• Journal of Dental Rehabilitation and Applied Science
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• v.32 no.1
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• pp.24-31
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• 2016

Purpose: Many studies have shown that airborne-particle abrasion of fiber post can improve the bonding strength to resin cement. But, airborne-particle abrasion may influence the property of fiber post. The purpose of this study is to evaluate the influence of airborne-particle abrasion on flexural strength of fiber post. Materials and Methods: Two fiber-reinforced posts; DT Light Post Size 2 (1.8 mm diameter, Bisco Inc) and RelyX Fiber Post Size 3 (1.9 mm diameter, 3M ESPE); were used in this study. Each group was divided into 3 subgroups according to different surface treatments; without pretreatment: $50{\mu}m$ aluminum oxide (Cobra$^{(R)}$, Renfert): and $30{\mu}m$ aluminum oxide modified with silica (Rocatec Soft$^{(R)}$, 3M ESPE). After airborne-particle abrasion procedure, three-point bending test was done to determine the flexural strength and flexural modulus. The diameter of each posts was measured to an accuracy of 0.01 mm using a digital micrometer. There was no diameter change before and after airborneparticle abrasion. The mean flexural moduli and flexural strengths calculated using the appropriate equations. The results were statistically analyzed using One-way ANOVA and Scheffe's post-hoc test at 95% confidencial level. Results: There was no significant difference on flexural strength between groups. Conclusion: In the limitation of this study, flexural strength and flexural modulus of fiber post are not affected by airborne-particle abrasion.

• Knowledge Management Research
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• v.21 no.3
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• pp.177-195
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• 2020

The social consciousness on fake reviews has triggered researchers to suggest ways to cope with them by analyzing contents of fake reviews or finding ways to discover them by means of structural characteristics of them. This research tried to collect data from blog posts in Naver and detect habitual patterns users use unconsciously by variables extracted from blogs and blog posts by a machine learning model and wanted to use the technique in predicting fake reviews. Data analysis showed that there was a very high relationship between the number of all the posts registered in the blog of the writer of the related writing and the date when it was registered. And, it was found that, as model to detect advertising reviews, Random Forest is the most suitable. If a review is predicted to be an advertising one by the model suggested in this research, it is very likely that it is fake review, and that it violates the guidelines on investigation into markings and advertising regarding recommendation and guarantee in the Law of Marking and Advertising. The fact that, instead of using analysis of morphemes in contents of writings, this research adopts behavior analysis of the writer, and, based on such an approach, collects characteristic data of blogs and blog posts not by manual works, but by automated system, and discerns whether a certain writing is advertising or not is expected to have positive effects on improving efficiency and effectiveness in detecting fake reviews.

• Trans-
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• v.1
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• pp.1-19
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• 2016

Arts have changed continuously reflecting the times with the political atmosphere and social systems. As political, economic, and social big changes have occurred since World War II, antihistorical tendencies rejecting modernism in the early 20th century have come to appear in culture and arts as well. With these social changes, radical, avant-garde and artistic tendencies with strong experimental spirits, which rejected modernism took place especially in American dancing world. Trends of improvised elements and experimental trials were dominated discovering expressions of new movements in intentions and expressions of works. The purpose of this study is to investigate the effects on choreographic forms of modern dance until today by exploring choreographic characteristics of this postmodernism. To examine post-modernist inclinations in works, Trisha Brown who led American post-modern dance stressed dance for expressions of movements in themselves and pure movements by actively accepting into dance works American social flows which played a major role in postmodernism starting from 1960s. American modern dancers considered body in itself as important one and any emotional expressions and individual sensitivity is excluded as their physical expressions are factual, realistic, and due to their movements. They imprinted dance as valuable art by recreating ordinary behaviors into dance, using space excellently and forming experimental dance shapes. Therefore, it can be said that through analyzing brown's works, we proposed a new direction getting out of limits of arts and provided a direction of essential dance alt to movements of modern dance and choreographic shapes.

• Restorative Dentistry and Endodontics
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• v.34 no.2
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• pp.103-112
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• 2009

The purpose of this study was to compare the effect of curing methods of adhesive resins and resin cements in the root canal. Crown portions of 32 single-rooted mandibular premolars were removed. Routine endodontic treatment was done, and 9 mm deep post spaces were prepared within root canals. No.3 FRC Postec posts (Ivoclar-Vivadent AG, Liechtensteih) were cemented in the post spaces by self-(SC) or light-curing (LC) using two dual-cured adhesives (Adper Scotchbond multi-purpose plus and Exite DSC )and resin cements (RelyX ARC and Variolink II). They were assigned to 4 groups (n=8): R-SC, R-LC, V-SC, V-LC group. After stored in distilled water for 24 hours, each root was transversally sectioned with 1.5 mm thick and made three slices. The specimens were subjected to push-out test in a universal testing machine (EZ Test, Shimadzu Co., Japan) with a crosshead speed of 1 mm/min. The data were analyzed with repeated ANOVA and one-way ANOVA. Also the interface of post-resin cement and resin cement-canal wall of each group was observed under FE-SEM. When fiber posts were cemented into the root canal using total-etch adhesives, the bond strength and adaptation between post and root canal dentin was affected by curing method. Self-cure of adhesives and resin cements showed higher bond strength and closer adaptation than light-cure of them.

• Restorative Dentistry and Endodontics
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• v.35 no.6
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• pp.479-485
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• 2010

Objectives: The aim of this study was to compare the push-out bond strengths of resin cement/fiber post systems to post space dentin using different application methods of resin cement. Materials and Methods: Thirty extracted human premolars were selected and randomly divided into 3 groups according to the technique used to place the cement into root canal: using lentulo-spiral instrument (group Lentulo), applying the cement onto the post surface (group Direct), and injecting the material using a specific elongation tip (group Elongation tip). After shaping and filling of the root canal, post space was drilled using Rely-X post drill. Rely-X fiber post was seated using Rely-X Unicem and resin cement was light polymerized. The root specimens were embedded in an acrylic resin and the specimens were sectioned perpendicularly to the long axis using a low-speed saw. Three slices per each root containing cross-sections of coronal, middle and apical part of the bonded fiber posts were obtained by sectioning. The push-out bond strength was measured using Universal Testing Machine. Specimens after bond failure were examined using operating microscope to evaluate the failure modes. Results: Push-out bond strengths were statistically influenced by the root regions. Group using the elongation tip showed significantly higher bond strength than other ways. Most failures occurred at the cement/dentin interface or in a mixed mode. Conclusions: The use of an elongation tip seems to reduce the number of imperfections within the selfadhesive cement interface compared to the techniques such as direct applying with the post and lentulospiral technique.

• Journal of Christian Education in Korea
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• v.70
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• pp.11-35
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• 2022

The purpose of this article is to suggest nine types of educational ministry based on the practical theology in Christian Education. For the purpose this article emphasizes an individual dimension including church, society dimensions. An individual dimension is based on the spirit of post digital era within sociocultural area in different with personal-existential area of the philosophical and theological perspective and life cycle theology area of the developmental psychological perspective. Post digital era means the humanization of digital, digital friendly, and emotional digital cultural characteristics. Post digital generation means child, youth, young adults those who are accustomed with post digital cultural of the post digital era. The educational ministry for the post digital generations categorized into nine types according to correlation with individual, church, and society as a field of ministry and critical scientific method, critical confessional method, and critical correlational method as an interdisciplinary which are composed of Christian tradition and contemporary science. Representative key competencies of nine types in the educational ministry are media literacy, relational identity, communication, high touch, discipleship, making and using media, integrative vocation, collaboration abilities, and home, school, and social resilience in relation with multicultural generations.

• The Journal of the Korea Contents Association
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• v.14 no.1
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• pp.158-164
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• 2014

This study has been started by the trendy analysis of parody in post-modern dance. Creative parody is not an imitative work but provides new originality of a work of art and serves as the criticism. Since the 1960s the trend and characteristics of using parody in post-modern dance can be classified into five concepts which are the cultural diversity, the autonomous thinking ability, the aesthetic perception, the use of the mass media and the cultural relations of the critical process. In conclusion, the parody elements in post-modern dance are due to the cultural diversity, and the experimental values which are divided into the beauty of content and mode has been acted as the important factors to achieve the parody elements to new dimension.

• The Journal of the Korea Contents Association
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• v.16 no.3
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• pp.162-170
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• 2016

Xavier Dolan delves into maternal instinct and sexual identity and the attempt and experiment of his movies are not difficult to understand and not unfamiliar. He communicates with audience through pastiche and self-reflexivity, rather than disassembling and destruction of style and form of existing films. Pastiche is the intertextuality between familiar genres such as film, poem, fashion, music, painting, etc. His films shows the characteristics of postmodernism, which include genre over, de-subjectivity, interest in public culture, and representation of nostalgia. This study recognizes anew the present of postmodernism gradually going out of fashion and analyzes the characteristics of postmodernism and repeated motif in his movies. This study also analyzes Xavier Dolan's interest in social minority and allegorian characteristics through characters appearing in his movies.

• The Journal of Natural Sciences
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• v.8 no.2
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• pp.199-224
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• 1996

The value orientations and life styles which are characterized by the postmodern societies have been expanding in korean society. This paper concerns with the postmodernism for in fashion design : at first the complex relationships between the logic of post-industrial society and the culture dynamics of postmodernism will be explained. Then the characteristics of postmodernism in the comparision with the Bauhaus, also "modernism" in design areas will be critically identified, and significant examples which I select in order to criticize the basic elements or orientations of postmodern design will be analized in details.I will make a new perspective which is beyond Bauhaus and postmodernism ; namly 'open dialogism design.'. But in the boundary of its introduction.

• Journal of Korea Game Society
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• v.19 no.2
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• pp.83-94
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• 2019

This paper analyzed the posthuman features of the open-world adventure game. These games represent the player character as Posthuman Subject through the restrictions of information and body. The player explores all of the spaces to perform the quests due to nonlinearity of open-world. The interactions are restricted conflicts and it reveals through gameplay. The experiences as Posthuman Subject allow the player to embody the Hybrid Subjectivity and think about coexistence of human and inhuman.