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문학룡,배정렬,한천구 청주대학교 산업과학연구소 2003 産業科學硏究 Vol.21 No.1
This study discusses the influence of fineness of cement on the properties of cement mortar. According to the results, compressive strength shows a higher value in order of high early cement with 8000㎠/g of fineness(C), 4600㎠/g of fineness(B), 3000㎠/g of fineness(A) and ordinary cement(OPC) at mixture proportion of 1:3, and it does in order of C, B, OPC and A at mixture proportion of 1:1. Compressive strength shows a higher value in order of exposure at outside, standard and air curing with variation of curing condition. Flexural strength shows the similar tendency with compressive strength, and is about 1/7∼1/6 in comparison with compressive strength. And, its correlativity is above 0.93, so it is very favorable. Length change by drying shrinkage is higher in order of C, B, OPC and A at mixture proportion of 1:1 and 1:3.
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팽창재 및 수축저감제 사용에 따른 고성능 콘크리트의 특성
문학룡,황인성,한천구 청주대학교 산업과학연구소 2004 産業科學硏究 Vol.21 No.2
This study is investigate the fundamental and shrinkage properties of high performance concrete of W/B 30% with using expansive additive and shrinkage reducing agent. According to the results, it is considered that fluidity and air content are hardly influenced and strength development well by using expansive additive and shrinkage reducing agent. As for the shrinkage properties, it shows the best efficient to reduce autogenous and drying shrinkage when combined use of expansive additive and shrinkage reducing agent which have different shrinkage reducing concept. There for, combined use of expansive additive and shrinkage reducing agent is efficient to reduce shrinkage in high performance concrete of W/B 30%.
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도로 기하구조에 따른 차량 Microphone 위치별 소음 영향 분석
문학룡,한대철,강원평 한국도로학회 2013 한국도로학회논문집 Vol.15 No.4
PURPOSES: The purpose of study is to understand the characteristic of driving noise from the front and rear tire for effective active noise cancellation application. METHODS : As literature review, noise measurement methods were reviewed. Noise measurement conducted at three kind of section by road slope using CPX(Close Proximity Method). Noise data was compared by total sound pressure level and 1/3 octave band frequency sound pressure level. Also, each section was compared by T-test using SPSS. RESULTS : In the case of the uphill section, it was shown that the sound pressure level of the front tire at Sugwang-Ri and Sinchon-RI sections was higher than that of the rear tire in low and high frequency band. In the case of high slope section of Sangsaek-Ri, the sound pressure level of the front tire was higher than that of the rear tire in high frequency. Also, in the case of the downhill section, it was shown that the sound pressure level of the front tire at Sugwang-Ri and Sinchon-RI sections was higher than that of the rear tire in low frequency band. However, the sound pressure levels of both the front and rear tires were approximately the same in the high slope section of Sangsaek-Ri. The result of T-test showed that total sound pressures of the front and rear tires were not different from each other in the case of high slope and high speed. CONCLUSIONS: Road slope was not an important variable for effective active noise cancellation.
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