• Communications for Statistical Applications and Methods
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• v.3 no.3
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• pp.303-310
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• 1996

1987년도와 1992년도에 한국 갤럽에서 대통령 선거 결과를 예측하기 위하여 실시한 바 있는 여론 조사 결과를 그래픽으로 분석하였다. 1987년도에는 각 후보에 대한 직접적인 지지도보다 종교별 후보 지지도 예측에 발표의 촛점이 맞춰져 있었으므로 이 발표 결과를 다각적으로 분석하였고, 1992년도에는 각 후보의 직접적인 지지도 분석에 촛점을 두었다.

• Proceedings of the Korean Operations and Management Science Society Conference
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• 1995.09a
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• pp.280-292
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• 1995

경영혁신을 시도하지 않고 있는 기업들은 없다고 할 정도로 많은 기업들이 경영혁신에 관심을 갖고 있다. 대부분의 기업들은 경영혁신의 대상으로 주로 원가 절감에 촛점을 맞추고 있으나 매출액의 증대에 촛점을 맞추어야 더 큰 효과를 창출할 수 있다.

• Journal of the korean academy of Pediatric Dentistry
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• v.30 no.1
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• pp.153-160
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• 2003

The purpose of study was to evaluate the effects of the $CO_2$ laser irradiation on demineralization inhibition and rehardening of human primary tooth enamel by laser fluoresecence measurement. Enamel specimens were made from the human primary teeth. The center spots of the specimens about 2 mm diameter were irradiated by $CO_2$ laser at the conditions of focused continuous or defocused pulsed, 3 or 6 W, for 4 seconds, before or after the demineralization by Coca-Cola for 24 hours at $37^{\circ}C$. The Diagnodent was used to measure the degree of demineralization and rehardening. There was no significant difference between focused continuous and defocused pulsed irradiation. 6W irradiation inhibited the demineralization but 3W did not. 6W irradiation rehardened the demineralized enamel but 3W did partially. The color of enamel was changed to brown to black after 6W irradiation but 3W caused no color change. $CO_2$ laser irradiation showed the effects on demineralization inhibition and rehardening of human priamary tooth enamel, and the laser fluoresecence measurement technique seemed to be a valid evaluation method.

• Journal of the korean academy of Pediatric Dentistry
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• v.28 no.3
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• pp.374-382
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• 2001

The purpose of this study was to investigate the surface morphology and measure shear bond strength of Er : YAG lased enamel. To determine the most effective energy density of laser for improving bonding strength of human enamel, 24 specimen were lased from 30mJ to 150mJ at 1Hz used focused, defocused beam. After irradiation, the lased specimen were observed scanning electron microscope. To determine the resin shear bond strength of Er : YAG lased enamel, the 90 specimen were divided into 3 groups. The Control group was etched with 37% phosphoric acid for 15seconds and rinsed. Group 1 was only laser irradiaton(60mJ, 10Hz), Group 2 was irradiated as Group 1 regimen, followed 37% phosphoric acid etching. The following results were obtained: 1. In both focused and defocused Er : YAG lased enamel surface are similar to acid-etched enamel more than 60mJ in SEM evaluation. 2. The more increased laser energy, the more observed fissuring surface. 3. The highest mean shear bond strength value was observed in control group with the statistical significance(p<0.05) between all the other groups and the shear bond strength in group 1 was the lowest with significant difference among the other groups.

• Proceedings of the Korean Society of Precision Engineering Conference
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• 1995.04a
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• pp.520-524
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• 1995

오늘날 기업이 당면하고 있는 과제는 제품수명이 단축되고, 제품의 종류가 다양화 되면서 단위 제품량이 줄고, 노사분규, 임금인상, 작업환경개선의 요구등 제반문제가 대두되고, 시장성은 더욱 치열해지면서 소비자의 상품에 대한 요구사항이 복잡해지는 경향이 뚜렷하다. 이에따른 생산방식은 얼마나 많은 양을 생산하는가에 촛점을 둔 규모의 경제개념에서 얼마나 다양한 종류의 제품을 효율적으로 생산할 수 있는가에 촛점을 맞춘 범위 의 경제개념으로 전환된 다품종 소량생산체제로 변화하고 있다. 본 연구는 자동차용 Brake system의 Caliper 조립에 있어서 자동화 Line 개발에 성공하여 실용화하고 있는 Line에 대하여 기본적인 구상과 개발기술 및 실용화 결과에 대하여 고찰하였다.

• 건강소식
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• v.19 no.9 s.202
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• pp.3-3
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• 1995

• 건강소식
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• v.20 no.3 s.208
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• pp.3-3
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• 1996

• 건강소식
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• v.14 no.2 s.135
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• pp.11-11
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• 1990

• 건강소식
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• v.14 no.6 s.139
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• pp.8-8
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• 1990

• 건강소식
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• v.19 no.8 s.201
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• pp.3-3
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• 1995