Effect of Drilling Speed and Task Duration on Workers’ Performance Using a Modified Feed Handle

2021 ◽  
pp. 51-58
Author(s):  
Masood Ashraf ◽  
Mohammad Muzammil ◽  
Abid Ali Khan
Keyword(s):  
Drilling Speed ◽  
Task Duration ◽  
And Task

Effects of Sensory Modality and Task Duration on Performance, Workload, and Stress in Sustained Attention

2004 ◽  
Vol 46 (2) ◽  
pp. 219-233 ◽  
Author(s):  
James L. Szalma ◽  
Joel S. Warm ◽  
Gerald Matthews ◽  
William N. Dember ◽  
Ernest M. Weiler ◽  
...  
Keyword(s):  
Sustained Attention ◽  
Sensory Modality ◽  
Task Duration ◽  
And Task

scholarly journals It’s about Time: Effects of Physical Exertion on Duration Estimates

2019 ◽  
Vol 4 (1) ◽  
pp. 6
Author(s):  
Britton W. Brewer ◽  
Lawrence O. Schwartz ◽  
Allen E. Cornelius ◽  
Judy L. Van Raalte ◽  
Edmundo L. Urbina ◽  
...  
Keyword(s):  
Physical Activity ◽  
High Intensity ◽  
Perceived Exertion ◽  
Physical Exertion ◽  
Fundamental Aspect ◽  
Time Effects ◽  
Task Duration ◽  
Low Intensity ◽  
D Values ◽  
And Task

Background: Task duration is a fundamental aspect of exercise, but little is known about how completed bouts of physical activity are perceived. Consequently, the purpose of the five experiments conducted for this investigation was to examine the effects of engaging in physical tasks on retrospective duration estimates with college student participants. Methods: Across the five experiments, participants were 113 college students (82 women, 31 men). In Experiments 1 and 2, participants provided duration estimates of a period spent engaging in physical activity or rest. In Experiments 3, 4, and 5, participants provided duration estimates of periods spent engaged in physical tasks of high intensity and low intensity. Results: In Experiments 1, 2, and 3, participants engaged in physical activity tended to perceive durations as shorter than participants at rest. When completing less familiar tasks (Experiments 4 and 5), however, participants recalled a high intensity bout of physical activity as lasting longer than a low intensity bout of physical activity of comparable duration. Cohen’s d values for physical activity effects on duration estimates ranged from 0.40 to 1.60. Conclusion: The findings, which partially support a contextual-change interpretation, suggest that factors, such as perceived exertion and task familiarity, affect retrospective duration estimates.

Effects of display curvature and task duration on proofreading performance, visual discomfort, visual fatigue, mental workload, and user satisfaction

2019 ◽  
Vol 78 ◽  
pp. 26-36 ◽  
Author(s):  
Sungryul Park ◽  
Gyouhyung Kyung ◽  
Donghee Choi ◽  
Jihhyeon Yi ◽  
Songil Lee ◽  
...  
Keyword(s):  
User Satisfaction ◽  
Mental Workload ◽  
Visual Fatigue ◽  
Visual Discomfort ◽  
Task Duration ◽  
And Task

scholarly journals ELDERLY DRIVER INGRESS AND EGRESS FROM A VEHICLE: PERCEIVED DISCOMFORT AND TASK DURATION

2018 ◽  
Vol 2 (suppl_1) ◽  
pp. 517-517
Author(s):  
K Kozak ◽  
P Mirshams Shahshahani ◽  
J Wan ◽  
N Wang ◽  
A Kapshai ◽  
...  
Keyword(s):  
Task Duration ◽  
Elderly Driver ◽  
And Task

Effects of Display Curvature, Presbyopia, and Task Duration on Visual Fatigue, Task Performance, and User Satisfaction

2018 ◽  
Vol 61 (2) ◽  
pp. 273-287 ◽  
Author(s):  
Donghee Choi ◽  
Gyouhyung Kyung ◽  
Kyunghyun Nam ◽  
Sungryul Park
Keyword(s):  
Task Performance ◽  
User Satisfaction ◽  
Pupil Diameter ◽  
Visual Display ◽  
Curvature Radius ◽  
Visual Fatigue ◽  
Visual Display Terminal ◽  
Task Duration ◽  
The Mean ◽  
And Task

Objective: This study examined the effects of display curvature, presbyopia, and task duration on visual fatigue, task performance, and user satisfaction. Background: Although curved displays have been applied to diverse display products, and some studies reported their benefits, it is still unknown whether the effects of display curvature are presbyopia-specific. Method: Each of 64 individuals (eight nonpresbyopes and eight presbyopes per display curvature) performed four 15-min proofreading tasks at one display curvature radius setting (600R, 1140R, 4000R, and flat; mm). Diverse measurements were obtained to assess visual fatigue, task performance, and user satisfaction. Results: The mean pupil diameter was the largest with 1140R, indicating this curvature radius was associated with the least development of visual fatigue; 600R was comparable with 1140R in terms of pupil diameter. The presbyopic group showed a 28.5% slower proofreading speed compared with the nonpresbyopic group, whereas their proofreading accuracy was comparable. For both groups, the mean visual fatigue increased significantly during the first 15 min of proofreading, as indicated by a decrease of 0.11 mm in the mean pupil diameter, an increase of 3.8 in the mean bulbar conjunctival redness, and an increase of 9.13 in the mean eye complaint questionnaire score. Conclusion: The effect of display curvature was not presbyopia-specific. Low visual fatigue was observed with 1140R and 600R. Application: Display curvature radii near or in the range of 600R and 1140R and frequent breaks are recommended for both presbyopic and nonpresbyopic groups to reduce their visual fatigue due to visual display terminal tasks.

Design and evaluation of a feed handle for a bench drilling machine

Work ◽  
2020 ◽  
Vol 67 (2) ◽  
pp. 441-448
Author(s):  
Masood Ashraf ◽  
M. Muzammil ◽  
Abid A. Khan
Keyword(s):  
Task Performance ◽  
Performance Measures ◽  
Metal Removal ◽  
Removal Rate ◽  
Drilling Machine ◽  
Drilling Speed ◽  
Anova Analysis ◽  
Task Duration ◽  
Worker Performance ◽  
Industrial Use

BACKGROUND: Despite extensive industrial use, no major modifications to the bench drilling machine, with respect to ease of operation, have been undertaken. OBJECTIVE: The objectives of the study were to design a new feed handle (NFH) to perform the drilling task on a bench drilling machine and evaluate the existing (EFH) and new feed handles on the basis of performance measures like drilling productivity in terms of metal removal rate (MRR) and worker performance in terms of perceived discomfort score (PDS). METHODS: Participants performed the drilling task on a steel block for three different working durations at two drilling speeds. RESULTS: ANOVA analysis carried out for the MRR data showed that drilling speed had a statistically significant effect on the task performance of the operator for both handles. However, the task duration was found to be statistically significant only for the EFH. The ANOVA results obtained on the PDS data showed that the task duration and drilling speed had a statistically significant effect on the task performance of the operator for both systems. CONCLUSIONS: The MRR obtained was higher when the drilling task was carried out using NFH. An appreciable decrease in PDS was also observed using the proposed system.

Effects of Display Curvature and Task Duration on Proofreading Task Performance, Visual Fatigue, Visual Discomfort, and Display Satisfaction

2016 ◽  
Vol 60 (1) ◽  
pp. 790-794 ◽  
Author(s):  
Sungryul Park ◽  
Jihhyeon Yi ◽  
Donghee Choi ◽  
Songil Lee ◽  
Gyouhyung Kyung ◽  
...  
Keyword(s):  
Error Rate ◽  
Polynomial Regression ◽  
Viewing Distance ◽  
Visual Fatigue ◽  
Visual Discomfort ◽  
Task Duration ◽  
Two Factors ◽  
Task Durations ◽  
The Mean ◽  
And Task

With more curved display products in the market and more exposure to such products, it is necessary to examine the effects of display curvature and task duration from the ergonomics perspective. The current study examined the effects of these two factors on visual performance, visual fatigue, visual discomfort, and display satisfaction during proofreading tasks. We incorporated five display curvatures (600R, 1140R, 2000R, 4000R, and flat) and five task durations (0, 15, 30, 45, and 60 min). Each of 50 individuals completed a 1-hr proofreading task at one of five display curvature conditions. The horizontal viewing distance was fixed at 600mm. Proofreading performance (speed and error rate), subjective visual fatigue [on ECQ (Eye Complaint Questionnaire)], physiological visual fatigue [CFF (Critical Fusion Frequency), blink duration, and blink frequency], visual discomfort (on VAS), and display satisfaction (on VAS) were measured. The highest mean proofreading speed was at 600R. The mean proofreading speed and error rate increased by 15.5% and 22.3%, respectively, over the 1-h task. The mean ECQ score and visual discomfort increased by 188.6% and 107.2% during 45 and 60 min of the task, respectively. The mean CFF and display satisfaction decreased by 0.49Hz and 11.2% during 15 and 15-45 min of the task. A polynomial regression model for subjective visual fatigue was developed (adjusted R2 = 0.6). These findings can be used when determining ergonomic display curvatures and predicting visual fatigue.

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