Showing 6 results for Computer
Ghasem Hesam, Mohsen Aliabadi, Maryam Farhadian, Vahid Afshari Doust,
Volume 1, Issue 2 (12-2013)
Abstract
Background: The use of visual monitors especially in relation to computer can cause health effects which have negative impacts on mental and physical performance of users. This study aims to determine the relation between ergonomic conditions in use of visual monitors and subjective feeling of fatigue in master science students as permanent users.
Methods: In this study, 40 students in the Hamadan University of Medical Scienceswere selected based onsimplerandomapproach. For determining subjective feeling of fatigue, the standard questionnaire with reliability coefficient equal to 0.8 was distributed and completed among students. This questionnaire has 30 questions which was covered three criteria included drowsiness, difficulty of concentration and physical impairment. The data about environmental and ergonomic conditions of the workstations was also recorded. Exposure to electromagnetic radiation in very low frequency was measured using instrument model HI 3603 front of the studied monitors. Data was analyzed with SPSS 16 software.
Results: The results showed mean score of drowsiness, difficulty of concentration and physical impairment were 17.8±6.5, 18.7±4.4 and 11.9±6.9, respectively. Totally, mean score feeling of fatigue was 48.5±15.7. The relation between continuous work time and feeling of fatigue was significant (P<0.05).The relation between work day time and feeling of fatigue was not significant (P>0.05). The relation between type of used monitor and feeling of fatigue was significant (P<0.05). Moreover, the relation between environmental conditions of the workstations and feeling of fatigue was not significant (P>0.05). However, descriptive results showed growing trend of feeling of fatigue in unsuitable environmental and ergonomic conditions. Moreover, exposure to electromagnetic radiation between to type monitors was statistically difference (P<0.05).
Conclusion: Criterion of difficulty of concentration was allocated the maximum score of feeling of fatigue which can cause negative impacts on educational performance. Compliance with the ergonomic principles especially reduction continuous work time and use of updated monitors and optimization of lighting and acoustic conditions of the workstations can reduce feeling of fatigue among students, considerably.
Aram Tirgar, Zahra Aghalari, Fatemeh Salari,
Volume 1, Issue 3 (3-2014)
Abstract
Introduction:
Musculoskeletal disorders (MSDs) are common consequences of poor working
conditions associated with computer use. Regarding the lack of information
about MSDs and the extensive use of computer among the university students in
our country, this study aimed to explore the awareness level of ergonomic
considerations in computer use and the prevalence of MSDs among university
students.
Materials
and Methods: This cross-sectional study was conducted on 450 students
of three faculties of medicine, dentistry and paramedical of Babol University
of Medical Sciences in 2012. The subjects were selected by simple sampling
method. The data were gathered by the researcher-made questionnaire consisting
of 6 open and 10 closed questions. Data processing was performed by using
descriptive statistics and chi-square test. Results: The mean
(SD) age of students was 21.7 (2.5) years, 64% were females and 67% were
undergraduate students. Ninety percent of the students had personal computer
and 48% had spent 1 hour or more on their computer daily. It has been reported
that approximately 55% of students had suffered from MSDs and less than 10% of
them had been familiar with ergonomic considerations in computer use.
Chi-square test indicated a significant difference in the incidence of MSDs in
terms of the duration of working with computer (p<0.05).
Conclusion: The complaints
of MSDs in about half of the students and the lack of awareness of ergonomic
considerations in most of them suggest the possibility of increasing future
problems. Therefore, regarding the inclination of most students in receiving
information and their influential role in the dissemination of knowledge,
performing interventional programs including education in computer ergonomic
principles is recommended.
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Mansour Ziaei, Hamed Yarmohammadi, Meisam Moradi, Faramarz Gharagozlou,
Volume 1, Issue 3 (3-2014)
Abstract
Introduction: Working with Visual Display Terminals (VDTs) can be associated with visual complaints particularly visual fatigue and symptoms including headache, disruption in continuing the work and ocular disorders. The objective of the present study was to determine the prevalence of visual fatigue and its related risk factors in computer users of Kermanshah University of Medical Sciences in 2013.
Materials and Methods: This descriptive-analytical study was achieved on 260 computer users. The data were collected by Visual Fatigue, demographic and job questionnaires. For data analysis, Spearman, Mann-Whitney and Kruskal-Wallis tests were used.
Results: The mean (SD) age of the users was 36.74 (7.74) and daily working time with VDTs was 5.85 (2.28) hours. Visual fatigue score was 2.99 (1.97), so that 32.3% of computer users had severe eye fatigue. Meanwhile, 45.4, 21.9, 32.7 and 46.2 percentage of users suffered severely from eye strain, visual impairment, eye-surface disorder and extra-ocular problems. Visual fatigue incidence and its compliments were significantly increased with increasing of age, work experience and daily working hours with computer (p<0.05). Visual fatigue was higher in users wearing glasses than those not wearing glasses (p<0.001) and was lower in monitor to window angle of 90º than two other monitor to window positions of 0º (p=0.041) and 180º (p=0.036).
Conclusion: The prevalence of visual fatigue among computer users was very high. Visual fatigue and its serious consequences can be prevented by applying the principles of ergonomics such as regular and short breaks, looking at distant objects, blinking regularly and reducing the direct and indirect glares.
Athena Rafieepour, Elnaz Rafieepour, Marzieh Sadeghian,
Volume 3, Issue 1 (6-2015)
Abstract
Introduction:
Musculoskeletal disorders are one of the leading problems among computer users.
They have attracted increasing attention over years and different solutions
have been proposed for their resolution. This study evaluated the effects of ergonomic
training on reducing the risk of musculoskeletal disorders in computer users.
Materials and Methods: This study was conducted
among the office workers of a university. A total of 110 computer operators
were randomly selected and allocated to intervention and control groups. The
intervention group was trained about the ergonomic principles of working with
computers. Nordic
Musculoskeletal Questionnaire (NMQ) was used to investigate the prevalence of musculoskeletal
disorders. Moreover,
rapid upper limb assessment (RULA) was applied to determine the risk of
musculoskeletal disorders before and six months after training. Data was analyzed using independent
and paired t-test.
Results: The
highest frequency of
musculoskeletal disorders was seen in the back (55.4%) and neck (54.5%). In
addition, risk assessment before the intervention suggested 31% of the
participants to be high-risk. After the training program, significantly lower
risk was detected in the intervention group. No such a significant difference
was present in the control group.
Conclusion: The
results of this study showed that corrective actions can reduce the risk of
work-related musculoskeletal disorders (WMSDs).
They can thus be implemented to enhance
the effectiveness of ergonomic measures.
Mehdi Omidi, Amin Asgharzadeh, Seifollah Gharib, Mohsen Vahedi, Amir Salar Jafarpisheh,
Volume 8, Issue 4 (1-2021)
Abstract
Background and Objectives: The proliferation of computers, along with the development of software and the Internet, has revolutionized the work and life of people with disabilities, including those with spinal cord injuries with limited mobility in the arms. The efficiency and usability of the aids provided to these people is very important; because they have more limitations than ordinary people. The purpose of this study was to compare the efficiency and usability of human-computer interface in cervical spinal cord injury with two biofeedback EMG methods based on computer games and without computer games.
Methods: The sample size was 20 participants (healthy and with spinal cervical lesions) who were selected regarding availability. The statistical population of the study (that was conducted 2019-2020) was spinal cord injury patients referred to spinal cord injury clinic in Tehran. Participants received three 30-minute sessions per week for 1 month of EMG biofeedback training and game-based biofeedback interventions. SPSS version 23 was used for data analysis.
Results: Results showed that participants considered using EMG biofeedback and game biofeedback as 75/8% and 72/0% usability. Over time, the “through put” numerical values of the variable decreased in healthy individuals and spinal cord injury. Also, the numerical values of this variable were lower in healthy individuals than in individuals with spinal cord injuries. The maximum reduction in numerical values of the “through put” variable appeared between the first and sixth sessions.
Conclusion: The EMG and gaming biofeedback system can be used for interaction and control such as computers, wheelchairs, and more.
Siavash Etemadinezhad, Elahe Amouzadeh, Jamshid Yazdani Charati,
Volume 10, Issue 1 (7-2022)
Abstract
Objectives: Today, many hardware and software products, including office automation software, and web-based websites are used by employees, including professors and employees of different departments in offices. Websites are considered one of the main competitive advantages in any organization. This study aims to investigate the usability of the Integrated Research Automation System (SYAT): A Heuristic Evaluation.
Methods: The present study was a descriptive- cross- sectional study with a heuristic evaluation performed on the integrated research system software (SYAT) by 3 evaluators. They then evaluated the intensity of each of the ten options and scored from 0 to 4. After each problem was classified as one of the 10 branches of Nielsen's evaluation by the evaluators, similar problems were eliminated and the average scores and the severity of the deterioration of the problems were calculated.
Results: A total of 92 usability problems were identified in evaluating the usability of the web-based software (system) using the components provided by Nielsen. The majority of the issues were related to the detection instead of reminder with 16 problems (17.32%). The lowest number of problems was related to both compatibilities between the system and the real world, and the clarity of the system status with 6 cases (6.52%).
Conclusion: The usability assessment method is inexpensive and simple and the problems caused by websites and applications can be evaluated as feedback to improve them. The more accurate the needs of SYAT system users are, the more effective the system will be and the more satisfied the users will be.
