• Proceedings of the Korean Institute of Building Construction Conference
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• 2015.05a
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• pp.226-227
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• 2015

This research is to measure and analyze the thermal performance of the apartment structure and to evaluate and establish standards of thermal insulation defect in order to make the basic data necessary for determining the degree of the thermal performance degradation and for repairing and reinforcing the exterior wall of the existing apartment. The following conclusions could be derived thorough the investigation of outer wall temperature distribution and the insulation assesment experiments using a model of specimens for the apartment houses' outer walls. It was confirmed that for the thermal performance through the insulating material thicknesses 5cm, 8cm in walls, the thermal insulation thickened by 3cm, from 5cm to 8cm, but that the actual temperature difference reached only about 1 ~ 2℃. This implies that the thermal performance improvement using the thermal insulation in walls is not significant and that it is difficult to insulate the thermal bridge area.

• Transactions of the Korean Society of Mechanical Engineers B
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• v.21 no.5
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• pp.628-636
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• 1997

Flow visualization technique incorporating photochromic dye is used to study the flow characteristics of the gravity driven laminar wavy film. The film thickness and wave speed are successfully measured by flow visualization. As the inclination angle increases, the waves have higher peaks and lower substrate thickness. The measured cross stream velocity at the free surface is up to 10% of stream wise velocity, which shows enhanced mixing in the lump of the film. The measured stream wise velocity profiles are close to parabolic profile near the substrate and the peak but show significant velocity defect near the rear side of the wave. The measured wall shear rate distributions show good agreement with the previous workers' numerical results.

• Journal of Chest Surgery
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• v.54 no.5
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• pp.400-403
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• 2021

A 63-year-old patient was admitted with a sternal fracture and mass. On evaluation, most of the body of the sternum had been destroyed by a tumor. Radical resection of the sternum was performed and part of the major pectoral muscles adherent to the sternal tumor was also resected. The chest wall defect was reconstructed with mesh, bone cement, and a titanium rib plate system. Reconstruction with this method seemed to be an appropriate procedure to prevent instability of the chest wall.

• Korean Journal of Radiology
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• v.21 no.9
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• pp.1104-1113
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• 2020

Objective: To assess the regional ventilation in patients with asthma-chronic obstructive pulmonary disease (COPD) overlap syndrome (ACOS) using xenon-ventilation dual-energy CT (DECT), and to compare it to that in patients with COPD. Materials and Methods: Twenty-one patients with ACOS and 46 patients with COPD underwent xenon-ventilation DECT. The ventilation abnormalities were visually determined to be 1) peripheral wedge/diffuse defect, 2) diffuse heterogeneous defect, 3) lobar/segmental/subsegmental defect, and 4) no defect on xenon-ventilation maps. Emphysema index (EI), airway wall thickness (Pi10), and mean ventilation values in the whole lung, peripheral lung, and central lung areas were quantified and compared between the two groups using the Student's t test. Results: Most patients with ACOS showed the peripheral wedge/diffuse defect (n = 14, 66.7%), whereas patients with COPD commonly showed the diffuse heterogeneous defect and lobar/segmental/subsegmental defect (n = 21, 45.7% and n = 20, 43.5%, respectively). The prevalence of ventilation defect patterns showed significant intergroup differences (p < 0.001). The quantified ventilation values in the peripheral lung areas were significantly lower in patients with ACOS than in patients with COPD (p = 0.045). The quantified Pi10 was significantly higher in patients with ACOS than in patients with COPD (p = 0.041); however, EI was not significantly different between the two groups. Conclusion: The ventilation abnormalities on the visual and quantitative assessments of xenon-ventilation DECT differed between patients with ACOS and patients with COPD. Xenon-ventilation DECT may demonstrate the different physiologic changes of pulmonary ventilation in patients with ACOS and COPD.

• Journal of Chest Surgery
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• v.24 no.9
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• pp.913-917
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• 1991

Ventricular septal defect complicating myocardial infarction is rare but fatal condition which requires early surgical intervention before end-organ failure ensues from cardiogenic shock. Since the first successful repair by Cooley et al in 1956, surgical skills and strategies were developed and modified to a great extent, and we adopted the new repair technique in our case which stresses that minimal or no part of the infarcted septum and left ventricular wall be resected. This technique obviates the need to resect the infarcted part of the septum and prevents recurrence of an even larger VSD, and provides adequate size and shape of the left ventricle after of transinfarction left ventriculotomy.

• Journal of Chest Surgery
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• v.15 no.3
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• pp.325-330
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• 1982

A case of a 7 year old girl with rare congenital anomalies is reported. The anomalies as called Cantrell`s pentalogy is consisted of defect in supraumbilical abdominal wall, ventral diaphragm, adjacent pericardium, and lower sternum associated with cardiac malformation. Her cardiac lesion was muscular diverticulum of left ventricle. The diverticulum was resected and the other defects were repaired successfully.

• Carbon letters
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• v.8 no.4
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• pp.269-273
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• 2007

During a 4-year period (2001-2005) 09 animals were surgically treated because of abdominal wall defects (hernia). Out of 9 animals 8 were bovines and one caprine. In each case the defect was repaired with carbon fibre mesh. All the cases were successfully treated and no complication was observed up to six months postoperatively.

• Journal of Chest Surgery
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• v.27 no.1
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• pp.68-71
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• 1994

A tracheo-esophageal fistula following from blunt chest trauma is one of less common lesion and few guidelines are available to direct its optimal management. Herein, we report a 24-year-old man injured in a motor vehicular accident sustained a nonpenetrating double blowout injury of the thorax and large tracheoesophageal fistula occurred. Tracheal defect required resection and reconstruction, of which the membranous portion underwent closure with borrowed adjacent esophageal wall primarily and substernal left colon interposition was performed 4 weeks later.

• Journal of Periodontal and Implant Science
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• v.38 no.1
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• pp.7-14
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• 2008

Purpose: Chitosan & chitosan derivative(eg. membrane) have been studied in periodontal regeneration, and recently many studies of chitosan have reported good results. If chitosan's effects on periodontal regeneration are enhanced, we can use chitosan in many clinical and experimental fields. For this purpose, this study reviewed available literatures, evaluated comparable experimental models. Materials and Methods: Ten in vivo studies reporting chitosan's effects on periodontal tissue regeneration have been selected by use of the 'Pubmed' and hand searching. Results: 1. In Sprague Dawley rat calvarial defect models, amount of newly formed bone in defects showed significant differences between chitosan/chitosan-carrier/chitosan-membrane groups and control groups. 2. In beagle canine 1-wall intrabony defect models, amount of new cementum and new bone showed significant differences between chitosan/chitosan-membrane groups and control groups. The mean values of the above experimental groups were greater than the control groups. Conclusion: The results of this study have demonstrated that periodontal regeneration procedure using chitosan have beneficial effects, which will be substitute for various periodontal regenerative treatment area. One step forward in manufacturing process of chitosan membrane and in use in combination with other effective materials(eg. bone graft material or carrier) may bring us many chances of common use of chitosan in various periodontal area.

• Archives of Craniofacial Surgery
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• v.21 no.2
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• pp.99-105
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• 2020

Background: Due to the different handling properties of unsintered hydroxyapatite particles/poly-L-lactic acid (uHA/PLLA) and polycaprolactone (PCL), we compared the surgical outcomes and the postoperative implantation accuracy between uHA/PLLA and PCL meshes in orbital fracture repair. Methods: Patients undergoing orbital wall reconstruction with PCL and uHA/PLLA mesh, between 2017 and 2019, were investigated retrospectively. The anatomical accuracy of the implant in bony defect replacement and the functional outcomes such as diplopia, ocular motility, and enophthalmos were evaluated. Results: No restriction of eye movement was reported in any patient (n= 30 for each group), 6 months postoperatively. In the PCL group, no patient showed diplopia or enophthalmos, while the uHA/PLLA group showed two patients with diplopia and one with enophthalmos. Excellent anatomical accuracy of implants was observed in 27 and 22 patients of the PCL and uHA/PLLA groups, respectively. However, this study showed that there were neither any significant differences in the surgical outcomes like diplopia and enophthalmos nor any complications with the two well-known implants. Conclusion: PCL implants and uHA/PLLA implants are safe and have similar levels of complications and surgical outcomes in orbital wall reconstruction.