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김형준,최성철 한국세라믹학회 1999 한국세라믹학회지 Vol.36 No.8
This study suggests the accurate method to calculate dominant wavelength and excitation purity which are used for analyzing color of glass product. Instead of ruler and magnified chromatricity diagram by using the slope of lines by tristimulus measured and achromatic timulus and by monochromatiic stimulus and achromatic stimulus calculating method of dominant wavelength and excitation purity was acquired with the relation between them. When it was applied to products the obtained results were more accurate than those from existing methods. 본 연구는 유리 제품 색조 분석시 일반적으로 사용되는 주파장과 순도의 계산에 있어서 정확한 결과를 얻을 수 있는 방법을 제시하고자 하였다. 기존에 계산에 사용해 왔던 자와 확대된 색도 좌표도에 의한 방법 대신, 측정한 색도 좌표값이 무채색 자극치와 만드는 직선의 기울기와 단색광 자극치와 무채색 자극치가 나타내는 직선의 기울기 간의 상관관계를 이용하여 주파장 및 순도의 계산방법을 찾았다. 이를 실제 제품에 적용하였을 때, 기존 방법 보다 정확한 결과를 얻었다.
도로교 보강용 쐐기형 정착시스템의 거동해석에 적용 가능한 복합재료 파괴이론의 적합성에 대한 연구
김형준 한국도로학회 2023 한국도로학회논문집 Vol.25 No.6
PURPOSES : The wedge-type anchorage system requires a complex analysis of not only the tensile stress of the CFRP plate, but also the compressive stress and shear stress generated by the wedge action. The purpose of this study is to find a composite material failure theory that is suitable for analyzing the behavior of wedge-type anchorage system among various failure theories. METHODS : In this study, numerical analysis of various composite material failure theories was performed to analyze the anchorage strength and failure mode of the wedge-type anchorage system according to each failure theory, and compared with actual test results to determine the composite material failure theory most suitable for analyzing the behavior of a wedge-type anchorage system. RESULTS : Since the Maximum Stress failure theory shows similar results to the actual test in terms of failure mode and anchorage strength, there is no significant problem in applying it to the wedge-type anchorage system. However, it is judged to be difficult to apply under property conditions where interactions between stresses are highlighted. The Tsai-Hill and Tsai-Wu failure theories are considered unsuitable for application to wedge-type anchorage systems because the wedge angle conditions at which the most advantageous anchorage strength occurs are significantly different from other theories and the fracture type cannot be predicted. The Hashin-Rotem failure theory is considered to be the most appropriate to apply as a failure theory for the wedge-shaped anchorage system because the anchorage strength was slightly lower than the actual test results, but there was no significant difference, and the failure mode was consistent with the test results. The Hashin failure theory is judged to be unsuitable for application as a failure theory for the wedge-type anchorage system because the anchorage strength and failure mode were interpreted differently from the actual test results. CONCLUSIONS : The Hashin-Rotem failure theory was presented as the composite material failure theory most suitable for analyzing the behavior of wedge-type anchorage system.
감광성 결정화유리를 이용한 미세 구조물 제조에 대한 연구
김형준,이상훈,연석주,최성철 한국세라믹학회 2000 한국세라믹학회지 Vol.37 No.1
In lithium silicate photosensitive glass-ceramics, the relationship between lithography time and crystallization, and the effect of addition of mineral acid in etching rate and pattern shape were investigated. Irradiation times for micropatterning were less than 5 minutes in which Ce3+ ions in glass were changed rapidly to Ce4+ with ultra violet light. Overexposure to ultra brought about blot of pattern by diffiraction of light. Addition of mineral acid to HF enhanced etching rate as compared with HF solution only. The addition of H2SO4 especially increased the etching rate by 70%. But the mixed solution also increased the etching rate of the noncrystallized portion of the glass and this resulted in heavy etching. Etching with ultrasonic wave showed higher etching rate than that with the static or fluid method.