Showing 5 results for Alimohammad
Mahnaz Shakerian, Dr Alireza Choobineh, Dr Mehdi Jahangiri, Dr Moslem Alimohammadlou, Dr Mohammad Nami,
Volume 6, Issue 4 ( Iranian Journal of Ergonomics 2019)
Abstract
Background and Objectives: The recognition of a system failure causes and their related factors are considered as the most important factor in preventing accident occurrence in different organizations including industries. Human error is a known important factor in unpredictable events of which cognitive factors are the most influential ones. The purpose of this study was to introduce a new model for individual cognitive factors influencing human error as well as determining the interactions between the factors and their intensity using DEMATEL approach.
Methods: First a qualitative study was performed in order to identify and elicit the individual cognitive factors influencing human error among the workers of different industries. To ensure the adequacy and comprehensiveness of the elicited factors, then, the experts’ opinion was applied. DEMATEL method was used for understanding the interactions among the individual cognitive factors influencing human error. Finally, using these relationships, a new model of the study was proposed.
Results: Calculating D-R and D+R relating to the factors in terms of being cause or effect factor, D-R was -1.213 for C5 as the highest negative value, and D+R was 2.294 for the same factor (C5). Also, threshold level was calculated as 0.087 in the current study
Conclusion: In this study, the factors of failure in problem solving and decision making (C5) and difficulty in predicting possible hazards in the workplace are effects and the other factors were the cause factors. The factor of C5 was the highest interactive factor.
Iraj Alimohammad, Reza Pourbabaki, Kazem Rahmani, Mehrdad Souri, Fakhradin Ahmadi Kanrash,
Volume 7, Issue 1 (Iranian Journal of Ergonomics 2019)
Abstract
Background and Objectives: Studies have shown the effect of smoking on mental and cognitive performance of the individuals who need to concentrate on their work. The present study aimed to investigate the effect of smoking on cognitive performance of the automotive industry workers.
Methods: In this case-control study conducted in 2018, 280 automotive industry workers were selected through the simple random sampling and then assigned to two groups of smokers (100 cases) and non-smokers (180 controls). All the subjects were selected from the environments with the sound levels of 82 to 88 dB. The workers’ cognitive performance was also tested using the CPT, Stroop and Tower of London tests.
Results: The mean age of the case group was 36/02 (3/7) and that of the control group was 36/25 (3/65) years. The results showed that the scores of the TOL test in the case group (smokers) were lower than those of the non-smokers (OR=0/903, P<0.01), and other items of the TOL test had no significant relationship with the individuals’ smoking status (P>0/05). The Stroop and continuous performance tests also had a significant relationship with the individuals’ smoking status in terms of the number of correct responses and the response time as well as interference (P<0.01). Other items had no relationship with the individuals’ smoking status (P>0/05).
Conclusion: The results of this study showed that the use of cigarettes and nicotine substances significantly decreased the workers’ mental and intellectual performance, and smokers were more likely to suffer from concentration interference, low brain processing speed in decision-making, and low precision at work, compared to non-smokers.
Fakhradin Ahmadi Kanrash, Iraj Alimohammad, Jamileh Abolaghasemi, Kazem Rahmani,
Volume 7, Issue 1 (Iranian Journal of Ergonomics 2019)
Abstract
Background and Objectives: Noise pollution is one of the most harmful physical factors in working environments in developed and developing countries, which has significant impacts on the workers’ quality of life. The aim of this study was to investigate mental and physiological effects of chronic exposure to noise.
Methods: This is a cross-sectional study carried out randomly in 2018 on 250 workers in the automotive Industry. To measure the subjects’ aggression and annoyance levels, the Buss and Perry’s Aggression Questionnaire was used as well as an annoyance questionnaire. In this study, blood pressure measurement was also done using ALPK2 mercuric pressure gauge.
Results: The results showed that there was a significant difference in the systolic and diastolic blood pressure and noise annoyance in the groups with a lower-than-85 and higher-than-85 dB sound pressure levels (P<0.001). Besides, the results of multivariate regression showed that the annoyance level and sound pressure level had a significant relationship with the workers’ blood pressure (P<0.01). Also, there was a significant correlation between aggression components and sound pressure level (P<0.01).
Conclusion: The results of this study clearly showed that chronic exposure to noise in work environments was associated with psychological and physiological changes, such as increased blood pressure and aggression levels. Hence, implementation of preventive programs can help reduce the incidence of the psychological and physiological disorders.
Iraj Alimohammadi, Shahram Vosoughi, Jamileh Abolghasemi, Athena Rafieepour, Seyed Hosein Tabatabaei, Batool Delshadi,
Volume 10, Issue 2 (Iranian Journal of Ergonomics 2022)
Abstract
Objectives: Inappropriate sitting posture on bench can contribute to pain and musculoskeletal disorders in students. Hearing and vision disabilities may be the cause of inappropriate sitting postures among students. Therefore, the aim of the present study was to compare the risk of musculoskeletal disorders in normal and students with hearing abnormalities in Ilam city.
Methods: Twenty students with hearing abnormalities (case) and 40 students with normal hearing (control) from primary schools in Ilam city of both genders were randomly included in the study. The worst recorded sitting posture of students on the bench was evaluated by the RULA method. Digimizer software was used to survey the body angles of the students while sitting on the bench. The used for analyzing the obtained data in 95% confidence interval.
Results: The results of posture evaluation showed that there was a significant difference in rula scores between case and control groups (P = 0.001). Deviation from the natural angles of the body in the case groups was more than the control group (P < 0.001), which has a direct and significant relationship with the increased risk of musculoskeletal disorders.
Conclusion: Musculoskeletal disorders possibility incidence were more common in students with hearing abnormalities compared to typical students which was due to an increase in deviation from the natural angles of the body and inappropriate postures. Given the limitation of the sample size, the present study recommends further research with the same goal and encourages interventional studies to correct the posture of hard of hearing students.
Hamed Yarmohammadi, Mahdi Jahangiri, Moslem Alimohammadlou, Fateme Rahmati,
Volume 10, Issue 3 (Iranian Journal of Ergonomics 2022)
Abstract
Objectives: Planning and scientific policy making is required for the investigation of scientific productions. Scientific productions are published through universities and research centers in the form of articles and research journals. Scientometric approaches are a tool to assess the performance of journals in different fields. The aim of the present study was to investigate the activity of ergonomics journal.
Methods: The current research was a practical objective with the descriptive data collection method, which was conducted with a scientometric approach. The research population consists of all the articles published in ergonomics journal during the years 1392 to 1401. Publish or Perish, Vosviewer and Excel software were used to collect and analyze data.
Results: A total of 296 articles from 724 authors have been published in Ergonomics journal during a 10-year period. The most articles published belonged to Hamadan, Shiraz, Tehran and Shahid Beheshti universities of medical sciences. The most effective authors in this journal were Rashid Heydari Moghadam (with 21 articles), Majid Motamedzadeh (with 20 articles), and Alireza Chubineh (with 15 articles). The most frequently used keywords were skeletal and muscular disorders with a frequency of 39, ergonomics 37 and anthropometrics 15.
Conclusion: According to the results, the number of citations of articles in this journal was at a low level. Therefore, it is suggested to increase the amount of international participation in order to index the journal in international citation databases and increase the citation rate of articles and the visibility of the journal.
