• The Journal of the Korean dental association
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• v.11 no.5
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• pp.337-340
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• 1973

The authers have studied the marginal leakage on various filing materials : Composite resin, Polycarboxylate cement, Zinc phosphate cement, Silicate cement and Zinc-oxide eugenol cement, by means of penetration of 2% aquous methylene blue between cavity walls and filing materials at body temperature and at thermal changs in the range of 4~60℃ The results revealed as follows. 1) All the filling materials revealed the penetration of dye between cavity walls and filling materials. 2) Zinc-oxide eugenol cement was the most effective to prevent the dye penetration on the contrary silicate cement cases showed greatest leakage at 37℃ and at temperature changes in range of 4-60℃. 3) The composite resin showed moderate leakage either at 37℃ or at thermal changes 4) Marginal obstructions of polycarboxylate cement were unsatisfactory at 37℃ and at temperature changes.

• Proceedings of the KIEE Conference
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• 2005.07c
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• pp.2389-2391
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• 2005

In this paper, a compact S type resonator is presented, where the proposed resonator is surface micromachined over transmission lines or other resonators, in order to obtain a wide range of possible electromagnetic couplings. The structure has been applied in two compact, bandstop and bandpass filters with moderate fractional bandwidths (FBW) of 20% and 25% respectively. The bandstop filter presented, was designed by the combination of two design methods in order to obtain the proposed fractional bandwidth, where traditionally, coupled resonator bandstop filters have been used for narrow stopbands. The bandpass filter illustrates the use of the proposed suspended resonator structure to obtain a wide range of electric type coupling coefficients, and external quality factors for the filter. This paper describes the design methodology, concepts and fabrication method proposed for the design of these filters.

• The Bulletin of The Korean Astronomical Society
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• v.43 no.2
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• pp.56.3-56.3
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• 2018

We proceed to develop the control software of GMACS, which is a wide-field, multi-object, moderate-resolution optical spectrograph for the Giant Magellan Telescope (GMT). Flexure Compensation System (FCS) prototype is one of the electronics and mechanical prototypes for GMACS. In this poster, we present the software design for the FCS prototype by using the software system modeling language, SysML. We also show two development tools to control the prototype that communicates via EtherCAT: using TwinCAT and Visual C++ on Windows 10, and GMT Software Development Kit (SDK) and C++ on Linux. We discuss the way to design the GMACS control software, which would not depend on the development tools.

• The Bulletin of The Korean Astronomical Society
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• v.44 no.2
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• pp.46.3-46.3
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• 2019

We present the control software and its development process for a prototype of the Camera and Grating Articulation System (CGAS) for GMACS, a wide-field, multi-object, moderate-resolution optical spectrograph for the Giant Magellan Telescope (GMT). The CGAS prototype is currently designed for the camera articulation controller as a miniature model of the GMACS. The camera articulation package (CAP) is a software that controls two stepper motors to adjust the camera angle. The package is developed using Visual C++ and runs on Windows 10. We discuss the architectural design and communication route between the high-end user software and the electronics hardware.

• Tuberculosis and Respiratory Diseases
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• v.54 no.4
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• pp.386-394
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• 2003

Background : ATS(American Thoracic Society) defined new guidelines for COPD(chronic obstructive lung disease) in April 2001, following the results of the global initiative for chronic obstructive lung disease. The most important concept of COPD is an airflow limitation which is not fully reversible compared to bronchial asthma(BA). The criteria for COPD are postbronchodilator $FEV_1$ less than 80% of the predicted value and an $FEV_1$ per FVC ratio less than 70%. The global initiative for asthma(GINA) study defined asthma, which included immune-mediated chronic airway inflammatory airway disease, and found that airflow limitation was wide spread, variable and often completely reversible. Taken together COPD and BA may be combined in airflow limitation. This study was designed to evaluate the prevalence of BA in patients with COPD of moderate to severe airflow limitation. Methods : COPD was diagnosed by symptoms and spirometry according to ATS guidelines. Enrolled subjects were examined for peak flow meters(PFM), sputum eosinophils and eosinophil cationic protein(ECP) levels, serum total IgE with allergy skin prick test, and methacholine bronchial provocation test(MBPT). Results : About 27% of COPD patients with moderate to severe airflow limitation were combined with BA. There was significantly decreased response to PFM in severe COPD. However, there was no significant relationship between BA and COPD according to the degree of severity. The BA combined with COPD group showed significantly high eosinophil counts and ECP level in induced sputum. However, neutrophil counts in induced sputum showed significant elevation in the pure COPD group. Conclusion : Twenty-seven percent of COPD patients with moderate to severe ventilation disorder were combined with BA, but there were no significant differences according to the degree of severity.

• International journal of advanced smart convergence
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• v.10 no.4
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• pp.124-133
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• 2021

The purpose of this study is to analyze the types of latent profiles of high school students' fire safety awareness and to identify the characteristics of related variables. For this purpose, a survey was conducted from March 22 to May 25, 2021 for 1054 high school students (male; 569, female; 485) in 3 cities, in Jeollabuk-do. The latent profile was analyzed using a scale consisting of 4 sub-factors: 'fire prevention', 'fire preparedness', 'indirect fire response', and 'direct fire response'. It was checked whether there were differences according to the inter-individual differences of the latent group. As a result of the analysis, fire safety awareness of high school students was classified into three latent profiles. The three groups were named 'High Perception Type', 'Moderate Perception Type', and 'Low Perception Type' according to their types. In fire safety awareness, there is a significant difference in the individual differences according to the gender and academic achievement of the latent profile. These results are meaningful as the first study to analyze the latent profile of high school students' fire safety awareness, and it is also meaningful to provide a useful basis for the contents and methods of customized fire safety education by identifying the tendencies of spontaneous groups and their fire safety awareness.

• International Journal of Internet, Broadcasting and Communication
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• v.14 no.2
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• pp.171-182
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• 2022

In this study, by classifying latent groups for disaster safety awareness focusing on the four sub-factors of the developed disaster awareness scale of high school students, the characteristics of each group were examined, and the differences between latent classes according to inter-individual differences were investigated. As a result of analysis based on the data of a total of 1054 high school students, the disaster safety awareness of high school students was classified into three latent groups. Each latent group was named 'High Safety Awareness Type(SAT)', 'Normal SAT', and 'Low SAT' according to its characteristics. In all four fire safety awareness sub-factors, 'High SAT', which had a high score, accounted for 56.5% of the total, and 'Normal SAT', which had a moderate score in the sub-factors, had the lowest ratio at 20.3%. There were no significant differences by gender, grade, and academic achievement of the latent group. These results are not only meaningful as the first study of the latent profile analysis of high school students on disaster safety awareness, but also help to identify the characteristics of individuals in each latent group with more subdivisions and provide useful data for disaster safety awareness education according to individual differences. The implications of this study and suggestions for follow-up studies were discussed.

• Journal of the Korean Society of Environmental Restoration Technology
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• v.4 no.3
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• pp.38-48
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• 2001

A wetland is an ecosystem which is the most useful and highly-energetic transition area. This study has been carried out to develop the wetland function assessment methods and apply on the natural wetlands (Mul-young-ari wetland in Jeju-island and Bangdong wetland in Taejon Metropolitan city) using RAM (Rapid Assessment Method). The RAM is useful method for assessing the wetland functions in terms of general functions acquired by once or twice onsite surveying. Eight functions of 2-12 variables each are analyzed for assessing the wetland functions. The results are as follows : 1) The conservation values of two wetlands are "High". 2) In Mul-young-ari wetland, such functions as groundwater discharge, floral diversity and wildlife habitat, shoreline/stream bank protection are relatively high, but some functions such as flood/storm water storage, aesthetics and recreation are "Moderate" - "High". 3) In Bangdong wetland, such functions as floral diversity and wildlife habitat, groundwater discharge, flood/storm water storage, aesthetics and recreation are high, and another functions are "Moderate" - "High". The taxonomy of this study stems from assessing functions of inland wetlands using indices of RAM. So It is needed that consequent studies are to be performed with verifying the variables and indices.

• Journal of Korean Academy of Nursing
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• v.42 no.6
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• pp.833-842
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• 2012

Purpose: The purpose of this study was to evaluate the effectiveness of spiritual intervention studies by examining biological, psychological, and spiritual outcomes. Methods: From electronic databases 2522 studies were retrieved, of which 21 studies met the inclusion criteria. These studies had 1411 participants. Two authors independently extracted data from the selected studies and assessed the methodological quality. The data were analyzed using the RevMan 5.1 program of the Cochrane library. Results: Overall effect size of spiritual intervention on spiritual and psychological (depression and anxiety) outcomes were moderate (d= -0.65 to d= -0.76, p<.001). The effects on biological outcomes (pain and functional status) ranged from -0.51 to -0.39, respectively. No publication bias was detected as evaluated by a funnel plot. Spiritual intervention had a moderate effect on psychological and spiritual outcomes and a smaller effect on biological outcomes. Conclusion: The results of this study suggest that spiritual intervention can relieve depression and anxiety. Further randomized controlled trials studies are needed to evaluate the effects of spiritual intervention on biological outcomes.

• Restorative Dentistry and Endodontics
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• v.21 no.1
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• pp.385-402
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• 1996

Cytotoxicity of dental restorative materials using cell culture technique has been extensively studied by various quantitative assays. The aim of this study was to investigate the microstructural change of damaged L292 cells which could not observed with light microscope. Cytotoxic effect of ZOE, Prisma APH (Densply International Inc., U.S.A.), Clearfil FII(Kuraray Co., Japan), Fuji II(GC Co., Japan) and Fuji II LC(GC Co., Japan) on cultured L292 cells were observed. Irreversible cell damage and cytolysis were found in ZOE and Fuji II groups. In Clearfil FII, mild to moderate cell damage was observed. APH group showed variable cytotoxicity. Moderate cell damage was found in Fuji II LC group. Cytotoxic effect were as follows : A condensation of the chromatin occureds along or adjacent to the inner membrane of the nuclear envelops. The nuclear envelope remained resonably intact but the contents were partially or completely lost. The cell nucleus contains clusters of markedly electron-dense interchromatin granules. The rough endoplasmic reticulum were dilated. In some mitochondira, matrix was disoriented and fused cristae were discernible. Mitochondiral swelling and woolly appearance were recognized. Large vacuoles and autolysosmes were found in cytoplasm. Some breaks of the cytoplasmic membrane and even cytolysis could be seen in dying cells.