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김문상,김노수,김상용,Kim, Mun-Sang,Kim, No-Su,Kim, Sang-Yong 한국섬유공학회 1966 한국섬유공학회지 Vol.3 No.2
Studies were carried out on shrinkage of cotton rib knit fabrics and the following results were obtained: Wale shrinkages increase abruptly in (+) direction and course shrinkages in (-) direction beyond a certain c.p.i. limit. Effects of the immersion time and temperature to shrinkages are random and negligible. Bleaching increases considerably the shrinkages of rib knit fabrics. Area shrinkages increase linearly with c.p.i and the more complex the constructions are, the larger the increasing ratios. Increasing ratios of area shrinkage of bleached are larder than the scoured and immersed.
김문상,조경래,박강,신현오,Kim, Mun-Sang,Cho, Kyung-Rae,Park, Kang,Shin, Hyun-Oh 대한기계학회 1996 大韓機械學會論文集A Vol.20 No.8
Inspecting the dimensional accuracy of a car-body in assembly line is a very important process to assure high productivity. Now there exist two common inspecting methods in practice. One is to measure a sampled car-body with three dimensional measuring machine, and the other is to measure car-body with three dimensional measuring machine, and the other is to measure car-body in assembly line using many sensors fixed to a large jig frame. The formal method takes too long to inspect a sampled car-body of a same sort, and cannot therefore give an useful error trend for the whole production. On the other hand, the latter lacks flexibility and is very cost-intensive. By using industrial robots and sensors, an in-line Car-Body Measuring(CBM) system which ensured high flexiblity and sufficient accuracy was developed. This CBM cell operates in real production line and measures the check points by the non-contact type using camera and laser displacement sensor(LDS). This system can handle about 15 Measuring points within a cycle time of 40 seconds. A process computer controls whole process such as data acquisition file handling and data analysis. Robot arms changes in length due to ambient temperature fluctuation affecting the measuring accuracy. To compensate this error, a robot arm calibration process was developed.