Transport and mining machinery cabins' ergonomic evaluation as a path to its redesign.

Transport and mining machinery cabins are still not well adapted to their users, while checklists for their evaluation are not common in the literature. This article proposes a new checklist for ergonomic evaluation and tests its universality empirically with a sample of 96 transport and mining machine operators. The objective of the article is two-fold. First, the article checks whether there are anthropometric dimension differences between different machines' operators. Second, statistical significance testing regarding items in the proposed checklist is performed to check its universality. Significant differences have not been found between anthropometric dimensions of transport and mining machine operators. Group comparisons prove that mining machines have better ergonomics characteristics of the chair, manual controls and vision field. The recommendation for crane designers is to examine mining machines solutions and analyze the possibility of adapting these solutions, due to anthropometric fit. Wide usage of the checklist is recommended.

Influence of human factors on risk associated with pressure equipment.

Objectives. The analysis of previous research shows that indicators of human factors have not been sufficiently integrated into the models for risk assessment of pressure equipment to date. Therefore, the goal of this article is the creation of a universal measurement scale to assess the current condition of the impacts of human factors on the risk of pressure equipment exploitation in factories and plants. Methods. A research instrument with nine constructs and 61 dimensions was designed and tested on a sample size of 268 companies, by reliability, exploratory and confirmatory factor analysis. Results. The final model contains exact quantification of nine constructs described by 27 influencing human factors on risk associated with pressure equipment exploitation. Conclusions. The most influencing construct is 'communication', whereas the construct 'organizational change management' is the least influencing. Also, applying Pareto analysis shows that the most important constructs identified are 'communication', 'safety and health at work', 'potentially hazardous materials and equipment', 'maintenance/inspection', 'human error' and 'trainings and competences of employees for crisis situations'. It is a recommendation for the process industry enterprises, where pressure equipment is in operation, to include the obtained model in the risk assessment processes they are using.

Managers safety attitudes as organizational factors and pressure equipment risk predictor.

BACKGROUND: Change in current approach to develop methodologies for process risk assessment, where it is commenced from the process industry and exclusively hazardous materials are dealt with, into the approach where it will be commenced from pressure equipment within any context and both technical and organizational aspects are considered, can lead to the orientation of a more comprehensive approach to risk assessment, and thereby to better results in this area. OBJECTIVE: The goal of this study implies the creation of a universal measurement instrument that will measure and quantify organizational factors impact on the risk of pressure equipment exploitation. METHODS: The research instrument was drawn from previous research and tested by the multivariate statistical methods using the sample size of 253. RESULTS: The confirmatory factor analysis conducted shows that the most influencing organizational factor is 'subcontractors for works from other enterprises' with maximum value of 104, whereas the factors 'maintenance/inspection', 'safety and health at work' and 'human error' are by 10% to 20% less influencing. There then follow 'training and competence of employees for crisis situations', communication', 'potentially hazardous materials and equipment' and 'organizational change management' and the factor 'conducting investigation after accidents' with the lowest value of 29. Pareto analysis indicates that the factors 'communication', 'subcontractors for works from other enterprises', 'organizational changes management', 'potentially hazardous materials and equipment', and 'training and competence of employees for crisis situations' participate with 80%, and they should be given special attention in practice. CONCLUSION: The instrument offered can ensure proactive information on the influence of organizational factors as risk predictors of pressure equipment operation, before given influences lead to accidents with severe consequences.

Differences in attitudes of operators and managers on risk management of pressure equipment.

Objectives. Previous research indicates that models for risk assessment of pressure equipment have not sufficiently or adequately integrated indicators of human factors and organizational factors. Methods. The goal of this article is to check the differences in attitudes of operators and managers engaged in the area of pressure equipment risk management. A questionnaire was designed and data were then collected from 253 operators and managers working with the same pressure equipment in Serbia. By applying a paired t test, differences in their attitudes were checked for issues described by the constructs of communication (COM), potentially hazardous materials and equipment (PHME), process safety (PS), safety and health at work (SHW), organizational change management (OCM), maintenance/inspection (MI) procedures, human error (HE), trainings and competences of employees for crisis situations (TCECS) and conducting research after accidents (CRAA). Results. It is statistically evident that the coincidence of attitudes accounted for less than 20% of questions. The highest coincidence is shown for PHME and TCECS, where one-half of the dimensions of the given constructs indicate that there are no statistically significant differences. Conclusions. The differences found could be used as an explanation for high-risk levels of pressure equipment exploitation and how they influence it.

Differences in Serbian and Libyan crane operators' anthropometric measurements and cabin interior space modeling.

BACKGROUND: Previous research has shown that the collection and analysis of crane operators' anthropometric characteristics is very important for operators' comfort, health and working ability and also from the aspect of performance, productivity and safety. OBJECTIVE: The first aim of this survey is to collect up-to-date anthropometric data of crane operators in Serbia and to collect those data for the first time in Libya. The second aim of this survey is to compare the collected data. The third aim is to model the interior space necessary to accommodate operators in the cabins they operate in Serbia and Libya. METHODS: Standing height, sitting height, lower leg length, upper leg length, shoulder width, hip breadth, arm length, foot length and weight data were collected of 83 Serbian and 50 Libyan crane operators. Descriptive statistics, correlation analysis and tests for differences between variables were conducted to examine differences between Serbian and Libyan crane operators and enable further modeling. The modeling of the cabin interior was done using both univariate and multivariate operators' models from both samples. RESULTS: There are only four common correlations between variables for both samples. The only measurement without statistical differences is shoulder width. Serbian crane operators have statistically higher values of almost all measurements in comparison to Libyans. The minimal cabin interior space dimensions are 1207×1080×1884 mm for Serbian operators and 1106×1040×1790 mm for Libyan operators when using univariate approach, while multivariate approach provides more precise and comfortable accommodation within 1327×1123×1926 mm for Serbian operators and 1203×1090×1830 mm for Libyan operators. Accordingly, our survey shows that percentile models include less than the intended population proportion in the design problem with few dimensions and depends on correlations among them. CONCLUSIONS: A number of problems are solved through modeling the crane operator workspace and it has been shown that cabins with different dimensions have to be offered to Serbian and Libyan markets.

Crane cabins' interior space multivariate anthropometric modeling.

BACKGROUND: Previous research has shown that today's crane cabins fail to meet the needs of a large proportion of operators. Performance and financial losses and effects on safety should not be overlooked as well. OBJECTIVE: The first aim of this survey is to model the crane cabin interior space using up-to-date crane operator anthropometric data and to compare the multivariate and univariate method anthropometric models. The second aim of the paper is to define the crane cabin interior space dimensions that enable anthropometric convenience. METHODS: To facilitate the cabin design, the anthropometric dimensions of 64 crane operators in the first sample and 19 more in the second sample were collected in Serbia. The multivariate anthropometric models, spanning 95% of the population on the basis of a set of 8 anthropometric dimensions, have been developed. The percentile method was also used on the same set of data. RESULTS: The dimensions of the interior space, necessary for the accommodation of the crane operator, are 1174×1080×1865 mm. The percentiles results for the 5th and 95th model are within the obtained dimensions. CONCLUSIONS: The results of this study may prove useful to crane cabin designers in eliminating anthropometric inconsistencies and improving the health of operators, but can also aid in improving the safety, performance and financial results of the companies where crane cabins operate.

Workspace design for crane cabins applying a combined traditional approach and the Taguchi method for design of experiments.

Procedures in the development process of crane cabins are arbitrary and subjective. Since approximately 42% of incidents in the construction industry are linked to them, there is a need to collect fresh anthropometric data and provide additional recommendations for design. In this paper, dimensioning of the crane cabin interior space was carried out using a sample of 64 crane operators' anthropometric measurements, in the Republic of Serbia, by measuring workspace with 10 parameters using nine measured anthropometric data from each crane operator. This paper applies experiments run via full factorial designs using a combined traditional and Taguchi approach. The experiments indicated which design parameters are influenced by which anthropometric measurements and to what degree. The results are expected to be of use for crane cabin designers and should assist them to design a cabin that may lead to less strenuous sitting postures and fatigue for operators, thus improving safety and accident prevention.

Anthropometric assessment of crane cabins and recommendations for design: A case study.

BACKGROUND: Work of crane operators is very difficult and demanding. Therefore, it is very important that the cabin of a crane be designed on the basis of relevant anthropometric data. However, it is very difficult to find a research that considers anthropometric convenience of crane cabins. OBJECTIVE: From the theoretical viewpoint, it is important to perceive and to classify effects of the anthropometric incompatibility of crane cabins. Globally, the objective is to consider the anthropometric convenience of existing crane cabins, and possibilities for improvements of their design from the ergonomic point of view. In this regard, it is significant to detect constraints that impede or hinder the work of the crane operators, which could be overcome with certain anthropometric solutions. The main objective is to examine whether and to what extent is justifiable to use anthropometric data that are obtained on the basis of general (national) population, during designing the crane cabins. METHODS: For the assessment of existing crane cabins and the work of operators, four methods were used: observation of the work of the operators and design solutions of the cabins, the checklist approach, interviewing of operators and the experimental research based on obtaining the data on the population of crane operators. RESULTS: Results of the analysis based on the method of observation, analysis based on the application of the checklist, as well as interviewing of the operators indicate that certain construction constraints of the components in the cabins are the main reasons of reduced visibility and improper working postures of operators. All this has caused the emergence of continuous musculoskeletal loading of the crane operators. The results of the anthropometric research that were obtained on the population of crane operators in this case study suggest that there is a statistically significant difference, when compared data of this population of workers with anthropometric data from the general population. CONCLUSIONS: Analyzed workplaces in crane cabins do not correspond to the majority of operators from the anthropometric standpoint. The conducted anthropometric analysis has been indicated that could be made the mistake, if dimensions of the cabin and layout of equipment would be relied on data derived from the general population of citizens. In order to achieve greater precision in the design and configuration of equipment, it is recommended using the data that are obtained directly on the population of the crane operators when designing the cabin.

Minor malformations: neonatal or anthropological story?

Minor malformations (mM) are mild physical deformities that with their incidence, number and evolution may be external indicators of hidden, more serious disorders. Most often these are recognized by the neonatologists. First studies done some forty years ago showed an average incidence of 15% in the general population of newborns and about 50% in children with major malformations (MM). A study done in Maternity Hospital Mostar covering a one-year cohort of the newborns and assessing 38 mM showed an average incidence 23.7% mM in children without MM. Twelve mM have had a frequency above 1%, many of them in the head region. The most frequent specific mM was a deep sacral dimple (4.6%). Eighteen mM malformations that appeared more often were re-evaluated three months later. A large part (50-80%) disappeared, but a small number (about 17%) were newly discovered. In the newborns with MM, the incidence of mM was 57.5%. 15 of 23 children with MM (65.2%) had more than three associated mM. The highest percentage was in the group of hypotrophic newborns. The connection of mM with MM and specificity of incidence of mM in one population are the reason why the search for mM in the neonatal period could be benefit also for children and whole population.