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Showing 8 results for Vahedi
Cognitive characteristics of the operator of urban traffic control center and framework of Cognitive Work Analysis (CWA)
Abdollah Vahedi, Sara Dehnavi,
Volume 2, Issue 3 (Journal of Ergonomics 2014)
Abstract
 

Introduction: As the traffic is one of the most common social troubles in big cities, widen the roads culture and using the intelligent methods are using to control the traffic. Therefore, the traffic control systems are innovated. These system operators have to do many cognitive jobs to manage these systems. CWA as a framework to improve the design of these systems has introduced in this paper to analyze them.

Material and Methods: CTA recognizes the restrictions of system throughout the 5 phases that begin with work domain analysis and ends in necessary personal qualification. Task analysis, strategy analysis and investigating the cooperation and organizations are between paces, respect.

Results: the results of this investigation consist of outline of the technique CWA, work domain analysis, decision ladders, details of relevant indicators, strategies, Information Flow Map (IFM), to frame the social organization and cooperation, and worker qualification analysis.

Conclusion: The results of this study may used in selection and training the mentioned systems operators. The main reason is to use the experienced staff with high cognitive abilities in working with these systems. Otherwise, it can result in waste the organization money and energy. The operator decision making is more dependent on the information process, the operator also needs to have higher cognitive abilities. Strong visual search, timing and problem solving are perquisites of this job opportunity.


The effects of ergonomic interventions in manual activities to reduce musculoskeletal disorders in manual activities by ManTRA
Sara Dehnavi, Abdollah Vahedi, Majid Motamedzade Torghabe, Abbas Moghimbeigi,
Volume 4, Issue 4 (Journal of Ergonomics 2017)
Abstract

Abstract:

Introduction: Work-related musculoskeletal disorders (WMSDs) occur when the pressure that applied to musculoskeletal tissue is/be more than tissue tolerant capabilities. This study aimed to assess the risk factors cause musculoskeletal disorders associated with manual tasks using ManTRA and conducted ergonomics intervention program(educational- engineering) among workers in the printing industry.

MethodS: In this interventional case-control study, 40 workers who performed manual tasks, ( 20 case group and 20 control group) were chosen and were investigated. Nordic Body Map was used to determine the intensity and position of pain in the Different part of the body.  ManTRA method was performed to evaluate cumulative scores in four regions of the body (wrist / hand / arm - shoulder / neck - back - lower limb) for each workers before and after the intervention. Data analysis was done using SPSS.

Results: Data analysis showed that mean intensity of  pain in the control group before and after intervention in the various regions of the body such as  head /neck (p=0.012), right shoulder/arm (p=0.012), left shoulder/arm(p=0.043), back (p=0.003), right hand / wrist (p=0.028), left hand / wrist (p=0.027), right knee/ hip (p=0.005), left knee/ hip (p=0.005), right leg (p=0.012) & left leg(p=0.028) were significant.Cumulative score was also significant in the body regions such as arm/wrist /hand (p=0.001) and shoulder /neck (p=0.001) before and after the interventional program.

Conclusion: On the basis of the findings of this study, it could be noted that the ergonomic interventional program was effective to reduce the intensity of pain in the various regions of the body and risk factors causing cumulative damage in the workplace.

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Examining the Effect of Smartphone on Musculoskeletal Disorders and Neck Kinematic Among Smartphone Users in Different Postures and Tasks
Zahra Vahedi, Dr Adel Mazlomi, Dr Ali Sharifnezhad, Dr Kamal Azam,
Volume 6, Issue 4 ( Iranian Journal of Ergonomics 2019)
Abstract
Background and Objectives: In the last decade, the smartphones have become one of the most popular technologies around the world. Due to the multi-functional use of smartphones, the technology users spend long hours using it.
Methods: This was a semi-experimental and experimental study. In the first section, 98 students entered the semi-experimental part and completed demographic and body map questionnaires before starting the study. They were asked to perform their duties with their phone for 20 minutes and then complete the body map questionnaire again. In the second part of this study, 12 women from the first group participated in the experimental study to assess the neck flexion using the motion capture. SPSS 24 was used for statistical analysis.
Results: Searching the Internet and sending texts were the most common tasks among the participants in this study. The use of cell phone caused an increase in pain and discomfort in the neck, shoulder, thumb, thenar. The results of the study showed that there is a significant association between sitting posture and high level of neck forward flexion. Furthermore, neck flexion increased during typing while both hands holding the handset.
Conclusion: Smartphone users have had repetitive motions in fixed postures for a long time, and these factors are thought to increase the likelihood of musculoskeletal disorders.

The Efficiency and Usability Human-Computer Interface in Cervical Spinal Cord Injury by Game-based Electromyography Biofeedback and Electromyography Biofeedback
Mehdi Omidi, Amin Asgharzadeh, Seifollah Gharib, Mohsen Vahedi, Amir Salar Jafarpisheh,
Volume 8, Issue 4 (Iranian Journal of Ergonomics 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.

Industrial Exoskeletons, Challenges and Suggestions in Ergonomic Studies
Abdollah Vahedi, Iman Dianat,
Volume 10, Issue 2 (Iranian Journal of Ergonomics 2022)
Abstract
Objectives: The challenges that have been raised today, such as changes in population structure, diverse workforce, mass production, and automation of production, indicate the need to review production systems. Classical ergonomic solutions are no longer suitable for carrying heavy loads and repetitive activities. By supporting workers to reduce physical and mental stress, human-centered assistant applications (HCAAs) should solve this problem. The technical problems of the exoskeleton have been investigated in many scientific studies, but its effect on the human user has not been paid much attention to. So, this study reviews the studies that have examined industrial exoskeletons from the ergonomic point of view
Methods: Papers concerning exoskeleton in ergonomic studies are reviewed using Scopus and PubMed databases. The selected papers were published in the reviewed journals from 2014 to 2021. Books, conference papers, and reports are not included in this study. In the present study, only official scientific journals in English are reviewed, and the references obtained from the search are screened by the title and abstract. The full text of the papers is checked if the abstract does not contain enough information. Those papers that met the inclusion criteria are listed in this review.
Results: Studies on ergonomic industrial exoskeletons account for a small share of studies on industrial exoskeletons. From 2012 to the time of conducting this study, 96 studies were found on industrial exoskeletons, of which 10.41% design or evaluate industrial exoskeletons from an ergonomic point of view. This is very small compared to the studies on exoskeleton conducted since 2012 and only about 0.4% of the studies.
Conclusion: The reviewed studies emphasize the facilitation of the successful use of exoskeletons in occupational structures by considering at least three dimensions (physical requirements, task performance, and usability), all of which can contribute to determining the potential efficiency of exoskeletons in the work environment. Due to the potential of this technology, more studies should be conducted in the future to cover some of the identified challenges and compare the exoskeleton design methods under more diverse and more realistic situations.

Comparative Study of Physical, Environmental and Psychosocial Risk Factors in Workers in the Production and Assembly of Auto Parts in Qom with a Multi-Factor Approach
Zahrasadat Javadi Hoseini, Hamidreza Mokhtarinia, Mohsen Vahedi,
Volume 10, Issue 2 (Iranian Journal of Ergonomics 2022)
Abstract
Objectives: Work-related musculoskeletal disorders are multifactorial conditions that result in time loss, disability, and increased economical costs. The aim of the current study was to evaluate the role of the physical, environmental and psychosocial factors in the development of musculoskeletal disorders in workers in the production and assembly of auto parts in Qom city in 2021.
Methods: In this cross-sectional study, 211 participants through an inconvenience sampling method entered the study. The demographic characteristics of participants and the prevalence of musculoskeletal disorders were assessed by a self-report questionnaire and the Extended Nordic questionnaire, respectively. The mental workload was evaluated by the NASA-TLX index and the physical, environmental and psychosocial risk factors were evaluated by the Structured Multidisciplinary Work Evaluation Tool (SMET). The binary logistic regression method was used to show the role of the different risk factors in the development of MSDs.
Results: Participants had an average age of 33.9 years (SD = 6.9). The lifetime prevalence of MSDs was obtained at about 77.72% in at least one area of the body. The neck, back, and shoulder areas were the most common regions. Gender, smoking history, surgery history, age, past surgery history, and sports history were most effective in the development of MSDs. In addition, subscales of mental workload play a role in causing pain in the shoulders, upper back, back and knees. SMET subscales play an effective role in the neck (OR = 1.396), upper back (OR = 1.663), hip, and knee, wrist/hand, and ankle/foot pain.
Conclusion: According to the role of various factors in developing disorders, the physical, psychosocial, and environmental factors should be considered simultaneously in planning preventive programs and ergonomics interventions.

Investigating the Relationship between Working Ability and the Prevalence of Musculoskeletal Disorders During COVID-19 Pandemic in in the Staff of Saveh Comprehensive Urban and Rural Health Service Centers
Maryam Rafiee, Farhad Tabatabai Ghomsheh, Reza Osquei Zadeh, Mohsen Vahedi, Hadi Mahmoodi Sharafe,
Volume 10, Issue 3 (Iranian Journal of Ergonomics 2022)
Abstract
Objectives: Health workers are the frontline of the fight against Coronavirus. During the Pandemic, these jobs, which had a lot of referrals, were under high work pressure, that can increase the chances of suffering from musculoskeletal disorders and affect their working ability. Therefore, this study aimed to determine the relationship between work ability and the prevalence of musculoskeletal disorders in the staff of Saveh's comprehensive urban and rural health service centers during the Corona Pandemic in 2022.
Methods: In this cross-sectional study, 197 employees of comprehensive urban and rural health service centers in Saveh city were randomly selected. The prevalence of musculoskeletal disorders and working ability were evaluated by the developed Nordic questionnaire and WAI (Work Ability Index), respectively. Data analysis was done using Pearson correlation coefficient tests and Two-way logistic regression.
Results: The average working ability of employees was equal to 34.86 ± 7.61. The most common areas involved in musculoskeletal disorders were the back (63%), neck (30%) and knees (17.8%) with the frequency of 125, 63 and 39 people, respectively. The index of working ability on musculoskeletal disorders in hip and thigh, hand and wrist, neck and back areas was significant (P ≤ 0.05). Also, the working ability was lower in cases with a history of corona virus infection (P = 0.001).
Conclusion: Considering the effect of working ability on the prevalence of musculoskeletal disorders, it is suggested that during the COVID-19 epidemic, identification of factors affecting the reduction of work ability and the implementation of ergonomic interventions should be prioritized.

Translation, Cross-cultural Adaptation, and Evaluation of Psychometric Properties of the CarMen-Q Mental Workload Questionnaire into Persian
Zahra Rafat, Hamidreza Mokhtarinia, Mohsen Vahedi,
Volume 11, Issue 4 (Iranian Journal of Ergonomics 2024)
Abstract
Objectives: Changes in mental workload are related to performance and level of fatigue, stress, human error, and job dissatisfaction. Questionnaires are simple, accessible, and valid tools for the assessment of mental workload. Therefore, the present study aimed at translation, cultural adaptation, and evaluation of psychometric properties of the Carmen-Q mental workload questionnaire.
Methods: This study was conducted on 296 subjects  (100 women and 196 men) with a mean age of 38.59±7.61 years, working in industrial and administrative sectors in several centers in Saveh. The process of translation and cultural adaptation was carried out in accordance with relevant guidelines and included the stages of forward and backward translation, synthesizing and preparing a final version, piloting, and then final approval of the Persian version. Psychometric properties, including face validity (simplicity and readability), content validity (through content validity index), convergent validity (through correlation with NASA-TLX questionnaire), and internal consistency (using Cronbach's alpha coefficient) were assessed.
Results: The translation, cultural adaptation, and face validity assessment were carried out according to related guidelines, and the text underwent some minor changes. The Content Validity Index values for each of the items and its total (0.914) were acceptable. Cronbach's alpha value was acceptable for all items (0.91) and each subscale (above 0.8). Pearson's correlation coefficient displayed a moderate to good relationship between Carmen-Q and NASA task load index.
Conclusion: The Persian version of the Carmen-Q questionnaire is a valid and reliable tool for evaluating mental workload in Iranian society.

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