Publication statistics

Pub. period:1989-2006
Pub. count:17
Number of co-authors:14



Co-authors

Number of publications with 3 favourite co-authors:

T. Miyoshi:2
Atsushi Uetake:2
Yosuke Takasawa:2

 

 

Productive colleagues

Atsuo Murata's 3 most productive colleagues in number of publications:

M. Kumashiro:3
Atsushi Uetake:2
T. Miyoshi:2
 
 
 

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Atsuo Murata

Has also published under the name of:
"A. Murata"

 

Publications by Atsuo Murata (bibliography)

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2006
 
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Murata, Atsuo (2006): Eye-Gaze Input Versus Mouse: Cursor Control as a Function of Age. In International Journal of Human-Computer Interaction, 21 (1) pp. 1-14. Available online

The usability of an eye-gaze input system to aid interaction with computers for older computer users was investigated. The eye-gaze input system was developed using an eye-tracking system. An experiment using the developed eye-gaze input system was conducted while systematically manipulating experimental conditions such as the moving distance, size of a target, and direction of movement in a pointing task. The usability of the eye-gaze input was compared among three age groups (young, middle-aged, and older adults) and with that of a traditional PC mouse. The eye-gaze input system led to a faster pointing time as compared with mouse input, especially for older adults. This result demonstrates that an eye-gaze input system may be able to compensate for the declined motor functions of older adults when using mouse input.

© All rights reserved Murata and/or Lawrence Erlbaum Associates

2004
 
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Murata, Atsuo (2004): Effects of Duration of Immersion in a Virtual Reality Environment on Postural Stability. In International Journal of Human-Computer Interaction, 17 (4) pp. 463-477. Available online

Few studies have been carried out to examine the relation between postural stability and subjective reports or feelings of motion sickness. Two views seem to exist on the relation between immersion in a virtual reality (VR) environment and subjective feelings of motion sickness. One predicts that the immersion induces both postural instability and motion sickness. Another view is that preimmersion postural instability predisposes people to motion sickness. However, these views are not supported by empirical research. Longer immersions in a VR environment may induce higher levels of postural instability and symptoms of motion sickness. In this study, effects of long-hours immersion in a VR environment on postural stability were examined to approach the underlying mechanism of postural instability and motion sickness using force platform measurement and self-reported questionnaire on motion sickness. As a result, it was suggested that longer immersion in a VR environment induced postural instability and symptoms of motion sickness.

© All rights reserved Murata and/or Lawrence Erlbaum Associates

2003
 
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Murata, Atsuo, Uetake, Atsushi, Matsumoto, Syuichiro and Takasawa, Yosuke (2003): Evaluation of Shoulder Muscular Fatigue Induced During VDT Tasks. In International Journal of Human-Computer Interaction, 15 (3) pp. 407-417.

This study was designed to evaluate localized muscular fatigue induced during visual display terminal (VDT) tasks. In the experimental paradigm used, electromyography (EMG) signals were not recorded during the VDT task but during isometric contractions in which the load imposed on the shoulder muscle was kept constant. The change in mean power frequency (MPF) and the root mean square values of EMG signals with time were explored. The correspondence between these measures and the psychological rating of localized muscular fatigue also were examined. The effectiveness of the experimental paradigm and of the measures used for evaluation of localized muscular fatigue are discussed. MPF measured during isometric contraction was found to be a sensitive measure of localized muscular fatigue.

© All rights reserved Murata et al. and/or Lawrence Erlbaum Associates

2001
 
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Murata, Atsuo, Uetake, Atsushi, Otsuka, Miho and Takasawa, Yosuke (2001): Proposal of an Index to Evaluate Visual Fatigue Induced During Visual Display Terminal Tasks. In International Journal of Human-Computer Interaction, 13 (3) pp. 305-321.

The study described in this article was designed to evaluate visual fatigue induced during video display terminal (VDT) tasks. Newly developed equipment was used that can simultaneously measure pupillary change, focal accommodation, and eye movement. The changes in these 3 physiological measures, taken during a VDT task, were used to propose an index for evaluating visual fatigue. Through multiple regression analysis, an index to describe the psychological sense of visual fatigue was obtained. In this index, the minimum pupil diameter, velocity of focal accommodation for constriction, and width of focal accommodation were included. The results suggest that visual fatigue in VDT tasks can be evaluated effectively using both pupil diameter and focal accommodation. The index can be used to assess visual fatigue induced during a VDT task if the following 3 conditions are satisfied: 1. Head movement is limited and infrequent. 2. The task requires focal accommodation. 3. During the task, there is no outstanding change in the lighting environment such as luminous intensity or brightness.

© All rights reserved Murata et al. and/or Lawrence Erlbaum Associates

 
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Miyoshi, T. and Murata, Atsuo (2001): Improvement of Understanding of Icons by Label and Context. In: Proceedings of the Ninth International Conference on Human-Computer Interaction 2001. pp. 463-467.

 
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Murata, Atsuo, Takahashi, Y. and Miyoshi, T. (2001): An Attempt to Evaluate Cognitive Workload in Human-Computer Interaction. In: Proceedings of the Ninth International Conference on Human-Computer Interaction 2001. pp. 468-472.

1999
 
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Murata, Atsuo (1999): Extending Effective Target Width in Fitts' Law to a Two-Dimensional Pointing Task. In International Journal of Human-Computer Interaction, 11 (2) pp. 137-152.

This research was designed to develop the definition of effective target width in a 2-dimensional pointing task. The idea of effective target width in a 1-dimensional pointing task was extended to effective target width in a 2-dimensional pointing task using the 2-dimensional joint probability density function. The validity of this theoretical definition was empirically verified. In the experiment, the moving direction of the mouse was from lower left to upper right. The approach angle was fixed to 45{deg}. The fit of conventional and new models to the experimental data was compared by means of contribution of the regression line that showed the relation between the index of difficulty and the mean pointing time. As a result, we could obtain higher values of contribution for the modeling that introduced effective target width than that for the conventional modeling without it. In conclusion, the proposed 2-dimensional definition of effective target width may be promising for predicting and modeling pointing time in human-computer interactions.

© All rights reserved Murata and/or Lawrence Erlbaum Associates

 
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Murata, Atsuo (1999): Identification of an Acceptable Mixture of Key and Speech Inputs in Bimodal Interfaces. In International Journal of Human-Computer Interaction, 11 (4) pp. 339-348.

This study was designed to determine the acceptable mixture level of key and speech inputs in a bimodal interface in which users were permitted to use both key and speech input systems. The mixture level was a controlled experimental

© All rights reserved Murata and/or Lawrence Erlbaum Associates

 
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Murata, Atsuo, Fujii, M., Arima, Y. and Iwase, H. (1999): Extending effective target width in Fitts' law to two-dimensional pointing task. In: 1999. pp. 1236-1240.

 
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Murata, Atsuo, Fujii, Michihiro, Arima, Yasuhiro and Iwase, Hirokazu (1999): Extending effective target width in Fitt's law to two-dimensional pointing task. In: Bullinger, Hans-Jorg and Ziegler, Jrgen (eds.) HCI International 1999 - Proceedings of the 8th International Conference on Human-Computer Interaction - Volume 2 August 22-26, 1999, Munich, Germany. pp. 1236-1240.

1998
 
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Murata, Atsuo (1998): Improvement of Pointing Time by Predicting Targets in Pointing with a PC Mouse. In International Journal of Human-Computer Interaction, 10 (1) pp. 23-32.

A method was proposed for the prediction of a target to which a user is to point with a mouse on the basis of the trajectory of the mouse cursor. An empirical study was carried out in order to evaluate the validity of the proposed prediction algorithm to reduce the pointing time with the prediction accuracy remaining high. The effects of the distance between the edges of two adjacent targets and the position of the indicated target on the prediction accuracy were investigated. Pointing with no prediction mode was also conducted. In the prediction method, the angle between the cursor movement vector and the vector that connected the current cursor position and the center of each target was calculated respectively at various sampling frequencies and intervals, and the minimum cumulative value was determined as the prediction target. The pointing time of the prediction method was shown to be less than that of the control condition for various combinations of the sampling interval and frequency. The trade-off between the pointing time and the prediction accuracy was also clarified. The prediction accuracy was found to be affected by the position of the target. The prediction accuracy at Positions 2 and 4, which have neighbors on both sides, was especially low. The distance between the edges of two adjacent targets affected the prediction accuracy, especially at Positions 2 and 4. Implications for application of the algorithm are given.

© All rights reserved Murata and/or Lawrence Erlbaum Associates

 
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Murata, Atsuo (1998): Effectiveness of Speech Response Under Dual-Task Situations. In International Journal of Human-Computer Interaction, 10 (3) pp. 283-292.

The effectiveness of speech response under a dual-task situation in which participants entered 10 alphabetic strings while concurrently manipulating a robot was examined by an experimental design using response mode as a between-subject factor. The effect of the number of inputs in robot manipulation on dual-task efficiency was also investigated in order to discuss whether the performance benefits for the speech response are enhanced by increasing workload (number of inputs). A total of 12 male participants manipulated a robot using a speech input device. A second group of 12 male participants performed the task using a keyboard. The dual-task efficiency entry time of the speech response was better than that of the manual response. The dual-task percentage correct of the speech response was higher than that of the manual response. Increasing the workload (number of inputs required for robot manipulation) made these tendencies more noticeable. It was clarified that the manual input in the secondary robot manipulation task resulted in output competition between the two discrete tasks that disrupted the dual-task efficiency of the primary entry task. In conclusion, some dual-task benefits were found for the speech input method especially when the number of inputs increased.

© All rights reserved Murata and/or Lawrence Erlbaum Associates

1996
 
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Murata, Atsuo (1996): Empirical Evaluation of Performance Models of Pointing Accuracy and Speed with a PC Mouse. In International Journal of Human-Computer Interaction, 8 (4) pp. 457-469.

This study looks at the performance model of mouse movement from the following three viewpoints: (a) effects of the direction of movement on the performance model, (b) optimal formula to define the size of targets in the performance model, and (c) comparison of fit to the pointing time among five performance models. As a result, it was shown that the fit to the experimental data did not differ among four conditions of direction of movement. The contribution of the performance model was found to be the highest when the square of the area of a target is used as the size of a target. Moreover, the performance model based on the multiple-regression analysis was better than that based on Fitts's law.

© All rights reserved Murata and/or Lawrence Erlbaum Associates

 Cited in the following chapter:

Fitts's Law: [/encyclopedia/fitts_law.html]


 
 Cited in the following chapter:

Fitts's Law: [/encyclopedia/fitts_law.html]


 
1995
 
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Murata, Atsuo (1995): Discussion on Method for Predicting Targets in Pointing by Mouse. In: Proceedings of the Sixth International Conference on Human-Computer Interaction 1995. pp. 719-724.

In this paper, the method to predict a target which a user is about to point with a mouse on the basis of the trajectory of the mouse cursor was proposed. The effects of the interval between targets, the sampling interval and the number of selection of targets on the point time and the prediction accuracy were investigated. The pointing with no prediction mode was also conducted. As a result, the prediction method 1 that regarded the target which was selected continuously 5 times as the candidate target was found to be proper from the viewpoint of the prediction accuracy. On the other hand, the prediction method 2 that calculated the angle between the cursor movement vector and the vector which connected the current cursor position and the center of each target, and determined the minimum cumulation value as the candidate was proper in that the point time was shorter than the method 1. The optimal condition of the prediction method 1 was st=4ticks and d >= 30dots. The optimal condition of the prediction method 2 from the viewpoint of the prediction accuracy was n=6, 8, 10.

© All rights reserved Murata and/or Elsevier Science

1991
 
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Murata, Atsuo (1991): An Experimental Evaluation of Mouse, Joystick, Joycard, Lightpen, Trackball and Touchscreen for Pointing -- Basic Study on Human Interface Design --. In: Proceedings of the Fourth International Conference on Human-Computer Interaction 1991. pp. 123-127.

In this study, the evaluation of six input devices for the pointing speed, accuracy and usability was tried in the sorting task of five 3-digit numbers. The joystick was found to be the fastest of all devices. With respect to the accuracy, the lightpen was the most accurate. Judging from the pointing speed, accuracy and subjective feeling on usability, the joystick was found to be the most effective.

© All rights reserved Murata and/or Elsevier Science

 
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Murata, Atsuo (1991): Evaluation of Mental Workload in Location Task by HRV Measures -- Relation between Work Level and Mental Workload --. In: Proceedings of the Fourth International Conference on Human-Computer Interaction 1991. pp. 190-194.

In this paper, an attempt was tried to evaluate the effects of layout complexity in the location task on mental workload by means of HRV (Heart Rate Variability) measures. The mental workload value obtained by the method of paired comparison increased in proportion to the entropy of layout complexity. Moreover, the HRV measures TP, DSD{sub:b} and DSD{sub:c} were found to be effective measures of mental workload.

© All rights reserved Murata and/or Elsevier Science

1989
 
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Murata, Atsuo, Miyake, S. and Kumashiro, M. (1989): Heart Rate Variability in Remote Manipulation System. In: Proceedings of the Third International Conference on Human-Computer Interaction 1989. pp. 217-224.

In this paper, Heart Rate Variability (HRV) in the remote manipulation task over a period of 2 hours was considered using 8 HRV measures the change of these measures with time was examined to determine which HRV measures are suitable as an indicator of operators' mental workload or mental stress under the man-computer system. As a result, it was shown that HRV measures called D-complex are useful indicators of the mental workload and have strong correlations with the work performance.

© All rights reserved Murata et al. and/or Lawrence Erlbaum Associates

 
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