• The magazine of the Korean Society for Advanced Composite Structures
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• v.5 no.4
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• pp.29-42
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• 2014

• The magazine of the Korean Society for Advanced Composite Structures
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• v.5 no.4
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• pp.12-15
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• 2014

• The magazine of the Korean Society for Advanced Composite Structures
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• v.4 no.4
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• pp.21-25
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• 2013

• The magazine of the Korean Society for Advanced Composite Structures
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• v.4 no.4
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• pp.31-39
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• 2013

• The magazine of the Korean Society for Advanced Composite Structures
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• v.1 no.2
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• pp.23-34
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• 2010

• Journal of the korean academy of Pediatric Dentistry
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• v.50 no.1
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• pp.113-120
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• 2023

Restoring composite resins with the optimal shades for all primary teeth is a great challenge for pediatric dentists. A newly developed single-shade composite resin can exhibit a color similar to that of the surrounding tooth structure based on the structural color phenomenon. This study aims to evaluate the color adjustment potential (CAP) of a single-shade composite resin compared to conventional multi-shade composite resins in primary teeth. A single-shade composite resin and two conventional multi-shade composite resins were included in this study. Two types of specimens, a single specimen and a dual specimen, were evaluated. For single specimens, duplications of the primary second molar denture teeth were made using experimental composite resins. For dual specimens, cavities were prepared on the buccal surfaces of extracted primary second molars and restored with experimental composite resins. The L^*, a^*, and b^* values were measured using a colorimeter for the extracted teeth and specimens. The mean ΔE_ab^* values for single and dual specimens and CAP were calculated. Bonferroni post-hoc analysis was performed to confirm the statistical significance between the ΔE_ab^* and CAP values of the experimental resins. Among the single specimens, the single-shade composite resin showed significantly higher ΔE_Single compared to other composite resins (p < 0.0167). There was no significant difference between ΔE_Dual for all experimental resins. The single-shade composite resin showed highest CAP compared to other multi-shade composite resins. A single-shade composite resin exhibited the most prominent color adaptability compared to other conventional multi-shade composite resins for primary second molars. A single-shade composite resin can simplify shade matching and provide esthetic outcomes for the restoration of primary second molars.

• The Journal of the Convergence on Culture Technology
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• v.9 no.1
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• pp.413-418
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• 2023

This study presents the direction of the Republic of Korea Army in the future by examining the Manned and Unmanned Teaming(MUMT) Systems of the Military Advanced Countries of the United States, Israel, and France. In this study, the current status of the U.S. Ground Forces' 'Squad-X' program, the Israeli Ground Forces' Digital Army Program (DAP), and the French Army's Scorpion program were examined. Next, it was followed by a discussion of The Combat concept, a way of fighting in the future battlefield, with the development trend of a complex Combat system with various weapon systems supporting it. Finally, based on this, the direction of the development of MUMT system, which the Republic of Korea Army should engage in in the future, was presented as a conclusion. Since such MUMT system of advanced military forces are being developed in a secret manner, continuous longitudinal research needs be conducted.

• Composites Research
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• v.36 no.5
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• pp.315-320
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• 2023

In the manufacturing process of thermosetting carbon fiber composite materials using an autoclave, the internal temperature changes according to the set temperature cycle. This temperature change causes the resin in the composite material to cure. Heat is generated through the chemical reaction of the resin, which can result in a difference between the temperature inside the autoclave and the temperature of the composite material. Previous research assumed that the temperatures of the composite material and the autoclave were the same and analyzed to predict the residual stress and thermal deformation after manufacturing. However, these stresses and deformations depend on the temperature and degree of cure of the composite material. Therefore, this study verifies a thermal-chemical model analysis technique that takes into account the heat generated by the chemical reaction of the resin to accurately calculate the temperature and degree of cure. Additionally, case studies were conducted for different thicknesses to investigate whether this model exhibits similar trends across varying thicknesses.

• Composites Research
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• v.20 no.1
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• pp.1-7
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• 2007

This study presents a methodology for optimization of static characteristics of golf club shafts. Stacking sequence for the optimal composite shaft performance is searched. A new objective function is defined for the simultaneous optimization of flexural and torsional stiffnesses. Classical lamination theory is used for the static analysis. As the optimization tool, genetic algorithm is applied with the stacking sequence as design. variables. With the optimal stacking sequence, dynamic characteristics of the shaft is also studied.

• Textile Coloration and Finishing
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• v.9 no.1
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• pp.50-60
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• 1997

최근섬유산업의 어려움은 국내 섬유산업이 시작된 이래 최대의 위기상황이라고까지 불리어지고 있다. 그러나 전자, 반도체산업의 불황국면의 예견은 전체 국가적인 차원에서 본다면 섬유산업의 재건을 꾀할 기회가 아닌가 보여진다. 이러한 상황에서 부가가치가 높은 제품개발만이 한국 섬유산업이 살아갈수 있는 방향이라는 것은 누구도 부인할 수 없는 현실이다. 최근 絲 생산업체에서는 모두 복합사의 생산에 모든 정보를 얻으려는 노력을 기울이고 있으며 기술개발에 노력을 경주하고 있다. 絲加工 공정을 포함한 제직준비 공정에서 부가가치가 높은 복합사 생산기술은 여러가지 방법이 있다. 본고에서는 인터레이스 노즐 종류별 絲 제품 개발 방향 및 Taslan 노즐과 이들 인터레이스 노즐을 이용한 특수 絲 개발 가능성 그리고 기타 여러가지 제직 준비시설을 이용한 특수 복합사 제조기술을 서술함으로써 중소기업 위주로 구성된 복합사 제조기업에 기초 기술자료를 제공하고자 한다.