• Journal of the Korean Society for Advanced Composite Structures
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• v.3 no.1
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• pp.29-34
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• 2012

Even though the longitudinally stiffened laminated composite plates with closed section ribs should be an effective system for axially compressed members, the existing researches on the applications of closed-section ribs, especially for the laminated composite plates, are not sufficient. This study is aimed to examine the influence of the sectional stiffness of U-shaped ribs on the buckling modes and strengths of laminated composite plates. Applying the orthotropic plates with eight layers of the layup $[(0^{\circ})_4]_s$ and $[(0^{\circ}/90^{\circ})_2]_s$, 3-dimensional finite element models for the U-rib stiffened plates were setup by using ABAQUS and then a series of eigenvalue analyses were conducted. From the parametric studies, the minimum required ply thicknesses as well as the buckling strengths were presented for the analysis models. The buckling strengths were compared with the theoretical critical stress equation for simply supported plates based on the Classical laminated plate theory. This study will contribute to the future study for evaluating the minimum required stiffness and optimum design of U-rib stiffened plates.

• Journal of Chest Surgery
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• v.24 no.5
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• pp.480-484
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• 1991

Traumatic rupture of the main bronchus is comparatively very rare. With the advent of widespread mechanization and high-speed era, the incidence of traumatic rupture of the tracheobronchial tree has been increased considerably. Rupture of the bronchus is an unusual result of nonpenetrating trauma to the chest. Early recognition of bronchial rupture and emergency thoracotomy and management is essential for reducing of morbidity, mortality and late complications. We experienced 3 cases of bronchial rupture caused by nonpenetrating chest trauma with or without rib fracture. Patients were suffered from dyspnea and chest pain. After closed thoracostomy, corrective surgery was performed. Postoperative courses were uneventful and discharged without any complication.

• Journal of Chest Surgery
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• v.20 no.2
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• pp.427-431
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• 1987

A case is presented of a steering wheel Injury to the chest which developed right atrial free wall rupture and cardiac tamponade without rib fractures or hemo-pneumothorax. A 30 year old man who sustained, blunt chest trauma by steering wheel injury to his chest developed right atrial rupture and cardiac tamponade. Pericardiocentesis was performed and cardiac tamponade was confirmed. After a median sternotomy, large right atrial free wall laceration [about 8cm] was noted. He was placed on cardiopulmonary bypass. The laceration wound of right atrium was closed with a 2 rows of continuous suture. Recovery was uneventful. The patient has returned to his previous level of activity.

• Journal of Chest Surgery
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• v.23 no.6
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• pp.1213-1220
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• 1990

During the period of January 1979 to December 1988, 220 patients with empyema thoracis were treated in the department of Thoracic and Cardiovascular Surgery, Chonnam National University Medical School Hospital. There were 167 males[75.9%] and 53 females[24.1%] ranging from 18 days to 76 years of age. Occurrence ratio of left and right empyema was 1 : 1.9. The underlying pathologic lesions of empyema were pneumonia[30.9%], pulmonary tuberculosis[22.7%], chest trauma[8.6%] and postoperative complications. In bacteriologic study, staphylococcus, pseudomonas and streptococcus accounted for 26.4%, 11.8% and 9% respectively, and 25% were not identified. Surgical treatment modalities were thoracentesis[10 patients, 4.5%], closed thoracostomy[132, 60%], closed rib resection drainage[4.2, 6%], modified Eloesser’s operation[37, 16.8%], decortication[27, 12.3%], decortication with pulmonary resection[6, 2.7%], thoracoplasty[2, 0.9%], muscle flap closure [1, 0.5%], and staged pneumonectomy[1, 0.5%], The mortality rate was 2.3% and the complications were sepsis[9 patients]. acute renal failure[4], and paralytic ileus[3].

• Transactions of the Korean Society of Mechanical Engineers
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• v.18 no.5
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• pp.1117-1125
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• 1994

A UBET program is developed for determining the optimum sizes of preform of a rib-web part in axisymmetric closed-die forging. The program consists of forward and backward tracing processes. In forward process, material flow, degree of die filling, and forging load are predicted. In backward tracing process, the optimum dimensions of initial billet and preform are determined from the final-shape data without flash. The above program is easy to handle input data with and is convenient to visualize the whole process of closed-die forging with. Experiments are carried out with pure plasticine billets at room temperature. The theoretical predictions of the forging load and the flow pattern are in good agreement with the experimental results.

• Journal of the Korea Academia-Industrial cooperation Society
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• v.14 no.2
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• pp.949-954
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• 2013

Generally, structural plates under axial compression should be stiffened by longitudinal stiffeners in order to enhance the buckling strength. Though U-shaped ribs would be more efficient for the stiffened plate system, there is in the absence of a proper design guides or relevant research results. Thus this study is aimed to examine the local buckling behavior of stiffened plates with U-section ribs. 3-dimensional analysis models which include 3 types of U-shaped longitudinal stiffeners were simulated by using the finite element code ABAQUS. The bifurcation analysis were conducted and then the buckling analysis results are compared with the theoretical equation values. It is found that the rotational constraint effect provided by the U-ribs should increase the local buckling strength. Some features drawn from a series of parametric study results are summarized.

• Journal of Chest Surgery
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• v.31 no.11
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• pp.1063-1069
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• 1998

Background: Multi-loculated empyema makes treatment difficult, and more so when thoracentesis or chest tube drainage fails. Materials and methods: From December 1991 to December 1997, we performed closed rib resectional drainage for 18 cases of loculated empyema on the fibrinopurulent or early chronic phase. Results: Surgery was performed on patients with loculated empyema complaining of persistent symptoms due to failure of treatment by thoracentesis(8 cases) or chest tube drainage(10 cases). Predisposing factors of empyema were pneumonia in 13 cases, clotted hemothorax in 3 cases, cholecystectomy, and tuberculous pleurisy in 1 case. Causal organisms were cultured in 8 cases(42.1%), and methicillin-resistant staphylococcus aureus was found in 3 cases, pseudomonas aeruginosa in 2 cases, and enterococcus aerogens, α-hemolytic streptococcus, and acinetobacter baumannii were found in 1 case. Size of loculations was various, and computed chest tomogram showed multiple loculations of empyema numbering 1∼4(mean 1.78±1.00). Operating time was relatively short, about 55∼140 mins(mean 102.8±30.8). All toxic symptoms including fever disappeared postopratively and general conditions improved very quickly in all patients. Length of chest tube indwelling time and hospital stay after surgery were 3∼42 days(mean 11.4±11.5) and 6∼36 days(mean 12.9±8.1), respectively. Complications of prolonged drainage occurred in 2 cases and no death occurred. There were no recurrences and chest x-rays taken 3∼6 months after surgery showed normal findings in 14 cases and slight pleural thickening in 4 cases. Conclusions: Closed rib resectional drainage requires very simple techniques and has excellent outcomes and little complications, therefore, we think that it is the choice of operation for patients with loculated empyema on the fibrinopurulent or early chronic phase.

• Journal of Chest Surgery
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• v.20 no.4
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• pp.715-722
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• 1987

A clinical analysis was performed on 823 cases of the chest trauma experienced at department of thoracic & cardiovascular surgery, Kyung Hee University Hospital during the past 8 years from Jan, 1978 to Aug. 1986. 1. the ratio of male to female patient of the chest trauma was 3:1 in male predominance. 2. The common age groups were 3rd, 4th and 5th decades. 3. The most common causes of the chest trauma was traffic accidents [79.8%] were injured due to non-penetrating injuries and the remainders [166/823, 20.2%] were injured due to penetrating injuries 4. The frequently injured site of the chest trauma was left side of the chest [46%], and the right side was 42% 5. The most common injury from non-penetrating trauma was rib fracture [77.5%], and the incidence rate of flail chest was 59% of all cases of rib fractures. 6. The incidence rate of hemopneumothorax was 42.9% in non-penetrating traumas, and 84.3% in penetrating traumas. 7. The most common method of surgical treatment was closed tube thoracostomy [37.3%], and open thoracotomy was performed in 71 cases [8.6%]. 8. the overall mortality was 2.2%, and common causes of death were cerebral damage, respiratory insufficiency, and hypovolemic shock.

• Fashion & Textile Research Journal
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• v.10 no.6
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• pp.1023-1035
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• 2008

This study conducted a survey to find out dermatitis patients' preferred garment performance and their sentiment in spring/summer knitwears. SPSS 12.0 program was used for factor analysis, frequency analysis, T-test, ANOVA, and Duncan test. The result was as follows; First, in garments, patients required 'health hygiene', 'practicality in use care', 'skin contact' and 'easy movement'. Especially, 'skin contact' is an important property to be considered in patients' clothes. Second, in garment sensitivity, patients importantly considered 'modesty', 'feminine', 'boldness', 'decency', 'easy movement', 'youth', and 'simplicity'. Third, patients preferred simple and modest plain knitwear in light color with thin and soft fabric such as plain knit. And especially, dot pattern in knitwears should be avoided. Fourth, the preferred style of patients was that 'appropriately fit with suitable ease.' They also preferred 'front closed,' ; 'boat neckline' and 'V neckline'; 'raglan sleeve' and 'set-in sleeve'. For hem trim, they preferred 'rib'. Male preferred simple and plain style with round collar of 'tubular trim' and 'rib trim', while female preferred sophisticated and characteristic style with setin sleeve.

• Journal of the Korean Society of Costume
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• v.57 no.5 s.114
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• pp.58-71
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• 2007

This study conducted a survey to find out atopic dermatitis patients' required performance and preference in design factors to develop spring/summer(S/S) knitwears preferred by atopic patients. On the platform of achieved information from statistical analysis, S/S knitwear samples for atopic patients were designed and constructed with cotton/Seacell(R) blended yarn, And subjective wearing sensation were evaluated comparing the samples and the commercial products made with cotton/chitosan blended yarn, trying to help producing more comfortable S/S knitwears for atopic patients. SPSS 12.0 program was used for frequency analysis, Chi-square analysis, ANOVA, and Duncan test. The result was as follows; For comfort of S/S knitwears, atopic patients most considered skin care property. Atopic patients preferred simple and basic knitwear in light color with thin and soft fabric such as plain knit. The preferred style was that 'appropriately fit with suitable ease'. They also preferred 'closed front'; 'boat neckline' and 'V neckline'; 'raglan sleeve' and 'set-in sleeve'. For hem trim, they preferred 'rib' structure. Male preferred simple and plain style with 'round collar' and 'tubular or rib trim", while female preferred sophisticated and characteristic style with 'set-in sleeve' with 'rib trim'. Under the circumstances with insufficient functional knitwears developed, this study tried to develop comfort S/S knitwears for atopic dermatitis patients and the developed knitwears showed as good as or better performance in wearing feeling, fitting, and appearance than the previously developed functional goods.