• Proceedings of the Korean Ceranic Society Conference
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• 2003.04a
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• pp.62.1-62
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• 2003

• Proceedings of the Korean Ceranic Society Conference
• /
• 2003.04a
• /
• pp.131.1-131
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• 2003

• Proceedings of the Korean Society of Dyers and Finishers Conference
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• 2009.03a
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• pp.140-141
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• 2009

• Proceedings of the Korean Ceranic Society Conference
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• 2000.10a
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• pp.57.1-57
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• 2000

• Macromolecular Research
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• v.16 no.1
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• pp.76-80
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• 2008

• Proceedings of the Korean Ceranic Society Conference
• /
• 2003.10a
• /
• pp.70.1-70
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• 2003

• Bulletin of the Korean Mathematical Society
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• v.36 no.2
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• pp.403-409
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• 1999

In this paper we introduce the notions of expansive homeomorphism and its properties, and study the relation between countable compacta and ordinal numbers. Our results extend and improve those of T.Kimura and others.

• Proceedings of the Korean Institute of Surface Engineering Conference
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• 2012.05a
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• pp.327-327
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• 2012

Si 함량이 증가할 수록 산화Scale에 Si 산화물층이 응집하여 전체적인 산세 속도를 저하시키는 경향이 있는 것을 알려져있다. 본 연구에서는 Si 함량에 따라서 산화물 산세 거동을 실험적을 파악하고자 하였다.

• Journal of Adhesion and Interface
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• v.21 no.1
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• pp.27-33
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• 2020

Adhesion property of epoxy adhesive was evaluated with different surface roughness of glass fiber reinforced composite (GFRC) and optimized condition of surface roughness was confirmed. Different sizes of alumina (Al2O3) particles were blasted to GFRC to control surface roughness of GFRC using sand blasting method. The surface roughness was measured and quantified via surface roughness tester. Contact angle was measured using four types of different solvents. Surface energies and work of adhesion between epoxy adhesive and GFRCs were calculated with different surface roughness of GFRC. Adhesion property between epoxy adhesive and GFRCs was evaluated using single lap shear test and adhesion property increased with surface roughness of GFRC. The fracture surface of GFRCs was observed to evaluate adhesion property. Finally, the optimized roughness condition of GFRCs was confirmed.

• 연구논문집
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• s.30
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• pp.137-145
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• 2000

Since the concept of osseointegration was introduced, titanium and titanium-based alloy materials have been increasingly used for bone-anchored metal in oralmaxillofacial and orthopedic reconstruction. Successful osseointegration has been attributed to biocompatibility and surface condition of metal implant among other factors. Although titanium and titanium alloys have an excellent over the metal ion release and biocompatibility, considerable controversy has developed over the metal ion and wear debris in vivo and vitro. In this study, nitrogen ion implantation technique was used to improve the corrosion resistance and wear property of titanium materials, ultimately to enhance the tissue reaction to titanium implants As ion implantation energy was increased, projected range of nitrogen ion the Ti substrate was gradually increased. Under condition of constant ion energy. atomic concentration of nitrogen was also increased with ion doses. The friction in Hank's solution was increased with ion doses. The friction coefficient of ion implanted specimens in HanK's solution was increased from 0.39, 0.47 to 0.52, 0.65 respectively under high energy and ion dose conditions. As increasing ion energies and ion dose, amount of wear was reduced.