This paper is concerned with the features of the sorting method on two examples in different conditions. The aims of this study are 1) to propose the procedure of the sorting method, 2) to arrange the viewpoints for analyzing the acquired data, 3) to apply to Sensory Evaluation. The rating in this method stands on coherent whole view rather than complex element views. The subjects are given less restriction in order to obtain the data closer to their valuation basis. For the first example, the unrestricted sorting method is applied to the occupation labels of 18 evaluation samples. For the second example, the restricted sorting method of 5 categories is applied to the occupation labels of 30 evaluation samples. The difference among the conditions of classification frame influenced small frequency samples in each category of evaluation. In the same condition, most differences among the groups were not seen. However, the differences among 7 groups appear by the frequencies of ΣP_k(i, j), which indicates two samples in the same category. The result of ALSCAL for 7 dissimilarity matrixes shows the fair convergence on 4 dimensions.

View full abstract

This paper deals with human control behavior of eye movement tracking task for manual control system. Tracking tasks in eye movement are differ from a general method and comparatively unaccustomed to manual control of system with hand. In this paper, it presented the results of a preliminary experiment for tracking the target in display by the eye movement. This control system in the tracking task is so much difficult than the control with hand. In order to improve control task of eye movement, we used a shaping filter in feed forward of the controlled system. It is concluded that this method improves the control task nearly equal to the control task with hand.

View full abstract

Braille is one of the most popular visual substitution techniques for the blind to get information. Recently it is becoming a problem that many blind people cannot distinguish Braille. This problem is caused by the small size of the dots therefore, it is difficult especially for beginners to read them. The characteristics of embossed dots that consist of Braille are different from each printer, and it has been known that those characteristics affect the legibility. In this study, for the purpose of defining various patterns of Braille on a sensory level, we examine three factors; the influence of the cross section shapes, height of the dots, and the distance between dots. The participants of this experiment are beginning Braille readers with normal vision. They were given discrimination tasks of Braille-like patterns defined by the combination of three factors mentioned previously. The results show that the effects of the height of the dots and the distance between the dots were different among the shape of cross section, so distinguishability is influenced by interaction of each other, providing helpful data for legible Braille pattern.

View full abstract

This paper aims at examining relationship between time constraint and performance in decision making task by subdividing the stage of time constraints. An experiment was carried out to identify work efficciency, work time and decision-making strategy under the conditions of seven stages in time constraint and two kinds of task difficulty. Decision-making task prepared by Payne et al (1988) was adopted for this experiment. Fourteen male students were asked to 24 trials in each 7-stage of time constraint and in easy and difficult decision-making tasks. It was clarified in these experiments that working time was shortened as being accompanied by the shortening of time constraint irrespective of task difficulty, but that work accuracy was kept up to a certain condition of time constraint and then decreasing, and that decrement of work accuracy was significantly different by task difficulty and decision-making strategy. The results of the experiment suggested that type of the error increasing mainly caused by time constraint were influenced by task difficulty.

View full abstract