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

Journal of Ergonomic Technology (JET)
ISSN 2432-1575

Issues

Development of the systems to produce virtual reality
Publish Date : 2001/03/01  Vol.1
Authors : 
Takeshi KAWAI, Kageyu NORO, Waseda University, Japan
Report Outline : 
Technical note
Appeared on Ergonomics of Human System Interaction Vol. 1, No. 1, 32/33, 1994

In virtual reality (VR), sense of reality is important. Though we produce VR using current system, there are various problems in those. Therefore we need to develop the systems to produce VR.
In this research, we developed following 3 systems. 1. Dummy head recording system, 2. Horizontal display VR system, and 3. System to intervene virtual space with both hands.
We will produce VR using these systems, and examine the applications and the effects of those.
Count : 153
The influence of ambient lighting conditions on luminance contrast of electronic displays
Publish Date : 2001/03/01  Vol.1
Authors : 
Satoru KUBOTA, Seikei University, Japan
Report Outline : 
Technical note
Appeared on Ergonomics of Human System Interaction Vol. 1, No. 1, 21/23, 1994

The effects of the screen illuminance and the sly luminance on the contrast ratio of the different technology displays are investigated. It is shown that the contrast ratio is expressed as a function of the display emitting luminance, the luminance coefficient, the specular reflectance, the screen illuminance, and the superimposed light-source luminance. It is also shown that the relationship between the screen illuminance and the sly luminance due to maintain the contrast ratio n3 is estimated by a simple function.
Count : 180
Ergonomic aspects of flat panel displays for VDT use
Publish Date : 2001/03/01  Vol.1
Authors : 
Susumu SAITO, National Institute of Industrial Health, Japan
Report Outline : 
Review article
Appeared on Ergonomics of Human System Interaction Vol. 1, No. 1, 20, 1994

Rapidly developed semiconductor technologies in Japan have brought many types of flat panel displays such as LCD (Liquid Cristal Display) and PDP (Plasma Display Panel) for VDT use in the offices. In order to meet the goal of user comfort of these information displays, physiological functions while viewing these displays were experimentally studied. A significant correlation was found between the velocity of lens accommodation or focusing speed of the eye and the subjective visual comfort. A positive type CRT (Cathode Ray Tube), which has dark characters on a light background, was ascertained to be the most appropriate display type, while the most inferior one was traditional LCD with the least visual comfort and the lowest accommodative velocity.
Count : 173
VDT guidelines for note-type-computer – Making of “VDT Workers” guidelines of Waseda University –
Publish Date : 2001/03/01  Vol.1
Authors : 
Hidehiro YORITAKA, Kageyu NORO, School of Human Science, Waseda University, Japan
Report Outline : 
Technical note
Appeared on Ergonomics of Human System Interaction Vol. 1, No. 1, 14/19, 1994

Note or laptop-type-computers have appeared for 3 and 4 years. They are largely different from desktop-type-computers in their characteristics except the performance. They cannot adopt cultivated comfortable use. The reason for this is that their display has changed from CRT to LCD and their keyboard is smaller. Advantages of LCD are compact, low electric power consumption, etc. On the other hand, it has some faults which it is easy to cause glare, etc.
In the opinion from the site of investigation, this fault is almost caused by the relation between LCD and the surrounding environment, for example lighting, arrangement, etc.
In the VDT guidelines, newly added and revised parts are: how to keep working space, arrangement of note-type-computer (to prevent glare) and adjustment of LCD, etc.
In the separate volume, it is scripted about adjustment by the method of non-parametric approach using flow chart which includes illustration for users’ easy adjustment.
Count : 210
A discussion on factors affecting legibility of flat panel displays
Publish Date : 2001/03/01  Vol.1
Authors : 
Ryohji YOSHITAKE, Human Factors, Yamato Laboratory, IBM Japan
Report Outline : 
Original article
Appeared on Ergonomics of Human System Interaction Vol. 1, No. 1, 5/13, 1994

In case the legibility of flat panel displays (FPDs) is discussed, it is important to recognize the specific technology and the specific period when a study on legibility has been performed, since technology of FPD is making rapid progress recently. This paper summarizes the transition of the technologies of FPDs, equipped on Japanese personal computers (PC). The transition can be divided into three periods. First, FPDs had been emerging as displays for laptop PCs since 1986. The second period was when notebook PCs were widely brought to the market. The characteristics of the FPDs for notebook PCs were low-power consumption and enhanced portability. In the third period, many FPDs had been given a color display. The author has done several studies on legibility and/or quality of several FPDs since 1986. His major studies on legibility of FPDs, which were carried out in each period, are described in this paper. Based on the studies, the factors affecting the legibility and the quality of FPDs are discussed.
Count : 209
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