Biosignal Processing and Integrated Visualizing System for Human Centered Design

 

Chair: Kouki Nagamune, University of Fukui
Email: nagamune at u-fukui.ac.jp
1. 【15270】Visualization System for the Information Measured by Motion Capture System
 Haruya Sunada 1*), Kiyoko Yokoyama 1), Takayuki Hirata 2), Tsuyoshi Matsukawa 3), Hiroki Takada 2)
1) Graduate School of Design & Architecture, Nagoya City University, Japan.
2) Graduate School of Engineering, University of Fukui, Japan.
3) Department of Information Science, Aichi Institute of Technology, Japan.
* sh10hO1 at sda.nagoya−cu.ac.jp

Abstract—This study aims to propose a system to visualize the velocity of motion, velocity/change of acceleration, and shape of trajectory based on the information measured by optical motion capture systems. It is difficult to figure out the above-mentioned information only by physical movements. The system uses various sizes of spheres and trigonal pyramids as well as colors and line segments to express velocity of motion, acceleration of motion, and changes in direction by showing them in a three-dimensional space following the motion trajectories. We conducted a questionnaire survey on the 20 participants of the study, asking them to evaluate whether or not the proposed system was easy to perceive the velocity of motion, acceleration and the change in direction. As a result, we found the system appropriate enough to show velocity and acceleration, and to show a detailed direction.
2. 【15316】Examination of Effects of Chromatic Adaptation on Color Discrimination Threshold
in Dichromatic Color Appearance
 Akiyo Yasui 1*), Go Tanaka 1)
1) Graduate School of Natural Sciences, Nagoya City University, Japan.
* a.yasui at nsc.nagoya-cu.ac.jp

Abstract—It is important to know the color appearance for dichromats to improve their visual environment generally.  To represent the color appearance, the Brettel model has been used.  A comparison of the Brettel model and a model that is modified by considering chromatic adaptation is carried out in this study.  The compassion was carried out using combinations of colors with a very small difference to determine the color discrimination threshold. Through experiments in which a dichromat and trichromats participated, we conclude that there is no essential difference between the two models.


3. 【15378】Cerebral Blood Flow in the Prefrontal Cortex during Reading a Novel
using a Tablet Computer
-Temporary and remaining changes-
 Akihiro Sugiura 1*), Takuya Eto 2), Fumiya Kinoshita 3), Hiroki Takada 2)
1) Department of Radiological Technology, Gifu University of Medical Science, Japan.
2) Graduate School of Engineering, University of Fukui, Japan.
3) Institute of Innovation for Future Society, Nagoya University, Japan.
* asugiura at u-gifu-ms.ac.jp

Abstract—We aimed to investigate how reading a book on a tablet computer affects sleep by measuring cerebral blood flow in the prefrontal cortex. Seven students (7 men, age: 21–32 years) participated in this study. Under a controlled illuminance environment, the subjects read a novel in printed form or on a tablet computer from any distance. As the subjects were reading, the cerebral blood flow in their prefrontal cortex was measured using near infrared spectroscopy. Considering the results from this study and from previous studies on physiological characteristics during non-rapid eye movement sleep, we concluded that reading a book on a tablet computer before the onset of sleep leads to potential inhibition of comfortable sleep through mechanisms other than the suppression of melatonin secretion.
4. 【15400】A study of the relationship of equilibrium function and the cerebrum blood flow
with alcohol intake
 Masumi Takada 1*), Yuki Mori 2), Fumiya Kinoshita 3), Hiroki Takada 2)
1) Faculty of Nursing and Rehabilitation Department, Chubu Gakuin University, Japan.
2) Graduate School of Engineering, University of Fukui, Japan.
3) Institute of Innovation for Future Society, Nagoya University, Japan.
* m.takada at chubu-gu.ac.jp

Abstract—As it increase in the Blood Alcohol Level (BAL), restraint of a cerebral cortex and cerebellum function from the relaxation state. Then it is increases in risk of fall down or fall because of restraint of the cerebellum function. In this study, we focused on the deterioration of equilibrium function with the above-mentioned suppression under the influence of alcohol. We herein compared the time course of stabilometry with that of cerebrum blood flow by using fNIRS. We thus considered that equilibrium dysfunction would occur with alcohol ingestion due to inactivation of the cerebrum.
5. 【15402】Expression of balance function after exposure to stereoscopic video clips
 Fumiya Kinoshita 1*), Masumi Takada 2), Masaru Miyao 3), Hiroki Takada 4)
1) Institute of Innovation for Future Society, Nagoya University, Japan.
2) Faculty of Nursing and Rehabilitation Department, Chubu Gakuin University, Japan.
3) Graduate School of Information Science, Nagoya University, Japan.
4) Graduate School of Engineering, University of Fukui, Japan.
* f.kinoshita at coi.nagoya-u.ac.jp

Abstract—Recently, with the rapid progress in image processing and three-dimensional (3D) technologies, stereoscopic images are available not only on television but also in theaters and gaming consoles. Asthenopia and visually induced motion sickness (VIMS) are well-known phenomena, which are experienced by users while viewing video, playing immersive video games, and other such activities. In previous studies, we pointed out peripheral viewing as a pathogenesis of VIMS, the evidence of which was demonstrated and the anomalous sway was described using mathematical models. Moreover, stochastic differential equations can mathematically model the body sway phenomenon. In this study, we discuss the metamorphism in the potential functions to control the standing posture during exposure to stereoscopic video clips.


 6. 【15386】Gait Analysis with Six Axes Inertial Sensor and Force Sensor for Daily Motion
 Keita Aoike 1), Kouki Nagamune 1*)
1) Graduate School of Engineering, University of Fukui, Japan.
* nagamune at u-fukui.ac.jp

Abstract—Gait is one of fundamental motion in human daily life.  Therefore, malfunction for gait motion strongly affects the human health. Gait analysis helps to prevent the human health from the malfunction gait. This study developed a sole pressure measurement system which can provide sole pressure and pose of sole in gait motion. In the experiment, the system was applied for normal human to examine several daily motions. Consequently, the system could provide sole pressure and pose in gait motion.