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Kentaro Kotani,Hiroki Sato,Satoshi Suzuki,Takafumi Asao 대한인간공학회 2014 대한인간공학회 학술대회논문집 Vol.2014 No.5
This study introduces a potential technique for Japanese kana characters on tactile information display device (tactile display) that allows the user effectively perceived. Currently tactile display has not been developed for the purpose of character information transmission due to poor performance of recognition rates in terms of characters. The purpose of this study is to evaluate a novel technique, flick motion based display, for presenting Japanese kana characters on the tactile display (FMR tactile display). Flick motion is normally used as an input scheme for mobile devices, as one of touch screen gestures. In Japan, a set of flick motions on 10 isolated areas on the touch screen is especially assigned as Japanese kana character entry. Many Japanese mobile phone users have its mental model, which was applied to present character information as an output scheme into tactile display. Experiments were conducted to evaluate how the implemented presentation system can perform well to let the user perceive kana characters. A total of 10 subjects, including users unfamiliar to FMR, participated in the study. The subjects located their right hand on the tactile display and a kana character by using FMR was given on the display. They responded the characters as soon as they perceived. Number of correct recognition of the characters were obtained throughout the set of trials consisted of 20 character presentations. The results showed that the average correct recognition rates were 41.5 percent and the average reaction time was 6.8 seconds, which were faster than conventional trace-based character representations. The results suggested that fine adjustment of the palm to the tactile display and changing stimulus duration would improve the performance of recognition rates.
Kentaro Kondo,Takashi Hoshide 한국지질과학협의회 2022 Geosciences Journal Vol.26 No.2
The upper Kayaoka sheet in the Atsumi area, Northeast Japan, has an alkaline-basaltic composition. The modal olivine and Ni enrichment in the lower part of the sheet indicates the accumulation of early formed olivine crystals. Overall, the average aspect ratio of plagioclase increases from the central part of the sheet toward both the top and bottom margins. The average aspect ratios of plagioclase and calculated crystallisation times at each height of the sheet, except for the lowermost margin, are roughly plotted near the regression line drawn based on those from many sills in previous research. However, we observed that the average aspect ratios of plagioclase in some horizons of the central part of the sheet exhibit an offset from the regression line. The olivine analcite dolerite in the central part of the sheet is rich in zeolite amygdules and glassy mesostasis with a quench texture. These observations suggest that the cooling rate in the central part of the sheet was faster compared with assuming conductive cooling only. A plausible mechanism for the rapid cooling at the centre of the sheet is heat transport by the convection of seawater that has infiltrated the columnar joint.
( Kentaro Kotani ),( Hiroki Sato ),( Satoshi Suzuki ),( Takafumi Asao ) 한국감성과학회 2014 춘계학술대회 Vol.2014 No.-
This study introduces a potential technique for Japanese kana characters on tactile information display device (tactile display) that allows the user effectively perceived. Currently tactile display has not been developed for the purpose of character information transmission due to poor performance of recognition rates in terms of characters. The purpose of this study is to evaluate a novel technique, flick motion based display, for presenting Japanese kana characters on the tactile display (FMR tactile display). Flick motion is normally used as an input scheme for mobile devices, as one of touch screen gestures. In Japan, a set of flick motions on 10 isolated areason the touch screen is especially assigned as Japanese kana character entry. Many Japanese mobile phone users have its mental model, which was applied to present character information as an output scheme into tactile display. Experiments were conducted to evaluate how the implemented presentation system can perform well to let the user perceive kana characters. A total of 10 subjects, including users unfamiliar to FMR, participated in the study. The subjects located their right hand on the tactile display and a kana character by using FMR was given on the display. They responded the characters as soon as they perceived.
Kentaro Atsukawa,Shuntaro Amari,Hiroshi Takiyama 한국공업화학회 2022 Journal of Industrial and Engineering Chemistry Vol.106 No.-
Quality control of the crystalline materials obtained from melts with the difficulty of nucleation is challenging. When nucleation is enhanced in such melts, the quality distribution is improved. Herein, the aerationmethod, which enhances nucleation in solution systems, was employed in a melt to investigate theaeration effect on nucleation in a melt and the effect of the crystallization conditions with aeration on theinduction time sind. Experimental results show that aeration enabled nucleation in a melt under supercoolingconditions, where nucleation could not occur without aeration. Furthermore, sind depended onthe operating conditions with aeration (initial supercooling, aeration period, and atmospheric temperature). The crystal size in the obtained solid phase decreased as the atmospheric temperature decreased. These results suggest that the desired nucleation timing and crystal size can be obtained by manipulatingthe crystallizer and aeration conditions. Thus, aeration is promising for improving the quality distributionsin crystalline materials.
Kentaro Yano,Hiromasa Nakashima,Masanobu Koga 제어로봇시스템학회 2009 제어로봇시스템학회 국제학술대회 논문집 Vol.2009 No.8
This paper presents a control system design method based on numerical computation with highly guaranteed accuracy using multiple-precision arithmetic. By using the proposed methods, it is possible to guarantee the numerical quality about the design of control system with the very high accuracy which is impossible to compute by usual double precision arithmetic. We also propose a method to find the controller which minimizes an evaluation function for the design specification quickly by using multiple-precision arithmetic and Krawczyk method. And, this paper applies the proposed method to LQ control problem.