• The Bulletin of The Korean Astronomical Society
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• v.39 no.2
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• pp.41.2-41.2
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• 2014

고립된 은하주위의 위은하들의 편향된 낙하 운동을 보인다. 이 편향성을 결정하는 요소는 속도가위장의 비등방성인데 속도가위장의 단축으로 위은하들의 낙하가 일어나는 관측적 증거를 제시하고 이 편향성을 측정하여 은하단과 은하의 동력학적 질량을 결정한 후 궁극적으로 중력 법칙을 검증한다.

• Journal of Korean Academy of Nursing
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• v.29 no.2
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• pp.371-382
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• 1999

Nurses are at the forefront of providing hands-on care to patients infected with HIV(Human Immunodeficiency Virus). Therefore, appropriate and sensible infection control precaution should be taken at all times. The purpose of this study is to find out nurse's loaming needs about HIV/AIDS ; and nurse's willingness to perform nursing care to HIV/AIDS patients ; and the degree of fellowing universal precautions in nursing care ; and the degree of knowledge of HIV/AIDS to provide information on the guide for the further continuing education. The respondents of this study were 280 nurses in a university hospital in Kwang-Ju city. Data were collected using a self-administered questionnaire and analyzed by using percentages, means, Pearson's correlation, t-test, ANOVA, Duncan's grouping. The findings were as follows ; 1. The mean age of the nurses was 28.9 years, and the mean duration of their clinical experience was 6.8 years. Majority of the nurses(83.9%) had no experience in taking care of the AIDS patients. 2. The content s nurse's need to learn were showed in order such as clinical manifestations, infection control, patient care, and the mode of transmission of HIV/AIDS. 3. Even though the nurses had quite low knowledge about HIV/AIDS(mean score was 12.2 from the total of 26), they are willing to take care of the AIDS patients (mean score was 39.5 from the total of 60), and the degree of following universal precaution was also not so bad (mean score was 40.8 from the total of 50). 4. Nurses who are over 35 years old and had informal education regarding HIV/AIDS better following universal precautions. Nurses who had over 12 years of clinical experiences have more willingness to perform nursing care to the AIDS patients. Nurses who had experiences in taking care of the AIDS patients were more knowledgeable about HIV/AIDS. These findings suggest that some strategies should be develope to increase the willingness to perform the nursing care to the AIDS patients. And also continuing education program should be develope and run for the clinical nurses so that they can provide effective and appropriate nursing care to the AIDS patients.

• Restorative Dentistry and Endodontics
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• v.40 no.4
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• pp.255-261
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• 2015

Objectives: The aim of this study was to evaluate the effect of three different drinks on the color parameters of four different restorative materials. Materials and Methods: Three different composites (Filtek Ultimate Universal Restorative, Filtek Ultimate Flowable, and Filtek Silorane, 3M ESPE) and a polyacid-modified composite resin material (Dyract XP, Dentsply DeTrey GmbH) were evaluated. Eighty-four disc-shaped specimens of 8 mm in diameter and 2 mm in thickness were prepared (n = 21 each). Color coordinates ($L^*a^*b^*$, ${\Delta}L^*$, ${\Delta}a^*$, ${\Delta}b^*$, and ${\Delta}E^*$) were measured using a $V{\dot{I}}TA$ Easyshade Compact ($V{\dot{I}}TA$ Zahnfabrik) after 24 hr of storage (baseline) and after 30 day of storage in three different beverages of black tea, Coca cola, or water (control) (n = 7). In each beverage, the specimens were stored three times a day, one hr each, for 30 day. The color changes (${\Delta}E$) were calculated and were analyzed by Kruskal-Wallis and Dunn multiple comparison test. Results: The color difference (${\Delta}E^*$) of the resin materials ranged between 1.31 and 15.28 after 30 day of immersion in the staining solutions. Dyract XP in Coca cola ($15.28{\pm}2.61$) and black tea ($12.22{\pm}2.73$) showed the highest mean ${\Delta}E^*$ value after 30 day, followed by Filtek Ultimate Universal Restorative ($5.99{\pm}1.25$) and Filtek Ultimate Flowable ($4.71{\pm}1.40$) in black tea (p < 0.05). Conclusions: The compomers displayed unacceptable color changes at the end of 30 day in all beverages. Among resin composites, the silorane based composite exhibited relatively good color stability than the others. Filtek Ultimate Universal Restorative and Filtek Flowable showed similar color changes in all beverages.

• Korean Journal of Construction Engineering and Management
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• v.16 no.5
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• pp.3-11
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• 2015

This paper aims to review and discuss a graph-based approach for the representation and analysis of building circulation using BIM models. To propose this approach, the authors survey diverse researches and developments which are related to building circulation issues such as circulation requirements in Korea Building Act, spatial network analysis, as well as BIM applications. As the basis of this paper, UCN (Universal Circulation Network) is the main reference of the research, and the major goal of this paper is to extend the coverage of UCN with additional features we examined in the survey. In this paper we restructured two major perspectives on top of UCN: 1) finding major factors of graph-based circulation analysis based on UCN and 2) restructuring the UCN approach and others for adjusting to Korean Building Act. As a result of the further studies in this paper, two major additions have demonstrated in the article: 1) the most remote point-based circulation representation, and 2) virtual space-based circulation analysis.

• Journal of Digital Convergence
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• v.18 no.2
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• pp.103-110
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• 2020

The fire incident of KT's Ahyun branch occurred last year indicates that hyper-connected society led by 5G technology would be a dystopia instead of a utopia unless seamless connection of 5G service is well secured. Looking backward on 1999, we could peacefully and happily greet the new millennium by making a great effort to prevent the millennium bugs(Y2K) from causing the catastrophe such as a shut-down of banking system. Likewise, we should make a great effort to keep 5G networks and 5G service continuously working without the disruption of even just a second, which would enable us to avoid facing any catastrophes caused by the disruption of 5G service. As a way to do so, it can be considered that 5G service is designated as universal service because it has the key features of public goods like telephone and high-speed internet services.

• The Journal of Korean Association of Computer Education
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• v.22 no.2
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• pp.51-66
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• 2019

The Korean ministry of education has adopted an educational policy about digital textbooks at K-12 schools since 2018, in order to provide students with individualized learning contents and activities. However, digital textbooks has been yet prepared and delivered for the students with disabilities in the inclusive education. This study aims to develop the guidelines on digital textbooks for students with disabilities applying universal design for learning, recognizing the requirements for the digital textbooks which can be utilized in the K-12 inclusive classrooms for diverse students. In this respect, guidelines on digital textbooks were developed based on previous studies and cases. The first draft of guidelines were reviewed with two rounds of the delphi methods with special teachers. In addition, scenarios were developed, representing the rich educational contexts with digital textbooks applying the guidelines in a practical way for students with 4 types of disabilities. This study can contribute to establishing educational policies and environments related to the digital textbook development and dissemination for students with disabilities.

• Korean Journal of Social Welfare Studies
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• v.41 no.3
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• pp.213-239
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• 2010

The purpose of this research is to explore the explanatory factors of preference for the universality of the welfare system at the time of expanding the welfare system. In particular, considering endogenous problem that may occur in the process of analyzing the causal relationship between subjective perception and preference for welfare policy, the 2SLS regression analysis using instrument variables was attempted in this research. The key findings of this research were as follow. First, the groups who are opposed to the welfare state expansion, for example high income earners, low risk group, and employer/self-employer, prefer the more universal welfare systems. Second, the negative perception of welfare policy and recipients, which is stronger in older generation who experienced a much longer period of industrializaion, have a negative effect on preference for the universal welfare system. Last, we find that the endogenous problem arise in this research and distort the estimated regression coefficients. Therefore, subsequent studies must be mindful of this problem when they explain attitudes with attitudes.

• Restorative Dentistry and Endodontics
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• v.47 no.2
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• pp.21.1-21.11
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• 2022

Objectives: This study aimed to investigate the bonding effects of cleaning protocols on dentin impregnated with endodontic sealer residues using ethanol (E) or xylol (X). The effects of dentin acid etching immediately (I) or 7 days (P) after cleaning were also evaluated. For bonding to dentin, universal adhesive (Scotchbond Universal; 3M ESPE) was used. The persistence of sealer residues, hybrid layer formation and microshear bond strength were the performed analysis. Materials and Methods: One hundred and twenty bovine dentin specimens were allocated into 4 groups (n = 10): G1 (E+I); G2 (X+I); G3 (E+P); and G4 (X+P). The persistence of sealer residues was evaluated by SEM. Confocal laser scanning microscopy images were taken to measure the formed hybrid layer using the Image J program. For microshear bond strength, 4 resin composite cylinders were placed over the dentin after the cleaning protocols. ANOVA followed by Tukey test and Kruskal-Wallis followed by Dunn test were used for parametric and non-parametric data, respectively (α = 5%). Results: G2 and G4 groups showed a lower persistence of residues (p < 0.05) and thicker hybrid layer than the other groups (p < 0.05). No bond strength differences among all groups were observed (p > 0.05). Conclusions: Dentin cleaning using xylol, regardless of the time-point of acid etching, provided lower persistence of residues over the surface and thicker hybrid layer. However, the bond strength of the universal adhesive system in etch-and-rinse strategy was not influenced by the cleaning protocols or time-point of acid etching.

• KSII Transactions on Internet and Information Systems (TIIS)
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• v.9 no.1
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• pp.1-19
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• 2015

With the recent popularity of smart terminals, the demand for high-data-rate transmission is growing rapidly, which brings a new challenge for the traditional cellular networks. Both device-to-device (D2D) communication and small cells are effective to improve the transmission efficiency of local communication. In this paper, we apply D2D communication into a small cell network system (SNets) and study about the optimization problem of resource allocation for D2D communication. The optimization problem includes system scheduling and resource allocation, which is exponentially complex and the optimal solution is infeasible to achieve. Therefore, in this paper, the optimization problem is decomposed into several smaller problems and a hierarchical scheme is proposed to obtain the solution. The proposed hierarchical scheme consists of three steps: D2D communication groups formation, the estimation of sub-channels needed by each D2D communication group and specific resource allocation. From numerical simulation results, we find that the proposed resource allocation scheme is effective in improving the spectral efficiency and reducing the outage probability of D2D communication.

• Journal of Dental Rehabilitation and Applied Science
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• v.34 no.2
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• pp.72-79
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• 2018

Purpose: The purpose of this study was to compare flexural strength and elastic modulus of several splinting materials dependent on water absorption. Materials and Methods: Three different materials; LightFix, G-FIX, G-aenial Universal Flo; were used in this study. Thirty rectangular bar specimens ($25{\times}2{\times}2mm$) of each materials were prepared. Fifteen specimens of each materials were stored in 100% relative humidity atmosphere, $37^{\circ}C$ for 24 hours. The other specimens were stored in distilled water, $37^{\circ}C$ for 30 days. Flexural strength and elastic modulus were calculated using Universal testing machine. One-way ANOVA and Scheffe's post hoc test at 95% level of significance were used on all test results. Results: In LightFix, flexural strength and elastic modulus were significantly decreased after aging. In G-FIX, there was no significant change in flexural strength and elastic modulus after aging. In G-aenial Universal Flo, flexural strength was significantly decreased, but elastic modulus did not change significantly. Statistical analysis reveals that flexural strength and elastic modulus increased in the order of LightFix, G-FIX, G-aenial Flo in both 24 hours and 30 days. Conclusion: It could be deduced from this study that flexural strength and elastic modulus of some resins could be changed when it aged in oral environment. Thus this should be considered when choosing a resin to perform a resin-bonded splint.