OPERATOR’S TRUST IN EQUIPMENT IN THE SPACE OF SUBJECTIVE PROFESSIONAL WELL-BEING

Background. The relevance of the study is determined by the search for the determinants of the subjective professional well-being of operators. Possibilities of operators’ trust in equipment for achieving subjective professional well-being (SPWB) are considered. Objective. The analysis of the features of manifestation of operators’ trust in equipment as a psychological resource of subjective professional well-being was carried out. Design. The author’s questionnaire “Trust of the specialist to equipment (TSE)” was used to diagnose the level of trust of operators in equipment. Questionnaires: “Social and professional demand for personality”, “Methods for assessing professional well-being”, “Dominant state”, “Passionate about work” were used to diagnose SPWB. Empirical data were translated into z-scores. Z-scores were subjected to multidimensional scaling (non-metric scaling, distance function — Euclidean distance). The results were displayed in the form of two-dimensional graphic models of the psychological space of SPWB. In the SPWB space, assessments of indicators of operators’ trust in equipment and subjective professional well-being were reflected. Research sample. The study involved 76 NPP operators (specialists), 100 locomotive driver — a total of 176 people. Work experience — from 1 to 35 years. Results. The level of trust in the equipment among specialists is higher than among the locomotive drivers — 75.8 points and 62.4 points, respectively (p < 0,001). Experts’ assessments of indicators of trust in the equipment are located on the border of the SPWB space, far from the assessments of SPWB indicators. For locomotive drivers, assessments of indicators of trust in the equipment are located within the SPWB space next to 4 indicators of the SPWB. They reflected the desire for professional growth, satisfaction with the level of competence and professional achievements, the state of passion for work. Conclusions.The trust of specialists in the equipment becomes a psychological resource of subjective professional well-being in critical working situations. The trust of locomotive drivers in the equipment is a constant psychological resource for maintaining subjective professional well-being.

FUZZY RENEWAL THEORY ABOUT FORECASTING MISTAKES DONE BY A LOCOMOTIVE DRIVER: A SERBIAN RAILWAY CASE STUDY

The human factor is one of the most dominant causes of railway accidents. For example, human impact appears to be the main reason for 44% of railway accidents in the Republic of Serbia. Thus, a remarkable effort is undertaken to investigate human factors. Therefore, plenty of researchers have analyzed a human influence on railway accidents. This paper develops a model for forecasting the number of railway accidents caused by the human factor. The proposed model is based on the renewal theory and assumes that working time between the faults of a locomotive driver has exponential distribution (or another Erlang distribution of a higher order) characterized by parameter λ that is treated as a fuzzy dependant variable and considered as a function of job complexity, the exposure of locomotive drivers (i.e. time spent in driving) and a tendency of locomotive drivers to make mistakes. The application of the model to the population of 777 Serbian railway locomotive drivers provided encouraging results in predicting the number of railway accidents.