• Korean Journal of Bronchoesophagology
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• v.15 no.1
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• pp.56-59
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• 2009

Tracheal rupture is infrequently reported, but it is considered to be fatal condition. The most common cause of tracheal rupture is neck injury, but, rarely reported after tracheal intubation. We report a 49-year old woman with dyspnea presenting tracheal rupture after endotracheal intubation. It is detected that tracheal rupture with herniation of esophagus at the level of T1 spine by computed tomography and bronchoscopy. We had a successful repair by suturing between tracheal and esophageal wall. The patient was followed up without any complication.

• Composites Research
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• v.20 no.4
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• pp.31-41
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• 2007

Dome shape design methods of Filament Winding (FW) composite pressure vessel, which can suggest various dome contour according to the external loading conditions, were investigated analytically and numerically. The performance indices(PV/W) of the pressure vessels with same cylinder radius and boss opening but different dome shape were evaluated by finite element analysis under the internal pressure loading condition. The analysis results showed that as the dome shape becomes flat, the performance index decreases significantly due to the reduced burst pressure. Especially, for the case of the high value of the parameter ro, the ratio between the radii of the cylinder part and the boss opening, the flat dome is disadvantageous in the aspect of the weight reduction, and additional reinforcing dome design technique should be required to increase the burst pressure. For example, above ro=0.54 condition, the dome shape change according to the loading condition could cause the low burst pressure and increase of composite weight in dome region and is not recommendable except for the special case that maximum inner volume or sufficient space between skirt and dome is the primary design objective. However, at ro=0.35, the dome shape change brings not so significant differences in the performance of FW vessel.

• Journal of Chest Surgery
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• v.31 no.11
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• pp.1076-1080
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• 1998

Background: Spontaneous hemopneumothorax, occurring in 1% to 12% of patients with spontaneous pneumothorax, is a rare disorder that can potentially lead to life-threatening complications. Materials and methods: We have experienced 15 cases (2.28%) with spontaneous hemopneumothorax among 659 episodes of spontaneous pneumothorax for eight years, from 1990 to 1997, at our hospital. We studied our previously treated patients by retrospective case studies to determine the nature of optimal management. Results: There were 14 male and 1 female patients whose mean age was 27.5 years, ranging from 19 to 58. The sides with disorder were as following: right in 10 cases and left in 5, unilaterally. The amount of initial bleeding ranged from 400 to 1,500 mL and 8 patients received a homologous blood transfusion. Patients exhibited symptoms of chest pain, dyspnea, chest discomfort, and hypovolemic shock. We concluded that causes of this disease in our patients were a torn pleural adhesion (14 cases) and a rupture of vascularized bullae (1 case with an underlying intrinsic lung disease, tuberculosis). All patients underwent closed thoracostomy and had good results except for 3. One patient underwent thoracotomy within 3 days from the onset because of continuous active hemorrhage. Decortication was required in one case because of a reactive fluid collection in the pleural space, which led to impaired lung expansion. Another patient underwent thoracotomy due to a ipsilateral recurrent pneumothorax without blood collection. Conclusions: The goals of treatment include hemostasis and reexpansion of the collapsed lung. Thus, if patients arrive early at hospital, closed thoracostomy and transfusion are thought to be sufficient treatments, although early surgical repair has been considered recently.

• Korean Journal of Bronchoesophagology
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• v.5 no.1
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• pp.14-21
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• 1999

Perforating injury of the thoracic esophagus leads to an almost Immediate exposure of the mediastinum to both oral secretions and refluxed gastric contents. And necrotizing inflammatory response developed inevitably. So, without proper managements, mediastinitis results in severe dehydration or septic conditions, and consequently the life of the patient can be threaten. We experienced recently 4 cases of esophageal perforation. Three cases were Boerhaave's syndromes and the other one was instrumental perforation in patient with corrosive esophageal stricture. Curative surgical procedures were done in 3 cases and the drainage procedure was only possible in the other one due to hepatic failure. And the patient with the drainage management was dead.

• Journal of the Korean Society for Aeronautical & Space Sciences
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• v.45 no.11
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• pp.922-931
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• 2017

This research paper describes design procedures and those verification with multi-body dynamic analysis and an experiment for the development of an unprecedented type of canister cover, named as the separating cover. In order to overcome drawbacks from the precious rupture type and actuator driven cover, the separating cover was suggested. It has the simplest structure composed of the previously developed explosive bolt and a spring-lever driven system. First of all, mechanical feasibility with proposed design parameters based on mathematical modeling was confirmed through dynamic analysis and then its results showed good agreement with the followed empirical results acquired from a high speed camera. On top of that, a parametric study was conducted to identify the effect of each design parameter on separating performance. It is highly expected that this research contributes to provide military industries with a brand new canister cover having simplicity and cost efficiency and thus it will be very useful in MLRS(Multiple Launch Rocket System).

• Clinical and Experimental Pediatrics
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• v.48 no.6
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• pp.655-659
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• 2005

Esophageal duplication cysts are rare congenital lesions that occur as a result of a failure in the tubulation of the esophagus. They are most frequently single, tubular, or cystic. They may cause compressive symptoms or may be discovered incidentally on chest radiographs. They become symptomatic when complications develop. Symptoms often are related to the location of the duplication; esophageal lesions can create respiratory difficulties. The definitive diagnosis of esophageal duplication cysts requires the pathological evaluation of the cyst after surgical removal. We experienced a rare tubular esophageal duplication, in a 2-month old girl who presented with fever and grunting. This is the first reported case in which the sequence of events of ruptured tubular esophageal duplication with empyema, mediastinitis and aneurysm occured.

• Journal of the Korea Concrete Institute
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• v.28 no.3
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• pp.365-373
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• 2016

Ultra-High-Performance Steel Fiber-Reinforced Concrete (SUPER Concrete) exhibits improved compressive and tensile strengths far superior to those of conventional concrete. These characteristics can significantly reduce the cross sectional area of the member and the anchorage strength of a headed bar is expected to be improved. In this study, the anchorage strengths of headed bars with $4d_b$ or $6d_b$ embedment length were evaluated by simulated exterior beam-column joint tests where the headed bars were used as beam bars and the joints were cast of 120 or 180 MPa SUPER Concrete. In all specimens, the actual yield strengths of the headed bars over 600 MPa were developed. Some headed bars were fractured due to the high anchorage capacity in SUPER Concrete. Therefore, the headed bar with only $4d_b$ embedment length in 120 MPa SUPER Concrete can develop a yield strength of 600 MPa which is the highest design yield strength permitted by the KCI design code. The previous model derived from tests with normal concrete and the current design code underestimate the anchorage capacity of the headed bar anchored in SUPER Concrete. Because the previous model and the current design code do not consider the effects of the high tensile strength of SUPER Concrete. From a regression analysis assuming that the anchorage strength is proportional to $(f_{ck})^{\alpha}$, the model for predicting anchorage strength of headed bars in SUPER Concrete is developed. The average and coefficient of variation of the test-to-prediction values are 1.01 and 5%, respectively.

• Journal of Chest Surgery
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• v.8 no.2
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• pp.119-124
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• 1975

This is a case report of the rupture of the trachea and the esophagus following external blunt trauma without any associated injury. A 7 year old male patient was brought to the emergency room. Hanyang University Hospital, on 23 Jul, 1974 while he played under the pile of pingpong table A table was fall down over the patient accidentally. The patient was injured by the table and found lying in unconsciousness on the ground.There was subcutaneous emphysema on his anterior chest and neck. A contusion on the upper part of the sternum was noted. The breathing sound were diminished over the left side of the chest. Ronchi were heard over the right lung field. This patient was suffered from vomiting, dypsnea, and irritable mental state after this accident. On the chest roentgenogram in A-P view, hyperlucency at the mediastinum and parapericardiac area suggested the pneumomediastinum. On the next day, a diagnosis of the tracheal and esophageal rupture was confirmed by the esophagogram with Lipiodol swallowing. A right thoracotomy was performed and ruptured orifice of the trachea and the esophagus were closed with interrupted sutures. Postoperative course was uneventful and primary closure of the rupture of the trachea and the esophagus were succeeded.

• Journal of Chest Surgery
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• v.25 no.8
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• pp.812-818
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• 1992

The spontaneous rupture of the esophagus is an uncommon disease, but without early diagnosis and treatment, the mortality rate is high. This report is on the two cases treated at the Department of Thoracic and Cardiovascular Surgery, College of Medicine, Kyu-ngpook National University. The first patient, after heavy drinking, had vomiting followed by chest pain, dyspnea and subcutaneous emphysema. After diagnosis using an esophagogram, an operation was perfomed. About a 4cm rupture was found at the lower left part of the esophagus and was primarily sutured with the intercostal muscle. The patient was weaned from the ventilator after 40 hours. The second patient had symptoms the same as the first case. Six days after the app-earence of the symptoms, the patient was treated by the Thais onlay gastric patch method. The leakage happened after the surgery and he received a conservative treatment. After discharge no abnormalities, such as leakage and stricture, were found on the eso-phagogram The two patients now live a normal life.

• Journal of Energy Engineering
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• v.23 no.3
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• pp.146-149
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• 2014

Compared to Butane tank, the propane tank should have a higher compressive strength due to its higher vapor pressure. In this study, a theoretical analysis was performed to evaluate the effect of change in the geometry of bottom plate on the mechanical property of tank, and an experiment was also carried out to observe the propensity of the deformation and failure of the vessel using hydraulic pressurizing device. The compressive strength of the vessel was observed to improve 1.5-2.5 MPa as the curvature of the bottom plate was decreased 62 mm and the thickness of the bottom plate was increased 0.25 mm. This study are expected to provide viable information conducive to achieve on-going development of a small vessel for the pressurized propane gas.