著者

西村 崇宏 平川 純 土井 幸輝 藤本 浩志

出版者

日本感性工学会

雑誌

日本感性工学会論文誌 (ISSN:18845258)

巻号頁・発行日

vol.19, no.2, pp.199-206, 2020 (Released:2020-04-30)

参考文献数

28

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This study aimed to evaluate the influence of the work posture due to palm rejection on the mental workload caused by handwriting using a stylus. We conducted an experiment, in which the work posture due to palm rejection and the screen tilt angle were evaluated using the input time and the NASA task load index. The results indicated that when the screen tilt angle was 0-30°, the mental workload could be reduced by enabling palm rejection; however, the input time was not affected. Moreover, after examining the influence of the screen tilt angle, we concluded that tilting the screen by 20-30° would be most preferable, regardless of whether palm rejection occurred or not.

著者

土井 幸輝 河野 勝 西村 崇宏 藤本 浩志 澤田 真弓 田中 良広 大内 進 金子 健 金森 克浩

出版者

一般社団法人 日本機械学会

雑誌

バイオエンジニアリング講演会講演論文集

巻号頁・発行日

vol.2014, pp.285-286, 2014

著者

坂口 歳斗 土井 幸輝 西村 崇宏 藤本 浩志

出版者

一般社団法人 日本機械学会

雑誌

日本機械学会論文集 (ISSN:21879761)

巻号頁・発行日

vol.84, no.863, pp.18-00119, 2018 (Released:2018-07-25)

参考文献数

29

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Acupuncturists determine muscle stiffness by pressing their fingers down. To shorten the palpation time and minimize discomfort to the patient, a good palpation technique is required to determine the stiffness of the patient's muscles with as few presses as possible. However, palpation is dependent on the experience of the practitioner. Therefore, an investigation of human hardness discrimination characteristics is necessary to provide some quantitative guidance. In this study, to determine the relationship between different numbers of presses and the accuracy of discriminating hardness, we investigated the differential threshold of hardness for different numbers of presses (1, 3, or 5). We used 7 elastic test pieces, each with a different Young's modulus, as the presented stimuli. We conducted an experiment using the constant stimuli method to calculate the differential threshold of hardness as an evaluation index of hardness identification. In the experiment, the participants repeatedly pressed for either 1, 3, or 5 sets by using 2 presented stimuli and then distinguished the hardness of the stimuli. The results of the experiment showed that when the pressing forces were 5 and 10 N, as the number of presses decreased, the differential threshold of hardness increased. However, when the pressing force was 15 N, the differential threshold of hardness was small regardless of the number of indentations. This knowledge will be useful for the improvement of the palpation technique in acupuncture schools. For example, the index of the hardness discrimination characteristic used in this study may be used as a quantitative numerical target and for performance evaluation.

著者

土井 幸輝 開発 勇喜 豊田 航 西村 崇宏 藤本 浩志

出版者

一般社団法人 日本機械学会

雑誌

日本機械学会論文集 (ISSN:21879761)

巻号頁・発行日

vol.83, no.850, pp.16-00470-16-00470, 2017 (Released:2017-06-25)

参考文献数

18

被引用文献数

1

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Tactile characters aid in providing information to visually impaired persons. The Japanese Standards Association enacted basic design methods for embossed tactile patterns in March 2011. However, data on the appropriate size of tactile alphabets are not necessarily enough available. The purpose of this study was to evaluate the influence of the size of a tactile alphabet on identification and to investigate the perceptible size for people without rich tactile experiences. The participants of this study were 15 young people and 15 old people who were unfamiliar with tactile characters intended for visually impaired people. They were asked to discriminate tactile alphabets of six different sizes by using their forefingers without the aid of eyesight. The results showed that the younger and older participants were able to discriminate the presented stimuli faster and more accurately as the stimulus size was increased. Concretely, when the size was 28 mm, each participants regardless of young or older groups could identify the tactile character accurately and quickly. In addition, a trend was seen in that the older group needed larger tactile alphabet sizes than the younger group. We determined the relationship between the tactile alphabet size and discrimination ability of younger and older people without rich tactile experiences.

著者

西村 崇宏 唐澤 洋之 瀬尾 明彦 土井 幸輝

出版者

日本感性工学会

雑誌

日本感性工学会論文誌 (ISSN:18840833)

巻号頁・発行日

vol.11, no.3, pp.475-481, 2012 (Released:2012-06-12)

参考文献数

22

被引用文献数

2

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Recently, the number of studies concerning the development of an interface device using the tactile sense has increased. In this study, we focused on apparent movement occurring in response to temperature stimuli. Apparent movement has been widely studied; however, knowledge regarding apparent movement occurring in response to temperature stimuli is limited. Moreover, the relationship between the rate of occurrence of apparent movement and the factors associated with the occurrence of this movement remains incompletely understood. Therefore, we performed an experiment to evaluate the effect of 2 factors (stimulus duration and stimulus onset asynchrony) on the rate of occurrence of apparent movement. In this experiment, 10 healthy men were asked to place their hand on Peltier elements and answer whether apparent movement occurred. The results of our study show the presence of appropriate conditions for the 2 factors that increase the occurrence rate of apparent movement. Moreover, a strong correlation was found between the rate of occurrence of the apparent movement and clarity of the movement.

著者

西村 崇宏

出版者

早稲田大学人間科学学術院

雑誌

人間科学研究 (ISSN:18800270)

巻号頁・発行日

vol.27, no.1, pp.136-137, 2014-03-26