetrating chest trauma caused by the components of one's own car is rare in motor vehicle accidents. We experienced two cases of penetrating chest injury caused by the sideview mirror of the patient's vehicle. One was a 25-year-old man. The sideview mirror penetrated the left chest, went through the diaphragm, and ruptured the spleen. He was in shock upon arrival at the emergency room. An emergency thoracotomy and laparotomy were done. The ruptured spleen was resected, the lung and the diaphragm were debrided and repaired, and the chest wall was reconstructed. The other patient was a 57-year-old male, who was transported to our emergency room with the sideview mirror of his truck stuck into his right chest wall as the result of an accident. He also had a right Bennet's fracture and an open fracture of the right tibia. Air had been sucked into the right pleural cavity through the wound. Multiple rib fractures and lung lacerations had also occurred. Removal of the sideview mirror, repair of the lacerated lung, and reconstruction of chest wall were done immediately. Both patients recovered without complication and were discharged.

• Journal of Chest Surgery
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• 제24권12호
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• pp.1238-1241
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• 1991

Agenesis of the hemidiaphragm is unusual congenital anomaly associated with a high mortality. A case of congenital agenesis of left diaphragm was experienced in 22-day old male patient who was dyspneic and cyanotic on admission. Emergency exploration through the left eight interspace thoracotomy showed complete agenesis of the left diaphragm. The stomach and transverse colon covered with peritoneal sac was partially herniated into left hemithorax. The left lung was slightly hypoplastic. This neonate had no intestinal malrotation. The defect was reconstructed using Dacron graft. Dacron patch was sutured with interrupted Ethibond to chest wall anteriorly, esophagus aorta and costomediastinal sinus medially, and the tenth rib posterolaterally. Postoperatively, Extubation was performed at 1st day, but some respiratory difficulty was noted. Severe dyspnea was occurred at postoperative 11th day and so reintubation was done. Intermittently ventilatory support and intravenous alimentation were continued for 9 days after that. Thereafter he had no respiratory problems at discharge.

• Journal of Chest Surgery
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• 제8권1호
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• pp.29-36
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• 1975

We have experienced 49 cases of tumors of chest wall at St. Mary`s Hospital from Jan. 1963 to Dec.1974. In four cases of them, the reconstruction of chest wall defects performed. 1] Out of 49 cases of tumors of the chest wall, 27 cases were benign tumors, 14 cases metastatic malignant tumors, and 8 cases primary malignant tumors. 2] Twenty-six cases [50%] of tumors of the chest wall were on the bony cage. Among them benign tumors were 9 cases [35%], metastatic malignant tumors 14 cases [53%], and primary malignant tumors 3 cases [12%]. Of these, 24 cases were located on the ribs and 2 cases on the sternum.3] The malignant tumors of bony chest wall were excised in en bloc resection including involved ribs. The wide defects of bony chest wall were reconstructed by means of displacement of neighboring ribs and mobilized diaphragm, in the two osteogenic sarcomas of rib, and of prosthesis with silastic sheets in one rhabdomyosarcoma and one metastatic adenocarcinoma of lung.

• Geomechanics and Engineering
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• 제14권4호
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• pp.315-324
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• 2018

With rapid economic growth, numerous deep excavation projects for high-rise buildings and subway transportation networks have been constructed in the past two decades. Deep excavations particularly in thick deposits of soft clay may cause excessive ground movements and thus result in potential damage to adjacent buildings and supporting utilities. Extensive plane strain finite element analyses considering small strain effect have been carried out to examine the wall deflections for excavations in soft clay deposits supported by diaphragm walls and bracings. The excavation geometrical parameters, soil strength and stiffness properties, soil unit weight, the strut stiffness and wall stiffness were varied to study the wall deflection behaviour. Based on these results, a multivariate adaptive regression splines model was developed for estimating the maximum wall deflection. Parametric analyses were also performed to investigate the influence of the various design variables on wall deflections.

• 한국전산구조공학회논문집
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• 제16권1호
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• pp.19-32
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• 2003

주상복합건물의 구조시스템은 휨변형에 의해 횡력에 저항하는 전단벽 구조와 전단변형에 의해 저항하는 라멘구조의 복합구조로 이루어져 있으며, 이 두 구조의 원활한 힘의 전달을 위하여 전이층에 주로 춤이 큰 보를 사용한다. 주상복합건물은 이러한 큰 질량과 강성을 갖는 전이층으로 인하여 유한요소법에 의한 해석 시 동적 해석을 수행하여야 하며, 일반적인 해석 절차로는 해결하기 어려운 많은 문제점을 야기한다. 일반적으로 주상복한건물의 해석시 전이층 바닥판은 강막을 적용하거나 판요소로 직접 입력하나 적절한 평가없이 사용되고 있다. 따라서 본 연구에서는 강막 적용에 따른 영향을 평가하여 올바른 해석 방법을 제시한다.

• Physical Therapy Rehabilitation Science
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• 제7권3호
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• pp.95-101
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• 2018

Objective: To determine if the provision of visual biofeedback using real-time rehabilitative ultrasound imaging (RUSI) enhances the acquisition and retention of diaphragm muscle recruitment during exercise. Design: Two group pretest posttest design. Methods: Thirty healthy subjects were randomly assigned to the verbal feedback group (VG, n=15) or the visual and verbal feedback group (VVG, n=15). The VG performed breathing exercises 10 times with verbal feedback, and the VVG also performed breathing exercises 10 times with verbal feedback and visual feedback with the use of RUSI to measure changes in diaphragm thickness (DT). For DT, the mid-axillary lines between ribs 8 and 9 on both sides were measured in standing, and then the chest wall was perpendicularly illuminated using a linear transducer with the patients in supine to observe the region between rib 8 and 9 and to obtain 2-dimensional images. DT was measured as the distance between the two parallel lines that appeared bright in the middle of the pleura and the peritoneum. After one week, three repetitions (follow-up session) were performed to confirm retention effects. Intra- and between- group percent changes in diaphragm muscle thickness were assessed. Results: In the VVG, the intervention value had a medium effect size compared to the baseline value, but the follow-up value decreased to a small effect size. In the between-group comparisons, during the intervention session, the VVG showed no significant effect on percent change of DT but had a medium effect size compared to the VG (p=0.050, Cohen's d=0.764). During the follow-up session, retention effect did not persist (p=0.311, Cohen's d=0.381). Conclusions: RUSI can be used to provide visual biofeedback and improve performance and retention in the ability to activate the diaphragm muscle in healthy subjects. Future research needs to establish a protocol for respiratory intervention to maintain the effect of diaphragmatic breathing training using RUSI with visual feedback.

• 대한토목학회논문집
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• 제10권4호
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• pp.123-132
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• 1990

본논문(本論文)은 굴(堀)착깊이에 따르는 지중연속벽(地中連續壁)의 토지변동(土地變動)에 관(關)하여 벽체(壁體)의 강성(剛性), 흙의 밀도(密度), 근입(根入)깊이비(比) 벽체이동(壁體移動)에 기인(起因)되는 strut 설치지점(設置地點)의 선행변위등(先行變位等)의 요소(要素)들을 고려(考慮)한 탄소성(彈塑性) model을 제시(提示)하고 몇 가지 경우(境遇)에 대(對)하여 수치해석(數値解析)한 결과(結果)를 요약(要約)하면 다음과 같다. 1. 변동영역(變動領域)에서의 탄소성한계비(彈塑性限界比)는 벽체(壁體)의 강성(剛性), 모래의 밀도(密度) 및 근입(根入)깊이비(比)가 증가(增加)됨에 따라 감소(減少)되는 현상(現像)을 나타낸다. 2. 벽체(壁體)의 최대(最大) 휨-모멘트값은 모래의 밀도(密屠)가 클수록 감소(減少)하고 벽체강성(壁體剛性)의 영향(影響) 근입(根入)깊이비(比)에 비례(比例)하여 커진다. 3. 최대(最大) strut 반력(反力)은 모래의 밀도(密度)에 반비례(反比例)한다. 4. strut 설치지점(設置地點)의 지중선행변위(地中先行變位)는 deflection에 큰 영향(影響)을 줌으로 반드시 고려(考慮)되어야한다.

• 한국지반공학회논문집
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• 제38권12호
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• pp.45-65
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• 2022

본 논문에서는 유한차분해석 프로그램인 FLAC을 이용하여 사질토 지반을 지지하는 지하연속벽을 모델링 하고, 내진해석을 수행하였다. 그리고 수치해석 결과를 동일한 조건에서 수행된 원심모형실험 결과와 비교하여, 흙막이 구조물의 내진해석을 위한 수치 모델링의 적정성을 검증하였다. 전반적으로 벽체에 발생한 모멘트 분포도가 매우 유사하였고, 지하연속벽의 상단과 배면지반에서 산정한 가속도의 최대값이 약 5%이내의 차이를 보이는 것으로 나타났다. 검증된 모델을 활용하여 다양한 지반조건과 굴착조건, 그리고 입력하중 조건에서 동적 수치해석 변수연구를 수행하였다. 지진 중 가시설 벽체와 지보재에 발생한 최대 응력을 굴착 중 발생한 최대 응력과 비교하여, 내진설계가 필요한 흙막이 가시설 조건을 개략적으로 선정하였다. 토사지반을 지지하는 흙막이 벽체는 재현주기 100년의 지진하중에 의해 벽체 모멘트가 최대 17%까지 증가하였고, 특히 느슨한 토사층에 위치한 지보재는 최대 32%까지 축력이 증가하여 구조설계를 위한 내진해석이 필요할 것으로 판단된다.