Issues : JET is a peer-reviewed, open-access scientific journal : Journal of Ergonomic Technology (JET)

Journal of Ergonomic Technology (JET)
ISSN 2432-1575


Application of Discrete Laplace's Equation to Create Topography Map of Near-infrared Spectroscopy Signal
Publish Date : 2015/03/01  Vol.15
Authors : 
Kotaro TAKEDA, Clinical Research Center, National Hospital Organization Murayama Medical Center
Yutaka TOMITA, Fujita Memorial Nanakuri Institute, Fujita Health University
Report Outline : 
Original article
Appeared on Ergonomics of Human System Interaction, Vol. 15, No. 1, 6/11, 2013

Abstract: Near-infrared spectroscopy (NIRS) enables non-invasive measurement of hemoglobin concentration changes in the cerebral cortex. Creation of a topography map is an important evaluation method used in clinical NIRS studies. In this study, we used Laplace's equation method to create topography maps of NIRS. The method was tested and found to converge very precisely. The method was applied to NIRS signals, and it gave a smooth picture, which did not contradict our physiological knowledge. Finally, a noisy signal was omitted and a topography map was constructed without the information of the corresponding channel, with accurate results.
Keywords: Oxygenated hemoglobin, fNIRS, Optical Topography
Count : 680
A simple load sensor aiming applications of subsidiary behavior evaluation
Publish Date : 2015/03/01  Vol.15
Authors : 
Kaoru, SUZUKI, Faculty of Science and Engineering, Hose University
Hayato HIYAMA, KSP-SP Co., Ltd.
Takeshi OKADA, COMCO Corporation
Report Outline : 
Original article
Appeared on Ergonomics of Human System Interaction, Vol. 15, No. 1, 1/5, 2013.

This paper deals with a simple and cost effective load sensor aiming applications of subsidiary behavior evaluation. A key device of the sensor is a force sensitive resistor, It is sold as 'force sensitive', haves as 'pressurized area sensitive' however. The authors combined the resistor with hemisphere shaped rubber feet and an electric circuit based on a current/voltage converter, and thus constructed the sensor. The sensors ere used to evaluate area of postural sway while performing VDT work with sitting posture. The areas obtained from proposed sensors were correlated highly with that obtained from traditional force plates.

Keywords: Postural sway, VDT work, Subsidiary behavior, Load sensor
Count : 180
Sound Environmental Improvement in Open Classroom by Sound Masking
Publish Date : 2014/03/01  Vol.14
Authors : 
Yutaka TOMITA, Fujita Health University
Kazutami SUKA, Keio University
Report Outline : 
Original article
Appeared on Ergonomics of Human System Interaction, Vol. 14, No. 1, 9/14, 2012

Recently many student experiment training rooms are becoming open type, in which partitions separate the rooms, and lecturers give instructions. Although in the open space experiment training rooms students feel open, easy to move and easy to arrange experiment subjects, voices of lecturers interfere so much and as a consequence the interference interrupt the lectures in next compartments.
To make better sound environment which does not annoy lectures was aimed by generating particular masking noise, which reduces the interference from other lecturers. The generated noise was kept at the same sound level as air-conditioning equipments.
so the best suited masking noise using multiple sound samples was devised.
This paper describes the outline and the assessment experiment of this sound masking system specific to our student experimental laboratory.
Count : 215
Effect of Thermal Information Presentation to Mouse for Photographic Image Browsing
Publish Date : 2014/03/01  Vol.14
Authors : 
Shigeyoshi Iizuka, Kanagawa University
Sakae Yamamoto,Tokyo University of Science
Report Outline : 
Original article
Appeared on Ergonomics of Human System Interaction, Vol. 14, No. 1, 1/8, 2012.

Generally in the Web communication, we depend on the great amount of information
received from vision. When sensational information other than vision is used, it is effectively works
as a complementary feeling. This research focuses on the use of variations in temperature to
represent information expressively. The mouse with thermal capabilities is a device that becomes
warmer (colder) at a user's palm when the user clicks “warm” (“cold”) photographic images on a
computer screen. Each image has an associated thermal value. In this paper, the result of an
experiment indicates that the thermal expression to mouse affects a user's impression of images.
Key Words: Thermal information, Thermal mouse, Warm sense, Cold sense, Pair comparisons
Count : 186
A Simple Power Spectral Analysis for Heart Rate Variability
Publish Date : 2013/03/01  Vol.13
Authors : 
Abbas Orand, Yutaka Tomita, Keio University
Report Outline : 
Technical note
Appeared on Ergonomics of Human System Interaction, Vol. 13, No. 1, 15/16, 2011.

Keywords: Fourier transform of unevenly spaced time series, Heart rate variability, Regression analysis, Confidence interval
Count : 518
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