• Proceedings of the Korean Ceranic Society Conference
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• 2000.04a
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• pp.70.1-70.1
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• 2000

• Proceedings of the Korean Ceranic Society Conference
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• 2003.04a
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• pp.28.1-28
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• 2003

• Proceedings of the Korean Ceranic Society Conference
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• 2003.04a
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• pp.61.2-61
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• 2003

• Proceedings of the Materials Research Society of Korea Conference
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• 2001.11a
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• pp.133-133
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• 2001

• Proceedings of the Korean Powder Metallurgy Institute Conference
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• 2004.11a
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• pp.106-106
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• 2004

• Proceedings of the Korean Ceranic Society Conference
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• 2002.10a
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• pp.48.2-48
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• 2002

• Proceedings of the Materials Research Society of Korea Conference
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• 2002.11a
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• pp.174-174
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• 2002

• Journal of the Korean Ceramic Society
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• v.31 no.10
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• pp.1159-1168
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• 1994

We powders were synthesized from W powders in differnet particle sizes by Self-propagating High-temperature Synthesis process (SHS) using a chemical furnace. The effects of the mole ratio of chemical fuel content, pellet thickness and the mole ratio between carbon and tungsten (C/W Ratio) on synthesis were investigated with the tungsten powders have different particle size each other. Compositional and structural characterization of these powders was carried out by scanning electron microscope (SEM0 and x-ray diffractometer. Powder characterization was carried out by the measurement of particle size distribution with laser-particle size analyzer. The amounts of WC obtained by SHS process depend very much on the particle size of tungsten powder and heat contents given in a product, i.e. as the particle size of W powder is smaller, the amounts of WC produced increase. Also the more heat contents is given, the more amounts of WC increase. By optimizing the synthesis conditions, it is possible to fabricate WC powders which have little secondary phases (W2C, C).

• Journal of the Korean Ceramic Society
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• v.32 no.8
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• pp.865-872
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• 1995

Ultra-fine $\beta$-SiC powders were fabricated by self-propagating high temperature synthesis process (SHS) using microwave oven. The flexural strength, fracture toughness, and hardness of hot pressed sample at 200$0^{\circ}C$ for 60 min using synthesized SiC powders, which had 2 wt% of Al2O3 and 2.5 wt% of B4C content, showed 438 MPa, 4.15MPa.m1/2 and 28 GPa, respectively. The highest strength, fracture toughness, and hardness of composites containing 4wt% of Al2O3, which had highest relative density of 99.9%, showed 458 MPa, 4.6MPa.m1/2 and 36.2 GPa, respectively.

• Korean Journal of Health Education and Promotion
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• v.28 no.3
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• pp.1-15
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• 2011

Objectives: The purpose of this study was to investigate the effect of a child-parent secondhand smoke(SHS) prevention program(C-PSHSPP). Methods: The participants were parents whose children were attending daycare centers located in S city. The institutions were selected using two-stage cluster sampling and data were collected using a structured questionnaire. Descriptive statistics were performed using SPSS version 18.0. Results: Number of cigarettes smoked per day, rate of smoking when with child decreased significantly. Parental awareness on SHS and scores on changes of experiential process increased significantly. Conclusions: From these results, it is suggested that the C-PSHSPP has beneficial effects in decreasing parental daily smoking amount at the same time increasing parental awareness on SHS and importance of smoking cessation. Therefore, C-PSHSPP can be recommended as a SHS intervention program for preschool children.