Abstract:The purpose of this study is constructing the measuring method of indication performance on papers and electronic displays to quantitatively assess the visibility. We have developed novel photometric equipment: a charge-coupled device sensor that can measure the distribution of luminance. Various types of papers printed a sinusoidal wave pattern with predetermined spatial frequency and brightness contrast: contrast sensitivity chart have been assessed by human. Also, they have been measured and parameterized. The visibility evaluation model which predict the human assessment from photometric parameter has been built by means of multiple regression analysis. This model can be applied to electrophoretic electronic paper (e-paper). It is our expectation that the measuring method will be useful to develop new displays which contains good visibility.
Property of fabric appearance such as elegant, high-class, beautiful is required on producing dyed black color fabric for formal wear. From our previous study, the hierarchical model representing the quality check process of fabric appearance was proposed through evaluation of dyed black color fabrics by non-experts on textiles. And it was found that the evaluation of fabric appearance is strongly governed by that of macroscopic or microscopic brightness sensation. Hence, this study aimed to predict the score of the macroscopic or the microscopic brightness sensation by optical measurement and its characterization of dyed black color fabric. The spatial reflection curve on 12 kind of sample was measured with original gonio-photometric system. And several parameters (e.g. TI, S, and I) indicating the character of the spatial reflection curve was defined. Then the score of the macroscopic or the microscopic brightness sensation was predicted by equations which denoted with some of above parameters. Through these investigation, the methodology of photometry and characterization on brightness sensation of dyed black color fabric for objective assessment of fabric appearance was proposed.
In order to design and develop novel sock for soccer sports with good functionality, we investigated how to prevent the Impact slippage of sport sock. Five commercial sock for soccer sports was prepared. Based on the specification of commercial sock, five prototypes of sock were also prepared as samples. These samples differed in terms of the location of the inserted elastic yarn: the entire leg or the upper, middle, and lower areas. Then the impact slippage of sock was evaluated with own testing method for impact slippage of sock in dry and wet condition respectively. The clothing pressure with each sock in wearing at leg mannequin was also measured. In addition, the number of drops required to reach at 120 mm in distance of impact sock slippage was measured with leg guard which is required to use in regulation of soccer sports. From the result, it was found that the inserting elastic yarn into the leg part of sock provided the higher clothing pressure . The higher clothing pressure worked, the shorter distance of slippage occurred in wet condition. In addition, the sock inserting elastic yarn into the middle area of leg part was assessed efficiency to reduce the impact sock slippage with the leg guard. In other word, it is expected that an interference with the motion of the ankle by a slack will be reduced, because increasing the clothing pressure at the middle area of the leg part caused less slackness at the ankle part.
Most of previous researches on fabric texture have been focused on the aspect of fabric hand in comparison with that of fabric appearance. However in a few of previous researches mentioned an existence of multisensory interaction among the fabric hand and fabric appearance on the evaluation of fabric texture. Thus we have here attempted to conduct the evaluation of the fabric hand via the tactile system and that of the fabric appearance via visual system respectively. And clarified the commonality on these evaluation, in order to investigate the occurrence of the multisensory interaction, especially the occurrence of the acceleration or the inhibition affect. As a result, the high commonality was observed among these evaluation on feature of warmness and softness. But no commonality was observed on feature of roughness and moistness. In addition, the identification of triggering character which induced the evaluation on fabric hand or fabric appearance was investigated for feature of warmness, softness, roughness and moistness, respectively. Finally, it was considered that the multisensory interaction, especially the acceleration affect, is expected to occur among evaluation of fabric hand and fabric appearance on feature of warmness and softness. And the multisensory interaction, especially the inhibition affect, is also expected to occur on feature of roughness and moistness, respectively.
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