• Proceedings of the Korean Society of Precision Engineering Conference
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• 2007.11a
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• pp.191-192
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• 2007

• Proceedings of the Korean Society of Precision Engineering Conference
• /
• 2012.10a
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• pp.145-146
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• 2012

• The Optical Journal
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• s.104
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• pp.36-38
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• 2006

약 20여년간 글라스 렌즈 연마쪽에서 많은 노하우를 가진 광학전문업체를 모체로 2003년 설립된 (주)나오텍(대표·김영기)은 각종 카메라에 사용되는 완제품 렌즈를 생산, 국내 및 해외 시장에 판매하고 있다. 후발주자지만 끊임없는 교육과 재투자, 신경영기법을 적용한 적극적인 마케팅 활동 등으로 인지도를 넓혀나가고 있으며 짧은 시간동안 급성장을 이루며 탄탄한 내실을 다지고 있다.

• Proceedings of the Korean Ceranic Society Conference
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• 2000.04a
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• pp.49.1-49.1
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• 2000

• Proceedings of the Korean Society of Precision Engineering Conference
• /
• 2009.06a
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• pp.743-744
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• 2009

• Proceedings of the Korean Society of Precision Engineering Conference
• /
• 2008.06a
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• pp.439-440
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• 2008

• Proceedings of the Korean Society of Precision Engineering Conference
• /
• 2007.06a
• /
• pp.257-258
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• 2007

• Proceedings of the Korean Society of Precision Engineering Conference
• /
• 2007.06a
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• pp.259-260
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• 2007

• Proceedings of the Korean Society of Precision Engineering Conference
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• 2000.11a
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• pp.850-853
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• 2000

It is well-known that Electro-rheological(ER) fluid is a material(suspension) which shows the dramatic change of rheological properties under an electric field. Using these properties, the concept that variable apparent viscosity of ER fluid could be applicable to the polishing for micro parts was introduced. It was investigated that how it works for polishing and how it affects ER effect when abrasives were mixed with an ER fluid. Therefore a few structures for polishing using ER fluid was suggested and evaluated by means of experiments. In this paper, fundamental mechanism and experimental results are described.

• Journal of Dental Rehabilitation and Applied Science
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• v.24 no.4
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• pp.325-335
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• 2008

The junction between resilient denture liner and the denture base is difficult to finish and polish due to difference of the physical property of the materials. Gaps tend to be formed during finishing and polishing procedures. The purpose of this study was measuring the width of junctional gap between $Molloplast-B^{(R)}$ and denture base material after finishing and polishing procedure, and evaluating the effect of method and direction on gap width. $Molloplast-B^{(R)}$ was processed (according to the manufacturer's instruction) against Lucitone $199^{(R)}$ acrylic resin. 50 specimens were fabricated with a raised center section. All of specimens were examined and photographed with a stereoscopic microscope(x120), and the largest gap along the junction of $Molloplast-B^{(R)}$ and acrylic resin on each specimen was measured. One-way analysis of variance(ANOVA) and independent t-test at 95% confidence level were used to analyze the data and to compare groups. The results of this study were as follows. In comparison with finishing tools, the gap width was the largest in $Molloplast^{(R)}$-Cutter and the smallest in FSQ-cross cut bur. There was statistically significant difference between FSQ-cross cut bur and $Molloplast^{(R)}$-Cutter(p<0.05). There was no significant difference in gap width between the direction of polishing. The mean value of gap width was the smallest in case of no polishing, and the largest in case of polishing with pumice & tin oxide. There was statistically significant difference between pumice and pumice & tin oxide. From the results, it is concluded that the use of $Molloplast^{(R)}$-Cutter in clinic need serious consideration even though it has good cutting ability. Further careful study is needed for finishing and polishing methods for decreasing gap width in junction of two materials.