Showing 7 results for Karimi
Rostam Golmohammadi, Mojtaba Kamalinia, Kamalodin Abedi, Sara Karimi, Mahbubeh Eshaghi,
Volume 2, Issue 1 (Journal of Ergonomics 2014)
Abstract
Introduction: Many calls already perform by cell phones that have need to radiation exposure by users. Because of health reasons and some doubts about effects, this study was conducted to determine the extent of the mobile phones radiations and self report symptoms of users.
Material and Method: In this cross-sectional study, 80 available randomly users contain students and staffs of Hamadan University of medical sciences in 2012 were selected. Electro Smog meter TES-593 was used as radiation measurements tool. In order to assess health effects of mobile phones’ radiation, a self-administered survey questionnaire were used. Statistical analyses were performed using T-test, ANOVA and X2 tests by SPSS 11.5.
Results: Results showed that the conversation mode had a highest level of electromagnetic indices in the studied cell phones. Compare means of power density that emitted from studied mobile phones had significantly difference (P=0.001). Relationship between exposure to the mobile phones radiation by symptoms of head-ache, anxiety and sleep disturb were significant (P=0.02, P=0.03, and P=0.002 respectively).
Conclusion: Although, there is founding the relations between exposure to cell phones electromagnetic fields and some self-reported symptoms in line with same reports, These symptoms can not be absolutely attributed to the use of mobile phones. With these considerations it is recommended that for prevention of health risks from cell phones, safe type selection, control of call duration and frequency of use of these devices should be mentioned.
Rashid Heydari Moghadam, Majid Motamedzade, Mohammad Babamiri, Qhodratolah Roshanayi, Shiva Rastegari Yekta, Eghbal Zandkarimi,
Volume 4, Issue 3 (Journal of Ergonomics 2016)
Abstract
Introduction: Varicose veins in the lower limbs commonly occur in the general population and can negatively affect their quality of life. One of the high-risk jobs is the field hairdressers. The aim of this study was to investigate the effects of ergonomic interventions on quality of life of female hairdressers suffering from diseases in the lower extremities varicose veins.
Methods: The study population was all female hairdressers of Hamadan Mahdieh clinic who were referred for medical examinations. Using simple random sampling method, 70 patients suffering from varicose disease were chosen and were classified to case and control groups. The intervention included an exercise protocol for the cases with varicose disease. The present study was quasi-experimental with pre-test and post-test and participants responded to Aberdeen varicose veins, chronic pain and muscle fatigue questionnaires, which were considered as indicators of quality of working life. Data was analyzed by paired sample t-test using of SPSS 16.
Results: The results showed that ergonomic interventions were effective on the rate of varicose score, pain and swelling score as well as the score of muscle fatigue of left and right lower limbs in the case group. The average scores of varicose veins, pain and swelling, and left and right lower extremity muscle fatigue in the case group decreased respectively 2.66, 2.4, 0.75 and 1.2.
Conclusions: With regard to the impact of exercise protocol on quality of working life in hairdresserd, the use of this protocol is recommended in patients with varicose veins disease.
Mohammad Babamiri, Fakhradin Ghasemi, Rashid Heidari Moghadam, Jjalil Derakhshan, Mahnoush Karimi,
Volume 5, Issue 4 (Journal of Ergonomics 2018)
Abstract
Background: “Participatory ergonomics” is defined as an active participation of all members of the organization in the development and implementation of ergonomic knowledge in order to improve the working environment, quality, productivity and safety of the organization. The purpose of this study was to determine the appropriate process of working condition with the participatory ergonomic approach and its impact on one of the printing industries.
Methods: This research is an interventional study carried out in one printing industry center. To identify the ergonomic risk factors the “Nordic Questionnaire" and “Ergonomic Review Points” and to evaluate the quality employees’ working life, the NIOSH modified quality of life curriculum was used. The results were by conducting a paired t-test using SPSS20 software package.
Results: The investigation of health, and working conditions using the supplementary checklist before and after applying the review points with participatory ergonomic approach shows a significant increase. Data analysis using the paired t-test showed a significant improvement in quality of working life and reduction of musculoskeletal disorders after intervention (P <0.001).
Conclusion: According to the results, it can be concluded that the individuals’ social skills and abilities have increased by participation in the process of participatory ergonomics. Increasing the quality of working life has a significant role to improve the health of workers and reduce occupational accidents. Therefore, the implementation of participatory ergonomic program with the collaboration of industrial managers can be an effective step towards achieving human resource satisfaction and health.
Mehdi Ganji, Milad Karimi, Behnoush Bahari,
Volume 6, Issue 4 ( Iranian Journal of Ergonomics 2019)
Abstract
Background and Objectives: Due to the necessity of the proper driver packaging, setting parameters for the driver to achieve the highest ergonomics of the driver has a great importance. The range of variations in some parameters of the package is wide, and the correct selection of the packaging parameters until to achieve driver’s ergonomics position, requires some tests.
Methods: In this study, using the MINITAB16 software and using these parameters, several driving simulation were performed using the DHM (Digital human modeling) and DOE (Design of experiment) tools. Hence, for the C segment vehicles, the range of all driver’s package parameters, such as seat height, steering angle etc., was extracted using the A2MAC1 site, and was considered as the basis for the input parameter. According to the proposed tests by MINITAB16 software, the driver’s comfort level was evaluated based on the PORTER (1998) criteria.
Results: The seat height and also vertical and horizontal distances of the steering wheel to the accelerator heel point have the greatest impact on the driver’s ergonomics. Also, due to the high correlation between some of the parameters of the package and the ergonomics outputs of the body while driving, predictive equations were presented in this regard.
Conclusion: The results are the optimal model for ergonomic driving position. The most influential parameters of the driver’s package are ergonomically known and using the ANOVA (Analysis of variance), mathematical predictor models were presented.
Sedigheh Karimi Avargani, Ali Maleki, Shahin Besharati, Reza Ebrahimi,
Volume 8, Issue 3 (Iranian Journal of Ergonomics 2020)
Abstract
Background and Aim: Carriage of backpack sprayers is an inevitable part of agricultural operations that increases the risk of injury along with undesirable changes in walking mechanics. The purpose of this study is to formulate the muscle moment changes in the hip, knee and ankle for the backpack sprayer operator body.
Methods: In this study, a seven-link sprayer operator model is designed and the moment changes in the hip, knee and ankle joints are evaluated. Data are obtained using Plot-digitizer software. Excel software is used to fit the third degree curve on the data.
Results: In the hip joint, the moment is reduced by changing the angle from zero to 15°. At the end of the swing phase, the moment applied to the hip joint increases with increasing the angle up to 30°. In the beginning of the swing phase, the knee joint starts to open at -55°. At the end of the swing phase, the knee joint releases up to -5 ° and the moment applied to the knee joint increases slowly. The moment applied to the ankle joint increases by changing the ankle angle from -7.5° to 7.5°.
Conclusion: According to the results of this study, amount of moment changes of hip, knee and ankle joint affect the force applied to the backpack sprayer operator body. With the knowledge of the moment changes of joints, practical solutions can be provided to reduce amount of damage to these joints.
Davood Afshari, Maryam Nourollahi-Darabad, Noorollah Karimi, Maryam Seyed Tabib,
Volume 10, Issue 1 (Iranian Journal of Ergonomics 2022)
Abstract
Objectives: Nurses are at the front line of treatment and coping with COVID-19 pandemic. Therefore, the present study investigates the pandemic’s impact on nurses ’mental workload and determines its predictive factors.
Methods: This descriptive-analytical study was done on 234 nurses in two groups working at COVID-19 and non-COVID-19 wards in 2020. The criteria for entering the study were the absence of psychological problems. Data was gathered using the General Health Questionnaire, NASA-TLX, and Demographic Questionnaire.
Results: The mean of the overall mental workload score in the group of nurses working at the Covid-19 wards (70.09 ± 2.51) was higher than the group of nurses working in the non-COVID-19 wards (66.55 ± 2.02). This difference was significant (P = 0.01). There was a significant difference between the mean score of the mental demand, the physical demand, the temporal demand, and the frustration level of the two groups. With the exception of performance, the group of nurses working in the corona ward had a higher mean score in all aspects. In the proposed linear model, 16% of the overall changes in mental workload depended on two variables, which were age and work experience. The work experience was the most influential factor in predicting nurses' mental workload.
Conclusion: The findings of the present study showed the importance of paying attention to the mental workload of nurses as well as personal and occupational factors affecting mental workload in the conditions of the COVID-19 pandemic. Therefore, control and management of effective factors can help reduce mental workload, especially during pandemic conditions.
Milad Karimi, Mahdi Ganji, Behnoush Bahari,
Volume 12, Issue 4 (Iranian Journal of Ergonomics-In Press 2025)
Abstract
Introduction: Nowadays, using digital displays in vehicles has become very common. Therefore, the reflection display screen issue as a virtual image on the vehicle's side windows at night is a controversial item in ergonomics position of designed display. Given the high importance of visual tasks, it is necessary to take ergonomics considerations into account during vehicle design process to achieve an optimal display position.
Methods: In current study, by identifying the factors affecting the placement of the central display inside the vehicle, and assigning level values for them, using the design of experiment statistical method with the full factorial way, the 243 runs were obtained from the combination of the identified factors using MINITAB version 18 software, and by implementing all the extracted runs, the amount of reflection from the central display on the side windows was subjected to statistical analysis of variance (ANOVA).
Results: significantly effective factors (including their interaction) on the response of the reflection of the virtual image on the critical vision zone and the total reflection on the driver's right and left side windows were identified, and the amount/direction of the factors' effect on the responses were analyzed by providing a linear regression model.
Conclusion: During the interior design process of the vehicle and when display packaging, the factors identified in this study can be used as a control tool to reduce or eliminate the concern of the amount of display reflection on the side windows in order to prevent driver's ergonomics problems while nighttime driving.
