• Journal of the Korean Society of Radiology
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• v.17 no.7
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• pp.1033-1039
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• 2023

Low-dose chest CT, which is used as a lung screening test, also includes information on coronary artery calcification within the scan range. The purpose of this study was to investigate the usefulness of determining coronary artery calcification using Low-dose chest CT. Those who underwent low-dose chest CT and coronary artery calcification score CT on the same day were eligible. Coronary artery calcium score CT results were divided into 4 groups (Low: 1〈CACS〈10, Mild: 10〈CACS〈100, Moderate: 100〈CACS〈400, High: 400〈CACS) by referring to the Coronary artery calcium score categories and risks. After selecting 30 people each group, five radiotechnologists with more than 15 years of experience in coronary artery calcium measurement retrospectively analyzed the presence or absence of coronary artery calcification in low-dose chest CT images. The results of the five observers' uniform interpretation of the low-dose chest CT image were consistent with the coronary artery calcium score CT results in Low group: 56%, Mild group: 96.6%, Moderate group: 100%, and High group: 100%. appeared. In the Low group, all 5 observers observed calcification in 17 out of 30 cases, and in 7 cases all 5 observers decided that calcification could not be identified. Coronary artery calcification could be observed in 100% of asymptomatic adults with a calcium score of 15 or higher in low-dose chest CT scans. The minimum calcium score that can be identified is 1, and it was found that even very small calcifications can be identified when the subject's body size is small or the scan is performed at a time when heart movement is minimal.

• Journal of Chest Surgery
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• v.31 no.11
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• pp.1023-1030
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• 1998

Background: Calcific degeneration limits durabilities of the bioprosthetic tissues implanted in the human body. The direct coupling sulphonated polyethyleneoxide(PEO-SO3) to the bioprosthetic tissues after glutaraldehyde(GA) fixation and the removal of residual aldehyde groups from the tissues can augment the effect of calcification-resistance. Materials and methods: To study the anti-calcification effect by PEO-SO3 modification and the removal of the residual aldehyde groups of tissues, surface modified bovine pericardia(BP-PEO-SO3) were preserved in aseptic saline to wash out GA(saline group) and 0.65% GA solution(GA group). And then above two groups and PERIGUARD (Bio-vascular. Co.) (product group) were evaluated with respects to calcium contents and microscopic findings using in vivo implantation models at carotid and femoral artery and peritoneum of 8 adult dogs. Results: In the tissues retrieved from carotid artery, calcium content was significantly decreased in saline group than in other two groups(saline; 2.89±0.31 vs. GA; 6.14±1.08 vs. product; 22.82±5.00 mg/g of dried tissue; p<0.05). In the tissues retrieved from femoral artery and peritoneum, calcium amount was also decreased in saline group than in other two groups, but not reached the significant difference between groups. On the other hand, the pathologic findings of pericardial tissues showed marked destructuction in GA group compared to the other two groups. Conclusions: In this study, covalently PEO-SO3 bound to bovine pericardium decreased calcifications and the anti-calcification effect of BP-PEO-SO3 could be augmented by the washing out the residual aldehyde groups using saline after GA fixation. Conclusively, the PEO-SO3 modified bovine pericardium is highly resistant to calcification and can be useful for the development of calcification-resistant cardiovascular patches and valves.

• (The)Study of the Eastern Classic
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• no.41
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• pp.445-476
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• 2010

In this essay I aimed to analyze the concept of cultivation in east asian aesthetics. Most people regarded traditional asian paintings as an artwork that was obviously an artwork by artists. Moreover, they emphasized the cultivation of artists in their creation and used to accept the concept of cultivation which means cultivating one's mind. Generally speaking, to cultivate one's mind meant enlarging one's ethical behavior and he or she became a better person. And in creation, it meant considering all things more deeply. In this point of view, it was too vague to notice the meaning. What is an accurate meaning of cultivate artist's mind? What was the relation between creation and cultivation? In confucian philosophy, the concept of cultivation had two meanings. One was to enlarge one's ethical behavior and the other was to improve one's knowledge about things. The knowledge implied all of the one's experiences about things. Thus, the knowledge meant what he communicated with under his surroundings and created. In this perspective, to analyze the case of "Dohwaguenmungi" and "Limchungochi", cultivation was related to 'you(游)' and 'jing(精)'. It implied all of the artist's efforts to make communication with his objects deeper and wider, at last, he created his own meaning about object that he experienced. Therefore, I suggest that when we use the concept of cultivation in the context of creation, it should be used as the meaning related with improving one's knowledge about things.

• Journal of Chest Surgery
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• v.42 no.2
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• pp.157-164
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• 2009

Background: Various studies and experimental trials have been done to develop bioprosthetic devices to treat complex congenital heart disease due to the limited usage of homograft tissue. The purpose of the present study was to evaluate the effect of diamine bridges with using L-lysine, as compared with using ethanol. Material and Method: Porcine pericardium was fixed at 0.625% GA (commercial fixation). An interim step of ethanol (80%; 1 day at room temperature) or L-lysine (0.1 M; 2 days at $37^{\circ}C$) was followed by completion of the GA fixation (2 days at $4^{\circ}C$ and 7 days at room temperature). The tensile strength and thickness of the porcine percardium were measured, respectively. The treated pericardiums were implanted subcutaneously into three-week old Long-Evans rats for 8 weeks. The calcium content of the implants was assessed by atomic absorption spectroscopy and the histology. Result: Ethanol pretreatment ($13.6{\pm}10.0ug/mg$, p=0.008), L-lysine pretreatment ($15.3{\pm}1.0 ug/mg$, p=0.002), and both treatment ($16.1{\pm}11.1ug/mg$, p=0.012) significantly inhibited calcification, as compared with the controls $(51.2{\pm}8.5ug/mg)$. L-lysine pretreatment ($0.18{\pm}0.02mm,\;1.20{\pm}0.30kg$ f/5 mm) significantly increased the thickness and tensile strength, as compared with ethanol pretreatment ($0.13{\pm}0.03mm,\;0.85{\pm}0.36$ 1.0 kg f/5 mm) (p<0.01, p=0.035). Conclusion: The diamine bridges using L-lysine seemed to decrease the calcification of porcine pericardium fixed with glutaraldehyde, and this was comparable with Ethanol. Additionally, it seemed to enhance the thickness and tensile strength.

• The Journal of Korean Association of Computer Education
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• v.3 no.2
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• pp.11-20
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• 2000

This study is to develop the web-based English learning courseware and improve the motivational attributes, with systematic methods called the ARCS model of Keller. There are four categories to the ARCS motivation model : Attention, Relevance, Confidence, Satisfaction. Applying these four components to web-based courseware strategically will enable learners to be taught English conversation more effectively and more systematically. In order to implement this study, the main web pages are made of ASP(Active Server Page). Personal Web Server is used as the web sever and Authorware is employed as a courseware authoring tool.

• Journal of the korean academy of Pediatric Dentistry
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• v.28 no.1
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• pp.12-15
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• 2001

Dilaceration is a tooth abnormaly occuring in the histo-morphodifferention stage resulting from disturbance between the uncalcified and already calcified portion that affects both the crown and root. The involved tooth is usually the maxillary central incisor and it also shows high prevalence of impaction. The cause of dilaceration can be either from the trauma of the primary tooth, ectopic development of the tooth germ or from cysts. And it is also found in some cases of Otodental syndrome, Hurler syndrome, Cleidocranial dysostosis. The purpose of this study is to show that periapical lesions caused by dental caries can be another factor in causing dilaceration.

• The Journal of the Korea Contents Association
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• v.15 no.11
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• pp.50-57
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• 2015

The fact that Disney studio produced several propaganda animations for the U. S. Government during World War II, is not widely known to the public. Der Fuehrer's Face that this essay centrally deals with totally includes the characteristics of signification and aesthetics in Disney animation. And, Der Fuehrer's face shows the tendency that represent the connotative theme of the work and myth to the audience, based on the typified character and the imagery of spaces in the work. Therefore, from this perspective, the semiotic studies on Der Fuehrer's Face is ultimately the approach to the characteristics of Disney animation's representation and communication that is established, through experimental trials and efforts.

• Journal of Digital Contents Society
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• v.8 no.4
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• pp.623-629
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• 2007

In the study of Art History and Archaeology, the paintings, sculptures, relief, and applied arts provide a vivid description of religious and historical events and everyday life. Through these descriptions it is possible to gain a greater understanding of things such as the customs, culture, and architectural styles of that period. However, if Art History and Archaeological images are very old, distorted or underexposed, it is difficult to analyze them. Using Levels and Curves is one way to tonally correct professional photographs. It is an effective method for tonal correction because of the exact numeric values which are calculated and displayed as the image is adjusted. In this paper, the usefulness of this method for correcting a distorted archaeological image was examined.

• The Journal of the Korea institute of electronic communication sciences
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• v.10 no.2
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• pp.297-304
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• 2015

Importance and necessity is enlarged due to globalization. So, English education is diverse and recently applies AR(Augmented Reality) technology to offer immersion and interest. Contents in this paper are Mobile AR contents for training infant English cognition. Our system displays teaching aid objects into 3D models, lets infants listen to English conversation and teaches them everyday English like a play. Considering infants that like games, this system adds an English game about each object of teach aids. To attract infants and parents interest persistingly, We give them immersion and interest by suggesting a different event at each step.

• Journal of Conservation Science
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• v.6 no.1 s.7
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• pp.71-78
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• 1997

Oil painting shows a wide variety of damages due to differentcohesiveness between materials and different responses to temperature and humidity. The deforming flatness of canvas is a major cause of deterioration. The heat, pressure and moisture, and classical materials which had been traditionally used to correct the deformation of supports have caused damages to the paintings. In modern restoration of paintings, new methods have been developed to avoid the use of such potentially harmful elements. In this paper the correcting of deformed support with the use of low-pressure table, deformation correction frame and new materials, which has been developed both to protect the works and to maximize the effect of restoration.