With this research I will suggest improving the way a mask fits can benefit sufferers of hay fever. The masks that are readily available on the market for hay fever, absorbed a lot of pollen during experiments. However, the effects while wearing are unclear. Accordingly, I became interested in the fit of masks to faces. In order to evaluate the fit abilities of a mask to a face quantitatively, a device, which measures the strain behavior of a face and a gauze sheet at the time of mask wearing, has been developed. In order to investigate fit abilities, the angle change and position change at the time of vowel pronunciation “A”, “E”, “I”, “O”, and “U”, were measured using the device composed of two shape sensors and a digital video camera. There were 5 measurement points on both the mask and face. The measurement points were as follows: two points “nc”and “ns”in the nose; one point “cc”in the cheek and two points “jc”, “js”in the jaw. The first characters “n”, “c”, and “j”mean nose, cheek and jaw. The second characters “c”and “s”means center and side. Three kinds of 2-D gauze mask of different sizes were adopted as the experiment sample. The subjects were nine young women. These measurements bring a lot of value data; therefore, they make it difficult for me to consider the situation of differing vowel pronunciation. Hence, two data analysis programs, one for angle changes and one for position changes were developed. This was in order to comprehend the differing vowel pronunciations with the help of Visual Basic for Application. I studied the fit abilities from viewpoints of angular differences and correlations coefficients between a mask and a face, and then the measured distances of a mask to a face. As a result of analyzing the angle changes, the maximum angular differences of the large size mask showed significant differences compared with other size masks. This result means that the L size mask didn't fit well for the subjects in this experiment. In addition, the measurement points of “jc”and “js”in jaw and “ns”in noses implied poor fit abilities in all samples. As a result of the analyzed position changes using the maximum distances, the data didn't show significant difference in fit ability among samples. Furthermore, measurements of the points “jc”and “js”in the jaw at the time of vowel pronunciation “A”, “O”, and “E”indicated poor fit abilities in vertical directions for all samples.
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