VDT Operation Research Articles

Strategies on Uniformity Lighting in Office Space under Energy-Saving Environment

In this study, our focus was on exploring the changing illuminance of work surfaces in different ambient uniformity spaces in the office, with a specific emphasis on sustainability and energy-saving considerations. To investigate this, we conducted a comprehensive study in a laboratory setting that replicated an office environment. The study involved the participation of 20 adults as subjects. The findings of our study revealed a strong correlation between the uniformity of ambient lighting illuminance within the indoor space and the illuminance levels observed specifically at the task plane. Notably, when the surrounding illuminance exhibited uniformity, we observed a significant reduction in the EH as adjusted by participants during VDT operation. Interestingly, the task illuminance adjusted by the subjects was lower than the usual standard. However, we did not find any significant correlation between the uniformity of indoor ambient lighting illuminance and the appropriate VDT screen luminance. In situations where energy-saving measures are required, it is crucial to maintain an even luminance in the surrounding space to ensure that the minimum lighting level in the office is upheld. Future discussions should delve into task-ambient lighting models, exploring beyond task illuminance standards alone.

Assessment of fatigue caused by VDT operation

In recent years, there has been a growing interest in smart glasses (SG) incorporating augmented reality (AR) technology. The most remarkable feature of SG is that users can execute tasks with both hands while getting necessary information while without taking their eyes off the task at hand. Such hands-free (HF) access to information can help prevent contamination. We are engaged in developing HF manuals for medical applications using SG. Use of SG could be expected to be associated with eye strain and headaches, but these could also occur when the users read manuals displayed on a LCD display (PC) or manuals printed on paper (Paper). In order to compare the effects of presentation of manuals in different modalities, 77 randomly selected students and faculty members were assigned to read HF (n=27), PC (n=40), and Paper (n=10) manual. The degree of eye strain induced by each presentation was compared by the flicker value, blinking frequency, high frequency component (HFC), pulse rate and “subjective symptoms”1), before and after loading for an hour. The results revealed less fatigue in the group assigned to HF as compared to the other groups. Therefore, there are no major obstacles to HF manual development.

E203 視覚疲労の生理的評価指標としての瞳孔計測(VDT作業,一般演題:口演,地方の時代の産業保健,第79回日本産業衛生学会)

E203 視覚疲労の生理的評価指標としての瞳孔計測(VDT作業,一般演題:口演,地方の時代の産業保健,第79回日本産業衛生学会)

高さ調整可能なＦＰＤ使用時のＶＤＴ作業

高さ調整可能なＦＰＤ使用時のＶＤＴ作業

Analysis on Fatigue and other matter in VDT Operation for Mouse and Keyboard Inpur

Analysis on Fatigue and other matter in VDT Operation for Mouse and Keyboard Inpur

Analysis of vertical viewing angles during VDT operation for VDT workstation design

Analysis of vertical viewing angles during VDT operation for VDT workstation design

Types of activities and body parts affected in the recommended exercises for VDT operators.

This paper presents results of an analysis of recommended exercises proposed for the reduction of musculoskeletal stress in VDT operation and similar types of work. Fifteen exercise programs consisting of 123 individual exercises were reviewed. Most of the programs exhibited some redeeming features from a practical and a professional standpoint. It was found that recommendations concerning exercises have been directed primarily to muscle stretching and relaxation. The body parts targeted by various exercises were back, leg, neck, shoulder, side and upper extremities. Maximum number of exercises were available for shoulder (35.8%) and upper extremities (17.9%). The exercises reviewed consisted of combinations of thirteen different activities. It was found that rotation (26.8%), stretching (20.3%), and flexing or bending (18.7%) were the most frequently employed activities.

Evaluation op the dc electrical environment in proximity to VDTS

Abstract Two VDTs were tested to determine their impact on the DC electrical environment. Characteristics of the DC environment were measured — ion concentration, ion current density and DC electric field. Measures of particulate levels, temperature and humidity were included since these factors are known to influence the DC environment. Ion concentrations, especially negative ion concentrations, varied as a function of distance from the VDTs, with the lowest values observed in the immediate vicinity of the VDTs for both models tested. This effect was slight and within the range of expected indoor values for ion concentrations. DC electric fields were generally found to be higher during VDT operation compared to controls, although they were within the same order of magnitude as commonly experienced fields due to charges on materials (e.g. clothing, carpet) indoors. Particulate levels were not observed to be altered by VDT operation.

VDTによる新聞製作と作業環境管理

VDTによる新聞製作と作業環境管理

The Effects of Transient Adaptation on VDT Operations

The purpose of this study was to investigate the effects of transient adaptation in a simulated VDT operation. Specifically, the study attempted to determine transient adaptational effects that may result in visibility losses or decrements in visual performance, when an observer shifts his or her point of regard from a region of higher overall luminance (e.g., a negative contrast source document with dark characters on a light background) to a region of lower overall luminance (e.g., a positive contrast video display with light characters on a dark background), and vice versa. The source document and VDT display were simulated using a back-projection, free-viewing apparatus. The luminance shifts made up the two transient conditions: a downward change in luminance level (i.e., negative to positive contrast displays), and an upward change in luminance level (i.e., positive to negative contrast displays). The results of these two transient state conditions were compared to two steady state conditions in which there was no change in luminance level or flash contrast thresholds (i.e., Sloan-Snellen test-letter flash was superimposed on the display) were determined using the up-and-down psychophysical method combined with the forced-choice technique and knowledge of results. The ratio of the transient state contrast threshold to the steady state contrast threshold served as an index of visibility loss. The goal of the research due to transient adaptation in VDT operations, but to also determine possible advantages and disadvantages of positive vs. negative contrast video displays.

Mental work load on VDT operation under a self-paced working condition--a case of programmers using VDT

Mental work load on VDT operation under a self-paced working condition--a case of programmers using VDT

Students Learn VDT Operation, Improve Grammar at Same Time

Students Learn VDT Operation, Improve Grammar at Same Time