Showing 11 results for Control
Gholamabbas Shirali, Afshin Dibeh Khosravi, Taher Hosseinzadeh, Asad Fathi, Masood Hame Rezaee, Mostafa Hamzeiyan Ziariani,
Volume 2, Issue 3 (12-2014)
Abstract
Introduction: In many
sensitive and sophisticated workplaces, human errors are very important. Many
events occur annually around the world is evidence to confirm error due to the
data processing operators. The main goal of this study was to investigate human
information processing models and workload demands on human operators, then
developing a regression model for this purpose.
Material and Methods: This was a case study. Task analysis of control room
members, including shift supervisor, board man, and site man and user
instrumentation in this study was investigated. Data collection was performed
by interviewing employees using a questionnaire with two parts the first part
was the model of human information processing and the second part was workload
NASA–TLX and an appendix of opinions existing staffing level and finally task
analysis performed using SPSS 16 – SPSS.
Results: There was a correlation between workload and stages of
human information processing model such as perception )r=0.65, p<0.01), vocal response (r=0.45, p<0.01)
and manual response (r=0.15, p<0.05). Some effective factors on workload
were vocal response (β=0.232, p=0.033) and perception (β=0.576, p=0.00). The
most important factors in the analysis of anticipation staffing demand were
perception (β=2.514, p=0.008), workload (β=1.57, p=0.018) and vocal responses
(β=2.428, p=0.01), respectively.
Discussion and Conclusion: Increasing
concentration and attention and perception skills using psychological measures
including decreasing the workload and stress and holding specialized training
courses are necessary.
Abdollah Vahedi, Sara Dehnavi,
Volume 2, Issue 3 (12-2014)
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.
Mostafa Barzideh, Alireza Choobineh, Hamidreza Tabatabaee,
Volume 3, Issue 3 (12-2015)
Abstract
Introduction: There is a dearth of information available on psychological job demands and control in the job (decision latitude) and their relationship with musculoskeletal disorders (MSDs) among Iranian nurses. The present study was conducted to investigate psychological job demands and control in the job and their relationship with the prevalence of MSD symptoms among nurses in hospitals affiliated with Shiraz University of Medical Sciences (SUMS).
Materials and Methods: The present cross-sectional study was conducted on 385 nurses at SUMS hospitals selected through systematic random sampling. Data were collected using the Persian version of the Job Content Questionnaire (P-JCQ), the standardized Nordic Musculoskeletal Questionnaire (NMQ) and a demographic questionnaire. The data obtained were then analyzed in SPSS-11.5 using descriptive statistics and logistic regression.
Results: The mean (SD) of the different dimensions of psychological job demands and control in the job were calculated as 38.19 (5.14) and 58.15 (6.50). The results revealed psychological job demands to be high and control in the job to be low. A total of 29.1% of the nurses suffered from a high job strain (a high demand and low control). Regression modeling showed that the chance of suffering from lower extremity disorders among the nurses placed in the cells indicating a high job strain cell was 2.35 times higher than those placed in the cells indicating a low job strain.
Conclusion: The demand-control model placed the majority of the nurses in the cells indicating a high job strain. Any interventional program designed for preventing MSDs among nurses should focus on increasing their control and changing their job conditions from a high strain condition to a low strain or active one.
Mojgan Zoaktafi, Seyed Abolfazl Zakerian, Alireza Choobine, Samane Nematolahi,
Volume 4, Issue 3 (12-2016)
Abstract
Introduction: The progress of technology and modern technology has changed today’s workplaces and imposed more mental and cognitive demands to workers. Control room is an example of these workplaces. Currently, assessment of mental workload is a key point in the research and development of human-machine relationships in workplaces. This study aimed to validate an analytical approach in evaluating demanded mental workloads for control room operators in Pars combined cycle power plant.
Methods: This was a fundamental-practical and cross-sectional study. First of all, a task analysis was used to understand the operation steps of control room operators. Then, the Visual, Auditory, Cognitive, Psychomotor (VACP) technique was applied to determine the mental workload demanded for performing each step of the works. Finally, the assigned ratings of the VACP method were validated by the analysis of Pearson’s correlation with the answers of the NASA-Task Load Index (NASA-TLX) questionnaire, collected from the control room operators.
Results: Based on the results, the correlation between the assigned ratings of VACP technique and the answers of the NASA-TLX questionnaire was positive and significant.
Conclusions: Due to the high correlation between the assigned ratings of VACP technique and the answers of the NASA-TLX questionnaire, the proposed VACP technique, which can be carried out in the early stage of the design, was suitable as an analysis tool for predicting metal workloads of control room operators.
Nasim Alipour, Mehrane Shabani, Amir Asady Fakhr, Seyed Ali Mahdiyoun,
Volume 6, Issue 1 (6-2018)
Abstract
Background: The of human resources is one of the issues that management efforts have always been aimed at reducing. Many factors affect job intention to leave, one of which is job stress in a work environment. Regarding the importance of the issue, the present study was conducted to study of occupational stress as predictors of nursing intention to leave.
Methods: The research design in this study is a correlation design. The target population in this study was all nurses working in Hamedan state hospitals. Based on simple random sampling, 300 individuals were selected as the sample of this study. The instruments used in this research were effort-reward imbalance questionnaire, Job Content questionnaire, and intention to leave questionnaire. The Collected date was analyzed using correlation and regression analysis using SPSS18 software.
Results: The results showed that there is a positive and significant relationship between the amount of effort, job demands and the intention to leave in nurses (p≤0.01). But there was a negative and significant relationship between reward, job control and social support with the intention to leave in nurses (p≤0.01).
Conclusion: Based on the results, it can be concluded that job stress is an important factor in creating the intention to leave a job in the personnel, and the components of both models used in this research can be used to reduce the intention to leave at the nurses.
Fatemeh Rostami, Maryam Feiz Arefi, Amin Babaei-Pouya, Azam Ahangirimehr,
Volume 8, Issue 2 (6-2020)
Abstract
Background and Aim: Nurses are the main staff of the hospital. The large number of clients, the high volume of work and the shortage of staff increase the mental workload of nurses. On the other hand, reducing the control of the work process leads to mental stress. The purpose of this study was to investigate the mediating role of job control and explaining the relationship between job satisfaction and mental workload in nurses.
Methods: This descriptive-analytical study was performed on 188 nurses of educational hospitals in Shushtar and Ardabil cities, Iran, in 2019. Research tools included demographic information questionnaire, NASA-TLX questionnaire, Job description index (JDI) questionnaire, and job control questionnaire. For Data analysis the correlation coefficient and regression analysis with SPSS-18 and AMOS-18 software were used.
Results: Based on the results, the final model had good fitness (GFI=0.859, CFI=0.921, RMSEA=0.067). The results also showed that there is a significant relationship between mental workload and job satisfaction (P<0.001, r=-0.33) and this relationship has increased with the presence of job control (P<0.001, r=-0.42).
Conclusion: High levels of job control are associated with increased job satisfaction and reduced workload. As a result, in order to reduce the mental workload and increase job satisfaction, job control of nurses can be increased to improve working conditions.
Alireza Aghighi, Mahdi Rezaeetale, Ali Lahotian, Saied Shahabinia,
Volume 8, Issue 3 (10-2020)
Abstract
Background and Aim: The present study seeks to explain the effect of organizational change on employees' mental health with respect to the moderating role of job support and control.
Method: This method is descriptive and correlational. The statistical population of the study was the staff of Farshchian Sina Hospital in Hamadan, a total number of 200 people. Sample size was determined based on Morgan table to be 132 people which were randomly selected. Standard questionnaires of organizational change, general health, job support and job control were used to measure the variables. Data analysis was performed using SPSS software version 23 and smart SPLS version 2.
Results: Findings indicate that 43% of employees' mental health changes are explained by organizational change. Organizational change, considering the moderating effect of job support, has a positive effect on employees' mental health. The standardized coefficient between the two variables shows that 24% of mental health changes are explained by organizational change, taking into account the adjustment effect of job support. Organizational change, considering the moderating effect of job control, also has a positive effect on the mental health of employees. The standardized coefficient between the two variables also shows that 29% of mental health changes are explained by organizational change by considering the moderating effect of job control. Therefore, organizational change has a positive effect on the mental health of Farshchian Hospital staff in Hamadan.
Conclusion: The results of the research indicate that making organizational changes in Farshchian Hospital in Hamadan, considering the supportive role and control of managers, improves the mental health of employees.
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.
Hadi Miri, Seyed Sadraldin Shojaaldin, Amirhosein Barati, Maliheh Hadadnejad, Shahram Ahanjan,
Volume 10, Issue 1 (7-2022)
Abstract
Objectives: Ankle sprain leads to a decrease in proprioception and awareness of the sense of motion with motor consequences. On the other hand, damage to this joint is an important factor in affecting balance and consequently re-injury. Strengthening the factors that help maintain balance and posture, can be a basic strategy in the treatment of balance and postural problems, as well as injuries.
Methods: In this quasi-experimental study, 30 patients with chronic ankle instability were randomly divided into experimental and control groups. Both groups were pre-tested and the experimental group performed core stability exercises against gravity for six weeks. Post-test was taken again from both groups. Data were analyzed using one-way analysis of covariance. Statistical operations were performed at a significant level of α ≤ 0.05.
Results: Postural control index in the experimental group was higher in the first position and lower than the other in the sixth position. The mean of the postural control index in the experimental group was significant compared to the control group (α ≤ 0.05).
Conclusion: Performing exercises for core stability or training on unstable surfaces deploying sensory receptors is likely to cause the muscles to be more actively involved and the central nervous system to receive more appropriate and effective stimuli from the nerves of different sensory receptors, and thus this exercises improve postural stability.
Ali Afshari,
Volume 12, Issue 3 (12-2024)
Abstract
Objectives: Job satisfaction is one of the most basic components of mental health, dynamism, efficiency, and creativity of employees in any job or profession. The present study aimed to determine the relationship between self-efficacy, self-regulation, and locus of control with job satisfaction in rotating shift employees of Imam Khomeini Hospital in Urmia.
Methods: The research method is correlational. The statistical population in this study included all male employees working rotating shifts at Imam Khomeini Hospital in Urmia, 150 of whom were selected as a sample based on the stratified random sampling method according to the Morgan table. This study used the Hoffman and Kashdan Emotional Self-Regulation Questionnaire, the Scherrer Self-Efficacy Questionnaire, the Rutter Locus of Control Test, and the Smith, Kendall, and Hewlett Job Satisfaction Questionnaire as data collection tools. Pearson correlation analysis and multiple regression analysis with SPSS25 were used to analyze the hypotheses.
Results: The study showed that there was a relationship between self-efficacy and job satisfaction (0.001). There is also a positive relationship between self-regulation and job satisfaction and locus of control with job satisfaction (0.001). In the components of emotional self-regulation, the relationship of all three elements of concealment, compromise, and tolerance with job satisfaction was confirmed (0.001).
Conclusion: In short, self-efficacy, self-regulation, and internal locus of control are three important factors in determining the level of job satisfaction of employees. Cultivating these characteristics in people can help increase job satisfaction and, as a result, improve the performance and productivity of organizations.
Majid Shahbazi, Javad Sarrafzadeh, Saeed Akhlaghi, Hossein Negahban,
Volume 12, Issue 4 (2-2025)
Abstract
Objectives: Balance control is a crucial issue in patients with low back pain. Despite existing studies, the mechanism of balance control in patients with low back pain, especially under different loading conditions at various heights, remains unclear. Therefore, this study aimed to investigate the effect of height on balance during loading.
Methods: In this cross-sectional study, 54 low back pain patients and 20 healthy male individuals participated. Balance control was assessed using a force plate system. The participants were randomly instructed to lower the load from above the head to waist level and from waist level to the ground. The load was approximately 10% of the participants' body weight. The P value was established 5% level of significance.
Results: The results showed that during lifting from above the head to waist level and from waist level to the ground, there were significant differences (P<0.05) in variables such as medial-lateral and anterior-posterior velocity, total mean velocity, and center of pressure displacement in the anterior-posterior direction between the two groups. Intra-group comparisons of variables in healthy individuals and low back pain patients indicated significant differences (P<0.05) in all variables except anterior-posterior velocity in healthy individuals. Both groups exhibited increased postural sway while lowering at a lower height.
Conclusion: The present study demonstrates that both healthy individuals and low back pain patients display less balance when loading at a lower height with a flexed lumbar spine, indicating that considering these findings could contribute to rehabilitation, determining occupational conditions, and preventing workplace-related accidents.
